aboutsummaryrefslogtreecommitdiffstats
path: root/Game/Code/Classes/UVideo.pas
blob: 42971dafcc9b71deb20a014a8e8ae76e0405a7b8 (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
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
unit UVideo;
{< #############################################################################
#                    FFmpeg support for UltraStar deluxe                       #
#                                                                              #
#    Created by b1indy                                                         #
#    based on 'An ffmpeg and SDL Tutorial' (http://www.dranger.com/ffmpeg/)    #
#                                                                              #
# http://www.mail-archive.com/fpc-pascal@lists.freepascal.org/msg09949.html    #
# http://www.nabble.com/file/p11795857/mpegpas01.zip                           #
#                                                                              #
############################################################################## }

//{$define DebugDisplay}  // uncomment if u want to see the debug stuff
//{$define DebugFrames}
//{$define Info}

interface

{$IFDEF FPC}
  {$MODE Delphi}
{$ENDIF}

{$I switches.inc}

(*

  look into
  av_read_play

*)

implementation

uses SDL,
     UGraphicClasses,
     textgl,
     avcodec,
     avformat,
     avutil,
//     swscale,
     math,
     OpenGL12,
     SysUtils,
     {$ifdef DebugDisplay}
     {$ifdef win32}
     dialogs,
     {$endif}
     {$ENDIF}
     {$ifdef UseFFMpegAudio}
     UAudio_FFMpeg,
     {$endif}
     UIni,
     UMusic,
     UGraphic;


var
  singleton_VideoFFMpeg : IVideoPlayback;

type
    TVideoPlayback_ffmpeg = class( TInterfacedObject, IVideoPlayback )
    private
      fVideoOpened   ,
      fVideoPaused   : Boolean;

      fVideoTex      : glUint;
      fVideoSkipTime : Single;

      //remove
      fTexData       : array of Byte;

      VideoFormatContext: PAVFormatContext;

      VideoStreamIndex ,
      AudioStreamIndex : Integer;
      VideoCodecContext: PAVCodecContext;
      VideoCodec: PAVCodec;
      AVFrame: PAVFrame;
      AVFrameRGB: PAVFrame;
      myBuffer: pByte;

//      SoftwareScaleContext: PSwsContext;

      TexX, TexY, dataX, dataY: Cardinal;

      ScaledVideoWidth, ScaledVideoHeight: Real;
      VideoAspect: Real;
      VideoTextureU, VideoTextureV: Real;
      VideoTimeBase, VideoTime, LastFrameTime, TimeDifference: Extended;


      WantedAudioCodecContext,
      AudioCodecContext : PSDL_AudioSpec;
      aCodecCtx         : PAVCodecContext;


      function find_stream_ids( const aFormatCtx : PAVFormatContext; Out aFirstVideoStream, aFirstAudioStream : integer ): boolean;
    public
      constructor create();
      function    GetName: String;
      procedure   init();

      function    Open( aFileName : string): boolean; // true if succeed
      procedure   Close;

      procedure   Play;
      procedure   Pause;
      procedure   Stop;

      procedure   MoveTo(Time: real);
      function    getPosition: real;

      procedure   GetFrame(Time: Extended);
      procedure   DrawGL(Screen: integer);

    end;

    const
  SDL_AUDIO_BUFFER_SIZE = 1024;

{$ifdef DebugDisplay}
//{$ifNdef win32}

procedure showmessage( aMessage : String );
begin
  writeln( aMessage );
end;

//{$endif}
{$ENDIF}

{ ------------------------------------------------------------------------------
asdf
------------------------------------------------------------------------------ }

function  TVideoPlayback_ffmpeg.GetName: String;
begin
  result := 'FFMpeg';
end;

{
  @author(Jay Binks <jaybinks@gmail.com>)
  @created(2007-10-09)
  @lastmod(2007-10-09)

