aboutsummaryrefslogblamecommitdiffstats
path: root/src/lib/ffmpeg7/avcodec.pas
blob: b2ed9fd2bfa9330d4115f7ec7fae72a72af4e3be (plain) (tree)
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747















































                                                                                   

















































                                                                                 
                                                               



                                                   
                                                                         



































































































































































































































































































































































































                                                                           
                                  






























                                                                                                                  
 
                             
 
                                



















































































































































                                                                                                                                     
                             





















































































































































































































































                                                                                                                                            
                              







































                                                                                                                           
                       
                                                                    
        












































                                                                                   
                     















                                           
        


































































                                                                                                       
                           



                                          
        

















































































































                                                                                

                                     































































































































































































































































































                                                                                                    
                                      































                                                                                                        






















                                                                          






                                                                       
































































































                                                                                                
                     






                                                                               
        



































































































                                                                                         
                     






                                                                                                               
        


























































































































































































































































































































































































                                                                                                        
                 












                               
        




































































































































































































































                                                                                                          
                            





                                                       
        

















































                                                                                       
                           





                                                  
        
































































































































































































































































































































                                                                                                                               
                    



























                                                                  
                             


























                                                                
                             














































































































































































































                                                                                                                        
                             












                                                                             
        







































































































                                                                                          
                           


















































                                                                                                                                                 
                                                                      






                                                                                                   
                                                                                                      










































































































                                                                            





















































































































                                                                                  
                      





                                                                                     
        





















                                                                                                       
                                                                                  










































































































































                                                                                                                                          
                             







                                                                      
        





























































































                                                                                             
                                   










































































                                                                                           
        





                                                      
                                            












































































































































































                                                                                                     
                        






                                                                                         
        






































                                                                                                                                     
                      

































































                                                                                      
                      























                                                                                                                       
        



































                                                                                                   
                         







                                                                          
        







































































































                                                                                                  
                              








                                                                       
        









                                                                            
                           




                                                                          
        















































































































































































































































































































































































































































                                                                                                             
(*
 * copyright (c) 2001 Fabrice Bellard
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * This is a part of Pascal porting of ffmpeg.
 * - Originally by Victor Zinetz for Delphi and Free Pascal on Windows.
 * - For Mac OS X, some modifications were made by The Creative CAT, denoted as CAT
 *   in the source codes.
 * - Changes and updates by the UltraStar Deluxe Team
 *
 * Conversion of libavcodec/avcodec.h
 * version: 52.122.0
 *
 *)

unit avcodec;

{$IFDEF FPC}
  {$MODE DELPHI }
  {$PACKENUM 4}    (* use 4-byte enums *)
  {$PACKRECORDS C} (* C/C++-compatible record packing *)
{$ELSE}
  {$MINENUMSIZE 4} (* use 4-byte enums *)
{$ENDIF}

{$IFDEF DARWIN}
  {$linklib libavcodec}
{$ENDIF}

interface

uses
  ctypes,
  avutil,
  rational,
  SysUtils,
  {$IFDEF UNIX}
  BaseUnix,
  {$ENDIF}
  UConfig;

const
  (*
   * IMPORTANT: The official FFmpeg C headers change very quickly. Often some
   * of the data structures are changed so that they become incompatible with
   * older header files. The Pascal headers have to be adjusted to those changes,
   * otherwise the application might crash randomly or strange bugs (not
   * necessarily related to video or audio due to buffer overflows etc.) might
   * occur.
   *
   * In the past users reported problems with USDX that took hours to fix and
   * the problem was an unsupported version of FFmpeg. So we decided to disable
   * support for future versions of FFmpeg until the headers are revised by us
   * for that version as they otherwise most probably will break USDX.
   *
   * If the headers do not yet support your FFmpeg version you may want to
   * adjust the max. version numbers manually but please note: it may work but
   * in many cases it does not. The USDX team does NOT PROVIDE ANY SUPPORT
   * for the game if the MAX. VERSION WAS CHANGED.
   *
   * The only safe way to support new versions of FFmpeg is to add the changes
   * of the FFmpeg git repository C headers to the Pascal headers.
   * You can accelerate this process by posting a patch with the git changes
   * translated to Pascal to our bug tracker (please join our IRC chat before
   * you start working on it). Simply adjusting the max. versions is NOT a valid
   * fix. 
   *)
  (* Supported version by this header *)
  LIBAVCODEC_MAX_VERSION_MAJOR   = 52;
  LIBAVCODEC_MAX_VERSION_MINOR   = 122;
  LIBAVCODEC_MAX_VERSION_RELEASE = 0;
  LIBAVCODEC_MAX_VERSION = (LIBAVCODEC_MAX_VERSION_MAJOR * VERSION_MAJOR) +
                           (LIBAVCODEC_MAX_VERSION_MINOR * VERSION_MINOR) +
                           (LIBAVCODEC_MAX_VERSION_RELEASE * VERSION_RELEASE);

  (* Min. supported version by this header *)
  LIBAVCODEC_MIN_VERSION_MAJOR   = 52;
  LIBAVCODEC_MIN_VERSION_MINOR   = 122;
  LIBAVCODEC_MIN_VERSION_RELEASE = 0;
  LIBAVCODEC_MIN_VERSION = (LIBAVCODEC_MIN_VERSION_MAJOR * VERSION_MAJOR) +
                            (LIBAVCODEC_MIN_VERSION_MINOR * VERSION_MINOR) +
                            (LIBAVCODEC_MIN_VERSION_RELEASE * VERSION_RELEASE);

(* Check if linked versions are supported *)
{$IF (LIBAVCODEC_VERSION < LIBAVCODEC_MIN_VERSION)}
//  {$MESSAGE Error 'Linked version of libavcodec is too old!'}
{$IFEND}

(* Check if linked version is supported *)
{$IF (LIBAVCODEC_VERSION > LIBAVCODEC_MAX_VERSION)}
//  {$MESSAGE Error 'Linked version of libavcodec is not yet supported!'}
{$IFEND}

(**
 * Those FF_API_* defines are not part of public API.
 * They may change, break or disappear at any time.
 *)
const
{$ifndef FF_API_PALETTE_CONTROL}
  FF_API_PALETTE_CONTROL = LIBAVCODEC_VERSION_MAJOR < 54;    
{$endif}
{$ifndef FF_API_MM_FLAGS}
  FF_API_MM_FLAGS = LIBAVCODEC_VERSION_MAJOR < 53;    
{$endif}
{$ifndef FF_API_OPT_SHOW}
  FF_API_OPT_SHOW = LIBAVCODEC_VERSION_MAJOR < 53;    
{$endif}
{$ifndef FF_API_AUDIO_OLD}
  FF_API_AUDIO_OLD = LIBAVCODEC_VERSION_MAJOR < 53;    
{$endif}
{$ifndef FF_API_VIDEO_OLD}
  FF_API_VIDEO_OLD = LIBAVCODEC_VERSION_MAJOR < 53;    
{$endif}
{$ifndef FF_API_SUBTITLE_OLD}
  FF_API_SUBTITLE_OLD = LIBAVCODEC_VERSION_MAJOR < 53;    
{$endif}
{$ifndef FF_API_USE_LPC}
  FF_API_USE_LPC = LIBAVCODEC_VERSION_MAJOR < 53;    
{$endif}
{$ifndef FF_API_SET_STRING_OLD}
  FF_API_SET_STRING_OLD = LIBAVCODEC_VERSION_MAJOR < 53;    
{$endif}
{$ifndef FF_API_INOFFICIAL}
  FF_API_INOFFICIAL = LIBAVCODEC_VERSION_MAJOR < 53;    
{$endif}
{$ifndef FF_API_OLD_SAMPLE_FMT}
  FF_API_OLD_SAMPLE_FMT = LIBAVCODEC_VERSION_MAJOR < 54;    
{$endif}
{$ifndef FF_API_OLD_AUDIOCONVERT}
  FF_API_OLD_AUDIOCONVERT = LIBAVCODEC_VERSION_MAJOR < 54;    
{$endif}
{$ifndef FF_API_HURRY_UP}
  FF_API_HURRY_UP = LIBAVCODEC_VERSION_MAJOR < 53;    
{$endif}
{$ifndef FF_API_RATE_EMU}
  FF_API_RATE_EMU = LIBAVCODEC_VERSION_MAJOR < 53;    
{$endif}
{$ifndef FF_API_MB_Q}
  FF_API_MB_Q = LIBAVCODEC_VERSION_MAJOR < 53;    
{$endif}
{$ifndef FF_API_ANTIALIAS_ALGO}
  FF_API_ANTIALIAS_ALGO = LIBAVCODEC_VERSION_MAJOR < 54;    
{$endif}
{$ifndef FF_API_REQUEST_CHANNELS}
  FF_API_REQUEST_CHANNELS = LIBAVCODEC_VERSION_MAJOR < 54;    
{$endif}
{$ifndef FF_API_OPT_H}
  FF_API_OPT_H = LIBAVCODEC_VERSION_MAJOR < 54;    
{$endif}
{$ifndef FF_API_THREAD_INIT}
  FF_API_THREAD_INIT = LIBAVCODEC_VERSION_MAJOR < 54;    
{$endif}
{$ifndef FF_API_OLD_FF_PICT_TYPES}
  FF_API_OLD_FF_PICT_TYPES = LIBAVCODEC_VERSION_MAJOR < 54;    
{$endif}
{$ifndef FF_API_FLAC_GLOBAL_OPTS}
  FF_API_FLAC_GLOBAL_OPTS = LIBAVCODEC_VERSION_MAJOR < 54;    
{$endif}
{$ifndef FF_API_GET_PIX_FMT_NAME}
  FF_API_GET_PIX_FMT_NAME = LIBAVCODEC_VERSION_MAJOR < 54;    
{$endif}

type
  FF_INTERNALC_MEM_TYPE = cuint;
  
const
  AV_NOPTS_VALUE: cint64  = $8000000000000000;
  AV_TIME_BASE            = 1000000;
  AV_TIME_BASE_Q: TAVRational = (num: 1; den: AV_TIME_BASE);

(**
 * Identify the syntax and semantics of the bitstream.
 * The principle is roughly:
 * Two decoders with the same ID can decode the same streams.
 * Two encoders with the same ID can encode compatible streams.
 * There may be slight deviations from the principle due to implementation
 * details.
 *
 * If you add a codec ID to this list, add it so that
 * 1. no value of a existing codec ID changes (that would break ABI),
 * 2. it is as close as possible to similar codecs.
 *)
type
  TCodecID = (
    CODEC_ID_NONE,
    
    //* video codecs */
    CODEC_ID_MPEG1VIDEO,
    CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
    CODEC_ID_MPEG2VIDEO_XVMC,
    CODEC_ID_H261,
    CODEC_ID_H263,
    CODEC_ID_RV10,
    CODEC_ID_RV20,
    CODEC_ID_MJPEG,
    CODEC_ID_MJPEGB,
    CODEC_ID_LJPEG,
    CODEC_ID_SP5X,
    CODEC_ID_JPEGLS,
    CODEC_ID_MPEG4,
    CODEC_ID_RAWVIDEO,
    CODEC_ID_MSMPEG4V1,
    CODEC_ID_MSMPEG4V2,
    CODEC_ID_MSMPEG4V3,
    CODEC_ID_WMV1,
    CODEC_ID_WMV2,
    CODEC_ID_H263P,
    CODEC_ID_H263I,
    CODEC_ID_FLV1,
    CODEC_ID_SVQ1,
    CODEC_ID_SVQ3,
    CODEC_ID_DVVIDEO,
    CODEC_ID_HUFFYUV,
    CODEC_ID_CYUV,
    CODEC_ID_H264,
    CODEC_ID_INDEO3,
    CODEC_ID_VP3,
    CODEC_ID_THEORA,
    CODEC_ID_ASV1,
    CODEC_ID_ASV2,
    CODEC_ID_FFV1,
    CODEC_ID_4XM,
    CODEC_ID_VCR1,
    CODEC_ID_CLJR,
    CODEC_ID_MDEC,
    CODEC_ID_ROQ,
    CODEC_ID_INTERPLAY_VIDEO,
    CODEC_ID_XAN_WC3,
    CODEC_ID_XAN_WC4,
    CODEC_ID_RPZA,
    CODEC_ID_CINEPAK,
    CODEC_ID_WS_VQA,
    CODEC_ID_MSRLE,
    CODEC_ID_MSVIDEO1,
    CODEC_ID_IDCIN,
    CODEC_ID_8BPS,
    CODEC_ID_SMC,
    CODEC_ID_FLIC,
    CODEC_ID_TRUEMOTION1,
    CODEC_ID_VMDVIDEO,
    CODEC_ID_MSZH,
    CODEC_ID_ZLIB,
    CODEC_ID_QTRLE,
    CODEC_ID_SNOW,
    CODEC_ID_TSCC,
    CODEC_ID_ULTI,
    CODEC_ID_QDRAW,
    CODEC_ID_VIXL,
    CODEC_ID_QPEG,
{$IF LIBAVCODEC_VERSION_MAJOR < 53}
    CODEC_ID_XVID,
{$IFEND}
    CODEC_ID_PNG,
    CODEC_ID_PPM,
    CODEC_ID_PBM,
    CODEC_ID_PGM,
    CODEC_ID_PGMYUV,
    CODEC_ID_PAM,
    CODEC_ID_FFVHUFF,
    CODEC_ID_RV30,
    CODEC_ID_RV40,
    CODEC_ID_VC1,
    CODEC_ID_WMV3,
    CODEC_ID_LOCO,
    CODEC_ID_WNV1,
    CODEC_ID_AASC,
    CODEC_ID_INDEO2,
    CODEC_ID_FRAPS,
    CODEC_ID_TRUEMOTION2,
    CODEC_ID_BMP,
    CODEC_ID_CSCD,
    CODEC_ID_MMVIDEO,
    CODEC_ID_ZMBV,
    CODEC_ID_AVS,
    CODEC_ID_SMACKVIDEO,
    CODEC_ID_NUV,
    CODEC_ID_KMVC,
    CODEC_ID_FLASHSV,
    CODEC_ID_CAVS,
    CODEC_ID_JPEG2000,
    CODEC_ID_VMNC,
    CODEC_ID_VP5,
    CODEC_ID_VP6,
    CODEC_ID_VP6F,
    CODEC_ID_TARGA,
    CODEC_ID_DSICINVIDEO,
    CODEC_ID_TIERTEXSEQVIDEO,
    CODEC_ID_TIFF,
    CODEC_ID_GIF,
    CODEC_ID_FFH264,
    CODEC_ID_DXA,
    CODEC_ID_DNXHD,
    CODEC_ID_THP,
    CODEC_ID_SGI,
    CODEC_ID_C93,
    CODEC_ID_BETHSOFTVID,
    CODEC_ID_PTX,
    CODEC_ID_TXD,
    CODEC_ID_VP6A,
    CODEC_ID_AMV,
    CODEC_ID_VB,
    CODEC_ID_PCX,
    CODEC_ID_SUNRAST,
    CODEC_ID_INDEO4,
    CODEC_ID_INDEO5,
    CODEC_ID_MIMIC,
    CODEC_ID_RL2,
    CODEC_ID_8SVX_EXP,
    CODEC_ID_8SVX_FIB,
    CODEC_ID_ESCAPE124,
    CODEC_ID_DIRAC,
    CODEC_ID_BFI,
    CODEC_ID_CMV,
    CODEC_ID_MOTIONPIXELS,
    CODEC_ID_TGV,
    CODEC_ID_TGQ,
    CODEC_ID_TQI,
    CODEC_ID_AURA,
    CODEC_ID_AURA2,
    CODEC_ID_V210X,
    CODEC_ID_TMV,
    CODEC_ID_V210,
    CODEC_ID_DPX,
    CODEC_ID_MAD,
    CODEC_ID_FRWU,
    CODEC_ID_FLASHSV2,
    CODEC_ID_CDGRAPHICS,
    CODEC_ID_R210,
    CODEC_ID_ANM,
    CODEC_ID_BINKVIDEO,
    CODEC_ID_IFF_ILBM,
    CODEC_ID_IFF_BYTERUN1,
    CODEC_ID_KGV1,
    CODEC_ID_YOP,
    CODEC_ID_VP8,
    CODEC_ID_PICTOR,
    CODEC_ID_ANSI,
    CODEC_ID_A64_MULTI,
    CODEC_ID_A64_MULTI5,
    CODEC_ID_R10K,
    CODEC_ID_MXPEG,
    CODEC_ID_LAGARITH,
    CODEC_ID_PRORES,
    CODEC_ID_JV,
    CODEC_ID_DFA,
    CODEC_ID_8SVX_RAW,

    //* various PCM "codecs" */
    CODEC_ID_PCM_S16LE= $10000,
    CODEC_ID_PCM_S16BE,
    CODEC_ID_PCM_U16LE,
    CODEC_ID_PCM_U16BE,
    CODEC_ID_PCM_S8,
    CODEC_ID_PCM_U8,
    CODEC_ID_PCM_MULAW,
    CODEC_ID_PCM_ALAW,
    CODEC_ID_PCM_S32LE,
    CODEC_ID_PCM_S32BE,
    CODEC_ID_PCM_U32LE,
    CODEC_ID_PCM_U32BE,
    CODEC_ID_PCM_S24LE,
    CODEC_ID_PCM_S24BE,
    CODEC_ID_PCM_U24LE,
    CODEC_ID_PCM_U24BE,
    CODEC_ID_PCM_S24DAUD,
    CODEC_ID_PCM_ZORK,
    CODEC_ID_PCM_S16LE_PLANAR,
    CODEC_ID_PCM_DVD,
    CODEC_ID_PCM_F32BE,
    CODEC_ID_PCM_F32LE,
    CODEC_ID_PCM_F64BE,
    CODEC_ID_PCM_F64LE,
    CODEC_ID_PCM_BLURAY,
    CODEC_ID_PCM_LXF,
    CODEC_ID_S302M,

    //* various ADPCM codecs */
    CODEC_ID_ADPCM_IMA_QT= $11000,
    CODEC_ID_ADPCM_IMA_WAV,
    CODEC_ID_ADPCM_IMA_DK3,
    CODEC_ID_ADPCM_IMA_DK4,
    CODEC_ID_ADPCM_IMA_WS,
    CODEC_ID_ADPCM_IMA_SMJPEG,
    CODEC_ID_ADPCM_MS,
    CODEC_ID_ADPCM_4XM,
    CODEC_ID_ADPCM_XA,
    CODEC_ID_ADPCM_ADX,
    CODEC_ID_ADPCM_EA,
    CODEC_ID_ADPCM_G726,
    CODEC_ID_ADPCM_CT,
    CODEC_ID_ADPCM_SWF,
    CODEC_ID_ADPCM_YAMAHA,
    CODEC_ID_ADPCM_SBPRO_4,
    CODEC_ID_ADPCM_SBPRO_3,
    CODEC_ID_ADPCM_SBPRO_2,
    CODEC_ID_ADPCM_THP,
    CODEC_ID_ADPCM_IMA_AMV,
    CODEC_ID_ADPCM_EA_R1,
    CODEC_ID_ADPCM_EA_R3,
    CODEC_ID_ADPCM_EA_R2,
    CODEC_ID_ADPCM_IMA_EA_SEAD,
    CODEC_ID_ADPCM_IMA_EA_EACS,
    CODEC_ID_ADPCM_EA_XAS,
    CODEC_ID_ADPCM_EA_MAXIS_XA,
    CODEC_ID_ADPCM_IMA_ISS,
    CODEC_ID_ADPCM_G722,

    //* AMR */
    CODEC_ID_AMR_NB= $12000,
    CODEC_ID_AMR_WB,

    //* RealAudio codecs*/
    CODEC_ID_RA_144= $13000,
    CODEC_ID_RA_288,

    //* various DPCM codecs */
    CODEC_ID_ROQ_DPCM= $14000,
    CODEC_ID_INTERPLAY_DPCM,
    CODEC_ID_XAN_DPCM,
    CODEC_ID_SOL_DPCM,

