mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
60 lines
2.1 KiB
60 lines
2.1 KiB
/* |
|
* 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 & 0xfffffe00) |
|
continue; |
|
if (temp_buffer < 2) |
|
continue; |
|
|
|
if (temp_buffer == VOP_START_CODE) |
|
VOP++; |
|
else if (temp_buffer == VISUAL_OBJECT_START_CODE) |
|
VISO++; |
|
else if (temp_buffer >= 0x100 && temp_buffer < 0x120) |
|
VO++; |
|
else if (temp_buffer >= 0x120 && 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 > 4 ? 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)
|
|
|