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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 * Despite my general liking of the GPL, I place my own contributions |
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11 * to this code in the public domain for the benefit of all mankind - |
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12 * even the slimy ones who might try to proprietize my work and use it |
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13 * to my detriment. |
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14 * |
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15 * Based in part on a single channel G.722 codec which is: |
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16 * |
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17 * Copyright (c) CMU 1993 |
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18 * Computer Science, Speech Group |
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19 * Chengxiang Lu and Alex Hauptmann |
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20 * |
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21 * $Id: g722_decode.c 48661 2006-12-21 00:08:21Z mattf $ |
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22 */ |
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23 |
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24 /*! \file */ |
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25 |
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26 #ifdef HAVE_CONFIG_H |
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27 #include <config.h> |
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28 #endif |
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29 |
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30 #include <stdio.h> |
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31 //#include <inttypes.h> |
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32 #include <memory.h> |
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33 #include <stdlib.h> |
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34 #if 0 |
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35 #include <tgmath.h> |
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36 #endif |
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37 |
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38 #include "g722.h" |
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39 |
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40 #if !defined(FALSE) |
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41 #define FALSE 0 |
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42 #endif |
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43 #if !defined(TRUE) |
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44 #define TRUE (!FALSE) |
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45 #endif |
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46 |
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47 static int16_t saturate(int32_t amp) |
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48 { |
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49 int16_t amp16; |
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50 |
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51 /* Hopefully this is optimised for the common case - not clipping */ |
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52 amp16 = (int16_t) amp; |
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53 if (amp == amp16) |
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54 return amp16; |
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55 if (amp > INT16_MAX) |
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56 return INT16_MAX; |
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57 return INT16_MIN; |
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58 } |
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59 /*- End of function --------------------------------------------------------*/ |
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60 |
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61 static void block4(g722_decode_state_t *s, int band, int d); |
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62 |
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63 static void block4(g722_decode_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 = (s->band[band].sg[0] == s->band[band].sg[2]) ? 128 : -128; |
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86 wd3 += (wd2 >> 7); |
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87 wd3 += (s->band[band].a[2]*32512) >> 15; |
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88 if (wd3 > 12288) |
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89 wd3 = 12288; |
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90 else if (wd3 < -12288) |
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91 wd3 = -12288; |
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92 s->band[band].ap[2] = wd3; |
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93 |
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94 /* Block 4, UPPOL1 */ |
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95 s->band[band].sg[0] = s->band[band].p[0] >> 15; |
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96 s->band[band].sg[1] = s->band[band].p[1] >> 15; |
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97 wd1 = (s->band[band].sg[0] == s->band[band].sg[1]) ? 192 : -192; |
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98 wd2 = (s->band[band].a[1]*32640) >> 15; |
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99 |
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100 s->band[band].ap[1] = saturate(wd1 + wd2); |
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101 wd3 = saturate(15360 - s->band[band].ap[2]); |
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102 if (s->band[band].ap[1] > wd3) |
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103 s->band[band].ap[1] = wd3; |
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104 else if (s->band[band].ap[1] < -wd3) |
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105 s->band[band].ap[1] = -wd3; |
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106 |
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107 /* Block 4, UPZERO */ |
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108 wd1 = (d == 0) ? 0 : 128; |
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109 s->band[band].sg[0] = d >> 15; |
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110 for (i = 1; i < 7; i++) |
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111 { |
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112 s->band[band].sg[i] = s->band[band].d[i] >> 15; |
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113 wd2 = (s->band[band].sg[i] == s->band[band].sg[0]) ? wd1 : -wd1; |
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114 wd3 = (s->band[band].b[i]*32640) >> 15; |
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115 s->band[band].bp[i] = saturate(wd2 + wd3); |
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116 } |
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117 |
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118 /* Block 4, DELAYA */ |
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119 for (i = 6; i > 0; i--) |
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120 { |
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121 s->band[band].d[i] = s->band[band].d[i - 1]; |
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122 s->band[band].b[i] = s->band[band].bp[i]; |
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123 } |
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124 |
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125 for (i = 2; i > 0; i--) |
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126 { |
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127 s->band[band].r[i] = s->band[band].r[i - 1]; |
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128 s->band[band].p[i] = s->band[band].p[i - 1]; |
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129 s->band[band].a[i] = s->band[band].ap[i]; |
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130 } |
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131 |
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132 /* Block 4, FILTEP */ |
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133 wd1 = saturate(s->band[band].r[1] + s->band[band].r[1]); |
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134 wd1 = (s->band[band].a[1]*wd1) >> 15; |
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135 wd2 = saturate(s->band[band].r[2] + s->band[band].r[2]); |
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136 wd2 = (s->band[band].a[2]*wd2) >> 15; |
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137 s->band[band].sp = saturate(wd1 + wd2); |
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138 |
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139 /* Block 4, FILTEZ */ |
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140 s->band[band].sz = 0; |
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141 for (i = 6; i > 0; i--) |
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142 { |
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143 wd1 = saturate(s->band[band].d[i] + s->band[band].d[i]); |
