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 |
|
7261 |
int ff_mpa_l2_select_table(int bitrate, int nb_channels, int freq, int lsf) |
32 |
|
|
{ |
33 |
|
|
int ch_bitrate, table; |
34 |
|
|
|
35 |
|
7261 |
ch_bitrate = bitrate / nb_channels; |
36 |
✓✗ |
7261 |
if (!lsf) { |
37 |
✓✓✗✓ ✓✗ |
7261 |
if ((freq == 48000 && ch_bitrate >= 56) || |
38 |
✓✓ |
7078 |
(ch_bitrate >= 56 && ch_bitrate <= 80)) |
39 |
|
838 |
table = 0; |
40 |
✓✗✓✗
|
6423 |
else if (freq != 48000 && ch_bitrate >= 96) |
41 |
|
6423 |
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 |
|
7261 |
return table; |
50 |
|
|
} |