annotate libtwamr/qgain795.c @ 483:4f13db3a7086

doc/Utils-overview: document new utilities
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:26:12 +0000
parents 2aa98051d445
children
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2aa98051d445 libtwamr: integrate qgain795.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 : qgain795.c
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11 * Purpose : pitch and codebook gain quantization for MR795
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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 "qgain795.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 "cnst.h"
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34 #include "log2.h"
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35 #include "pow2.h"
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36 #include "sqrt_l.h"
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37 #include "g_adapt.h"
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38 #include "calc_en.h"
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39 #include "q_gain_p.h"
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40 #include "mac_32.h"
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41 #include "gains_tab.h"
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42
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43 /*
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44 ********************************************************************************
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45 * LOCAL 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: MR795_gain_code_quant3
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52 *
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53 * PURPOSE: Pre-quantization of codebook gains, given three possible
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54 * LTP gains (using predicted codebook gain)
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55 *
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56 *************************************************************************/
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57 static void
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58 MR795_gain_code_quant3(
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59 Word16 exp_gcode0, /* i : predicted CB gain (exponent), Q0 */
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60 Word16 gcode0, /* i : predicted CB gain (norm.), Q14 */
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61 Word16 g_pitch_cand[], /* i : Pitch gain candidates (3), Q14 */
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62 Word16 g_pitch_cind[], /* i : Pitch gain cand. indices (3), Q0 */
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63 Word16 frac_coeff[], /* i : coefficients (5), Q15 */
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64 Word16 exp_coeff[], /* i : energy coefficients (5), Q0 */
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65 /* coefficients from calc_filt_ener()*/
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66 Word16 *gain_pit, /* o : Pitch gain, Q14 */
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67 Word16 *gain_pit_ind, /* o : Pitch gain index, Q0 */
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68 Word16 *gain_cod, /* o : Code gain, Q1 */
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69 Word16 *gain_cod_ind, /* o : Code gain index, Q0 */
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70 Word16 *qua_ener_MR122, /* o : quantized energy error, Q10 */
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71 /* (for MR122 MA predictor update) */
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72 Word16 *qua_ener /* o : quantized energy error, Q10 */
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73 /* (for other MA predictor update) */
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74 )
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75 {
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76 const Word16 *p;
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77 Word16 i, j, cod_ind, pit_ind;
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78 Word16 e_max, exp_code;
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79 Word16 g_pitch, g2_pitch, g_code, g2_code_h, g2_code_l;
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80 Word16 g_pit_cod_h, g_pit_cod_l;
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81 Word16 coeff[5], coeff_lo[5];
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82 Word16 exp_max[5];
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83 Word32 L_tmp, L_tmp0, dist_min;
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84
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85 /*
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86 * The error energy (sum) to be minimized consists of five terms, t[0..4].
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87 *
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88 * t[0] = gp^2 * <y1 y1>
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89 * t[1] = -2*gp * <xn y1>
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90 * t[2] = gc^2 * <y2 y2>
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91 * t[3] = -2*gc * <xn y2>
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92 * t[4] = 2*gp*gc * <y1 y2>
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93 *
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94 */
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95
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96 /* determine the scaling exponent for g_code: ec = ec0 - 10 */
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97 exp_code = sub(exp_gcode0, 10);
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98
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99 /* calculate exp_max[i] = s[i]-1 */
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100 exp_max[0] = sub(exp_coeff[0], 13); move16 ();
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101 exp_max[1] = sub(exp_coeff[1], 14); move16 ();
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102 exp_max[2] = add(exp_coeff[2], add(15, shl(exp_code, 1))); move16 ();
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103 exp_max[3] = add(exp_coeff[3], exp_code); move16 ();
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104 exp_max[4] = add(exp_coeff[4], add(exp_code,1)); move16 ();
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105
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106
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107 /*-------------------------------------------------------------------*
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108 * Find maximum exponent: *
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109 * ~~~~~~~~~~~~~~~~~~~~~~ *
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110 * *
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111 * For the sum operation, all terms must have the same scaling; *
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112 * that scaling should be low enough to prevent overflow. There- *
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113 * fore, the maximum scale is determined and all coefficients are *
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114 * re-scaled: *
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115 * *
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116 * e_max = max(exp_max[i]) + 1; *
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117 * e = exp_max[i]-e_max; e <= 0! *
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118 * c[i] = c[i]*2^e *
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119 *-------------------------------------------------------------------*/
