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2 /******************************************************************
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3
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4 iLBC Speech Coder ANSI-C Source Code
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5
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6 iLBC_encode.c
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7
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8 Copyright (C) The Internet Society (2004).
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9 All Rights Reserved.
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10
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11 ******************************************************************/
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12
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13 #include <math.h>
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14 #include <stdlib.h>
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15 #include <string.h>
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16
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17 #include "iLBC_define.h"
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18 #include "LPCencode.h"
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19 #include "FrameClassify.h"
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20 #include "StateSearchW.h"
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21 #include "StateConstructW.h"
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22 #include "helpfun.h"
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23 #include "constants.h"
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24 #include "packing.h"
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25 #include "iCBSearch.h"
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26 #include "iCBConstruct.h"
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27 #include "hpInput.h"
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28 #include "anaFilter.h"
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29 #include "syntFilter.h"
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30
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31 /*----------------------------------------------------------------*
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32 * Initiation of encoder instance.
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33 *---------------------------------------------------------------*/
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34
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35 short initEncode( /* (o) Number of bytes
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36 encoded */
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37 iLBC_Enc_Inst_t * iLBCenc_inst, /* (i/o) Encoder instance */
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38 int mode /* (i) frame size mode */
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39 )
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40 {
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41 iLBCenc_inst->mode = mode;
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42 if (mode == 30) {
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43 iLBCenc_inst->blockl = BLOCKL_30MS;
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44 iLBCenc_inst->nsub = NSUB_30MS;
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45 iLBCenc_inst->nasub = NASUB_30MS;
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46 iLBCenc_inst->lpc_n = LPC_N_30MS;
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47 iLBCenc_inst->no_of_bytes = NO_OF_BYTES_30MS;
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48 iLBCenc_inst->no_of_words = NO_OF_WORDS_30MS;
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49
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50
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51
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52
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53
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54 iLBCenc_inst->state_short_len = STATE_SHORT_LEN_30MS;
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55 /* ULP init */
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56 iLBCenc_inst->ULP_inst = &ULP_30msTbl;
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57 } else if (mode == 20) {
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58 iLBCenc_inst->blockl = BLOCKL_20MS;
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59 iLBCenc_inst->nsub = NSUB_20MS;
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60 iLBCenc_inst->nasub = NASUB_20MS;
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61 iLBCenc_inst->lpc_n = LPC_N_20MS;
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62 iLBCenc_inst->no_of_bytes = NO_OF_BYTES_20MS;
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63 iLBCenc_inst->no_of_words = NO_OF_WORDS_20MS;
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64 iLBCenc_inst->state_short_len = STATE_SHORT_LEN_20MS;
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65 /* ULP init */
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66 iLBCenc_inst->ULP_inst = &ULP_20msTbl;
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67 } else {
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68 exit(2);
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69 }
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70
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71 memset((*iLBCenc_inst).anaMem, 0, LPC_FILTERORDER * sizeof(float));
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72 memcpy((*iLBCenc_inst).lsfold, lsfmeanTbl,
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73 LPC_FILTERORDER * sizeof(float));
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74 memcpy((*iLBCenc_inst).lsfdeqold, lsfmeanTbl,
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75 LPC_FILTERORDER * sizeof(float));
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76 memset((*iLBCenc_inst).lpc_buffer, 0,
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77 (LPC_LOOKBACK + BLOCKL_MAX) * sizeof(float));
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78 memset((*iLBCenc_inst).hpimem, 0, 4 * sizeof(float));
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79
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80 return (iLBCenc_inst->no_of_bytes);
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81 }
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82
