aboutsummaryrefslogtreecommitdiffstats
path: root/src/lib/ffmpeg-2.5/avio.pas
blob: c342f8de4f5040b08e8059e389b0d4eee74854ec (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
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
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
(*
 * copyright (c) 2001 Fabrice Bellard
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg 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 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg 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 FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, 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 libavformat/avio.h
 * unbuffered I/O operations
 * @warning This file has to be considered an internal but installed
 * header, so it should not be directly included in your projects.
 *
 * update to
 * avformat version: 56.4.101
 *)

unit avio;

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

{$I switches.inc}

interface

uses
  ctypes,
  {$IFDEF UNIX}
  BaseUnix,   // for SEEK_CUR
  {$ENDIF}
  avcodec,
  avutil,
  SysUtils,
  UConfig;

(**
 * Those FF_API_* defines are not part of public API.
 * They may change, break or disappear at any time.
 *)
const
  FF_API_URL_CLASS            = (LIBAVFORMAT_VERSION_MAJOR >= 53);

const
  AVIO_SEEKABLE_NORMAL = 0001; (**< Seeking works like for a local file *)

type
  TReadWriteFunc = function(opaque: Pointer; buf: PByteArray; buf_size: cint): cint; cdecl;
  TSeekFunc = function(opaque: Pointer; offset: cint64; whence: cint): cint64; cdecl;
  Tcallback = function(p: pointer): cint; cdecl;

type
(**
 * Callback for checking whether to abort blocking functions.
 * AVERROR_EXIT is returned in this case by the interrupted
 * function. During blocking operations, callback is called with
 * opaque as parameter. If the callback returns 1, the
 * blocking operation will be aborted.
 *
 * No members can be added to this struct without a major bump, if
 * new elements have been added after this struct in AVFormatContext
 * or AVIOContext.
 *)
  PAVIOInterruptCB = ^TAVIOInterruptCB;
  TAVIOInterruptCB = record
    callback: Tcallback;
    opaque: pointer;
  end; (*TAVIOInterruptCB*)

(**
 * Bytestream IO Context.
 * 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(AVIOContext) must not be used outside libav*.
 *
 * @note None of the function pointers in AVIOContext should be called
 *       directly, they should only be set by the client application
 *       when implementing custom I/O. Normally these are set to the
 *       function pointers specified in avio_alloc_context()
 *)
  PPAVIOContext = ^PAVIOContext;
  PAVIOContext = ^TAVIOContext;
  TAVIOContext = record
    (**
     * A class for private options.
     *
     * If this AVIOContext is created by avio_open2(), av_class is set and
     * passes the options down to protocols.
     *
     * If this AVIOContext is manually allocated, then av_class may be set by
     * the caller.
     *
     * warning -- this field can be NULL, be sure to not pass this AVIOContext
     * to any av_opt_* functions in that case.
     *)
    av_class: {const} PAVClass;
    buffer: PByteArray;  (**< Start of the buffer. *)
    buffer_size: cint;   (**< Maximum buffer size *)
    buf_ptr: PByteArray; (**< Current position in the buffer *)
    buf_end: PByteArray; (**< End of the data, may be less than
                              buffer+buffer_size if the read function returned
                              less data than requested, e.g. for streams where
                              no more data has been received yet. *)
    opaque: pointer;     (**< A private pointer, passed to the read/write/seek/...
                              functions. *)
    read_packet: TReadWriteFunc;
    write_packet: TReadWriteFunc;
    seek: TSeekFunc;
    pos: cint64;         (**< position in the file of the current buffer *)
    must_flush: cint;    (**< true if the next seek should flush *)
    eof_reached: cint;   (**< true if eof reached *)
    write_flag: cint;    (**< true if open for writing *)
    max_packet_size: cint;
    checksum: culong;
    checksum_ptr: PByteArray;
    update_checksum: function (checksum: culong; buf: {const} PAnsiChar; size: cuint): culong; cdecl;
    error: cint;         (**< contains the error code or 0 if no error happened *)
    (**
     * Pause or resume playback for network streaming protocols - e.g. MMS.
     *)
    read_pause: function(opaque: Pointer; pause: cint): cint; cdecl;
    (**
     * Seek to a given timestamp in stream with the specified stream_index.
     * Needed for some network streaming protocols which don't support seeking
     * to byte position.
     *)
    read_seek: function(opaque: Pointer; stream_index: cint;
                        timestamp: cint64; flags: cint): cint64; cdecl;
    (**
     * A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
     *)
    seekable: cint;

