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annotate libtwamr/qua_gain.c @ 480:332397bc80aa

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doc/AMR-library-API: document public const data items
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 19 May 2024 23:18:17 +0000
parents b02e043dcba0
children
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b02e043dcba0 libtwamr: integrate qua_gain.c
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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 : qua_gain.c
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11 * Purpose : Quantization of pitch and codebook gains.
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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 "qua_gain.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 "tw_amr.h"
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30 #include "typedef.h"
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31 #include "basic_op.h"
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32 #include "oper_32b.h"
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33 #include "no_count.h"
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34 #include "cnst.h"
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35 #include "pow2.h"
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36 #include "gc_pred.h"
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37 #include "qua_gain_tab.h"
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38
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39 /*
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40 ********************************************************************************
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41 * PUBLIC PROGRAM CODE
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42 ********************************************************************************
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43 */
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44
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45 /*************************************************************************
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46 *
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47 * FUNCTION: Qua_gain()
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48 *
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49 * PURPOSE: Quantization of pitch and codebook gains.
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50 * (using predicted codebook gain)
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51 *
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52 *************************************************************************/
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53 Word16
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54 Qua_gain( /* o : index of quantization. */
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55 enum Mode mode, /* i : AMR mode */
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56 Word16 exp_gcode0, /* i : predicted CB gain (exponent), Q0 */
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57 Word16 frac_gcode0, /* i : predicted CB gain (fraction), Q15 */
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58 Word16 frac_coeff[], /* i : energy coeff. (5), fraction part, Q15 */
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59 Word16 exp_coeff[], /* i : energy coeff. (5), exponent part, Q0 */
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60 /* (frac_coeff and exp_coeff computed in */
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61 /* calc_filt_energies()) */
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62 Word16 gp_limit, /* i : pitch gain limit */
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63 Word16 *gain_pit, /* o : Pitch gain, Q14 */
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64 Word16 *gain_cod, /* o : Code gain, Q1 */
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65 Word16 *qua_ener_MR122, /* o : quantized energy error, Q10 */
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66 /* (for MR122 MA predictor update) */
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67 Word16 *qua_ener /* o : quantized energy error, Q10 */
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68 /* (for other MA predictor update) */
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69 )
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70 {
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71 const Word16 *p;
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72 Word16 i, j, index = 0;
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73 Word16 gcode0, e_max, exp_code;
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74 Word16 g_pitch, g2_pitch, g_code, g2_code, g_pit_cod;
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75 Word16 coeff[5], coeff_lo[5];
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76 Word16 exp_max[5];
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77 Word32 L_tmp, dist_min;
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78 const Word16 *table_gain;
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79 Word16 table_len;
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80
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81 test(); test(); test();
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82 if ( sub (mode, MR102) == 0 || sub (mode, MR74) == 0 || sub (mode, MR67) == 0)
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83 {
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84 table_len = VQ_SIZE_HIGHRATES; move16 ();
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85 table_gain = table_gain_highrates; move16 ();
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86 }
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87 else
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88 {
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89 table_len = VQ_SIZE_LOWRATES; move16 ();
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90 table_gain = table_gain_lowrates; move16 ();
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91 }
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92
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93 /*-------------------------------------------------------------------*
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94 * predicted codebook gain *
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95 * ~~~~~~~~~~~~~~~~~~~~~~~ *
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96 * gc0 = 2^exp_gcode0 + 2^frac_gcode0 *
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97 * *
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98 * gcode0 (Q14) = 2^14*2^frac_gcode0 = gc0 * 2^(14-exp_gcode0) *
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99 *-------------------------------------------------------------------*/
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100
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101 gcode0 = extract_l(Pow2(14, frac_gcode0));
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102
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103 /*-------------------------------------------------------------------*
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104 * Scaling considerations: *
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105 * ~~~~~~~~~~~~~~~~~~~~~~~ *
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106 *-------------------------------------------------------------------*/
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107
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108 /*
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109 * The error energy (sum) to be minimized consists of five terms, t[0..4].