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120
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121 e_max = exp_max[0]; move16 ();
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122 for (i = 1; i < 5; i++) /* implemented flattened */
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123 {
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124 move16(); test();
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125 if (sub(exp_max[i], e_max) > 0)
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126 {
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127 e_max = exp_max[i]; move16 ();
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128 }
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129 }
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130
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131 e_max = add(e_max, 1); /* To avoid overflow */
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132
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133 for (i = 0; i < 5; i++) {
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134 j = sub(e_max, exp_max[i]);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 L_tmp = L_deposit_h(frac_coeff[i]);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 L_tmp = L_shr(L_tmp, j);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 L_Extract(L_tmp, &coeff[i], &coeff_lo[i]);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 }
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 /*-------------------------------------------------------------------*
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 * Codebook search: *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 * ~~~~~~~~~~~~~~~~ *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 * *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 * For each of the candiates LTP gains in g_pitch_cand[], the terms *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 * t[0..4] are calculated from the values in the table (and the *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 * pitch gain candidate) and summed up; the result is the mean *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 * squared error for the LPT/CB gain pair. The index for the mini- *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 * mum MSE is stored and finally used to retrieve the quantized CB *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 * gain *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 *-------------------------------------------------------------------*/
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 /* start with "infinite" MSE */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 dist_min = MAX_32; move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 cod_ind = 0; move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 pit_ind = 0; move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 /* loop through LTP gain candidates */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 for (j = 0; j < 3; j++)
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 {
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 /* pre-calculate terms only dependent on pitch gain */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 g_pitch = g_pitch_cand[j]; move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 g2_pitch = mult(g_pitch, g_pitch);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 L_tmp0 = Mpy_32_16( coeff[0], coeff_lo[0], g2_pitch);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 L_tmp0 = Mac_32_16(L_tmp0, coeff[1], coeff_lo[1], g_pitch);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
167 p = &qua_gain_code[0];
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 for (i = 0; i < NB_QUA_CODE; i++)
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169 {
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170 g_code = *p++; move16 (); /* this is g_fac Q11 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171 p++; /* skip log2(g_fac) */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 p++; /* skip 20*log10(g_fac) */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174 g_code = mult(g_code, gcode0);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176 L_tmp = L_mult (g_code, g_code);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177 L_Extract (L_tmp, &g2_code_h, &g2_code_l);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
178
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179 L_tmp = L_mult(g_code, g_pitch);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180 L_Extract (L_tmp, &g_pit_cod_h, &g_pit_cod_l);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 L_tmp = Mac_32 (L_tmp0, coeff[2], coeff_lo[2],
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183 g2_code_h, g2_code_l);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184 L_tmp = Mac_32_16(L_tmp, coeff[3], coeff_lo[3],
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185 g_code);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186 L_tmp = Mac_32 (L_tmp, coeff[4], coeff_lo[4],
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 g_pit_cod_h, g_pit_cod_l);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 /* store table index if MSE for this index is lower
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190 than the minimum MSE seen so far; also store the
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191 pitch gain for this (so far) lowest MSE */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 test ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
193 if (L_sub(L_tmp, dist_min) < (Word32) 0)
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194 {
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195 dist_min = L_tmp; move32 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 cod_ind = i; move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197 pit_ind = j; move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
198 }
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
199 }
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
200 }
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202 /*------------------------------------------------------------------*
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203 * read quantized gains and new values for MA predictor memories *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205 *------------------------------------------------------------------*/
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
206
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207 /* Read the quantized gains */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
208 p = &qua_gain_code[add (add (cod_ind, cod_ind), cod_ind)]; move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
209 g_code = *p++; move16();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210 *qua_ener_MR122 = *p++; move16();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
211 *qua_ener = *p; move16();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213 /*------------------------------------------------------------------*
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
214 * calculate final fixed codebook gain: *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
215 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
216 * *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
217 * gc = gc0 * g *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
218 *------------------------------------------------------------------*/
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
219
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
220 L_tmp = L_mult(g_code, gcode0);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
221 L_tmp = L_shr(L_tmp, sub(9, exp_gcode0));
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
