forked from osmocom/wireshark
![Bill Meier](/assets/img/avatar_default.png)
Change-Id: I8cad872cee972a6d22a72852dac57fd188daca84 Reviewed-on: https://code.wireshark.org/review/4683 Reviewed-by: Bill Meier <wmeier@newsguy.com>
108 lines
2.9 KiB
C
108 lines
2.9 KiB
C
/* mpeg-audio.c
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*
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* MPEG Audio header dissection
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* Written by Shaun Jackman <sjackman@gmail.com>
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* Copyright 2007 Shaun Jackman
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*
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* Wiretap Library
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; 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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#include "mpeg-audio.h"
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static const int mpa_versions[4] = { 2, -1, 1, 0 };
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static const int mpa_layers[4] = { -1, 2, 1, 0 };
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static const unsigned int mpa_samples_data[3][3] = {
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{ 384, 1152, 1152 },
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{ 384, 1152, 576 },
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{ 384, 1152, 576 },
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};
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static const unsigned int mpa_bitrates[3][3][16] = { /* kb/s */
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{
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{ 0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448 },
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{ 0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384 },
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{ 0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320 },
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},
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{
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{ 0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256 },
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{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160 },
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{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160 },
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},
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{
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{ 0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256 },
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{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160 },
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{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160 },
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},
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};
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static const unsigned int mpa_frequencies[3][4] = {
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{ 44100, 48000, 32000 },
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{ 22050, 24000, 16000 },
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{ 11025, 12000, 8000 },
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};
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static const unsigned int mpa_padding_data[3] = { 4, 1, 1 };
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int
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mpa_version(const struct mpa *mpa)
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{
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return mpa_versions[mpa->version];
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}
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int
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mpa_layer(const struct mpa *mpa)
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{
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return mpa_layers[mpa->layer];
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}
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unsigned
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mpa_samples(const struct mpa *mpa)
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{
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return mpa_samples_data[mpa_versions[mpa->version]][mpa_layer(mpa)];
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}
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unsigned
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mpa_bitrate(const struct mpa *mpa)
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{
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return (1000 * (mpa_bitrates[mpa_versions[mpa->version]][mpa_layers[mpa->layer]][mpa->bitrate]));
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}
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unsigned
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mpa_frequency(const struct mpa *mpa)
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{
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return(mpa_frequencies[mpa_versions[mpa->version]][mpa->frequency]);
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}
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unsigned
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mpa_padding(const struct mpa *mpa)
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{
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return(mpa->padding ? mpa_padding_data[mpa_layers[mpa->layer]] : 0);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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