  @param(aFormatCtx is a PAVFormatContext returned from av_open_input_file )
  @param(aFirstVideoStream is an OUT value of type integer, this is the index of the video stream)
  @param(aFirstAudioStream is an OUT value of type integer, this is the index of the audio stream)
  @returns(@true on success, @false otherwise)

  translated from "Setting Up the Audio" section at
  http://www.dranger.com/ffmpeg/ffmpegtutorial_all.html
}
function TVideoPlayback_ffmpeg.find_stream_ids( const aFormatCtx : PAVFormatContext; Out aFirstVideoStream, aFirstAudioStream : integer ): boolean;
var
  i : integer;
  st : pAVStream;
begin
  // Find the first video stream
  aFirstAudioStream := -1;
  aFirstVideoStream := -1;

  writeln( ' aFormatCtx.nb_streams : ' + inttostr( aFormatCtx.nb_streams ) );
  writeln( ' length( aFormatCtx.streams ) : ' + inttostr( length(aFormatCtx.streams) ) );

  i := 0;
  while ( i < aFormatCtx.nb_streams ) do
//  while ( i < length(aFormatCtx.streams)-1 ) do
  begin
    writeln( ' aFormatCtx.streams[i] : ' + inttostr( i ) );
    st := aFormatCtx.streams[i];

    if(st.codec.codec_type = CODEC_TYPE_VIDEO ) AND
      (aFirstVideoStream < 0) THEN
    begin
      aFirstVideoStream := i;
    end;

    if ( st.codec.codec_type = CODEC_TYPE_AUDIO ) AND
       ( aFirstAudioStream < 0) THEN
    begin
      aFirstAudioStream := i;
    end;

    inc( i );
  end; // while

  result := (aFirstAudioStream > -1) OR
            (aFirstVideoStream > -1) ;  // Didn't find a video stream
end;




procedure TVideoPlayback_ffmpeg.GetFrame(Time: Extended);
var
  FrameFinished: Integer;
  AVPacket: TAVPacket;
  errnum, x, y: Integer;
  FrameDataPtr: PByteArray;
  linesize: integer;
  myTime: Extended;
  DropFrame: Boolean;
  droppedFrames: Integer;
const
  FRAMEDROPCOUNT=3;
begin
  if not fVideoOpened then Exit;

  if fVideoPaused then Exit;

  myTime         := Time   + fVideoSkipTime;
  TimeDifference := myTime - VideoTime;
  DropFrame      := False;

{$IFDEF DebugDisplay}
  showmessage('Time:      '+inttostr(floor(Time*1000))+#13#10+
    'VideoTime: '+inttostr(floor(VideoTime*1000))+#13#10+
    'TimeBase:  '+inttostr(floor(VideoTimeBase*1000))+#13#10+
    'TimeDiff:  '+inttostr(floor(TimeDifference*1000)));
{$endif}

  if (VideoTime <> 0) and (TimeDifference <= VideoTimeBase) then
  begin
{$ifdef DebugFrames}
    // frame delay debug display
    GoldenRec.Spawn(200,15,1,16,0,-1,ColoredStar,$00ff00);
{$endif}

{$IFDEF DebugDisplay}
    showmessage('not getting new frame'+#13#10+
    'Time:      '+inttostr(floor(Time*1000))+#13#10+
    'VideoTime: '+inttostr(floor(VideoTime*1000))+#13#10+
    'TimeBase:  '+inttostr(floor(VideoTimeBase*1000))+#13#10+
    'TimeDiff:  '+inttostr(floor(TimeDifference*1000)));
{$endif}

    Exit;// we don't need a new frame now
  end;


  VideoTime:=VideoTime+VideoTimeBase;
  TimeDifference:=myTime-VideoTime;
  if TimeDifference >= (FRAMEDROPCOUNT-1)*VideoTimeBase then  // skip frames
  begin
{$ifdef DebugFrames}
    //frame drop debug display
    GoldenRec.Spawn(200,55,1,16,0,-1,ColoredStar,$ff0000);
{$endif}