222 *gain_cod = extract_h(L_tmp);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
223 *gain_cod_ind = cod_ind; move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
224 *gain_pit = g_pitch_cand[pit_ind]; move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
225 *gain_pit_ind = g_pitch_cind[pit_ind]; move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
226 }
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
227
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
228
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
229 /*************************************************************************
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
230 *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
231 * FUNCTION: MR795_gain_code_quant_mod
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
232 *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
233 * PURPOSE: Modified quantization of the MR795 codebook gain
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
234 *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
235 * Uses pre-computed energy coefficients in frac_en[]/exp_en[]
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
236 *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
237 * frac_en[0]*2^exp_en[0] = <res res> // LP residual energy
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
238 * frac_en[1]*2^exp_en[1] = <exc exc> // LTP residual energy
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
239 * frac_en[2]*2^exp_en[2] = <exc code> // LTP/CB innovation dot product
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
240 * frac_en[3]*2^exp_en[3] = <code code> // CB innovation energy
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
241 *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
242 *************************************************************************/
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
243 static Word16
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
244 MR795_gain_code_quant_mod( /* o : index of quantization. */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
245 Word16 gain_pit, /* i : pitch gain, Q14 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
246 Word16 exp_gcode0, /* i : predicted CB gain (exponent), Q0 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
247 Word16 gcode0, /* i : predicted CB gain (norm.), Q14 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
248 Word16 frac_en[], /* i : energy coefficients (4),
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
249 fraction part, Q15 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
250 Word16 exp_en[], /* i : energy coefficients (4),
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
251 eponent part, Q0 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
252 Word16 alpha, /* i : gain adaptor factor (>0), Q15 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
253 Word16 gain_cod_unq, /* i : Code gain (unquantized) */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
254 /* (scaling: Q10 - exp_gcode0) */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
255 Word16 *gain_cod, /* i/o: Code gain (pre-/quantized), Q1 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
256 Word16 *qua_ener_MR122, /* o : quantized energy error, Q10 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
257 /* (for MR122 MA predictor update) */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
258 Word16 *qua_ener /* o : quantized energy error, Q10 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
259 /* (for other MA predictor update) */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
260 )
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
261 {
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
262 const Word16 *p;
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
263 Word16 i, index, tmp;
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
264 Word16 one_alpha;
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
265 Word16 exp, e_max;
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
266 Word16 g2_pitch, g_code;
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
267 Word16 g2_code_h, g2_code_l;
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
268 Word16 d2_code_h, d2_code_l;
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
269 Word16 coeff[5], coeff_lo[5], exp_coeff[5];
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
270 Word32 L_tmp, L_t0, L_t1, dist_min;
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
271 Word16 gain_code;
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
272
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
273 /*
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
274 Steps in calculation of the error criterion (dist):
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
275 ---------------------------------------------------
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
276
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
277 underlined = constant; alp = FLP value of alpha, alpha = FIP
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
278 ----------
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
279
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
280
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
281 ExEn = gp^2 * LtpEn + 2.0*gp*gc[i] * XC + gc[i]^2 * InnEn;
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
282 ------------ ------ -- -----
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
283
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
284 aExEn= alp * ExEn
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
285 = alp*gp^2*LtpEn + 2.0*alp*gp*XC* gc[i] + alp*InnEn* gc[i]^2
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
286 -------------- ------------- ---------
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
287
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
288 = t[1] + t[2] + t[3]
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
289
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
290 dist = d1 + d2;
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
291
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
292 d1 = (1.0 - alp) * InnEn * (gcu - gc[i])^2 = t[4]
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
293 ------------------- ---
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
294
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
295 d2 = alp * (ResEn - 2.0 * sqrt(ResEn*ExEn) + ExEn);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
296 --- ----- --- -----
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
297
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
298 = alp * (sqrt(ExEn) - sqrt(ResEn))^2
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
299 --- -----------
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
300
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
301 = (sqrt(aExEn) - sqrt(alp*ResEn))^2
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
302 ---------------
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
303
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
304 = (sqrt(aExEn) - t[0] )^2
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
305 ----
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
306
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
307 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
308
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
309 /*
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
310 * calculate scalings of the constant terms
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
311 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
312 gain_code = shl (*gain_cod, sub (10, exp_gcode0)); /* Q1 -> Q11 (-ec0) */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
313 g2_pitch = mult (gain_pit, gain_pit); /* Q14 -> Q13 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