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144 s->band[band].sz += (s->band[band].b[i]*wd1) >> 15; |
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145 } |
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146 s->band[band].sz = saturate(s->band[band].sz); |
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147 |
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148 /* Block 4, PREDIC */ |
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149 s->band[band].s = saturate(s->band[band].sp + s->band[band].sz); |
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150 } |
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151 /*- End of function --------------------------------------------------------*/ |
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152 |
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153 g722_decode_state_t *g722_decode_init(g722_decode_state_t *s, int rate, int options) |
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154 { |
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155 if (s == NULL) |
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156 { |
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157 if ((s = (g722_decode_state_t *) malloc(sizeof(*s))) == NULL) |
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158 return NULL; |
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159 } |
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160 memset(s, 0, sizeof(*s)); |
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161 if (rate == 48000) |
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162 s->bits_per_sample = 6; |
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163 else if (rate == 56000) |
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164 s->bits_per_sample = 7; |
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165 else |
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166 s->bits_per_sample = 8; |
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167 if ((options & G722_SAMPLE_RATE_8000)) |
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168 s->eight_k = TRUE; |
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169 if ((options & G722_PACKED) && s->bits_per_sample != 8) |
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170 s->packed = TRUE; |
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171 else |
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172 s->packed = FALSE; |
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173 s->band[0].det = 32; |
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174 s->band[1].det = 8; |
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175 return s; |
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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_release(g722_decode_state_t *s) |
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180 { |
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181 free(s); |
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182 return 0; |
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183 } |
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184 /*- End of function --------------------------------------------------------*/ |
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185 |
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186 int g722_decode(g722_decode_state_t *s, int16_t amp[], const uint8_t g722_data[], int len) |
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187 { |
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188 static const int wl[8] = {-60, -30, 58, 172, 334, 538, 1198, 3042 }; |
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189 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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190 static const int ilb[32] = |
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191 { |
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192 2048, 2093, 2139, 2186, 2233, 2282, 2332, |
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193 2383, 2435, 2489, 2543, 2599, 2656, 2714, |
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194 2774, 2834, 2896, 2960, 3025, 3091, 3158, |
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195 3228, 3298, 3371, 3444, 3520, 3597, 3676, |
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196 3756, 3838, 3922, 4008 |
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197 }; |
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198 static const int wh[3] = {0, -214, 798}; |
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199 static const int rh2[4] = {2, 1, 2, 1}; |
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200 static const int qm2[4] = {-7408, -1616, 7408, 1616}; |
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201 static const int qm4[16] = |
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202 { |
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203 0, -20456, -12896, -8968, |
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204 -6288, -4240, -2584, -1200, |
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205 20456, 12896, 8968, 6288, |
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206 4240, 2584, 1200, 0 |
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207 }; |
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208 static const int qm5[32] = |
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209 { |
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210 -280, -280, -23352, -17560, |
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211 -14120, -11664, -9752, -8184, |
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212 -6864, -5712, -4696, -3784, |
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213 -2960, -2208, -1520, -880, |
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214 23352, 17560, 14120, 11664, |
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215 9752, 8184, 6864, 5712, |
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216 4696, 3784, 2960, 2208, |
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217 1520, 880, 280, -280 |
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218 }; |
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219 static const int qm6[64] = |
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220 { |
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221 -136, -136, -136, -136, |
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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 24808, 21904, 19008, 16704, |
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230 14984, 13512, 12280, 11192, |
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231 10232, 9360, 8576, 7856, |
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232 7192, 6576, 6000, 5456, |
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233 4944, 4464, 4008, 3576, |
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234 3168, 2776, 2400, 2032, |
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235 1688, 1360, 1040, 728, |
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236 432, 136, -432, -136 |
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237 }; |
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238 static const int qmf_coeffs[12] = |
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239 { |
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240 3, -11, 12, 32, -210, 951, 3876, -805, 362, -156, 53, -11, |
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241 }; |
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242 |
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243 int dlowt; |
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244 int rlow; |
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245 int ihigh; |
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246 int dhigh; |
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247 int rhigh; |
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248 int xout1; |
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249 int xout2; |
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250 int wd1; |
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251 int wd2; |
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252 int wd3; |
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253 int code; |
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254 int outlen; |
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255 int i; |
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256 int j; |
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257 |
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258 outlen = 0; |
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259 rhigh = 0; |
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260 for (j = 0; j < len; ) |
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261 { |
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262 if (s->packed) |
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263 { |
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264 /* Unpack the code bits */ |
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265 if (s->in_bits < s->bits_per_sample) |
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266 { |
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267 s->in_buffer |= (g722_data[j++] << s->in_bits); |
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268 s->in_bits += 8; |
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269 } |
