182 lines
6.7 KiB
C
182 lines
6.7 KiB
C
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: RCSL 1.0/RPSL 1.0
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*
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* Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved.
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*
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* The contents of this file, and the files included with this file, are
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* subject to the current version of the RealNetworks Public Source License
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* Version 1.0 (the "RPSL") available at
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* http://www.helixcommunity.org/content/rpsl unless you have licensed
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* the file under the RealNetworks Community Source License Version 1.0
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* (the "RCSL") available at http://www.helixcommunity.org/content/rcsl,
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* in which case the RCSL will apply. You may also obtain the license terms
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* directly from RealNetworks. You may not use this file except in
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* compliance with the RPSL or, if you have a valid RCSL with RealNetworks
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* applicable to this file, the RCSL. Please see the applicable RPSL or
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* RCSL for the rights, obligations and limitations governing use of the
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* contents of the file.
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*
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* This file is part of the Helix DNA Technology. RealNetworks is the
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* developer of the Original Code and owns the copyrights in the portions
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* it created.
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*
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* This file, and the files included with this file, is distributed and made
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* available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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*
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* Technology Compatibility Kit Test Suite(s) Location:
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* http://www.helixcommunity.org/content/tck
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*
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* Contributor(s):
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*
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* ***** END LICENSE BLOCK ***** */
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/**************************************************************************************
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* Fixed-point MP3 decoder
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* Jon Recker (jrecker@real.com), Ken Cooke (kenc@real.com)
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* June 2003
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*
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* mp3tabs.c - platform-independent tables for MP3 decoder (global, read-only)
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**************************************************************************************/
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#include "mp3common.h"
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/* indexing = [version][samplerate index]
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* sample rate of frame (Hz)
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*/
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const int samplerateTab[3][3] = {
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{44100, 48000, 32000}, /* MPEG-1 */
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{22050, 24000, 16000}, /* MPEG-2 */
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{11025, 12000, 8000}, /* MPEG-2.5 */
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};
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/* indexing = [version][layer][bitrate index]
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* bitrate (kbps) of frame
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* - bitrate index == 0 is "free" mode (bitrate determined on the fly by
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* counting bits between successive sync words)
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*/
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const short bitrateTab[3][3][15] = {
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{
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/* MPEG-1 */
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{ 0, 32, 64, 96,128,160,192,224,256,288,320,352,384,416,448}, /* Layer 1 */
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{ 0, 32, 48, 56, 64, 80, 96,112,128,160,192,224,256,320,384}, /* Layer 2 */
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{ 0, 32, 40, 48, 56, 64, 80, 96,112,128,160,192,224,256,320}, /* Layer 3 */
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},
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{
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/* MPEG-2 */
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{ 0, 32, 48, 56, 64, 80, 96,112,128,144,160,176,192,224,256}, /* Layer 1 */
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{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160}, /* Layer 2 */
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{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160}, /* Layer 3 */
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},
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{
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/* MPEG-2.5 */
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{ 0, 32, 48, 56, 64, 80, 96,112,128,144,160,176,192,224,256}, /* Layer 1 */
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{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160}, /* Layer 2 */
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{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160}, /* Layer 3 */
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},
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};
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/* indexing = [version][layer]
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* number of samples in one frame (per channel)
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*/
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const short samplesPerFrameTab[3][3] = {
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{384, 1152, 1152 }, /* MPEG1 */
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{384, 1152, 576 }, /* MPEG2 */
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{384, 1152, 576 }, /* MPEG2.5 */
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};
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/* layers 1, 2, 3 */
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const short bitsPerSlotTab[3] = {32, 8, 8};
