mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-28 20:53:54 +02:00
63 lines
2.2 KiB
C
63 lines
2.2 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_MAX/2 : AVPROBE_SCORE_MAX/4;
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_m4v_demuxer = {
|
|
"m4v",
|
|
NULL_IF_CONFIG_SMALL("raw MPEG-4 video format"),
|
|
0,
|
|
mpeg4video_probe, /** probing for MPEG-4 data */
|
|
ff_raw_video_read_header,
|
|
ff_raw_read_partial_packet,
|
|
.flags= AVFMT_GENERIC_INDEX,
|
|
.extensions = "m4v",
|
|
.value = CODEC_ID_MPEG4,
|
|
};
|