mirror of
https://github.com/FFmpeg/FFmpeg.git
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69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
/*
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* RAW Chinese AVS video demuxer
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* Copyright (c) 2009 Stefan Gehrer <stefan.gehrer@gmx.de>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "rawdec.h"
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#define CAVS_SEQ_START_CODE 0x000001b0
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#define CAVS_PIC_I_START_CODE 0x000001b3
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#define CAVS_UNDEF_START_CODE 0x000001b4
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#define CAVS_PIC_PB_START_CODE 0x000001b6
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#define CAVS_VIDEO_EDIT_CODE 0x000001b7
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#define CAVS_PROFILE_JIZHUN 0x20
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static int cavsvideo_probe(AVProbeData *p)
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{
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uint32_t code= -1;
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int pic=0, seq=0, slice_pos = 0;
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int i;
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for(i=0; i<p->buf_size; i++){
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code = (code<<8) + p->buf[i];
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if ((code & 0xffffff00) == 0x100) {
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if(code < CAVS_SEQ_START_CODE) {
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/* slices have to be consecutive */
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if(code < slice_pos)
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return 0;
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slice_pos = code;
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} else {
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slice_pos = 0;
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}
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if (code == CAVS_SEQ_START_CODE) {
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seq++;
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/* check for the only currently supported profile */
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if(p->buf[i+1] != CAVS_PROFILE_JIZHUN)
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return 0;
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} else if ((code == CAVS_PIC_I_START_CODE) ||
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(code == CAVS_PIC_PB_START_CODE)) {
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pic++;
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} else if ((code == CAVS_UNDEF_START_CODE) ||
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(code > CAVS_VIDEO_EDIT_CODE)) {
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return 0;
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}
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}
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}
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if(seq && seq*9<=pic*10)
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return AVPROBE_SCORE_EXTENSION+1;
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return 0;
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}
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FF_DEF_RAWVIDEO_DEMUXER(cavsvideo, "raw Chinese AVS (Audio Video Standard)", cavsvideo_probe, NULL, AV_CODEC_ID_CAVS)
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