    //* audio codecs */
    CODEC_ID_MP2= $15000,
    CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
    CODEC_ID_AAC,
    CODEC_ID_AC3,
    CODEC_ID_DTS,
    CODEC_ID_VORBIS,
    CODEC_ID_DVAUDIO,
    CODEC_ID_WMAV1,
    CODEC_ID_WMAV2,
    CODEC_ID_MACE3,
    CODEC_ID_MACE6,
    CODEC_ID_VMDAUDIO,
    CODEC_ID_SONIC,
    CODEC_ID_SONIC_LS,
    CODEC_ID_FLAC,
    CODEC_ID_MP3ADU,
    CODEC_ID_MP3ON4,
    CODEC_ID_SHORTEN,
    CODEC_ID_ALAC,
    CODEC_ID_WESTWOOD_SND1,
    CODEC_ID_GSM, ///< as in Berlin toast format
    CODEC_ID_QDM2,
    CODEC_ID_COOK,
    CODEC_ID_TRUESPEECH,
    CODEC_ID_TTA,
    CODEC_ID_SMACKAUDIO,
    CODEC_ID_QCELP,
    CODEC_ID_WAVPACK,
    CODEC_ID_DSICINAUDIO,
    CODEC_ID_IMC,
    CODEC_ID_MUSEPACK7,
    CODEC_ID_MLP,
    CODEC_ID_GSM_MS, { as found in WAV }
    CODEC_ID_ATRAC3,
    CODEC_ID_VOXWARE,
    CODEC_ID_APE,
    CODEC_ID_NELLYMOSER,
    CODEC_ID_MUSEPACK8,
    CODEC_ID_SPEEX,
    CODEC_ID_WMAVOICE,
    CODEC_ID_WMAPRO,
    CODEC_ID_WMALOSSLESS,
    CODEC_ID_ATRAC3P,
    CODEC_ID_EAC3,
    CODEC_ID_SIPR,
    CODEC_ID_MP1,
    CODEC_ID_TWINVQ,
    CODEC_ID_TRUEHD,
    CODEC_ID_MP4ALS,
    CODEC_ID_ATRAC1,
    CODEC_ID_BINKAUDIO_RDFT,
    CODEC_ID_BINKAUDIO_DCT,
    CODEC_ID_AAC_LATM,
    CODEC_ID_QDMC,
    CODEC_ID_CELT,

    //* subtitle codecs */
    CODEC_ID_DVD_SUBTITLE= $17000,
    CODEC_ID_DVB_SUBTITLE,
    CODEC_ID_TEXT,  ///< raw UTF-8 text
    CODEC_ID_XSUB,
    CODEC_ID_SSA,
    CODEC_ID_MOV_TEXT,
    CODEC_ID_HDMV_PGS_SUBTITLE,
    CODEC_ID_DVB_TELETEXT,
    CODEC_ID_SRT,
    CODEC_ID_MICRODVD,

    //* other specific kind of codecs (generally used for attachments) */
    CODEC_ID_TTF= $18000,

    CODEC_ID_PROBE= $19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it

    CODEC_ID_MPEG2TS= $20000, (**< _FAKE_ codec to indicate a raw MPEG-2 TS
                               * stream (only used by libavformat) *)
    CODEC_ID_FFMETADATA= $21000   ///< Dummy codec for streams containing only metadata information.
  );

type
  TCodecType = TAVMediaType;

const
  CODEC_TYPE_UNKNOWN    = AVMEDIA_TYPE_UNKNOWN;
  CODEC_TYPE_VIDEO      = AVMEDIA_TYPE_VIDEO;
  CODEC_TYPE_AUDIO      = AVMEDIA_TYPE_AUDIO;
  CODEC_TYPE_DATA       = AVMEDIA_TYPE_DATA;
  CODEC_TYPE_SUBTITLE   = AVMEDIA_TYPE_SUBTITLE;
  CODEC_TYPE_ATTACHMENT = AVMEDIA_TYPE_ATTACHMENT;
  CODEC_TYPE_NB         = AVMEDIA_TYPE_NB;

{$IF FF_API_OLD_AUDIOCONVERT}

{$I libavcodec/audioconvert.pas}

const
  {* Audio channel masks *}
  CH_FRONT_LEFT             = AV_CH_FRONT_LEFT;
  CH_FRONT_RIGHT            = AV_CH_FRONT_RIGHT;
  CH_FRONT_CENTER           = AV_CH_FRONT_CENTER;
  CH_LOW_FREQUENCY          = AV_CH_LOW_FREQUENCY;
  CH_BACK_LEFT              = AV_CH_BACK_LEFT;
  CH_BACK_RIGHT             = AV_CH_BACK_RIGHT;
  CH_FRONT_LEFT_OF_CENTER   = AV_CH_FRONT_LEFT_OF_CENTER;
  CH_FRONT_RIGHT_OF_CENTER  = AV_CH_FRONT_RIGHT_OF_CENTER;
  CH_BACK_CENTER            = AV_CH_BACK_CENTER;
  CH_SIDE_LEFT              = AV_CH_SIDE_LEFT;
  CH_SIDE_RIGHT             = AV_CH_SIDE_RIGHT;
  CH_TOP_CENTER             = AV_CH_TOP_CENTER;
  CH_TOP_FRONT_LEFT         = AV_CH_TOP_FRONT_LEFT;
  CH_TOP_FRONT_CENTER       = AV_CH_TOP_FRONT_CENTER;
  CH_TOP_FRONT_RIGHT        = AV_CH_TOP_FRONT_RIGHT;
  CH_TOP_BACK_LEFT          = AV_CH_TOP_BACK_LEFT;
  CH_TOP_BACK_CENTER        = AV_CH_TOP_BACK_CENTER;
  CH_TOP_BACK_RIGHT         = AV_CH_TOP_BACK_RIGHT;
  CH_STEREO_LEFT            = AV_CH_STEREO_LEFT;
  CH_STEREO_RIGHT           = AV_CH_STEREO_RIGHT;

{** Channel mask value used for AVCodecContext.request_channel_layout
 *  to indicate that the user requests the channel order of the decoder output
 *  to be the native codec channel order.
 *}
  CH_LAYOUT_NATIVE          = AV_CH_LAYOUT_NATIVE;

  {* Audio channel convenience macros *}
  CH_LAYOUT_MONO            = AV_CH_LAYOUT_MONO;
  CH_LAYOUT_STEREO          = AV_CH_LAYOUT_STEREO;
  CH_LAYOUT_2_1             = AV_CH_LAYOUT_2_1;
  CH_LAYOUT_SURROUND        = AV_CH_LAYOUT_SURROUND;
  CH_LAYOUT_4POINT0         = AV_CH_LAYOUT_4POINT0;
  CH_LAYOUT_2_2             = AV_CH_LAYOUT_2_2;
  CH_LAYOUT_QUAD            = AV_CH_LAYOUT_QUAD;
  CH_LAYOUT_5POINT0         = AV_CH_LAYOUT_5POINT0;
  CH_LAYOUT_5POINT1         = AV_CH_LAYOUT_5POINT1;
  CH_LAYOUT_5POINT0_BACK    = AV_CH_LAYOUT_5POINT0_BACK;
  CH_LAYOUT_5POINT1_BACK    = AV_CH_LAYOUT_5POINT1_BACK;
  CH_LAYOUT_7POINT0         = AV_CH_LAYOUT_7POINT0;
  CH_LAYOUT_7POINT1         = AV_CH_LAYOUT_7POINT1;
  CH_LAYOUT_7POINT1_WIDE    = AV_CH_LAYOUT_7POINT1_WIDE;
  CH_LAYOUT_STEREO_DOWNMIX  = AV_CH_LAYOUT_STEREO_DOWNMIX;
{$IFEND}

{* in bytes *}
  AVCODEC_MAX_AUDIO_FRAME_SIZE = 192000; // 1 second of 48khz 32bit audio

{**
 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
 * This is mainly needed because some optimized bitstream readers read
 * 32 or 64 bit at once and could read over the end.<br>
 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
 * MPEG bitstreams could cause overread and segfault.
 *}
  FF_INPUT_BUFFER_PADDING_SIZE = 8;

{**
 * minimum encoding buffer size.
 * Used to avoid some checks during header writing.
 *}
  FF_MIN_BUFFER_SIZE = 16384;

type
{*
 * motion estimation type.
 *}
  TMotion_Est_ID = (
    ME_ZERO = 1,  ///< no search, that is use 0,0 vector whenever one is needed
    ME_FULL,
    ME_LOG,
    ME_PHODS,
    ME_EPZS,      ///< enhanced predictive zonal search
    ME_X1,        ///< reserved for experiments
    ME_HEX,       ///< hexagon based search
    ME_UMH,       ///< uneven multi-hexagon search
    ME_ITER,      ///< iterative search
    ME_TESA       ///< transformed exhaustive search algorithm
  );

  TAVDiscard = (
    {* We leave some space between them for extensions (drop some
     * keyframes for intra-only or drop just some bidir frames).
     *}
    AVDISCARD_NONE    = -16, ///< discard nothing
    AVDISCARD_DEFAULT =   0, ///< discard useless packets like 0 size packets in avi
    AVDISCARD_NONREF  =   8, ///< discard all non reference
    AVDISCARD_BIDIR   =  16, ///< discard all bidirectional frames
    AVDISCARD_NONKEY  =  32, ///< discard all frames except keyframes
    AVDISCARD_ALL     =  48  ///< discard all
  );

  TAVColorPrimaries = (
    AVCOL_PRI_BT709       = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
    AVCOL_PRI_UNSPECIFIED = 2,
    AVCOL_PRI_BT470M      = 4,
    AVCOL_PRI_BT470BG     = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
    AVCOL_PRI_SMPTE170M   = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
    AVCOL_PRI_SMPTE240M   = 7, ///< functionally identical to above
    AVCOL_PRI_FILM        = 8,
    AVCOL_PRI_NB               ///< Not part of ABI
  );

  TAVColorTransferCharacteristic = (
    AVCOL_TRC_BT709       = 1, ///< also ITU-R BT1361
    AVCOL_TRC_UNSPECIFIED = 2,
    AVCOL_TRC_GAMMA22     = 4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
    AVCOL_TRC_GAMMA28     = 5, ///< also ITU-R BT470BG
    AVCOL_TRC_NB               ///< Not part of ABI
  );

  TAVColorSpace = (
    AVCOL_SPC_RGB         = 0,
    AVCOL_SPC_BT709       = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
    AVCOL_SPC_UNSPECIFIED = 2,
    AVCOL_SPC_FCC         = 4,
    AVCOL_SPC_BT470BG     = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM / IEC 61966-2-4 xvYCC601
    AVCOL_SPC_SMPTE170M   = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
    AVCOL_SPC_SMPTE240M   = 7,
    AVCOL_SPC_NB               ///< Not part of ABI
  );

  TAVColorRange = (
    AVCOL_RANGE_UNSPECIFIED = 0,
    AVCOL_RANGE_MPEG        = 1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
    AVCOL_RANGE_JPEG        = 2, ///< the normal     2^n-1   "JPEG" YUV ranges
    AVCOL_RANGE_NB               ///< Not part of ABI
  );

(**
 *  X   X      3 4 X      X are luma samples,
 *             1 2        1-6 are possible chroma positions
 *  X   X      5 6 X      0 is undefined/unknown position
 *)
  TAVChromaLocation = (
    AVCHROMA_LOC_UNSPECIFIED = 0,
    AVCHROMA_LOC_LEFT        = 1, ///< mpeg2/4, h264 default
    AVCHROMA_LOC_CENTER      = 2, ///< mpeg1, jpeg, h263
    AVCHROMA_LOC_TOPLEFT     = 3, ///< DV
    AVCHROMA_LOC_TOP         = 4,
    AVCHROMA_LOC_BOTTOMLEFT  = 5,
    AVCHROMA_LOC_BOTTOM      = 6,
    AVCHROMA_LOC_NB               ///< Not part of ABI
  );

{$IF FF_API_FLAC_GLOBAL_OPTS}
(**
 * LPC analysis type
 *)
  TAVLPCType = (
    AV_LPC_TYPE_DEFAULT     = -1, ///< use the codec default LPC type
    AV_LPC_TYPE_NONE        =  0, ///< do not use LPC prediction or use all zero coefficients
    AV_LPC_TYPE_FIXED       =  1, ///< fixed LPC coefficients
    AV_LPC_TYPE_LEVINSON    =  2, ///< Levinson-Durbin recursion
    AV_LPC_TYPE_CHOLESKY    =  3, ///< Cholesky factorization
    AV_LPC_TYPE_NB                ///< Not part of ABI
  );
{$IFEND}

  TAVAudioServiceType =(
    AV_AUDIO_SERVICE_TYPE_MAIN              = 0,
    AV_AUDIO_SERVICE_TYPE_EFFECTS           = 1,
    AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
    AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED  = 3,
    AV_AUDIO_SERVICE_TYPE_DIALOGUE          = 4,
    AV_AUDIO_SERVICE_TYPE_COMMENTARY        = 5,
    AV_AUDIO_SERVICE_TYPE_EMERGENCY         = 6,
    AV_AUDIO_SERVICE_TYPE_VOICE_OVER        = 7,
    AV_AUDIO_SERVICE_TYPE_KARAOKE           = 8,
    AV_AUDIO_SERVICE_TYPE_NB                     ///< Not part of ABI
  );

  PRcOverride = ^TRcOverride;
  TRcOverride = record {16}
    start_frame:    cint;
    end_frame:      cint;
    qscale:         cint; // if this is 0 then quality_factor will be used instead
    quality_factor: cfloat;
  end;

const
  FF_MAX_B_FRAMES = 16;

{* encoding support
   These flags can be passed in AVCodecContext.flags before initialization.
   Note: Not everything is supported yet.
*}

  CODEC_FLAG_QSCALE = $0002;  ///< Use fixed qscale.
  CODEC_FLAG_4MV    = $0004;  ///< 4 MV per MB allowed / advanced prediction for H263.
  CODEC_FLAG_QPEL   = $0010;  ///< use qpel MC.
  CODEC_FLAG_GMC    = $0020;  ///< use GMC.
  CODEC_FLAG_MV0    = $0040;  ///< always try a MB with MV=<0,0>.
  CODEC_FLAG_PART   = $0080;  ///< Use data partitioning.
  {**
   * The parent program guarantees that the input for B-frames containing
   * streams is not written to for at least s->max_b_frames+1 frames, if
   * this is not set the input will be copied.
   *}
  CODEC_FLAG_INPUT_PRESERVED    = $0100;
  CODEC_FLAG_PASS1              = $0200; ///< use internal 2pass ratecontrol in first  pass mode
  CODEC_FLAG_PASS2              = $0400; ///< use internal 2pass ratecontrol in second pass mode
  CODEC_FLAG_EXTERN_HUFF        = $1000; ///< use external huffman table (for mjpeg)
  CODEC_FLAG_GRAY               = $2000; ///< only decode/encode grayscale
  CODEC_FLAG_EMU_EDGE           = $4000; ///< don't draw edges
  CODEC_FLAG_PSNR               = $8000; ///< error[?] variables will be set during encoding
  CODEC_FLAG_TRUNCATED      = $00010000; //** input bitstream might be truncated at a random
                                         //   location instead of only at frame boundaries */
  CODEC_FLAG_NORMALIZE_AQP  = $00020000; ///< normalize adaptive quantization
  CODEC_FLAG_INTERLACED_DCT = $00040000; ///< use interlaced dct
  CODEC_FLAG_LOW_DELAY      = $00080000; ///< force low delay
  CODEC_FLAG_ALT_SCAN       = $00100000; ///< use alternate scan
  CODEC_FLAG_GLOBAL_HEADER  = $00400000; ///< place global headers in extradata instead of every keyframe
  CODEC_FLAG_BITEXACT       = $00800000; ///< use only bitexact stuff (except (i)dct)
  {* Fx : Flag for h263+ extra options *}
  CODEC_FLAG_AC_PRED        = $01000000; ///< H263 Advanced intra coding / MPEG4 AC prediction
  CODEC_FLAG_H263P_UMV      = $02000000; ///< Unlimited motion vector
  CODEC_FLAG_CBP_RD         = $04000000; ///< use rate distortion optimization for cbp
  CODEC_FLAG_QP_RD          = $08000000; ///< use rate distortion optimization for qp selectioon
  CODEC_FLAG_H263P_AIV      = $00000008; ///< H263 Alternative inter vlc
  CODEC_FLAG_OBMC           = $00000001; ///< OBMC
  CODEC_FLAG_LOOP_FILTER    = $00000800; ///< loop filter
  CODEC_FLAG_H263P_SLICE_STRUCT = $10000000;
  CODEC_FLAG_INTERLACED_ME  = $20000000; ///< interlaced motion estimation
  CODEC_FLAG_SVCD_SCAN_OFFSET = $40000000; ///< will reserve space for SVCD scan offset user data
  CODEC_FLAG_CLOSED_GOP     = $80000000;
  CODEC_FLAG2_FAST          = $00000001; ///< allow non spec compliant speedup tricks
  CODEC_FLAG2_STRICT_GOP    = $00000002; ///< strictly enforce GOP size
  CODEC_FLAG2_NO_OUTPUT     = $00000004; ///< skip bitstream encoding
  CODEC_FLAG2_LOCAL_HEADER  = $00000008; ///< place global headers at every keyframe instead of in extradata
  CODEC_FLAG2_BPYRAMID      = $00000010; ///< H.264 allow b-frames to be used as references
  CODEC_FLAG2_WPRED         = $00000020; ///< H.264 weighted biprediction for b-frames
  CODEC_FLAG2_MIXED_REFS    = $00000040; ///< H.264 multiple references per partition
  CODEC_FLAG2_8X8DCT        = $00000080; ///< H.264 high profile 8x8 transform
  CODEC_FLAG2_FASTPSKIP     = $00000100; ///< H.264 fast pskip
  CODEC_FLAG2_AUD           = $00000200; ///< H.264 access unit delimiters
  CODEC_FLAG2_BRDO          = $00000400; ///< b-frame rate-distortion optimization
  CODEC_FLAG2_INTRA_VLC     = $00000800; ///< use MPEG-2 intra VLC table
  CODEC_FLAG2_MEMC_ONLY     = $00001000; ///< only do ME/MC (I frames -> ref, P frame -> ME+MC)
  CODEC_FLAG2_DROP_FRAME_TIMECODE = $00002000; ///< timecode is in drop frame format.
  CODEC_FLAG2_SKIP_RD       = $00004000; ///< RD optimal MB level residual skipping
  CODEC_FLAG2_CHUNKS        = $00008000; ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
  CODEC_FLAG2_NON_LINEAR_QUANT = $00010000; ///< Use MPEG-2 nonlinear quantizer.
  CODEC_FLAG2_BIT_RESERVOIR = $00020000; ///< Use a bit reservoir when encoding if possible
  CODEC_FLAG2_MBTREE        = $00040000; ///< Use macroblock tree ratecontrol (x264 only)
  CODEC_FLAG2_PSY           = $00080000; ///< Use psycho visual optimizations.
  CODEC_FLAG2_SSIM          = $00100000; ///< Compute SSIM during encoding, error[] values are undefined.
  CODEC_FLAG2_INTRA_REFRESH = $00200000; ///< Use periodic insertion of intra blocks instead of keyframes.

