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- /*
- * RAW H.264 video demuxer
- * Copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at>
- *
- * This file is part of Libav.
- *
- * Libav is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * Libav is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with Libav; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
- #include "avformat.h"
- #include "rawdec.h"
-
- static int h264_probe(AVProbeData *p)
- {
- uint32_t code= -1;
- int sps=0, pps=0, idr=0, res=0, sli=0;
- int i;
-
- for(i=0; i<p->buf_size; i++){
- code = (code<<8) + p->buf[i];
- if ((code & 0xffffff00) == 0x100) {
- int ref_idc= (code>>5)&3;
- int type = code & 0x1F;
- static const int8_t ref_zero[32]={
- 2, 0, 0, 0, 0,-1, 1,-1,
- -1, 1, 1, 1, 1,-1, 2, 2,
- 2, 2, 2, 0, 2, 2, 2, 2,
- 2, 2, 2, 2, 2, 2, 2, 2
- };
-
- if(code & 0x80) //forbidden bit
- return 0;
-
- if(ref_zero[type] == 1 && ref_idc)
- return 0;
- if(ref_zero[type] ==-1 && !ref_idc)
- return 0;
- if(ref_zero[type] == 2)
- res++;
-
- switch(type){
- case 1: sli++; break;
- case 5: idr++; break;
- case 7:
- if(p->buf[i+2]&0x0F)
- return 0;
- sps++;
- break;
- case 8: pps++; break;
- }
- }
- }
- if(sps && pps && (idr||sli>3) && res<(sps+pps+idr))
- return AVPROBE_SCORE_MAX/2+1; // +1 for .mpg
- return 0;
- }
-
- FF_DEF_RAWVIDEO_DEMUXER(h264 , "raw H.264 video format", h264_probe, "h26l,h264,264", CODEC_ID_H264)
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