libmpdemux/video.c

   1 // read video frame
   2
   3 #include "config.h"
   4
   5 #include <stdio.h>
   6 #ifdef HAVE_MALLOC_H
   7 #include <malloc.h>
   8 #endif
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <unistd.h>
  12
  13 #include "mp_msg.h"
  14 #include "help_mp.h"
  15
  16 #include "stream/stream.h"
  17 #include "demuxer.h"
  18 #include "stheader.h"
  19 #include "parse_es.h"
  20 #include "mpeg_hdr.h"
  21
  22 /* sub_cc (closed captions)*/
  23 #include "sub_cc.h"
  24
  25 #ifdef USE_LIBAVCODEC_SO
  26 #include <ffmpeg/avcodec.h>
  27 #elif defined(USE_LIBAVCODEC)
  28 #include "libavcodec/avcodec.h"
  29 #else
  30 #define FF_INPUT_BUFFER_PADDING_SIZE 8
  31 #endif
  32
  33 /* biCompression constant */
  34 #define BI_RGB        0L
  35
  36 #ifdef STREAMING_LIVE555
  37 #include "demux_rtp.h"
  38 #endif
  39
  40 static mp_mpeg_header_t picture;
  41
  42 static int telecine=0;
  43 static float telecine_cnt=-2.5;
  44
  45 typedef enum {
  46   VIDEO_MPEG12,
  47   VIDEO_MPEG4,
  48   VIDEO_H264,
  49   VIDEO_VC1,
  50   VIDEO_OTHER
  51 } video_codec_t;
  52
  53 static video_codec_t find_video_codec(sh_video_t *sh_video)
  54 {
  55   demux_stream_t *d_video=sh_video->ds;
  56   int fmt = d_video->demuxer->file_format;
  57
  58   if(
  59     (fmt == DEMUXER_TYPE_PVA) ||
  60     (fmt == DEMUXER_TYPE_MPEG_ES) ||
  61     (fmt == DEMUXER_TYPE_MPEG_GXF) ||
  62     (fmt == DEMUXER_TYPE_MPEG_PES) ||
  63     (
  64       (fmt == DEMUXER_TYPE_MPEG_PS || fmt == DEMUXER_TYPE_MPEG_TS) &&
  65       ((! sh_video->format) || (sh_video->format==0x10000001) || (sh_video->format==0x10000002))
  66     ) ||
  67     (fmt == DEMUXER_TYPE_MPEG_TY)
  68 #ifdef STREAMING_LIVE555
  69     || ((fmt == DEMUXER_TYPE_RTP) && demux_is_mpeg_rtp_stream(d_video->demuxer))
  70 #endif
  71   )
  72     return VIDEO_MPEG12;
  73   else if((fmt == DEMUXER_TYPE_MPEG4_ES) ||
  74     ((fmt == DEMUXER_TYPE_MPEG_TS) && (sh_video->format==0x10000004)) ||
  75     ((fmt == DEMUXER_TYPE_MPEG_PS) && (sh_video->format==0x10000004))
  76   )
  77     return VIDEO_MPEG4;
  78   else if((fmt == DEMUXER_TYPE_H264_ES) ||
  79     ((fmt == DEMUXER_TYPE_MPEG_TS) && (sh_video->format==0x10000005)) ||
  80     ((fmt == DEMUXER_TYPE_MPEG_PS) && (sh_video->format==0x10000005))
  81   )
  82     return VIDEO_H264;
  83   else if((fmt == DEMUXER_TYPE_MPEG_PS ||  fmt == DEMUXER_TYPE_MPEG_TS) &&
  84     (sh_video->format==mmioFOURCC('W', 'V', 'C', '1')))
  85     return VIDEO_VC1;
  86   else
  87     return VIDEO_OTHER;
  88 }
  89
  90 int video_read_properties(sh_video_t *sh_video){
  91 demux_stream_t *d_video=sh_video->ds;
  92 video_codec_t video_codec = find_video_codec(sh_video);
  93 // Determine image properties:
  94 switch(video_codec){
  95  case VIDEO_OTHER: {
  96  if((d_video->demuxer->file_format == DEMUXER_TYPE_ASF) || (d_video->demuxer->file_format == DEMUXER_TYPE_AVI)) {
  97     // display info:
  98     // in case no strf chunk has been seen in avi, we have no bitmap header
  99     if(!sh_video->bih) return 0;
 100     sh_video->format=sh_video->bih->biCompression;
 101     sh_video->disp_w=sh_video->bih->biWidth;
 102     sh_video->disp_h=abs(sh_video->bih->biHeight);
 103   }
 104   break;
 105  }
 106  case VIDEO_MPEG4: {
 107    int pos = 0, vop_cnt=0, units[3];
 108    videobuf_len=0; videobuf_code_len=0;
 109    mp_msg(MSGT_DECVIDEO,MSGL_V,"Searching for Video Object Start code... ");
 110    while(1){
 111       int i=sync_video_packet(d_video);
 112       if(i<=0x11F) break; // found it!
