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51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
/*
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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 mpegaudio.c
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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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