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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_encode.c - The ITU G.722 codec, encode 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 on a single channel 64kbps only 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_encode.c,v 1.16 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_encode_state_t *s, int band, int d)
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55 {
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56 int wd1;
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57 int wd2;
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58 int wd3;
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59 int i;
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60
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61 /* Block 4, RECONS */
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62 s->band[band].d[0] = d;
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63 s->band[band].r[0] = saturate(s->band[band].s + d);
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64
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65 /* Block 4, PARREC */
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66 s->band[band].p[0] = saturate(s->band[band].sz + d);
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67
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68 /* Block 4, UPPOL2 */
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69 for (i = 0; i < 3; i++)
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70 s->band[band].sg[i] = s->band[band].p[i] >> 15;
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71 wd1 = saturate(s->band[band].a[1] << 2);
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72
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73 wd2 = (s->band[band].sg[0] == s->band[band].sg[1]) ? -wd1 : wd1;
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74 if (wd2 > 32767)
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75 wd2 = 32767;
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76 wd3 = (wd2 >> 7) + ((s->band[band].sg[0] == s->band[band].sg[2]) ? 128 : -128);
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77 wd3 += (s->band[band].a[2]*32512) >> 15;
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78 if (wd3 > 12288)
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79 wd3 = 12288;
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80 else if (wd3 < -12288)
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81 wd3 = -12288;
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82 s->band[band].ap[2] = wd3;
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83
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84 /* Block 4, UPPOL1 */
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85 s->band[band].sg[0] = s->band[band].p[0] >> 15;
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86 s->band[band].sg[1] = s->band[band].p[1] >> 15;
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87 wd1 = (s->band[band].sg[0] == s->band[band].sg[1]) ? 192 : -192;
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88 wd2 = (s->band[band].a[1]*32640) >> 15;
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89
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90 s->band[band].ap[1] = saturate(wd1 + wd2);
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91 wd3 = saturate(15360 - s->band[band].ap[2]);
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92 if (s->band[band].ap[1] > wd3)
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93 s->band[band].ap[1] = wd3;
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94 else if (s->band[band].ap[1] < -wd3)
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95 s->band[band].ap[1] = -wd3;
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96
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97 /* Block 4, UPZERO */
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98 wd1 = (d == 0) ? 0 : 128;
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99 s->band[band].sg[0] = d >> 15;
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100 for (i = 1; i < 7; i++)
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101 {
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102 s->band[band].sg[i] = s->band[band].d[i] >> 15;
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103 wd2 = (s->band[band].sg[i] == s->band[band].sg[0]) ? wd1 : -wd1;
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104 wd3 = (s->band[band].b[i]*32640) >> 15;
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105 s->band[band].bp[i] = saturate(wd2 + wd3);
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106 }
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107
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108 /* Block 4, DELAYA */
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109 for (i = 6; i > 0; i--)
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110 {
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111 s->band[band].d[i] = s->band[band].d[i - 1];
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112 s->band[band].b[i] = s->band[band].bp[i];
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113 }
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114
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115 for (i = 2; i > 0; i--)
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116 {
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117 s->band[band].r[i] = s->band[band].r[i - 1];
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118 s->band[band].p[i] = s->band[band].p[i - 1];
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119 s->band[band].a[i] = s->band[band].ap[i];
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120 }
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121
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122 /* Block 4, FILTEP */
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123 wd1 = saturate(s->band[band].r[1] + s->band[band].r[1]);
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124 wd1 = (s->band[band].a[1]*wd1) >> 15;
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125 wd2 = saturate(s->band[band].r[2] + s->band[band].r[2]);
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126 wd2 = (s->band[band].a[2]*wd2) >> 15;
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127 s->band[band].sp = saturate(wd1 + wd2);
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128
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129 /* Block 4, FILTEZ */
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130 s->band[band].sz = 0;
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131 for (i = 6; i > 0; i--)
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132 {
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133 wd1 = saturate(s->band[band].d[i] + s->band[band].d[i]);
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134 s->band[band].sz += (s->band[band].b[i]*wd1) >> 15;
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135 }
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136 s->band[band].sz = saturate(s->band[band].sz);
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137
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138 /* Block 4, PREDIC */
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139 s->band[band].s = saturate(s->band[band].sp + s->band[band].sz);
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140 }
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141 /*- End of function --------------------------------------------------------*/
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142
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143 g722_encode_state_t *g722_encode_init(g722_encode_state_t *s, int rate, int options)
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144 {
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145 if (s == NULL)
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146 {
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147 if ((s = (g722_encode_state_t *) malloc(sizeof(*s))) == NULL)
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148 return NULL;
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149 }
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150 memset(s, 0, sizeof(*s));
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151 if (rate == 48000)
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152 s->bits_per_sample = 6;
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153 else if (rate == 56000)
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154 s->bits_per_sample = 7;
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155 else
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156 s->bits_per_sample = 8;
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157 if ((options & G722_SAMPLE_RATE_8000))
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158 s->eight_k = TRUE;
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159 if ((options & G722_PACKED) && s->bits_per_sample != 8)
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160 s->packed = TRUE;