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83 /*----------------------------------------------------------------*
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84 * main encoder function
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85 *---------------------------------------------------------------*/
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86
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87 void iLBC_encode(unsigned char *bytes, /* (o) encoded data bits iLBC */
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88 float *block, /* (o) speech vector to
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89 encode */
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90 iLBC_Enc_Inst_t * iLBCenc_inst /* (i/o) the general encoder
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91 state */
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92 )
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93 {
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94
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95 float data[BLOCKL_MAX];
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96 float residual[BLOCKL_MAX], reverseResidual[BLOCKL_MAX];
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97
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98 int start, idxForMax, idxVec[STATE_LEN];
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99
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100
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101
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102
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103
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104 float reverseDecresidual[BLOCKL_MAX], mem[CB_MEML];
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105 int n, k, meml_gotten, Nfor, Nback, i, pos;
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106 int gain_index[CB_NSTAGES * NASUB_MAX], extra_gain_index[CB_NSTAGES];
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107 int cb_index[CB_NSTAGES * NASUB_MAX], extra_cb_index[CB_NSTAGES];
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108 int lsf_i[LSF_NSPLIT * LPC_N_MAX];
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109 unsigned char *pbytes;
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110 int diff, start_pos, state_first;
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111 float en1, en2;
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112 int index, ulp, firstpart;
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113 int subcount, subframe;
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114 float weightState[LPC_FILTERORDER];
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115 float syntdenum[NSUB_MAX * (LPC_FILTERORDER + 1)];
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116 float weightdenum[NSUB_MAX * (LPC_FILTERORDER + 1)];
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117 float decresidual[BLOCKL_MAX];
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118
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119 /* high pass filtering of input signal if such is not done
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120 prior to calling this function */
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121
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122 hpInput(block, iLBCenc_inst->blockl, data, (*iLBCenc_inst).hpimem);
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123
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124 /* otherwise simply copy */
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125
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126 /*memcpy(data,block,iLBCenc_inst->blockl*sizeof(float)); */
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127
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128 /* LPC of hp filtered input data */
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129
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130 LPCencode(syntdenum, weightdenum, lsf_i, data, iLBCenc_inst);
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131
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132
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133 /* inverse filter to get residual */
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134
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135 for (n = 0; n < iLBCenc_inst->nsub; n++) {
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136 anaFilter(&data[n * SUBL], &syntdenum[n * (LPC_FILTERORDER + 1)],
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137 SUBL, &residual[n * SUBL], iLBCenc_inst->anaMem);
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138 }
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139
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140 /* find state location */
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141
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142 start = FrameClassify(iLBCenc_inst, residual);
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143
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144 /* check if state should be in first or last part of the
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145 two subframes */
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146
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147 diff = STATE_LEN - iLBCenc_inst->state_short_len;
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148 en1 = 0;
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149 index = (start - 1) * SUBL;
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150
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151
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152
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153
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154
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155 for (i = 0; i < iLBCenc_inst->state_short_len; i++) {
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156 en1 += residual[index + i] * residual[index + i];
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157 }
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158 en2 = 0;
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159 index = (start - 1) * SUBL + diff;
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160 for (i = 0; i < iLBCenc_inst->state_short_len; i++) {
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161 en2 += residual[index + i] * residual[index + i];
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162 }
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163
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164
