annotate libgsmfr2/rpe.c @ 485:751f06541fbb

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 bee3a94f42a7
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 <assert.h>
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12 #include "tw_gsmfr.h"
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13 #include "typedef.h"
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14 #include "ed_state.h"
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15 #include "ed_internal.h"
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16
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17 /* 4.2.13 .. 4.2.17 RPE ENCODING SECTION
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18 */
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19
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20 /* 4.2.13 */
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21
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22 static void Weighting_filter (
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23 register word * e, /* signal [-5..0.39.44] IN */
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24 word * x /* signal [0..39] OUT */
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25 )
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26 /*
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27 * The coefficients of the weighting filter are stored in a table
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28 * (see table 4.4). The following scaling is used:
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29 *
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30 * H[0..10] = integer( real_H[ 0..10] * 8192 );
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31 */
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32 {
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33 /* word wt[ 50 ]; */
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34
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35 register longword L_result;
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36 register int k /* , i */ ;
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37
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38 /* Initialization of a temporary working array wt[0...49]
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39 */
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40
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41 /* for (k = 0; k <= 4; k++) wt[k] = 0;
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42 * for (k = 5; k <= 44; k++) wt[k] = *e++;
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43 * for (k = 45; k <= 49; k++) wt[k] = 0;
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44 *
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45 * (e[-5..-1] and e[40..44] are allocated by the caller,
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46 * are initially zero and are not written anywhere.)
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47 */
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48 e -= 5;
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49
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50 /* Compute the signal x[0..39]
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51 */
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52 for (k = 0; k <= 39; k++) {
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53
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54 L_result = 8192 >> 1;
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55
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56 /* for (i = 0; i <= 10; i++) {
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57 * L_temp = GSM_L_MULT( wt[k+i], gsm_H[i] );
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58 * L_result = GSM_L_ADD( L_result, L_temp );
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59 * }
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60 */
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61
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62 #undef STEP
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63 #define STEP( i, H ) (e[ k + i ] * (longword)H)
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64
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65 /* Every one of these multiplications is done twice --
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66 * but I don't see an elegant way to optimize this.
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67 * Do you?
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68 */
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69
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70 #ifdef STUPID_COMPILER
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71 L_result += STEP( 0, -134 ) ;
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72 L_result += STEP( 1, -374 ) ;
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73 /* + STEP( 2, 0 ) */
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74 L_result += STEP( 3, 2054 ) ;
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75 L_result += STEP( 4, 5741 ) ;
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76 L_result += STEP( 5, 8192 ) ;
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77 L_result += STEP( 6, 5741 ) ;
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78 L_result += STEP( 7, 2054 ) ;
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79 /* + STEP( 8, 0 ) */
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80 L_result += STEP( 9, -374 ) ;
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81 L_result += STEP( 10, -134 ) ;
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82 #else
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83 L_result +=
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84 STEP( 0, -134 )
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85 + STEP( 1, -374 )
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86 /* + STEP( 2, 0 ) */
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87 + STEP( 3, 2054 )
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88 + STEP( 4, 5741 )
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89 + STEP( 5, 8192 )
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90 + STEP( 6, 5741 )
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91 + STEP( 7, 2054 )
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92 /* + STEP( 8, 0 ) */
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93 + STEP( 9, -374 )
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94 + STEP(10, -134 )
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95 ;
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96 #endif
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97
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98 /* L_result = GSM_L_ADD( L_result, L_result ); (* scaling(x2) *)
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99 * L_result = GSM_L_ADD( L_result, L_result ); (* scaling(x4) *)
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100 *
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101 * x[k] = SASR( L_result, 16 );
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102 */
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103
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104 /* 2 adds vs. >>16 => 14, minus one shift to compensate for
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105 * those we lost when replacing L_MULT by '*'.
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106 */
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107
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108 L_result = SASR( L_result, 13 );
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109 x[k] = ( L_result < MIN_WORD ? MIN_WORD
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110 : (L_result > MAX_WORD ? MAX_WORD : L_result ));
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111 }
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112 }
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113
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114 /* 4.2.14 */
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115
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116 static void RPE_grid_selection (
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117 word * x, /* [0..39] IN */
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118 word * xM, /* [0..12] OUT */
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119 word * Mc_out /* OUT */
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120 )
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121 /*
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122 * The signal x[0..39] is used to select the RPE grid which is
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123 * represented by Mc.
