FreeCalypso > hg > gsm-codec-lib

annotate libgsmefr/dec_12k2.c @ 133:b4b1c3a192c7

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doc/Binary-file-format: document gsmrec-dump
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 11 Dec 2022 05:24:11 +0000
parents d80e9f12a1d1
children 7dd6336e15b2
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1 /***************************************************************************
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2 *
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3 * FILE NAME: dec_12k2.c
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4 *
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5 * FUNCTIONS DEFINED IN THIS FILE:
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6 * Init_Decoder_12k2 and Decoder_12k2
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7 *
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8 *
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9 * Init_Decoder_12k2():
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10 * Initialization of variables for the decoder section.
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11 *
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12 * Decoder_12k2():
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13 * Speech decoder routine operating on a frame basis.
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14 *
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15 ***************************************************************************/
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16
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17 #include "gsm_efr.h"
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18 #include "typedef.h"
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19 #include "namespace.h"
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20 #include "basic_op.h"
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21 #include "sig_proc.h"
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22 #include "memops.h"
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23 #include "no_count.h"
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24 #include "codec.h"
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25 #include "cnst.h"
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26 #include "dec_state.h"
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28 #include "dtx.h"
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29
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30 /*---------------------------------------------------------------*
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31 * Decoder constant parameters (defined in "cnst.h") *
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32 *---------------------------------------------------------------*
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33 * L_FRAME : Frame size. *
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34 * L_FRAME_BY2 : Half the frame size. *
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35 * L_SUBFR : Sub-frame size. *
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36 * M : LPC order. *
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37 * MP1 : LPC order+1 *
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38 * PIT_MIN : Minimum pitch lag. *
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39 * PIT_MAX : Maximum pitch lag. *
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40 * L_INTERPOL : Length of filter for interpolation *
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41 * PRM_SIZE : size of vector containing analysis parameters *
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42 *---------------------------------------------------------------*/
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43
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44 /*--------------------------------------------------------*
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45 * Static memory allocation. *
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46 *--------------------------------------------------------*/
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48 /***************************************************************************
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49 *
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50 * FUNCTION: Init_Decoder_12k2
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51 *
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52 * PURPOSE: Initialization of variables for the decoder section.
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53 *
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54 ***************************************************************************/
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56 void Init_Decoder_12k2 (struct EFR_decoder_state *st)
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57 {
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58 /* Static vectors to zero */
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59
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60 Set_zero (st->old_exc, PIT_MAX + L_INTERPOL);
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61 Set_zero (st->mem_syn, M);
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62
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63 /* Initialize lsp_old [] */
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65 st->lsp_old[0] = 30000;
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66 st->lsp_old[1] = 26000;
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67 st->lsp_old[2] = 21000;
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68 st->lsp_old[3] = 15000;
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69 st->lsp_old[4] = 8000;
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70 st->lsp_old[5] = 0;
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71 st->lsp_old[6] = -8000;
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72 st->lsp_old[7] = -15000;
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73 st->lsp_old[8] = -21000;
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74 st->lsp_old[9] = -26000;
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75
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76 /* Initialize memories of bad frame handling */
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77
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78 st->prev_bf = 0;
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79 st->bf_state = 0;
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81 return;
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82 }
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83
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84 /***************************************************************************
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85 *
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86 * FUNCTION: Decoder_12k2
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87 *
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88 * PURPOSE: Speech decoder routine.
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89 *
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90 ***************************************************************************/
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91
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92 void Decoder_12k2 (
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93 struct EFR_decoder_state *st,
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94 Word16 bfi, /* input : Bad Frame Indication */
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95 const Word16 parm[], /* input : vector of synthesis parameters */
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96 Word16 synth[], /* output: synthesis speech */
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97 Word16 A_t[], /* output: decoded LP filter in 4 subframes */
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98 Word16 TAF,
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99 Word16 SID_flag
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100 )
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101 {
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102 Word16 *exc = st->old_exc + PIT_MAX + L_INTERPOL;
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103
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104 /* LPC coefficients */
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105
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106 Word16 *Az; /* Pointer on A_t */
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107
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108 /* LSPs */
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109
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110 Word16 lsp_new[M];
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111 Word16 lsp_mid[M];
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112
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113 /* Algebraic codevector */
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114
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115 Word16 code[L_SUBFR];
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116
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117 /* excitation */
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118
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119 Word16 excp[L_SUBFR];
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120
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121 /* Scalars */
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122
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123 Word16 i, i_subfr;
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124 Word16 T0, T0_frac, index;
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125 Word16 gain_pit, gain_code, pit_sharp;
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126 Word16 temp;
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127 Word32 L_temp;
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128
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129 /* Set state machine */
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diff changeset
130
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parents:
