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annotate libgsmfr2/short_term.c @ 485:751f06541fbb

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doc/Codec-utils: clarify lack of DHF in gsmfr-decode-rb
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:47:22 +0000
parents d320a8fa3392
children
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1 /*
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2 * This C source file has been adapted from TU-Berlin libgsm source,
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3 * original notice follows:
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4 *
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5 * Copyright 1992 by Jutta Degener and Carsten Bormann, Technische
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6 * Universitaet Berlin. See the accompanying file "COPYRIGHT" for
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7 * details. THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
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8 */
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9
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10 #include <stdint.h>
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11 #include "tw_gsmfr.h"
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12 #include "typedef.h"
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13 #include "ed_state.h"
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14 #include "ed_internal.h"
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15
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16 /*
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17 * SHORT TERM ANALYSIS FILTERING SECTION
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18 */
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19
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20 /* 4.2.8 */
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21
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22 static void Decoding_of_the_coded_Log_Area_Ratios (
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23 const word * LARc, /* coded log area ratio [0..7] IN */
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24 word * LARpp) /* out: decoded .. */
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25 {
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26 register word temp1 /* , temp2 */;
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27 register long ltmp; /* for GSM_ADD */
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28
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29 /* This procedure requires for efficient implementation
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30 * two tables.
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31 *
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32 * INVA[1..8] = integer( (32768 * 8) / real_A[1..8])
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33 * MIC[1..8] = minimum value of the LARc[1..8]
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34 */
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35
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36 /* Compute the LARpp[1..8]
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37 */
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38
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39 /* for (i = 1; i <= 8; i++, B++, MIC++, INVA++, LARc++, LARpp++) {
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40 *
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41 * temp1 = GSM_ADD( *LARc, *MIC ) << 10;
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42 * temp2 = *B << 1;
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43 * temp1 = GSM_SUB( temp1, temp2 );
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44 *
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45 * assert(*INVA != MIN_WORD);
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46 *
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47 * temp1 = GSM_MULT_R( *INVA, temp1 );
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48 * *LARpp = GSM_ADD( temp1, temp1 );
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49 * }
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50 */
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51
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52 #undef STEP
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53 #define STEP( B_TIMES_TWO, MIC, INVA ) \
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54 temp1 = GSM_ADD( *LARc++, MIC ) << 10; \
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55 temp1 = GSM_SUB( temp1, B_TIMES_TWO ); \
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56 temp1 = GSM_MULT_R( INVA, temp1 ); \
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57 *LARpp++ = GSM_ADD( temp1, temp1 );
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58
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59 STEP( 0, -32, 13107 );
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60 STEP( 0, -32, 13107 );
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61 STEP( 4096, -16, 13107 );
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62 STEP( -5120, -16, 13107 );
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63
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64 STEP( 188, -8, 19223 );
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65 STEP( -3584, -8, 17476 );
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66 STEP( -682, -4, 31454 );
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67 STEP( -2288, -4, 29708 );
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68
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69 /* NOTE: the addition of *MIC is used to restore
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70 * the sign of *LARc.
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71 */
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72 }
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73
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74 /* 4.2.9 */
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75 /* Computation of the quantized reflection coefficients
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76 */
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77
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78 /* 4.2.9.1 Interpolation of the LARpp[1..8] to get the LARp[1..8]
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79 */
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80
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81 /*
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82 * Within each frame of 160 analyzed speech samples the short term
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83 * analysis and synthesis filters operate with four different sets of
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84 * coefficients, derived from the previous set of decoded LARs(LARpp(j-1))
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85 * and the actual set of decoded LARs (LARpp(j))
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86 *
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87 * (Initial value: LARpp(j-1)[1..8] = 0.)
