yading@11: /*
yading@11:  * RAW H.264 video demuxer
yading@11:  * Copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at>
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "avformat.h"
yading@11: #include "rawdec.h"
yading@11: 
yading@11: static int h264_probe(AVProbeData *p)
yading@11: {
yading@11:     uint32_t code= -1;
yading@11:     int sps=0, pps=0, idr=0, res=0, sli=0;
yading@11:     int i;
yading@11: 
yading@11:     for(i=0; i<p->buf_size; i++){
yading@11:         code = (code<<8) + p->buf[i];
yading@11:         if ((code & 0xffffff00) == 0x100) {
yading@11:             int ref_idc= (code>>5)&3;
yading@11:             int type   = code & 0x1F;
yading@11:             static const int8_t ref_zero[32]={
yading@11:                 2, 0, 0, 0, 0,-1, 1,-1,
yading@11:                -1, 1, 1, 1, 1,-1, 2, 2,
yading@11:                 2, 2, 2, 0, 2, 2, 2, 2,
yading@11:                 2, 2, 2, 2, 2, 2, 2, 2
yading@11:             };
yading@11: 
yading@11:             if(code & 0x80) //forbidden bit
yading@11:                 return 0;
yading@11: 
yading@11:             if(ref_zero[type] == 1 && ref_idc)
yading@11:                 return 0;
yading@11:             if(ref_zero[type] ==-1 && !ref_idc)
yading@11:                 return 0;
yading@11:             if(ref_zero[type] == 2)
yading@11:                 res++;
yading@11: 
yading@11:             switch(type){
yading@11:             case     1:   sli++; break;
yading@11:             case     5:   idr++; break;
yading@11:             case     7:
yading@11:                 if (p->buf[i + 2] & 0x03)
yading@11:                     return 0;
yading@11:                 sps++;
yading@11:                 break;
yading@11:             case     8:   pps++; break;
yading@11:             }
yading@11:         }
yading@11:     }
yading@11:     if(sps && pps && (idr||sli>3) && res<(sps+pps+idr))
yading@11:         return AVPROBE_SCORE_MAX/2+1; // +1 for .mpg
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: FF_DEF_RAWVIDEO_DEMUXER(h264 , "raw H.264 video", h264_probe, "h26l,h264,264", AV_CODEC_ID_H264)