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165 if (en1 > en2) {
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166 state_first = 1;
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167 start_pos = (start - 1) * SUBL;
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168 } else {
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169 state_first = 0;
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170 start_pos = (start - 1) * SUBL + diff;
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171 }
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172
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173 /* scalar quantization of state */
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174
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175 StateSearchW(iLBCenc_inst, &residual[start_pos],
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176 &syntdenum[(start - 1) * (LPC_FILTERORDER + 1)],
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177 &weightdenum[(start - 1) * (LPC_FILTERORDER + 1)], &idxForMax,
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178 idxVec, iLBCenc_inst->state_short_len, state_first);
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179
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180 StateConstructW(idxForMax, idxVec,
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181 &syntdenum[(start - 1) * (LPC_FILTERORDER + 1)],
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182 &decresidual[start_pos], iLBCenc_inst->state_short_len);
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183
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184 /* predictive quantization in state */
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185
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186 if (state_first) { /* put adaptive part in the end */
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187
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188 /* setup memory */
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189
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190 memset(mem, 0,
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191 (CB_MEML - iLBCenc_inst->state_short_len) * sizeof(float));
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192 memcpy(mem + CB_MEML - iLBCenc_inst->state_short_len,
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193 decresidual + start_pos,
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194 iLBCenc_inst->state_short_len * sizeof(float));
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195 memset(weightState, 0, LPC_FILTERORDER * sizeof(float));
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196
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197 /* encode sub-frames */
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198
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199 iCBSearch(iLBCenc_inst, extra_cb_index, extra_gain_index,
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200 &residual[start_pos + iLBCenc_inst->state_short_len],
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201 mem + CB_MEML - stMemLTbl,
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202 stMemLTbl, diff, CB_NSTAGES,
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203 &weightdenum[start * (LPC_FILTERORDER + 1)], weightState, 0);
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204
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205 /* construct decoded vector */
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206
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207 iCBConstruct(&decresidual[start_pos +
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208 iLBCenc_inst->state_short_len], extra_cb_index,
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209 extra_gain_index, mem + CB_MEML - stMemLTbl, stMemLTbl, diff,
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210 CB_NSTAGES);
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211
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212 } else { /* put adaptive part in the beginning */
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213
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214 /* create reversed vectors for prediction */
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215
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216 for (k = 0; k < diff; k++) {
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217 reverseResidual[k] = residual[(start + 1) * SUBL - 1
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218 - (k + iLBCenc_inst->state_short_len)];
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219 }
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220
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221 /* setup memory */
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222
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223 meml_gotten = iLBCenc_inst->state_short_len;
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224 for (k = 0; k < meml_gotten; k++) {
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225 mem[CB_MEML - 1 - k] = decresidual[start_pos + k];
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226 }
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227 memset(mem, 0, (CB_MEML - k) * sizeof(float));
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228 memset(weightState, 0, LPC_FILTERORDER * sizeof(float));
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229
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230 /* encode sub-frames */
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231
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232 iCBSearch(iLBCenc_inst, extra_cb_index, extra_gain_index,
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233 reverseResidual, mem + CB_MEML - stMemLTbl, stMemLTbl,
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234 diff, CB_NSTAGES,
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235 &weightdenum[(start - 1) * (LPC_FILTERORDER + 1)],
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236 weightState, 0);
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237
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238 /* construct decoded vector */
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239
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240 iCBConstruct(reverseDecresidual, extra_cb_index,
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241 extra_gain_index, mem + CB_MEML - stMemLTbl, stMemLTbl,
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242 diff, CB_NSTAGES);
