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annotate libgsmefr/dec_12k2.c @ 242:f081a6850fb5

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libgsmfrp: new refined implementation The previous implementation exhibited the following defects, which are now fixed: 1) The last received valid SID was cached forever for the purpose of handling future invalid SIDs - we could have received some valid SID ages ago, then lots of speech or NO_DATA, and if we then get an invalid SID, we would resurrect the last valid SID from ancient history - a bad design. In our new design, we handle invalid SID based on the current state, much like BFI. 2) GSM 06.11 spec says clearly that after the second lost SID (received BFI=1 && TAF=1 in CN state) we need to gradually decrease the output level, rather than jump directly to emitting silence frames - we previously failed to implement such logic. 3) Per GSM 06.12 section 5.2, Xmaxc should be the same in all 4 subframes in a SID frame. What should we do if we receive an otherwise valid SID frame with different Xmaxc? Our previous approach would replicate this Xmaxc oddity in every subsequent generated CN frame, which is rather bad. In our new design, the very first CN frame (which can be seen as a transformation of the SID frame itself) retains the original 4 distinct Xmaxc, but all subsequent CN frames are based on the Xmaxc from the last subframe of the most recent SID.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 09 May 2023 05:16:31 +0000
parents 7dd6336e15b2
children
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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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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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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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parents:
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124 Word16 T0, T0_frac, index;
64
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Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
125 Word16 gain_pit, gain_code, pit_sharp;
53
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parents:
diff changeset
126 Word16 temp;
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
127 Word32 L_temp;
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
128
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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parents:
diff changeset
129 /* Set state machine */
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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parents:
diff changeset
130
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
131 if (bfi != 0)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
132 {
189
7dd6336e15b2 libgsmefr/dec_12k2.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents: 94
diff changeset
133 st->bf_state++;
53
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134 }
189
7dd6336e15b2 libgsmefr/dec_12k2.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents: 94
diff changeset
135 else if (st->bf_state == 6)
53
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parents:
diff changeset
136 {
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
137 st->bf_state = 5;
53
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parents:
diff changeset
138 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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parents:
diff changeset
139 else
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 {
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
141 st->bf_state = 0;
53
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parents:
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142 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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parents:
diff changeset
143
189
7dd6336e15b2 libgsmefr/dec_12k2.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents: 94
diff changeset
144 if (st->bf_state > 6)
53
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parents:
diff changeset
145 {
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
146 st->bf_state = 6;
53
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147 }
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
148 rx_dtx (st, TAF, bfi, SID_flag);
53
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149
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parents:
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150 /* If this frame is the first speech frame after CNI period, */
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parents:
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151 /* set the BFH state machine to an appropriate state depending */
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parents:
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152 /* on whether there was DTX muting before start of speech or not */
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parents:
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153 /* If there was DTX muting, the first speech frame is muted. */
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parents:
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154 /* If there was no DTX muting, the first speech frame is not */
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parents:
diff changeset
155 /* muted. The BFH state machine starts from state 5, however, to */
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parents:
diff changeset
156 /* keep the audible noise resulting from a SID frame which is */
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parents:
diff changeset
157 /* erroneously interpreted as a good speech frame as small as */
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parents:
diff changeset
158 /* possible (the decoder output in this case is quickly muted) */
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
159 if ((st->rxdtx_ctrl & RX_FIRST_SP_FLAG) != 0)
53
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parents:
diff changeset
160 {
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
161 if ((st->rxdtx_ctrl & RX_PREV_DTX_MUTING) != 0)
53
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parents:
diff changeset
162 {
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
163 st->bf_state = 5;
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
164 st->prev_bf = 1;
53
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parents:
diff changeset
165 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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parents:
diff changeset
166 else
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parents:
diff changeset
167 {
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
168 st->bf_state = 5;
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
169 st->prev_bf = 0;
53
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parents:
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170 }
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parents:
diff changeset
171 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
173 D_plsf_5 (st, parm, lsp_mid, lsp_new, bfi, st->rxdtx_ctrl,
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
174 st->rx_dtx_state);
53
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parents:
diff changeset
175
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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parents:
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176 /* Advance synthesis parameters pointer */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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177 parm += 5; move16 ();
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diff changeset
178
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
179 if ((st->rxdtx_ctrl & RX_SP_FLAG) != 0)
53
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parents:
diff changeset
180 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 /* Interpolation of LPC for the 4 subframes */
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parents:
diff changeset
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
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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parents:
diff changeset
184 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185 else
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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187 /* Comfort noise: use the same parameters in each subframe */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 Lsp_Az (lsp_new, A_t);
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parents:
diff changeset
189
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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diff changeset
190 for (i = 0; i < MP1; i++)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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parents:
diff changeset