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88 */
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89
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90 static void Coefficients_0_12 (
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91 register word * LARpp_j_1,
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92 register word * LARpp_j,
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93 register word * LARp)
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94 {
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95 register int i;
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96 register longword ltmp;
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97
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98 for (i = 1; i <= 8; i++, LARp++, LARpp_j_1++, LARpp_j++) {
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99 *LARp = GSM_ADD( SASR( *LARpp_j_1, 2 ), SASR( *LARpp_j, 2 ));
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100 *LARp = GSM_ADD( *LARp, SASR( *LARpp_j_1, 1));
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101 }
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102 }
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103
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104 static void Coefficients_13_26 (
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105 register word * LARpp_j_1,
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106 register word * LARpp_j,
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107 register word * LARp)
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108 {
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109 register int i;
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110 register longword ltmp;
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111 for (i = 1; i <= 8; i++, LARpp_j_1++, LARpp_j++, LARp++) {
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112 *LARp = GSM_ADD( SASR( *LARpp_j_1, 1), SASR( *LARpp_j, 1 ));
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113 }
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114 }
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115
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116 static void Coefficients_27_39 (
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117 register word * LARpp_j_1,
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118 register word * LARpp_j,
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119 register word * LARp)
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120 {
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121 register int i;
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122 register longword ltmp;
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123
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124 for (i = 1; i <= 8; i++, LARpp_j_1++, LARpp_j++, LARp++) {
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
125 *LARp = GSM_ADD( SASR( *LARpp_j_1, 2 ), SASR( *LARpp_j, 2 ));
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
126 *LARp = GSM_ADD( *LARp, SASR( *LARpp_j, 1 ));
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
127 }
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
128 }
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 static void Coefficients_40_159 (
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
131 register word * LARpp_j,
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
132 register word * LARp)
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
133 {
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134 register int i;
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 for (i = 1; i <= 8; i++, LARp++, LARpp_j++)
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 *LARp = *LARpp_j;
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 }
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 /* 4.2.9.2 */
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 static void LARp_to_rp (
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 register word * LARp) /* [0..7] IN/OUT */
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 /*
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 * The input of this procedure is the interpolated LARp[0..7] array.
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 * The reflection coefficients, rp[i], are used in the analysis
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 * filter and in the synthesis filter.
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 */
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 {
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 register int i;
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 register word temp;
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 register longword ltmp;
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 for (i = 1; i <= 8; i++, LARp++) {
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 /* temp = GSM_ABS( *LARp );
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 *
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 * if (temp < 11059) temp <<= 1;
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 * else if (temp < 20070) temp += 11059;
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 * else temp = GSM_ADD( temp >> 2, 26112 );
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 *
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 * *LARp = *LARp < 0 ? -temp : temp;
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 */
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 if (*LARp < 0) {
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 temp = *LARp == MIN_WORD ? MAX_WORD : -(*LARp);
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
167 *LARp = - ((temp < 11059) ? temp << 1
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 : ((temp < 20070) ? temp + 11059
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169 : GSM_ADD( temp >> 2, 26112 )));
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170 } else {
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171 temp = *LARp;
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 *LARp = (temp < 11059) ? temp << 1
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 : ((temp < 20070) ? temp + 11059
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174 : GSM_ADD( temp >> 2, 26112 ));
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175 }
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176 }
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177 }
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
178
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179 /* 4.2.10 */
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180 static void Short_term_analysis_filtering (
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 struct gsmfr_0610_state * S,
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 register word * rp, /* [0..7] IN */
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183 register int k_n, /* k_end - k_start */
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184 register word * s /* [0..n-1] IN/OUT */
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185 )
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186 /*
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 * This procedure computes the short term residual signal d[..] to be fed
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 * to the RPE-LTP loop from the s[..] signal and from the local rp[..]
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 * array (quantized reflection coefficients). As the call of this
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190 * procedure can be done in many ways (see the interpolation of the LAR
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191 * coefficient), it is assumed that the computation begins with index
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 * k_start (for arrays d[..] and s[..]) and stops with index k_end
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
193 * (k_start and k_end are defined in 4.2.9.1). This procedure also
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194 * needs to keep the array u[0..7] in memory for each call.