    (**
     * max filesize, used to limit allocations
     * This field is internal to libavformat and access from outside is not allowed.
     *)
    maxsize: cint64;

    (**
     * avio_read and avio_write should if possible be satisfied directly
     * instead of going through a buffer, and avio_seek will always
     * call the underlying seek function directly.
     *)
    direct: cint;

    (**
     * Bytes read statistic
     * This field is internal to libavformat and access from outside is not allowed.
     *)
    bytes_read: cint64;

    (**
     * seek statistic
     * This field is internal to libavformat and access from outside is not allowed.
     *)
    seek_count: cint;

    (**
     * writeout statistic
     * This field is internal to libavformat and access from outside is not allowed.
     *)
    writeout_count: cint;

    (**
     * Original buffer size
     * used internally after probing and ensure seekback to reset the buffer size
     * This field is internal to libavformat and access from outside is not allowed.
     *)
    orig_buffer_size: cint;
  end;

(* unbuffered I/O *)

(**
 * Return AVIO_* access flags corresponding to the access permissions
 * of the resource in url, or a negative value corresponding to an
 * AVERROR code in case of failure. The returned access flags are
 * masked by the value in flags.
 *
 * @note This function is intrinsically unsafe, in the sense that the
 * checked resource may change its existence or permission status from
 * one call to another. Thus you should not trust the returned value,
 * unless you are sure that no other processes are accessing the
 * checked resource.
 *)
function avio_check(url: {const} PAnsiChar; flags: cint): cint;
  cdecl; external av__format;

(**
 * Allocate and initialize an AVIOContext for buffered I/O. It must be later
 * freed with av_free().
 *
 * @param buffer Memory block for input/output operations via AVIOContext.
 *        The buffer must be allocated with av_malloc() and friends.
 *        It may be freed and replaced with a new buffer by libavformat.
 *        AVIOContext.buffer holds the buffer currently in use,
 *        which must be later freed with av_free().
 * @param buffer_size The buffer size is very important for performance.
 *        For protocols with fixed blocksize it should be set to this blocksize.
 *        For others a typical size is a cache page, e.g. 4kb.
 * @param write_flag Set to 1 if the buffer should be writable, 0 otherwise.
 * @param opaque An opaque pointer to user-specific data.
 * @param read_packet  A function for refilling the buffer, may be NULL.
 * @param write_packet A function for writing the buffer contents, may be NULL.
 *        The function may not change the input buffers content.
 * @param seek A function for seeking to specified byte position, may be NULL.
 *
 * @return Allocated AVIOContext or NULL on failure.
 *)
function avio_alloc_context(
                  buffer: PAnsiChar;
                  buffer_size: cint;
                  write_flag: cint;
                  opaque: Pointer;
                  read_packet: TReadWriteFunc;
                  write_packet: TReadWriteFunc;
                  seek: TSeekFunc): PAVIOContext;
  cdecl; external av__format;
		  
procedure avio_w8(s: PAVIOContext; b: cint);
  cdecl; external av__format;
procedure avio_write(s: PAVIOContext; buf: {const} PAnsiChar; size: cint);
  cdecl; external av__format;
procedure avio_wl64(s: PAVIOContext; val: cuint64);
  cdecl; external av__format;
procedure avio_wb64(s: PAVIOContext; val: cuint64);
  cdecl; external av__format;
procedure avio_wl32(s: PAVIOContext; val: cuint);
  cdecl; external av__format;
procedure avio_wb32(s: PAVIOContext; val: cuint);
  cdecl; external av__format;
procedure avio_wl24(s: PAVIOContext; val: cuint);
  cdecl; external av__format;
procedure avio_wb24(s: PAVIOContext; val: cuint);
  cdecl; external av__format;
procedure avio_wl16(s: PAVIOContext; val: cuint);
  cdecl; external av__format;
procedure avio_wb16(s: PAVIOContext; val: cuint);
  cdecl; external av__format;

