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annotate libgsmefr/dtx_dec.c @ 514:67b13a6a63c9

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libgsmhr1: implement validation for *.dec frames
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 25 Aug 2024 19:14:40 +0000
parents 17f690749099
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * This file is a product of splitting ETSI EFR dtx.c into parts;
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3 * the present module is the decoder-specific part.
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4 */
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5
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6 #include "gsm_efr.h"
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7 #include "typedef.h"
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8 #include "namespace.h"
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9 #include "basic_op.h"
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10 #include "cnst.h"
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11 #include "sig_proc.h"
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12 #include "memops.h"
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13 #include "no_count.h"
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14 #include "dtx.h"
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15 #include "dtx_defs.h"
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16 #include "dec_state.h"
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17
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18 /*************************************************************************
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19 *
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20 * FUNCTION NAME: reset_rx_dtx
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21 *
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22 * PURPOSE: Resets the static variables of the RX DTX handler to their
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23 * initial values
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24 *
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25 *************************************************************************/
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26
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27 void reset_rx_dtx (struct EFR_decoder_state *st)
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28 {
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29 Word16 i;
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30
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31 /* suppose infinitely long speech period before start */
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32
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33 st->rxdtx_aver_period = DTX_HANGOVER;
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34 st->rxdtx_N_elapsed = 0x7fff;
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35 st->rxdtx_ctrl = RX_SP_FLAG;
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36
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37 for (i = 0; i < DTX_HANGOVER; i++)
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38 {
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39 st->lsf_old_rx[i][0] = 1384;
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40 st->lsf_old_rx[i][1] = 2077;
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41 st->lsf_old_rx[i][2] = 3420;
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42 st->lsf_old_rx[i][3] = 5108;
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43 st->lsf_old_rx[i][4] = 6742;
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44 st->lsf_old_rx[i][5] = 8122;
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45 st->lsf_old_rx[i][6] = 9863;
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46 st->lsf_old_rx[i][7] = 11092;
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47 st->lsf_old_rx[i][8] = 12714;
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48 st->lsf_old_rx[i][9] = 13701;
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49 }
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50
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51 for (i = 0; i < 4 * DTX_HANGOVER; i++)
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52 {
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53 st->gain_code_old_rx[i] = 0;
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54 }
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55
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56 st->L_pn_seed_rx = PN_INITIAL_SEED;
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57 st->rx_dtx_state = CN_INT_PERIOD - 1;
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58
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59 st->prev_SID_frames_lost = 0;
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60 st->buf_p_rx = 0;
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61
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62 return;
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63 }
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64
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65 /*************************************************************************
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66 *
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67 * FUNCTION NAME: rx_dtx
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68 *
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69 * PURPOSE: DTX handler of the speech decoder. Determines when to update
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70 * the reference comfort noise parameters (LSF and gain) at the
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71 * end of the speech burst. Also classifies the incoming frames
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72 * according to SID flag and BFI flag
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73 * and determines when the transmission is active during comfort
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74 * noise insertion. This function also initializes the pseudo
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75 * noise generator shift register.
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76 *
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77 * Operation of the RX DTX handler is based on measuring the
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78 * lengths of speech bursts and the lengths of the pauses between
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79 * speech bursts to determine when there exists a hangover period
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80 * at the end of a speech burst. The idea is to keep in sync with
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81 * the TX DTX handler to be able to update the reference comfort
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82 * noise parameters at the same time instances.