314 /* 0 < alpha <= 0.5 => 0.5 <= 1-alpha < 1, i.e one_alpha is normalized */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
315 one_alpha = add (sub (32767, alpha), 1); /* 32768 - alpha */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
316
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
317
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
318 /* alpha <= 0.5 -> mult. by 2 to keep precision; compensate in exponent */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
319 tmp = extract_h (L_shl (L_mult (alpha, frac_en[1]), 1));
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
320 /* directly store in 32 bit variable because no further mult. required */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
321 L_t1 = L_mult (tmp, g2_pitch); move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
322 exp_coeff[1] = sub (exp_en[1], 15); move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
323
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
324
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
325 tmp = extract_h (L_shl (L_mult (alpha, frac_en[2]), 1));
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
326 coeff[2] = mult (tmp, gain_pit); move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
327 exp = sub (exp_gcode0, 10);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
328 exp_coeff[2] = add (exp_en[2], exp); move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
329
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
330
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
331 /* alpha <= 0.5 -> mult. by 2 to keep precision; compensate in exponent */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
332 coeff[3] = extract_h (L_shl (L_mult (alpha, frac_en[3]), 1));
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
333 exp = sub (shl (exp_gcode0, 1), 7);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
334 exp_coeff[3] = add (exp_en[3], exp); move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
335
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
336
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
337 coeff[4] = mult (one_alpha, frac_en[3]); move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
338 exp_coeff[4] = add (exp_coeff[3], 1); move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
339
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
340
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
341 L_tmp = L_mult (alpha, frac_en[0]);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
342 /* sqrt_l returns normalized value and 2*exponent
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
343 -> result = val >> (exp/2)
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
344 exp_coeff holds 2*exponent for c[0] */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
345 /* directly store in 32 bit variable because no further mult. required */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
346 L_t0 = sqrt_l_exp (L_tmp, &exp); /* normalization included in sqrt_l_exp */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
347 move32 (); /* function result */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
348 exp = add (exp, 47);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
349 exp_coeff[0] = sub (exp_en[0], exp); move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
350
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
351 /*
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
352 * Determine the maximum exponent occuring in the distance calculation
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
353 * and adjust all fractions accordingly (including a safety margin)
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
354 *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
355 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
356
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
357 /* find max(e[1..4],e[0]+31) */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
358 e_max = add (exp_coeff[0], 31);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
359 for (i = 1; i <= 4; i++)
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
360 {
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
361 test ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
362 if (sub (exp_coeff[i], e_max) > 0)
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
363 {
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
364 e_max = exp_coeff[i]; move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
365 }
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
366 }
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
367
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
368 /* scale c[1] (requires no further multiplication) */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
369 tmp = sub (e_max, exp_coeff[1]);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
370 L_t1 = L_shr(L_t1, tmp);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
371
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
372 /* scale c[2..4] (used in Mpy_32_16 in the quantizer loop) */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
373 for (i = 2; i <= 4; i++)
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
374 {
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
375 tmp = sub (e_max, exp_coeff[i]);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
376 L_tmp = L_deposit_h(coeff[i]);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
377 L_tmp = L_shr(L_tmp, tmp);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
378 L_Extract(L_tmp, &coeff[i], &coeff_lo[i]);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
379 }
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
380
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
381 /* scale c[0] (requires no further multiplication) */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
382 exp = sub (e_max, 31); /* new exponent */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
383 tmp = sub (exp, exp_coeff[0]);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
384 L_t0 = L_shr (L_t0, shr (tmp, 1));
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
385 /* perform correction by 1/sqrt(2) if exponent difference is odd */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
386 test (); logic16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
387 if ((tmp & 0x1) != 0)
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
388 {
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
389 L_Extract(L_t0, &coeff[0], &coeff_lo[0]);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
390 L_t0 = Mpy_32_16(coeff[0], coeff_lo[0],
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
391 23170); /* 23170 Q15 = 1/sqrt(2)*/
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
392 }
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
393
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
394 /* search the quantizer table for the lowest value
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
395 of the search criterion */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
396 dist_min = MAX_32; move32 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
397 index = 0; move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
398 p = &qua_gain_code[0]; move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
399
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
400 for (i = 0; i < NB_QUA_CODE; i++)
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
401 {
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
402 g_code = *p++; move16 (); /* this is g_fac (Q11) */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
403 p++; /* skip log2(g_fac) */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
404 p++; /* skip 20*log10(g_fac) */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
