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  1. /*
  2.  * RAW Chinese AVS video demuxer
  3.  * Copyright (c) 2009  Stefan Gehrer <stefan.gehrer@gmx.de>
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include "avformat.h"
  23. #include "rawdec.h"
  24.  
  25. #define CAVS_SEQ_START_CODE       0x000001b0
  26. #define CAVS_PIC_I_START_CODE     0x000001b3
  27. #define CAVS_UNDEF_START_CODE     0x000001b4
  28. #define CAVS_PIC_PB_START_CODE    0x000001b6
  29. #define CAVS_VIDEO_EDIT_CODE      0x000001b7
  30. #define CAVS_PROFILE_JIZHUN       0x20
  31.  
  32. static int cavsvideo_probe(AVProbeData *p)
  33. {
  34.     uint32_t code= -1;
  35.     int pic=0, seq=0, slice_pos = 0;
  36.     int i;
  37.  
  38.     for(i=0; i<p->buf_size; i++){
  39.         code = (code<<8) + p->buf[i];
  40.         if ((code & 0xffffff00) == 0x100) {
  41.             if(code < CAVS_SEQ_START_CODE) {
  42.                 /* slices have to be consecutive */
  43.                 if(code < slice_pos)
  44.                     return 0;
  45.                 slice_pos = code;
  46.             } else {
  47.                 slice_pos = 0;
  48.             }
  49.             if (code == CAVS_SEQ_START_CODE) {
  50.                 seq++;
  51.                 /* check for the only currently supported profile */
  52.                 if(p->buf[i+1] != CAVS_PROFILE_JIZHUN)
  53.                     return 0;
  54.             } else if ((code == CAVS_PIC_I_START_CODE) ||
  55.                        (code == CAVS_PIC_PB_START_CODE)) {
  56.                 pic++;
  57.             } else if ((code == CAVS_UNDEF_START_CODE) ||
  58.                        (code >  CAVS_VIDEO_EDIT_CODE)) {
  59.                 return 0;
  60.             }
  61.         }
  62.     }
  63.     if(seq && seq*9<=pic*10)
  64.         return AVPROBE_SCORE_EXTENSION;
  65.     return 0;
  66. }
  67.  
  68. FF_DEF_RAWVIDEO_DEMUXER(cavsvideo, "raw Chinese AVS (Audio Video Standard)", cavsvideo_probe, NULL, AV_CODEC_ID_CAVS)
  69.