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131 if (bfi != 0)
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diff changeset
132 {
64
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diff changeset
133 st->bf_state = add (st->bf_state, 1);
53
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134 }
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
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diff changeset
135 else if (sub (st->bf_state, 6) == 0)
53
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136 {
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
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parents: 53
diff changeset
137 st->bf_state = 5;
53
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diff changeset
138 }
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diff changeset
139 else
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140 {
64
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diff changeset
141 st->bf_state = 0;
53
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142 }
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143
64
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diff changeset
144 if (sub (st->bf_state, 6) > 0)
53
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145 {
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
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diff changeset
146 st->bf_state = 6;
53
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147 }
64
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diff changeset
148 rx_dtx (st, TAF, bfi, SID_flag);
53
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149
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150 /* If this frame is the first speech frame after CNI period, */
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151 /* set the BFH state machine to an appropriate state depending */
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152 /* on whether there was DTX muting before start of speech or not */
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153 /* If there was DTX muting, the first speech frame is muted. */
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154 /* If there was no DTX muting, the first speech frame is not */
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155 /* muted. The BFH state machine starts from state 5, however, to */
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156 /* keep the audible noise resulting from a SID frame which is */
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157 /* erroneously interpreted as a good speech frame as small as */
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158 /* possible (the decoder output in this case is quickly muted) */
64
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diff changeset
159 if ((st->rxdtx_ctrl & RX_FIRST_SP_FLAG) != 0)
53
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160 {
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
161 if ((st->rxdtx_ctrl & RX_PREV_DTX_MUTING) != 0)
53
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162 {
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
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diff changeset
163 st->bf_state = 5;
1cc2968f883f libgsmefr: dec_12k2.c compiles
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diff changeset
164 st->prev_bf = 1;
53
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165 }
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166 else
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167 {
64
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diff changeset
168 st->bf_state = 5;
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diff changeset
169 st->prev_bf = 0;
53
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170 }
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171 }
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172
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
173 D_plsf_5 (st, parm, lsp_mid, lsp_new, bfi, st->rxdtx_ctrl,
1cc2968f883f libgsmefr: dec_12k2.c compiles
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diff changeset
174 st->rx_dtx_state);
53
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175
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176 /* Advance synthesis parameters pointer */
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177 parm += 5; move16 ();
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178
64
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diff changeset
179 if ((st->rxdtx_ctrl & RX_SP_FLAG) != 0)
53
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180 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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181 /* Interpolation of LPC for the 4 subframes */
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182
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
183 Int_lpc (st->lsp_old, lsp_mid, lsp_new, A_t);
53
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184 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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185 else
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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186 {
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187 /* Comfort noise: use the same parameters in each subframe */
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188 Lsp_Az (lsp_new, A_t);
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189
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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190 for (i = 0; i < MP1; i++)
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191 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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192 A_t[i + MP1] = A_t[i]; move16 ();
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193 A_t[i + 2 * MP1] = A_t[i]; move16 ();
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194 A_t[i + 3 * MP1] = A_t[i]; move16 ();
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195 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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parents:
diff changeset
196 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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parents:
diff changeset
197
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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198 /* update the LSPs for the next frame */
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199 for (i = 0; i < M; i++)
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diff changeset
200 {
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
201 st->lsp_old[i] = lsp_new[i];
53
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diff changeset
202 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
204 /*---------------------------------------------------------------------*
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205 * Loop for every subframe in the analysis frame *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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diff changeset
206 *---------------------------------------------------------------------*
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207 * The subframe size is L_SUBFR and the loop is repeated *
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208 * L_FRAME/L_SUBFR times *
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diff changeset
209 * - decode the pitch delay *
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210 * - decode algebraic code *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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diff changeset
211 * - decode pitch and codebook gains *
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212 * - find the excitation and compute synthesis speech *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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diff changeset
213 *---------------------------------------------------------------------*/
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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diff changeset
214
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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215 /* pointer to interpolated LPC parameters */
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
216 Az = A_t; move16 ();
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
217
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
218 for (i_subfr = 0; i_subfr < L_FRAME; i_subfr += L_SUBFR)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
219 {
65
cb080ec1817e libgsmefr: dec_lag6.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 64
diff changeset
220 Word16 T0_min, T0_max; /* previously static inside Dec_lag6() */
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
221
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
222 index = *parm++; move16 (); /* pitch index */
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diff changeset
223
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
224 if ((st->rxdtx_ctrl & RX_SP_FLAG) != 0)
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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diff changeset
225 {
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
226 T0 = Dec_lag6 (st, index, PIT_MIN, PIT_MAX, i_subfr, L_FRAME_BY2,
65
cb080ec1817e libgsmefr: dec_lag6.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 64
diff changeset
227 &T0_frac, bfi, &T0_min, &T0_max);
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
228
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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229 /*-------------------------------------------------*
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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230 * - Find the adaptive codebook vector. *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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diff changeset
231 *-------------------------------------------------*/
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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diff changeset
232
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
233 Pred_lt_6 (&exc[i_subfr], T0, T0_frac, L_SUBFR);
