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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 * Despite my general liking of the GPL, I place my own contributions |
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13 * to this code in the public domain for the benefit of all mankind - |
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14 * even the slimy ones who might try to proprietize my work and use it |
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15 * to my detriment. |
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16 * |
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17 * Based on a single channel 64kbps only G.722 codec which is: |
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18 * |
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19 ***** Copyright (c) CMU 1993 ***** |
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20 * Computer Science, Speech Group |
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21 * Chengxiang Lu and Alex Hauptmann |
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22 * |
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23 * $Id: g722_encode.c 48661 2006-12-21 00:08:21Z mattf $ |
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24 */ |
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25 |
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26 /*! \file */ |
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27 |
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28 #ifdef HAVE_CONFIG_H |
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29 #include <config.h> |
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30 #endif |
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31 |
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32 #include <stdio.h> |
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33 //#include <inttypes.h> |
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34 #include <memory.h> |
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35 #include <stdlib.h> |
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36 #if 0 |
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37 #include <tgmath.h> |
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38 #endif |
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39 |
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40 #include "g722.h" |
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41 |
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42 #if !defined(FALSE) |
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43 #define FALSE 0 |
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44 #endif |
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45 #if !defined(TRUE) |
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46 #define TRUE (!FALSE) |
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47 #endif |
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48 |
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49 static int16_t saturate(int32_t amp) |
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50 { |
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51 int16_t amp16; |
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52 |
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53 /* Hopefully this is optimised for the common case - not clipping */ |
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54 amp16 = (int16_t) amp; |
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55 if (amp == amp16) |
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56 return amp16; |
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57 if (amp > INT16_MAX) |
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58 return INT16_MAX; |
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59 return INT16_MIN; |
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60 } |
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61 /*- End of function --------------------------------------------------------*/ |
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62 |
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63 static void block4(g722_encode_state_t *s, int band, int d) |
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64 { |
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65 int wd1; |
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66 int wd2; |
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67 int wd3; |
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68 int i; |
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69 |
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70 /* Block 4, RECONS */ |
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71 s->band[band].d[0] = d; |
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72 s->band[band].r[0] = saturate(s->band[band].s + d); |
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73 |
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74 /* Block 4, PARREC */ |
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75 s->band[band].p[0] = saturate(s->band[band].sz + d); |
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76 |
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77 /* Block 4, UPPOL2 */ |
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78 for (i = 0; i < 3; i++) |
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79 s->band[band].sg[i] = s->band[band].p[i] >> 15; |
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80 wd1 = saturate(s->band[band].a[1] << 2); |
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81 |
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82 wd2 = (s->band[band].sg[0] == s->band[band].sg[1]) ? -wd1 : wd1; |
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83 if (wd2 > 32767) |
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84 wd2 = 32767; |
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85 wd3 = (wd2 >> 7) + ((s->band[band].sg[0] == s->band[band].sg[2]) ? 128 : -128); |
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86 wd3 += (s->band[band].a[2]*32512) >> 15; |
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87 if (wd3 > 12288) |
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88 wd3 = 12288; |
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89 else if (wd3 < -12288) |
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90 wd3 = -12288; |
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91 s->band[band].ap[2] = wd3; |
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92 |
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93 /* Block 4, UPPOL1 */ |
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94 s->band[band].sg[0] = s->band[band].p[0] >> 15; |
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95 s->band[band].sg[1] = s->band[band].p[1] >> 15; |
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96 wd1 = (s->band[band].sg[0] == s->band[band].sg[1]) ? 192 : -192; |
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97 wd2 = (s->band[band].a[1]*32640) >> 15; |
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98 |
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99 s->band[band].ap[1] = saturate(wd1 + wd2); |
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100 wd3 = saturate(15360 - s->band[band].ap[2]); |
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101 if (s->band[band].ap[1] > wd3) |
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102 s->band[band].ap[1] = wd3; |
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103 else if (s->band[band].ap[1] < -wd3) |
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104 s->band[band].ap[1] = -wd3; |
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105 |
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106 /* Block 4, UPZERO */ |
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107 wd1 = (d == 0) ? 0 : 128; |