 113       if(!i || !skip_video_packet(d_video)){
 114         mp_msg(MSGT_DECVIDEO,MSGL_V,"NONE :(\n");
 115         return 0;
 116       }
 117    }
 118    mp_msg(MSGT_DECVIDEO,MSGL_V,"OK!\n");
 119    if(!videobuffer) {
 120      videobuffer=(char*)memalign(8,VIDEOBUFFER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
 121      if (videobuffer) memset(videobuffer+VIDEOBUFFER_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
 122      else {
 123        mp_msg(MSGT_DECVIDEO,MSGL_ERR,MSGTR_ShMemAllocFail);
 124        return 0;
 125      }
 126    }
 127    mp_msg(MSGT_DECVIDEO,MSGL_V,"Searching for Video Object Layer Start code... ");
 128    while(1){
 129       int i=sync_video_packet(d_video);
 130       mp_msg(MSGT_DECVIDEO,MSGL_V,"M4V: 0x%X\n",i);
 131       if(i>=0x120 && i<=0x12F) break; // found it!
 132       if(!i || !read_video_packet(d_video)){
 133         mp_msg(MSGT_DECVIDEO,MSGL_V,"NONE :(\n");
 134         return 0;
 135       }
 136    }
 137    pos = videobuf_len+4;
 138    if(!read_video_packet(d_video)){
 139      mp_msg(MSGT_DECVIDEO,MSGL_ERR,"Can't read Video Object Layer Header\n");
 140      return 0;
 141    }
 142    mp4_header_process_vol(&picture, &(videobuffer[pos]));
 143    mp_msg(MSGT_DECVIDEO,MSGL_V,"OK! FPS SEEMS TO BE %.3f\nSearching for Video Object Plane Start code... ", sh_video->fps);
 144  mp4_init:
 145    while(1){
 146       int i=sync_video_packet(d_video);
 147       if(i==0x1B6) break; // found it!