405 g_code = mult (g_code, gcode0);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
406
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
407 /* only continue if gc[i] < 2.0*gc
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
408 which is equiv. to g_code (Q10-ec0) < gain_code (Q11-ec0) */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
409 test ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
410 if (sub (g_code, gain_code) >= 0)
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
411 break;
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
412
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
413 L_tmp = L_mult (g_code, g_code);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
414 L_Extract (L_tmp, &g2_code_h, &g2_code_l);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
415
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
416 tmp = sub (g_code, gain_cod_unq);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
417 L_tmp = L_mult (tmp, tmp);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
418 L_Extract (L_tmp, &d2_code_h, &d2_code_l);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
419
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
420 /* t2, t3, t4 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
421 L_tmp = Mac_32_16 (L_t1, coeff[2], coeff_lo[2], g_code);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
422 L_tmp = Mac_32(L_tmp, coeff[3], coeff_lo[3], g2_code_h, g2_code_l);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
423
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
424 L_tmp = sqrt_l_exp (L_tmp, &exp);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
425 L_tmp = L_shr (L_tmp, shr (exp, 1));
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
426
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
427 /* d2 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
428 tmp = round (L_sub (L_tmp, L_t0));
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
429 L_tmp = L_mult (tmp, tmp);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
430
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
431 /* dist */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
432 L_tmp = Mac_32(L_tmp, coeff[4], coeff_lo[4], d2_code_h, d2_code_l);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
433
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
434 /* store table index if distance measure for this
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
435 index is lower than the minimum seen so far */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
436 test ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
437 if (L_sub (L_tmp, dist_min) < (Word32) 0)
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
438 {
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
439 dist_min = L_tmp; move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
440 index = i; move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
441 }
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
442 }
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
443
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
444 /*------------------------------------------------------------------*
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
445 * read quantized gains and new values for MA predictor memories *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
446 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
447 *------------------------------------------------------------------*/
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
448
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
449 /* Read the quantized gains */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
450 p = &qua_gain_code[add (add (index, index), index)]; move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
451 g_code = *p++; move16();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
452 *qua_ener_MR122 = *p++; move16();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
453 *qua_ener = *p; move16();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
454
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
455 /*------------------------------------------------------------------*
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
456 * calculate final fixed codebook gain: *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
457 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
458 * *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
459 * gc = gc0 * g *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
460 *------------------------------------------------------------------*/
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
461
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
462 L_tmp = L_mult(g_code, gcode0);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
463 L_tmp = L_shr(L_tmp, sub(9, exp_gcode0));
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
464 *gain_cod = extract_h(L_tmp);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
465
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
466 return index;
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
467 }
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
468
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
469 /*
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
470 ********************************************************************************
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
471 * PUBLIC PROGRAM CODE
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
472 ********************************************************************************
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
473 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
474
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
475 /*************************************************************************
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
476 *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
477 * FUNCTION: MR795_gain_quant
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
478 *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
479 * PURPOSE: pitch and codebook quantization for MR795
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
480 *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
481 *************************************************************************/
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
482 void
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
483 MR795_gain_quant(
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
484 GainAdaptState *adapt_st, /* i/o: gain adapter state structure */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
485 Word16 res[], /* i : LP residual, Q0 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
486 Word16 exc[], /* i : LTP excitation (unfiltered), Q0 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
487 Word16 code[], /* i : CB innovation (unfiltered), Q13 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
488 Word16 frac_coeff[], /* i : coefficients (5), Q15 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
489 Word16 exp_coeff[], /* i : energy coefficients (5), Q0 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
490 /* coefficients from calc_filt_ener() */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
491 Word16 exp_code_en, /* i : innovation energy (exponent), Q0 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
492 Word16 frac_code_en, /* i : innovation energy (fraction), Q15 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
493 Word16 exp_gcode0, /* i : predicted CB gain (exponent), Q0 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
494 Word16 frac_gcode0, /* i : predicted CB gain (fraction), Q15 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