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83 *
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84 * INPUTS: *rxdtx_ctrl Old decoder DTX control word
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85 * TAF Time alignment flag
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86 * bfi Bad frame indicator flag
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87 * SID_flag Silence descriptor flag
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88 *
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89 * OUTPUTS: *rxdtx_ctrl Updated decoder DTX control word
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90 * rx_dtx_state Updated state of comfort noise interpolation
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91 * period (global variable)
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92 * L_pn_seed_rx Initialized pseudo noise generator shift
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93 * register (global variable)
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94 *
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95 * RETURN VALUE: none
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96 *
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97 *************************************************************************/
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98
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99 void rx_dtx (
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100 struct EFR_decoder_state *st,
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101 Word16 TAF,
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102 Word16 bfi,
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103 Word16 SID_flag
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104 )
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105 {
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106 Word16 frame_type;
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107
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108 /* Frame classification according to bfi-flag and ternary-valued
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109 SID flag. The frames between SID updates (not actually trans-
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110 mitted) are also classified here; they will be discarded later
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111 and provided with "NO TRANSMISSION"-flag */
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112
192
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113 if ((SID_flag == 2) && (bfi == 0))
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114 {
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115 frame_type = VALID_SID_FRAME; move16 ();
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116 }
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117 else if ((SID_flag == 0) && (bfi == 0))
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118 {
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119 frame_type = GOOD_SPEECH_FRAME; move16 ();
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120 }
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121 else if ((SID_flag == 0) && (bfi != 0))
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122 {
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123 frame_type = UNUSABLE_FRAME; move16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
124 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
125 else
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
126 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
127 frame_type = INVALID_SID_FRAME; move16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
128 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 /* Update of decoder state */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
131 /* Previous frame was classified as a speech frame */
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
132 if ((st->rxdtx_ctrl & RX_SP_FLAG) != 0)
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
133 {
192
0303ba213e1c libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents: 119
diff changeset
134 if (frame_type == VALID_SID_FRAME)
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 {
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
136 st->rxdtx_ctrl = RX_FIRST_SID_UPDATE;
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 }
192
0303ba213e1c libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents: 119
diff changeset
138 else if (frame_type == INVALID_SID_FRAME)
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 {
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
140 st->rxdtx_ctrl = RX_FIRST_SID_UPDATE
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
141 | RX_INVALID_SID_FRAME;
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 }
192
0303ba213e1c libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents: 119
diff changeset
143 else if (frame_type == UNUSABLE_FRAME)
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 {
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
145 st->rxdtx_ctrl = RX_SP_FLAG;
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 }
192
0303ba213e1c libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents: 119
diff changeset
147 else if (frame_type == GOOD_SPEECH_FRAME)
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 {
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
149 st->rxdtx_ctrl = RX_SP_FLAG;
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 else
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 {
192
0303ba213e1c libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents: 119
diff changeset
154 if (frame_type == VALID_SID_FRAME)
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 {
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
156 st->rxdtx_ctrl = RX_CONT_SID_UPDATE;
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 }
192
0303ba213e1c libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents: 119
diff changeset
158 else if (frame_type == INVALID_SID_FRAME)
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 {
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
160 st->rxdtx_ctrl = RX_CONT_SID_UPDATE
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
161 | RX_INVALID_SID_FRAME;
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 }
192
0303ba213e1c libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents: 119
diff changeset
163 else if (frame_type == UNUSABLE_FRAME)
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 {
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
165 st->rxdtx_ctrl = RX_CNI_BFI;
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 }
192
0303ba213e1c libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents: 119
diff changeset
167 else if (frame_type == GOOD_SPEECH_FRAME)
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169 /* If the previous frame (during CNI period) was muted,
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170 raise the RX_PREV_DTX_MUTING flag */
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
171 if ((st->rxdtx_ctrl & RX_DTX_MUTING) != 0)
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 {
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
173 st->rxdtx_ctrl = RX_SP_FLAG | RX_FIRST_SP_FLAG
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
174 | RX_PREV_DTX_MUTING;
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176 else
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177 {
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
178 st->rxdtx_ctrl = RX_SP_FLAG | RX_FIRST_SP_FLAG;
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
183 if ((st->rxdtx_ctrl & RX_SP_FLAG) != 0)
