/* * RAW H.264 video demuxer * Copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at> * * This file is part of FFmpeg. * * FFmpeg 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. * * FFmpeg 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 FFmpeg; 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] & 0x03) return 0; sps++; break; case 8: pps++; break; } } } if(sps && pps && (idr||sli>3) && res<(sps+pps+idr)) return AVPROBE_SCORE_EXTENSION + 1; // 1 more than .mpg return 0; } FF_DEF_RAWVIDEO_DEMUXER(h264 , "raw H.264 video", h264_probe, "h26l,h264,264", AV_CODEC_ID_H264)