2 * RAW MPEG-4 video demuxer
3 * Copyright (c) 2006 Thijs Vermeir <thijs.vermeir@barco.com>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 #define VISUAL_OBJECT_START_CODE 0x000001b5
26 #define VOP_START_CODE 0x000001b6
28 static int mpeg4video_probe(AVProbeData
*probe_packet
)
30 uint32_t temp_buffer
= -1;
31 int VO
= 0, VOL
= 0, VOP
= 0, VISO
= 0, res
= 0;
34 for (i
= 0; i
< probe_packet
->buf_size
; i
++) {
35 temp_buffer
= (temp_buffer
<< 8) + probe_packet
->buf
[i
];
36 if (temp_buffer
& 0xfffffe00)
41 if (temp_buffer
== VOP_START_CODE
)
43 else if (temp_buffer
== VISUAL_OBJECT_START_CODE
)
45 else if (temp_buffer
>= 0x100 && temp_buffer
< 0x120)
47 else if (temp_buffer
>= 0x120 && temp_buffer
< 0x130)
49 else if (!(0x1AF < temp_buffer
&& temp_buffer
< 0x1B7) &&
50 !(0x1B9 < temp_buffer
&& temp_buffer
< 0x1C4))
54 if (VOP
>= VISO
&& VOP
>= VOL
&& VO
>= VOL
&& VOL
> 0 && res
== 0)
55 return VOP
+VO
> 4 ? AVPROBE_SCORE_EXTENSION
: AVPROBE_SCORE_EXTENSION
/2;
59 FF_DEF_RAWVIDEO_DEMUXER2(m4v
, "raw MPEG-4 video", mpeg4video_probe
, "m4v",
60 AV_CODEC_ID_MPEG4
, AVFMT_GENERIC_INDEX
| AVFMT_TS_DISCONT
)