| /* |
| * 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_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) |
