2 * RAW H.264 video demuxer
3 * Copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at>
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 static int h264_probe(AVProbeData
*p
)
28 int sps
= 0, pps
= 0, idr
= 0, res
= 0, sli
= 0;
31 for (i
= 0; i
< p
->buf_size
; i
++) {
32 code
= (code
<< 8) + p
->buf
[i
];
33 if ((code
& 0xffffff00) == 0x100) {
34 int ref_idc
= (code
>> 5) & 3;
35 int type
= code
& 0x1F;
36 static const int8_t ref_zero
[] = {
37 2, 0, 0, 0, 0, -1, 1, -1,
38 -1, 1, 1, 1, 1, -1, 2, 2,
39 2, 2, 2, 0, 2, 2, 2, 2,
40 2, 2, 2, 2, 2, 2, 2, 2
43 if (code
& 0x80) // forbidden_bit
46 if (ref_zero
[type
] == 1 && ref_idc
)
48 if (ref_zero
[type
] == -1 && !ref_idc
)
50 if (ref_zero
[type
] == 2)
61 if (p
->buf
[i
+ 2] & 0x03)
72 if (sps
&& pps
&& (idr
|| sli
> 3) && res
< (sps
+ pps
+ idr
))
73 return AVPROBE_SCORE_EXTENSION
+ 1; // 1 more than .mpg
78 FF_DEF_RAWVIDEO_DEMUXER(h264
, "raw H.264 video", h264_probe
, "h26l,h264,264,avc", AV_CODEC_ID_H264
)