(* Unsupported options :
 *              Syntax Arithmetic coding (SAC)
 *              Reference Picture Selection
 *              Independant Segment Decoding *)
(* /Fx *)
(* codec capabilities *)

  CODEC_CAP_DRAW_HORIZ_BAND = $0001; ///< decoder can use draw_horiz_band callback

  (**
   * Codec uses get_buffer() for allocating buffers and supports custom allocators.
   * If not set, it might not use get_buffer() at all or use operations that
   * assume the buffer was allocated by avcodec_default_get_buffer.
   *)
  CODEC_CAP_DR1             = $0002;
  (* if 'parse_only' field is true, then avcodec_parse_frame() can be used *)
  CODEC_CAP_PARSE_ONLY      = $0004;
  CODEC_CAP_TRUNCATED       = $0008;

  (* codec can export data for HW decoding (XvMC) *)
  CODEC_CAP_HWACCEL         = $0010;

  (**
   * codec has a non zero delay and needs to be feeded with NULL at the end to get the delayed data.
   * if this is not set, the codec is guranteed to never be feeded with NULL data
   *)
  CODEC_CAP_DELAY           = $0020;

  (**
   * Codec can be fed a final frame with a smaller size.
   * This can be used to prevent truncation of the last audio samples.
   *)
  CODEC_CAP_SMALL_LAST_FRAME = $0040;

  (**
   * Codec can export data for HW decoding (VDPAU).
   *)
  CODEC_CAP_HWACCEL_VDPAU    = $0080;

  (**
   * Codec can output multiple frames per AVPacket
   * Normally demuxers return one frame at a time, demuxers which do not do
   * are connected to a parser to split what they return into proper frames.
   * This flag is reserved to the very rare category of codecs which have a
   * bitstream that cannot be split into frames without timeconsuming
   * operations like full decoding. Demuxers carring such bitstreams thus
   * may return multiple frames in a packet. This has many disadvantages like
   * prohibiting stream copy in many cases thus it should only be considered
   * as a last resort.
   *)
  CODEC_CAP_SUBFRAMES        = $0100;

  (**
   * Codec is experimental and is thus avoided in favor of non experimental
   * encoders
   *)
  CODEC_CAP_EXPERIMENTAL     = $0200;

  (**
   * Codec should fill in channel configuration and samplerate instead of container
   *)
  CODEC_CAP_CHANNEL_CONF     = $0400;
  
  (**
   * Codec is able to deal with negative linesizes
   *)
  CODEC_CAP_NEG_LINESIZES    = $0800;
  
  (**
   * Codec supports frame-level multithreading.
   *)
  CODEC_CAP_FRAME_THREADS    = $1000;

  (**
   * Codec supports slice-based (or partition-based) multithreading.
   *)
  CODEC_CAP_SLICE_THREADS    = $2000;

  (**
   * Codec is lossless.
   *)
  CODEC_CAP_LOSSLESS         = $80000000;

   //the following defines may change, don't expect compatibility if you use them
   MB_TYPE_INTRA4x4   = $001;
   MB_TYPE_INTRA16x16 = $002; //FIXME h264 specific
   MB_TYPE_INTRA_PCM  = $004; //FIXME h264 specific
   MB_TYPE_16x16      = $008;
   MB_TYPE_16x8       = $010;
   MB_TYPE_8x16       = $020;
   MB_TYPE_8x8        = $040;
   MB_TYPE_INTERLACED = $080;
   MB_TYPE_DIRECT2    = $100; //FIXME
   MB_TYPE_ACPRED     = $200;
   MB_TYPE_GMC        = $400;
   MB_TYPE_SKIP       = $800;
   MB_TYPE_P0L0       = $1000;
   MB_TYPE_P1L0       = $2000;
   MB_TYPE_P0L1       = $4000;
   MB_TYPE_P1L1       = $8000;
   MB_TYPE_L0         = (MB_TYPE_P0L0 or MB_TYPE_P1L0);
   MB_TYPE_L1         = (MB_TYPE_P0L1 or MB_TYPE_P1L1);
   MB_TYPE_L0L1       = (MB_TYPE_L0   or MB_TYPE_L1);
   MB_TYPE_QUANT      = $0010000;
   MB_TYPE_CBP        = $0020000;
   //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)

type
(**
 * Pan Scan area.
 * This specifies the area which should be displayed.
 * Note there may be multiple such areas for one frame.
 *)
  PAVPanScan = ^TAVPanScan;
  TAVPanScan = record {24}
    (*** id.
     * - encoding: set by user.
     * - decoding: set by libavcodec. *)
    id: cint;

    (*** width and height in 1/16 pel
     * - encoding: set by user.
     * - decoding: set by libavcodec. *)
    width: cint;
    height: cint;

    (*** position of the top left corner in 1/16 pel for up to 3 fields/frames.
     * - encoding: set by user.
     * - decoding: set by libavcodec. *)
    position: array [0..2] of array [0..1] of cint16;
  end; {TAVPanScan}

const
  FF_QSCALE_TYPE_MPEG1  = 0;
  FF_QSCALE_TYPE_MPEG2  = 1;
  FF_QSCALE_TYPE_H264   = 2;
  FF_QSCALE_TYPE_VP56   = 3;

  FF_BUFFER_TYPE_INTERNAL = 1;
  FF_BUFFER_TYPE_USER     = 2; ///< Direct rendering buffers (image is (de)allocated by user)
  FF_BUFFER_TYPE_SHARED   = 4; ///< buffer from somewhere else, don't dealloc image (data/base), all other tables are not shared
  FF_BUFFER_TYPE_COPY     = 8; ///< just a (modified) copy of some other buffer, don't dealloc anything.

{$IF FF_API_OLD_FF_PICT_TYPES}
(* DEPRECATED, directly use the AV_PICTURE_TYPE_* enum values *)
  FF_I_TYPE  = 1; ///< Intra
  FF_P_TYPE  = 2; ///< Predicted
  FF_B_TYPE  = 3; ///< Bi-dir predicted
  FF_S_TYPE  = 4; ///< S(GMC)-VOP MPEG4
  FF_SI_TYPE = 5; ///< Switching Intra
  FF_SP_TYPE = 6; ///< Switching Predicted
  FF_BI_TYPE = 7;
{$IFEND}

  FF_BUFFER_HINTS_VALID    = $01; // Buffer hints value is meaningful (if 0 ignore)
  FF_BUFFER_HINTS_READABLE = $02; // Codec will read from buffer
  FF_BUFFER_HINTS_PRESERVE = $04; // User must not alter buffer content
  FF_BUFFER_HINTS_REUSABLE = $08; // Codec will reuse the buffer (update)

  FF_ASPECT_EXTENDED = 15;

  FF_RC_STRATEGY_XVID = 1;

  FF_BUG_AUTODETECT       = 1;  ///< autodetection
  FF_BUG_OLD_MSMPEG4      = 2;
  FF_BUG_XVID_ILACE       = 4;
  FF_BUG_UMP4             = 8;
  FF_BUG_NO_PADDING       = 16;
  FF_BUG_AMV              = 32;
  FF_BUG_AC_VLC           = 0;  ///< will be removed, libavcodec can now handle these non compliant files by default
  FF_BUG_QPEL_CHROMA      = 64;
  FF_BUG_STD_QPEL         = 128;
  FF_BUG_QPEL_CHROMA2     = 256;
  FF_BUG_DIRECT_BLOCKSIZE = 512;
  FF_BUG_EDGE             = 1024;
  FF_BUG_HPEL_CHROMA      = 2048;
  FF_BUG_DC_CLIP          = 4096;
  FF_BUG_MS               = 8192; ///< workaround various bugs in microsofts broken decoders
  FF_BUG_TRUNCATED        = 16384;
  //FF_BUG_FAKE_SCALABILITY = 16 //Autodetection should work 100%.

  FF_COMPLIANCE_VERY_STRICT   =  2; ///< strictly conform to an older more strict version of the spec or reference software
  FF_COMPLIANCE_STRICT        =  1; ///< strictly conform to all the things in the spec no matter what consequences
  FF_COMPLIANCE_NORMAL        =  0;
{$IF FF_API_INOFFICIAL}
  FF_COMPLIANCE_INOFFICIAL    = -1; ///< Allow inofficial extensions
{$IFEND}
  FF_COMPLIANCE_UNOFFICIAL    = -1; ///< Allow unofficial extensions
  FF_COMPLIANCE_EXPERIMENTAL  = -2; ///< Allow nonstandardized experimental things.

  FF_ER_CAREFUL         = 1;
  FF_ER_COMPLIANT       = 2;
  FF_ER_AGGRESSIVE      = 3;
  FF_ER_VERY_AGGRESSIVE = 4;

  FF_DCT_AUTO    = 0;
  FF_DCT_FASTINT = 1;
  FF_DCT_INT     = 2;
  FF_DCT_MMX     = 3;
  FF_DCT_MLIB    = 4;
  FF_DCT_ALTIVEC = 5;
  FF_DCT_FAAN    = 6;

  FF_IDCT_AUTO         = 0;
  FF_IDCT_INT          = 1;
  FF_IDCT_SIMPLE       = 2;
  FF_IDCT_SIMPLEMMX    = 3;
  FF_IDCT_LIBMPEG2MMX  = 4;
  FF_IDCT_PS2          = 5;
  FF_IDCT_MLIB         = 6;
  FF_IDCT_ARM          = 7;
  FF_IDCT_ALTIVEC      = 8;
  FF_IDCT_SH4          = 9;
  FF_IDCT_SIMPLEARM    = 10;
  FF_IDCT_H264         = 11;
  FF_IDCT_VP3          = 12;
  FF_IDCT_IPP          = 13;
  FF_IDCT_XVIDMMX      = 14;
  FF_IDCT_CAVS         = 15;
  FF_IDCT_SIMPLEARMV5TE= 16;
  FF_IDCT_SIMPLEARMV6  = 17;
  FF_IDCT_SIMPLEVIS    = 18;
  FF_IDCT_WMV2         = 19;
  FF_IDCT_FAAN         = 20;
  FF_IDCT_EA           = 21;
  FF_IDCT_SIMPLENEON   = 22;
  FF_IDCT_SIMPLEALPHA  = 23;
  FF_IDCT_BINK         = 24;

  FF_EC_GUESS_MVS   = 1;
  FF_EC_DEBLOCK     = 2;

{$IF FF_API_MM_FLAGS}
  FF_MM_FORCE       = AV_CPU_FLAG_FORCE;
  FF_MM_MMX         = AV_CPU_FLAG_MMX;
  FF_MM_3DNOW       = AV_CPU_FLAG_3DNOW;
  FF_MM_MMXEXT      = AV_CPU_FLAG_MMX2;
  FF_MM_MMX2        = AV_CPU_FLAG_MMX2;
  FF_MM_SSE         = AV_CPU_FLAG_SSE;
  FF_MM_SSE2        = AV_CPU_FLAG_SSE2;
  FF_MM_SSE2SLOW    = AV_CPU_FLAG_SSE2SLOW;
  FF_MM_3DNOWEXT    = AV_CPU_FLAG_3DNOWEXT;
  FF_MM_SSE3        = AV_CPU_FLAG_SSE3;
  FF_MM_SSE3SLOW    = AV_CPU_FLAG_SSE3SLOW;
  FF_MM_SSSE3       = AV_CPU_FLAG_SSSE3;
  FF_MM_SSE4        = AV_CPU_FLAG_SSE4;
  FF_MM_SSE42       = AV_CPU_FLAG_SSE42;
  FF_MM_IWMMXT      = AV_CPU_FLAG_IWMMXT;
  FF_MM_ALTIVEC     = AV_CPU_FLAG_ALTIVEC;
{$IFEND}

  FF_PRED_LEFT   = 0;
  FF_PRED_PLANE  = 1;
  FF_PRED_MEDIAN = 2;

  FF_DEBUG_PICT_INFO    = 1;
  FF_DEBUG_RC           = 2;
  FF_DEBUG_BITSTREAM    = 4;
  FF_DEBUG_MB_TYPE      = 8;
  FF_DEBUG_QP           = 16;
  FF_DEBUG_MV           = 32;
  FF_DEBUG_DCT_COEFF    = $00000040;
  FF_DEBUG_SKIP         = $00000080;
  FF_DEBUG_STARTCODE    = $00000100;
  FF_DEBUG_PTS          = $00000200;
  FF_DEBUG_ER           = $00000400;
  FF_DEBUG_MMCO         = $00000800;
  FF_DEBUG_BUGS         = $00001000;
  FF_DEBUG_VIS_QP       = $00002000;
  FF_DEBUG_VIS_MB_TYPE  = $00004000;
  FF_DEBUG_BUFFERS      = $00008000;

  FF_DEBUG_VIS_MV_P_FOR  = $00000001; //visualize forward predicted MVs of P frames
  FF_DEBUG_VIS_MV_B_FOR  = $00000002; //visualize forward predicted MVs of B frames
  FF_DEBUG_VIS_MV_B_BACK = $00000004; //visualize backward predicted MVs of B frames

  FF_CMP_SAD    = 0;
  FF_CMP_SSE    = 1;
  FF_CMP_SATD   = 2;
  FF_CMP_DCT    = 3;
  FF_CMP_PSNR   = 4;
  FF_CMP_BIT    = 5;
  FF_CMP_RD     = 6;
  FF_CMP_ZERO   = 7;
  FF_CMP_VSAD   = 8;
  FF_CMP_VSSE   = 9;
  FF_CMP_NSSE   = 10;
  FF_CMP_W53    = 11;
  FF_CMP_W97    = 12;
  FF_CMP_DCTMAX = 13;
  FF_CMP_DCT264 = 14;
  FF_CMP_CHROMA = 256;

  FF_DTG_AFD_SAME         = 8;
  FF_DTG_AFD_4_3          = 9;
  FF_DTG_AFD_16_9         = 10;
  FF_DTG_AFD_14_9         = 11;
  FF_DTG_AFD_4_3_SP_14_9  = 13;
  FF_DTG_AFD_16_9_SP_14_9 = 14;
  FF_DTG_AFD_SP_4_3       = 15;

  FF_DEFAULT_QUANT_BIAS   = 999999;

  FF_CODER_TYPE_VLC       = 0;
  FF_CODER_TYPE_AC        = 1;
  FF_CODER_TYPE_RAW       = 2;
  FF_CODER_TYPE_RLE       = 3;
  FF_CODER_TYPE_DEFLATE   = 4;

  SLICE_FLAG_CODED_ORDER    = $0001; ///< draw_horiz_band() is called in coded order instead of display
  SLICE_FLAG_ALLOW_FIELD    = $0002; ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
  SLICE_FLAG_ALLOW_PLANE    = $0004; ///< allow draw_horiz_band() with 1 component at a time (SVQ1)

  FF_MB_DECISION_SIMPLE = 0;        ///< uses mb_cmp
  FF_MB_DECISION_BITS   = 1;        ///< chooses the one which needs the fewest bits
  FF_MB_DECISION_RD     = 2;        ///< rate distortion

{$IF FF_API_ANTIALIAS_ALGO}
  FF_AA_AUTO    = 0;
  FF_AA_FASTINT = 1; //not implemented yet
  FF_AA_INT     = 2;
  FF_AA_FLOAT   = 3;
{$IFEND}

  FF_PROFILE_UNKNOWN  = -99;
  FF_PROFILE_RESERVED = -100;

  FF_PROFILE_AAC_MAIN = 0;
  FF_PROFILE_AAC_LOW  = 1;
  FF_PROFILE_AAC_SSR  = 2;
  FF_PROFILE_AAC_LTP  = 3;

  FF_PROFILE_DTS         = 20;
  FF_PROFILE_DTS_ES      = 30;
  FF_PROFILE_DTS_96_24   = 40;
  FF_PROFILE_DTS_HD_HRA  = 50;
  FF_PROFILE_DTS_HD_MA   = 60;
  FF_PROFILE_MPEG2_422   =  0;
  FF_PROFILE_MPEG2_HIGH  =  1;
  FF_PROFILE_MPEG2_SS    =  2;
  FF_PROFILE_MPEG2_SNR_SCALABLE = 3;
  FF_PROFILE_MPEG2_MAIN  =  4;
  FF_PROFILE_MPEG2_SIMPLE=  5;
  FF_PROFILE_H264_CONSTRAINED  = (1<<9);  // 8+1; constraint_set1_flag
  FF_PROFILE_H264_INTRA        = (1<<11); // 8+3; constraint_set3_flag
  FF_PROFILE_H264_BASELINE             = 66;
  FF_PROFILE_H264_CONSTRAINED_BASELINE = (66 or FF_PROFILE_H264_CONSTRAINED);
  FF_PROFILE_H264_MAIN                 = 77;
  FF_PROFILE_H264_EXTENDED             = 88;
  FF_PROFILE_H264_HIGH                 = 100;
  FF_PROFILE_H264_HIGH_10              = 110;
  FF_PROFILE_H264_HIGH_10_INTRA        = (110 or FF_PROFILE_H264_INTRA);
  FF_PROFILE_H264_HIGH_422             = 122;
  FF_PROFILE_H264_HIGH_422_INTRA       = (122 or FF_PROFILE_H264_INTRA);
  FF_PROFILE_H264_HIGH_444             = 144;
  FF_PROFILE_H264_HIGH_444_PREDICTIVE  = 244;
  FF_PROFILE_H264_HIGH_444_INTRA       = (244 or FF_PROFILE_H264_INTRA);
  FF_PROFILE_H264_CAVLC_444            = 44;
  FF_PROFILE_VC1_SIMPLE   = 0;
  FF_PROFILE_VC1_MAIN     = 1;
  FF_PROFILE_VC1_COMPLEX  = 2;
  FF_PROFILE_VC1_ADVANCED = 3;

  FF_LEVEL_UNKNOWN    = -99;

  X264_PART_I4X4 = $001;  (* Analyse i4x4 *)
  X264_PART_I8X8 = $002;  (* Analyse i8x8 (requires 8x8 transform) *)
  X264_PART_P8X8 = $010;  (* Analyse p16x8, p8x16 and p8x8 *)
  X264_PART_P4X4 = $020;  (* Analyse p8x4, p4x8, p4x4 *)
  X264_PART_B8X8 = $100;  (* Analyse b16x8, b8x16 and b8x8 *)

  FF_COMPRESSION_DEFAULT = -1;

  FF_THREAD_FRAME   = 1; //< Decode more than one frame at once
  FF_THREAD_SLICE   = 2; //< Decode more than one part of a single frame at once

  AVPALETTE_SIZE = 1024;
  AVPALETTE_COUNT = 256;

type
  PAVPacket = ^TAVPacket;
  TAVPacket = record
(*
 * Presentation timestamp in AVStream->time_base units; the time at which
 * the decompressed packet will be presented to the user.
 * Can be AV_NOPTS_VALUE if it is not stored in the file.
 * pts MUST be larger or equal to dts as presentation cannot happen before
 * decompression, unless one wants to view hex dumps. Some formats misuse
 * the terms dts and pts/cts to mean something different. Such timestamps
 * must be converted to true pts/dts before they are stored in AVPacket.
 *)
    pts:          cint64;
(*
 * Decompression timestamp in AVStream->time_base units; the time at which
 * the packet is decompressed.
 * Can be AV_NOPTS_VALUE if it is not stored in the file.
 *)
    dts:          cint64;
    data:         PByteArray;
    size:         cint;
    stream_index: cint;
    flags:        cint;
(*
 * Duration of this packet in AVStream->time_base units, 0 if unknown.
 * Equals next_pts - this_pts in presentation order.
 *)
    duration:     cint;
    destruct:     procedure (para1: PAVPacket); cdecl;
    priv:         pointer;
    pos:          cint64;       // byte position in stream, -1 if unknown

(*
 * Time difference in AVStream->time_base units from the pts of this
 * packet to the point at which the output from the decoder has converged
 * independent from the availability of previous frames. That is, the
 * frames are virtually identical no matter if decoding started from
 * the very first frame or from this keyframe.
 * Is AV_NOPTS_VALUE if unknown.
 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
 * set.
 *
 * The purpose of this field is to allow seeking in streams that have no
 * keyframes in the conventional sense. It corresponds to the
 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
 * essential for some types of subtitle streams to ensure that all
 * subtitles are correctly displayed after seeking.
 *)
    convergence_duration: cint64;
  end; {TAVPacket}

const
  AV_PKT_FLAG_KEY = $0001;
{$IF LIBAVCODEC_VERSION_MAJOR < 53}
  PKT_FLAG_KEY = AV_PKT_FLAG_KEY;
{$IFEND}
    
type
  PAVCodecContext = ^TAVCodecContext;

  (**
   * Audio Video Frame.
   * New fields can be added to the end of FF_COMMON_FRAME with minor version
   * bumps.
   * Removal, reordering and changes to existing fields require a major
   * version bump. No fields should be added into AVFrame before or after
   * FF_COMMON_FRAME!
   * sizeof(AVFrame) must not be used outside libav*.
   *)
  PAVFrame = ^TAVFrame;
  TAVFrame = record
    (**
     * pointer to the picture planes.
     * This might be different from the first allocated byte
     * - encoding:
     * - decoding:
     *)
    data: array [0..3] of pbyte;
    linesize: array [0..3] of cint;
    (**
     * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
     * This isn't used by libavcodec unless the default get/release_buffer() is used.
     * - encoding:
     * - decoding:
     *)
    base: array [0..3] of pbyte;
    (**
     * 1 -> keyframe, 0-> not
     * - encoding: Set by libavcodec.
     * - decoding: Set by libavcodec.
     *)
    key_frame: cint;
    (**
     * Picture type of the frame, see ?_TYPE below.
     * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
     * - decoding: Set by libavcodec.
     *)
    pict_type: TAVPictureType;
    (**
     * presentation timestamp in time_base units (time when frame should be shown to user)
     * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
     * - encoding: MUST be set by user.
     * - decoding: Set by libavcodec.
     *)
    pts: cint64;
    (**
     * picture number in bitstream order
     * - encoding: set by
     * - decoding: Set by libavcodec.
     *)
    coded_picture_number: cint;
    (**
     * picture number in display order
     * - encoding: set by
     * - decoding: Set by libavcodec.
     *)
    display_picture_number: cint;

    (**
     * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
     * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
     * - decoding: Set by libavcodec.
     *)
    quality: cint;