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243
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244 /* get decoded residual from reversed vector */
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245
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246 for (k = 0; k < diff; k++) {
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247 decresidual[start_pos - 1 - k] = reverseDecresidual[k];
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248
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249
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250
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251
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252
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253 }
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254 }
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255
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256 /* counter for predicted sub-frames */
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257
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258 subcount = 0;
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259
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260 /* forward prediction of sub-frames */
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261
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262 Nfor = iLBCenc_inst->nsub - start - 1;
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263
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264
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265 if (Nfor > 0) {
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266
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267 /* setup memory */
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268
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269 memset(mem, 0, (CB_MEML - STATE_LEN) * sizeof(float));
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270 memcpy(mem + CB_MEML - STATE_LEN, decresidual + (start - 1) * SUBL,
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271 STATE_LEN * sizeof(float));
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272 memset(weightState, 0, LPC_FILTERORDER * sizeof(float));
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273
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274 /* loop over sub-frames to encode */
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275
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276 for (subframe = 0; subframe < Nfor; subframe++) {
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277
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278 /* encode sub-frame */
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279
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280 iCBSearch(iLBCenc_inst, cb_index + subcount * CB_NSTAGES,
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281 gain_index + subcount * CB_NSTAGES,
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282 &residual[(start + 1 + subframe) * SUBL],
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283 mem + CB_MEML - memLfTbl[subcount],
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284 memLfTbl[subcount], SUBL, CB_NSTAGES,
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285 &weightdenum[(start + 1 + subframe) *
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286 (LPC_FILTERORDER + 1)], weightState, subcount + 1);
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287
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288 /* construct decoded vector */
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289
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290 iCBConstruct(&decresidual[(start + 1 + subframe) * SUBL],
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291 cb_index + subcount * CB_NSTAGES,
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292 gain_index + subcount * CB_NSTAGES,
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293 mem + CB_MEML - memLfTbl[subcount],
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294 memLfTbl[subcount], SUBL, CB_NSTAGES);
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295
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296 /* update memory */
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297
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298 memcpy(mem, mem + SUBL, (CB_MEML - SUBL) * sizeof(float));
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299 memcpy(mem + CB_MEML - SUBL,
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300 &decresidual[(start + 1 + subframe) * SUBL],
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301 SUBL * sizeof(float));
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302 memset(weightState, 0, LPC_FILTERORDER * sizeof(float));
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303
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304 subcount++;
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305 }
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306 }
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307
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308
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309 /* backward prediction of sub-frames */
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310
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311 Nback = start - 1;
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312
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313
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314 if (Nback > 0) {
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315
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316 /* create reverse order vectors */
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317
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318 for (n = 0; n < Nback; n++) {
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319 for (k = 0; k < SUBL; k++) {
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320 reverseResidual[n * SUBL + k] =
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321 residual[(start - 1) * SUBL - 1 - n * SUBL - k];
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322 reverseDecresidual[n * SUBL + k] =
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323 decresidual[(start - 1) * SUBL - 1 - n * SUBL - k];
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324 }
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325 }
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326
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327 /* setup memory */
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328
