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annotate libtwamr/spstproc.c @ 458:e26b974f7ba3

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doc/AMR-study-utils: update for the current situation
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 10 May 2024 18:45:36 +0000
parents a37687c6ff22
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 : subframePostProc.c
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11 * Purpose : Subframe post processing
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12 *
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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 "spstproc.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 "oper_32b.h"
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32 #include "no_count.h"
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33 #include "syn_filt.h"
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34 #include "cnst.h"
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35
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36 /*
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37 ********************************************************************************
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38 * LOCAL VARIABLES AND TABLES
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39 ********************************************************************************
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40 */
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41
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42 /*
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43 ********************************************************************************
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44 * PUBLIC PROGRAM CODE
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45 ********************************************************************************
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46 */
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47 int subframePostProc(
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48 Word16 *speech, /* i : speech segment */
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49 enum Mode mode, /* i : coder mode */
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50 Word16 i_subfr, /* i : Subframe nr */
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51 Word16 gain_pit, /* i : Pitch gain Q14 */
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52 Word16 gain_code, /* i : Decoded innovation gain */
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53 Word16 *Aq, /* i : A(z) quantized for the 4 subframes */
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54 Word16 synth[], /* i : Local snthesis */
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55 Word16 xn[], /* i : Target vector for pitch search */
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56 Word16 code[], /* i : Fixed codebook exitation */
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57 Word16 y1[], /* i : Filtered adaptive exitation */
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58 Word16 y2[], /* i : Filtered fixed codebook excitation */
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59 Word16 *mem_syn, /* i/o : memory of synthesis filter */
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60 Word16 *mem_err, /* o : pointer to error signal */
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61 Word16 *mem_w0, /* o : memory of weighting filter */
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62 Word16 *exc, /* o : long term prediction residual */
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63 Word16 *sharp /* o : pitch sharpening value */
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64 )
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65 {
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66 Word16 i, j, k;
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67 Word16 temp;
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68 Word32 L_temp;
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69 Word16 tempShift;
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70 Word16 kShift;
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71 Word16 pitch_fac;
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72
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73 test ();
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74 if (sub(mode, MR122) != 0)
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75 {
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76 tempShift = 1; move16 ();
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77 kShift = 2; move16 ();
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78 pitch_fac = gain_pit; move16 ();
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79 }
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80 else
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81 {
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82 tempShift = 2; move16 ();
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83 kShift = 4; move16 ();
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84 pitch_fac = shr (gain_pit, 1);
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85 }
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86
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87 /*------------------------------------------------------------*
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88 * - Update pitch sharpening "sharp" with quantized gain_pit *
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89 *------------------------------------------------------------*/
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90
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91 *sharp = gain_pit; move16 ();
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92 test ();
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93 if (sub(*sharp, SHARPMAX) > 0)
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94 {
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95 *sharp = SHARPMAX; move16 ();
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96 }
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97 /*------------------------------------------------------*
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98 * - Find the total excitation *
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99 * - find synthesis speech corresponding to exc[] *
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100 * - update filters memories for finding the target *
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101 * vector in the next subframe *
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102 * (update error[-m..-1] and mem_w_err[]) *
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103 *------------------------------------------------------*/
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104
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105 for (i = 0; i < L_SUBFR; i++) {
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106 /* exc[i] = gain_pit*exc[i] + gain_code*code[i]; */
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107
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108 /*
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109 * 12k2 others
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110 * ---------------------------------
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111 * exc Q0 Q0
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112 * gain_pit Q14 Q14
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113 * pitch_fac Q13 Q14
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114 * product: Q14 Q15
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115 *
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116 * code Q12 Q13
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117 * gain_code Q1 Q1
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118 * product Q14 Q15
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119 * sum Q14 Q15
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120 *
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121 * tempShift 2 1
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122 * sum<<tempShift Q16 Q16
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123 * result -> exc Q0 Q0
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124 */
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125 L_temp = L_mult (exc[i + i_subfr], pitch_fac);
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126 L_temp = L_mac (L_temp, code[i], gain_code);
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127 L_temp = L_shl (L_temp, tempShift);
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128 exc[i + i_subfr] = round (L_temp); move16 ();
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129 }
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130
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131 Syn_filt(Aq, &exc[i_subfr], &synth[i_subfr], L_SUBFR,
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132 mem_syn, 1);
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133
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134 for (i = L_SUBFR - M, j = 0; i < L_SUBFR; i++, j++) {
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135 mem_err[j] = sub(speech[i_subfr + i],
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136 synth[i_subfr + i]); move16 ();
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137 /*
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138 * 12k2 others
a37687c6ff22 libtwamr: integrate spstproc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 * ---------------------------------
a37687c6ff22 libtwamr: integrate spstproc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 * y1 Q0 Q0
a37687c6ff22 libtwamr: integrate spstproc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 * gain_pit Q14 Q14
a37687c6ff22 libtwamr: integrate spstproc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 * product Q15 Q15
a37687c6ff22 libtwamr: integrate spstproc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 * shifted prod. Q16 Q16
a37687c6ff22 libtwamr: integrate spstproc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 * temp Q0 Q0
a37687c6ff22 libtwamr: integrate spstproc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 *
a37687c6ff22 libtwamr: integrate spstproc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 * y2 Q10 Q12
a37687c6ff22 libtwamr: integrate spstproc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 * gain_code Q1 Q1
a37687c6ff22 libtwamr: integrate spstproc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 * product Q12 Q14
a37687c6ff22 libtwamr: integrate spstproc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 * kshift 4 2
a37687c6ff22 libtwamr: integrate spstproc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 * shifted prod. Q16 Q16
a37687c6ff22 libtwamr: integrate spstproc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 * k Q0 Q0
a37687c6ff22 libtwamr: integrate spstproc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 * mem_w0,xn,sum Q0 Q0
a37687c6ff22 libtwamr: integrate spstproc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 */
a37687c6ff22 libtwamr: integrate spstproc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 temp = extract_h(L_shl(L_mult(y1[i], gain_pit), 1));
a37687c6ff22 libtwamr: integrate spstproc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 k = extract_h(L_shl(L_mult(y2[i], gain_code), kShift));
a37687c6ff22 libtwamr: integrate spstproc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 mem_w0[j] = sub(xn[i], add(temp, k)); move16 ();
a37687c6ff22 libtwamr: integrate spstproc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 }
a37687c6ff22 libtwamr: integrate spstproc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158
a37687c6ff22 libtwamr: integrate spstproc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 return 0;
a37687c6ff22 libtwamr: integrate spstproc.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 }