    (**
     * buffer age (1->was last buffer and dint change, 2->..., ...).
     * Set to INT_MAX if the buffer has not been used yet.
     * - encoding: unused
     * - decoding: MUST be set by get_buffer().
     *)
    age: cint;

    (**
     * is this picture used as reference
     * The values for this are the same as the MpegEncContext.picture_structure
     * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
     * Set to 4 for delayed, non-reference frames.
     * - encoding: unused
     * - decoding: Set by libavcodec. (before get_buffer() call)).
     *)
    reference: cint;

    (**
     * QP table
     * - encoding: unused
     * - decoding: Set by libavcodec.
     *)
    qscale_table: PShortint;

    (**
     * QP store stride
     * - encoding: unused
     * - decoding: Set by libavcodec.
     *)
    qstride: cint;

    (**
     * mbskip_table[mb]>=1 if MB didn't change
     * stride= mb_width = (width+15)>>4
     * - encoding: unused
     * - decoding: Set by libavcodec.
     *)
    mbskip_table: pbyte;

    (**
     * motion vector table
     * @code
     * example:
     * int mv_sample_log2= 4 - motion_subsample_log2;
     * int mb_width= (width+15)>>4;
     * int mv_stride= (mb_width << mv_sample_log2) + 1;
     * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
     * @endcode
     * - encoding: Set by user.
     * - decoding: Set by libavcodec.
     *)
    //int16_t (*motion_val[2])[2];
    motion_val: array [0..1] of pointer;

    (**
     * macroblock type table
     * mb_type_base + mb_width + 2
     * - encoding: Set by user.
     * - decoding: Set by libavcodec.
     *)
    mb_type: PCuint;

    (**
     * log2 of the size of the block which a single vector in motion_val represents:
     * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
     * - encoding: unused
     * - decoding: Set by libavcodec.
     *)
    motion_subsample_log2: byte;

    (**
     * for some private data of the user
     * - encoding: unused
     * - decoding: Set by user.
     *)
    opaque: pointer;

    (**
     * error
     * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
     * - decoding: unused
     *)
    error: array [0..3] of cuint64;

    (**
     * type of the buffer (to keep track of who has to deallocate data[*])
     * - encoding: Set by the one who allocates it.
     * - decoding: Set by the one who allocates it.
     * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
     *)
    type_: cint;

    (**
     * When decoding, this signals how much the picture must be delayed.
     * extra_delay = repeat_pict / (2*fps)
     * - encoding: unused
     * - decoding: Set by libavcodec.
     *)
    repeat_pict: cint;

    (**
     *
     *)
    qscale_type: cint;

    (**
     * The content of the picture is interlaced.
     * - encoding: Set by user.
     * - decoding: Set by libavcodec. (default 0)
     *)
    interlaced_frame: cint;

    (**
     * If the content is interlaced, is top field displayed first.
     * - encoding: Set by user.
     * - decoding: Set by libavcodec.
     *)
    top_field_first: cint;

    (**
     * Pan scan.
     * - encoding: Set by user.
     * - decoding: Set by libavcodec.
     *)
    pan_scan: PAVPanScan;

    (**
     * Tell user application that palette has changed from previous frame.
     * - encoding: ??? (no palette-enabled encoder yet)
     * - decoding: Set by libavcodec. (default 0).
     *)
    palette_has_changed: cint;

    (**
     * codec suggestion on buffer type if != 0
     * - encoding: unused
     * - decoding: Set by libavcodec. (before get_buffer() call)).
     *)
    buffer_hints: cint;

    (**
     * DCT coefficients
     * - encoding: unused
     * - decoding: Set by libavcodec.
     *)
    dct_coeff: PsmallInt;

    (**
     * motion reference frame index
     * the order in which these are stored can depend on the codec.
     * - encoding: Set by user.
     * - decoding: Set by libavcodec.
     *)
    ref_index: array [0..1] of PShortint;

    (**
     * reordered opaque 64bit number (generally a PTS) from AVCodecContext.reordered_opaque
     * PTS but can be anything). 
     * The user sets AVCodecContext.reordered_opaque to represent the input at
     * that time,
     * the decoder reorders values as needed and sets AVFrame.reordered_opaque
     * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque 
     * @deprecated in favor of pkt_pts
     * - encoding: unused
     * - decoding: Read by user.
     *)
    reordered_opaque: cint64;
    
    (**
     * hardware accelerator private data (FFmpeg allocated)
     * - encoding: unused
     * - decoding: Set by libavcodec
     *)
    hwaccel_picture_private: pointer;

    (**
     * reordered pts from the last AVPacket that has been input into the decoder
     * - encoding: unused
     * - decoding: Read by user.
     *)
     pkt_pts: cint64;

    (**
     * dts from the last AVPacket that has been input into the decoder
     * - encoding: unused
     * - decoding: Read by user.
     *)
     pkt_dts: cint64;

    (**
     * the AVCodecContext which ff_thread_get_buffer() was last called on
     * - encoding: Set by libavcodec.
     * - decoding: Set by libavcodec.
     *)
     owner: PAVCodecContext;

    (**
     * used by multithreading to store frame-specific info
     * - encoding: Set by libavcodec.
     * - decoding: Set by libavcodec.
     *)
     thread_opaque: pointer;

    (**
     * frame timestamp estimated using various heuristics, in stream time base
     * - encoding: unused
     * - decoding: set by libavcodec, read by user.
     *)
     best_effort_timestamp: cint64;

    (**
     * reordered pos from the last AVPacket that has been input into the decoder
     * - encoding: unused
     * - decoding: Read by user.
     *)
     pkt_pos: cint64;

    (**
     * reordered sample aspect ratio for the video frame, 0/1 if unknown\unspecified
     * - encoding: unused
     * - decoding: Read by user.
     *)
     sample_aspect_ratio: TAVRational;

    (**
     * width and height of the video frame
     * - encoding: unused
     * - decoding: Read by user.
     *)
     width, height: cint;

    (**
     * format of the frame, -1 if unknown or unset
     * It should be cast to the corresponding enum (enum PixelFormat
     * for video, enum AVSampleFormat for audio)
     * - encoding: unused
     * - decoding: Read by user.
     *)
     format: cint;
  end; {TAVFrame}

  PAVClass = ^TAVClass;

  PAVCodec = ^TAVCodec;

  PAVHWAccel = ^TAVHWAccel;

  // int[4]
  PQuadIntArray = ^TQuadIntArray;
  TQuadIntArray = array [0..3] of cint;
  // int (*func)(struct AVCodecContext *c2, void *arg)
  TExecuteFunc = function(c2: PAVCodecContext; arg: Pointer): cint; cdecl;
  // int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr)
  TExecute2Func = function(c2: PAVCodecContext; arg: Pointer; jobnr: cint; threadnr: cint): cint; cdecl;
  
{$IF FF_API_PALETTE_CONTROL}
(**
 * AVPaletteControl
 * This structure defines a method for communicating palette changes
 * between and demuxer and a decoder.
 *
 * @deprecated Use AVPacket to send palette changes instead.
 * This is totally broken.
 *)
  PAVPaletteControl = ^TAVPaletteControl;
  TAVPaletteControl = record
    (* demuxer sets this to 1 to indicate the palette has changed;
     * decoder resets to 0 *)
    palette_changed: cint;

    (* 4-byte ARGB palette entries, stored in native byte order; note that
     * the individual palette components should be on a 8-bit scale; if
     * the palette data comes from a IBM VGA native format, the component
     * data is probably 6 bits in size and needs to be scaled *)
    palette: array [0..AVPALETTE_COUNT - 1] of cuint;
  end; {deprecated;}
{$IFEND}

  (**
   * main external API structure.
   * New fields can be added to the end with minor version bumps.
   * Removal, reordering and changes to existing fields require a major
   * version bump.
   * sizeof(AVCodecContext) must not be used outside libav*.
   *)
  TAVCodecContext = record {720}
    (**
     * information on struct for av_log
     * - set by avcodec_alloc_context
     *)
    av_class: PAVClass;
    (**
     * the average bitrate
     * - encoding: Set by user; unused for constant quantizer encoding.
     * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
     *)
    bit_rate: cint;

    (**
     * number of bits the bitstream is allowed to diverge from the reference.
     *           the reference can be CBR (for CBR pass1) or VBR (for pass2)
     * - encoding: Set by user; unused for constant quantizer encoding.
     * - decoding: unused
     *)
    bit_rate_tolerance: cint;

    (**
     * CODEC_FLAG_*.
     * - encoding: Set by user.
     * - decoding: Set by user.
     *)
    flags: cint;

    (**
     * Some codecs need additional format info. It is stored here.
     * If any muxer uses this then ALL demuxers/parsers AND encoders for the
     * specific codec MUST set it correctly otherwise stream copy breaks.
     * In general use of this field by muxers is not recommanded.
     * - encoding: Set by libavcodec.
     * - decoding: Set by libavcodec. (FIXME: Is this OK?)
     *)
    sub_id: cint;

    (**
     * Motion estimation algorithm used for video coding.
     * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
     * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
     * - encoding: MUST be set by user.
     * - decoding: unused
     *)
    me_method: cint;

    (**
     * some codecs need / can use extradata like Huffman tables.
     * mjpeg: Huffman tables
     * rv10: additional flags
     * mpeg4: global headers (they can be in the bitstream or here)
     * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
     * than extradata_size to avoid prolems if it is read with the bitstream reader.
     * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
     * - encoding: Set/allocated/freed by libavcodec.
     * - decoding: Set/allocated/freed by user.
     *)
    extradata: pbyte;
    extradata_size: cint;

    (**
     * This is the fundamental unit of time (in seconds) in terms
     * of which frame timestamps are represented. For fixed-fps content,
     * timebase should be 1/framerate and timestamp increments should be
     * identically 1.
     * - encoding: MUST be set by user.
     * - decoding: Set by libavcodec.
     *)
    time_base: TAVRational;

    (* video only *)
    (**
     * picture width / height.
     * - encoding: MUST be set by user.
     * - decoding: Set by libavcodec.
     * Note: For compatibility it is possible to set this instead of
     * coded_width/height before decoding.
     *)
    width, height: cint;

    (**
     * the number of pictures in a group of pictures, or 0 for intra_only
     * - encoding: Set by user.
     * - decoding: unused
     *)
    gop_size: cint;

    (**
     * Pixel format, see PIX_FMT_xxx.
     * May be set by the demuxer if known from headers.
     * May be overriden by the decoder if it knows better.
     * - encoding: Set by user.
     * - decoding: Set by user if known, overridden by libavcodec if known
     *)
    pix_fmt: TAVPixelFormat;

{$IF FF_API_RATE_EMU}
    (**
     * Frame rate emulation. If not zero, the lower layer (i.e. format handler)
     * has to read frames at native frame rate.
     * - encoding: Set by user.
     * - decoding: unused
     *)
    rate_emu: cint;
{$IFEND}

    (**
     * If non NULL, 'draw_horiz_band' is called by the libavcodec
     * decoder to draw a horizontal band. It improves cache usage. Not
     * all codecs can do that. You must check the codec capabilities
     * beforehand.
     * The function is also used by hardware acceleration APIs.
     * It is called at least once during frame decoding to pass
     * the data needed for hardware render.
     * In that mode instead of pixel data, AVFrame points to
     * a structure specific to the acceleration API. The application
     * reads the structure and can change some fields to indicate progress
     * or mark state.
     * - encoding: unused
     * - decoding: Set by user.
     * @param height the height of the slice
     * @param y the y position of the slice
     * @param type 1->top field, 2->bottom field, 3->frame
     * @param offset offset into the AVFrame.data from which the slice should be read
     *)
    draw_horiz_band: procedure (s: PAVCodecContext;
                                src: {const} PAVFrame; offset: PQuadIntArray;
                                y: cint; type_: cint; height: cint); cdecl;

    (* audio only *)
    sample_rate: cint; ///< samples per second
    channels: cint;    ///< number of audio channels
    
    (**
     * audio sample format
     * - encoding: Set by user.
     * - decoding: Set by libavcodec.
     *)
    sample_fmt: TAVSampleFormat;  ///< sample format

    (* The following data should not be initialized. *)
    (**
     * Samples per packet, initialized when calling 'init'.
     *)
    frame_size: cint;
    frame_number: cint;   ///< audio or video frame number
{$IF LIBAVCODEC_MAX_VERSION_MAJOR < 53}
    real_pict_num: cint;  ///< returns the real picture number of previous encoded frame
{$IFEND}

    (**
     * Number of frames the decoded output will be delayed relative to
     * the encoded input.
     * - encoding: Set by libavcodec.
     * - decoding: unused
     *)
    delay: cint;

    (* - encoding parameters *)
    qcompress: cfloat;  ///< amount of qscale change between easy & hard scenes (0.0-1.0)
    qblur: cfloat;      ///< amount of qscale smoothing over time (0.0-1.0)

    (**
     * minimum quantizer
     * - encoding: Set by user.
     * - decoding: unused
     *)
    qmin: cint;

   (**
     * maximum quantizer
     * - encoding: Set by user.
     * - decoding: unused
     *)
   qmax: cint;

    (**
     * maximum quantizer difference between frames
     * - encoding: Set by user.
     * - decoding: unused
     *)
    max_qdiff: cint;

    (**
     * maximum number of B-frames between non-B-frames
     * Note: The output will be delayed by max_b_frames+1 relative to the input.
     * - encoding: Set by user.
     * - decoding: unused
     *)
    max_b_frames: cint;

    (**
     * qscale factor between IP and B-frames
     * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
     * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
     * - encoding: Set by user.
     * - decoding: unused
     *)
    b_quant_factor: cfloat;

    (** obsolete FIXME remove *)
    rc_strategy: cint;

    b_frame_strategy: cint;

{$IF FF_API_HURRY_UP}
    (**
     * hurry up amount
     * - encoding: unused
     * - decoding: Set by user. 1-> Skip B-frames, 2-> Skip IDCT/dequant too, 5-> Skip everything except header
     * @deprecated Deprecated in favor of skip_idct and skip_frame.
     *)
    hurry_up: cint;
{$IFEND}

    codec: PAVCodec;

    priv_data: pointer;

    rtp_payload_size: cint;     (* The size of the RTP payload: the coder will  *)
                                (* do it's best to deliver a chunk with size    *)
                                (* below rtp_payload_size, the chunk will start *)
                                (* with a start code on some codecs like H.263  *)
                                (* This doesn't take account of any particular  *)
                                (* headers inside the transmited RTP payload    *)


    (* The RTP callback: This function is called   *)
    (* every time the encoder has a packet to send *)
    (* Depends on the encoder if the data starts   *)
    (* with a Start Code (it should) H.263 does.   *)
    (* mb_nb contains the number of macroblocks    *)
    (* encoded in the RTP payload                  *)
    rtp_callback: procedure (avctx: PAVCodecContext; data: pointer;
                             size: cint; mb_nb: cint); cdecl;

    (* statistics, used for 2-pass encoding *)
    mv_bits: cint;
    header_bits: cint;
    i_tex_bits: cint;
    p_tex_bits: cint;
    i_count: cint;
    p_count: cint;
    skip_count: cint;
    misc_bits: cint;

    (**
     * number of bits used for the previously encoded frame
     * - encoding: Set by libavcodec.
     * - decoding: unused
     *)
    frame_bits: cint;

    (**
     * Private data of the user, can be used to carry app specific stuff.
     * - encoding: Set by user.
     * - decoding: Set by user.
     *)
    opaque: pointer;

    codec_name: array [0..31] of AnsiChar;
    codec_type: TAVMediaType; (* see AVMEDIA_TYPE_xxx *)
    codec_id: TCodecID; (* see CODEC_ID_xxx *)

    (**
     * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
     * This is used to work around some encoder bugs.
     * A demuxer should set this to what is stored in the field used to identify the codec.
     * If there are multiple such fields in a container then the demuxer should choose the one
     * which maximizes the information about the used codec.
     * If the codec tag field in a container is larger then 32 bits then the demuxer should
     * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
     * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
     * first.
     * - encoding: Set by user, if not then the default based on codec_id will be used.
     * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
     *)
    codec_tag: cuint;

    (**
     * Work around bugs in encoders which sometimes cannot be detected automatically.
     * - encoding: Set by user
     * - decoding: Set by user
     *)
    workaround_bugs: cint;

    (**
     * luma single coefficient elimination threshold
     * - encoding: Set by user.
     * - decoding: unused
     *)
    luma_elim_threshold: cint;

    (**
     * chroma single coeff elimination threshold
     * - encoding: Set by user.
     * - decoding: unused
     *)
    chroma_elim_threshold: cint;

    (**
     * strictly follow the standard (MPEG4, ...).
     * - encoding: Set by user.
     * - decoding: Set by user.
     * Setting this to STRICT or higher means the encoder and decoder will
     * generally do stupid things, whereas setting it to unofficial or lower
     * will mean the encoder might produce output that is not supported by all
     * spec-compliant decoders. Decoders don't differentiate between normal,
     * unofficial and experimental (that is, they always try to decode things
     * when they can) unless they are explicitly asked to behave stupidly
     * (=strictly conform to the specs)
     *)
    strict_std_compliance: cint;

    (**
     * qscale offset between IP and B-frames
     * - encoding: Set by user.
     * - decoding: unused
     *)
    b_quant_offset: cfloat;

    (**
     * Error recognization; higher values will detect more errors but may
     * misdetect some more or less valid parts as errors.
     * - encoding: unused
     * - decoding: Set by user.
     *)
    error_recognition: cint;

    (**
     * Called at the beginning of each frame to get a buffer for it.
     * If pic.reference is set then the frame will be read later by libavcodec.
     * avcodec_align_dimensions2() should be used to find the required width and
     * height, as they normally need to be rounded up to the next multiple of 16.
     * if CODEC_CAP_DR1 is not set then get_buffer() must call
     * avcodec_default_get_buffer() instead of providing buffers allocated by
     * some other means.
     * - encoding: unused
     * - decoding: Set by libavcodec, user can override.
     *)
    get_buffer: function (c: PAVCodecContext; pic: PAVFrame): cint; cdecl;

    (**
     * Called to release buffers which were allocated with get_buffer.
     * A released buffer can be reused in get_buffer().
     * pic.data[*] must be set to NULL.
     * - encoding: unused
     * - decoding: Set by libavcodec, user can override.
     *)
    release_buffer: procedure (c: PAVCodecContext; pic: PAVFrame); cdecl;

    (**
     * Size of the frame reordering buffer in the decoder.
     * For MPEG-2 it is 1 IPB or 0 low delay IP.
     * - encoding: Set by libavcodec.
     * - decoding: Set by libavcodec.
     *)
    has_b_frames: cint;

    (**
     * number of bytes per packet if constant and known or 0
     * Used by some WAV based audio codecs.
     *)
    block_align: cint;

    parse_only: cint; (* - decoding only: if true, only parsing is done
                       (function avcodec_parse_frame()). The frame
                       data is returned. Only MPEG codecs support this now. *)

    (**
     * 0-> h263 quant 1-> mpeg quant
     * - encoding: Set by user.
     * - decoding: unused
     *)
    mpeg_quant: cint;

    (**
     * pass1 encoding statistics output buffer
     * - encoding: Set by libavcodec.
     * - decoding: unused
     *)
    stats_out: PAnsiChar;

    (**
     * pass2 encoding statistics input buffer
     * Concatenated stuff from stats_out of pass1 should be placed here.
     * - encoding: Allocated/set/freed by user.
     * - decoding: unused
     *)
    stats_in: PAnsiChar;

    (**
     * ratecontrol qmin qmax limiting method
     * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
     * - encoding: Set by user.
     * - decoding: unused
     *)
    rc_qsquish: cfloat;

    rc_qmod_amp: cfloat;
    rc_qmod_freq: cint;

    (**
     * ratecontrol override, see RcOverride
     * - encoding: Allocated/set/freed by user.
     * - decoding: unused
     *)
    rc_override: PRcOverride;
    rc_override_count: cint;

    (**
     * rate control equation
     * - encoding: Set by user
     * - decoding: unused
     *)
    rc_eq: {const} PAnsiChar; 

    (**
     * maximum bitrate
     * - encoding: Set by user.
     * - decoding: unused
     *)
    rc_max_rate: cint;

    (**
     * minimum bitrate
     * - encoding: Set by user.
     * - decoding: unused
     *)
    rc_min_rate: cint;

    (**
     * decoder bitstream buffer size
     * - encoding: Set by user.
     * - decoding: unused
     *)
    rc_buffer_size: cint;
    rc_buffer_aggressivity: cfloat;

