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5
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1 /*
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2 * SpanDSP - a series of DSP components for telephony
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3 *
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4 * g722_decode.c - The ITU G.722 codec, decode part.
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5 *
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6 * Written by Steve Underwood <steveu@coppice.org>
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7 *
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8 * Copyright (C) 2005 Steve Underwood
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9 *
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10 * All rights reserved.
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11 *
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12 * This program is free software; you can redistribute it and/or modify
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13 * it under the terms of the GNU General Public License version 2, as
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14 * published by the Free Software Foundation.
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15 *
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16 * This program is distributed in the hope that it will be useful,
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17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 * GNU General Public License for more details.
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20 *
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21 * You should have received a copy of the GNU General Public License
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22 * along with this program; if not, write to the Free Software
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23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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24 *
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25 * Based in part on a single channel G.722 codec which is:
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26 *
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27 * Copyright (c) CMU 1993
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28 * Computer Science, Speech Group
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29 * Chengxiang Lu and Alex Hauptmann
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30 *
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31 * $Id: g722_decode.c,v 1.18 2006/11/19 14:07:24 steveu Exp $
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32 */
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33
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34 /*! \file */
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35
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36 #ifdef HAVE_CONFIG_H
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37 #include <config.h>
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38 #endif
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39
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40 #include <inttypes.h>
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41 #include <memory.h>
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42 #include <stdlib.h>
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43 #if defined(HAVE_TGMATH_H)
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44 #include <tgmath.h>
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45 #endif
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46 #if defined(HAVE_MATH_H)
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47 #include <math.h>
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48 #endif
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49
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50 #include "spandsp/telephony.h"
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51 #include "spandsp/dc_restore.h"
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52 #include "spandsp/g722.h"
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53
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54 static void block4(g722_decode_state_t *s, int band, int d);
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55
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56 static void block4(g722_decode_state_t *s, int band, int d)
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57 {
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58 int wd1;
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59 int wd2;
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60 int wd3;
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61 int i;
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62
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63 /* Block 4, RECONS */
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64 s->band[band].d[0] = d;
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65 s->band[band].r[0] = saturate(s->band[band].s + d);
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66
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67 /* Block 4, PARREC */
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68 s->band[band].p[0] = saturate(s->band[band].sz + d);
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69
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70 /* Block 4, UPPOL2 */
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71 for (i = 0; i < 3; i++)
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72 s->band[band].sg[i] = s->band[band].p[i] >> 15;
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73 wd1 = saturate(s->band[band].a[1] << 2);
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74
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75 wd2 = (s->band[band].sg[0] == s->band[band].sg[1]) ? -wd1 : wd1;
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76 if (wd2 > 32767)
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77 wd2 = 32767;
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78 wd3 = (s->band[band].sg[0] == s->band[band].sg[2]) ? 128 : -128;
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79 wd3 += (wd2 >> 7);
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80 wd3 += (s->band[band].a[2]*32512) >> 15;
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81 if (wd3 > 12288)
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82 wd3 = 12288;
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83 else if (wd3 < -12288)
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84 wd3 = -12288;
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85 s->band[band].ap[2] = wd3;
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86
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87 /* Block 4, UPPOL1 */
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88 s->band[band].sg[0] = s->band[band].p[0] >> 15;
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89 s->band[band].sg[1] = s->band[band].p[1] >> 15;
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90 wd1 = (s->band[band].sg[0] == s->band[band].sg[1]) ? 192 : -192;
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91 wd2 = (s->band[band].a[1]*32640) >> 15;
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92
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93 s->band[band].ap[1] = saturate(wd1 + wd2);
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94 wd3 = saturate(15360 - s->band[band].ap[2]);
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95 if (s->band[band].ap[1] > wd3)
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96 s->band[band].ap[1] = wd3;
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97 else if (s->band[band].ap[1] < -wd3)
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98 s->band[band].ap[1] = -wd3;
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99
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100 /* Block 4, UPZERO */
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101 wd1 = (d == 0) ? 0 : 128;
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102 s->band[band].sg[0] = d >> 15;
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103 for (i = 1; i < 7; i++)
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104 {
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105 s->band[band].sg[i] = s->band[band].d[i] >> 15;
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106 wd2 = (s->band[band].sg[i] == s->band[band].sg[0]) ? wd1 : -wd1;
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107 wd3 = (s->band[band].b[i]*32640) >> 15;
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108 s->band[band].bp[i] = saturate(wd2 + wd3);
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109 }
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110
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111 /* Block 4, DELAYA */
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112 for (i = 6; i > 0; i--)
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113 {
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114 s->band[band].d[i] = s->band[band].d[i - 1];
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115 s->band[band].b[i] = s->band[band].bp[i];
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116 }
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117
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118 for (i = 2; i > 0; i--)
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119 {
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120 s->band[band].r[i] = s->band[band].r[i - 1];
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121 s->band[band].p[i] = s->band[band].p[i - 1];
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122 s->band[band].a[i] = s->band[band].ap[i];
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123 }
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124
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125 /* Block 4, FILTEP */
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126 wd1 = saturate(s->band[band].r[1] + s->band[band].r[1]);
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127 wd1 = (s->band[band].a[1]*wd1) >> 15;
