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annotate libtwamr/q_gain_p.c @ 585:3c6bf0d26ee7 default tip

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TW-TS-005 reader: fix maximum line length bug TW-TS-005 section 4.1 states: The maximum allowed length of each line is 80 characters, not including the OS-specific newline encoding. The implementation of this line length limit in the TW-TS-005 hex file reader function in the present suite was wrong, such that lines of the full maximum length could not be read. Fix it. Note that this bug affects comment lines too, not just actual RTP payloads. Neither Annex A nor Annex B features an RTP payload format that goes to the maximum of 40 bytes, but if a comment line goes to the maximum allowed length of 80 characters not including the terminating newline, the bug will be triggered, necessitating the present fix.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 25 Feb 2025 07:49:28 +0000
parents a01de4e40540
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 }