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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_define.h
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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 #include <string.h>
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13
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14 #ifndef __iLBC_ILBCDEFINE_H
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15 #define __iLBC_ILBCDEFINE_H
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16
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17 /* general codec settings */
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18
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19 #define FS (float)8000.0
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20 #define BLOCKL_20MS 160
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21 #define BLOCKL_30MS 240
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22 #define BLOCKL_MAX 240
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23 #define NSUB_20MS 4
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24 #define NSUB_30MS 6
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25 #define NSUB_MAX 6
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26 #define NASUB_20MS 2
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27
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28
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29
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30
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31
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32 #define NASUB_30MS 4
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33 #define NASUB_MAX 4
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34 #define SUBL 40
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35 #define STATE_LEN 80
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36 #define STATE_SHORT_LEN_30MS 58
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37 #define STATE_SHORT_LEN_20MS 57
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38
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39 /* LPC settings */
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40
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41 #define LPC_FILTERORDER 10
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42 #define LPC_CHIRP_SYNTDENUM (float)0.9025
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43 #define LPC_CHIRP_WEIGHTDENUM (float)0.4222
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44 #define LPC_LOOKBACK 60
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45 #define LPC_N_20MS 1
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46 #define LPC_N_30MS 2
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47 #define LPC_N_MAX 2
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48 #define LPC_ASYMDIFF 20
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49 #define LPC_BW (float)60.0
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50 #define LPC_WN (float)1.0001
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51 #define LSF_NSPLIT 3
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52 #define LSF_NUMBER_OF_STEPS 4
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53 #define LPC_HALFORDER (LPC_FILTERORDER/2)
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54
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55 /* cb settings */
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56
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57 #define CB_NSTAGES 3
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58 #define CB_EXPAND 2
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59 #define CB_MEML 147
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60 #define CB_FILTERLEN 2*4
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61 #define CB_HALFFILTERLEN 4
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62 #define CB_RESRANGE 34
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63 #define CB_MAXGAIN (float)1.3
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64
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65 /* enhancer */
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66
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67 #define ENH_BLOCKL 80 /* block length */
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68 #define ENH_BLOCKL_HALF (ENH_BLOCKL/2)
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69 #define ENH_HL 3 /* 2*ENH_HL+1 is number blocks
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70 in said second sequence */
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71 #define ENH_SLOP 2 /* max difference estimated and
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72 correct pitch period */
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73 #define ENH_PLOCSL 20 /* pitch-estimates and pitch-
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74 locations buffer length */
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75 #define ENH_OVERHANG 2
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76 #define ENH_UPS0 4 /* upsampling rate */
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77 #define ENH_FL0 3 /* 2*FLO+1 is the length of
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78 each filter */
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79 #define ENH_VECTL (ENH_BLOCKL+2*ENH_FL0)
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80
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81
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82
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83
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84
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85 #define ENH_CORRDIM (2*ENH_SLOP+1)
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86 #define ENH_NBLOCKS (BLOCKL_MAX/ENH_BLOCKL)
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87 #define ENH_NBLOCKS_EXTRA 5
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88 #define ENH_NBLOCKS_TOT 8 /* ENH_NBLOCKS +
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89 ENH_NBLOCKS_EXTRA */
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90 #define ENH_BUFL (ENH_NBLOCKS_TOT)*ENH_BLOCKL
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91 #define ENH_ALPHA0 (float)0.05
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92
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93 /* Down sampling */
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94
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95 #define FILTERORDER_DS 7
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96 #define DELAY_DS 3
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97 #define FACTOR_DS 2
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98
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99 /* bit stream defs */
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100
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101 #define NO_OF_BYTES_20MS 38
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102 #define NO_OF_BYTES_30MS 50
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103 #define NO_OF_WORDS_20MS 19
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104 #define NO_OF_WORDS_30MS 25
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105 #define STATE_BITS 3
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106 #define BYTE_LEN 8
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107 #define ULP_CLASSES 3
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108
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109 /* help parameters */
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110
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111 #define FLOAT_MAX (float)1.0e37
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112 #define EPS (float)2.220446049250313e-016
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113 #define PI (float)3.14159265358979323846
