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annotate libtwamr/ph_disp.c @ 478:936a08cc73ce

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doc/AMR-library-API: describe the decoder
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 19 May 2024 21:32:31 +0000
parents bde9f5804670
children
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1 /*
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2 ********************************************************************************
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3 *
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4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
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5 * R99 Version 3.3.0
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6 * REL-4 Version 4.1.0
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7 *
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8 ********************************************************************************
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9 *
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10 * File : ph_disp.c
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11 * Purpose : Perform adaptive phase dispersion of the excitation
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12 * signal.
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13 *
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14 ********************************************************************************
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15 */
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16 /*
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17 ********************************************************************************
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18 * MODULE INCLUDE FILE AND VERSION ID
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19 ********************************************************************************
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20 */
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21 #include "namespace.h"
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22 #include "ph_disp.h"
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23
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24 /*
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25 ********************************************************************************
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26 * INCLUDE FILES
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27 ********************************************************************************
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28 */
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29 #include "typedef.h"
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30 #include "basic_op.h"
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31 #include "no_count.h"
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32 #include "cnst.h"
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33 #include "memops.h"
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34
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35 /*
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36 ********************************************************************************
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37 * LOCAL VARIABLES AND TABLES
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38 ********************************************************************************
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39 */
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40
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41 #include "ph_disp.tab"
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42
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43 /*
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44 ********************************************************************************
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45 * PUBLIC PROGRAM CODE
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46 ********************************************************************************
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47 */
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48
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49 /*************************************************************************
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50 *
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51 * Function: ph_disp_reset
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52 *
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53 **************************************************************************
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54 */
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55 void ph_disp_reset (ph_dispState *state)
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56 {
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57 Word16 i;
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58
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59 for (i=0; i<PHDGAINMEMSIZE; i++)
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60 {
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61 state->gainMem[i] = 0;
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62 }
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63 state->prevState = 0;
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64 state->prevCbGain = 0;
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65 state->lockFull = 0;
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66 state->onset = 0; /* assume no onset in start */
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67 }
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68
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69 /*************************************************************************
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70 *
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71 * Function: ph_disp_lock
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72 *
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73 **************************************************************************
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74 */
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75 void ph_disp_lock (ph_dispState *state)
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76 {
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77 state->lockFull = 1;
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78 return;
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79 }
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80
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81 /*************************************************************************
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82 *
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83 * Function: ph_disp_release
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84 *
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85 **************************************************************************
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86 */
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87 void ph_disp_release (ph_dispState *state)
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88 {
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89 state->lockFull = 0;
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90 return;
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91 }
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92
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93
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94 /*************************************************************************
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95 *
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96 * Function: ph_disp
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97 *
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98 * Adaptive phase dispersion; forming of total excitation
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99 * (for synthesis part of decoder)
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100 *
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101 **************************************************************************
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102 */
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103 void ph_disp (
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104 ph_dispState *state, /* i/o : State struct */
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105 enum Mode mode, /* i : codec mode */
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106 Word16 x[], /* i/o Q0 : in: LTP excitation signal */
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107 /* out: total excitation signal */
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108 Word16 cbGain, /* i Q1 : Codebook gain */
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109 Word16 ltpGain, /* i Q14 : LTP gain */
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110 Word16 inno[], /* i/o Q13 : Innovation vector (Q12 for 12.2) */
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111 Word16 pitch_fac, /* i Q14 : pitch factor used to scale the
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112 LTP excitation (Q13 for 12.2) */
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113 Word16 tmp_shift /* i Q0 : shift factor applied to sum of
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114 scaled LTP ex & innov. before
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115 rounding */
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116 )
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117 {
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118 Word16 i, i1;
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119 Word16 tmp1;
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120 Word32 L_temp;
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121 Word16 impNr; /* indicator for amount of disp./filter used */
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122
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123 Word16 inno_sav[L_SUBFR];
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124 Word16 ps_poss[L_SUBFR];
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125 Word16 j, nze, nPulse, ppos;
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126 const Word16 *ph_imp; /* Pointer to phase dispersion filter */
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127
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128 /* Update LTP gain memory */
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129 for (i = PHDGAINMEMSIZE-1; i > 0; i--)
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130 {
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131 state->gainMem[i] = state->gainMem[i-1]; move16 ();
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132 }
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133 state->gainMem[0] = ltpGain; move16 ();
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134
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135 /* basic adaption of phase dispersion */
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136 test ();
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137 if (sub(ltpGain, PHDTHR2LTP) < 0) { /* if (ltpGain < 0.9) */
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138 test ();
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139 if (sub(ltpGain, PHDTHR1LTP) > 0)
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140 { /* if (ltpGain > 0.6 */
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diff changeset
141 impNr = 1; /* medium dispersion */ move16 ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 }
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 else
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 {
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 impNr = 0; /* maximum dispersion */ move16 ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 }
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 }
