1 /*
2 * LOAS AudioSyncStream demuxer
3 * Copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at>
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
27
28 #define LOAS_SYNC_WORD 0x2b7
29
31 {
32 int max_frames = 0, first_frames = 0;
34 const uint8_t *buf0 = p->
buf;
35 const uint8_t *buf2;
36 const uint8_t *buf;
37 const uint8_t *end = buf0 + p->
buf_size - 3;
38 buf = buf0;
39
40 for (; buf < end; buf = buf2 + 1) {
41 buf2 = buf;
42
46 break;
49 break;
52 }
54 if (buf == buf0)
56 }
57
58 if (first_frames >= 3)
60 else if (max_frames > 100)
62 else if (max_frames >= 3)
64 else
65 return 0;
66 }
67
69 {
71
73 if (!st)
75
79
80 //LCM of all possible AAC sample rates
82
83 return 0;
84 }
85
96 };