 148       if(!i || !read_video_packet(d_video)){
 149         mp_msg(MSGT_DECVIDEO,MSGL_V,"NONE :(\n");
 150         return 0;
 151       }
 152    }
 153    pos = videobuf_len+4;
 154    if(!read_video_packet(d_video)){
 155      mp_msg(MSGT_DECVIDEO,MSGL_ERR,"Can't read Video Object Plane Header\n");
 156      return 0;
 157    }
 158    mp4_header_process_vop(&picture, &(videobuffer[pos]));
 159    units[vop_cnt] = picture.timeinc_unit;
 160    vop_cnt++;
 161    //mp_msg(MSGT_DECVIDEO,MSGL_V, "TYPE: %d, unit: %d\n", picture.picture_type, picture.timeinc_unit);
 162    if(!picture.fps) {
 163      int i, mn, md, mx, diff;
 164      if(vop_cnt < 3)
 165           goto mp4_init;
 166
 167      i=0;
 168      mn = mx = units[0];
 169      for(i=0; i<3; i++) {
 170        if(units[i] < mn)
 171          mn = units[i];
 172        if(units[i] > mx)
 173          mx = units[i];
 174      }
 175      md = mn;
 176      for(i=0; i<3; i++) {
 177        if((units[i] > mn) && (units[i] < mx))
 178          md = units[i];
 179      }
 180      mp_msg(MSGT_DECVIDEO,MSGL_V, "MIN: %d, mid: %d, max: %d\n", mn, md, mx);
 181      if(mx - md > md - mn)
 182        diff = md - mn;
 183      else
 184        diff = mx - md;
 185      if(diff > 0){
 186        picture.fps = ((float)picture.timeinc_resolution) / diff;
 187        mp_msg(MSGT_DECVIDEO,MSGL_V, "FPS seems to be: %f, resolution: %d, delta_units: %d\n", picture.fps, picture.timeinc_resolution, diff);
 188      }
 189    }
 190    if(picture.fps) {
 191     sh_video->fps=picture.fps;
 192     sh_video->frametime=1.0/picture.fps;
 193     mp_msg(MSGT_DECVIDEO,MSGL_INFO, "FPS seems to be: %f\n", picture.fps);
 194    }
 195    mp_msg(MSGT_DECVIDEO,MSGL_V,"OK!\n");
 196    sh_video->format=0x10000004;
 197    break;
 198  }
 199  case VIDEO_H264: {
 200    int pos = 0;
 201    videobuf_len=0; videobuf_code_len=0;
 202    mp_msg(MSGT_DECVIDEO,MSGL_V,"Searching for sequence parameter set... ");
 203    while(1){
 204       int i=sync_video_packet(d_video);
 205       if((i&~0x60) == 0x107 && i != 0x107) break; // found it!
 206       if(!i || !skip_video_packet(d_video)){
 207         mp_msg(MSGT_DECVIDEO,MSGL_V,"NONE :(\n");
 208         return 0;
 209       }
 210    }
 211    mp_msg(MSGT_DECVIDEO,MSGL_V,"OK!\n");
 212    if(!videobuffer) {
 213      videobuffer=(char*)memalign(8,VIDEOBUFFER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
 214      if (videobuffer) memset(videobuffer+VIDEOBUFFER_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
 215      else {
 216        mp_msg(MSGT_DECVIDEO,MSGL_ERR,MSGTR_ShMemAllocFail);
 217        return 0;
 218      }
 219    }
 220    pos = videobuf_len+4;
 221    if(!read_video_packet(d_video)){
 222      mp_msg(MSGT_DECVIDEO,MSGL_ERR,"Can't read sequence parameter set\n");
 223      return 0;
 224    }
 225    h264_parse_sps(&picture, &(videobuffer[pos]), videobuf_len - pos);
 226    mp_msg(MSGT_DECVIDEO,MSGL_V,"Searching for picture parameter set... ");
 227    while(1){
 228       int i=sync_video_packet(d_video);
 229       mp_msg(MSGT_DECVIDEO,MSGL_V,"H264: 0x%X\n",i);
 230       if((i&~0x60) == 0x108 && i != 0x108) break; // found it!
 231       if(!i || !read_video_packet(d_video)){
 232         mp_msg(MSGT_DECVIDEO,MSGL_V,"NONE :(\n");
 233         return 0;
 234       }
 235    }
 236    mp_msg(MSGT_DECVIDEO,MSGL_V,"OK!\nSearching for Slice... ");
 237    while(1){
 238       int i=sync_video_packet(d_video);
 239       if((i&~0x60) == 0x101 || (i&~0x60) == 0x102 || (i&~0x60) == 0x105) break; // found it!
