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2ba45a60 DM |
1 | /* |
2 | * MPEG Audio common code | |
3 | * Copyright (c) 2001, 2002 Fabrice Bellard | |
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 | ||
22 | /** | |
23 | * @file | |
24 | * MPEG Audio common code. | |
25 | */ | |
26 | ||
27 | #include "mpegaudio.h" | |
28 | ||
29 | ||
30 | /* bitrate is in kb/s */ | |
31 | int ff_mpa_l2_select_table(int bitrate, int nb_channels, int freq, int lsf) | |
32 | { | |
33 | int ch_bitrate, table; | |
34 | ||
35 | ch_bitrate = bitrate / nb_channels; | |
36 | if (!lsf) { | |
37 | if ((freq == 48000 && ch_bitrate >= 56) || | |
38 | (ch_bitrate >= 56 && ch_bitrate <= 80)) | |
39 | table = 0; | |
40 | else if (freq != 48000 && ch_bitrate >= 96) | |
41 | table = 1; | |
42 | else if (freq != 32000 && ch_bitrate <= 48) | |
43 | table = 2; | |
44 | else | |
45 | table = 3; | |
46 | } else { | |
47 | table = 4; | |
48 | } | |
49 | return table; | |
50 | } |