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 else
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 {
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 impNr = 2; /* no dispersion */ move16 ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 }
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 /* onset indicator */
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 /* onset = (cbGain > onFact * cbGainMem[0]) */
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 move32 ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 tmp1 = round(L_shl(L_mult(state->prevCbGain, ONFACTPLUS1), 2));
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 test ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 if (sub(cbGain, tmp1) > 0)
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 {
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 state->onset = ONLENGTH; move16 ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 }
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 else
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 {
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 test ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 if (state->onset > 0)
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 {
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
167 state->onset = sub (state->onset, 1); move16 ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 }
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169 }
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171 /* if not onset, check ltpGain buffer and use max phase dispersion if
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 half or more of the ltpGain-parameters say so */
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 test ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174 if (state->onset == 0)
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175 {
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176 /* Check LTP gain memory and set filter accordingly */
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177 i1 = 0; move16 ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
178 for (i = 0; i < PHDGAINMEMSIZE; i++)
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179 {
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180 test ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 if (sub(state->gainMem[i], PHDTHR1LTP) < 0)
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 {
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183 i1 = add (i1, 1);
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184 }
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185 }
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186 test ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 if (sub(i1, 2) > 0)
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 {
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 impNr = 0; move16 ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190 }
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 }
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
193 /* Restrict decrease in phase dispersion to one step if not onset */
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194 test (); test ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195 if ((sub(impNr, add(state->prevState, 1)) > 0) && (state->onset == 0))
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 {
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197 impNr = sub (impNr, 1);
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
198 }
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
199 /* if onset, use one step less phase dispersion */
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
200 test (); test ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201 if((sub(impNr, 2) < 0) && (state->onset > 0))
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202 {
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203 impNr = add (impNr, 1);
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 }
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
206 /* disable for very low levels */
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207 test ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
208 if(sub(cbGain, 10) < 0)
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
209 {
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210 impNr = 2; move16 ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
211 }
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213 test ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
214 if(sub(state->lockFull, 1) == 0)
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
215 {
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
216 impNr = 0; move16 ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
217 }
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
218
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
219 /* update static memory */
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
220 state->prevState = impNr; move16 ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
221 state->prevCbGain = cbGain; move16 ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
222
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
223 /* do phase dispersion for all modes but 12.2 and 7.4;
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
224 don't modify the innovation if impNr >=2 (= no phase disp) */
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
225 test (); test (); test(); test();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
226 if (sub(mode, MR122) != 0 &&
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
227 sub(mode, MR102) != 0 &&
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
228 sub(mode, MR74) != 0 &&
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
229 sub(impNr, 2) < 0)
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
230 {
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
231 /* track pulse positions, save innovation,
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
232 and initialize new innovation */
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
233 nze = 0; move16 ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
234 for (i = 0; i < L_SUBFR; i++)
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
235 {
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
236 move16 (); test();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
237 if (inno[i] != 0)
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
238 {
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
239 ps_poss[nze] = i; move16 ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
240 nze = add (nze, 1);
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
241 }
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
242 inno_sav[i] = inno[i]; move16 ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
243 inno[i] = 0; move16 ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
244 }
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
245 /* Choose filter corresponding to codec mode and dispersion criterium */
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
246 test ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
247 if (sub (mode, MR795) == 0)
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
248 {
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
249 test ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
250 if (impNr == 0)
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
251 {
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
252 ph_imp = ph_imp_low_MR795; move16 ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
253 }
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
254 else
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
255 {
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
256 ph_imp = ph_imp_mid_MR795; move16 ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
257 }
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
258 }
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
259 else
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
260 {
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
261 test ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
262 if (impNr == 0)
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
263 {
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
264 ph_imp = ph_imp_low; move16 ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
265 }
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
266 else
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
267 {
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
268 ph_imp = ph_imp_mid; move16 ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
269 }
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
270 }
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
271
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
272 /* Do phase dispersion of innovation */
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
273 for (nPulse = 0; nPulse < nze; nPulse++)
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
274 {
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
275 ppos = ps_poss[nPulse]; move16 ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
276
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
277 /* circular convolution with impulse response */
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
278 j = 0; move16 ();
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
279 for (i = ppos; i < L_SUBFR; i++)
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
280 {
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
281 /* inno[i1] += inno_sav[ppos] * ph_imp[i1-ppos] */
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
282 tmp1 = mult(inno_sav[ppos], ph_imp[j++]);
bde9f5804670 libtwamr: integrate ph_disp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
283 inno[i] = add(inno[i], tmp1); move16 ();
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284 }
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285
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286 for (i = 0; i < ppos; i++)
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287 {
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288 /* inno[i] += inno_sav[ppos] * ph_imp[L_SUBFR-ppos+i] */
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289 tmp1 = mult(inno_sav[ppos], ph_imp[j++]);
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290 inno[i] = add(inno[i], tmp1); move16 ();
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291 }
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292 }
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293 }
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294
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295 /* compute total excitation for synthesis part of decoder
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296 (using modified innovation if phase dispersion is active) */
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297 for (i = 0; i < L_SUBFR; i++)
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298 {
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299 /* x[i] = gain_pit*x[i] + cbGain*code[i]; */
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300 L_temp = L_mult ( x[i], pitch_fac);
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301 /* 12.2: Q0 * Q13 */
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302 /* 7.4: Q0 * Q14 */
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303 L_temp = L_mac (L_temp, inno[i], cbGain);
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304 /* 12.2: Q12 * Q1 */
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305 /* 7.4: Q13 * Q1 */
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306 L_temp = L_shl (L_temp, tmp_shift); /* Q16 */
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parents:
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307 x[i] = round (L_temp); move16 ();
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parents:
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308 }
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parents:
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309
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310 return;
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parents:
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311 }