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270 code = s->in_buffer & ((1 << s->bits_per_sample) - 1); |
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271 s->in_buffer >>= s->bits_per_sample; |
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272 s->in_bits -= s->bits_per_sample; |
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273 } |
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274 else |
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275 { |
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276 code = g722_data[j++]; |
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277 } |
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278 |
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279 switch (s->bits_per_sample) |
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280 { |
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281 default: |
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282 case 8: |
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283 wd1 = code & 0x3F; |
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284 ihigh = (code >> 6) & 0x03; |
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285 wd2 = qm6[wd1]; |
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286 wd1 >>= 2; |
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287 break; |
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288 case 7: |
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289 wd1 = code & 0x1F; |
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290 ihigh = (code >> 5) & 0x03; |
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291 wd2 = qm5[wd1]; |
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292 wd1 >>= 1; |
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293 break; |
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294 case 6: |
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295 wd1 = code & 0x0F; |
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296 ihigh = (code >> 4) & 0x03; |
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297 wd2 = qm4[wd1]; |
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298 break; |
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299 } |
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300 /* Block 5L, LOW BAND INVQBL */ |
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301 wd2 = (s->band[0].det*wd2) >> 15; |
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302 /* Block 5L, RECONS */ |
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303 rlow = s->band[0].s + wd2; |
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304 /* Block 6L, LIMIT */ |
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305 if (rlow > 16383) |
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306 rlow = 16383; |
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307 else if (rlow < -16384) |
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308 rlow = -16384; |
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309 |
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310 /* Block 2L, INVQAL */ |
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311 wd2 = qm4[wd1]; |
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312 dlowt = (s->band[0].det*wd2) >> 15; |
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313 |
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314 /* Block 3L, LOGSCL */ |
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315 wd2 = rl42[wd1]; |
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316 wd1 = (s->band[0].nb*127) >> 7; |
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317 wd1 += wl[wd2]; |
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318 if (wd1 < 0) |
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319 wd1 = 0; |
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320 else if (wd1 > 18432) |
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321 wd1 = 18432; |
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322 s->band[0].nb = wd1; |
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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, dlowt); |
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331 |
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332 if (!s->eight_k) |
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333 { |
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334 /* Block 2H, INVQAH */ |
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335 wd2 = qm2[ihigh]; |
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336 dhigh = (s->band[1].det*wd2) >> 15; |
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337 /* Block 5H, RECONS */ |
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338 rhigh = dhigh + s->band[1].s; |
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339 /* Block 6H, LIMIT */ |
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340 if (rhigh > 16383) |
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341 rhigh = 16383; |
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342 else if (rhigh < -16384) |
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343 rhigh = -16384; |
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344 |
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345 /* Block 2H, INVQAH */ |
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346 wd2 = rh2[ihigh]; |
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347 wd1 = (s->band[1].nb*127) >> 7; |
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348 wd1 += wh[wd2]; |
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349 if (wd1 < 0) |
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350 wd1 = 0; |
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351 else if (wd1 > 22528) |
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352 wd1 = 22528; |
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353 s->band[1].nb = wd1; |
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354 |
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355 /* Block 3H, SCALEH */ |
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356 wd1 = (s->band[1].nb >> 6) & 31; |
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357 wd2 = 10 - (s->band[1].nb >> 11); |
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358 wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2); |
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359 s->band[1].det = wd3 << 2; |
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360 |
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361 block4(s, 1, dhigh); |
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362 } |
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363 |
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364 if (s->itu_test_mode) |
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365 { |
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366 amp[outlen++] = (int16_t) (rlow << 1); |
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367 amp[outlen++] = (int16_t) (rhigh << 1); |
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368 } |
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369 else |
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370 { |
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371 if (s->eight_k) |
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372 { |
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373 amp[outlen++] = (int16_t) rlow; |
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374 } |
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375 else |
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376 { |
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377 /* Apply the receive QMF */ |
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378 for (i = 0; i < 22; i++) |
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379 s->x[i] = s->x[i + 2]; |
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380 s->x[22] = rlow + rhigh; |
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381 s->x[23] = rlow - rhigh; |
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382 |
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383 xout1 = 0; |
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384 xout2 = 0; |
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385 for (i = 0; i < 12; i++) |
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386 { |
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387 xout2 += s->x[2*i]*qmf_coeffs[i]; |
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388 xout1 += s->x[2*i + 1]*qmf_coeffs[11 - i]; |
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389 } |
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390 amp[outlen++] = (int16_t) (xout1 >> 12); |
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391 amp[outlen++] = (int16_t) (xout2 >> 12); |
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392 } |
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393 } |
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394 } |
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395 return outlen; |
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396 } |
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397 /*- End of function --------------------------------------------------------*/ |
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398 /*- End of file ------------------------------------------------------------*/ |