1 /*
2 * raw ADTS AAC demuxer
3 * Copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at>
4 * Copyright (c) 2009 Robert Swain ( rob opendot cl )
5 *
6 * This file is part of FFmpeg.
7 *
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.
12 *
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.
17 *
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
21 */
22
29
31 {
32 int max_frames = 0, first_frames = 0;
33 int fsize, frames;
38
39 buf = buf0;
40
41 for(; buf <
end; buf= buf2+1) {
43
44 for(frames = 0; buf2 <
end; frames++) {
45 uint32_t header =
AV_RB16(buf2);
46 if((header&0xFFF6) != 0xFFF0)
47 break;
48 fsize = (
AV_RB32(buf2 + 3) >> 13) & 0x1FFF;
49 if(fsize < 7)
50 break;
51 fsize =
FFMIN(fsize, end - buf2);
52 buf2 += fsize;
53 }
54 max_frames =
FFMAX(max_frames, frames);
55 if(buf == buf0)
56 first_frames= frames;
57 }
61 else if(max_frames>=1) return 1;
62 else return 0;
63 }
64
66 {
68
70 if (!st)
72
76
83 }
84
85 //LCM of all possible ADTS sample rates
87
88 return 0;
89 }
90
98 .extensions = "aac",
100 };