sbrtabs.c

nds上大名鼎鼎的DSOrganize 2.8最新源代码。很值得研究。

/* ***** BEGIN LICENSE BLOCK *****  
 * Source last modified: $Id: sbrtabs.c,v 1.1.2.1 2005/02/26 02:05:12 jrecker Exp $ 
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 * Portions Copyright (c) 1995-2005 RealNetworks, Inc. All Rights Reserved.  
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 * the file under the current version of the RealNetworks Community 
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 * will apply. You may also obtain the license terms directly from 
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 * to this file, the RCSL.  Please see the applicable RPSL or RCSL for 
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 * This file is part of the Helix DNA Technology. RealNetworks is the 
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/**************************************************************************************
 * Fixed-point HE-AAC decoder
 * Jon Recker ([e-mail])
 * February 2005
 *
 * sbrtabs.c - platform-independent tables for SBR (global, read-only)
 **************************************************************************************/

#include "sbr.h"

/* k0Tab[sampRateIdx][k] = k0 = startMin + offset(bs_start_freq) for given sample rate (4.6.18.3.2.1) 
 * downsampled (single-rate) SBR not currently supported
 */
const unsigned char k0Tab[NUM_SAMPLE_RATES_SBR][16] = {
    {  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 16, 18, 20, 23, 27, 31 }, /* 96 kHz */
    {  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 16, 18, 20, 23, 27, 31 }, /* 88 kHz */
    {  6,  8,  9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 21, 23, 26, 30 }, /* 64 kHz */
    {  7,  9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 22, 24, 27, 31 }, /* 48 kHz */
    {  8, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 23, 25, 28, 32 }, /* 44 kHz */
    { 10, 12, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 25, 27, 29, 32 }, /* 32 kHz */
    { 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 25, 27, 29, 32 }, /* 24 kHz */
    { 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26, 28, 30 }, /* 22 kHz */
    { 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31 }, /* 16 kHz */
};

/* k2Tab[sampRateIdx][k] = stopVector(bs_stop_freq) for given sample rate, bs_stop_freq = [0, 13] (4.6.18.3.2.1)
 * generated with Matlab script calc_stopvec.m
 * downsampled (single-rate) SBR not currently supported
 */
const unsigned char k2Tab[NUM_SAMPLE_RATES_SBR][14] = {
	{ 13, 15, 17, 19, 21, 24, 27, 31, 35, 39, 44, 50, 57, 64 }, /* 96 kHz */
	{ 15, 17, 19, 21, 23, 26, 29, 33, 37, 41, 46, 51, 57, 64 }, /* 88 kHz */
	{ 20, 22, 24, 26, 28, 31, 34, 37, 41, 45, 49, 54, 59, 64 }, /* 64 kHz */
	{ 21, 23, 25, 27, 29, 32, 35, 38, 41, 45, 49, 54, 59, 64 }, /* 48 kHz */
	{ 23, 25, 27, 29, 31, 34, 37, 40, 43, 47, 51, 55, 59, 64 }, /* 44 kHz */
	{ 32, 34, 36, 38, 40, 42, 44, 46, 49, 52, 55, 58, 61, 64 }, /* 32 kHz */
	{ 32, 34, 36, 38, 40, 42, 44, 46, 49, 52, 55, 58, 61, 64 }, /* 24 kHz */
	{ 35, 36, 38, 40, 42, 44, 46, 48, 50, 52, 55, 58, 61, 64 }, /* 22 kHz */
	{ 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 60, 62, 64 }, /* 16 kHz */
};

/* NINT(2.048E6 / Fs) (figure 4.47) 
 * downsampled (single-rate) SBR not currently supported
 */
const unsigned char goalSBTab[NUM_SAMPLE_RATES_SBR] = { 
	21, 23, 32, 43, 46, 64, 85, 93, 128
};

const HuffInfo huffTabSBRInfo[10] = {
	{19, { 0,  2,  2,  2,  2,  2,  2,  2,  2,  2,  1,  2,  3,  4,  2,  7,  4,  8, 72,  0},   0},
	{20, { 0,  2,  2,  2,  2,  2,  1,  3,  3,  2,  4,  4,  4,  3,  2,  5,  6, 13, 15, 46}, 121},
	{17, { 1,  1,  1,  1,  1,  1,  1,  1,  1,  0,  2,  2,  0,  0,  1, 25, 10,  0,  0,  0}, 242},
	{19, { 1,  1,  1,  1,  1,  1,  1,  1,  1,  0,  3,  1,  0,  1,  1,  2,  1, 29,  2,  0}, 291},
	{19, { 1,  1,  1,  1,  1,  1,  1,  1,  1,  0,  2,  1,  2,  5,  1,  4,  2,  3, 34,  0}, 340},
	{20, { 1,  1,  1,  1,  1,  1,  0,  2,  2,  2,  2,  2,  1,  2,  3,  4,  4,  7, 10, 16}, 403},
	{14, { 1,  1,  1,  1,  1,  1,  1,  1,  1,  0,  0,  1, 13,  2,  0,  0,  0,  0,  0,  0}, 466},
	{14, { 1,  1,  1,  1,  1,  1,  1,  1,  1,  0,  1,  1,  6,  8,  0,  0,  0,  0,  0,  0}, 491},
	{14, { 1,  1,  1,  1,  1,  1,  0,  2,  0,  1,  1,  0, 51,  2,  0,  0,  0,  0,  0,  0}, 516},
	{ 8, { 1,  1,  1,  0,  1,  1,  0, 20,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0}, 579},
};