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108 s->band[band].sg[0] = d >> 15; |
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109 for (i = 1; i < 7; i++) |
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110 { |
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111 s->band[band].sg[i] = s->band[band].d[i] >> 15; |
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112 wd2 = (s->band[band].sg[i] == s->band[band].sg[0]) ? wd1 : -wd1; |
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113 wd3 = (s->band[band].b[i]*32640) >> 15; |
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114 s->band[band].bp[i] = saturate(wd2 + wd3); |
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115 } |
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116 |
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117 /* Block 4, DELAYA */ |
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118 for (i = 6; i > 0; i--) |
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119 { |
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120 s->band[band].d[i] = s->band[band].d[i - 1]; |
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121 s->band[band].b[i] = s->band[band].bp[i]; |
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122 } |
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123 |
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124 for (i = 2; i > 0; i--) |
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125 { |
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126 s->band[band].r[i] = s->band[band].r[i - 1]; |
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127 s->band[band].p[i] = s->band[band].p[i - 1]; |
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128 s->band[band].a[i] = s->band[band].ap[i]; |
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129 } |
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130 |
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131 /* Block 4, FILTEP */ |
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132 wd1 = saturate(s->band[band].r[1] + s->band[band].r[1]); |
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133 wd1 = (s->band[band].a[1]*wd1) >> 15; |
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134 wd2 = saturate(s->band[band].r[2] + s->band[band].r[2]); |
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135 wd2 = (s->band[band].a[2]*wd2) >> 15; |
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136 s->band[band].sp = saturate(wd1 + wd2); |
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137 |
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138 /* Block 4, FILTEZ */ |
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139 s->band[band].sz = 0; |
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140 for (i = 6; i > 0; i--) |
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141 { |
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142 wd1 = saturate(s->band[band].d[i] + s->band[band].d[i]); |
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143 s->band[band].sz += (s->band[band].b[i]*wd1) >> 15; |
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144 } |
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145 s->band[band].sz = saturate(s->band[band].sz); |
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146 |
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147 /* Block 4, PREDIC */ |
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148 s->band[band].s = saturate(s->band[band].sp + s->band[band].sz); |
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149 } |
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150 /*- End of function --------------------------------------------------------*/ |
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151 |
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152 g722_encode_state_t *g722_encode_init(g722_encode_state_t *s, int rate, int options) |
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153 { |
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154 if (s == NULL) |
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155 { |
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156 if ((s = (g722_encode_state_t *) malloc(sizeof(*s))) == NULL) |
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157 return NULL; |
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158 } |
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159 memset(s, 0, sizeof(*s)); |
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160 if (rate == 48000) |
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161 s->bits_per_sample = 6; |
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162 else if (rate == 56000) |
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163 s->bits_per_sample = 7; |
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164 else |
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165 s->bits_per_sample = 8; |
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166 if ((options & G722_SAMPLE_RATE_8000)) |
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167 s->eight_k = TRUE; |
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168 if ((options & G722_PACKED) && s->bits_per_sample != 8) |
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169 s->packed = TRUE; |
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170 else |
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171 s->packed = FALSE; |
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172 s->band[0].det = 32; |
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173 s->band[1].det = 8; |
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174 return s; |
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175 } |
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176 /*- End of function --------------------------------------------------------*/ |
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177 |
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178 int g722_encode_release(g722_encode_state_t *s) |
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179 { |
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180 free(s); |
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181 return 0; |
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182 } |
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183 /*- End of function --------------------------------------------------------*/ |
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184 |
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185 int g722_encode(g722_encode_state_t *s, uint8_t g722_data[], const int16_t amp[], int len) |
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186 { |
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187 static const int q6[32] = |
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188 { |
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189 0, 35, 72, 110, 150, 190, 233, 276, |
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190 323, 370, 422, 473, 530, 587, 650, 714, |
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191 786, 858, 940, 1023, 1121, 1219, 1339, 1458, |
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192 1612, 1765, 1980, 2195, 2557, 2919, 0, 0 |
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193 }; |
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194 static const int iln[32] = |
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195 { |
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196 0, 63, 62, 31, 30, 29, 28, 27, |
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197 26, 25, 24, 23, 22, 21, 20, 19, |
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198 18, 17, 16, 15, 14, 13, 12, 11, |
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199 10, 9, 8, 7, 6, 5, 4, 0 |