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128 wd2 = saturate(s->band[band].r[2] + s->band[band].r[2]);
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129 wd2 = (s->band[band].a[2]*wd2) >> 15;
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130 s->band[band].sp = saturate(wd1 + wd2);
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131
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132 /* Block 4, FILTEZ */
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133 s->band[band].sz = 0;
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134 for (i = 6; i > 0; i--)
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135 {
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136 wd1 = saturate(s->band[band].d[i] + s->band[band].d[i]);
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137 s->band[band].sz += (s->band[band].b[i]*wd1) >> 15;
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138 }
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139 s->band[band].sz = saturate(s->band[band].sz);
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140
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141 /* Block 4, PREDIC */
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142 s->band[band].s = saturate(s->band[band].sp + s->band[band].sz);
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143 }
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144 /*- End of function --------------------------------------------------------*/
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145
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146 g722_decode_state_t *g722_decode_init(g722_decode_state_t *s, int rate, int options)
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147 {
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148 if (s == NULL)
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149 {
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150 if ((s = (g722_decode_state_t *) malloc(sizeof(*s))) == NULL)
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151 return NULL;
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152 }
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153 memset(s, 0, sizeof(*s));
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154 if (rate == 48000)
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155 s->bits_per_sample = 6;
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156 else if (rate == 56000)
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157 s->bits_per_sample = 7;
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158 else
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159 s->bits_per_sample = 8;
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160 if ((options & G722_SAMPLE_RATE_8000))
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161 s->eight_k = TRUE;
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162 if ((options & G722_PACKED) && s->bits_per_sample != 8)
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163 s->packed = TRUE;
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164 else
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165 s->packed = FALSE;
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166 s->band[0].det = 32;
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167 s->band[1].det = 8;
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168 return s;
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169 }
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170 /*- End of function --------------------------------------------------------*/
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171
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172 int g722_decode_release(g722_decode_state_t *s)
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173 {
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174 free(s);
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175 return 0;
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176 }
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177 /*- End of function --------------------------------------------------------*/
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178
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179 int g722_decode(g722_decode_state_t *s, int16_t amp[], const uint8_t g722_data[], int len)
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180 {
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181 static const int wl[8] = {-60, -30, 58, 172, 334, 538, 1198, 3042 };
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182 static const int rl42[16] = {0, 7, 6, 5, 4, 3, 2, 1, 7, 6, 5, 4, 3, 2, 1, 0 };
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183 static const int ilb[32] =
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184 {
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185 2048, 2093, 2139, 2186, 2233, 2282, 2332,
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186 2383, 2435, 2489, 2543, 2599, 2656, 2714,
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187 2774, 2834, 2896, 2960, 3025, 3091, 3158,
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188 3228, 3298, 3371, 3444, 3520, 3597, 3676,
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189 3756, 3838, 3922, 4008
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190 };
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191 static const int wh[3] = {0, -214, 798};
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192 static const int rh2[4] = {2, 1, 2, 1};
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193 static const int qm2[4] = {-7408, -1616, 7408, 1616};
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194 static const int qm4[16] =
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195 {
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196 0, -20456, -12896, -8968,
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197 -6288, -4240, -2584, -1200,
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198 20456, 12896, 8968, 6288,
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199 4240, 2584, 1200, 0
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200 };
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201 static const int qm5[32] =
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202 {
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203 -280, -280, -23352, -17560,
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204 -14120, -11664, -9752, -8184,
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205 -6864, -5712, -4696, -3784,
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206 -2960, -2208, -1520, -880,
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207 23352, 17560, 14120, 11664,
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208 9752, 8184, 6864, 5712,
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209 4696, 3784, 2960, 2208,
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210 1520, 880, 280, -280
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211 };
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212 static const int qm6[64] =
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213 {
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214 -136, -136, -136, -136,
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215 -24808, -21904, -19008, -16704,
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216 -14984, -13512, -12280, -11192,
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217 -10232, -9360, -8576, -7856,
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218 -7192, -6576, -6000, -5456,
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219 -4944, -4464, -4008, -3576,
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220 -3168, -2776, -2400, -2032,
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221 -1688, -1360, -1040, -728,
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222 24808, 21904, 19008, 16704,
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223 14984, 13512, 12280, 11192,
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224 10232, 9360, 8576, 7856,
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225 7192, 6576, 6000, 5456,
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226 4944, 4464, 4008, 3576,
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227 3168, 2776, 2400, 2032,
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228 1688, 1360, 1040, 728,
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229 432, 136, -432, -136
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230 };
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231 static const int qmf_coeffs[12] =
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232 {
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233 3, -11, 12, 32, -210, 951, 3876, -805, 362, -156, 53, -11,
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234 };
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235
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236 int dlowt;
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237 int rlow;
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238 int ihigh;
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239 int dhigh;
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240 int rhigh;
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241 int xout1;
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242 int xout2;
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243 int wd1;
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244 int wd2;
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245 int wd3;
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246 int code;
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247 int outlen;
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248 int i;
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249 int j;
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250
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251 outlen = 0;
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252 rhigh = 0;
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253 for (j = 0; j < len; )
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254 {
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255 if (s->packed)
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256 {