    (**
     * qscale factor between P and I-frames
     * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
     * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
     * - encoding: Set by user.
     * - decoding: unused
     *)
    i_quant_factor: cfloat;

    (**
     * qscale offset between P and I-frames
     * - encoding: Set by user.
     * - decoding: unused
     *)
    i_quant_offset: cfloat;

    (**
     * initial complexity for pass1 ratecontrol
     * - encoding: Set by user.
     * - decoding: unused
     *)
    rc_initial_cplx: cfloat;

    (**
     * DCT algorithm, see FF_DCT_* below
     * - encoding: Set by user.
     * - decoding: unused
     *)
    dct_algo: cint;

    (**
     * luminance masking (0-> disabled)
     * - encoding: Set by user.
     * - decoding: unused
     *)
    lumi_masking: cfloat;

    (**
     * temporary complexity masking (0-> disabled)
     * - encoding: Set by user.
     * - decoding: unused
     *)
    temporal_cplx_masking: cfloat;

    (**
     * spatial complexity masking (0-> disabled)
     * - encoding: Set by user.
     * - decoding: unused
     *)
    spatial_cplx_masking: cfloat;

    (**
     * p block masking (0-> disabled)
     * - encoding: Set by user.
     * - decoding: unused
     *)
    p_masking: cfloat;

    (**
     * darkness masking (0-> disabled)
     * - encoding: Set by user.
     * - decoding: unused
     *)
    dark_masking: cfloat;

    (**
     * IDCT algorithm, see FF_IDCT_* below.
     * - encoding: Set by user.
     * - decoding: Set by user.
     *)
    idct_algo: cint;

    (**
     * slice count
     * - encoding: Set by libavcodec.
     * - decoding: Set by user (or 0).
     *)
    slice_count: cint;

    (**
     * slice offsets in the frame in bytes
     * - encoding: Set/allocated by libavcodec.
     * - decoding: Set/allocated by user (or NULL).
     *)
    slice_offset: PCint;

    (**
     * error concealment flags
     * - encoding: unused
     * - decoding: Set by user.
     *)
    error_concealment: cint;

    (**
     * dsp_mask could be add used to disable unwanted CPU features
     * CPU features (i.e. MMX, SSE. ...)
     *
     * With the FORCE flag you may instead enable given CPU features.
     * (Dangerous: Usable in case of misdetection, improper usage however will
     * result into program crash.)
     *)
    dsp_mask: cuint;

    (**
     * bits per sample/pixel from the demuxer (needed for huffyuv).
     * - encoding: Set by libavcodec.
     * - decoding: Set by user.
     *)
     bits_per_coded_sample: cint;

    (**
     * prediction method (needed for huffyuv)
     * - encoding: Set by user.
     * - decoding: unused
     *)
     prediction_method: cint;

    (**
     * sample aspect ratio (0 if unknown)
     * That is the width of a pixel divided by the height of the pixel.
     * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
     * - encoding: Set by user.
     * - decoding: Set by libavcodec.
     *)
    sample_aspect_ratio: TAVRational;

    (**
     * the picture in the bitstream
     * - encoding: Set by libavcodec.
     * - decoding: Set by libavcodec.
     *)
    coded_frame: PAVFrame;

    (**
     * debug
     * - encoding: Set by user.
     * - decoding: Set by user.
     *)
    debug: cint;

    (**
     * debug
     * - encoding: Set by user.
     * - decoding: Set by user.
     *)
    debug_mv: cint;

    (**
     * error
     * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
     * - decoding: unused
     *)
    error: array [0..3] of cuint64;

{$IF FF_API_MB_Q}
    (**
     * minimum MB quantizer
     * - encoding: unused
     * - decoding: unused
     *)
    mb_qmin: cint; {deprecated}

    (**
     * maximum MB quantizer
     * - encoding: unused
     * - decoding: unused
     *)
    mb_qmax: cint; {deprecated}
{$IFEND}

    (**
     * motion estimation comparison function
     * - encoding: Set by user.
     * - decoding: unused
     *)
    me_cmp: cint;

    (**
     * subpixel motion estimation comparison function
     * - encoding: Set by user.
     * - decoding: unused
     *)
    me_sub_cmp: cint;
    (**
     * macroblock comparison function (not supported yet)
     * - encoding: Set by user.
     * - decoding: unused
     *)
    mb_cmp: cint;
    (**
     * interlaced DCT comparison function
     * - encoding: Set by user.
     * - decoding: unused
     *)
    ildct_cmp: cint;

    (**
     * ME diamond size & shape
     * - encoding: Set by user.
     * - decoding: unused
     *)
    dia_size: cint;

    (**
     * amount of previous MV predictors (2a+1 x 2a+1 square)
     * - encoding: Set by user.
     * - decoding: unused
     *)
    last_predictor_count: cint;

    (**
     * prepass for motion estimation
     * - encoding: Set by user.
     * - decoding: unused
     *)
    pre_me: cint;

    (**
     * motion estimation prepass comparison function
     * - encoding: Set by user.
     * - decoding: unused
     *)
    me_pre_cmp: cint;

    (**
     * ME prepass diamond size & shape
     * - encoding: Set by user.
     * - decoding: unused
     *)
    pre_dia_size: cint;

    (**
     * subpel ME quality
     * - encoding: Set by user.
     * - decoding: unused
     *)
    me_subpel_quality: cint;

    (**
     * callback to negotiate the pixelFormat
     * @param fmt is the list of formats which are supported by the codec,
     * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
     * The first is always the native one.
     * @return the chosen format
     * - encoding: unused
     * - decoding: Set by user, if not set the native format will be chosen.
     *)
    get_format: function (s: PAVCodecContext; fmt: {const} PAVPixelFormat): TAVPixelFormat; cdecl;

    (**
     * DTG active format information (additional aspect ratio
     * information only used in DVB MPEG-2 transport streams)
     * 0 if not set.
     *
     * - encoding: unused
     * - decoding: Set by decoder.
     *)
    dtg_active_format: cint;

    (**
     * maximum motion estimation search range in subpel units
     * If 0 then no limit.
     *
     * - encoding: Set by user.
     * - decoding: unused
     *)
    me_range: cint;

    (**
     * intra quantizer bias
     * - encoding: Set by user.
     * - decoding: unused
     *)
    intra_quant_bias: cint;

    (**
     * inter quantizer bias
     * - encoding: Set by user.
     * - decoding: unused
     *)
    inter_quant_bias: cint;

    (**
     * color table ID
     * - encoding: unused
     * - decoding: Which clrtable should be used for 8bit RGB images.
     *             Tables have to be stored somewhere. FIXME
     *)
    color_table_id: cint;

    (**
     * internal_buffer count
     * Don't touch, used by libavcodec default_get_buffer().
     *)
    internal_buffer_count: cint;

    (**
     * internal_buffers
     * Don't touch, used by libavcodec default_get_buffer().
     *)
    internal_buffer: pointer;

    (**
     * Global quality for codecs which cannot change it per frame.
     * This should be proportional to MPEG-1/2/4 qscale.
     * - encoding: Set by user.
     * - decoding: unused
     *)
    global_quality: cint;

    (**
     * coder type
     * - encoding: Set by user.
     * - decoding: unused
     *)
    coder_type: cint;

    (**
     * context model
     * - encoding: Set by user.
     * - decoding: unused
     *)
    context_model: cint;

    {
    (**
     *
     * - encoding: unused
     * - decoding: Set by user.
     *)
    realloc: function (s: PAVCodecContext; buf: Pbyte; buf_size: cint): Pbyte; cdecl;
    }

    (**
     * slice flags
     * - encoding: unused
     * - decoding: Set by user.
     *)
    slice_flags: cint;

    (**
     * XVideo Motion Acceleration
     * - encoding: forbidden
     * - decoding: set by decoder
     *)
    xvmc_acceleration: cint;

    (**
     * macroblock decision mode
     * - encoding: Set by user.
     * - decoding: unused
     *)
    mb_decision: cint;

    (**
     * custom intra quantization matrix
     * - encoding: Set by user, can be NULL.
     * - decoding: Set by libavcodec.
     *)
    intra_matrix: PWord;

    (**
     * custom inter quantization matrix
     * - encoding: Set by user, can be NULL.
     * - decoding: Set by libavcodec.
     *)
    inter_matrix: PWord;

    (**
     * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
     * This is used to work around some encoder bugs.
     * - encoding: unused
     * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
     *)
    stream_codec_tag: array [0..3] of AnsiChar; //cuint;

    (**
     * scene change detection threshold
     * 0 is default, larger means fewer detected scene changes.
     * - encoding: Set by user.
     * - decoding: unused
     *)
    scenechange_threshold: cint;

    (**
     * minimum Lagrange multipler
     * - encoding: Set by user.
     * - decoding: unused
     *)
    lmin: cint;

    (**
     * maximum Lagrange multipler
     * - encoding: Set by user.
     * - decoding: unused
     *)
    lmax: cint;

{$IF FF_API_PALETTE_CONTROL}
    (**
     * palette control structure
     * - encoding: ??? (no palette-enabled encoder yet)
     * - decoding: Set by user.
     *)
    palctrl: PAVPaletteControl;
{$IFEND}

    (**
     * noise reduction strength
     * - encoding: Set by user.
     * - decoding: unused
     *)
    noise_reduction: cint;

    (**
     * Called at the beginning of a frame to get cr buffer for it.
     * Buffer type (size, hints) must be the same. libavcodec won't check it.
     * libavcodec will pass previous buffer in pic, function should return
     * same buffer or new buffer with old frame "painted" into it.
     * If pic.data[0] == NULL must behave like get_buffer().
     * if CODEC_CAP_DR1 is not set then reget_buffer() must call
     * avcodec_default_reget_buffer() instead of providing buffers allocated by
     * some other means.
     * - encoding: unused
     * - decoding: Set by libavcodec, user can override
     *)
    reget_buffer: function (c: PAVCodecContext; pic: PAVFrame): cint; cdecl;

    (**
     * Number of bits which should be loaded into the rc buffer before decoding starts.
     * - encoding: Set by user.
     * - decoding: unused
     *)
    rc_initial_buffer_occupancy: cint;

    (**
     *
     * - encoding: Set by user.
     * - decoding: unused
     *)
    inter_threshold: cint;

    (**
     * CODEC_FLAG2_*
     * - encoding: Set by user.
     * - decoding: Set by user.
     *)
    flags2: cint;

    (**
     * Simulates errors in the bitstream to test error concealment.
     * - encoding: Set by user.
     * - decoding: unused
     *)
    error_rate: cint;

{$IF FF_API_ANTIALIAS_ALGO}
    (**
     * MP3 antialias algorithm, see FF_AA_* below.
     * - encoding: unused
     * - decoding: Set by user.
     *)
    antialias_algo: cint; {deprecated}
{$IFEND}

    (**
     * quantizer noise shaping
     * - encoding: Set by user.
     * - decoding: unused
     *)
    quantizer_noise_shaping: cint;

    (**
     * thread count
     * is used to decide how many independent tasks should be passed to execute()
     * - encoding: Set by user.
     * - decoding: Set by user.
     *)
    thread_count: cint;

    (**
     * The codec may call this to execute several independent things.
     * It will return only after finishing all tasks.
     * The user may replace this with some multithreaded implementation,
     * the default implementation will execute the parts serially.
     * @param count the number of things to execute
     * - encoding: Set by libavcodec, user can override.
     * - decoding: Set by libavcodec, user can override.
     *)
    execute: function (c: PAVCodecContext; func: TExecuteFunc; arg: Pointer; ret: PCint; count: cint; size: cint): cint; cdecl;

    (**
     * thread opaque
     * Can be used by execute() to store some per AVCodecContext stuff.
     * - encoding: set by execute()
     * - decoding: set by execute()
     *)
    thread_opaque: pointer;

    (**
     * Motion estimation threshold below which no motion estimation is
     * performed, but instead the user specified motion vectors are used.
     *
     * - encoding: Set by user.
     * - decoding: unused
     *)
     me_threshold: cint;

    (**
     * Macroblock threshold below which the user specified macroblock types will be used.
     * - encoding: Set by user.
     * - decoding: unused
     *)
     mb_threshold: cint;

    (**
     * precision of the intra DC coefficient - 8
     * - encoding: Set by user.
     * - decoding: unused
     *)
     intra_dc_precision: cint;

    (**
     * noise vs. sse weight for the nsse comparsion function
     * - encoding: Set by user.
     * - decoding: unused
     *)
     nsse_weight: cint;

    (**
     * Number of macroblock rows at the top which are skipped.
     * - encoding: unused
     * - decoding: Set by user.
     *)
     skip_top: cint;

    (**
     * Number of macroblock rows at the bottom which are skipped.
     * - encoding: unused
     * - decoding: Set by user.
     *)
     skip_bottom: cint;

    (**
     * profile
     * - encoding: Set by user.
     * - decoding: Set by libavcodec.
     *)
     profile: cint;

    (**
     * level
     * - encoding: Set by user.
     * - decoding: Set by libavcodec.
     *)
     level: cint;

    (**
     * low resolution decoding, 1-> 1/2 size, 2->1/4 size
     * - encoding: unused
     * - decoding: Set by user.
     *)
     lowres: cint;

    (**
     * Bitstream width / height, may be different from width/height if lowres
     * or other things are used.
     * - encoding: unused
     * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
     *)
    coded_width, coded_height: cint;

    (**
     * frame skip threshold
     * - encoding: Set by user.
     * - decoding: unused
     *)
    frame_skip_threshold: cint;

    (**
     * frame skip factor
     * - encoding: Set by user.
     * - decoding: unused
     *)
    frame_skip_factor: cint;

    (**
     * frame skip exponent
     * - encoding: Set by user.
     * - decoding: unused
     *)
    frame_skip_exp: cint;

    (**
     * frame skip comparison function
     * - encoding: Set by user.
     * - decoding: unused
     *)
    frame_skip_cmp: cint;

    (**
     * Border processing masking, raises the quantizer for mbs on the borders
     * of the picture.
     * - encoding: Set by user.
     * - decoding: unused
     *)
    border_masking: cfloat;

    (**
     * minimum MB lagrange multipler
     * - encoding: Set by user.
     * - decoding: unused
     *)
    mb_lmin: cint;

    (**
     * maximum MB lagrange multipler
     * - encoding: Set by user.
     * - decoding: unused
     *)
    mb_lmax: cint;

    (**
     *
     * - encoding: Set by user.
     * - decoding: unused
     *)
    me_penalty_compensation: cint;

    (**
     *
     * - encoding: unused
     * - decoding: Set by user.
     *)
    skip_loop_filter: TAVDiscard;

    (**
     *
     * - encoding: unused
     * - decoding: Set by user.
     *)
    skip_idct: TAVDiscard;

    (**
     *
     * - encoding: unused
     * - decoding: Set by user.
     *)
    skip_frame: TAVDiscard;

    (**
     *
     * - encoding: Set by user.
     * - decoding: unused
     *)
    bidir_refine: cint;

    (**
     *
     * - encoding: Set by user.
     * - decoding: unused
     *)
    brd_scale: cint;

    (**
     * constant rate factor - quality-based VBR - values ~correspond to qps
     * - encoding: Set by user.
     * - decoding: unused
     *)
    crf: cfloat;

    (**
     * constant quantization parameter rate control method
     * - encoding: Set by user.
     * - decoding: unused
     *)
    cqp: cint;

    (**
     * minimum GOP size
     * - encoding: Set by user.
     * - decoding: unused
     *)
    keyint_min: cint;

    (**
     * number of reference frames
     * - encoding: Set by user.
     * - decoding: Set by lavc.
     *)
    refs: cint;

    (**
     * chroma qp offset from luma
     * - encoding: Set by user.
     * - decoding: unused
     *)
    chromaoffset: cint;

    (**
     * Influences how often B-frames are used.
     * - encoding: Set by user.
     * - decoding: unused
     *)
    bframebias: cint;

    (**
     * trellis RD quantization
     * - encoding: Set by user.
     * - decoding: unused
     *)
    trellis: cint;

    (**
     * Reduce fluctuations in qp (before curve compression).
     * - encoding: Set by user.
     * - decoding: unused
     *)
    complexityblur: cfloat;

    (**
     * in-loop deblocking filter alphac0 parameter
     * alpha is in the range -6...6
     * - encoding: Set by user.
     * - decoding: unused
     *)
    deblockalpha: cint;

    (**
     * in-loop deblocking filter beta parameter
     * beta is in the range -6...6
     * - encoding: Set by user.
     * - decoding: unused
     *)
    deblockbeta: cint;

    (**
     * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
     * - encoding: Set by user.
     * - decoding: unused
     *)
    partitions: cint;

    (**
     * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
     * - encoding: Set by user.
     * - decoding: unused
     *)
    directpred: cint;

    (**
     * Audio cutoff bandwidth (0 means "automatic")
     * - encoding: Set by user.
     * - decoding: unused
     *)
    cutoff: cint;

    (**
     * Multiplied by qscale for each frame and added to scene_change_score.
     * - encoding: Set by user.
     * - decoding: unused
     *)
    scenechange_factor: cint;

    (**
     *
     * Note: Value depends upon the compare function used for fullpel ME.
     * - encoding: Set by user.
     * - decoding: unused
     *)
    mv0_threshold: cint;

    (**
     * Adjusts sensitivity of b_frame_strategy 1.
     * - encoding: Set by user.
     * - decoding: unused
     *)
    b_sensitivity: cint;

    (**
     * - encoding: Set by user.
     * - decoding: unused
     *)
    compression_level: cint;

{$IF FF_API_USE_LPC}
    (**
     * Sets whether to use LPC mode - used by FLAC encoder.
     * - encoding: Set by user.
     * - decoding: unused
     * @deprecated Deprecated in favor of lpc_type and lpc_passes.
     *)
    use_lpc: cint;

    (**
     * LPC coefficient precision - used by FLAC encoder
     * - encoding: Set by user.
     * - decoding: unused
     *)
    lpc_coeff_precision: cint;
{$IFEND}

    (**
     * - encoding: Set by user.
     * - decoding: unused
     *)
    min_prediction_order: cint;

    (**
     * - encoding: Set by user.
     * - decoding: unused
     *)
    max_prediction_order: cint;

{$IF FF_API_FLAC_GLOBAL_OPTS}
    (**
     * search method for selecting prediction order
     * - encoding: Set by user.
     * - decoding: unused
     *)
    prediction_order_method: cint; {deprecated}

    (**
     * - encoding: Set by user.
     * - decoding: unused
     *)
    min_partition_order: cint; {deprecated}

    (**
     * - encoding: Set by user.
     * - decoding: unused
     *)
    max_partition_order: cint; {deprecated}
{$IFEND}

    (**
     * GOP timecode frame start number, in non drop frame format
     * - encoding: Set by user.
     * - decoding: unused
     *)
    timecode_frame_start: cint64;

{$IF FF_API_REQUEST_CHANNELS}
    (**
     * Decoder should decode to this many channels if it can (0 for default)
     * - encoding: unused
     * - decoding: Set by user.
     * @deprecated Deprecated in favor of request_channel_layout.
     *)
    request_channels: cint;
{$IFEND}

    (**
     * Percentage of dynamic range compression to be applied by the decoder.
     * The default value is 1.0, corresponding to full compression.
     * - encoding: unused
     * - decoding: Set by user.
     *)
    drc_scale: cfloat;

    (**
     * opaque 64bit number (generally a PTS) that will be reordered and
     * output in AVFrame.reordered_opaque
     * - encoding: unused
     * - decoding: Set by user.
     *)
    reordered_opaque: cint64;
    
    (**
     * Bits per sample/pixel of internal libavcodec pixel/sample format.
     * This field is applicable only when sample_fmt is SAMPLE_FMT_S32.
     * - encoding: set by user.
     * - decoding: set by libavcodec.
     *)
    bits_per_raw_sample: cint;

    (**
     * Audio channel layout.
     * - encoding: set by user.
     * - decoding: set by libavcodec.
     *)
    channel_layout: cint64;

    (**
     * Request decoder to use this channel layout if it can (0 for default)
     * - encoding: unused
     * - decoding: Set by user.
     *)
    request_channel_layout: cint64;

    (**
     * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
     * - encoding: Set by user.
     * - decoding: unused.
     *)
    rc_max_available_vbv_use: cfloat;

    (**
     * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
     * - encoding: Set by user.
     * - decoding: unused.
     *)
    rc_min_vbv_overflow_use: cfloat;

