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annotate libtwamr/hp_max.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 176a44ff94a1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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176a44ff94a1 libtwamr: integrate hp_max.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 : hp_max.c
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11 * Purpose : Find the maximum correlation of scal_sig[] in a given
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12 * delay range.
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13 *
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14 ********************************************************************************
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15 */
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16
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17 /*
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18 ********************************************************************************
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19 * MODULE INCLUDE FILE AND VERSION ID
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20 ********************************************************************************
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21 */
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22 #include "namespace.h"
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23 #include "hp_max.h"
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24
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25 /*
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26 ********************************************************************************
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27 * INCLUDE FILES
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28 ********************************************************************************
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29 */
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30 #include "typedef.h"
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31 #include "basic_op.h"
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32 #include "oper_32b.h"
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33 #include "no_count.h"
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34 #include "cnst.h"
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35
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36 /*
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37 ********************************************************************************
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38 * PUBLIC PROGRAM CODE
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39 ********************************************************************************
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40 */
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41 Word16 hp_max (
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42 Word32 corr[], /* i : correlation vector. */
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43 Word16 scal_sig[], /* i : scaled signal. */
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44 Word16 L_frame, /* i : length of frame to compute pitch */
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45 Word16 lag_max, /* i : maximum lag */
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46 Word16 lag_min, /* i : minimum lag */
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47 Word16 *cor_hp_max) /* o : max high-pass filtered norm. correlation */
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48 {
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49 Word16 i;
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50 Word16 *p, *p1;
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51 Word32 max, t0, t1;
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52 Word16 max16, t016, cor_max;
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53 Word16 shift, shift1, shift2;
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54
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55 max = MIN_32; move32 ();
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56 t0 = 0L; move32 ();
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57
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58 for (i = lag_max-1; i > lag_min; i--)
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59 {
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60 /* high-pass filtering */
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61 t0 = L_sub (L_sub(L_shl(corr[-i], 1), corr[-i-1]), corr[-i+1]);
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62 t0 = L_abs (t0);
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63
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64 test ();
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65 if (L_sub (t0, max) >= 0)
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66 {
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67 max = t0; move32 ();
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68 }
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69 }
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70
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71 /* compute energy */
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72 p = scal_sig; move16 ();
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73 p1 = &scal_sig[0]; move16 ();
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74 t0 = 0L; move32 ();
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75 for (i = 0; i < L_frame; i++, p++, p1++)
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76 {
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77 t0 = L_mac (t0, *p, *p1);
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78 }
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79
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80 p = scal_sig; move16 ();
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81 p1 = &scal_sig[-1]; move16 ();
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82 t1 = 0L; move32 ();
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83 for (i = 0; i < L_frame; i++, p++, p1++)
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84 {
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85 t1 = L_mac (t1, *p, *p1);
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86 }
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87
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88 /* high-pass filtering */
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89 t0 = L_sub(L_shl(t0, 1), L_shl(t1, 1));
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90 t0 = L_abs (t0);
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91
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92 /* max/t0 */
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93 shift1 = sub(norm_l(max), 1);
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94 max16 = extract_h(L_shl(max, shift1));
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95 shift2 = norm_l(t0);
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96 t016 = extract_h(L_shl(t0, shift2));
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97
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98 test ();
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99 if (t016 != 0)
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100 {
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101 cor_max = div_s(max16, t016);
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102 }
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103 else
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104 {
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105 cor_max = 0; move16 ();
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106 }
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107
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108 shift = sub(shift1, shift2);
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109
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110 test ();
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111 if (shift >= 0)
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112 {
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113 *cor_hp_max = shr(cor_max, shift); move16 (); /* Q15 */
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114 }
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115 else
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116 {
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117 *cor_hp_max = shl(cor_max, negate(shift)); move16 (); /* Q15 */
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118 }
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119
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120 return 0;
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121 }