mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
50 lines
1.4 KiB
50 lines
1.4 KiB
/* |
|
* MPEG Audio common code |
|
* Copyright (c) 2001, 2002 Fabrice Bellard. |
|
* |
|
* This file is part of FFmpeg. |
|
* |
|
* FFmpeg is free software; you can redistribute it and/or |
|
* modify it under the terms of the GNU Lesser General Public |
|
* License as published by the Free Software Foundation; either |
|
* version 2.1 of the License, or (at your option) any later version. |
|
* |
|
* FFmpeg is distributed in the hope that it will be useful, |
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
* Lesser General Public License for more details. |
|
* |
|
* You should have received a copy of the GNU Lesser General Public |
|
* License along with FFmpeg; if not, write to the Free Software |
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
|
*/ |
|
|
|
/** |
|
* @file mpegaudio.c |
|
* MPEG Audio common code. |
|
*/ |
|
|
|
#include "mpegaudio.h" |
|
|
|
|
|
/* bitrate is in kb/s */ |
|
int ff_mpa_l2_select_table(int bitrate, int nb_channels, int freq, int lsf) |
|
{ |
|
int ch_bitrate, table; |
|
|
|
ch_bitrate = bitrate / nb_channels; |
|
if (!lsf) { |
|
if ((freq == 48000 && ch_bitrate >= 56) || |
|
(ch_bitrate >= 56 && ch_bitrate <= 80)) |
|
table = 0; |
|
else if (freq != 48000 && ch_bitrate >= 96) |
|
table = 1; |
|
else if (freq != 32000 && ch_bitrate <= 48) |
|
table = 2; |
|
else |
|
table = 3; |
|
} else { |
|
table = 4; |
|
} |
|
return table; |
|
}
|
|
|