{$IFDEF DebugDisplay}

    showmessage('skipping frames'+#13#10+
    'TimeBase:  '+inttostr(floor(VideoTimeBase*1000))+#13#10+
    'TimeDiff:  '+inttostr(floor(TimeDifference*1000))+#13#10+
    'Time2Skip: '+inttostr(floor((Time-LastFrameTime)*1000)));

{$endif}
//    av_seek_frame(VideoFormatContext.,VideoStreamIndex,Floor(Time*VideoTimeBase),0);
{    av_seek_frame(VideoFormatContext,-1,Floor((myTime+VideoTimeBase)*1500000),0);
    VideoTime:=floor(myTime/VideoTimeBase)*VideoTimeBase;}
    VideoTime:=VideoTime+FRAMEDROPCOUNT*VideoTimeBase;
    DropFrame:=True;
  end;


//  av_init_packet(@AVPacket);
  AVPacket.data := nil;
  av_init_packet( AVPacket ); // JB-ffmpeg


  FrameFinished:=0;
  // read packets until we have a finished frame (or there are no more packets)
  while ( FrameFinished = 0                                ) and
        ( av_read_frame(VideoFormatContext, AVPacket) >= 0 ) do     // JB-ffmpeg
  begin


    // if we got a packet from the video stream, then decode it
    if (AVPacket.stream_index=VideoStreamIndex) then
    begin
      errnum := avcodec_decode_video(VideoCodecContext, AVFrame,  frameFinished , AVPacket.data, AVPacket.size); // JB-ffmpeg
    (* FIXME
    {$ifdef UseFFMpegAudio}
    end
    else
    if (AVPacket.stream_index = AudioStreamIndex ) then
    begin
      writeln('Encue Audio packet');
      audioq.put(AVPacket);
    {$endif}
    *)
    end;

      try
        if AVPacket.data <> nil then
          av_free_packet( AVPacket );  // JB-ffmpeg
      except
        // TODO : JB_FFMpeg ... why does this now AV sometimes ( or always !! )
      end;

  end;


  if DropFrame then
    for droppedFrames:=1 to FRAMEDROPCOUNT do begin
      FrameFinished:=0;
      // read packets until we have a finished frame (or there are no more packets)
//      while (FrameFinished=0) and (av_read_frame(VideoFormatContext, @AVPacket)>=0) do
      while (FrameFinished=0) and (av_read_frame(VideoFormatContext, AVPacket)>=0) do  // JB-ffmpeg
      begin
        // if we got a packet from the video stream, then decode it
        if (AVPacket.stream_index=VideoStreamIndex) then
//          errnum:=avcodec_decode_video(VideoCodecContext, AVFrame, @frameFinished, AVPacket.data, AVPacket.size);
      errnum:=avcodec_decode_video(VideoCodecContext, AVFrame,  frameFinished , AVPacket.data, AVPacket.size); // JB-ffmpeg


        // release internal packet structure created by av_read_frame
//          av_free_packet(PAVPacket(@AVPacket)); // JB-ffmpeg
          av_free_packet( AVPacket );
      end;
    end;

  // if we did not get an new frame, there's nothing more to do
  if Framefinished=0 then begin
    GoldenRec.Spawn(220,15,1,16,0,-1,ColoredStar,$0000ff);
    Exit;
  end;
  // otherwise we convert the pixeldata from YUV to RGB
  errnum:=img_convert(PAVPicture(AVFrameRGB), PIX_FMT_RGB24,
            PAVPicture(AVFrame), VideoCodecContext^.pix_fmt,
			      VideoCodecContext^.width, VideoCodecContext^.height);
//errnum:=1;
{
  writeln('swscontext->srcH='+inttostr(SoftwareScaleContext^.srcH));
  writeln('swscontext->dstH='+inttostr(SoftwareScaleContext^.dstH));
  writeln('swscontext->slicedir='+inttostr(SoftwareScaleContext^.slicedir));
  errnum:=sws_scale(SoftwareScaleContext,@(AVFrame.data),@(AVFrame.linesize),
          0,VideoCodecContext^.Height,
          @(AVFrameRGB.data),@(AVFrameRGB.linesize));
  writeln('errnum='+inttostr(errnum));
}
  if errnum >=0 then
  begin
  glBindTexture(GL_TEXTURE_2D, fVideoTex);
  glTexImage2D(GL_TEXTURE_2D, 0, 3, dataX, dataY, 0, GL_RGB, GL_UNSIGNED_BYTE, AVFrameRGB^.data[0]);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
(*    // copy RGB pixeldata to our TextureBuffer
    // (line by line)

