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annotate libtwamr/q_gain_p.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 a01de4e40540
children
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a01de4e40540 libtwamr: integrate q_gain_p.c
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1 /*
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2 ********************************************************************************
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3 *
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4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
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5 * R99 Version 3.3.0
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6 * REL-4 Version 4.1.0
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7 *
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8 ********************************************************************************
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9 *
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10 * File : q_gain_p.c
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11 * Purpose : Scalar quantization of the pitch gain
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12 *
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13 ********************************************************************************
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14 */
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15 /*
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16 ********************************************************************************
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17 * MODULE INCLUDE FILE AND VERSION ID
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18 ********************************************************************************
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19 */
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20 #include "namespace.h"
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21 #include "q_gain_p.h"
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22
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23 /*
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24 ********************************************************************************
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25 * INCLUDE FILES
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26 ********************************************************************************
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27 */
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28 #include "tw_amr.h"
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29 #include "typedef.h"
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30 #include "basic_op.h"
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31 #include "oper_32b.h"
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32 #include "no_count.h"
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33 #include "cnst.h"
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34 #include "gains_tab.h"
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35
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36 /*
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37 ********************************************************************************
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38 * PUBLIC PROGRAM CODE
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39 ********************************************************************************
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40 */
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41 Word16 q_gain_pitch ( /* Return index of quantization */
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42 enum Mode mode, /* i : AMR mode */
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43 Word16 gp_limit, /* i : pitch gain limit */
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44 Word16 *gain, /* i/o: Pitch gain (unquant/quant), Q14 */
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45 Word16 gain_cand[], /* o : pitch gain candidates (3), MR795 only, Q14 */
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46 Word16 gain_cind[] /* o : pitch gain cand. indices (3),MR795 only, Q0 */
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47 )
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48 {
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49 Word16 i, index, err, err_min;
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50
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51 err_min = abs_s (sub (*gain, qua_gain_pitch[0]));
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52 index = 0; move16 ();
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53
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54 for (i = 1; i < NB_QUA_PITCH; i++)
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55 {
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56 test ();
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57 if (sub (qua_gain_pitch[i], gp_limit) <= 0)
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58 {
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59 err = abs_s (sub (*gain, qua_gain_pitch[i]));
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60
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61 test ();
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62 if (sub (err, err_min) < 0)
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63 {
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64 err_min = err; move16 ();
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65 index = i; move16 ();
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66 }
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67 }
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68 }
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69
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70 test ();
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71 if (sub (mode, MR795) == 0)
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72 {
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73 /* in MR795 mode, compute three gain_pit candidates around the index
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74 * found in the quantization loop: the index found and the two direct
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75 * neighbours, except for the extreme cases (i=0 or i=NB_QUA_PITCH-1),
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76 * where the direct neighbour and the neighbour to that is used.
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77 */
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78 Word16 ii;
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79
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80 test ();
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81 if (index == 0)
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82 {
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83 ii = index; move16 ();
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84 }
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85 else
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86 {
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87 test (); test ();
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88 if ( sub (index, NB_QUA_PITCH-1) == 0
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89 || sub (qua_gain_pitch[index+1], gp_limit) > 0)
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90 {
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91 ii = sub (index, 2);
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92 }
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93 else
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94 {
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95 ii = sub (index, 1);
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96 }
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97 }
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98
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99 /* store candidate indices and values */
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100 for (i = 0; i < 3; i++)
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101 {
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102 gain_cind[i] = ii; move16 ();
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103 gain_cand[i] = qua_gain_pitch[ii]; move16 ();
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104 ii = add (ii, 1);
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105 }
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106
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107 *gain = qua_gain_pitch[index]; move16 ();
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108 }
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109 else
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110 {
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111 /* in MR122 mode, just return the index and gain pitch found.
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112 * If bitexactness is required, mask away the two LSBs (because
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113 * in the original EFR, gain_pit was scaled Q12)
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114 */
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115 test ();
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116 if (sub(mode, MR122) == 0)
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117 {
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118 /* clear 2 LSBits */
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119 *gain = qua_gain_pitch[index] & 0xFFFC; logic16 (); move16 ();
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120 }
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121 else
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122 {
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123 *gain = qua_gain_pitch[index]; move16 ();
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124 }
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125 }
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126 return index;
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127 }