    (**
     * Hardware accelerator in use
     * - encoding: unused.
     * - decoding: Set by libavcodec
     *)
    hwaccel: PAVHWAccel;

    (**
     * For some codecs, the time base is closer to the field rate than the frame rate.
     * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
     * if no telecine is used ...
     *
     * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
     *)
    ticks_per_frame: cint;

    (**
     * Hardware accelerator context.
     * For some hardware accelerators, a global context needs to be
     * provided by the user. In that case, this holds display-dependent
     * data FFmpeg cannot instantiate itself. Please refer to the
     * FFmpeg HW accelerator documentation to know how to fill this
     * is. e.g. for VA API, this is a struct vaapi_context.
     * - encoding: unused
     * - decoding: Set by user
     *)
    hwaccel_context: pointer;

    (**
     * Chromaticity coordinates of the source primaries.
     * - encoding: Set by user
     * - decoding: Set by libavcodec
     *)
    color_primaries: TAVColorPrimaries;

    (**
     * Color Transfer Characteristic.
     * - encoding: Set by user
     * - decoding: Set by libavcodec
     *)
    color_trc: TAVColorTransferCharacteristic;

    (**
     * YUV colorspace type.
     * - encoding: Set by user
     * - decoding: Set by libavcodec
     *)
    colorspace: TAVColorSpace;

    (**
     * MPEG vs JPEG YUV range.
     * - encoding: Set by user
     * - decoding: Set by libavcodec
     *)
    color_range: TAVColorRange;

    (**
     * This defines the location of chroma samples.
     * - encoding: Set by user
     * - decoding: Set by libavcodec
     *)
     chroma_sample_location: TAVChromaLocation;

    (**
     * The codec may call this to execute several independent things.
     * It will return only after finishing all tasks.
     * The user may replace this with some multithreaded implementation,
     * the default implementation will execute the parts serially.
     * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
     * @param c context passed also to func
     * @param count the number of things to execute
     * @param arg2 argument passed unchanged to func
     * @param ret return values of executed functions, must have space for "count" values. May be NULL.
     * @param func function that will be called count times, with jobnr from 0 to count-1.
     *             threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
     *             two instances of func executing at the same time will have the same threadnr.
     * @return always 0 currently, but code should handle a future improvement where when any call to func
     *         returns < 0 no further calls to func may be done and < 0 is returned.
     * - encoding: Set by libavcodec, user can override.
     * - decoding: Set by libavcodec, user can override.
     *)
      execute2: function (c: PAVCodecContext; func: TExecute2Func; arg2: Pointer; ret: Pcint; count: cint): cint; cdecl;

    (**
     * explicit P-frame weighted prediction analysis method
     * 0: off
     * 1: fast blind weighting (one reference duplicate with -1 offset)
     * 2: smart weighting (full fade detection analysis)
     * - encoding: Set by user.
     * - decoding: unused
     *)
    weighted_p_pred: cint;

    (**
     * AQ mode
     * 0: Disabled
     * 1: Variance AQ (complexity mask)
     * 2: Auto-variance AQ (experimental)
     * - encoding: Set by user
     * - decoding: unused
     *)
    aq_mode: cint;

    (**
     * AQ strength
     * Reduces blocking and blurring in flat and textured areas.
     * - encoding: Set by user
     * - decoding: unused
     *)
    aq_strength: cfloat;

    (**
     * PSY RD
     * Strength of psychovisual optimization
     * - encoding: Set by user
     * - decoding: unused
     *)
    psy_rd: cfloat;

    (**
     * PSY trellis
     * Strength of psychovisual optimization
     * - encoding: Set by user
     * - decoding: unused
     *)
    psy_trellis: cfloat;

    (**
     * RC lookahead
     * Number of frames for frametype and ratecontrol lookahead
     * - encoding: Set by user
     * - decoding: unused
     *)
    rc_lookahead: cint;

    (**
     * Constant rate factor maximum
     * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
     * than crf_max, even if doing so would violate VBV restrictions.
     * - encoding: Set by user.
     * - decoding: unused
     *)
    crf_max: cfloat;

    log_level_offset: cint;

{$IF FF_API_FLAC_GLOBAL_OPTS}
    (**
     * Determines which LPC analysis algorithm to use.
     * - encoding: Set by user
     * - decoding: unused
     *)
    lpc_type: TAVLPCType; {deprecated}

    (**
     * Number of passes to use for Cholesky factorization during LPC analysis
     * - encoding: Set by user
     * - decoding: unused
     *)
    lpc_passes: cint; {deprecated}
{$IFEND}

    (**
     * Number of slices.
     * Indicates number of picture subdivisions. Used for parallelized
     * decoding.
     * - encoding: Set by user
     * - decoding: unused
     *)
    slices: cint;

    (**
     * Header containing style information for text subtitles.
     * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
     * [Script Info] and [V4+ Styles] section, plus the [Events] line and
     * the Format line following. It shouldn't include any Dialogue line.
     * - encoding: Set/allocated/freed by user (before avcodec_open())
     * - decoding: Set/allocated/freed by libavcodec (by avcodec_open())
     *)
    subtitle_header: Pcuint8;
    subtitle_header_size: cint;

    (**
     * Current packet as passed into the decoder, to avoid having
     * to pass the packet into every function. Currently only valid
     * inside lavc and get/release_buffer callbacks.
     * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
     * - encoding: unused
     *)
    pkt: PAVPacket;

    (**
     * Whether this is a copy of the context which had init() called on it.
     * This is used by multithreading - shared tables and picture pointers
     * should be freed from the original context only.
     * - encoding: Set by libavcodec.
     * - decoding: Set by libavcodec.
     *)
    is_copy: cint;

    (**
     * Which multithreading methods to use.
     * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
     * so clients which cannot provide future frames should not use it.
     *
     * - encoding: Set by user, otherwise the default is used.
     * - decoding: Set by user, otherwise the default is used.
     *)
    thread_type: cint;

    (**
     * Which multithreading methods are in use by the codec.
     * - encoding: Set by libavcodec.
     * - decoding: Set by libavcodec.
     *)
    active_thread_type: cint;

    (**
     * Set by the client if its custom get_buffer() callback can be called
     * from another thread, which allows faster multithreaded decoding.
     * draw_horiz_band() will be called from other threads regardless of this setting.
     * Ignored if the default get_buffer() is used.
     * - encoding: Set by user.
     * - decoding: Set by user.
     *)
    thread_safe_callbacks: cint;

    (**
     * VBV delay coded in the last frame (in periods of a 27 MHz clock).
     * Used for compliant TS muxing.
     * - encoding: Set by libavcodec.
     * - decoding: unused.
     *)
    vbv_delay: cuint64;

    (**
     * Type of service that the audio stream conveys.
     * - encoding: Set by user.
     * - decoding: Set by libavcodec.
     *)
    audio_service_type: TAVAudioServiceType;

    (**
     * desired sample format
     * - encoding: Not used.
     * - decoding: Set by user.
     * Decoder will decode to this format if it can.
     *)
    request_sample_fmt: TAVSampleFormat;

    (**
     * Current statistics for PTS correction.
     * - decoding: maintained and used by libavcodec, not intended to be used by user apps
     * - encoding: unused
     *)
    pts_correction_num_faulty_pts: cint64; /// Number of incorrect PTS values so far
    pts_correction_num_faulty_dts: cint64; /// Number of incorrect DTS values so far
    pts_correction_last_pts: cint64;       /// PTS of the last frame
    pts_correction_last_dts: cint64;       /// DTS of the last frame

  end; {TAVCodecContext}

  (**
   * AVProfile.
   *)
  PAVProfile = ^TAVProfile;
  TAVProfile = record
    profile: cint;
    name: {const} PAnsiChar; ///< short name for the profile
  end; {TAVProfile}

(**
 * AVCodec.
 *)
  TAVCodec = record
    name: PAnsiChar;
    type_: TAVMediaType;
    id: TCodecID;
    priv_data_size: cint;
    init: function (avctx: PAVCodecContext): cint; cdecl;
    encode: function (avctx: PAVCodecContext; buf: PByteArray; buf_size: cint; data: pointer): cint; cdecl;
    close: function (avctx: PAVCodecContext): cint; cdecl;
    decode: function (avctx: PAVCodecContext; outdata: pointer; var outdata_size: cint; avpkt: PAVPacket): cint; cdecl;
    (**
     * Codec capabilities.
     * see CODEC_CAP_*
     *)
    capabilities: cint;
    next: PAVCodec;
    (**
     * Flush buffers.
     * Will be called when seeking
     *)
    flush: procedure (avctx: PAVCodecContext); cdecl;
    supported_framerates: {const} PAVRational; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
    pix_fmts: {const} PAVPixelFormat;       ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
    (**
     * Descriptive name for the codec, meant to be more human readable than name.
     * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
     *)
    long_name: {const} PAnsiChar;
    supported_samplerates: {const} PCint;      ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
    sample_fmts: {const} PAVSampleFormatArray; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
    channel_layouts: {const} PCint64;          ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
    max_lowres: byte;                          ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
    priv_class: {const} PAVClass;              ///< AVClass for the private context
    profiles: {const} PAVProfile;              ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}

    (**
     * @defgroup framethreading Frame-level threading support functions.
     * @{
     *)
    (**
     * If defined, called on thread contexts when they are created.
     * If the codec allocates writable tables in init(), re-allocate them here.
     * priv_data will be set to a copy of the original.
     *)
    init_thread_copy: function (avctx: PAVCodecContext): Pcint; cdecl;
    (**
     * Copy necessary context variables from a previous thread context to the current one.
     * If not defined, the next thread will start automatically; otherwise, the codec
     * must call ff_thread_finish_setup().
     *
     * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
     *)
    update_thread_context: function (dst: PAVCodecContext; src: {const} PAVCodecContext): cint; cdecl;
    (** @} *)
  end; {TAVCodec}

(**
 * AVHWAccel.
 *)
  TAVHWAccel = record
    (**
     * Name of the hardware accelerated codec.
     * The name is globally unique among encoders and among decoders (but an
     * encoder and a decoder can share the same name).
     *)
    name: PAnsiChar;

    (**
     * Type of codec implemented by the hardware accelerator.
     *
     * See AVMediaType_xxx
     *)
    type_: TAVMediaType;
    
    (**
     * Codec implemented by the hardware accelerator.
     *
     * See CODEC_ID_xxx
     *)
    id: TCodecID;

    (**
     * Supported pixel format.
     *
     * Only hardware accelerated formats are supported here.
     *)
    pix_fmt: PAVPixelFormat; 

    (**
     * Hardware accelerated codec capabilities.
     * see FF_HWACCEL_CODEC_CAP_*
     *)
    capabilities: cint;

    next: PAVHWAccel;

    (**
     * Called at the beginning of each frame or field picture.
     *
     * Meaningful frame information (codec specific) is guaranteed to
     * be parsed at this point. This function is mandatory.
     *
     * Note that buf can be NULL along with buf_size set to 0.
     * Otherwise, this means the whole frame is available at this point.
     *
     * @param avctx the codec context
     * @param buf the frame data buffer base
     * @param buf_size the size of the frame in bytes
     * @return zero if successful, a negative value otherwise
     *)
    start_frame: function (avctx:       PAVCodecContext; 
                           buf: {const} PByteArray; 
                           buf_size:    cuint): cint; cdecl;

    (**
     * Callback for each slice.
     *
     * Meaningful slice information (codec specific) is guaranteed to
     * be parsed at this point. This function is mandatory.
     *
     * @param avctx the codec context
     * @param buf the slice data buffer base
     * @param buf_size the size of the slice in bytes
     * @return zero if successful, a negative value otherwise
     *)
    decode_slice: function (avctx:       PAVCodecContext;
                            buf: {const} PByteArray; 
                            buf_size:    cuint): cint; cdecl;

    (**
     * Called at the end of each frame or field picture.
     *
     * The whole picture is parsed at this point and can now be sent
     * to the hardware accelerator. This function is mandatory.
     *
     * @param avctx the codec context
     * @return zero if successful, a negative value otherwise
     *)
    end_frame: function (avctx: PAVCodecContext): cint; cdecl;
        
    (**
     * Size of HW accelerator private data.
     *
     * Private data is allocated with av_mallocz() before
     * AVCodecContext.get_buffer() and deallocated after
     * AVCodecContext.release_buffer().
     *)
    priv_data_size: cint;
  end; {TAVHWAccel}

(**
 * four components are given, that's all.
 * the last component is alpha
 *)
  PAVPicture = ^TAVPicture;
  TAVPicture = record
    data: array [0..3] of PByteArray;
    linesize: array [0..3] of cint;       ///< number of bytes per line
  end; {TAVPicture}

  TAVSubtitleType = (
    SUBTITLE_NONE,

    SUBTITLE_BITMAP,                ///< A bitmap, pict will be set

    (**
     * Plain text, the text field must be set by the decoder and is
     * authoritative. ass and pict fields may contain approximations.
     *)
    SUBTITLE_TEXT,

    (**
     * Formatted text, the ass field must be set by the decoder and is
     * authoritative. pict and text fields may contain approximations.
     *)
    SUBTITLE_ASS
  ); {TAVSubtitleType}

  PPAVSubtitleRect = ^PAVSubtitleRect;
  PAVSubtitleRect = ^TAVSubtitleRect;
  TAVSubtitleRect = record
    x: cint;        ///< top left corner  of pict, undefined when pict is not set
    y: cint;        ///< top left corner  of pict, undefined when pict is not set
    w: cint;        ///< width            of pict, undefined when pict is not set
    h: cint;        ///< height           of pict, undefined when pict is not set
    nb_colors: cint; ///< number of colors in pict, undefined when pict is not set

    (**
     * data+linesize for the bitmap of this subtitle.
     * can be set for text/ass as well once they where rendered
     *)
    pict: TAVPicture;
    type_: TAVSubtitleType;

    text: PAnsiChar;                     ///< 0 terminated plain UTF-8 text

    (**
     * 0 terminated ASS/SSA compatible event line.
     * The pressentation of this is unaffected by the other values in this
     * struct.
     *)
    ass: PAnsiChar;
  end; {TAVSubtitleRect}

  PPAVSubtitle = ^PAVSubtitle;
  PAVSubtitle = ^TAVSubtitle;
  TAVSubtitle = record
    format: cuint16; (* 0 = graphics *)
    start_display_time: cuint32; (* relative to packet pts, in ms *)
    end_display_time: cuint32; (* relative to packet pts, in ms *)
    num_rects: cuint;
    rects: PPAVSubtitleRect;
    pts: cint64;     ///< Same as packet pts, in AV_TIME_BASE
  end; {TAVSubtitle}

(* packet functions *)

(**
 * @deprecated use NULL instead
 *)
procedure av_destruct_packet_nofree(pkt: PAVPacket);
  cdecl; external av__codec; deprecated;

(*
 * Default packet destructor.
 *)
procedure av_destruct_packet(pkt: PAVPacket);
  cdecl; external av__codec;

(*
 * Initialize optional fields of a packet with default values.
 *
 * @param pkt packet
 *)
procedure av_init_packet(var pkt: TAVPacket);
  cdecl; external av__codec;

(*
 * Allocate the payload of a packet and initialize its fields with
 * default values.
 *
 * @param pkt packet
 * @param size wanted payload size
 * @return 0 if OK, AVERROR_xxx otherwise
 *)
function av_new_packet(pkt: PAVPacket; size: cint): cint;
  cdecl; external av__codec;

(*
 * Reduce packet size, correctly zeroing padding
 *
 * @param pkt packet
 * @param size new size
 *)
procedure av_shrink_packet(pkt: PAVPacket; size: cint);
  cdecl; external av__codec;

(*
 * @warning This is a hack - the packet memory allocation stuff is broken. The
 * packet is allocated if it was not really allocated.
 *)
function av_dup_packet(pkt: PAVPacket): cint;
  cdecl; external av__codec;

(*
 * Free a packet.
 *
 * @param pkt packet to free
 *)
procedure av_free_packet(pkt: PAVPacket);
  cdecl; external av__codec;

(* resample.c *)
type
  PReSampleContext = pointer;
  PAVResampleContext = pointer;
  PImgReSampleContext = pointer;

{$IF FF_API_AUDIO_OLD}
(**
 * @deprecated Use av_audio_resample_init() instead.
 *)
function audio_resample_init (output_channels: cint; input_channels: cint;
                              output_rate: cint; input_rate: cint): PReSampleContext;
  cdecl; external av__codec; deprecated;
{$IFEND}

(**
 *  Initialize audio resampling context.
 *
 * @param output_channels  number of output channels
 * @param input_channels   number of input channels
 * @param output_rate      output sample rate
 * @param input_rate       input sample rate
 * @param sample_fmt_out   requested output sample format
 * @param sample_fmt_in    input sample format
 * @param filter_length    length of each FIR filter in the filterbank relative to the cutoff frequency
 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
 * @param linear           if 1 then the used FIR filter will be linearly interpolated
                           between the 2 closest, if 0 the closest will be used
 * @param cutoff           cutoff frequency, 1.0 corresponds to half the output sampling rate
 * @return allocated ReSampleContext, NULL if error occured
 *)
 function av_audio_resample_init(output_channels: cint; input_channels: cint;
                                 output_rate: cint; input_rate: cint;
                                 sample_fmt_out: TAVSampleFormat;
                                 sample_fmt_in: TAVSampleFormat;
                                 filter_length: cint; log2_phase_count: cint;
                                 linear: cint; cutoff: cdouble): PReSampleContext;
  cdecl; external av__codec;
					
function audio_resample (s: PReSampleContext; output: PSmallint; input: PSmallint; nb_samples: cint): cint;
  cdecl; external av__codec;

(**
 * Free resample context.
 *
 * @param s a non-NULL pointer to a resample context previously
 *          created with av_audio_resample_init()
 *)
procedure audio_resample_close (s: PReSampleContext);
  cdecl; external av__codec;

(**
 * Initialize an audio resampler.
 * Note, if either rate is not an integer then simply scale both rates up so they are.
 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
 * @param linear If 1 then the used FIR filter will be linearly interpolated
                 between the 2 closest, if 0 the closest will be used
 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
 *)
function av_resample_init (out_rate: cint; in_rate: cint; filter_length: cint;
                           log2_phase_count: cint; linear: cint; cutoff: cdouble): PAVResampleContext;
  cdecl; external av__codec;

(**
 * Resample an array of samples using a previously configured context.
 * @param src an array of unconsumed samples
 * @param consumed the number of samples of src which have been consumed are returned here
 * @param src_size the number of unconsumed samples available
 * @param dst_size the amount of space in samples available in dst
 * @param update_ctx If this is 0 then the context will not be modified, that way several channels can be resampled with the same context.
 * @return the number of samples written in dst or -1 if an error occurred
 *)
function av_resample (c: PAVResampleContext; dst: PSmallint; src: PSmallint; var consumed: cint;
                      src_size: cint; dst_size: cint; update_ctx: cint): cint;
  cdecl; external av__codec;

(**
 * Compensate samplerate/timestamp drift. The compensation is done by changing
 * the resampler parameters, so no audible clicks or similar distortions occur
 * @param compensation_distance distance in output samples over which the compensation should be performed
 * @param sample_delta number of output samples which should be output less
 *
 * example: av_resample_compensate(c, 10, 500)
 * here instead of 510 samples only 500 samples would be output
 *
 * note, due to rounding the actual compensation might be slightly different,
 * especially if the compensation_distance is large and the in_rate used during init is small
 *)
procedure av_resample_compensate (c: PAVResampleContext; sample_delta: cint;
                                  compensation_distance: cint);
  cdecl; external av__codec;

procedure av_resample_close (c: PAVResampleContext);
  cdecl; external av__codec;

(**
 * Allocate memory for a picture.  Call avpicture_free to free it.
 *
 * @param picture the picture to be filled in.
 * @param pix_fmt the format of the picture.
 * @param width the width of the picture.
 * @param height the height of the picture.
 * @return Zero if successful, a negative value if not.
 *)
function avpicture_alloc (picture: PAVPicture; pix_fmt: TAVPixelFormat;
                          width: cint; height: cint): cint;
  cdecl; external av__codec;

(**
 * Free a picture previously allocated by avpicture_alloc().
 *
 * @param picture the AVPicture to be freed
 *)
procedure avpicture_free (picture: PAVPicture);
  cdecl; external av__codec;