    FrameDataPtr := pointer( AVFrameRGB^.data[0] );
    linesize     := AVFrameRGB^.linesize[0];
    for y:=0 to TexY-1 do
    begin
      System.Move(FrameDataPtr[y*linesize],fTexData[3*y*dataX],linesize);
    end;

    // generate opengl texture out of whatever we got
    glBindTexture(GL_TEXTURE_2D, fVideoTex);
    glTexImage2D(GL_TEXTURE_2D, 0, 3, dataX, dataY, 0, GL_RGB, GL_UNSIGNED_BYTE, fTexData);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
*)
{$ifdef DebugFrames}
    //frame decode debug display
    GoldenRec.Spawn(200,35,1,16,0,-1,ColoredStar,$ffff00);
{$endif}

  end;
end;

procedure TVideoPlayback_ffmpeg.DrawGL(Screen: integer);
begin
  // have a nice black background to draw on (even if there were errors opening the vid)
  if Screen=1 then
  begin
    glClearColor(0,0,0,0);
    glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT);
  end;
  // exit if there's nothing to draw
  if not fVideoOpened then Exit;

  glEnable(GL_TEXTURE_2D);
  glEnable(GL_BLEND);
  glColor4f(1, 1, 1, 1);
  glBindTexture(GL_TEXTURE_2D, fVideoTex);
  glbegin(gl_quads);
    glTexCoord2f(         0,          0); glVertex2f(400-ScaledVideoWidth/2, 300-ScaledVideoHeight/2);
    glTexCoord2f(         0, TexY/dataY); glVertex2f(400-ScaledVideoWidth/2, 300+ScaledVideoHeight/2);
    glTexCoord2f(TexX/dataX, TexY/dataY); glVertex2f(400+ScaledVideoWidth/2, 300+ScaledVideoHeight/2);
    glTexCoord2f(TexX/dataX,          0); glVertex2f(400+ScaledVideoWidth/2, 300-ScaledVideoHeight/2);
  glEnd;
  glDisable(GL_TEXTURE_2D);
  glDisable(GL_BLEND);

{$ifdef Info}
  if VideoSkipTime+VideoTime+VideoTimeBase < 0 then
  begin
    glColor4f(0.7, 1, 0.3, 1);
    SetFontStyle (1);
    SetFontItalic(False);
    SetFontSize(9);
    SetFontPos (300, 0);
    glPrint('Delay due to negative VideoGap');
    glColor4f(1, 1, 1, 1);
  end;
{$endif}

{$ifdef DebugFrames}
    glColor4f(0, 0, 0, 0.2);
    glbegin(gl_quads);
      glVertex2f(0, 0);
      glVertex2f(0, 70);
      glVertex2f(250, 70);
      glVertex2f(250, 0);
    glEnd;

    glColor4f(1,1,1,1);
    SetFontStyle (1);
    SetFontItalic(False);
    SetFontSize(9);
    SetFontPos (5, 0);
    glPrint('delaying frame');
    SetFontPos (5, 20);
    glPrint('fetching frame');
    SetFontPos (5, 40);
    glPrint('dropping frame');
{$endif}
end;

constructor TVideoPlayback_ffmpeg.create();
begin
  av_register_all;

  fVideoOpened := False;
  fVideoPaused := False;
end;

