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annotate libtwamr/cl_ltp.c @ 515:bb36ef735f25

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author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 30 Aug 2024 08:05:07 +0000
parents 85e9768d497f
children
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1 /*
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2 *****************************************************************************
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3 *
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4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
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5 * R99 Version 3.3.0
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6 * REL-4 Version 4.1.0
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7 *
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8 *****************************************************************************
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9 *
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10 * File : cl_ltp.c
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11 *
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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 * MODULE INCLUDE FILE AND VERSION ID
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18 *****************************************************************************
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19 */
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20 #include "namespace.h"
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21 #include "cl_ltp.h"
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22
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23 /*
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24 *****************************************************************************
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25 * INCLUDE FILES
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26 *****************************************************************************
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27 */
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28 #include <stddef.h>
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29 #include "typedef.h"
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30 #include "basic_op.h"
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31 #include "no_count.h"
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32 #include "oper_32b.h"
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33 #include "cnst.h"
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34 #include "convolve.h"
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35 #include "g_pitch.h"
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36 #include "pred_lt.h"
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37 #include "pitch_fr.h"
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38 #include "enc_lag3.h"
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39 #include "enc_lag6.h"
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40 #include "q_gain_p.h"
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41 #include "ton_stab.h"
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42
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43 /*
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44 *****************************************************************************
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45 * LOCAL VARIABLES AND TABLES
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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 * PUBLIC PROGRAM CODE
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52 *****************************************************************************
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53 */
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54
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55 /*************************************************************************
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56 *
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57 * Function: cl_ltp_reset
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58 * Purpose: Initializes state memory to zero
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59 *
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60 **************************************************************************
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61 */
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62 void cl_ltp_reset (clLtpState *state)
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63 {
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64 /* Reset pitch search states */
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65 Pitch_fr_reset (&state->pitchSt);
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66 }
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67
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68 /*************************************************************************
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69 *
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70 * Function: cl_ltp
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71 * Purpose: closed-loop fractional pitch search
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72 *
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73 **************************************************************************
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74 */
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75 int cl_ltp (
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76 clLtpState *clSt, /* i/o : State struct */
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77 tonStabState *tonSt, /* i/o : State struct */
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78 enum Mode mode, /* i : coder mode */
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79 Word16 frameOffset, /* i : Offset to subframe */
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80 Word16 T_op[], /* i : Open loop pitch lags */
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81 Word16 *h1, /* i : Impulse response vector Q12 */
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82 Word16 *exc, /* i/o : Excitation vector Q0 */
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83 Word16 res2[], /* i/o : Long term prediction residual Q0 */
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84 Word16 xn[], /* i : Target vector for pitch search Q0 */
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85 Word16 lsp_flag, /* i : LSP resonance flag */
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86 Word16 xn2[], /* o : Target vector for codebook search Q0 */
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87 Word16 y1[], /* o : Filtered adaptive excitation Q0 */
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88 Word16 *T0, /* o : Pitch delay (integer part) */
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89 Word16 *T0_frac, /* o : Pitch delay (fractional part) */
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90 Word16 *gain_pit, /* o : Pitch gain Q14 */
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91 Word16 g_coeff[], /* o : Correlations between xn, y1, & y2 */
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92 Word16 **anap, /* o : Analysis parameters */
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93 Word16 *gp_limit /* o : pitch gain limit */
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94 )
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95 {
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96 Word16 i;
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97 Word16 index;
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98 Word32 L_temp; /* temporarily variable */
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99 Word16 resu3; /* flag for upsample resolution */
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100 Word16 gpc_flag;
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101
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102 /*----------------------------------------------------------------------*
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103 * Closed-loop fractional pitch search *
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104 *----------------------------------------------------------------------*/
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105 *T0 = Pitch_fr(&clSt->pitchSt,
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106 mode, T_op, exc, xn, h1,
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107 L_SUBFR, frameOffset,
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108 T0_frac, &resu3, &index); move16 ();
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109
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110 *(*anap)++ = index; move16 ();
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111
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112 /*-----------------------------------------------------------------*
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113 * - find unity gain pitch excitation (adapitve codebook entry) *
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114 * with fractional interpolation. *
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115 * - find filtered pitch exc. y1[]=exc[] convolve with h1[]) *
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116 * - compute pitch gain and limit between 0 and 1.2 *
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117 * - update target vector for codebook search *
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118 * - find LTP residual. *
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119 *-----------------------------------------------------------------*/
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120
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121 Pred_lt_3or6(exc, *T0, *T0_frac, L_SUBFR, resu3);
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122
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123 Convolve(exc, h1, y1, L_SUBFR);
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124
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125 /* gain_pit is Q14 for all modes */
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126 *gain_pit = G_pitch(mode, xn, y1, g_coeff, L_SUBFR); move16 ();
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127
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128
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129 /* check if the pitch gain should be limit due to resonance in LPC filter */
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130 gpc_flag = 0; move16 ();
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131 *gp_limit = MAX_16; move16 ();
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132 test (); test ();
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133 if ((lsp_flag != 0) &&
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134 (sub(*gain_pit, GP_CLIP) > 0))
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135 {
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136 gpc_flag = check_gp_clipping(tonSt, *gain_pit); move16 ();
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137 }
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138
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139 /* special for the MR475, MR515 mode; limit the gain to 0.85 to */
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140 /* cope with bit errors in the decoder in a better way. */
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141 test (); test ();
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142 if ((sub (mode, MR475) == 0) || (sub (mode, MR515) == 0)) {
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143 test ();
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144 if ( sub (*gain_pit, 13926) > 0) {
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145 *gain_pit = 13926; /* 0.85 in Q14 */ move16 ();
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146 }
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147
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148 test ();
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149 if (gpc_flag != 0) {
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150 *gp_limit = GP_CLIP; move16 ();
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151 }
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152 }
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153 else
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parents:
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154 {
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155 test ();
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156 if (gpc_flag != 0)
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157 {
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158 *gp_limit = GP_CLIP; move16 ();
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parents:
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159 *gain_pit = GP_CLIP; move16 ();
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160 }
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parents:
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161 /* For MR122, gain_pit is quantized here and not in gainQuant */
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parents:
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162 if (test (), sub(mode, MR122)==0)
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163 {
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parents:
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164 *(*anap)++ = q_gain_pitch(MR122, *gp_limit, gain_pit,
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parents:
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165 NULL, NULL);
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166 move16 ();
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parents:
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167 }
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parents:
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168 }
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parents:
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169
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parents:
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170 /* update target vector und evaluate LTP residual */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171 for (i = 0; i < L_SUBFR; i++) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 L_temp = L_mult(y1[i], *gain_pit);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 L_temp = L_shl(L_temp, 1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174 xn2[i] = sub(xn[i], extract_h(L_temp)); move16 ();
85e9768d497f libtwamr: integrate cl_ltp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175
85e9768d497f libtwamr: integrate cl_ltp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176 L_temp = L_mult(exc[i], *gain_pit);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177 L_temp = L_shl(L_temp, 1);
85e9768d497f libtwamr: integrate cl_ltp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
178 res2[i] = sub(res2[i], extract_h(L_temp)); move16 ();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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179 }
85e9768d497f libtwamr: integrate cl_ltp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180
85e9768d497f libtwamr: integrate cl_ltp.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
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181 return 0;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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182 }