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110 *
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111 * t[0] = gp^2 * <y1 y1>
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112 * t[1] = -2*gp * <xn y1>
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113 * t[2] = gc^2 * <y2 y2>
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114 * t[3] = -2*gc * <xn y2>
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115 * t[4] = 2*gp*gc * <y1 y2>
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116 *
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117 */
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118
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119 /* determine the scaling exponent for g_code: ec = ec0 - 11 */
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120 exp_code = sub(exp_gcode0, 11);
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121
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122 /* calculate exp_max[i] = s[i]-1 */
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123 exp_max[0] = sub(exp_coeff[0], 13); move16 ();
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124 exp_max[1] = sub(exp_coeff[1], 14); move16 ();
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125 exp_max[2] = add(exp_coeff[2], add(15, shl(exp_code, 1))); move16 ();
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126 exp_max[3] = add(exp_coeff[3], exp_code); move16 ();
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127 exp_max[4] = add(exp_coeff[4], add(1, exp_code)); move16 ();
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128
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129
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130 /*-------------------------------------------------------------------*
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131 * Find maximum exponent: *
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132 * ~~~~~~~~~~~~~~~~~~~~~~ *
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
133 * *
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134 * For the sum operation, all terms must have the same scaling; *
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 * that scaling should be low enough to prevent overflow. There- *
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 * fore, the maximum scale is determined and all coefficients are *
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 * re-scaled: *
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 * *
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 * e_max = max(exp_max[i]) + 1; *
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 * e = exp_max[i]-e_max; e <= 0! *
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 * c[i] = c[i]*2^e *
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 *-------------------------------------------------------------------*/
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 e_max = exp_max[0]; move16 ();
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 for (i = 1; i < 5; i++)
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 {
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 move16(); test();
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 if (sub(exp_max[i], e_max) > 0)
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 {
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 e_max = exp_max[i]; move16 ();
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 }
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 }
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 e_max = add(e_max, 1); /* To avoid overflow */
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 for (i = 0; i < 5; i++) {
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 j = sub(e_max, exp_max[i]);
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 L_tmp = L_deposit_h(frac_coeff[i]);
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 L_tmp = L_shr(L_tmp, j);
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 L_Extract(L_tmp, &coeff[i], &coeff_lo[i]);
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 }
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 /*-------------------------------------------------------------------*
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 * Codebook search: *
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 * ~~~~~~~~~~~~~~~~ *
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
167 * *
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 * For each pair (g_pitch, g_fac) in the table calculate the *
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169 * terms t[0..4] and sum them up; the result is the mean squared *
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170 * error for the quantized gains from the table. The index for the *
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171 * minimum MSE is stored and finally used to retrieve the quantized *
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 * gains *
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 *-------------------------------------------------------------------*/
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175 /* start with "infinite" MSE */
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176 dist_min = MAX_32; move32();
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
178 p = &table_gain[0]; move16 ();
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180 for (i = 0; i < table_len; i++)
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 {
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 g_pitch = *p++; move16 ();
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183 g_code = *p++; move16 (); /* this is g_fac */
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184 p++; /* skip log2(g_fac) */
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185 p++; /* skip 20*log10(g_fac) */
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 test ();
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 if (sub(g_pitch, gp_limit) <= 0)
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 {
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190 g_code = mult(g_code, gcode0);
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191 g2_pitch = mult(g_pitch, g_pitch);
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 g2_code = mult(g_code, g_code);
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
193 g_pit_cod = mult(g_code, g_pitch);
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195 L_tmp = Mpy_32_16(coeff[0], coeff_lo[0], g2_pitch);
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 L_tmp = L_add(L_tmp, Mpy_32_16(coeff[1], coeff_lo[1], g_pitch));
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197 L_tmp = L_add(L_tmp, Mpy_32_16(coeff[2], coeff_lo[2], g2_code));
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
198 L_tmp = L_add(L_tmp, Mpy_32_16(coeff[3], coeff_lo[3], g_code));
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
199 L_tmp = L_add(L_tmp, Mpy_32_16(coeff[4], coeff_lo[4], g_pit_cod));
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
200
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201 /* store table index if MSE for this index is lower
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202 than the minimum MSE seen so far */
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203 test ();
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 if (L_sub(L_tmp, dist_min) < (Word32) 0)
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205 {
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
206 dist_min = L_tmp; move32 ();
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207 index = i; move16 ();
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
208 }
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
209 }
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210 }
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
211
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212 /*------------------------------------------------------------------*
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213 * read quantized gains and new values for MA predictor memories *
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
214 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ *
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
215 *------------------------------------------------------------------*/
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
216
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
217 /* Read the quantized gains */
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
218 p = &table_gain[shl (index, 2)]; move16 ();
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
219 *gain_pit = *p++; move16();
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
220 g_code = *p++; move16();
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
221 *qua_ener_MR122 = *p++; move16();
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
222 *qua_ener = *p; move16();
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
223
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
224 /*------------------------------------------------------------------*
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
225 * calculate final fixed codebook gain: *
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
226 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ *
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
227 * *
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
228 * gc = gc0 * g *
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
229 *------------------------------------------------------------------*/
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
230
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
231 L_tmp = L_mult(g_code, gcode0);
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
232 L_tmp = L_shr(L_tmp, sub(10, exp_gcode0));
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
233 *gain_cod = extract_h(L_tmp);
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
234
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
235 return index;
b02e043dcba0 libtwamr: integrate qua_gain.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
236 }