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200 }; |
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201 static const int ilp[32] = |
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202 { |
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203 0, 61, 60, 59, 58, 57, 56, 55, |
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204 54, 53, 52, 51, 50, 49, 48, 47, |
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205 46, 45, 44, 43, 42, 41, 40, 39, |
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206 38, 37, 36, 35, 34, 33, 32, 0 |
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207 }; |
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208 static const int wl[8] = |
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209 { |
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210 -60, -30, 58, 172, 334, 538, 1198, 3042 |
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211 }; |
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212 static const int rl42[16] = |
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213 { |
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214 0, 7, 6, 5, 4, 3, 2, 1, 7, 6, 5, 4, 3, 2, 1, 0 |
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215 }; |
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216 static const int ilb[32] = |
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217 { |
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218 2048, 2093, 2139, 2186, 2233, 2282, 2332, |
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219 2383, 2435, 2489, 2543, 2599, 2656, 2714, |
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220 2774, 2834, 2896, 2960, 3025, 3091, 3158, |
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221 3228, 3298, 3371, 3444, 3520, 3597, 3676, |
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222 3756, 3838, 3922, 4008 |
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223 }; |
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224 static const int qm4[16] = |
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225 { |
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226 0, -20456, -12896, -8968, |
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227 -6288, -4240, -2584, -1200, |
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228 20456, 12896, 8968, 6288, |
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229 4240, 2584, 1200, 0 |
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230 }; |
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231 static const int qm2[4] = |
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232 { |
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233 -7408, -1616, 7408, 1616 |
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234 }; |
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235 static const int qmf_coeffs[12] = |
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236 { |
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237 3, -11, 12, 32, -210, 951, 3876, -805, 362, -156, 53, -11, |
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238 }; |
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239 static const int ihn[3] = {0, 1, 0}; |
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240 static const int ihp[3] = {0, 3, 2}; |
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241 static const int wh[3] = {0, -214, 798}; |
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242 static const int rh2[4] = {2, 1, 2, 1}; |
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243 |
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244 int dlow; |
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245 int dhigh; |
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246 int el; |
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247 int wd; |
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248 int wd1; |
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249 int ril; |
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250 int wd2; |
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251 int il4; |
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252 int ih2; |
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253 int wd3; |
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254 int eh; |
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255 int mih; |
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256 int i; |
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257 int j; |
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258 /* Low and high band PCM from the QMF */ |
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259 int xlow; |
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260 int xhigh; |
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261 int g722_bytes; |
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262 /* Even and odd tap accumulators */ |
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263 int sumeven; |
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264 int sumodd; |
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265 int ihigh; |
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266 int ilow; |
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267 int code; |
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268 |
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269 g722_bytes = 0; |
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270 xhigh = 0; |
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271 for (j = 0; j < len; ) |
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272 { |
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273 if (s->itu_test_mode) |
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274 { |
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275 xlow = |
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276 xhigh = amp[j++] >> 1; |
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277 } |
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278 else |
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279 { |
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280 if (s->eight_k) |
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281 { |
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282 xlow = amp[j++]; |
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283 } |
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284 else |
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285 { |
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286 /* Apply the transmit QMF */ |
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287 /* Shuffle the buffer down */ |
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288 for (i = 0; i < 22; i++) |
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289 s->x[i] = s->x[i + 2]; |
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290 s->x[22] = amp[j++]; |
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291 s->x[23] = amp[j++]; |
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292 |
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293 /* Discard every other QMF output */ |
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294 sumeven = 0; |
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295 sumodd = 0; |
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296 for (i = 0; i < 12; i++) |
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297 { |
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298 sumodd += s->x[2*i]*qmf_coeffs[i]; |
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299 sumeven += s->x[2*i + 1]*qmf_coeffs[11 - i]; |
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300 } |
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301 xlow = (sumeven + sumodd) >> 13; |
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302 xhigh = (sumeven - sumodd) >> 13; |
