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 32static 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+1; 65 return 0; 66} 67 68FF_DEF_RAWVIDEO_DEMUXER(cavsvideo, "raw Chinese AVS (Audio Video Standard)", cavsvideo_probe, NULL, AV_CODEC_ID_CAVS) 69