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195 */
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 {
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197 register word * u = S->u;
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
198 register int i;
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
199 register word di, zzz, ui, sav, rpi;
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
200 register longword ltmp;
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202 for (; k_n--; s++) {
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 di = sav = *s;
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
206 for (i = 0; i < 8; i++) { /* YYY */
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
208 ui = u[i];
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
209 rpi = rp[i];
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210 u[i] = sav;
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
211
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212 zzz = GSM_MULT_R(rpi, di);
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213 sav = GSM_ADD( ui, zzz);
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
214
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
215 zzz = GSM_MULT_R(rpi, ui);
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
216 di = GSM_ADD( di, zzz );
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
217 }
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
218
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
219 *s = di;
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
220 }
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
221 }
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
222
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
223 static void Short_term_synthesis_filtering (
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
224 struct gsmfr_0610_state * S,
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
225 register word * rrp, /* [0..7] IN */
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
226 register int k, /* k_end - k_start */
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
227 register word * wt, /* [0..k-1] IN */
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
228 register word * sr /* [0..k-1] OUT */
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
229 )
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
230 {
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
231 register word * v = S->v;
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
232 register int i;
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
233 register word sri, tmp1, tmp2;
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
234 register longword ltmp; /* for GSM_ADD & GSM_SUB */
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
235
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
236 while (k--) {
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
237 sri = *wt++;
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
238 for (i = 8; i--;) {
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
239
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
240 /* sri = GSM_SUB( sri, gsm_mult_r( rrp[i], v[i] ) );
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
241 */
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
242 tmp1 = rrp[i];
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
243 tmp2 = v[i];
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
244 tmp2 = ( tmp1 == MIN_WORD && tmp2 == MIN_WORD
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
245 ? MAX_WORD
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
246 : 0x0FFFF & (( (longword)tmp1 * (longword)tmp2
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
247 + 16384) >> 15)) ;
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
248
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
249 sri = GSM_SUB( sri, tmp2 );
d320a8fa3392 libgsmfr2: integrate short_term.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
250
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251 /* v[i+1] = GSM_ADD( v[i], gsm_mult_r( rrp[i], sri ) );
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252 */
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253 tmp1 = ( tmp1 == MIN_WORD && sri == MIN_WORD
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254 ? MAX_WORD
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255 : 0x0FFFF & (( (longword)tmp1 * (longword)sri
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256 + 16384) >> 15)) ;
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257
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258 v[i+1] = GSM_ADD( v[i], tmp1);
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259 }
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260 *sr++ = v[0] = sri;
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261 }
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262 }
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263
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264 void Gsm_Short_Term_Analysis_Filter (
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265 struct gsmfr_0610_state * S,
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266
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267 const word * LARc, /* coded log area ratio [0..7] IN */
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268 word * s /* signal [0..159] IN/OUT */
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269 )
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270 {
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271 word * LARpp_j = S->LARpp[ S->j ];
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272 word * LARpp_j_1 = S->LARpp[ S->j ^= 1 ];
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273
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274 word LARp[8];
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275
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276 #undef FILTER
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277 # define FILTER Short_term_analysis_filtering
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278
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279 Decoding_of_the_coded_Log_Area_Ratios( LARc, LARpp_j );
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280
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281 Coefficients_0_12( LARpp_j_1, LARpp_j, LARp );
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282 LARp_to_rp( LARp );
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283 FILTER( S, LARp, 13, s);
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284
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285 Coefficients_13_26( LARpp_j_1, LARpp_j, LARp);
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286 LARp_to_rp( LARp );
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287 FILTER( S, LARp, 14, s + 13);
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288
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289 Coefficients_27_39( LARpp_j_1, LARpp_j, LARp);
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290 LARp_to_rp( LARp );
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291 FILTER( S, LARp, 13, s + 27);
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292
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293 Coefficients_40_159( LARpp_j, LARp);
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294 LARp_to_rp( LARp );
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295 FILTER( S, LARp, 120, s + 40);
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296 }
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297
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298 void Gsm_Short_Term_Synthesis_Filter (
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299 struct gsmfr_0610_state * S,
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300
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301 const word * LARcr, /* received log area ratios [0..7] IN */
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302 word * wt, /* received d [0..159] IN */
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303
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304 word * s /* signal s [0..159] OUT */
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305 )
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306 {
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307 word * LARpp_j = S->LARpp[ S->j ];
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308 word * LARpp_j_1 = S->LARpp[ S->j ^=1 ];
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309
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310 word LARp[8];
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311
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312 #undef FILTER
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313 # define FILTER Short_term_synthesis_filtering
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314
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315 Decoding_of_the_coded_Log_Area_Ratios( LARcr, LARpp_j );
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316
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317 Coefficients_0_12( LARpp_j_1, LARpp_j, LARp );
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318 LARp_to_rp( LARp );
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319 FILTER( S, LARp, 13, wt, s );
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320
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321 Coefficients_13_26( LARpp_j_1, LARpp_j, LARp);
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322 LARp_to_rp( LARp );
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323 FILTER( S, LARp, 14, wt + 13, s + 13 );
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324
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325 Coefficients_27_39( LARpp_j_1, LARpp_j, LARp);
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326 LARp_to_rp( LARp );
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327 FILTER( S, LARp, 13, wt + 27, s + 27 );
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328
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329 Coefficients_40_159( LARpp_j, LARp );
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330 LARp_to_rp( LARp );
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331 FILTER(S, LARp, 120, wt + 40, s + 40);
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332 }