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161 else
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162 s->packed = FALSE;
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163 s->band[0].det = 32;
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164 s->band[1].det = 8;
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165 return s;
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166 }
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167 /*- End of function --------------------------------------------------------*/
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168
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169 int g722_encode_release(g722_encode_state_t *s)
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170 {
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171 free(s);
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172 return 0;
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173 }
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174 /*- End of function --------------------------------------------------------*/
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175
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176 int g722_encode(g722_encode_state_t *s, uint8_t g722_data[], const int16_t amp[], int len)
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177 {
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178 static const int q6[32] =
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179 {
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180 0, 35, 72, 110, 150, 190, 233, 276,
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181 323, 370, 422, 473, 530, 587, 650, 714,
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182 786, 858, 940, 1023, 1121, 1219, 1339, 1458,
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183 1612, 1765, 1980, 2195, 2557, 2919, 0, 0
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184 };
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185 static const int iln[32] =
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186 {
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187 0, 63, 62, 31, 30, 29, 28, 27,
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188 26, 25, 24, 23, 22, 21, 20, 19,
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189 18, 17, 16, 15, 14, 13, 12, 11,
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190 10, 9, 8, 7, 6, 5, 4, 0
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191 };
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192 static const int ilp[32] =
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193 {
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194 0, 61, 60, 59, 58, 57, 56, 55,
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195 54, 53, 52, 51, 50, 49, 48, 47,
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196 46, 45, 44, 43, 42, 41, 40, 39,
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197 38, 37, 36, 35, 34, 33, 32, 0
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198 };
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199 static const int wl[8] =
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200 {
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201 -60, -30, 58, 172, 334, 538, 1198, 3042
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202 };
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203 static const int rl42[16] =
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204 {
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205 0, 7, 6, 5, 4, 3, 2, 1, 7, 6, 5, 4, 3, 2, 1, 0
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206 };
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207 static const int ilb[32] =
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208 {
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209 2048, 2093, 2139, 2186, 2233, 2282, 2332,
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210 2383, 2435, 2489, 2543, 2599, 2656, 2714,
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211 2774, 2834, 2896, 2960, 3025, 3091, 3158,
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212 3228, 3298, 3371, 3444, 3520, 3597, 3676,
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213 3756, 3838, 3922, 4008
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214 };
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215 static const int qm4[16] =
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216 {
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217 0, -20456, -12896, -8968,
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218 -6288, -4240, -2584, -1200,
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219 20456, 12896, 8968, 6288,
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220 4240, 2584, 1200, 0
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221 };
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222 static const int qm2[4] =
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223 {
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224 -7408, -1616, 7408, 1616
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225 };
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226 static const int qmf_coeffs[12] =
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227 {
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228 3, -11, 12, 32, -210, 951, 3876, -805, 362, -156, 53, -11,
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229 };
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230 static const int ihn[3] = {0, 1, 0};
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231 static const int ihp[3] = {0, 3, 2};
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232 static const int wh[3] = {0, -214, 798};
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233 static const int rh2[4] = {2, 1, 2, 1};
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234
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235 int dlow;
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236 int dhigh;
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237 int el;
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238 int wd;
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239 int wd1;
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240 int ril;
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241 int wd2;
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242 int il4;
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243 int ih2;
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244 int wd3;
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245 int eh;
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246 int mih;
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247 int i;
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248 int j;
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249 /* Low and high band PCM from the QMF */
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250 int xlow;
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251 int xhigh;
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252 int g722_bytes;
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253 /* Even and odd tap accumulators */
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254 int sumeven;
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255 int sumodd;
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256 int ihigh;
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257 int ilow;
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258 int code;
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259
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260 g722_bytes = 0;
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261 xhigh = 0;
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262 for (j = 0; j < len; )
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263 {
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264 if (s->itu_test_mode)
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265 {
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266 xlow =
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267 xhigh = amp[j++] >> 1;
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268 }
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269 else
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270 {
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271 if (s->eight_k)
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272 {
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273 xlow = amp[j++];
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274 }
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275 else
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276 {
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277 /* Apply the transmit QMF */
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278 /* Shuffle the buffer down */
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279 for (i = 0; i < 22; i++)
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280 s->x[i] = s->x[i + 2];