 240       if(!i || !read_video_packet(d_video)){
 241         mp_msg(MSGT_DECVIDEO,MSGL_V,"NONE :(\n");
 242         return 0;
 243       }
 244    }
 245    mp_msg(MSGT_DECVIDEO,MSGL_V,"OK!\n");
 246    sh_video->format=0x10000005;
 247    if(picture.fps) {
 248      sh_video->fps=picture.fps;
 249      sh_video->frametime=1.0/picture.fps;
 250      mp_msg(MSGT_DECVIDEO,MSGL_INFO, "FPS seems to be: %f\n", picture.fps);
 251    }
 252    break;
 253  }
 254  case VIDEO_MPEG12: {
 255 mpeg_header_parser:
 256    // Find sequence_header first:
 257    videobuf_len=0; videobuf_code_len=0;
 258    telecine=0; telecine_cnt=-2.5;
 259    mp_msg(MSGT_DECVIDEO,MSGL_V,"Searching for sequence header... ");
 260    while(1){
 261       int i=sync_video_packet(d_video);
 262       if(i==0x1B3) break; // found it!
 263       if(!i || !skip_video_packet(d_video)){
 264         if( mp_msg_test(MSGT_DECVIDEO,MSGL_V) )  mp_msg(MSGT_DECVIDEO,MSGL_V,"NONE :(\n");
 265         mp_msg(MSGT_DECVIDEO,MSGL_ERR,MSGTR_MpegNoSequHdr);
 266         return 0;
 267       }
 268    }
 269    mp_msg(MSGT_DECVIDEO,MSGL_V,"OK!\n");
 270    // ========= Read & process sequence header & extension ============
 271    if(!videobuffer) {
 272      videobuffer=(char*)memalign(8,VIDEOBUFFER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
 273      if (videobuffer) memset(videobuffer+VIDEOBUFFER_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
 274      else {
 275        mp_msg(MSGT_DECVIDEO,MSGL_ERR,MSGTR_ShMemAllocFail);
 276        return 0;
 277      }
 278    }
 279
 280    if(!read_video_packet(d_video)){
 281      mp_msg(MSGT_DECVIDEO,MSGL_ERR,MSGTR_CannotReadMpegSequHdr);
 282      return 0;
 283    }
 284    if(mp_header_process_sequence_header (&picture, &videobuffer[4])) {
 285      mp_msg(MSGT_DECVIDEO,MSGL_ERR,MSGTR_BadMpegSequHdr);
 286      goto mpeg_header_parser;
 287    }
 288    if(sync_video_packet(d_video)==0x1B5){ // next packet is seq. ext.
 289     int pos=videobuf_len;
 290     if(!read_video_packet(d_video)){
 291       mp_msg(MSGT_DECVIDEO,MSGL_ERR,MSGTR_CannotReadMpegSequHdrEx);
 292       return 0;
 293     }
 294     if(mp_header_process_extension (&picture, &videobuffer[pos+4])) {
 295       mp_msg(MSGT_DECVIDEO,MSGL_ERR,MSGTR_BadMpegSequHdrEx);
 296       return 0;
 297     }
 298    }
 299
 300    // display info:
 301    sh_video->format=picture.mpeg1?0x10000001:0x10000002; // mpeg video
 302    sh_video->fps=picture.fps;
 303    if(!sh_video->fps){
 304      sh_video->frametime=0;
 305    } else {
 306      sh_video->frametime=1.0/picture.fps;
 307    }
 308    sh_video->disp_w=picture.display_picture_width;
 309    sh_video->disp_h=picture.display_picture_height;
 310    // bitrate:
 311    if(picture.bitrate!=0x3FFFF) // unspecified/VBR ?
