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.
52 lines
1.9 KiB
52 lines
1.9 KiB
/* |
|
* RAW MPEG-4 video demuxer |
|
* Copyright (c) 2006 Thijs Vermeir <thijs.vermeir@barco.com> |
|
* |
|
* This file is part of Libav. |
|
* |
|
* Libav 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. |
|
* |
|
* Libav 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 Libav; 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 AVPROBE_SCORE_MAX/2; |
|
return 0; |
|
} |
|
|
|
FF_DEF_RAWVIDEO_DEMUXER(m4v, "raw MPEG-4 video format", mpeg4video_probe, "m4v", CODEC_ID_MPEG4)
|
|
|