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80 lines
2.4 KiB
80 lines
2.4 KiB
/* |
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* RAW H.264 video demuxer |
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* Copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at> |
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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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static int h264_probe(AVProbeData *p) |
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{ |
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uint32_t code= -1; |
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int sps=0, pps=0, idr=0, res=0, sli=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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int ref_idc= (code>>5)&3; |
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int type = code & 0x1F; |
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static const int8_t ref_zero[32]={ |
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2, 0, 0, 0, 0,-1, 1,-1, |
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-1, 1, 1, 1, 1,-1, 2, 2, |
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2, 2, 2, 0, 2, 2, 2, 2, |
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2, 2, 2, 2, 2, 2, 2, 2 |
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}; |
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if(code & 0x80) //forbidden bit |
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return 0; |
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if(ref_zero[type] == 1 && ref_idc) |
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return 0; |
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if(ref_zero[type] ==-1 && !ref_idc) |
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return 0; |
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if(ref_zero[type] == 2) |
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res++; |
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switch(type){ |
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case 1: sli++; break; |
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case 5: idr++; break; |
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case 7: |
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if(p->buf[i+2]&0x03) |
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return 0; |
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sps++; |
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break; |
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case 8: pps++; break; |
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} |
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} |
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} |
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if(sps && pps && (idr||sli>3) && res<(sps+pps+idr)) |
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return AVPROBE_SCORE_MAX/2+1; // +1 for .mpg |
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return 0; |
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} |
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AVInputFormat ff_h264_demuxer = { |
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"h264", |
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NULL_IF_CONFIG_SMALL("raw H.264 video format"), |
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0, |
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h264_probe, |
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ff_raw_video_read_header, |
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ff_raw_read_partial_packet, |
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.flags= AVFMT_GENERIC_INDEX, |
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.extensions = "h26l,h264,264", //FIXME remove after writing mpeg4_probe |
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.value = CODEC_ID_H264, |
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};
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