 312        sh_video->i_bps=picture.bitrate * 400 / 8;
 313    // info:
 314    mp_dbg(MSGT_DECVIDEO,MSGL_DBG2,"mpeg bitrate: %d (%X)\n",picture.bitrate,picture.bitrate);
 315    mp_msg(MSGT_DECVIDEO,MSGL_INFO,"VIDEO:  %s  %dx%d  (aspect %d)  %5.3f fps  %5.1f kbps (%4.1f kbyte/s)\n",
 316     picture.mpeg1?"MPEG1":"MPEG2",
 317     sh_video->disp_w,sh_video->disp_h,
 318     picture.aspect_ratio_information,
 319     sh_video->fps,
 320     sh_video->i_bps * 8 / 1000.0,
 321     sh_video->i_bps / 1000.0 );
 322   break;
 323  }
 324  case VIDEO_VC1: {
 325    // Find sequence_header:
 326    videobuf_len=0;
 327    videobuf_code_len=0;
 328    mp_msg(MSGT_DECVIDEO,MSGL_INFO,"Searching for VC1 sequence header... ");
 329    while(1){
 330       int i=sync_video_packet(d_video);
 331       if(i==0x10F) break; // found it!
 332       if(!i || !skip_video_packet(d_video)){
 333         if( mp_msg_test(MSGT_DECVIDEO,MSGL_V) )  mp_msg(MSGT_DECVIDEO,MSGL_V,"NONE :(\n");
 334         mp_msg(MSGT_DECVIDEO,MSGL_ERR, "Couldn't find VC-1 sequence header\n");
 335         return 0;
 336       }
 337    }
 338    mp_msg(MSGT_DECVIDEO,MSGL_INFO,"found\n");
 339    if(!videobuffer) {
 340      videobuffer=(char*)memalign(8,VIDEOBUFFER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
 341      if (videobuffer) memset(videobuffer+VIDEOBUFFER_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
 342      else {
 343        mp_msg(MSGT_DECVIDEO,MSGL_ERR,MSGTR_ShMemAllocFail);
 344        return 0;
 345      }
 346    }
 347    if(!read_video_packet(d_video)){
 348      mp_msg(MSGT_DECVIDEO,MSGL_ERR, "Couldn't read VC-1 sequence header!\n");
 349      return 0;
 350    }
 351
 352    while(1) {
 353       int i=sync_video_packet(d_video);
 354       if(i==0x10E) break; // found it!
 355       if(!i || !skip_video_packet(d_video)){
 356         mp_msg(MSGT_DECVIDEO,MSGL_V,"Couldn't find VC-1 entry point sync-code:(\n");
 357         return 0;
 358       }
 359    }
 360    if(!read_video_packet(d_video)){
 361       mp_msg(MSGT_DECVIDEO,MSGL_V,"Couldn't read VC-1 entry point sync-code:(\n");
 362       return 0;
 363    }
 364
 365    if(mp_vc1_decode_sequence_header(&picture, &videobuffer[4], videobuf_len-4)) {
 366      sh_video->bih = (BITMAPINFOHEADER *) calloc(1, sizeof(BITMAPINFOHEADER) + videobuf_len);
 367      if(sh_video->bih == NULL) {
 368        mp_msg(MSGT_DECVIDEO,MSGL_ERR,"Couldn't alloc %d bytes for VC-1 extradata!\n", sizeof(BITMAPINFOHEADER) + videobuf_len);
 369        return 0;
 370      }
 371      sh_video->bih->biSize= sizeof(BITMAPINFOHEADER) + videobuf_len;
 372      memcpy(sh_video->bih + 1, videobuffer, videobuf_len);
 373      sh_video->bih->biCompression = sh_video->format;
 374      sh_video->bih->biWidth = sh_video->disp_w = picture.display_picture_width;
 375      sh_video->bih->biHeight = sh_video->disp_h = picture.display_picture_height;
 376      if(picture.fps > 0) {
 377        sh_video->frametime=1.0/picture.fps;
 378        sh_video->fps = picture.fps;
 379      }
 380      mp_msg(MSGT_DECVIDEO,MSGL_INFO,"VIDEO:  VC-1  %dx%d, %5.3f fps, header len: %d\n",
