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