00001 /* 00002 * RAW Chinese AVS video demuxer 00003 * Copyright (c) 2009 Stefan Gehrer <stefan.gehrer@gmx.de> 00004 * 00005 * This file is part of FFmpeg. 00006 * 00007 * FFmpeg is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * FFmpeg is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with FFmpeg; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00022 #include "avformat.h" 00023 #include "rawdec.h" 00024 00025 #define CAVS_SEQ_START_CODE 0x000001b0 00026 #define CAVS_PIC_I_START_CODE 0x000001b3 00027 #define CAVS_UNDEF_START_CODE 0x000001b4 00028 #define CAVS_PIC_PB_START_CODE 0x000001b6 00029 #define CAVS_VIDEO_EDIT_CODE 0x000001b7 00030 #define CAVS_PROFILE_JIZHUN 0x20 00031 00032 static int cavsvideo_probe(AVProbeData *p) 00033 { 00034 uint32_t code= -1; 00035 int pic=0, seq=0, slice_pos = 0; 00036 int i; 00037 00038 for(i=0; i<p->buf_size; i++){ 00039 code = (code<<8) + p->buf[i]; 00040 if ((code & 0xffffff00) == 0x100) { 00041 if(code < CAVS_SEQ_START_CODE) { 00042 /* slices have to be consecutive */ 00043 if(code < slice_pos) 00044 return 0; 00045 slice_pos = code; 00046 } else { 00047 slice_pos = 0; 00048 } 00049 if (code == CAVS_SEQ_START_CODE) { 00050 seq++; 00051 /* check for the only currently supported profile */ 00052 if(p->buf[i+1] != CAVS_PROFILE_JIZHUN) 00053 return 0; 00054 } else if ((code == CAVS_PIC_I_START_CODE) || 00055 (code == CAVS_PIC_PB_START_CODE)) { 00056 pic++; 00057 } else if ((code == CAVS_UNDEF_START_CODE) || 00058 (code > CAVS_VIDEO_EDIT_CODE)) { 00059 return 0; 00060 } 00061 } 00062 } 00063 if(seq && seq*9<=pic*10) 00064 return AVPROBE_SCORE_MAX/2; 00065 return 0; 00066 } 00067 00068 FF_DEF_RAWVIDEO_DEMUXER(cavsvideo, "raw Chinese AVS video", cavsvideo_probe, NULL, CODEC_ID_CAVS)
1.5.8