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FFmpeg/libavformat/m4vdec.c
Michael Niedermayer f083b4c338 Merge commit 'e0f8be6413b6a8d334d6052e610af32935c310af'
* commit 'e0f8be6413b6a8d334d6052e610af32935c310af':
  avformat: Add AVPROBE_SCORE_EXTENSION define and use where appropriate

Conflicts:
	libavformat/ac3dec.c
	libavformat/avformat.h
	libavformat/avs.c
	libavformat/m4vdec.c
	libavformat/mov.c
	libavformat/mp3dec.c
	libavformat/mpeg.c
	libavformat/mpegvideodec.c
	libavformat/psxstr.c
	libavformat/pva.c
	libavformat/utils.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2013-05-05 12:31:03 +02:00

53 lines
2.0 KiB
C

/*
* RAW MPEG-4 video demuxer
* Copyright (c) 2006 Thijs Vermeir <thijs.vermeir@barco.com>
*
* 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"
#define VISUAL_OBJECT_START_CODE 0x000001b5
#define VOP_START_CODE 0x000001b6
static int mpeg4video_probe(AVProbeData *probe_packet)
{
uint32_t temp_buffer= -1;
int VO=0, VOL=0, VOP = 0, VISO = 0, res=0;
int i;
for(i=0; i<probe_packet->buf_size; i++){
temp_buffer = (temp_buffer<<8) + probe_packet->buf[i];
if ((temp_buffer & 0xffffff00) != 0x100)
continue;
if (temp_buffer == VOP_START_CODE) VOP++;
else if (temp_buffer == VISUAL_OBJECT_START_CODE) VISO++;
else if (temp_buffer < 0x120) VO++;
else if (temp_buffer < 0x130) VOL++;
else if ( !(0x1AF < temp_buffer && temp_buffer < 0x1B7)
&& !(0x1B9 < temp_buffer && temp_buffer < 0x1C4)) res++;
}
if (VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0 && res==0)
return VOP+VO > 3 ? AVPROBE_SCORE_EXTENSION : AVPROBE_SCORE_EXTENSION/2;
return 0;
}
FF_DEF_RAWVIDEO_DEMUXER(m4v, "raw MPEG-4 video", mpeg4video_probe, "m4v", AV_CODEC_ID_MPEG4)