(**
 * Write a NULL-terminated string.
 * @return number of bytes written.
 *)
function avio_put_str(s: PAVIOContext; str: {const} PAnsiChar): cint;
  cdecl; external av__format;

(**
 * Convert an UTF-8 string to UTF-16LE and write it.
 * @return number of bytes written.
 *)
function avio_put_str16le(s: PAVIOContext; str: {const} PAnsiChar): cint;
  cdecl; external av__format;

const
(**
 * Passing this as the "whence" parameter to a seek function causes it to
 * return the filesize without seeking anywhere. Supporting this is optional.
 * If it is not supported then the seek function will return <0.
 *)
  AVSEEK_SIZE = $10000;

(**
 * Oring this flag as into the "whence" parameter to a seek function causes it to
 * seek by any means (like reopening and linear reading) or other normally unreasonable
 * means that can be extremely slow.
 * This may be ignored by the seek code.
 *)
  AVSEEK_FORCE = $20000;

(**
 * fseek() equivalent for AVIOContext.
 * @return new position or AVERROR.
 *)
function avio_seek(s: PAVIOContext; offset: cint64; whence: cint): cint64;
  cdecl; external av__format;

(**
 * Skip given number of bytes forward
 * @return new position or AVERROR.
 *)
function avio_skip(s: PAVIOContext; offset: cint64): cint64;
  cdecl; external av__format;

{$IFDEF UNIX}
(**
 * ftell() equivalent for AVIOContext.
 * @return position or AVERROR.
 *)
function avio_tell(s: PAVIOContext): cint64; {$IFDEF HasInline}inline;{$ENDIF}
{$ELSE}
{$ENDIF}

(**
 * Get the filesize.
 * @return filesize or AVERROR
 *)
function avio_size(s: PAVIOContext): cint64;
  cdecl; external av__format;

(**
 * feof() equivalent for AVIOContext.
 * @return non zero if and only if end of file
 *)
function avio_feof(s: PAVIOContext): cint;
  cdecl; external av__format;
{$IFDEF FF_API_URL_FEOF}
(**
 * @deprecated use avio_feof()
 *)
function url_feof(s: PAVIOContext): cint;
  cdecl; external av__format; {attribute_deprecated}
{$ENDIF}
 
(** @warning currently size is limited *)
function avio_printf(s: PAVIOContext; fmt: {const} PAnsiChar; args: array of const): cint;
  cdecl; external av__format;

(**
 * Force flushing of buffered data.
 *
 * For write streams, force the buffered data to be immediately written to the output,
 * without to wait to fill the internal buffer.
 *
 * For read streams, discard all currently buffered data, and advance the
 * reported file position to that of the underlying stream. This does not
 * read new data, and does not perform any seeks.
 *)
procedure avio_flush(s: PAVIOContext);
  cdecl; external av__format;

(**
 * Read size bytes from AVIOContext into buf.
 * @return number of bytes read or AVERROR
 *)
function avio_read(s: PAVIOContext; buf: Pbyte; size: cint): cint;
  cdecl; external av__format;

(**
 * @name Functions for reading from AVIOContext
 * @
 *
 * @note return 0 if EOF, so you cannot use it if EOF handling is
 *       necessary
 *)
function avio_r8(s: PAVIOContext): cint;
  cdecl; external av__format;

function avio_rl16(s: PAVIOContext): cuint;
  cdecl; external av__format;

function avio_rl24(s: PAVIOContext): cuint;
  cdecl; external av__format;

function avio_rl32(s: PAVIOContext): cuint;
  cdecl; external av__format;

function avio_rl64(s: PAVIOContext): cuint64;
  cdecl; external av__format;

function avio_rb16(s: PAVIOContext): cuint;
  cdecl; external av__format;

function avio_rb24(s: PAVIOContext): cuint;
  cdecl; external av__format;

function avio_rb32(s: PAVIOContext): cuint;
  cdecl; external av__format;

function avio_rb64(s: PAVIOContext): cuint64;
  cdecl; external av__format;