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124 */
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125 {
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126 /* register word temp1; */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
127 register int /* m, */ i;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
128 register longword L_result, L_temp;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129 longword EM; /* xxx should be L_EM? */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 word Mc;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
131
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
132 longword L_common_0_3;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
133
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134 EM = 0;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 Mc = 0;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 /* for (m = 0; m <= 3; m++) {
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 * L_result = 0;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 *
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 *
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 * for (i = 0; i <= 12; i++) {
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 *
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 * temp1 = SASR( x[m + 3*i], 2 );
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 *
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 * assert(temp1 != MIN_WORD);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 *
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 * L_temp = GSM_L_MULT( temp1, temp1 );
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 * L_result = GSM_L_ADD( L_temp, L_result );
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 * }
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 *
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 * if (L_result > EM) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 * Mc = m;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 * EM = L_result;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 * }
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 * }
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 #undef STEP
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 #define STEP( m, i ) L_temp = SASR( x[m + 3 * i], 2 ); \
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 L_result += L_temp * L_temp;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 /* common part of 0 and 3 */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 L_result = 0;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 STEP( 0, 1 ); STEP( 0, 2 ); STEP( 0, 3 ); STEP( 0, 4 );
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 STEP( 0, 5 ); STEP( 0, 6 ); STEP( 0, 7 ); STEP( 0, 8 );
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
167 STEP( 0, 9 ); STEP( 0, 10); STEP( 0, 11); STEP( 0, 12);
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 L_common_0_3 = L_result;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170 /* i = 0 */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 STEP( 0, 0 );
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 L_result <<= 1; /* implicit in L_MULT */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174 EM = L_result;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176 /* i = 1 */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
178 L_result = 0;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179 STEP( 1, 0 );
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180 STEP( 1, 1 ); STEP( 1, 2 ); STEP( 1, 3 ); STEP( 1, 4 );
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 STEP( 1, 5 ); STEP( 1, 6 ); STEP( 1, 7 ); STEP( 1, 8 );
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 STEP( 1, 9 ); STEP( 1, 10); STEP( 1, 11); STEP( 1, 12);
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183 L_result <<= 1;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184 if (L_result > EM) {
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185 Mc = 1;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186 EM = L_result;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 }
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 /* i = 2 */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191 L_result = 0;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 STEP( 2, 0 );
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
193 STEP( 2, 1 ); STEP( 2, 2 ); STEP( 2, 3 ); STEP( 2, 4 );
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194 STEP( 2, 5 ); STEP( 2, 6 ); STEP( 2, 7 ); STEP( 2, 8 );
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195 STEP( 2, 9 ); STEP( 2, 10); STEP( 2, 11); STEP( 2, 12);
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 L_result <<= 1;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197 if (L_result > EM) {
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
198 Mc = 2;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
199 EM = L_result;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
200 }
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202 /* i = 3 */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 L_result = L_common_0_3;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205 STEP( 3, 12 );
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
206 L_result <<= 1;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207 if (L_result > EM) {
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
208 Mc = 3;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
209 EM = L_result;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210 }
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
211
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212 /**/
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
214 /* Down-sampling by a factor 3 to get the selected xM[0..12]
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
215 * RPE sequence.
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
216 */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
217 for (i = 0; i <= 12; i ++) xM[i] = x[Mc + 3*i];
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
218 *Mc_out = Mc;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
219 }
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
220
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
221 /* 4.12.15 */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
222
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
223 static void APCM_quantization_xmaxc_to_exp_mant (
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
224 word xmaxc, /* IN */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
225 word * exp_out, /* OUT */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
226 word * mant_out ) /* OUT */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
227 {
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
228 word exp, mant;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
229
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
230 /* Compute exponent and mantissa of the decoded version of xmaxc
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
231 */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
232
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
233 exp = 0;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
234 if (xmaxc > 15) exp = SASR(xmaxc, 3) - 1;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
235 mant = xmaxc - (exp << 3);
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
236
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
237 if (mant == 0) {
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
238 exp = -4;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
239 mant = 7;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
240 }
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
241 else {
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
242 while (mant <= 7) {
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
243 mant = mant << 1 | 1;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
244 exp--;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
245 }
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
246 mant -= 8;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
247 }
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
248
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
249 assert( exp >= -4 && exp <= 6 );
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
250 assert( mant >= 0 && mant <= 7 );
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
251
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
252 *exp_out = exp;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
253 *mant_out = mant;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
254 }
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
255
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
256 static void APCM_quantization (
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257 word * xM, /* [0..12] IN */
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258
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259 word * xMc, /* [0..12] OUT */
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260 word * mant_out, /* OUT */
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261 word * exp_out, /* OUT */
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262 word * xmaxc_out /* OUT */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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263 )
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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264 {
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
265 int i, itest;
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Mychaela Falconia <falcon@freecalypso.org>
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266
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Mychaela Falconia <falcon@freecalypso.org>
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267 word xmax, xmaxc, temp, temp1, temp2;
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268 word exp, mant;
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269
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270 /* Find the maximum absolute value xmax of xM[0..12].