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303 } |
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304 } |
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305 /* Block 1L, SUBTRA */ |
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306 el = saturate(xlow - s->band[0].s); |
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307 |
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308 /* Block 1L, QUANTL */ |
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309 wd = (el >= 0) ? el : -(el + 1); |
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310 |
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311 for (i = 1; i < 30; i++) |
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312 { |
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313 wd1 = (q6[i]*s->band[0].det) >> 12; |
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314 if (wd < wd1) |
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315 break; |
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316 } |
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317 ilow = (el < 0) ? iln[i] : ilp[i]; |
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318 |
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319 /* Block 2L, INVQAL */ |
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320 ril = ilow >> 2; |
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321 wd2 = qm4[ril]; |
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322 dlow = (s->band[0].det*wd2) >> 15; |
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323 |
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324 /* Block 3L, LOGSCL */ |
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325 il4 = rl42[ril]; |
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326 wd = (s->band[0].nb*127) >> 7; |
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327 s->band[0].nb = wd + wl[il4]; |
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328 if (s->band[0].nb < 0) |
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329 s->band[0].nb = 0; |
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330 else if (s->band[0].nb > 18432) |
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331 s->band[0].nb = 18432; |
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332 |
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333 /* Block 3L, SCALEL */ |
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334 wd1 = (s->band[0].nb >> 6) & 31; |
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335 wd2 = 8 - (s->band[0].nb >> 11); |
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336 wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2); |
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337 s->band[0].det = wd3 << 2; |
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338 |
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339 block4(s, 0, dlow); |
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340 |
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341 if (s->eight_k) |
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342 { |
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343 /* Just leave the high bits as zero */ |
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344 code = (0xC0 | ilow) >> (8 - s->bits_per_sample); |
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345 } |
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346 else |
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347 { |
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348 /* Block 1H, SUBTRA */ |
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349 eh = saturate(xhigh - s->band[1].s); |
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350 |
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351 /* Block 1H, QUANTH */ |
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352 wd = (eh >= 0) ? eh : -(eh + 1); |
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353 wd1 = (564*s->band[1].det) >> 12; |
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354 mih = (wd >= wd1) ? 2 : 1; |
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355 ihigh = (eh < 0) ? ihn[mih] : ihp[mih]; |
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356 |
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357 /* Block 2H, INVQAH */ |
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358 wd2 = qm2[ihigh]; |
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359 dhigh = (s->band[1].det*wd2) >> 15; |
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360 |
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361 /* Block 3H, LOGSCH */ |
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362 ih2 = rh2[ihigh]; |
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363 wd = (s->band[1].nb*127) >> 7; |
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364 s->band[1].nb = wd + wh[ih2]; |
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365 if (s->band[1].nb < 0) |
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366 s->band[1].nb = 0; |
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367 else if (s->band[1].nb > 22528) |
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368 s->band[1].nb = 22528; |
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369 |
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370 /* Block 3H, SCALEH */ |
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371 wd1 = (s->band[1].nb >> 6) & 31; |
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372 wd2 = 10 - (s->band[1].nb >> 11); |
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373 wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2); |
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374 s->band[1].det = wd3 << 2; |
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375 |
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376 block4(s, 1, dhigh); |
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377 code = ((ihigh << 6) | ilow) >> (8 - s->bits_per_sample); |
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378 } |
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379 |
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380 if (s->packed) |
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381 { |
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382 /* Pack the code bits */ |
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383 s->out_buffer |= (code << s->out_bits); |
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384 s->out_bits += s->bits_per_sample; |
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385 if (s->out_bits >= 8) |
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386 { |
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387 g722_data[g722_bytes++] = (uint8_t) (s->out_buffer & 0xFF); |
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388 s->out_bits -= 8; |
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389 s->out_buffer >>= 8; |
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390 } |
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391 } |
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392 else |
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393 { |
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394 g722_data[g722_bytes++] = (uint8_t) code; |
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395 } |
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396 } |
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397 return g722_bytes; |
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398 } |
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399 /*- End of function --------------------------------------------------------*/ |
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400 /*- End of file ------------------------------------------------------------*/ |