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257 /* Unpack the code bits */
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258 if (s->in_bits < s->bits_per_sample)
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259 {
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260 s->in_buffer |= (g722_data[j++] << s->in_bits);
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261 s->in_bits += 8;
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262 }
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263 code = s->in_buffer & ((1 << s->bits_per_sample) - 1);
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264 s->in_buffer >>= s->bits_per_sample;
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265 s->in_bits -= s->bits_per_sample;
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266 }
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267 else
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268 {
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269 code = g722_data[j++];
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270 }
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271
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272 switch (s->bits_per_sample)
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273 {
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274 default:
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275 case 8:
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276 wd1 = code & 0x3F;
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277 ihigh = (code >> 6) & 0x03;
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278 wd2 = qm6[wd1];
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279 wd1 >>= 2;
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280 break;
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281 case 7:
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282 wd1 = code & 0x1F;
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283 ihigh = (code >> 5) & 0x03;
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284 wd2 = qm5[wd1];
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285 wd1 >>= 1;
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286 break;
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287 case 6:
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288 wd1 = code & 0x0F;
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289 ihigh = (code >> 4) & 0x03;
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290 wd2 = qm4[wd1];
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291 break;
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292 }
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293 /* Block 5L, LOW BAND INVQBL */
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294 wd2 = (s->band[0].det*wd2) >> 15;
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295 /* Block 5L, RECONS */
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296 rlow = s->band[0].s + wd2;
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297 /* Block 6L, LIMIT */
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298 if (rlow > 16383)
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299 rlow = 16383;
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300 else if (rlow < -16384)
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301 rlow = -16384;
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302
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303 /* Block 2L, INVQAL */
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304 wd2 = qm4[wd1];
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305 dlowt = (s->band[0].det*wd2) >> 15;
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306
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307 /* Block 3L, LOGSCL */
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308 wd2 = rl42[wd1];
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309 wd1 = (s->band[0].nb*127) >> 7;
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310 wd1 += wl[wd2];
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311 if (wd1 < 0)
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312 wd1 = 0;
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313 else if (wd1 > 18432)
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314 wd1 = 18432;
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315 s->band[0].nb = wd1;
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316
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317 /* Block 3L, SCALEL */
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318 wd1 = (s->band[0].nb >> 6) & 31;
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319 wd2 = 8 - (s->band[0].nb >> 11);
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320 wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2);
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321 s->band[0].det = wd3 << 2;
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322
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323 block4(s, 0, dlowt);
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324
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325 if (!s->eight_k)
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326 {
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327 /* Block 2H, INVQAH */
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328 wd2 = qm2[ihigh];
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329 dhigh = (s->band[1].det*wd2) >> 15;
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330 /* Block 5H, RECONS */
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331 rhigh = dhigh + s->band[1].s;
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332 /* Block 6H, LIMIT */
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333 if (rhigh > 16383)
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334 rhigh = 16383;
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335 else if (rhigh < -16384)
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336 rhigh = -16384;
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337
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338 /* Block 2H, INVQAH */
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339 wd2 = rh2[ihigh];
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340 wd1 = (s->band[1].nb*127) >> 7;
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341 wd1 += wh[wd2];
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342 if (wd1 < 0)
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343 wd1 = 0;
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344 else if (wd1 > 22528)
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345 wd1 = 22528;
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346 s->band[1].nb = wd1;
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347
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348 /* Block 3H, SCALEH */
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349 wd1 = (s->band[1].nb >> 6) & 31;
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350 wd2 = 10 - (s->band[1].nb >> 11);
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351 wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2);
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352 s->band[1].det = wd3 << 2;
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353
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354 block4(s, 1, dhigh);
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355 }
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356
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357 if (s->itu_test_mode)
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358 {
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359 amp[outlen++] = (int16_t) (rlow << 1);
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360 amp[outlen++] = (int16_t) (rhigh << 1);
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361 }
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362 else
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363 {
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364 if (s->eight_k)
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365 {
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366 amp[outlen++] = (int16_t) rlow;
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367 }
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368 else
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369 {
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370 /* Apply the receive QMF */
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371 for (i = 0; i < 22; i++)
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372 s->x[i] = s->x[i + 2];
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373 s->x[22] = rlow + rhigh;
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374 s->x[23] = rlow - rhigh;
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375
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376 xout1 = 0;
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377 xout2 = 0;
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378 for (i = 0; i < 12; i++)
|
|
|
379 {
|
|
|
380 xout2 += s->x[2*i]*qmf_coeffs[i];
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|
|
381 xout1 += s->x[2*i + 1]*qmf_coeffs[11 - i];
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|
|
382 }
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383 amp[outlen++] = (int16_t) (xout1 >> 12);
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|
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384 amp[outlen++] = (int16_t) (xout2 >> 12);
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385 }
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386 }
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|
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387 }
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388 return outlen;
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389 }
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390 /*- End of function --------------------------------------------------------*/
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391 /*- End of file ------------------------------------------------------------*/
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