8381ab1437
* qatar/master: (29 commits) ARM: disable ff_vector_fmul_vfp on VFPv3 systems ARM: check for VFPv3 swscale: Remove unused variables in x86 code. doc: Drop DJGPP section, Libav now compiles out-of-the-box on FreeDOS. x86: Add appropriate ifdefs around certain AVX functions. cmdutils: use sws_freeContext() instead of av_freep(). swscale: delay allocation of formatConvBuffer(). swscale: fix build with --disable-swscale-alpha. movenc: Deprecate the global RTP hinting flag, use a private AVOption instead movenc: Add an AVClass for setting muxer specific options swscale: fix non-bitexact yuv2yuv[X2]() MMX/MMX2 functions. configure: report yasm/nasm presence properly tcp: make connect() timeout properly rawdec: factor video demuxer definitions into a macro. rtspdec: add initial_pause private option. lavf: deprecate AVFormatParameters.width/height. tty: add video_size private option. rawdec: add video_size private option. x11grab: add video_size private option. x11grab: factorize returning error codes. ... Merged-by: Michael Niedermayer <michaelni@gmx.at>
59 lines
2.1 KiB
C
59 lines
2.1 KiB
C
/*
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* RAW MPEG video demuxer
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* Copyright (c) 2002-2003 Fabrice Bellard
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* Copyright (c) 2006 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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#define SEQ_START_CODE 0x000001b3
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#define GOP_START_CODE 0x000001b8
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#define PICTURE_START_CODE 0x00000100
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#define SLICE_START_CODE 0x00000101
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#define PACK_START_CODE 0x000001ba
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#define VIDEO_ID 0x000001e0
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#define AUDIO_ID 0x000001c0
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static int mpegvideo_probe(AVProbeData *p)
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{
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uint32_t code= -1;
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int pic=0, seq=0, slice=0, pspack=0, pes=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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switch(code){
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case SEQ_START_CODE: seq++; break;
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case PICTURE_START_CODE: pic++; break;
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case SLICE_START_CODE: slice++; break;
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case PACK_START_CODE: pspack++; break;
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}
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if ((code & 0x1f0) == VIDEO_ID) pes++;
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else if((code & 0x1e0) == AUDIO_ID) pes++;
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}
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}
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if(seq && seq*9<=pic*10 && pic*9<=slice*10 && !pspack && !pes)
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return pic>1 ? AVPROBE_SCORE_MAX/2+1 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
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return 0;
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}
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FF_DEF_RAWVIDEO_DEMUXER(mpegvideo, "raw MPEG video", mpegvideo_probe, NULL, CODEC_ID_MPEG1VIDEO)
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