FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/spstproc.c @ 486:f35c8fd9ceba
CHANGES: document gsmrec-dump improvements
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 20 May 2024 02:07:30 +0000 |
parents | a37687c6ff22 |
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rev | line source |
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1 /* |
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2 ******************************************************************************** |
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3 * |
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4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001 |
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5 * R99 Version 3.3.0 |
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6 * REL-4 Version 4.1.0 |
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7 * |
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8 ******************************************************************************** |
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9 * |
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10 * File : subframePostProc.c |
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11 * Purpose : Subframe post processing |
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12 * |
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13 ******************************************************************************** |
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14 */ |
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15 |
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16 /* |
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17 ******************************************************************************** |
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18 * MODULE INCLUDE FILE AND VERSION ID |
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19 ******************************************************************************** |
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20 */ |
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21 #include "namespace.h" |
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22 #include "spstproc.h" |
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23 |
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24 /* |
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25 ******************************************************************************** |
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26 * INCLUDE FILES |
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27 ******************************************************************************** |
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28 */ |
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29 #include "typedef.h" |
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30 #include "basic_op.h" |
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31 #include "oper_32b.h" |
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32 #include "no_count.h" |
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33 #include "syn_filt.h" |
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34 #include "cnst.h" |
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35 |
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36 /* |
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37 ******************************************************************************** |
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38 * LOCAL VARIABLES AND TABLES |
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39 ******************************************************************************** |
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40 */ |
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41 |
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42 /* |
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43 ******************************************************************************** |
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44 * PUBLIC PROGRAM CODE |
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45 ******************************************************************************** |
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46 */ |
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47 int subframePostProc( |
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48 Word16 *speech, /* i : speech segment */ |
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49 enum Mode mode, /* i : coder mode */ |
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50 Word16 i_subfr, /* i : Subframe nr */ |
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51 Word16 gain_pit, /* i : Pitch gain Q14 */ |
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52 Word16 gain_code, /* i : Decoded innovation gain */ |
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53 Word16 *Aq, /* i : A(z) quantized for the 4 subframes */ |
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54 Word16 synth[], /* i : Local snthesis */ |
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55 Word16 xn[], /* i : Target vector for pitch search */ |
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56 Word16 code[], /* i : Fixed codebook exitation */ |
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57 Word16 y1[], /* i : Filtered adaptive exitation */ |
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58 Word16 y2[], /* i : Filtered fixed codebook excitation */ |
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59 Word16 *mem_syn, /* i/o : memory of synthesis filter */ |
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60 Word16 *mem_err, /* o : pointer to error signal */ |
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61 Word16 *mem_w0, /* o : memory of weighting filter */ |
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62 Word16 *exc, /* o : long term prediction residual */ |
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63 Word16 *sharp /* o : pitch sharpening value */ |
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64 ) |
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65 { |
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66 Word16 i, j, k; |
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67 Word16 temp; |
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68 Word32 L_temp; |
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69 Word16 tempShift; |
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70 Word16 kShift; |
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71 Word16 pitch_fac; |
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72 |
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73 test (); |
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74 if (sub(mode, MR122) != 0) |
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75 { |
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76 tempShift = 1; move16 (); |
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77 kShift = 2; move16 (); |
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78 pitch_fac = gain_pit; move16 (); |
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79 } |
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80 else |
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81 { |
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82 tempShift = 2; move16 (); |
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83 kShift = 4; move16 (); |
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84 pitch_fac = shr (gain_pit, 1); |
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85 } |
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86 |
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87 /*------------------------------------------------------------* |
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88 * - Update pitch sharpening "sharp" with quantized gain_pit * |
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89 *------------------------------------------------------------*/ |
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90 |
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91 *sharp = gain_pit; move16 (); |
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92 test (); |
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93 if (sub(*sharp, SHARPMAX) > 0) |
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94 { |
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95 *sharp = SHARPMAX; move16 (); |
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96 } |
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97 /*------------------------------------------------------* |
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98 * - Find the total excitation * |
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99 * - find synthesis speech corresponding to exc[] * |
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100 * - update filters memories for finding the target * |
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101 * vector in the next subframe * |
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102 * (update error[-m..-1] and mem_w_err[]) * |
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103 *------------------------------------------------------*/ |
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104 |
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105 for (i = 0; i < L_SUBFR; i++) { |
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106 /* exc[i] = gain_pit*exc[i] + gain_code*code[i]; */ |
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107 |
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108 /* |
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109 * 12k2 others |
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110 * --------------------------------- |
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111 * exc Q0 Q0 |
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112 * gain_pit Q14 Q14 |
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113 * pitch_fac Q13 Q14 |
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114 * product: Q14 Q15 |
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115 * |
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116 * code Q12 Q13 |
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117 * gain_code Q1 Q1 |
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118 * product Q14 Q15 |
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119 * sum Q14 Q15 |
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120 * |
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121 * tempShift 2 1 |
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122 * sum<<tempShift Q16 Q16 |
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123 * result -> exc Q0 Q0 |
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124 */ |
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125 L_temp = L_mult (exc[i + i_subfr], pitch_fac); |
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126 L_temp = L_mac (L_temp, code[i], gain_code); |
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127 L_temp = L_shl (L_temp, tempShift); |
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128 exc[i + i_subfr] = round (L_temp); move16 (); |
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129 } |
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130 |
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131 Syn_filt(Aq, &exc[i_subfr], &synth[i_subfr], L_SUBFR, |
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132 mem_syn, 1); |
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133 |
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134 for (i = L_SUBFR - M, j = 0; i < L_SUBFR; i++, j++) { |
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135 mem_err[j] = sub(speech[i_subfr + i], |
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136 synth[i_subfr + i]); move16 (); |
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137 /* |
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138 * 12k2 others |
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139 * --------------------------------- |
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140 * y1 Q0 Q0 |
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141 * gain_pit Q14 Q14 |
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142 * product Q15 Q15 |
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143 * shifted prod. Q16 Q16 |
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144 * temp Q0 Q0 |
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145 * |
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146 * y2 Q10 Q12 |
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147 * gain_code Q1 Q1 |
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148 * product Q12 Q14 |
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149 * kshift 4 2 |
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150 * shifted prod. Q16 Q16 |
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151 * k Q0 Q0 |
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152 * mem_w0,xn,sum Q0 Q0 |
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153 */ |
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154 temp = extract_h(L_shl(L_mult(y1[i], gain_pit), 1)); |
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155 k = extract_h(L_shl(L_mult(y2[i], gain_code), kShift)); |
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156 mem_w0[j] = sub(xn[i], add(temp, k)); move16 (); |
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157 } |
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158 |
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159 return 0; |
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160 } |