191 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 A_t[i + MP1] = A_t[i]; move16 ();
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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parents:
diff changeset
193 A_t[i + 2 * MP1] = A_t[i]; move16 ();
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parents:
diff changeset
194 A_t[i + 3 * MP1] = A_t[i]; move16 ();
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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parents:
diff changeset
195 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
198 /* update the LSPs for the next frame */
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
199 for (i = 0; i < M; i++)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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>
parents:
diff changeset
204 /*---------------------------------------------------------------------*
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205 * Loop for every subframe in the analysis frame *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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parents:
diff changeset
206 *---------------------------------------------------------------------*
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
207 * The subframe size is L_SUBFR and the loop is repeated *
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
208 * L_FRAME/L_SUBFR times *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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parents:
diff changeset
209 * - decode the pitch delay *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210 * - decode algebraic code *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
211 * - decode pitch and codebook gains *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212 * - find the excitation and compute synthesis speech *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213 *---------------------------------------------------------------------*/
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
214
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
215 /* pointer to interpolated LPC parameters */
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
216 Az = A_t; move16 ();
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
217
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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>
parents:
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>
parents:
diff changeset
222 index = *parm++; move16 (); /* pitch index */
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
223
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
diff changeset
224 if ((st->rxdtx_ctrl & RX_SP_FLAG) != 0)
53
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
225 {
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 53
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>
parents:
diff changeset
228
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
229 /*-------------------------------------------------*
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
230 * - Find the adaptive codebook vector. *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
231 *-------------------------------------------------*/
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
232
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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>
parents:
diff changeset
234 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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>
parents:
diff changeset
237 T0 = L_SUBFR; move16 ();
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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>
parents:
diff changeset
240 /*-------------------------------------------------------*
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
241 * - Decode pitch gain. *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
242 *-------------------------------------------------------*/
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
243
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
244 index = *parm++; move16 ();
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
248
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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249 /*-------------------------------------------------------*
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250 * - Decode innovative codebook. *
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251 *-------------------------------------------------------*/
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252
64
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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
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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
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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 */
189
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284 if (pit_sharp > 16384)
53
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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
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diff changeset
301 d_gain_code (st, index, code, L_SUBFR, &gain_code, bfi, st->bf_state,
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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
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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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309 {
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310 /* exc[i] = gain_pit*exc[i] + gain_code*code[i]; */
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311
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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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314 L_temp = L_shl (L_temp, 3);
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315
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316 exc[i + i_subfr] = round (L_temp);
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317 move16 ();
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318 }
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319
189
7dd6336e15b2 libgsmefr/dec_12k2.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
320 if (pit_sharp > 16384)
53
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diff changeset
321 {
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322 for (i = 0; i < L_SUBFR; i++)
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323 {
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324 excp[i] = add (excp[i], exc[i + i_subfr]);
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325 }
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326 agc2 (&exc[i_subfr], excp, L_SUBFR);
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
327 Syn_filt (Az, excp, &synth[i_subfr], L_SUBFR, st->mem_syn, 1);
53
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diff changeset
328 }
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diff changeset
329 else
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diff changeset
330 {
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
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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>
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diff changeset
332 st->mem_syn, 1);
53
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diff changeset
333 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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diff changeset
334
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335 /* interpolated LPC parameters for next subframe */
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diff changeset
336 Az += MP1; move16 ();
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diff changeset
337 }
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diff changeset
338
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339 /*--------------------------------------------------*
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340 * Update signal for next frame. *
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diff changeset
341 * -> shift to the left by L_FRAME exc[] *
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diff changeset
342 *--------------------------------------------------*/
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diff changeset
343
64
1cc2968f883f libgsmefr: dec_12k2.c compiles
Mychaela Falconia <falcon@freecalypso.org>
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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>
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diff changeset
345 st->prev_bf = bfi;
53
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diff changeset
346
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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diff changeset
347 return;
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348 }