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
234 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
235 else
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
236 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
237 T0 = L_SUBFR; move16 ();
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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diff changeset
238 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
239
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
240 /*-------------------------------------------------------*
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
241 * - Decode pitch gain. *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
242 *-------------------------------------------------------*/
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
243
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
244 index = *parm++; move16 ();
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diff changeset
245
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
246 gain_pit = d_gain_pitch (st, index, bfi, st->bf_state, st->prev_bf,
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
247 st->rxdtx_ctrl);
53
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diff changeset
248
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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249 /*-------------------------------------------------------*
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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250 * - Decode innovative codebook. *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
251 *-------------------------------------------------------*/
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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diff changeset
252
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
253 if ((st->rxdtx_ctrl & RX_SP_FLAG) != 0)
53
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254 {
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255 dec_10i40_35bits (parm, code);
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256 }
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257 else
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258 { /* Use pseudo noise for excitation when SP_flag == 0 */
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
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259 build_CN_code (code, &st->L_pn_seed_rx);
53
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260 }
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261
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262 parm += 10; move16 ();
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263
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264 /*-------------------------------------------------------*
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265 * - Add the pitch contribution to code[]. *
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266 *-------------------------------------------------------*/
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267
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268 /* pit_sharp = gain_pit; */
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269 /* if (pit_sharp > 1.0) pit_sharp = 1.0; */
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270
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271 pit_sharp = shl (gain_pit, 3);
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272
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273 /* This loop is not entered when SP_FLAG is 0 */
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274 for (i = T0; i < L_SUBFR; i++)
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275 {
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276 temp = mult (code[i - T0], pit_sharp);
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277 code[i] = add (code[i], temp);
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278 move16 ();
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279 }
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
280
53
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281 /* post processing of excitation elements */
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282
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283 test (); /* This test is not passed when SP_FLAG is 0 */
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284 if (sub (pit_sharp, 16384) > 0)
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285 {
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286 for (i = 0; i < L_SUBFR; i++)
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287 {
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288 temp = mult (exc[i + i_subfr], pit_sharp);
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289 L_temp = L_mult (temp, gain_pit);
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290 L_temp = L_shl (L_temp, 1);
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291 excp[i] = round (L_temp);
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292 move16 ();
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293 }
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294 }
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295 /*-------------------------------------------------*
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296 * - Decode codebook gain. *
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297 *-------------------------------------------------*/
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298
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299 index = *parm++; move16 (); /* index of energy VQ */
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300
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
301 d_gain_code (st, index, code, L_SUBFR, &gain_code, bfi, st->bf_state,
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
302 st->prev_bf, st->rxdtx_ctrl, i_subfr, st->rx_dtx_state);
53
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303
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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304 /*-------------------------------------------------------*
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305 * - Find the total excitation. *
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306 * - Find synthesis speech corresponding to exc[]. *
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307 *-------------------------------------------------------*/
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308 for (i = 0; i < L_SUBFR; i++)
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diff changeset
309 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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310 /* exc[i] = gain_pit*exc[i] + gain_code*code[i]; */
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311
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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312 L_temp = L_mult (exc[i + i_subfr], gain_pit);
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313 L_temp = L_mac (L_temp, code[i], gain_code);
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parents:
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314 L_temp = L_shl (L_temp, 3);
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parents:
diff changeset
315
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
316 exc[i + i_subfr] = round (L_temp);
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317 move16 ();
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diff changeset
318 }
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diff changeset
319
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diff changeset
320 if (sub (pit_sharp, 16384) > 0)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
321 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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diff changeset
322 for (i = 0; i < L_SUBFR; i++)
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diff changeset
323 {
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324 excp[i] = add (excp[i], exc[i + i_subfr]);
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diff changeset
325 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
326 agc2 (&exc[i_subfr], excp, L_SUBFR);
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
327 Syn_filt (Az, excp, &synth[i_subfr], L_SUBFR, st->mem_syn, 1);
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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parents:
diff changeset
328 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
329 else
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
330 {
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
331 Syn_filt (Az, &exc[i_subfr], &synth[i_subfr], L_SUBFR,
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
332 st->mem_syn, 1);
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
333 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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parents:
diff changeset
334
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
335 /* interpolated LPC parameters for next subframe */
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
336 Az += MP1; move16 ();
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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diff changeset
337 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
338
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
339 /*--------------------------------------------------*
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
340 * Update signal for next frame. *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
341 * -> shift to the left by L_FRAME exc[] *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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parents:
diff changeset
342 *--------------------------------------------------*/
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
343
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
344 Copy (&st->old_exc[L_FRAME], &st->old_exc[0], PIT_MAX + L_INTERPOL);
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
345 st->prev_bf = bfi;
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
346
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
347 return;
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
348 }