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271 */
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272
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273 xmax = 0;
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Mychaela Falconia <falcon@freecalypso.org>
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274 for (i = 0; i <= 12; i++) {
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275 temp = xM[i];
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276 temp = GSM_ABS(temp);
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277 if (temp > xmax) xmax = temp;
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278 }
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279
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280 /* Qantizing and coding of xmax to get xmaxc.
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Mychaela Falconia <falcon@freecalypso.org>
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281 */
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282
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Mychaela Falconia <falcon@freecalypso.org>
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283 exp = 0;
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Mychaela Falconia <falcon@freecalypso.org>
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284 temp = SASR( xmax, 9 );
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285 itest = 0;
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286
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Mychaela Falconia <falcon@freecalypso.org>
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287 for (i = 0; i <= 5; i++) {
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Mychaela Falconia <falcon@freecalypso.org>
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288 itest |= (temp <= 0);
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Mychaela Falconia <falcon@freecalypso.org>
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289 temp = SASR( temp, 1 );
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290
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Mychaela Falconia <falcon@freecalypso.org>
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291 assert(exp <= 5);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
292 if (itest == 0) exp++; /* exp = add (exp, 1) */
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Mychaela Falconia <falcon@freecalypso.org>
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293 }
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294
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295 assert(exp <= 6 && exp >= 0);
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296 temp = exp + 5;
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297
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Mychaela Falconia <falcon@freecalypso.org>
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298 assert(temp <= 11 && temp >= 0);
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Mychaela Falconia <falcon@freecalypso.org>
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299 xmaxc = gsm_add( SASR(xmax, temp), exp << 3 );
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300
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
301 /* Quantizing and coding of the xM[0..12] RPE sequence
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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302 * to get the xMc[0..12]
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
303 */
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Mychaela Falconia <falcon@freecalypso.org>
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304
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Mychaela Falconia <falcon@freecalypso.org>
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305 APCM_quantization_xmaxc_to_exp_mant( xmaxc, &exp, &mant );
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Mychaela Falconia <falcon@freecalypso.org>
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306
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
307 /* This computation uses the fact that the decoded version of xmaxc
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
308 * can be calculated by using the exponent and the mantissa part of
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
309 * xmaxc (logarithmic table).
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
310 * So, this method avoids any division and uses only a scaling
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
311 * of the RPE samples by a function of the exponent. A direct
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
312 * multiplication by the inverse of the mantissa (NRFAC[0..7]
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
313 * found in table 4.5) gives the 3 bit coded version xMc[0..12]
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
314 * of the RPE samples.
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
315 */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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316
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
317 /* Direct computation of xMc[0..12] using table 4.5
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
318 */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
319
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
320 assert( exp <= 4096 && exp >= -4096);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
321 assert( mant >= 0 && mant <= 7 );
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
322
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
323 temp1 = 6 - exp; /* normalization by the exponent */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
324 temp2 = gsm_NRFAC[ mant ]; /* inverse mantissa */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
325
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
326 for (i = 0; i <= 12; i++) {
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
327 assert(temp1 >= 0 && temp1 < 16);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
328
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
329 temp = xM[i] << temp1;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
330 temp = GSM_MULT( temp, temp2 );
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
331 temp = SASR(temp, 12);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
332 xMc[i] = temp + 4; /* see note below */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
333 }
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
334
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
335 /* NOTE: This equation is used to make all the xMc[i] positive.
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
336 */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
337
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
338 *mant_out = mant;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
339 *exp_out = exp;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
340 *xmaxc_out = xmaxc;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
341 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
342
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
343 /* 4.2.16 */
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
344
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
345 static void APCM_inverse_quantization (
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
346 const word * xMc, /* [0..12] IN */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
347 word mant,
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
348 word exp,
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
349 register word * xMp) /* [0..12] OUT */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
350 /*
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Mychaela Falconia <falcon@freecalypso.org>
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351 * This part is for decoding the RPE sequence of coded xMc[0..12]
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
352 * samples to obtain the xMp[0..12] array. Table 4.6 is used to get
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
353 * the mantissa of xmaxc (FAC[0..7]).