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/* indexing = [version][mono/stereo]
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* number of bytes in side info section of bitstream
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*/
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const short sideBytesTab[3][2] = {
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{17, 32}, /* MPEG-1: mono, stereo */
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{ 9, 17}, /* MPEG-2: mono, stereo */
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{ 9, 17}, /* MPEG-2.5: mono, stereo */
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};
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/* indexing = [version][sampleRate][bitRate]
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* for layer3, nSlots = floor(samps/frame * bitRate / sampleRate / 8)
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* - add one pad slot if necessary
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*/
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const short slotTab[3][3][15] = {
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{
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/* MPEG-1 */
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{ 0, 104, 130, 156, 182, 208, 261, 313, 365, 417, 522, 626, 731, 835,1044 }, /* 44 kHz */
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{ 0, 96, 120, 144, 168, 192, 240, 288, 336, 384, 480, 576, 672, 768, 960 }, /* 48 kHz */
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{ 0, 144, 180, 216, 252, 288, 360, 432, 504, 576, 720, 864,1008,1152,1440 }, /* 32 kHz */
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},
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{
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/* MPEG-2 */
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{ 0, 26, 52, 78, 104, 130, 156, 182, 208, 261, 313, 365, 417, 470, 522 }, /* 22 kHz */
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{ 0, 24, 48, 72, 96, 120, 144, 168, 192, 240, 288, 336, 384, 432, 480 }, /* 24 kHz */
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{ 0, 36, 72, 108, 144, 180, 216, 252, 288, 360, 432, 504, 576, 648, 720 }, /* 16 kHz */
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},
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{
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/* MPEG-2.5 */
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{ 0, 52, 104, 156, 208, 261, 313, 365, 417, 522, 626, 731, 835, 940,1044 }, /* 11 kHz */
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{ 0, 48, 96, 144, 192, 240, 288, 336, 384, 480, 576, 672, 768, 864, 960 }, /* 12 kHz */
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{ 0, 72, 144, 216, 288, 360, 432, 504, 576, 720, 864,1008,1152,1296,1440 }, /* 8 kHz */
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},
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};
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/* indexing = [version][sampleRate][long (.l) or short (.s) block]
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* sfBandTable[v][s].l[cb] = index of first bin in critical band cb (long blocks)
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* sfBandTable[v][s].s[cb] = index of first bin in critical band cb (short blocks)
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*/
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const SFBandTable sfBandTable[3][3] = {
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{
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/* MPEG-1 (44, 48, 32 kHz) */
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{
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{ 0, 4, 8, 12, 16, 20, 24, 30, 36, 44, 52, 62, 74, 90,110,134,162,196,238,288,342,418,576 },
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{ 0, 4, 8, 12, 16, 22, 30, 40, 52, 66, 84,106,136,192 }
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},
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{
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{ 0, 4, 8, 12, 16, 20, 24, 30, 36, 42, 50, 60, 72, 88,106,128,156,190,230,276,330,384,576 },
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{ 0, 4, 8, 12, 16, 22, 28, 38, 50, 64, 80,100,126,192 }
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},
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{
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{ 0, 4, 8, 12, 16, 20, 24, 30, 36, 44, 54, 66, 82,102,126,156,194,240,296,364,448,550,576 },
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{ 0, 4, 8, 12, 16, 22, 30, 42, 58, 78,104,138,180,192 }
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}
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},
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{
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/* MPEG-2 (22, 24, 16 kHz) */
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{
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{ 0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96,116,140,168,200,238,284,336,396,464,522,576 },
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{ 0, 4, 8, 12, 18, 24, 32, 42, 56, 74,100,132,174,192 }
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},
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{
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{ 0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96,114,136,162,194,232,278,332,394,464,540,576 },
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{ 0, 4, 8, 12, 18, 26, 36, 48, 62, 80,104,136,180,192 }
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},
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{
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{ 0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96,116,140,168,200,238,284,336,396,464,522,576 },
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{ 0, 4, 8, 12, 18, 26, 36, 48, 62, 80,104,134,174,192 }
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},
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},
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{
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/* MPEG-2.5 (11, 12, 8 kHz) */
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{
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{ 0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96,116,140,168,200,238,284,336,396,464,522,576 },
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{ 0, 4, 8, 12, 18, 26, 36, 48, 62, 80,104,134,174,192 }
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},
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{
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{ 0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96,116,140,168,200,238,284,336,396,464,522,576 },
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{ 0, 4, 8, 12, 18, 26, 36, 48, 62, 80,104,134,174,192 }
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},
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{
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{ 0, 12, 24, 36, 48, 60, 72, 88,108,132,160,192,232,280,336,400,476,566,568,570,572,574,576 },
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{ 0, 8, 16, 24, 36, 52, 72, 96,124,160,162,164,166,192 }
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},
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},
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};
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