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329 meml_gotten = SUBL * (iLBCenc_inst->nsub + 1 - start);
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330
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331
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332 if (meml_gotten > CB_MEML) {
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333 meml_gotten = CB_MEML;
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334 }
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335 for (k = 0; k < meml_gotten; k++) {
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336 mem[CB_MEML - 1 - k] = decresidual[(start - 1) * SUBL + k];
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337 }
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338 memset(mem, 0, (CB_MEML - k) * sizeof(float));
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339 memset(weightState, 0, LPC_FILTERORDER * sizeof(float));
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340
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341 /* loop over sub-frames to encode */
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342
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343 for (subframe = 0; subframe < Nback; subframe++) {
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344
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345 /* encode sub-frame */
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346
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347 iCBSearch(iLBCenc_inst, cb_index + subcount * CB_NSTAGES,
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348 gain_index + subcount * CB_NSTAGES,
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349 &reverseResidual[subframe * SUBL],
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350 mem + CB_MEML - memLfTbl[subcount],
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351 memLfTbl[subcount], SUBL, CB_NSTAGES,
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352 &weightdenum[(start - 2 - subframe) *
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353 (LPC_FILTERORDER + 1)], weightState, subcount + 1);
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354
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355 /* construct decoded vector */
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356
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357 iCBConstruct(&reverseDecresidual[subframe * SUBL],
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358 cb_index + subcount * CB_NSTAGES,
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359 gain_index + subcount * CB_NSTAGES,
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360 mem + CB_MEML - memLfTbl[subcount],
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361 memLfTbl[subcount], SUBL, CB_NSTAGES);
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362
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363 /* update memory */
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364
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365 memcpy(mem, mem + SUBL, (CB_MEML - SUBL) * sizeof(float));
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366 memcpy(mem + CB_MEML - SUBL,
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367 &reverseDecresidual[subframe * SUBL], SUBL * sizeof(float));
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368 memset(weightState, 0, LPC_FILTERORDER * sizeof(float));
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369
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370 subcount++;
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371
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372 }
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373
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374 /* get decoded residual from reversed vector */
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375
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376 for (i = 0; i < SUBL * Nback; i++) {
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377 decresidual[SUBL * Nback - i - 1] = reverseDecresidual[i];
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378 }
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379 }
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380 /* end encoding part */
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381
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382 /* adjust index */
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383 index_conv_enc(cb_index);
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384
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385 /* pack bytes */
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386
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387 pbytes = bytes;
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388 pos = 0;
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389
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390 /* loop over the 3 ULP classes */
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391
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392 for (ulp = 0; ulp < 3; ulp++) {
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393
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394
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395
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396
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397
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398
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399 /* LSF */
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400 for (k = 0; k < LSF_NSPLIT * iLBCenc_inst->lpc_n; k++) {
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401 packsplit(&lsf_i[k], &firstpart, &lsf_i[k],
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402 iLBCenc_inst->ULP_inst->lsf_bits[k][ulp],
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403 iLBCenc_inst->ULP_inst->lsf_bits[k][ulp] +
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404 iLBCenc_inst->ULP_inst->lsf_bits[k][ulp + 1] +
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405 iLBCenc_inst->ULP_inst->lsf_bits[k][ulp + 2]);
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406 dopack(&pbytes, firstpart,
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407 iLBCenc_inst->ULP_inst->lsf_bits[k][ulp], &pos);
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408 }
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409
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410 /* Start block info */
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411