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
354 */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
355 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
356 int i;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
357 word temp, temp1, temp2, temp3;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
358 longword ltmp;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
359
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
360 assert( mant >= 0 && mant <= 7 );
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
361
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
362 temp1 = gsm_FAC[ mant ]; /* see 4.2-15 for mant */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
363 temp2 = gsm_sub( 6, exp ); /* see 4.2-15 for exp */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
364 temp3 = gsm_asl( 1, gsm_sub( temp2, 1 ));
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
365
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
366 for (i = 13; i--;) {
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
367 assert( *xMc <= 7 && *xMc >= 0 ); /* 3 bit unsigned */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
368
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
369 /* temp = gsm_sub( *xMc++ << 1, 7 ); */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
370 temp = (*xMc++ << 1) - 7; /* restore sign */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
371 assert( temp <= 7 && temp >= -7 ); /* 4 bit signed */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
372
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
373 temp <<= 12; /* 16 bit signed */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
374 temp = GSM_MULT_R( temp1, temp );
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
375 temp = GSM_ADD( temp, temp3 );
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
376 *xMp++ = gsm_asr( temp, temp2 );
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
377 }
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
378 }
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
379
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
380 /* 4.2.17 */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
381
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
382 static void RPE_grid_positioning (
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
383 word Mc, /* grid position IN */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
384 register word * xMp, /* [0..12] IN */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
385 register word * ep /* [0..39] OUT */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
386 )
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
387 /*
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
388 * This procedure computes the reconstructed long term residual signal
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
389 * ep[0..39] for the LTP analysis filter. The inputs are the Mc
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
390 * which is the grid position selection and the xMp[0..12] decoded
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
391 * RPE samples which are upsampled by a factor of 3 by inserting zero
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
392 * values.
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
393 */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
394 {
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
395 int i = 13;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
396
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
397 assert(0 <= Mc && Mc <= 3);
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
398
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
399 switch (Mc) {
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
400 case 3: *ep++ = 0;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
401 case 2: do {
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
402 *ep++ = 0;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
403 case 1: *ep++ = 0;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
404 case 0: *ep++ = *xMp++;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
405 } while (--i);
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
406 }
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
407 while (++Mc < 4) *ep++ = 0;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
408
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
409 /*
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
410
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
411 int i, k;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
412 for (k = 0; k <= 39; k++) ep[k] = 0;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
413 for (i = 0; i <= 12; i++) {
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
414 ep[ Mc + (3*i) ] = xMp[i];
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
415 }
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
416 */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
417 }
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
418
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
419 /* 4.2.18 */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
420
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
421 /* This procedure adds the reconstructed long term residual signal
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
422 * ep[0..39] to the estimated signal dpp[0..39] from the long term
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
423 * analysis filter to compute the reconstructed short term residual
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
424 * signal dp[-40..-1]; also the reconstructed short term residual
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
425 * array dp[-120..-41] is updated.
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
426 */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
427
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
428 #if 0 /* Has been inlined in code.c */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
429 void Gsm_Update_of_reconstructed_short_time_residual_signal P3((dpp, ep, dp),
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
430 word * dpp, /* [0...39] IN */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
431 word * ep, /* [0...39] IN */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
432 word * dp) /* [-120...-1] IN/OUT */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
433 {
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
434 int k;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
435
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
436 for (k = 0; k <= 79; k++)
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
437 dp[ -120 + k ] = dp[ -80 + k ];
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
438
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
439 for (k = 0; k <= 39; k++)
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
440 dp[ -40 + k ] = gsm_add( ep[k], dpp[k] );
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
441 }
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
442 #endif /* Has been inlined in code.c */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
443
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
444 void Gsm_RPE_Encoding (
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
445 struct gsmfr_0610_state * S,
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
446
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
447 word * e, /* -5..-1][0..39][40..44 IN/OUT */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
448 word * xmaxc, /* OUT */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
449 word * Mc, /* OUT */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
450 word * xMc) /* [0..12] OUT */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
451 {
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
452 word x[40];
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
453 word xM[13], xMp[13];
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
454 word mant, exp;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
455
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
456 Weighting_filter(e, x);
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
457 RPE_grid_selection(x, xM, Mc);
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
458
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
459 APCM_quantization( xM, xMc, &mant, &exp, xmaxc);
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
460 APCM_inverse_quantization( xMc, mant, exp, xMp);
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
461
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
462 RPE_grid_positioning( *Mc, xMp, e );
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
463 }
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
464
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
465 void Gsm_RPE_Decoding (
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
466 struct gsmfr_0610_state * S,
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
467
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
468 word xmaxcr,
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
469 word Mcr,
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
470 const word * xMcr, /* [0..12], 3 bits IN */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
471 word * erp /* [0..39] OUT */
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
472 )
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
473 {
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
474 word exp, mant;
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
475 word xMp[ 13 ];
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
476
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
477 APCM_quantization_xmaxc_to_exp_mant( xmaxcr, &exp, &mant );
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
478 APCM_inverse_quantization( xMcr, mant, exp, xMp );
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
479 RPE_grid_positioning( Mcr, xMp, erp );
bee3a94f42a7 libgsmfr2: integrate rpe.c from libgsm
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
480 }