procedure TVideoPlayback_ffmpeg.init();
begin
  glGenTextures(1, PglUint(@fVideoTex));
  SetLength(fTexData,0);
end;


function TVideoPlayback_ffmpeg.Open( aFileName : string): boolean; // true if succeed
var
  errnum, i, x,y: Integer;
  lStreamsCount : Integer;

  wanted_spec   ,
  spec          : TSDL_AudioSpec;
  aCodec        : pAVCodec;

  sws_dst_w, sws_dst_h: Integer;

begin
  fVideoOpened       := False;
  fVideoPaused       := False;
  VideoTimeBase      := 0;
  VideoTime          := 0;
  LastFrameTime      := 0;
  TimeDifference     := 0;
  VideoFormatContext := 0;

//  writeln( aFileName );

  errnum         := av_open_input_file(VideoFormatContext, pchar( aFileName ), Nil, 0, Nil);
//  writeln( 'Errnum : ' +inttostr( errnum ));
  if(errnum <> 0) then
  begin
{$ifdef DebugDisplay}
    case errnum of
      AVERROR_UNKNOWN: showmessage('failed to open file '+aFileName+#13#10+'AVERROR_UNKNOWN');
      AVERROR_IO: showmessage('failed to open file '+aFileName+#13#10+'AVERROR_IO');
      AVERROR_NUMEXPECTED: showmessage('failed to open file '+aFileName+#13#10+'AVERROR_NUMEXPECTED');
      AVERROR_INVALIDDATA: showmessage('failed to open file '+aFileName+#13#10+'AVERROR_INVALIDDATA');
      AVERROR_NOMEM: showmessage('failed to open file '+aFileName+#13#10+'AVERROR_NOMEM');
      AVERROR_NOFMT: showmessage('failed to open file '+aFileName+#13#10+'AVERROR_NOFMT');
      AVERROR_NOTSUPP: showmessage('failed to open file '+aFileName+#13#10+'AVERROR_NOTSUPP');
    else showmessage('failed to open file '+aFileName+#13#10+'Error number: '+inttostr(Errnum));
    end;
{$ENDIF}
    Exit;
  end
  else
  begin
    VideoStreamIndex := -1;
    AudioStreamIndex := -1;

    // Find which stream contains the video
    if( av_find_stream_info(VideoFormatContext) >= 0 ) then
    begin
      find_stream_ids( VideoFormatContext, VideoStreamIndex, AudioStreamIndex );

      writeln( 'VideoStreamIndex : ' + inttostr(VideoStreamIndex) );
      writeln( 'AudioStreamIndex : ' + inttostr(AudioStreamIndex) );
    end;
    // FIXME: AudioStreamIndex is -1 if video has no sound -> memory access error
    // Just a temporary workaround for now
    aCodecCtx := nil;
    if( AudioStreamIndex >= 0) then
      aCodecCtx := VideoFormatContext.streams[ AudioStreamIndex ].codec;

    (* FIXME
    {$ifdef UseFFMpegAudio}
  // This is the audio ffmpeg audio support Jay is working on.
    if aCodecCtx <> nil then
    begin
      wanted_spec.freq     := aCodecCtx.sample_rate;
      wanted_spec.format   := AUDIO_S16SYS;
      wanted_spec.channels := aCodecCtx.channels;
      wanted_spec.silence  := 0;
      wanted_spec.samples  := SDL_AUDIO_BUFFER_SIZE;
      wanted_spec.callback := UAudio_FFMpeg.audio_callback;
      wanted_spec.userdata := aCodecCtx;


      if (SDL_OpenAudio(@wanted_spec, @spec) < 0) then
      begin
        writeln('SDL_OpenAudio: '+SDL_GetError());
        exit;
      end;

      writeln( 'SDL opened audio device' );

      aCodec := avcodec_find_decoder(aCodecCtx.codec_id);
      if (aCodec = nil) then
      begin
        writeln('Unsupported codec!');
        exit;
      end;

