2 * RAW H.263 video demuxer
3 * Copyright (c) 2009 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 h263_probe(AVProbeData
*p
)
32 int src_fmt
, last_src_fmt
=-1;
36 for(i
=0; i
<p
->buf_size
; i
++){
37 code
= (code
<<8) + p
->buf
[i
];
38 if ((code
& 0xfffffc000000) == 0x80000000) {
39 tr
= (code
>> 18) & 0xFF;
40 src_fmt
= (code
>>10)&7;
41 if( src_fmt
!= last_src_fmt
42 && last_src_fmt
>0 && last_src_fmt
<6
51 if (src_fmt
!= 7 && !(code
&(1<<9)) && (code
&(1<<5))) {
56 if((code
&0x30000)==0x20000 && src_fmt
){
61 last_src_fmt
= src_fmt
;
63 } else if((code
& 0xffff80000000) == 0x80000000) {
64 int gn
= (code
>>(31-5)) & 0x1F;
71 if(valid_psc
> 2*invalid_psc
+ 2*res_change
+ 3){
72 return AVPROBE_SCORE_EXTENSION
;
73 }else if(valid_psc
> 2*invalid_psc
)
74 return AVPROBE_SCORE_EXTENSION
/ 2;
78 FF_DEF_RAWVIDEO_DEMUXER(h263
, "raw H.263", h263_probe
, NULL
, AV_CODEC_ID_H263
)