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184 {
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
185 st->prev_SID_frames_lost = 0;
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
186 st->rx_dtx_state = CN_INT_PERIOD - 1;
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 else
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190 /* First SID frame */
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
191 if ((st->rxdtx_ctrl & RX_FIRST_SID_UPDATE) != 0)
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 {
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
193 st->prev_SID_frames_lost = 0;
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
194 st->rx_dtx_state = CN_INT_PERIOD - 1;
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197 /* SID frame detected, but not the first SID */
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
198 if ((st->rxdtx_ctrl & RX_CONT_SID_UPDATE) != 0)
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
199 {
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
200 st->prev_SID_frames_lost = 0;
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201
192
0303ba213e1c libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents: 119
diff changeset
202 if (frame_type == VALID_SID_FRAME)
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203 {
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
204 st->rx_dtx_state = 0;
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205 }
192
0303ba213e1c libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents: 119
diff changeset
206 else if (frame_type == INVALID_SID_FRAME)
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207 {
192
0303ba213e1c libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents: 119
diff changeset
208 if (st->rx_dtx_state < (CN_INT_PERIOD - 1))
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
209 {
192
0303ba213e1c libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents: 119
diff changeset
210 st->rx_dtx_state++;
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
211 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
214
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
215 /* Bad frame received in CNI mode */
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
216 if ((st->rxdtx_ctrl & RX_CNI_BFI) != 0)
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
217 {
192
0303ba213e1c libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents: 119
diff changeset
218 if (st->rx_dtx_state < (CN_INT_PERIOD - 1))
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
219 {
192
0303ba213e1c libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents: 119
diff changeset
220 st->rx_dtx_state++;
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
221 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
222
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
223 /* If an unusable frame is received during CNI period
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
224 when TAF == 1, the frame is classified as a lost
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
225 SID frame */
205
17f690749099 libgsmefr decoder: TAF is a Boolean flag, so compare against 0,
Mychaela Falconia <falcon@freecalypso.org>
parents: 192
diff changeset
226 if (TAF)
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
227 {
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
228 st->rxdtx_ctrl = st->rxdtx_ctrl | RX_LOST_SID_FRAME;
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
229 st->prev_SID_frames_lost = add (st->prev_SID_frames_lost, 1);
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
230 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
231 else /* No transmission occurred */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
232 {
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
233 st->rxdtx_ctrl = st->rxdtx_ctrl | RX_NO_TRANSMISSION;
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
234 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
235
192
0303ba213e1c libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents: 119
diff changeset
236 if (st->prev_SID_frames_lost > 1)
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
237 {
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
238 st->rxdtx_ctrl = st->rxdtx_ctrl | RX_DTX_MUTING;
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
239 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
240 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
241 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
242
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
243 /* N_elapsed (frames since last SID update) is incremented. If SID
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
244 is updated N_elapsed is cleared later in this function */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
245
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
246 st->rxdtx_N_elapsed = add (st->rxdtx_N_elapsed, 1);
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
247
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
248 if ((st->rxdtx_ctrl & RX_SP_FLAG) != 0)
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
249 {
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
250 st->rxdtx_aver_period = DTX_HANGOVER;
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
251 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
252 else
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
253 {
192
0303ba213e1c libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents: 119
diff changeset
254 if (st->rxdtx_N_elapsed > DTX_ELAPSED_THRESHOLD)
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
255 {
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
256 st->rxdtx_ctrl |= RX_UPD_SID_QUANT_MEM;
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
257 st->rxdtx_N_elapsed = 0;
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
258 st->rxdtx_aver_period = 0;
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
259 st->L_pn_seed_rx = PN_INITIAL_SEED;
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
260 }
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
261 else if (st->rxdtx_aver_period == 0)
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
262 {
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
263 st->rxdtx_N_elapsed = 0;
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
264 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
265 else
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
266 {
192
0303ba213e1c libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents: 119
diff changeset
267 st->rxdtx_aver_period--;
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
268 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
269 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
270
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
271 return;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
272 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
273
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
274 /*************************************************************************
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
275 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
276 * FUNCTION NAME: update_gain_code_history_rx
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
277 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
278 * PURPOSE: Update the fixed codebook gain parameter history of the
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
279 * decoder. The fixed codebook gain parameters kept in the buffer
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
280 * are used later for computing the reference fixed codebook
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
281 * gain parameter value.