 381        sh_video->disp_w, sh_video->disp_h, sh_video->fps, videobuf_len);
 382    }
 383   break;
 384  }
 385 } // switch(file_format)
 386
 387 return 1;
 388 }
 389
 390 void ty_processuserdata( unsigned char* buf, int len );
 391
 392 static void process_userdata(unsigned char* buf,int len){
 393     int i;
 394     /* if the user data starts with "CC", assume it is a CC info packet */
 395     if(len>2 && buf[0]=='C' && buf[1]=='C'){
 396 //    mp_msg(MSGT_DECVIDEO,MSGL_DBG2,"video.c: process_userdata() detected Closed Captions!\n");
 397       subcc_process_data(buf+2,len-2);
 398     }
 399     if( len > 2 && buf[ 0 ] == 'T' && buf[ 1 ] == 'Y' )
 400     {
 401        ty_processuserdata( buf + 2, len - 2 );
 402        return;
 403     }
 404     if(verbose<2) return;
 405     fprintf(stderr, "user_data: len=%3d  %02X %02X %02X %02X '",
 406       len, buf[0], buf[1], buf[2], buf[3]);
 407     for(i=0;i<len;i++)
 408 //    if(buf[i]>=32 && buf[i]<127) fputc(buf[i], stderr);
 409       if(buf[i]&0x60) fputc(buf[i]&0x7F, stderr);
 410     fprintf(stderr, "'\n");
 411 }
 412
 413 int video_read_frame(sh_video_t* sh_video,float* frame_time_ptr,unsigned char** start,int force_fps){
 414     demux_stream_t *d_video=sh_video->ds;
 415     demuxer_t *demuxer=d_video->demuxer;
 416     float frame_time=1;
 417     float pts1=d_video->pts;
 418     float pts=0;
 419     int picture_coding_type=0;
 420     int in_size=0;
 421     video_codec_t video_codec = find_video_codec(sh_video);
 422
 423     *start=NULL;
 424
 425   if(video_codec == VIDEO_MPEG12){
 426         int in_frame=0;
 427         //float newfps;
 428         //videobuf_len=0;
 429         while(videobuf_len<VIDEOBUFFER_SIZE-MAX_VIDEO_PACKET_SIZE){
 430           int i=sync_video_packet(d_video);
 431           //void* buffer=&videobuffer[videobuf_len+4];
 432           int start=videobuf_len+4;
 433           if(in_frame){
 434             if(i<0x101 || i>=0x1B0){  // not slice code -> end of frame
 435               if(!i) return -1; // EOF
 436               break;
 437             }
 438           } else {
 439             if(i==0x100){
 440               pts=d_video->pts;
 441               d_video->pts=0;
 442             }
 443             if(i>=0x101 && i<0x1B0) in_frame=1; // picture startcode
 444             else if(!i) return -1; // EOF
 445           }
 446           if(!read_video_packet(d_video)) return -1; // EOF
 447           // process headers:
 448           switch(i){
 449             case 0x1B3: mp_header_process_sequence_header (&picture, &videobuffer[start]);break;
 450             case 0x1B5: mp_header_process_extension (&picture, &videobuffer[start]);break;
 451             case 0x1B2: process_userdata (&videobuffer[start], videobuf_len-start);break;
 452             case 0x100: picture_coding_type=(videobuffer[start+1] >> 3) & 7;break;
 453           }
 454         }
 455
 456         *start=videobuffer; in_size=videobuf_len;
 457
 458     // get mpeg fps:
 459     if(sh_video->fps!=picture.fps) if(!force_fps && !telecine){