      avcodec_open(aCodecCtx, aCodec);

      writeln( 'Opened the codec' );

      packet_queue_init( audioq );
      SDL_PauseAudio(0);

      writeln( 'SDL_PauseAudio' );


    end;
    {$endif}
    *)

    if(VideoStreamIndex >= 0) then
    begin
      VideoCodecContext:=VideoFormatContext^.streams[VideoStreamIndex]^.codec;
      VideoCodec:=avcodec_find_decoder(VideoCodecContext^.codec_id);
    end
    else
    begin
{$ifdef DebugDisplay}
      showmessage('found no video stream');
{$ENDIF}
      av_close_input_file(VideoFormatContext);
      Exit;
    end;


    if(VideoCodec<>Nil) then
    begin
      errnum:=avcodec_open(VideoCodecContext, VideoCodec);
    end else begin
{$ifdef DebugDisplay}
      showmessage('no matching codec found');
{$ENDIF}
      avcodec_close(VideoCodecContext);
      av_close_input_file(VideoFormatContext);
      Exit;
    end;
    if(errnum >=0) then
    begin
      if (VideoCodecContext^.width >1024) or (VideoCodecContext^.height >1024) then
      begin
        ScreenPopupError.ShowPopup('Video dimensions\nmust not exceed\n1024 pixels\n\nvideo disabled'); //show error message
        avcodec_close(VideoCodecContext);
        av_close_input_file(VideoFormatContext);
        Exit;
      end;
{$ifdef DebugDisplay}
       showmessage('Found a matching Codec: '+ VideoCodecContext^.Codec.Name +#13#10#13#10+
        '  Width = '+inttostr(VideoCodecContext^.width)+ ', Height='+inttostr(VideoCodecContext^.height)+#13#10+
        '  Aspect    : '+inttostr(VideoCodecContext^.sample_aspect_ratio.num)+'/'+inttostr(VideoCodecContext^.sample_aspect_ratio.den)+#13#10+
        '  Framerate : '+inttostr(VideoCodecContext^.time_base.num)+'/'+inttostr(VideoCodecContext^.time_base.den));
{$endif}
      // allocate space for decoded frame and rgb frame
      AVFrame:=avcodec_alloc_frame;
      AVFrameRGB:=avcodec_alloc_frame;
    end;

    dataX := Round(Power(2, Ceil(Log2(VideoCodecContext^.width))));
    dataY := Round(Power(2, Ceil(Log2(VideoCodecContext^.height))));
    myBuffer:=Nil;
    if(AVFrame <> Nil) and (AVFrameRGB <> Nil) then
    begin
      myBuffer:=av_malloc(avpicture_get_size(PIX_FMT_RGB24, dataX, dataY));
//      myBuffer:=av_malloc(avpicture_get_size(PIX_FMT_RGB24, VideoCodecContext^.width, VideoCodecContext^.height));
    end;
    if myBuffer <> Nil then errnum:=avpicture_fill(PAVPicture(AVFrameRGB), myBuffer, PIX_FMT_RGB24,
//                VideoCodecContext^.width, VideoCodecContext^.height)
                dataX, dataY)
    else begin
      {$ifdef DebugDisplay}
      showmessage('failed to allocate video buffer');
      {$endif}
      av_free(AVFrameRGB);
      av_free(AVFrame);
      avcodec_close(VideoCodecContext);
      av_close_input_file(VideoFormatContext);
      Exit;
    end;
{
    writeln('trying to get sws context: '+inttostr(VideoCodecContext^.width)+'x'+
      inttostr(VideoCodecContext^.height)+' -> '+inttostr(dataX)+'x'+inttostr(dataY));
    SoftwareScaleContext:=Nil;
    SoftwareScaleContext:=sws_getContext(VideoCodecContext^.width,VideoCodecContext^.height,integer(VideoCodecContext^.pix_fmt),
                                         dataX, dataY, integer(PIX_FMT_RGB24),
                                         SWS_FAST_BILINEAR, 0, 0, 0);
    if SoftwareScaleContext <> Nil then
        writeln('got swscale context')
    else begin
      writeln('ERROR: didn�t get swscale context');
      av_free(AVFrameRGB);
      av_free(AVFrame);
      avcodec_close(VideoCodecContext);
      av_close_input_file(VideoFormatContext);
      Exit;
    end;
}
    // this is the errnum from avpicture_fill
    if errnum >=0 then
    begin
      fVideoOpened:=True;