/* Huffman tables from appendix 4.A.6.1, includes offset of -LAV[i] for table i */
const signed short huffTabSBR[604] = {
	    /* SBR table sbr_tenv15 [121] (signed) */
	   0,   -1,    1,   -2,    2,   -3,    3,   -4,    4,   -5,    5,   -6,    6,   -7,    7,   -8, 
	  -9,    8,  -10,    9,  -11,   10,  -12,  -13,   11,  -14,   12,  -15,  -16,   13,  -19,  -18, 
	 -17,   14,  -24,  -20,   16,  -26,  -21,   15,  -23,  -25,  -22,  -60,  -59,  -58,  -57,  -56, 
	 -55,  -54,  -53,  -52,  -51,  -50,  -49,  -48,  -47,  -46,  -45,  -44,  -43,  -42,  -41,  -40, 
	 -39,  -38,  -37,  -36,  -35,  -34,  -33,  -32,  -31,  -30,  -29,  -28,  -27,   17,   18,   19, 
	  20,   21,   22,   23,   24,   25,   26,   27,   28,   29,   30,   31,   32,   33,   34,   35, 
	  36,   37,   38,   39,   40,   41,   42,   43,   44,   45,   46,   47,   48,   49,   50,   51, 
	  52,   53,   54,   55,   56,   57,   58,   59,   60, 
	    /* SBR table sbr_fenv15 [121] (signed) */
	   0,   -1,    1,   -2,   -3,    2,   -4,    3,   -5,    4,   -6,    5,   -7,    6,   -8,    7, 
	  -9,    8,  -10,    9,  -11,   10,   11,  -12,   12,  -13,   13,   14,  -14,  -15,   15,   16, 
	  17,  -16,  -17,  -18,  -19,   18,   19,  -20,  -21,   20,   21,  -24,  -23,  -22,  -26,  -28, 
	  22,   23,   25,  -41,  -25,   26,   27,  -30,  -27,   24,   28,   44,  -51,  -46,  -44,  -43, 
	 -37,  -33,  -31,  -29,   30,   37,   42,   47,   48,  -60,  -59,  -58,  -57,  -56,  -55,  -54, 
	 -53,  -52,  -50,  -49,  -48,  -47,  -45,  -42,  -40,  -39,  -38,  -36,  -35,  -34,  -32,   29, 
	  31,   32,   33,   34,   35,   36,   38,   39,   40,   41,   43,   45,   46,   49,   50,   51, 
	  52,   53,   54,   55,   56,   57,   58,   59,   60, 
	    /* SBR table sbr_tenv15b [49] (signed) */
	   0,    1,   -1,    2,   -2,    3,   -3,    4,   -4,   -5,    5,   -6,    6,    7,   -7,    8, 
	 -24,  -23,  -22,  -21,  -20,  -19,  -18,  -17,  -16,  -15,  -14,  -13,  -12,  -11,  -10,   -9, 
	  -8,    9,   10,   11,   12,   13,   14,   15,   16,   17,   18,   19,   20,   21,   22,   23, 
	  24, 
	    /* SBR table sbr_fenv15b [49] (signed) */
	   0,   -1,    1,   -2,    2,    3,   -3,   -4,    4,   -5,    5,   -6,    6,   -7,    7,    8, 
	  -9,   -8,  -24,  -23,  -22,  -21,  -20,  -19,  -18,  -17,  -16,  -15,  -14,  -13,  -12,  -11, 
	 -10,    9,   10,   11,   12,   13,   14,   15,   16,   17,   18,   19,   20,   21,   22,   23, 
	  24, 
	    /* SBR table sbr_tenv30 [63] (signed) */
	   0,   -1,    1,   -2,    2,   -3,    3,   -4,    4,   -5,    5,   -6,   -7,    6,   -8,    7, 
	  -9,  -10,    8,    9,   10,  -13,  -11,  -12,  -14,   11,   12,  -31,  -30,  -29,  -28,  -27, 
	 -26,  -25,  -24,  -23,  -22,  -21,  -20,  -19,  -18,  -17,  -16,  -15,   13,   14,   15,   16, 
	  17,   18,   19,   20,   21,   22,   23,   24,   25,   26,   27,   28,   29,   30,   31, 
	    /* SBR table sbr_fenv30 [63] (signed) */