(**
 * Fill in the AVPicture fields.
 * The fields of the given AVPicture are filled in by using the 'ptr' address
 * which points to the image data buffer. Depending on the specified picture
 * format, one or multiple image data pointers and line sizes will be set.
 * If a planar format is specified, several pointers will be set pointing to
 * the different picture planes and the line sizes of the different planes
 * will be stored in the lines_sizes array.
 * Call with ptr == NULL to get the required size for the ptr buffer.
 *
 * @param picture AVPicture whose fields are to be filled in
 * @param ptr Buffer which will contain or contains the actual image data
 * @param pix_fmt The format in which the picture data is stored.
 * @param width the width of the image in pixels
 * @param height the height of the image in pixels
 * @return size of the image data in bytes
 *)
function avpicture_fill (picture: PAVPicture; ptr: pcuint8;
                 pix_fmt: TAVPixelFormat; width: cint; height: cint): cint;
  cdecl; external av__codec;

(**
 * Copy pixel data from an AVPicture into a buffer.
 * The data is stored compactly, without any gaps for alignment or padding
 * which may be applied by avpicture_fill().
 *
 * \see avpicture_get_size()
 *
 * @param[in] src AVPicture containing image data
 * @param[in] pix_fmt The format in which the picture data is stored.
 * @param[in] width the width of the image in pixels.
 * @param[in] height the height of the image in pixels.
 * @param[out] dest A buffer into which picture data will be copied.
 * @param[in] dest_size The size of 'dest'.
 * @return The number of bytes written to dest, or a negative value (error code) on error.
 *)
function avpicture_layout (src: {const} PAVPicture; pix_fmt: TAVPixelFormat;
                   width: cint; height: cint;
                   dest: PByteArray; dest_size: cint): cint;
  cdecl; external av__codec;

(**
 * Calculate the size in bytes that a picture of the given width and height
 * would occupy if stored in the given picture format.
 * Note that this returns the size of a compact representation as generated
 * by avpicture_layout, which can be smaller than the size required for e.g.
 * avpicture_fill.
 *
 * @param pix_fmt the given picture format
 * @param width the width of the image
 * @param height the height of the image
 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
 *)
function avpicture_get_size (pix_fmt: TAVPixelFormat; width: cint; height: cint): cint;
  cdecl; external av__codec;

procedure avcodec_get_chroma_sub_sample (pix_fmt: TAVPixelFormat; var h_shift: cint; var v_shift: cint);
  cdecl; external av__codec;

{$IF FF_API_GET_PIX_FMT_NAME}
(**
 * Return the short name for a pixel format.
 *
 * \see av_get_pix_fmt(), av_get_pix_fmt_string().
 * @deprecated Deprecated in favor of av_get_pix_fmt_name().
 *)
function avcodec_get_pix_fmt_name(pix_fmt: TAVPixelFormat): PAnsiChar;
  cdecl; external av__codec; deprecated;
{$IFEND}

procedure avcodec_set_dimensions(s: PAVCodecContext; width: cint; height: cint);
  cdecl; external av__codec;

{$IF LIBAVCODEC_MAX_VERSION_MAJOR < 53}
(**
 * Return the pixel format corresponding to the name name.
 *
 * If there is no pixel format with name name, then looks for a
 * pixel format with the name corresponding to the native endian
 * format of name.
 * For example in a little-endian system, first looks for "gray16",
 * then for "gray16le".
 *
 * Finally if no pixel format has been found, returns PIX_FMT_NONE.*
 * @deprecated Deprecated in favor of av_get_pix_fmt().
 *)
function avcodec_get_pix_fmt(name: {const} PAnsiChar): TAVPixelFormat;
  cdecl; external av__codec; deprecated;
{$IFEND}

(**
 * Return a value representing the fourCC code associated to the
 * pixel format pix_fmt, or 0 if no associated fourCC code can be
 * found.
 *)
function avcodec_pix_fmt_to_codec_tag(pix_fmt: TAVPixelFormat): cuint;
  cdecl; external av__codec;

(**
 * Put a string representing the codec tag codec_tag in buf.
 *
 * @param buf_size size in bytes of buf
 * @return the length of the string that would have been generated if
 * enough space had been available, excluding the trailing null
 *)
function av_get_codec_tag_string(buf: PAnsiChar; buf_size: size_t; codec_tag: cuint): size_t;
  cdecl; external av__codec;

const
  FF_LOSS_RESOLUTION  = $0001; {**< loss due to resolution change *}
  FF_LOSS_DEPTH       = $0002; {**< loss due to color depth change *}
  FF_LOSS_COLORSPACE  = $0004; {**< loss due to color space conversion *}
  FF_LOSS_ALPHA       = $0008; {**< loss of alpha bits *}
  FF_LOSS_COLORQUANT  = $0010; {**< loss due to color quantization *}
  FF_LOSS_CHROMA      = $0020; {**< loss of chroma (e.g. RGB to gray conversion) *}

(**
 * Compute what kind of losses will occur when converting from one specific
 * pixel format to another.
 * When converting from one pixel format to another, information loss may occur.
 * For example, when converting from RGB24 to GRAY, the color information will
 * be lost. Similarly, other losses occur when converting from some formats to
 * other formats. These losses can involve loss of chroma, but also loss of
 * resolution, loss of color depth, loss due to the color space conversion, loss
 * of the alpha bits or loss due to color quantization.
 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
 * which will occur when converting from one pixel format to another.
 *
 * @param[in] dst_pix_fmt destination pixel format
 * @param[in] src_pix_fmt source pixel format
 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
 * @return Combination of flags informing you what kind of losses will occur.
 *)
function avcodec_get_pix_fmt_loss (dst_pix_fmt: TAVPixelFormat; src_pix_fmt: TAVPixelFormat;
                           has_alpha: cint): cint;
  cdecl; external av__codec;

(**
 * Find the best pixel format to convert to given a certain source pixel
 * format.  When converting from one pixel format to another, information loss
 * may occur.  For example, when converting from RGB24 to GRAY, the color
 * information will be lost. Similarly, other losses occur when converting from
 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
 * the given pixel formats should be used to suffer the least amount of loss.
 * The pixel formats from which it chooses one, are determined by the
 * pix_fmt_mask parameter.
 *
 * @code
 * src_pix_fmt = PIX_FMT_YUV420P;
 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
 * @endcode
 *
 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
 * @param[in] src_pix_fmt source pixel format
 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
 * @return The best pixel format to convert to or -1 if none was found.
 *)
function avcodec_find_best_pix_fmt(pix_fmt_mask: cint64; src_pix_fmt: TAVPixelFormat;
                      has_alpha: cint; loss_ptr: PCint): TAVPixelFormat;
  cdecl; external av__codec;

{$IF LIBAVCODEC_VERSION_MAJOR < 53}
(**
 * @deprecated Use av_get_pix_fmt_string() instead.
 *)
procedure avcodec_pix_fmt_string (buf: PAnsiChar; buf_size: cint; pix_fmt: TAVPixelFormat);
  cdecl; external av__codec; deprecated;
{$IFEND}

const
  FF_ALPHA_TRANSP      = $0001; {* image has some totally transparent pixels *}
  FF_ALPHA_SEMI_TRANSP = $0002; {* image has some transparent pixels *}

(**
 * Tell if an image really has transparent alpha values.
 * @return ored mask of FF_ALPHA_xxx constants
 *)
function img_get_alpha_info (src: {const} PAVPicture;
                             pix_fmt: TAVPixelFormat;
                             width:   cint;
                             height:  cint): cint;
  cdecl; external av__codec;

(* deinterlace a picture *)
(* deinterlace - if not supported return -1 *)
function avpicture_deinterlace (dst: PAVPicture;
                        src: {const} PAVPicture;
                        pix_fmt: TAVPixelFormat;
                        width:   cint;
                        height:  cint): cint;
  cdecl; external av__codec;

(* external high level API *)

(**
 * If c is NULL, returns the first registered codec,
 * if c is non-NULL, returns the next registered codec after c,
 * or NULL if c is the last one.
 *)
function av_codec_next(c: PAVCodec): PAVCodec;
  cdecl; external av__codec;

(**
 * Return the LIBAVCODEC_VERSION_INT constant.
 *)
function avcodec_version(): cuint;
  cdecl; external av__codec;

(**
 * Return the libavcodec build-time configuration.
 *)
function avcodec_configuration(): PAnsiChar;
  cdecl; external av__codec;

(**
 * Return the libavcodec license.
 *)
function avcodec_license(): PAnsiChar;
  cdecl; external av__codec;

(**
 * Initialize libavcodec.
 *
 * @warning This function must be called before any other libavcodec
 * function.
 *
 * @warning This function is not thread-safe.
 *)
procedure avcodec_init();
  cdecl; external av__codec;

{$IF LIBAVCODEC_VERSION_MAJOR < 53}
(**
 * @deprecated Deprecated in favor of avcodec_register().
 *)
procedure register_avcodec(codec: PAVCodec);
  cdecl; external av__codec; deprecated;
{$IFEND}

(**
 * Register the codec codec and initialize libavcodec.
 *
 * @see avcodec_init(), avcodec_register_all()
 *)
procedure avcodec_register(codec: PAVCodec);
  cdecl; external av__codec;

(**
 * Find a registered encoder with a matching codec ID.
 *
 * @param id CodecID of the requested encoder
 * @return An encoder if one was found, NULL otherwise.
 *)
function avcodec_find_encoder(id: TCodecID): PAVCodec;
  cdecl; external av__codec;

(**
 * Find a registered encoder with the specified name.
 *
 * @param name name of the requested encoder
 * @return An encoder if one was found, NULL otherwise.
 *)
function avcodec_find_encoder_by_name(name: PAnsiChar): PAVCodec;
  cdecl; external av__codec;

(**
 * Find a registered decoder with a matching codec ID.
 *
 * @param id CodecID of the requested decoder
 * @return A decoder if one was found, NULL otherwise.
 *)
function avcodec_find_decoder(id: TCodecID): PAVCodec;
  cdecl; external av__codec;

(**
 * Find a registered decoder with the specified name.
 *
 * @param name name of the requested decoder
 * @return A decoder if one was found, NULL otherwise.
 *)
function avcodec_find_decoder_by_name(name: PAnsiChar): PAVCodec;
  cdecl; external av__codec;
procedure avcodec_string(buf: PAnsiChar; buf_size: cint; enc: PAVCodecContext; encode: cint);
  cdecl; external av__codec;

(**
 * Return a name for the specified profile, if available.
 *
 * @param codec the codec that is searched for the given profile
 * @param profile the profile value for which a name is requested
 * @return A name for the profile if found, NULL otherwise.
 *)
function av_get_profile_name(codec: {const} PAVCodec; profile: cint): {const} PAnsiChar;
  cdecl; external av__codec;

(**
 * Set the fields of the given AVCodecContext to default values.
 *
 * @param s The AVCodecContext of which the fields should be set to default values.
 *)
procedure avcodec_get_context_defaults(s: PAVCodecContext);
  cdecl; external av__codec;

(** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
 *  we WILL change its arguments and name a few times! *)
procedure avcodec_get_context_defaults2(s: PAVCodecContext; ctype: TAVMediaType);
  cdecl; external av__codec;

(** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
 *  we WILL change its arguments and name a few times! *)
procedure avcodec_get_context_defaults3(s: PAVCodecContext; codec: PAVCodec);
  cdecl; external av__codec;

(**
 * Allocate an AVCodecContext and sets it fields to default values.  The
 * resulting struct can be deallocated by simply calling av_free().
 *
 * @return An AVCodecContext filled with default values or NULL on failure.
 * @see avcodec_get_context_defaults
 *)
function avcodec_alloc_context(): PAVCodecContext;
  cdecl; external av__codec;

(** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
 *  we WILL change its arguments and name a few times! *)
function avcodec_alloc_context2(ctype: TAVMediaType): PAVCodecContext;
  cdecl; external av__codec;

(** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
 *  we WILL change its arguments and name a few times! *)
function avcodec_alloc_context3(codec: PAVCodec): PAVCodecContext;
  cdecl; external av__codec;

(**
 * Copy the settings of the source AVCodecContext into the destination
 * AVCodecContext. The resulting destination codec context will be
 * unopened, i.e. you are required to call avcodec_open() before you
 * can use this AVCodecContext to decode/encode video/audio data.
 *
 * @param dest target codec context, should be initialized with
 *             avcodec_alloc_context(), but otherwise uninitialized
 * @param src source codec context
 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
 *)
function avcodec_copy_context(dest: PAVCodecContext; src: {const} PAVCodecContext): cint;
  cdecl; external av__codec;

(**
 * Set the fields of the given AVFrame to default values.
 *
 * @param pic The AVFrame of which the fields should be set to default values.
 *)
procedure avcodec_get_frame_defaults (pic: PAVFrame);
  cdecl; external av__codec;

(**
 * Allocate an AVFrame and set its fields to default values.  The resulting
 * struct can be deallocated by simply calling av_free().
 *
 * @return An AVFrame filled with default values or NULL on failure.
 * @see avcodec_get_frame_defaults
 *)
function avcodec_alloc_frame(): PAVFrame;
  cdecl; external av__codec;

function avcodec_default_get_buffer (s: PAVCodecContext; pic: PAVFrame): cint;
  cdecl; external av__codec;
procedure avcodec_default_release_buffer (s: PAVCodecContext; pic: PAVFrame);
  cdecl; external av__codec;
function avcodec_default_reget_buffer (s: PAVCodecContext; pic: PAVFrame): cint;
  cdecl; external av__codec;

(**
 * Return the amount of padding in pixels which the get_buffer callback must
 * provide around the edge of the image for codecs which do not have the
 * CODEC_FLAG_EMU_EDGE flag.
 *
 * @return Required padding in pixels.
 *)
function avcodec_get_edge_width(): cuint;
  cdecl; external av__codec;

(**
 * Modify width and height values so that they will result in a memory
 * buffer that is acceptable for the codec if you do not use any horizontal
 * padding.
 *
 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
 * according to avcodec_get_edge_width() before.
 *)
procedure avcodec_align_dimensions(s: PAVCodecContext; width: PCint; height: PCint);
  cdecl; external av__codec;

(**
 * Modifiy width and height values so that they will result in a memory
 * buffer that is acceptable for the codec if you also ensure that all
 * line sizes are a multiple of the respective linesize_align[i].
 *
 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
 * according to avcodec_get_edge_width() before.
 *)
procedure avcodec_align_dimensions2(s: PAVCodecContext; width: PCint; height: PCint;
                                    linesize_align: PQuadIntArray);
  cdecl; external av__codec;

{$IF LIBAVCODEC_VERSION_MAJOR < 53}
(**
 * @deprecated Deprecated in favor of av_check_image_size().
 *)
function avcodec_check_dimensions(av_log_ctx: pointer; w: cuint; h: cuint): cint;
  cdecl; external av__codec; deprecated;
{$IFEND}

function avcodec_default_get_format(s: PAVCodecContext; fmt: {const} PAVPixelFormat): TAVPixelFormat;
  cdecl; external av__codec;

{$IF FF_API_THREAD_INIT}
(**
 * @deprecated Set s->thread_count before calling avcodec_open() instead of calling this.
 *)
function avcodec_thread_init(s: PAVCodecContext; thread_count: cint): cint;
  cdecl; external av__codec; deprecated;
procedure avcodec_thread_free(s: PAVCodecContext);
  cdecl; external av__codec; deprecated;
{$IFEND}

function avcodec_default_execute(s: PAVCodecContext; func: TExecuteFunc; arg: Pointer; var ret: cint; count: cint; size: cint): cint;
  cdecl; external av__codec;

function avcodec_default_execute2(s: PAVCodecContext; func: TExecuteFunc; arg: Pointer; var ret: cint; count: cint): cint;
  cdecl; external av__codec;
//FIXME func typedef

(**
 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
 * function the context has to be allocated.
 *
 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
 * retrieving a codec.
 *
 * @warning This function is not thread safe!
 *
 * @code
 * avcodec_register_all();
 * codec = avcodec_find_decoder(CODEC_ID_H264);
 * if (!codec)
 *     exit(1);
 *
 * context = avcodec_alloc_context();
 *
 * if (avcodec_open(context, codec) < 0)
 *     exit(1);
 * @endcode
 *
 * @param avctx The context which will be set up to use the given codec.
 * @param codec The codec to use within the context.
 * @return zero on success, a negative value on error
 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
 *)
function avcodec_open(avctx: PAVCodecContext; codec: PAVCodec): cint;
  cdecl; external av__codec;


{$IF FF_API_AUDIO_OLD}
(**
 * Decode an audio frame from buf into samples.
 * Wrapper function which calls avcodec_decode_audio3.
 *
 * @deprecated Use avcodec_decode_audio3 instead.
 * @param avctx the codec context
 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
 * @param[in,out] frame_size_ptr the output buffer size in bytes
 * @param[in] buf the input buffer
 * @param[in] buf_size the input buffer size in bytes
 * @return On error a negative value is returned, otherwise the number of bytes
 * used or zero if no frame could be decompressed.
 *)
function avcodec_decode_audio2(avctx: PAVCodecContext; samples: PSmallint;
               var frame_size_ptr: cint;
               buf: {const} PByteArray; buf_size: cint): cint;
  cdecl; external av__codec; deprecated;
{$IFEND}

(**
 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
 * Some decoders may support multiple frames in a single AVPacket, such
 * decoders would then just decode the first frame. In this case,
 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
 * the remaining data in order to decode the second frame etc.
 * If no frame
 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
 * decompressed frame size in bytes.
 *
 * @warning You must set frame_size_ptr to the allocated size of the
 * output buffer before calling avcodec_decode_audio3().
 *
 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
 * the actual read bytes because some optimized bitstream readers read 32 or 64
 * bits at once and could read over the end.
 *
 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
 * no overreading happens for damaged MPEG streams.
 *
 * @note You might have to align the input buffer avpkt->data and output buffer
 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
 * necessary at all, on others it won't work at all if not aligned and on others
 * * it will work but it will have an impact on performance.
 *
 * In practice, avpkt->data should have 4 byte alignment at minimum and
 * samples should be 16 byte aligned unless the CPU doesn't need it
 * (AltiVec and SSE do).
 *
 * @note Some codecs have a delay between input and output, these need to be
 * fed with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
 *
 * @param avctx the codec context
 * @param[out] samples the output buffer
 * @param[in,out] frame_size_ptr the output buffer size in bytes
 * @param[in] avpkt The input AVPacket containing the input buffer.
 *            You can create such packet with av_init_packet() and by then setting
 *            data and size, some decoders might in addition need other fields.
 *            All decoders are designed to use the least fields possible though.
 * @return On error a negative value is returned, otherwise the number of bytes
 * used or zero if no frame data was decompressed (used) from the input AVPacket.
 *)
function avcodec_decode_audio3(avctx: PAVCodecContext; samples: PSmallint;
               var frame_size_ptr: cint;
               avpkt: PAVPacket): cint;
  cdecl; external av__codec;

{$IF FF_API_VIDEO_OLD}
(**
 * Decode a video frame from buf into picture.
 * Wrapper function which calls avcodec_decode_video2.
 *
 * @deprecated Use avcodec_decode_video2 instead.
 * @param avctx the codec context
 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
 *             Use avcodec_alloc_frame to get an AVFrame, the codec will
 *             allocate memory for the actual bitmap.
 *             with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
 *             with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
 *                   decodes and the decoder tells the user once it does not need the data anymore,
 *                   the user app can at this point free/reuse/keep the memory as it sees fit.
 *
 * @param[in] buf the input buffer
 * @param[in] buf_size the size of the input buffer in bytes
 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
 * @return On error a negative value is returned, otherwise the number of bytes
 * used or zero if no frame could be decompressed.
 *)
function avcodec_decode_video(avctx: PAVCodecContext; picture: PAVFrame;
                       var got_picture_ptr: cint;
                       buf: {const} PByteArray; buf_size: cint): cint;
  cdecl; external av__codec; deprecated;
{$IFEND}

(**
 * Decode the video frame of size avpkt->size from avpkt->data into picture.
 * Some decoders may support multiple frames in a single AVPacket, such
 * decoders would then just decode the first frame.
 *
 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
 * the actual read bytes because some optimized bitstream readers read 32 or 64
 * bits at once and could read over the end.
 *
 * @warning The end of the input buffer buf should be set to 0 to ensure that
 * no overreading happens for damaged MPEG streams.
 *
 * @note You might have to align the input buffer avpkt->data.
 * The alignment requirements depend on the CPU: on some CPUs it isn't
 * necessary at all, on others it won't work at all if not aligned and on others
 * it will work but it will have an impact on performance.
 *
 * In practice, avpkt->data should have 4 byte alignment at minimum.
 *
 * @param avctx the codec context
 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
 * @param[in] avpkt The input AVpacket containing the input buffer.
 *            You can create such packet with av_init_packet() and by then setting
 *            data and size, some decoders might in addition need other fields like
 *            flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
 *            fields possible.
 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
 * @return On error a negative value is returned, otherwise the number of bytes
 * used or zero if no frame could be decompressed.
 *)
function avcodec_decode_video2(avctx: PAVCodecContext; picture: PAVFrame;
                       var got_picture_ptr: cint;
                       avpkt: PAVPacket): cint;
  cdecl; external av__codec;

