2 * RAW MPEG video demuxer
3 * Copyright (c) 2002-2003 Fabrice Bellard
4 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #include "libavutil/intreadwrite.h"
28 #define SEQ_START_CODE 0x000001b3
29 #define GOP_START_CODE 0x000001b8
30 #define PICTURE_START_CODE 0x00000100
31 #define SLICE_START_CODE 0x00000101
32 #define PACK_START_CODE 0x000001ba
33 #define VIDEO_ID 0x000001e0
34 #define AUDIO_ID 0x000001c0
36 static int mpegvideo_probe(AVProbeData
*p
)
39 int pic
=0, seq
=0, slice
=0, pspack
=0, vpes
=0, apes
=0, res
=0, sicle
=0;
43 for(i
=0; i
<p
->buf_size
; i
++){
44 code
= (code
<<8) + p
->buf
[i
];
45 if ((code
& 0xffffff00) == 0x100) {
48 if (!(p
->buf
[i
+1+3+1+2] & 0x20))
59 if (AV_RB24(p
->buf
+ j
+ 9) & 0xFFFFFE)
63 case PICTURE_START_CODE
: pic
++; break;
64 case PACK_START_CODE
: pspack
++; break;
68 if (code
>= SLICE_START_CODE
&& code
<= 0x1af) {
69 if (last
>= SLICE_START_CODE
&& last
<= 0x1af) {
70 if (code
>= last
) slice
++;
73 if (code
== SLICE_START_CODE
) slice
++;
77 if ((code
& 0x1f0) == VIDEO_ID
) vpes
++;
78 else if((code
& 0x1e0) == AUDIO_ID
) apes
++;
82 if(seq
&& seq
*9<=pic
*10 && pic
*9<=slice
*10 && !pspack
&& !apes
&& !res
&& slice
> sicle
) {
83 if(vpes
) return AVPROBE_SCORE_EXTENSION
/ 4;
84 else return pic
>1 ? AVPROBE_SCORE_EXTENSION
+ 1 : AVPROBE_SCORE_EXTENSION
/ 2; // +1 for .mpg
89 FF_DEF_RAWVIDEO_DEMUXER(mpegvideo
, "raw MPEG video", mpegvideo_probe
, NULL
, AV_CODEC_ID_MPEG1VIDEO
)