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114 #define MIN_SAMPLE -32768
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115 #define MAX_SAMPLE 32767
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116 #define TWO_PI (float)6.283185307
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117 #define PI2 (float)0.159154943
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118
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119 /* type definition encoder instance */
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120 typedef struct iLBC_ULP_Inst_t_ {
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121 int lsf_bits[6][ULP_CLASSES + 2];
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122 int start_bits[ULP_CLASSES + 2];
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123 int startfirst_bits[ULP_CLASSES + 2];
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124 int scale_bits[ULP_CLASSES + 2];
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125 int state_bits[ULP_CLASSES + 2];
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126 int extra_cb_index[CB_NSTAGES][ULP_CLASSES + 2];
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127 int extra_cb_gain[CB_NSTAGES][ULP_CLASSES + 2];
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128 int cb_index[NSUB_MAX][CB_NSTAGES][ULP_CLASSES + 2];
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129 int cb_gain[NSUB_MAX][CB_NSTAGES][ULP_CLASSES + 2];
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130 } iLBC_ULP_Inst_t;
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131
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132 /* type definition encoder instance */
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133
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134
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135
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136
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137
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138 typedef struct iLBC_Enc_Inst_t_ {
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139
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140 /* flag for frame size mode */
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141 int mode;
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142
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143 /* basic parameters for different frame sizes */
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144 int blockl;
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145 int nsub;
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146 int nasub;
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147 int no_of_bytes, no_of_words;
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148 int lpc_n;
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149 int state_short_len;
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150 const iLBC_ULP_Inst_t *ULP_inst;
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151
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152 /* analysis filter state */
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153 float anaMem[LPC_FILTERORDER];
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154
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155 /* old lsf parameters for interpolation */
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156 float lsfold[LPC_FILTERORDER];
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157 float lsfdeqold[LPC_FILTERORDER];
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158
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159 /* signal buffer for LP analysis */
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160 float lpc_buffer[LPC_LOOKBACK + BLOCKL_MAX];
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161
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162 /* state of input HP filter */
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163 float hpimem[4];
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164
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165 } iLBC_Enc_Inst_t;
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166
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167 /* type definition decoder instance */
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168 typedef struct iLBC_Dec_Inst_t_ {
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169
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170 /* flag for frame size mode */
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171 int mode;
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172
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173 /* basic parameters for different frame sizes */
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174 int blockl;
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175 int nsub;
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176 int nasub;
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177 int no_of_bytes, no_of_words;
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178 int lpc_n;
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179 int state_short_len;
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180 const iLBC_ULP_Inst_t *ULP_inst;
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181
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182 /* synthesis filter state */
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183 float syntMem[LPC_FILTERORDER];
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184
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185 /* old LSF for interpolation */
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186
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187
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188
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189
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190
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191 float lsfdeqold[LPC_FILTERORDER];
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192
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193 /* pitch lag estimated in enhancer and used in PLC */
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194 int last_lag;
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195
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196 /* PLC state information */
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197 int prevLag, consPLICount, prevPLI, prev_enh_pl;
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198 float prevLpc[LPC_FILTERORDER + 1];
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199 float prevResidual[NSUB_MAX * SUBL];
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200 float per;
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201 unsigned long seed;
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202
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203 /* previous synthesis filter parameters */
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204 float old_syntdenum[(LPC_FILTERORDER + 1) * NSUB_MAX];
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205
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206 /* state of output HP filter */
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207 float hpomem[4];
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208
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209 /* enhancer state information */
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210 int use_enhancer;
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211 float enh_buf[ENH_BUFL];
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212 float enh_period[ENH_NBLOCKS_TOT];
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213
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214 } iLBC_Dec_Inst_t;
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215
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216 #endif
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