      TexX := VideoCodecContext^.width;
      TexY := VideoCodecContext^.height;
      dataX := Round(Power(2, Ceil(Log2(TexX))));
      dataY := Round(Power(2, Ceil(Log2(TexY))));
      SetLength(fTexData,dataX*dataY*3);
      // calculate some information for video display
      VideoAspect:=VideoCodecContext^.sample_aspect_ratio.num/VideoCodecContext^.sample_aspect_ratio.den;
      if (VideoAspect = 0) then
        VideoAspect:=VideoCodecContext^.width/VideoCodecContext^.height
      else
        VideoAspect:=VideoAspect*VideoCodecContext^.width/VideoCodecContext^.height;
      if VideoAspect >= 4/3 then
      begin
        ScaledVideoWidth:=800.0;
        ScaledVideoHeight:=800.0/VideoAspect;
      end else
      begin
        ScaledVideoHeight:=600.0;
        ScaledVideoWidth:=600.0*VideoAspect;
      end;
      VideoTimeBase:=VideoCodecContext^.time_base.num/VideoCodecContext^.time_base.den;
      // hack to get reasonable timebase for divx
{$ifdef DebugDisplay}
      showmessage('framerate: '+inttostr(floor(1/videotimebase))+'fps');
{$endif}
      if VideoTimeBase < 0.02 then // 0.02 <-> 50 fps
      begin
        VideoTimeBase:=VideoCodecContext^.time_base.den/VideoCodecContext^.time_base.num;
        while VideoTimeBase > 50 do VideoTimeBase:=VideoTimeBase/10;
        VideoTimeBase:=1/VideoTimeBase;
      end;
{$ifdef DebugDisplay}
      showmessage('corrected framerate: '+inttostr(floor(1/videotimebase))+'fps');
      
      if ((VideoAspect*VideoCodecContext^.width*VideoCodecContext^.height)>200000) then
        showmessage('you are trying to play a rather large video'+#13#10+
                    'be prepared to experience some timing problems');
{$endif}
    end;
  end;
end;

procedure TVideoPlayback_ffmpeg.Close;
begin
  if fVideoOpened then
  begin
    av_free(myBuffer);
    av_free(AVFrameRGB);
    av_free(AVFrame);

    avcodec_close(VideoCodecContext);
    av_close_input_file(VideoFormatContext);

    SetLength(fTexData,0);

    fVideoOpened:=False;
  end;
end;

procedure TVideoPlayback_ffmpeg.Play;
begin
end;

procedure TVideoPlayback_ffmpeg.Pause;
begin
  fVideoPaused := not fVideoPaused;
end;

procedure TVideoPlayback_ffmpeg.Stop;
begin
end;

procedure TVideoPlayback_ffmpeg.MoveTo(Time: real);
begin
  fVideoSkipTime := Time;
  
  if fVideoSkipTime > 0 then
  begin
    av_seek_frame(VideoFormatContext,-1,Floor((fVideoSkipTime)*1500000),0);

    VideoTime := fVideoSkipTime;
  end;
end;

function  TVideoPlayback_ffmpeg.getPosition: real;
begin
  result := 0;  
end;

initialization
  singleton_VideoFFMpeg := TVideoPlayback_ffmpeg.create();
  AudioManager.add( singleton_VideoFFMpeg );

finalization
  AudioManager.Remove( singleton_VideoFFMpeg );


end.