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412 packsplit(&start, &firstpart, &start,
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413 iLBCenc_inst->ULP_inst->start_bits[ulp],
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414 iLBCenc_inst->ULP_inst->start_bits[ulp] +
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415 iLBCenc_inst->ULP_inst->start_bits[ulp + 1] +
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416 iLBCenc_inst->ULP_inst->start_bits[ulp + 2]);
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417 dopack(&pbytes, firstpart,
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418 iLBCenc_inst->ULP_inst->start_bits[ulp], &pos);
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419
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420 packsplit(&state_first, &firstpart, &state_first,
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421 iLBCenc_inst->ULP_inst->startfirst_bits[ulp],
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422 iLBCenc_inst->ULP_inst->startfirst_bits[ulp] +
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423 iLBCenc_inst->ULP_inst->startfirst_bits[ulp + 1] +
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424 iLBCenc_inst->ULP_inst->startfirst_bits[ulp + 2]);
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425 dopack(&pbytes, firstpart,
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426 iLBCenc_inst->ULP_inst->startfirst_bits[ulp], &pos);
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427
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428 packsplit(&idxForMax, &firstpart, &idxForMax,
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429 iLBCenc_inst->ULP_inst->scale_bits[ulp],
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430 iLBCenc_inst->ULP_inst->scale_bits[ulp] +
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431 iLBCenc_inst->ULP_inst->scale_bits[ulp + 1] +
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432 iLBCenc_inst->ULP_inst->scale_bits[ulp + 2]);
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433 dopack(&pbytes, firstpart,
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434 iLBCenc_inst->ULP_inst->scale_bits[ulp], &pos);
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435
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436 for (k = 0; k < iLBCenc_inst->state_short_len; k++) {
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437 packsplit(idxVec + k, &firstpart, idxVec + k,
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438 iLBCenc_inst->ULP_inst->state_bits[ulp],
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439 iLBCenc_inst->ULP_inst->state_bits[ulp] +
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440 iLBCenc_inst->ULP_inst->state_bits[ulp + 1] +
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441 iLBCenc_inst->ULP_inst->state_bits[ulp + 2]);
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442 dopack(&pbytes, firstpart,
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443 iLBCenc_inst->ULP_inst->state_bits[ulp], &pos);
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444 }
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445
|
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446
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447
|
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448
|
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449
|
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450
|
|
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451 /* 23/22 (20ms/30ms) sample block */
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452
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453 for (k = 0; k < CB_NSTAGES; k++) {
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454 packsplit(extra_cb_index + k, &firstpart,
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455 extra_cb_index + k,
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456 iLBCenc_inst->ULP_inst->extra_cb_index[k][ulp],
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457 iLBCenc_inst->ULP_inst->extra_cb_index[k][ulp] +
|
|
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458 iLBCenc_inst->ULP_inst->extra_cb_index[k][ulp + 1] +
|
|
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459 iLBCenc_inst->ULP_inst->extra_cb_index[k][ulp + 2]);
|
|
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460 dopack(&pbytes, firstpart,
|
|
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461 iLBCenc_inst->ULP_inst->extra_cb_index[k][ulp], &pos);
|
|
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462 }
|
|
|
463
|
|
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464 for (k = 0; k < CB_NSTAGES; k++) {
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|
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465 packsplit(extra_gain_index + k, &firstpart,
|
|
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466 extra_gain_index + k,
|
|
|
467 iLBCenc_inst->ULP_inst->extra_cb_gain[k][ulp],
|
|
|
468 iLBCenc_inst->ULP_inst->extra_cb_gain[k][ulp] +
|
|
|
469 iLBCenc_inst->ULP_inst->extra_cb_gain[k][ulp + 1] +
|
|
|
470 iLBCenc_inst->ULP_inst->extra_cb_gain[k][ulp + 2]);
|
|
|
471 dopack(&pbytes, firstpart,
|
|
|
472 iLBCenc_inst->ULP_inst->extra_cb_gain[k][ulp], &pos);
|
|
|
473 }
|
|
|
474
|
|
|
475 /* The two/four (20ms/30ms) 40 sample sub-blocks */
|
|
|
476
|
|
|
477 for (i = 0; i < iLBCenc_inst->nasub; i++) {
|
|
|
478 for (k = 0; k < CB_NSTAGES; k++) {
|
|
|
479 packsplit(cb_index + i * CB_NSTAGES + k, &firstpart,
|
|
|
480 cb_index + i * CB_NSTAGES + k,
|
|
|
481 iLBCenc_inst->ULP_inst->cb_index[i][k][ulp],
|
|
|
482 iLBCenc_inst->ULP_inst->cb_index[i][k][ulp] +
|
|
|
483 iLBCenc_inst->ULP_inst->cb_index[i][k][ulp + 1] +
|
|
|
484 iLBCenc_inst->ULP_inst->cb_index[i][k][ulp + 2]);
|
|
|
485 dopack(&pbytes, firstpart,
|
|
|
486 iLBCenc_inst->ULP_inst->cb_index[i][k][ulp], &pos);
|
|
|
487 }
|
|
|
488 }
|
|
|
489
|
|
|
490 for (i = 0; i < iLBCenc_inst->nasub; i++) {
|
|
|
491 for (k = 0; k < CB_NSTAGES; k++) {
|
|
|
492 packsplit(gain_index + i * CB_NSTAGES + k, &firstpart,
|
|
|
493 gain_index + i * CB_NSTAGES + k,
|
|
|
494 iLBCenc_inst->ULP_inst->cb_gain[i][k][ulp],
|
|
|
495 iLBCenc_inst->ULP_inst->cb_gain[i][k][ulp] +
|
|
|
496 iLBCenc_inst->ULP_inst->cb_gain[i][k][ulp + 1] +
|
|
|
497 iLBCenc_inst->ULP_inst->cb_gain[i][k][ulp + 2]);
|
|
|
498 dopack(&pbytes, firstpart,
|
|
|
499 iLBCenc_inst->ULP_inst->cb_gain[i][k][ulp], &pos);
|
|
|
500 }
|
|
|
501 }
|
|
|
502 }
|
|
|
503
|
|
|
504 /* set the last bit to zero (otherwise the decoder
|
|
|
505 will treat it as a lost frame) */
|
|
|
506 dopack(&pbytes, 0, 1, &pos);
|
|
|
507 }
|