 460             mp_msg(MSGT_CPLAYER,MSGL_WARN,"Warning! FPS changed %5.3f -> %5.3f  (%f) [%d]  \n",sh_video->fps,picture.fps,sh_video->fps-picture.fps,picture.frame_rate_code);
 461             sh_video->fps=picture.fps;
 462             sh_video->frametime=1.0/picture.fps;
 463     }
 464
 465     // fix mpeg2 frametime:
 466     frame_time=(picture.display_time)*0.01f;
 467     picture.display_time=100;
 468     videobuf_len=0;
 469
 470     telecine_cnt*=0.9; // drift out error
 471     telecine_cnt+=frame_time-5.0/4.0;
 472     mp_msg(MSGT_DECVIDEO,MSGL_DBG2,"\r telecine = %3.1f  %5.3f     \n",frame_time,telecine_cnt);
 473
 474     if(telecine){
 475         frame_time=1;
 476         if(telecine_cnt<-1.5 || telecine_cnt>1.5){
 477             mp_msg(MSGT_DECVIDEO,MSGL_INFO,MSGTR_LeaveTelecineMode);
 478             telecine=0;
 479         }
 480     } else
 481         if(telecine_cnt>-0.5 && telecine_cnt<0.5 && !force_fps){
 482             sh_video->fps=sh_video->fps*4/5;
 483             sh_video->frametime=sh_video->frametime*5/4;
 484             mp_msg(MSGT_DECVIDEO,MSGL_INFO,MSGTR_EnterTelecineMode);
 485             telecine=1;
 486         }
 487   } else if(video_codec == VIDEO_MPEG4){
 488         while(videobuf_len<VIDEOBUFFER_SIZE-MAX_VIDEO_PACKET_SIZE){
 489           int i=sync_video_packet(d_video);
 490           if(!i) return -1;
 491           if(!read_video_packet(d_video)) return -1; // EOF
 492           if(i==0x1B6) break;
 493         }
 494         *start=videobuffer; in_size=videobuf_len;
 495         videobuf_len=0;
 496   } else if(video_codec == VIDEO_H264){
 497         int in_picture = 0;
 498         while(videobuf_len<VIDEOBUFFER_SIZE-MAX_VIDEO_PACKET_SIZE){
 499           int i=sync_video_packet(d_video);
 500           int pos = videobuf_len+4;
 501           if(!i) return -1;
 502           if(!read_video_packet(d_video)) return -1; // EOF
 503           if((i&~0x60) == 0x107 && i != 0x107) {
 504             h264_parse_sps(&picture, &(videobuffer[pos]), videobuf_len - pos);
 505             if(picture.fps > 0) {
 506               sh_video->fps=picture.fps;
 507               sh_video->frametime=1.0/picture.fps;
 508             }
 509             i=sync_video_packet(d_video);
 510             if(!i) return -1;
 511             if(!read_video_packet(d_video)) return -1; // EOF
 512           }
 513
 514           // here starts the access unit end detection code
 515           // see the mail on MPlayer-dev-eng for details:
 516           // Date: Sat, 17 Sep 2005 11:24:06 +0200
 517           // Subject: Re: [MPlayer-dev-eng] [RFC] h264 ES parser problems
 518           // Message-ID: <20050917092406.GA7699@rz.uni-karlsruhe.de>
 519           if((i&~0x60) == 0x101 || (i&~0x60) == 0x102 || (i&~0x60) == 0x105)
 520             // found VCL NAL with slice header i.e. start of current primary coded
 521             // picture, so start scanning for the end now
 522             in_picture = 1;
 523           if (in_picture) {
 524             i = sync_video_packet(d_video) & ~0x60; // code of next packet
 525             if(i == 0x106 || i == 0x109) break; // SEI or access unit delim.