495 Word16 L_subfr, /* i : Subframe length */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
496 Word16 cod_gain_frac, /* i : opt. codebook gain (fraction),Q15 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
497 Word16 cod_gain_exp, /* i : opt. codebook gain (exponent), Q0 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
498 Word16 gp_limit, /* i : pitch gain limit */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
499 Word16 *gain_pit, /* i/o: Pitch gain, Q14 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
500 Word16 *gain_cod, /* o : Code gain, Q1 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
501 Word16 *qua_ener_MR122, /* o : quantized energy error, Q10 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
502 /* (for MR122 MA predictor update) */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
503 Word16 *qua_ener, /* o : quantized energy error, Q10 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
504 /* (for other MA predictor update) */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
505 Word16 **anap /* o : Index of quantization */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
506 /* (first gain pitch, then code pitch)*/
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
507 )
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
508 {
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
509 Word16 frac_en[4];
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
510 Word16 exp_en[4];
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
511 Word16 ltpg, alpha, gcode0;
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
512 Word16 g_pitch_cand[3]; /* pitch gain candidates Q14 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
513 Word16 g_pitch_cind[3]; /* pitch gain indices Q0 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
514 Word16 gain_pit_index;
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
515 Word16 gain_cod_index;
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
516 Word16 exp;
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
517 Word16 gain_cod_unq; /* code gain (unq.) Q(10-exp_gcode0) */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
518
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
519
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
520 /* get list of candidate quantized pitch gain values
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
521 * and corresponding quantization indices
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
522 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
523 gain_pit_index = q_gain_pitch (MR795, gp_limit, gain_pit,
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
524 g_pitch_cand, g_pitch_cind);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
525 move16 (); /* function result */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
526
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
527 /*-------------------------------------------------------------------*
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
528 * predicted codebook gain *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
529 * ~~~~~~~~~~~~~~~~~~~~~~~ *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
530 * gc0 = 2^exp_gcode0 + 2^frac_gcode0 *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
531 * *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
532 * gcode0 (Q14) = 2^14*2^frac_gcode0 = gc0 * 2^(14-exp_gcode0) *
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
533 *-------------------------------------------------------------------*/
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
534 gcode0 = extract_l(Pow2(14, frac_gcode0)); /* Q14 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
535
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
536 /* pre-quantization of codebook gain
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
537 * (using three pitch gain candidates);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
538 * result: best guess of pitch gain and code gain
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
539 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
540 MR795_gain_code_quant3(
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
541 exp_gcode0, gcode0, g_pitch_cand, g_pitch_cind,
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
542 frac_coeff, exp_coeff,
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
543 gain_pit, &gain_pit_index, gain_cod, &gain_cod_index,
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
544 qua_ener_MR122, qua_ener);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
545
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
546 /* calculation of energy coefficients and LTP coding gain */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
547 calc_unfilt_energies(res, exc, code, *gain_pit, L_subfr,
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
548 frac_en, exp_en, &ltpg);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
549
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
550 /* run gain adaptor, calculate alpha factor to balance LTP/CB gain
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
551 * (this includes the gain adaptor update)
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
552 * Note: ltpg = 0 if frac_en[0] == 0, so the update is OK in that case
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
553 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
554 gain_adapt(adapt_st, ltpg, *gain_cod, &alpha);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
555
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
556 /* if this is a very low energy signal (threshold: see
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
557 * calc_unfilt_energies) or alpha <= 0 then don't run the modified quantizer
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
558 */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
559 test (); move16 (); test ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
560 if (frac_en[0] != 0 && alpha > 0)
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
561 {
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
562 /* innovation energy <cod cod> was already computed in gc_pred() */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
563 /* (this overwrites the LtpResEn which is no longer needed) */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
564 frac_en[3] = frac_code_en; move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
565 exp_en[3] = exp_code_en; move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
566
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
567 /* store optimum codebook gain in Q(10-exp_gcode0) */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
568 exp = add (sub (cod_gain_exp, exp_gcode0), 10);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
569 gain_cod_unq = shl (cod_gain_frac, exp);
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
570
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
571 /* run quantization with modified criterion */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
572 gain_cod_index = MR795_gain_code_quant_mod(
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
573 *gain_pit, exp_gcode0, gcode0,
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
574 frac_en, exp_en, alpha, gain_cod_unq,
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
575 gain_cod, qua_ener_MR122, qua_ener); move16 (); /* function result */
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
576 }
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
577
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
578 *(*anap)++ = gain_pit_index; move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
579 *(*anap)++ = gain_cod_index; move16 ();
2aa98051d445 libtwamr: integrate qgain795.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
580 }