Subversion Repositories Kolibri OS

Rev

Blame | Last modification | View Log | RSS feed

  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. #include "libavcodec/internal.h"
  25.  
  26. #define CAVS_SEQ_START_CODE       0x000001b0
  27. #define CAVS_PIC_I_START_CODE     0x000001b3
  28. #define CAVS_UNDEF_START_CODE     0x000001b4
  29. #define CAVS_PIC_PB_START_CODE    0x000001b6
  30. #define CAVS_VIDEO_EDIT_CODE      0x000001b7
  31. #define CAVS_PROFILE_JIZHUN       0x20
  32.  
  33. static int cavsvideo_probe(AVProbeData *p)
  34. {
  35.     uint32_t code= -1;
  36.     int pic=0, seq=0, slice_pos = 0;
  37.     const uint8_t *ptr = p->buf, *end = p->buf + p->buf_size;
  38.  
  39.     while (ptr < end) {
  40.         ptr = avpriv_find_start_code(ptr, end, &code);
  41.         if ((code & 0xffffff00) == 0x100) {
  42.             if(code < CAVS_SEQ_START_CODE) {
  43.                 /* slices have to be consecutive */
  44.                 if(code < slice_pos)
  45.                     return 0;
  46.                 slice_pos = code;
  47.             } else {
  48.                 slice_pos = 0;
  49.             }
  50.             if (code == CAVS_SEQ_START_CODE) {
  51.                 seq++;
  52.                 /* check for the only currently supported profile */
  53.                 if (*ptr != CAVS_PROFILE_JIZHUN)
  54.                     return 0;
  55.             } else if ((code == CAVS_PIC_I_START_CODE) ||
  56.                        (code == CAVS_PIC_PB_START_CODE)) {
  57.                 pic++;
  58.             } else if ((code == CAVS_UNDEF_START_CODE) ||
  59.                        (code >  CAVS_VIDEO_EDIT_CODE)) {
  60.                 return 0;
  61.             }
  62.         }
  63.     }
  64.     if(seq && seq*9<=pic*10)
  65.         return AVPROBE_SCORE_EXTENSION+1;
  66.     return 0;
  67. }
  68.  
  69. FF_DEF_RAWVIDEO_DEMUXER(cavsvideo, "raw Chinese AVS (Audio Video Standard)", cavsvideo_probe, NULL, AV_CODEC_ID_CAVS)
  70.