 526             if(i == 0x101 || i == 0x102 || i == 0x105) {
 527               // assuming arbitrary slice ordering is not allowed, the
 528               // first_mb_in_slice (golomb encoded) value should be 0 then
 529               // for the first VCL NAL in a picture
 530               if (demux_peekc(d_video) & 0x80)
 531                 break;
 532             }
 533           }
 534         }
 535         *start=videobuffer; in_size=videobuf_len;
 536         videobuf_len=0;
 537   }  else if(video_codec == VIDEO_VC1) {
 538        while(videobuf_len<VIDEOBUFFER_SIZE-MAX_VIDEO_PACKET_SIZE) {
 539          int i=sync_video_packet(d_video);
 540          if(!i) return -1;
 541          if(!read_video_packet(d_video)) return -1; // EOF
 542          if(i==0x10D) break;
 543        }
 544        *start=videobuffer;
 545        in_size=videobuf_len;
 546        videobuf_len=0;
 547   } else {
 548       // frame-based file formats: (AVI,ASF,MOV)
 549     in_size=ds_get_packet(d_video,start);
 550     if(in_size<0) return -1; // EOF
 551   }
 552
 553
 554 //------------------------ frame decoded. --------------------
 555
 556     // Increase video timers:
 557     sh_video->num_frames+=frame_time;
 558     ++sh_video->num_frames_decoded;
 559
 560     frame_time*=sh_video->frametime;
 561
 562     // override frame_time for variable/unknown FPS formats:
 563     if(!force_fps) switch(demuxer->file_format){
 564       case DEMUXER_TYPE_GIF:
 565       case DEMUXER_TYPE_MATROSKA:
 566        if(d_video->pts>0 && pts1>0 && d_video->pts>pts1)
 567          frame_time=d_video->pts-pts1;
 568         break;
 569       case DEMUXER_TYPE_TV:
 570       case DEMUXER_TYPE_MOV:
 571       case DEMUXER_TYPE_FILM:
 572       case DEMUXER_TYPE_VIVO:
 573       case DEMUXER_TYPE_OGG:
 574       case DEMUXER_TYPE_ASF: {
 575         double next_pts = ds_get_next_pts(d_video);
 576         double d= (next_pts != MP_NOPTS_VALUE) ? next_pts - d_video->pts : d_video->pts-pts1;
 577         if(d>=0){
 578           if(d>0){
 579             if((int)sh_video->fps==1000)
 580               mp_msg(MSGT_CPLAYER,MSGL_V,"\navg. framerate: %d fps             \n",(int)(1.0f/d));
 581             sh_video->frametime=d; // 1ms
 582             sh_video->fps=1.0f/d;
 583           }
 584           frame_time = d;
 585         } else {
 586           mp_msg(MSGT_CPLAYER,MSGL_WARN,"\nInvalid frame duration value (%5.3f/%5.3f => %5.3f). Defaulting to %5.3f sec.\n",d_video->pts,next_pts,d,frame_time);
 587           // frame_time = 1/25.0;
 588         }
 589       }
 590       break;
 591       case DEMUXER_TYPE_LAVF:
 592         if((int)sh_video->fps==1000 || (int)sh_video->fps<=1){
 593           double next_pts = ds_get_next_pts(d_video);
 594           double d= (next_pts != MP_NOPTS_VALUE) ? next_pts - d_video->pts : d_video->pts-pts1;
 595           if(d>=0){
 596             frame_time = d;
 597           }
 598         }
 599       break;
 600       case DEMUXER_TYPE_REAL:
 601         {
 602           double next_pts = ds_get_next_pts(d_video);
 603           double d = (next_pts != MP_NOPTS_VALUE) ? next_pts - d_video->pts : d_video->pts - pts1;
 604
 605           frame_time = (d >= 0 && pts1 > 0) ? d : 0.001;
 606         }
 607       break;
 608     }
 609
 610     if(video_codec == VIDEO_MPEG12){
 611         sh_video->pts+=frame_time;
 612         if(picture_coding_type==1)
 613             d_video->flags |= 1;
 614         if(picture_coding_type<=2 && sh_video->i_pts){
 615             sh_video->pts=sh_video->i_pts;
 616             sh_video->i_pts=pts;
 617         } else {
 618             if(pts){
 619                 if(picture_coding_type<=2) sh_video->i_pts=pts;
 620                 else sh_video->pts=pts;
 621             }
 622         }
 623     } else
 624         sh_video->pts=d_video->pts;
 625
 626     if(frame_time_ptr) *frame_time_ptr=frame_time;
 627     return in_size;
 628 }
 629