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
282 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
283 * INPUTS: new_gain_code New fixed codebook gain value
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
284 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
285 * gain_code_old_tx[0..4*DTX_HANGOVER-1]
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
286 * Old fixed codebook gain history of decoder
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
287 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
288 * OUTPUTS: gain_code_old_tx[0..4*DTX_HANGOVER-1]
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
289 * Updated fixed codebk gain history of decoder
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
290 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
291 * RETURN VALUE: none
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
292 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
293 *************************************************************************/
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
294
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
295 void update_gain_code_history_rx (
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
296 struct EFR_decoder_state *st,
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
297 Word16 new_gain_code
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
298 )
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
299 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
300 /* Circular buffer */
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
301 st->gain_code_old_rx[st->buf_p_rx] = new_gain_code;
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
302
192
0303ba213e1c libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents: 119
diff changeset
303 if (st->buf_p_rx == (4 * DTX_HANGOVER - 1))
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
304 {
67
58b64224d4ac libgsmefr: dtx.c compiles
Mychaela Falconia <falcon@freecalypso.org>
parents: 66
diff changeset
305 st->buf_p_rx = 0;
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
306 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
307 else
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
308 {
192
0303ba213e1c libgsmefr/dtx_dec.c: perf opt
Mychaela Falconia <falcon@freecalypso.org>
parents: 119
diff changeset
309 st->buf_p_rx++;
66
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
310 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
311
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
312 return;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
313 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
314
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
315 /*************************************************************************
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
316 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
317 * FUNCTION NAME: interpolate_CN_param
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
318 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
319 * PURPOSE: Interpolate a comfort noise parameter value over the comfort
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
320 * noise update period.
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
321 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
322 * INPUTS: old_param The older parameter of the interpolation
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
323 * (the endpoint the interpolation is started
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
324 * from)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
325 * new_param The newer parameter of the interpolation
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
326 * (the endpoint the interpolation is ended to)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
327 * rx_dtx_state State of the comfort noise insertion period
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
328 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
329 * OUTPUTS: none
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
330 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
331 * RETURN VALUE: Interpolated CN parameter value
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
332 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
333 *************************************************************************/
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
334
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
335 Word16 interpolate_CN_param (
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
336 Word16 old_param,
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
337 Word16 new_param,
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
338 Word16 rx_dtx_state
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
339 )
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
340 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
341 static const Word16 interp_factor[CN_INT_PERIOD] =
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
342 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
343 0x0555, 0x0aaa, 0x1000, 0x1555, 0x1aaa, 0x2000,
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
344 0x2555, 0x2aaa, 0x3000, 0x3555, 0x3aaa, 0x4000,
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
345 0x4555, 0x4aaa, 0x5000, 0x5555, 0x5aaa, 0x6000,
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
346 0x6555, 0x6aaa, 0x7000, 0x7555, 0x7aaa, 0x7fff};
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
347 Word16 temp;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
348 Word32 L_temp;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
349
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
350 L_temp = L_mult (interp_factor[rx_dtx_state], new_param);
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
351 temp = sub (0x7fff, interp_factor[rx_dtx_state]);
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
352 temp = add (temp, 1);
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
353 L_temp = L_mac (L_temp, temp, old_param);
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
354 temp = round (L_temp);
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
355
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
356 return temp;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
357 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
358
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
359 /*************************************************************************
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
360 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
361 * FUNCTION NAME: interpolate_CN_lsf
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
362 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
363 * PURPOSE: Interpolate comfort noise LSF parameter vector over the comfort
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
364 * noise update period.
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
365 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
366 * INPUTS: lsf_old_CN[0..9]
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
367 * The older LSF parameter vector of the
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
368 * interpolation (the endpoint the interpolation
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
369 * is started from)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
370 * lsf_new_CN[0..9]
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
371 * The newer LSF parameter vector of the
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
372 * interpolation (the endpoint the interpolation
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
373 * is ended to)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
374 * rx_dtx_state State of the comfort noise insertion period
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
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375 *
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376 * OUTPUTS: lsf_interp_CN[0..9]
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377 * Interpolated LSF parameter vector
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378 *
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379 * RETURN VALUE: none
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380 *
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381 *************************************************************************/
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382
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383 void interpolate_CN_lsf (
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384 Word16 lsf_old_CN[M],
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385 Word16 lsf_new_CN[M],
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386 Word16 lsf_interp_CN[M],
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387 Word16 rx_dtx_state
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388 )
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389 {
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390 Word16 i;
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391
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392 for (i = 0; i < M; i++)
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393 {
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394 lsf_interp_CN[i] = interpolate_CN_param (lsf_old_CN[i],
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395 lsf_new_CN[i],
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396 rx_dtx_state); move16 ();
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397 }
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398
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399 return;
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400 }