{$IF FF_API_SUBTITLE_OLD}
(* Decode a subtitle message. Return -1 if error, otherwise return the
 * number of bytes used. If no subtitle could be decompressed,
 * got_sub_ptr is zero. Otherwise, the subtitle is stored in*sub.
 *)
function avcodec_decode_subtitle(avctx: PAVCodecContext; sub: PAVSubtitle;
                          var got_sub_ptr: cint;
                          buf: {const} PByteArray; buf_size: cint): cint;
  cdecl; external av__codec; deprecated;
{$IFEND}
  
(* Decode a subtitle message.
 * Return a negative value on error, otherwise return the number of bytes used.
 * If no subtitle could be decompressed, got_sub_ptr is zero.
 * Otherwise, the subtitle is stored in *sub.
 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
 * simplicity, because the performance difference is expect to be negligible 
 * and reusing a get_buffer written for video codecs would probably perform badly
 * due to a potentially very different allocation pattern.
 *
 * @param avctx the codec context
 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
                   freed with avsubtitle_free if *got_sub_ptr is set.
 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
 * @param[in] avpkt The input AVPacket containing the input buffer.
 *)
function avcodec_decode_subtitle2(avctx: PAVCodecContext; sub: PAVSubtitle;
                          var got_sub_ptr: cint;
                          avpkt: PAVPacket): cint;
  cdecl; external av__codec;

(**
 * Frees all allocated data in the given subtitle struct.
 *
 * @param sub AVSubtitle to free.
 *)
procedure avsubtitle_free(sub: PAVSubtitle);
  cdecl; external av__codec;

function avcodec_parse_frame(avctx: PAVCodecContext; pdata: PPointer;
                      data_size_ptr: PCint;
                      buf: PByteArray; buf_size: cint): cint;
  cdecl; external av__codec;

(**
 * Encode an audio frame from samples into buf.
 *
 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
 * However, for PCM audio the user will know how much space is needed
 * because it depends on the value passed in buf_size as described
 * below. In that case a lower value can be used.
 *
 * @param avctx the codec context
 * @param[out] buf the output buffer
 * @param[in] buf_size the output buffer size
 * @param[in] samples the input buffer containing the samples
 * The number of samples read from this buffer is frame_size*channels,
 * both of which are defined in avctx.
 * For PCM audio the number of samples read from samples is equal to
 * buf_size * input_sample_size / output_sample_size.
 * @return On error a negative value is returned, on success zero or the number
 * of bytes used to encode the data read from the input buffer.
 *)
function avcodec_encode_audio(avctx: PAVCodecContext; buf: PByte;
                      buf_size: cint; samples: {const} PSmallint): cint;
  cdecl; external av__codec;

(**
 * Encode a video frame from pict into buf.
 * The input picture should be
 * stored using a specific format, namely avctx.pix_fmt.
 *
 * @param avctx the codec context
 * @param[out] buf the output buffer for the bitstream of encoded frame
 * @param[in] buf_size the size of the output buffer in bytes
 * @param[in] pict the input picture to encode
 * @return On error a negative value is returned, on success zero or the number
 * of bytes used from the output buffer.
 *)
function avcodec_encode_video(avctx: PAVCodecContext; buf: PByte;
                      buf_size: cint; pict: {const} PAVFrame): cint;
  cdecl; external av__codec;
function avcodec_encode_subtitle(avctx: PAVCodecContext; buf: PByteArray;
                      buf_size: cint; sub: {const} PAVSubtitle): cint;
  cdecl; external av__codec;

function avcodec_close(avctx: PAVCodecContext): cint;
  cdecl; external av__codec;

(**
 * Register all the codecs, parsers and bitstream filters which were enabled at
 * configuration time. If you do not call this function you can select exactly
 * which formats you want to support, by using the individual registration
 * functions.
 *
 * @see register_avcodec
 * @see avcodec_register
 * @see av_register_codec_parser
 * @see av_register_bitstream_filter
 *)
procedure avcodec_register_all();
  cdecl; external av__codec;

(**
 * Flush buffers, should be called when seeking or when switching to a different stream.
 *)
procedure avcodec_flush_buffers(avctx: PAVCodecContext);
  cdecl; external av__codec;
  
procedure avcodec_default_free_buffers(s: PAVCodecContext);
  cdecl; external av__codec;

(* misc useful functions *)

{$IF FF_API_OLD_FF_PICT_TYPES}
(**
 * Return a single letter to describe the given picture type pict_type.
 *
 * @param[in] pict_type the picture type
 * @return A single character representing the picture type.
 * @deprecated Use av_get_picture_type_char() instead.
 *)
function av_get_pict_type_char(pict_type: cint): AnsiChar;
  cdecl; external av__codec; deprecated;
{$IFEND}

(**
 * Return codec bits per sample.
 *
 * @param[in] codec_id the codec
 * @return Number of bits per sample or zero if unknown for the given codec.
 *)
function av_get_bits_per_sample(codec_id: TCodecID): cint;
  cdecl; external av__codec;

{$IF FF_API_OLD_SAMPLE_FMT}
(**
 * @deprecated Use av_get_bits_per_sample_fmt() instead.
 *)
function av_get_bits_per_sample_format(sample_fmt: TAVSampleFormat): cint;
  cdecl; external av__codec; deprecated;
{$IFEND}

const
  AV_PARSER_PTS_NB      = 4;
  PARSER_FLAG_COMPLETE_FRAMES = $0001;
  PARSER_FLAG_ONCE            = $0002;
/// Set if the parser has a valid file offset
  PARSER_FLAG_FETCHED_OFFSET  = $0004;

type
  (* frame parsing *)
  PAVCodecParserContext = ^TAVCodecParserContext;
  PAVCodecParser = ^TAVCodecParser;

  TAVCodecParserContext = record
    priv_data: pointer;
    parser: PAVCodecParser;
    frame_offset: cint64; (* offset of the current frame *)
    cur_offset: cint64; (* current offset (incremented by each av_parser_parse()) *)
    next_frame_offset: cint64; (* offset of the next frame *)
    (* video info *)
    pict_type: cint; (* XXX: put it back in AVCodecContext *)
    (**
     * This field is used for proper frame duration computation in lavf.
     * It signals, how much longer the frame duration of the current frame
     * is compared to normal frame duration.
     *
     * frame_duration = (1 + repeat_pict) * time_base
     *
     * It is used by codecs like H.264 to display telecined material.
     *)
    repeat_pict: cint; (* XXX: put it back in AVCodecContext *)
    pts: cint64;     (* pts of the current frame *)
    dts: cint64;     (* dts of the current frame *)

    (* private data *)
    last_pts: cint64;
    last_dts: cint64;
    fetch_timestamp: cint;

    cur_frame_start_index: cint;
    cur_frame_offset: array [0..AV_PARSER_PTS_NB - 1] of cint64;
    cur_frame_pts: array [0..AV_PARSER_PTS_NB - 1] of cint64;
    cur_frame_dts: array [0..AV_PARSER_PTS_NB - 1] of cint64;

    flags: cint;

    offset: cint64;      ///< byte offset from starting packet start
    cur_frame_end: array [0..AV_PARSER_PTS_NB - 1] of cint64;

    (*!
     * Set by parser to 1 for key frames and 0 for non-key frames.
     * It is initialized to -1, so if the parser doesn't set this flag,
     * old-style fallback using FF_I_TYPE picture type as key frames
     * will be used.
     *)
    key_frame: cint;

    (**
     * Time difference in stream time base units from the pts of this
     * packet to the point at which the output from the decoder has converged
     * independent from the availability of previous frames. That is, the
     * frames are virtually identical no matter if decoding started from
     * the very first frame or from this keyframe.
     * Is AV_NOPTS_VALUE if unknown.
     * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
     * set.
     *
     * The purpose of this field is to allow seeking in streams that have no
     * keyframes in the conventional sense. It corresponds to the
     * recovery point SEI in H.264 and match_time_delta in NUT. It is also
     * essential for some types of subtitle streams to ensure that all
     * subtitles are correctly displayed after seeking.
     *)
    convergence_duration: cint64;

    // Timestamp generation support:
    (**
     * Synchronization point for start of timestamp generation.
     *
     * Set to >0 for sync point, 0 for no sync point and <0 for undefined
     * (default).
     *
     * For example, this corresponds to presence of H.264 buffering period
     * SEI message.
     *)
    dts_sync_point: cint;

    (**
     * Offset of the current timestamp against last timestamp sync point in
     * units of AVCodecContext.time_base.
     *
     * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
     * contain a valid timestamp offset.
     *
     * Note that the timestamp of sync point has usually a nonzero
     * dts_ref_dts_delta, which refers to the previous sync point. Offset of
     * the next frame after timestamp sync point will be usually 1.
     *
     * For example, this corresponds to H.264 cpb_removal_delay.
     *)
    dts_ref_dts_delta: cint;

    (**
     * Presentation delay of current frame in units of AVCodecContext.time_base.
     *
     * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
     * contain valid non-negative timestamp delta (presentation time of a frame
     * must not lie in the past).
     *
     * This delay represents the difference between decoding and presentation
     * time of the frame.
     *
     * For example, this corresponds to H.264 dpb_output_delay.
     *)
    pts_dts_delta: cint;

    (**
     * Position of the packet in file.
     *
     * Analogous to cur_frame_pts/dts
     *)
    cur_frame_pos: array [0..AV_PARSER_PTS_NB - 1] of cint64;

    (**
     * Byte position of currently parsed frame in stream.
     *)
    pos: cint64;

    (**
     * Previous frame byte position.
     *)
    last_pos: cint64;
  end; {AVCodecParserContext}

  TAVCodecParser = record
    codec_ids: array [0..4] of cint; (* several codec IDs are permitted *)
    priv_data_size: cint;
    parser_init: function(s: PAVCodecParserContext): cint; cdecl;
    parser_parse: function(s: PAVCodecParserContext;
                           avctx: PAVCodecContext;
                           poutbuf: {const} PPointer; poutbuf_size: PCint;
                           buf: {const} PByteArray; buf_size: cint): cint; cdecl;
    parser_close: procedure(s: PAVCodecParserContext); cdecl;
    split: function(avctx: PAVCodecContext; buf: {const} PByteArray;
                    buf_size: cint): cint; cdecl;
    next: PAVCodecParser;
  end; {AVCodecParser}

function av_parser_next(c: PAVCodecParser): PAVCodecParser;
  cdecl; external av__codec;

procedure av_register_codec_parser(parser: PAVCodecParser);
  cdecl; external av__codec;

function av_parser_init(codec_id: cint): PAVCodecParserContext;
  cdecl; external av__codec;

{$IF LIBAVCODEC_MAX_VERSION_MAJOR < 53}
function av_parser_parse(s: PAVCodecParserContext;
                  avctx: PAVCodecContext;
                  poutbuf: PPointer;
                  poutbuf_size: PCint;
                  buf: {const} PByteArray;
                  buf_size: cint;
                  pts: cint64;
                  dts: cint64): cint;
  cdecl; external av__codec; deprecated;
{$IFEND}

(**
 * Parse a packet.
 *
 * @param s             parser context.
 * @param avctx         codec context.
 * @param poutbuf       set to pointer to parsed buffer or NULL if not yet finished.
 * @param poutbuf_size  set to size of parsed buffer or zero if not yet finished.
 * @param buf           input buffer.
 * @param buf_size      input length, to signal EOF, this should be 0 (so that the last frame can be output).
 * @param pts           input presentation timestamp.
 * @param dts           input decoding timestamp.
 * @param pos           input byte position in stream.
 * @return the number of bytes of the input bitstream used.
 *
 * Example:
 * @code
 *   while (in_len) do
 *   begin
 *     len := av_parser_parse2(myparser, AVCodecContext, data, size,
 *                                       in_data, in_len,
 *                                       pts, dts, pos);
 *      in_data := in_data + len;
 *      in_len  := in_len  - len;
 *
 *      if (size) then
 *        decode_frame(data, size);
 *   end;
 * @endcode
 *)
function av_parser_parse2(s:    PAVCodecParserContext;
                  avctx:        PAVCodecContext;
                  poutbuf:      PPointer;
                  poutbuf_size: PCint;
                  buf: {const}  PByteArray;
                  buf_size:     cint;
                  pts:          cint64;
                  dts:          cint64;
                  pos:          cint64): cint;
   cdecl; external av__codec;

function av_parser_change(s: PAVCodecParserContext;
                   avctx: PAVCodecContext;
                   poutbuf: PPointer; poutbuf_size: PCint;
                   buf: {const} PByteArray; buf_size: cint; keyframe: cint): cint;
  cdecl; external av__codec;

procedure av_parser_close(s: PAVCodecParserContext);
  cdecl; external av__codec;

type
  PAVBitStreamFilterContext = ^TAVBitStreamFilterContext;
  PAVBitStreamFilter = ^TAVBitStreamFilter;

  TAVBitStreamFilterContext = record
    priv_data: pointer;
    filter: PAVBitStreamFilter;
    parser: PAVCodecParserContext;
    next: PAVBitStreamFilterContext;
  end;

  TAVBitStreamFilter = record
    name: PAnsiChar;
    priv_data_size: cint;
    filter: function(bsfc: PAVBitStreamFilterContext;
                  avctx: PAVCodecContext; args: {const} PAnsiChar;
                  poutbuf: PPointer; poutbuf_size: PCint;
                  buf: {const} PByte; buf_size: cint; keyframe: cint): cint; cdecl;
    close: procedure(bsfc: PAVBitStreamFilterContext);
    next: PAVBitStreamFilter;
  end;

procedure av_register_bitstream_filter(bsf: PAVBitStreamFilter);
  cdecl; external av__codec;

function av_bitstream_filter_init(name: {const} PAnsiChar): PAVBitStreamFilterContext;
  cdecl; external av__codec;

function av_bitstream_filter_filter(bsfc: PAVBitStreamFilterContext;
                               avctx: PAVCodecContext; args: {const} PAnsiChar;
                               poutbuf: PPointer; poutbuf_size: PCint;
                               buf: {const} PByte; buf_size: cint; keyframe: cint): cint;
  cdecl; external av__codec;

procedure av_bitstream_filter_close(bsf: PAVBitStreamFilterContext);
  cdecl; external av__codec;

function av_bitstream_filter_next(f: PAVBitStreamFilter): PAVBitStreamFilter;
  cdecl; external av__codec;

(* memory *)

(**
 * Reallocate the given block if it is not large enough, otherwise do nothing.
 *
 * @see av_realloc
 *)
procedure av_fast_realloc(ptr: pointer; size: PCuint; min_size: FF_INTERNALC_MEM_TYPE);
  cdecl; external av__codec;

(**
 * Allocate a buffer, reusing the given one if large enough.
 *
 * Contrary to av_fast_realloc the current buffer contents might not be
 * preserved and on error the old buffer is freed, thus no special
 * handling to avoid memleaks is necessary.
 *
 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
 * @param size size of the buffer *ptr points to
 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
 *                 *size 0 if an error occurred.
 *)
procedure av_fast_malloc(ptr: pointer; size: PCuint; min_size: FF_INTERNALC_MEM_TYPE);
  cdecl; external av__codec;

{$IF LIBAVCODEC_MAX_VERSION_MAJOR < 53}
(**
 * @deprecated Deprecated in favor of av_image_copy().
 *)
type
  PQuaduint8Array = ^TQuaduint8Array;
  TQuaduint8Array = array [0..3] of cuint8;

procedure av_picture_data_copy(dst_data: PQuaduint8Array; dst_linesize: TQuadIntArray;
                               src_data: PQuaduint8Array; src_linesize: TQuadIntArray;
                               pix_fmt:  TAVPixelFormat;  width: cint; height: cint);
  cdecl; external av__codec; deprecated;
{$IFEND}

(**
 * Copy image src to dst. Wraps av_picture_data_copy() above.
 *)
procedure av_picture_copy(dst: PAVPicture; 
              src: {const} PAVPicture;
              pix_fmt: TAVPixelFormat;
              width:  cint;
              height: cint);
  cdecl; external av__codec;

(**
 * Crop image top and left side.
 *)
function av_picture_crop(dst: PAVPicture;
              src: {const} PAVPicture;
              pix_fmt: TAVPixelFormat;
              top_band: cint;
              left_band: cint): cint;
  cdecl; external av__codec;

(**
 * Pad image.
 *)
function av_picture_pad(dst: PAVPicture;
            src: {const} PAVPicture;
            height: cint;
            width: cint;
            pix_fmt: TAVPixelFormat;
            padtop: cint;
            padbottom: cint;
            padleft: cint;
            padright:
            cint;
            color: PCint): cint;
  cdecl; external av__codec;

(**
 * Encode extradata length to a buffer. Used by xiph codecs.
 *
 * @param s buffer to write to; must be at least (v/255+1) bytes long
 * @param v size of extradata in bytes
 * @return number of bytes written to the buffer.
 *)
function av_xiphlacing(s: PByte; v: cuint): cuint;
  cdecl; external av__codec;

{$IF LIBAVCODEC_VERSION_MAJOR < 53}
(**
 * Parse str and put in width_ptr and height_ptr the detected values.
 *
 * @deprecated Deprecated in favor of av_parse_video_size().
 *)
function av_parse_video_frame_size(width_ptr: PCint; height_ptr: PCint; str: {const} PAnsiChar): cint;
  cdecl; external av__codec; deprecated;

(**
 * Parse str and store the detected values in *frame_rate.
 *
 * @deprecated Deprecated in favor of av_parse_video_rate().
 *)
function av_parse_video_frame_rate(frame_rate: PAVRational; str: {const} PAnsiChar): cint;
  cdecl; external av__codec; deprecated;
{$IFEND}

(**
 * Log a generic warning message about a missing feature. This function is
 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
 * only, and would normally not be used by applications.
 * @param[in] avc a pointer to an arbitrary struct of which the first field is
 * a pointer to an AVClass struct
 * @param[in] feature string containing the name of the missing feature
 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
 * If want_sample is non-zero, additional verbage will be added to the log
 * message which tells the user how to report samples to the development
 * mailing list.
 *)
procedure av_log_missing_feature(avc: Pointer; feature: {const} PAnsiChar; want_sample: cint);
  cdecl; external av__codec;

(**
 * Log a generic warning message asking for a sample. This function is
 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
 * only, and would normally not be used by applications.
 * @param[in] avc a pointer to an arbitrary struct of which the first field is
 * a pointer to an AVClass struct
 * @param[in] msg string containing an optional message, or NULL if no message
 *)
procedure av_log_ask_for_sample(avc: Pointer; msg: {const} PAnsiChar);
  cdecl; external av__codec;

(**
 * Register the hardware accelerator hwaccel.
 *)
procedure av_register_hwaccel (hwaccel: PAVHWAccel)
  cdecl; external av__codec;

(**
 * If hwaccel is NULL, returns the first registered hardware accelerator,
 * if hwaccel is non-NULL, returns the next registered hardware accelerator
 * after hwaccel, or NULL if hwaccel is the last one.
 *)
function av_hwaccel_next (hwaccel: PAVHWAccel): PAVHWAccel;
  cdecl; external av__codec;

(**
 * Lock operation used by lockmgr
 *)
type
  TAVLockOp = (
    AV_LOCK_CREATE,  ///< Create a mutex
    AV_LOCK_OBTAIN,  ///< Lock the mutex
    AV_LOCK_RELEASE, ///< Unlock the mutex
    AV_LOCK_DESTROY  ///< Free mutex resources
  );

(**
 * Register a user provided lock manager supporting the operations
 * specified by AVLockOp. mutex points to a (void) where the
 * lockmgr should store/get a pointer to a user allocated mutex. It's
 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
 *
 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
 *           callback during the call to av_lockmgr_register().
 *           Thus, the application must be prepared to handle that.
 *           If cb is set to NULL the lockmgr will be unregistered.
 *           Also note that during unregistration the previously registered
 *           lockmgr callback may also be invoked.
 *)
// ToDo: Implement and test this
//function av_lockmgr_register(cb: function (mutex: Ppointer; op: TAVLockOp)): cint;
//  cdecl; external av__codec;

implementation

end.