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annotate libtwamr/cod_amr.h @ 485:751f06541fbb

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doc/Codec-utils: clarify lack of DHF in gsmfr-decode-rb
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:47:22 +0000
parents 93d6c6960a46
children
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1 /*
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2 *****************************************************************************
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3 *
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4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
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5 * R99 Version 3.3.0
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6 * REL-4 Version 4.1.0
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7 *
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8 *****************************************************************************
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9 *
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10 * File : cod_amr.h
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11 * Purpose : Main encoder routine operating on a frame basis.
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12 *
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13 *****************************************************************************
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14 */
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15 #ifndef cod_amr_h
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16 #define cod_amr_h "$Id $"
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17
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18 /*
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19 *****************************************************************************
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20 * INCLUDE FILES
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21 *****************************************************************************
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22 */
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23 #include "tw_amr.h"
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24 #include "typedef.h"
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25 #include "cnst.h"
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26 #include "lpc.h"
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27 #include "lsp.h"
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28 #include "cl_ltp.h"
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29 #include "gain_q.h"
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30 #include "p_ol_wgh.h"
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31 #include "ton_stab.h"
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32 #include "vad.h"
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33 #include "dtx_enc.h"
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34
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35 /*
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36 *****************************************************************************
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37 * DEFINITION OF DATA TYPES
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38 *****************************************************************************
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39 */
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40 /*-----------------------------------------------------------*
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41 * Coder constant parameters (defined in "cnst.h") *
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42 *-----------------------------------------------------------*
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43 * L_WINDOW : LPC analysis window size. *
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44 * L_NEXT : Samples of next frame needed for autocor. *
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45 * L_FRAME : Frame size. *
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46 * L_FRAME_BY2 : Half the frame size. *
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47 * L_SUBFR : Sub-frame size. *
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48 * M : LPC order. *
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49 * MP1 : LPC order+1 *
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50 * L_TOTAL7k4 : Total size of speech buffer. *
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51 * PIT_MIN7k4 : Minimum pitch lag. *
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52 * PIT_MAX : Maximum pitch lag. *
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53 * L_INTERPOL : Length of filter for interpolation *
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54 *-----------------------------------------------------------*/
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55 typedef struct {
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56 /* Speech vector */
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57 Word16 old_speech[L_TOTAL];
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58 Word16 *speech, *p_window, *p_window_12k2;
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59 Word16 *new_speech; /* Global variable */
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60
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61 /* Weight speech vector */
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62 Word16 old_wsp[L_FRAME + PIT_MAX];
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63 Word16 *wsp;
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64
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65 /* OL LTP states */
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66 Word16 old_lags[5];
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67 Word16 ol_gain_flg[2];
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68
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69 /* Excitation vector */
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70 Word16 old_exc[L_FRAME + PIT_MAX + L_INTERPOL];
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71 Word16 *exc;
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72
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73 /* Zero vector */
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74 Word16 ai_zero[L_SUBFR + MP1];
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75 Word16 *zero;
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76
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77 /* Impulse response vector */
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78 Word16 *h1;
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79 Word16 hvec[L_SUBFR * 2];
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80
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81 /* Substates */
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82 lpcState lpcSt;
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83 lspState lspSt;
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84 clLtpState clLtpSt;
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85 gainQuantState gainQuantSt;
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86 pitchOLWghtState pitchOLWghtSt;
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87 tonStabState tonStabSt;
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88 vadState vadSt;
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89 Flag dtx;
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90 dtx_encState dtx_encSt;
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91
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92 /* Filter's memory */
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93 Word16 mem_syn[M], mem_w0[M], mem_w[M];
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94 Word16 mem_err[M + L_SUBFR], *error;
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95
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96 Word16 sharp;
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97 } cod_amrState;
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98
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99 /*
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100 ********************************************************************************
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101 * DECLARATION OF PROTOTYPES
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102 ********************************************************************************
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103 */
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104
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105 /*
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106 **************************************************************************
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107 *
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108 * Function : cod_amr_reset
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109 * Purpose : Resets state memory
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110 * Returns : 0 on success
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111 *
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112 **************************************************************************
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113 */
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114 void cod_amr_reset (cod_amrState *st, Flag dtx, Flag use_vad2);
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115
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116 /***************************************************************************
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117 * FUNCTION: cod_amr_first
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118 *
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119 * PURPOSE: Copes with look-ahead.
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120 *
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121 * INPUTS:
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122 * No input argument are passed to this function. However, before
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123 * calling this function, 40 new speech data should be copied to the
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124 * vector new_speech[]. This is a global pointer which is declared in
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125 * this file (it points to the end of speech buffer minus 200).
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126 *
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127 ***************************************************************************/
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128
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129 int cod_amr_first(cod_amrState *st, /* i/o : State struct */
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130 Word16 new_speech[] /* i : speech input (L_FRAME) */
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131 );
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132
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133 /***************************************************************************
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134 * FUNCTION: cod_amr
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135 *
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136 * PURPOSE: Main encoder routine.
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137 *
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138 * DESCRIPTION: This function is called every 20 ms speech frame,
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139 * operating on the newly read 160 speech samples. It performs the
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140 * principle encoding functions to produce the set of encoded parameters
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141 * which include the LSP, adaptive codebook, and fixed codebook
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142 * quantization indices (addresses and gains).
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143 *
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144 * INPUTS:
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145 * No input argument are passed to this function. However, before
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146 * calling this function, 160 new speech data should be copied to the
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147 * vector new_speech[]. This is a global pointer which is declared in
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148 * this file (it points to the end of speech buffer minus 160).
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149 *
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150 * OUTPUTS:
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151 *
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152 * ana[]: vector of analysis parameters.
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153 * synth[]: Local synthesis speech (for debugging purposes)
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154 *
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155 ***************************************************************************/
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156
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157 int cod_amr(cod_amrState *st, /* i/o : State struct */
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158 enum Mode mode, /* i : AMR mode */
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159 Word16 new_speech[], /* i : speech input (L_FRAME) */
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160 Word16 ana[], /* o : Analysis parameters */
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161 enum Mode *usedMode, /* o : used mode */
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162 Word16 synth[] /* o : Local synthesis */
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163 );
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164
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165 #endif