(**
 * @
 *)
(**
 * Read a string from pb into buf. The reading will terminate when either
 * a NULL character was encountered, maxlen bytes have been read, or nothing
 * more can be read from pb. The result is guaranteed to be NULL-terminated, it
 * will be truncated if buf is too small.
 * Note that the string is not interpreted or validated in any way, it
 * might get truncated in the middle of a sequence for multi-byte encodings.
 *
 * @return number of bytes read (is always <= maxlen).
 * If reading ends on EOF or error, the return value will be one more than
 * bytes actually read.
 *)
function avio_get_str(pb: PAVIOContext; maxlen: cint; buf: PAnsiChar; buflen: cint): cint;
  cdecl; external av__format;

(**
 * Read a UTF-16 string from pb and convert it to UTF-8.
 * The reading will terminate when either a null or invalid character was
 * encountered or maxlen bytes have been read.
 * @return number of bytes read (is always <= maxlen)
 *)
function avio_get_str16le(pb: PAVIOContext; maxlen: cint; buf: PAnsiChar; buflen: cint): cint;
  cdecl; external av__format;

function avio_get_str16be(pb: PAVIOContext; maxlen: cint; buf: PAnsiChar; buflen: cint): cint;
  cdecl; external av__format;

(**
 * @name URL open modes
 * The flags argument to avio_open must be one of the following
 * constants, optionally ORed with other flags.
 * @{
 *)
const
  AVIO_FLAG_READ  = 1;                                      (**< read-only *)
  AVIO_FLAG_WRITE = 2;                                      (**< write-only *)
  AVIO_FLAG_READ_WRITE = {(AVIO_FLAG_READ|AVIO_FLAG_WRITE)} 3;  (**< read-write pseudo flag *)
(**
 * @
 *)

const
(**
 * Use non-blocking mode.
 * If this flag is set, operations on the context will return
 * AVERROR(EAGAIN) if they can not be performed immediately.
 * If this flag is not set, operations on the context will never return
 * AVERROR(EAGAIN).
 * Note that this flag does not affect the opening/connecting of the
 * context. Connecting a protocol will always block if necessary (e.g. on
 * network protocols) but never hang (e.g. on busy devices).
 * Warning:  non-blocking protocols is work-in-progress; this flag may be
 * silently ignored.
 *)
  AVIO_FLAG_NONBLOCK = 8;    

(**
 * Use direct mode.
 * avio_read and avio_write should if possible be satisfied directly
 * instead of going through a buffer, and avio_seek will always
 * call the underlying seek function directly.
 *)
  AVIO_FLAG_DIRECT = $8000;

(**
 * Create and initialize a AVIOContext for accessing the
 * resource indicated by url.
 * @note When the resource indicated by url has been opened in
 * read+write mode, the AVIOContext can be used only for writing.
 *
 * @param s Used to return the pointer to the created AVIOContext.
 * In case of failure the pointed to value is set to NULL.
 * @param flags flags which control how the resource indicated by url
 * is to be opened
 * @return 0 in case of success, a negative value corresponding to an
 * AVERROR code in case of failure
 *)
function avio_open(s: PPAVIOContext; url: {const} PAnsiChar; flags: cint): cint;
  cdecl; external av__format;

(**
 * Create and initialize a AVIOContext for accessing the
 * resource indicated by url.
 * @note When the resource indicated by url has been opened in
 * read+write mode, the AVIOContext can be used only for writing.
 *
 * @param s Used to return the pointer to the created AVIOContext.
 * In case of failure the pointed to value is set to NULL.
 * @param flags flags which control how the resource indicated by url
 * is to be opened
 * @param int_cb an interrupt callback to be used at the protocols level
 * @param options  A dictionary filled with protocol-private options. On return
 * this parameter will be destroyed and replaced with a dict containing options
 * that were not found. May be NULL.
 * @return 0 in case of success, a negative value corresponding to an
 * AVERROR code in case of failure
 *)
function avio_open2(s: PPAVIOContext; {const} url: PAnsiChar; flags: cint;
	{const} int_cb: PAVIOInterruptCB; options: PPAVDictionary): cint;
  cdecl; external av__format;

(**
 * Close the resource accessed by the AVIOContext s and free it.
 * This function can only be used if s was opened by avio_open().
 *
 * The internal buffer is automatically flushed before closing the
 * resource.
 *
 * @return 0 on success, an AVERROR < 0 on error.
 * @see avio_close
 *)
function avio_close(s: PAVIOContext): cint;
  cdecl; external av__format;