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281 s->x[22] = amp[j++];
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282 s->x[23] = amp[j++];
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283
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284 /* Discard every other QMF output */
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285 sumeven = 0;
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286 sumodd = 0;
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287 for (i = 0; i < 12; i++)
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288 {
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289 sumodd += s->x[2*i]*qmf_coeffs[i];
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290 sumeven += s->x[2*i + 1]*qmf_coeffs[11 - i];
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291 }
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292 xlow = (sumeven + sumodd) >> 13;
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293 xhigh = (sumeven - sumodd) >> 13;
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294 }
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295 }
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296 /* Block 1L, SUBTRA */
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297 el = saturate(xlow - s->band[0].s);
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298
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299 /* Block 1L, QUANTL */
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300 wd = (el >= 0) ? el : -(el + 1);
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301
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302 for (i = 1; i < 30; i++)
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303 {
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304 wd1 = (q6[i]*s->band[0].det) >> 12;
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305 if (wd < wd1)
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306 break;
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307 }
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308 ilow = (el < 0) ? iln[i] : ilp[i];
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309
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310 /* Block 2L, INVQAL */
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311 ril = ilow >> 2;
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312 wd2 = qm4[ril];
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313 dlow = (s->band[0].det*wd2) >> 15;
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314
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315 /* Block 3L, LOGSCL */
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316 il4 = rl42[ril];
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317 wd = (s->band[0].nb*127) >> 7;
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318 s->band[0].nb = wd + wl[il4];
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319 if (s->band[0].nb < 0)
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320 s->band[0].nb = 0;
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321 else if (s->band[0].nb > 18432)
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322 s->band[0].nb = 18432;
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323
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324 /* Block 3L, SCALEL */
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325 wd1 = (s->band[0].nb >> 6) & 31;
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326 wd2 = 8 - (s->band[0].nb >> 11);
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327 wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2);
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328 s->band[0].det = wd3 << 2;
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329
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330 block4(s, 0, dlow);
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331
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332 if (s->eight_k)
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333 {
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334 /* Just leave the high bits as zero */
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335 code = (0xC0 | ilow) >> (8 - s->bits_per_sample);
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336 }
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337 else
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338 {
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339 /* Block 1H, SUBTRA */
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340 eh = saturate(xhigh - s->band[1].s);
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341
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342 /* Block 1H, QUANTH */
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343 wd = (eh >= 0) ? eh : -(eh + 1);
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344 wd1 = (564*s->band[1].det) >> 12;
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345 mih = (wd >= wd1) ? 2 : 1;
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346 ihigh = (eh < 0) ? ihn[mih] : ihp[mih];
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347
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348 /* Block 2H, INVQAH */
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349 wd2 = qm2[ihigh];
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350 dhigh = (s->band[1].det*wd2) >> 15;
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351
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352 /* Block 3H, LOGSCH */
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353 ih2 = rh2[ihigh];
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354 wd = (s->band[1].nb*127) >> 7;
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355 s->band[1].nb = wd + wh[ih2];
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356 if (s->band[1].nb < 0)
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357 s->band[1].nb = 0;
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358 else if (s->band[1].nb > 22528)
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359 s->band[1].nb = 22528;
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360
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361 /* Block 3H, SCALEH */
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362 wd1 = (s->band[1].nb >> 6) & 31;
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363 wd2 = 10 - (s->band[1].nb >> 11);
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364 wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2);
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365 s->band[1].det = wd3 << 2;
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366
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367 block4(s, 1, dhigh);
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368 code = ((ihigh << 6) | ilow) >> (8 - s->bits_per_sample);
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369 }
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370
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371 if (s->packed)
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372 {
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373 /* Pack the code bits */
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374 s->out_buffer |= (code << s->out_bits);
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375 s->out_bits += s->bits_per_sample;
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376 if (s->out_bits >= 8)
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377 {
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378 g722_data[g722_bytes++] = (uint8_t) (s->out_buffer & 0xFF);
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379 s->out_bits -= 8;
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380 s->out_buffer >>= 8;
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|
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381 }
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|
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382 }
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|
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383 else
|
|
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384 {
|
|
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385 g722_data[g722_bytes++] = (uint8_t) code;
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|
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386 }
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|
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387 }
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388 return g722_bytes;
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|
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389 }
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|
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390 /*- End of function --------------------------------------------------------*/
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|
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391 /*- End of file ------------------------------------------------------------*/
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