(**
 * Close the resource accessed by the AVIOContext *s, free it
 * and set the pointer pointing to it to NULL.
 * This function can only be used if s was opened by avio_open().
 *
 * The internal buffer is automatically flushed before closing the
 * resource.
 *
 * @return 0 on success, an AVERROR < 0 on error.
 * @see avio_close
 *)
function avio_closep(s: PPAVIOContext): cint;
  cdecl; external av__format;

(**
 * Open a write only memory stream.
 *
 * @param s new IO context
 * @return zero if no error.
 *)
function avio_open_dyn_buf(s: PPAVIOContext): cint;
  cdecl; external av__format;

(**
 * Return the written size and a pointer to the buffer. The buffer
 * must be freed with av_free().
 * Padding of FF_INPUT_BUFFER_PADDING_SIZE is added to the buffer.
 *
 * @param s IO context
 * @param pbuffer pointer to a byte buffer
 * @return the length of the byte buffer
 *)
function avio_close_dyn_buf(s: PAVIOContext; var pbuffer: Pcuint8): cint;
  cdecl; external av__format;

(**
 * Iterate through names of available protocols.
 *
 * @param opaque A private pointer representing current protocol.
 *        It must be a pointer to NULL on first iteration and will
 *        be updated by successive calls to avio_enum_protocols.
 * @param output If set to 1, iterate over output protocols,
 *               otherwise over input protocols.
 *
 * @return A static string containing the name of current protocol or NULL
 *)
function avio_enum_protocols(var opaque: Pointer; output: cint): {const} PAnsiChar;
  cdecl; external av__format;

(**
 * Pause and resume playing - only meaningful if using a network streaming
 * protocol (e.g. MMS).
 * @param pause 1 for pause, 0 for resume
 *)
function avio_pause(h: PAVIOContext; pause: cint): cint;
  cdecl; external av__format;

(**
 * Seek to a given timestamp relative to some component stream.
 * Only meaningful if using a network streaming protocol (e.g. MMS.).
 * @param stream_index The stream index that the timestamp is relative to.
 *        If stream_index is (-1) the timestamp should be in AV_TIME_BASE
 *        units from the beginning of the presentation.
 *        If a stream_index >= 0 is used and the protocol does not support
 *        seeking based on component streams, the call will fail with ENOTSUP.
 * @param timestamp timestamp in AVStream.time_base units
 *        or if there is no stream specified then in AV_TIME_BASE units.
 * @param flags Optional combination of AVSEEK_FLAG_BACKWARD, AVSEEK_FLAG_BYTE
 *        and AVSEEK_FLAG_ANY. The protocol may silently ignore
 *        AVSEEK_FLAG_BACKWARD and AVSEEK_FLAG_ANY, but AVSEEK_FLAG_BYTE will
 *        fail with ENOTSUP if used and not supported.
 * @return >= 0 on success
 * @see AVInputFormat: : read_seek
 *)
function avio_seek_time(h: PAVIOContext; stream_index: cint;
                        timestamp: cint64; flags: cint): cint64;
  cdecl; external av__format;

(* Avoid a warning. The header can not be included because it breaks c++. *)
type
  PAVBPrint = ^TAVBPrint;
  TAVBPrint = record
	end;	

(**
 * Read contents of h into print buffer, up to max_size bytes, or up to EOF.
 *
 * @return 0 for success (max_size bytes read or EOF reached), negative error
 * code otherwise
 *)
function avio_read_to_bprint(h: PAVIOContext; pb: PAVBPrint; max_size: size_t): cint;
  cdecl; external av__format;

implementation

(**
 * For SEEK_CUR on Windows
 * values taken from stdio.h of C
 *)
{$IFNDEF SEEK_SET}
const
  SEEK_SET = 0;
{$ENDIF}

{$IFNDEF SEEK_CUR}
const
  SEEK_CUR = 1;
{$ENDIF}

{$IFNDEF SEEK_END}
const
  SEEK_END = 2;
{$ENDIF}

function avio_tell(s: PAVIOContext): cint64; {$IFDEF HasInline}inline;{$ENDIF}
begin
  Result := avio_seek(s, 0, SEEK_CUR);
end;


end.