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annotate libtwamr/dec_lag6.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 7bea058d0640
children
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7bea058d0640 libtwamr: integrate dec_lag6.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 : dec_lag6.c
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11 * Purpose : Decoding of fractional pitch lag with 1/6 resolution.
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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 /*
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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 "dec_lag6.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 "no_count.h"
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33
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34 /*
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35 ********************************************************************************
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36 * PUBLIC PROGRAM CODE
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37 ********************************************************************************
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38 */
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39 /*
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40 ************************************************************************
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41 * FUNCTION: Dec_lag6
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42 *
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43 * PURPOSE: Decoding of fractional pitch lag with 1/6 resolution.
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44 * Extract the integer and fraction parts of the pitch lag from
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45 * the received adaptive codebook index.
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46 *
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47 * See "Enc_lag6.c" for more details about the encoding procedure.
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48 *
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49 * The fractional lag in 1st and 3rd subframes is encoded with 9 bits
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50 * while that in 2nd and 4th subframes is relatively encoded with 6 bits.
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51 * Note that in relative encoding only 61 values are used. If the
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52 * decoder receives 61, 62, or 63 as the relative pitch index, it means
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53 * that a transmission error occurred. In this case, the pitch lag from
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54 * previous subframe (actually from previous frame) is used.
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55 *
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56 ************************************************************************
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57 */
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58 void Dec_lag6 (
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59 Word16 index, /* input : received pitch index */
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60 Word16 pit_min, /* input : minimum pitch lag */
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61 Word16 pit_max, /* input : maximum pitch lag */
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62 Word16 i_subfr, /* input : subframe flag */
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63 Word16 *T0, /* in/out: integer part of pitch lag */
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64 Word16 *T0_frac /* output: fractional part of pitch lag */
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65 )
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66 {
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67 Word16 i;
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68 Word16 T0_min, T0_max;
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69
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70 test ();
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71 if (i_subfr == 0) /* if 1st or 3rd subframe */
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72 {
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73 test ();
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74 if (sub (index, 463) < 0)
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75 {
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76 /* T0 = (index+5)/6 + 17 */
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77 *T0 = add (mult (add (index, 5), 5462), 17);
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78 i = add (add (*T0, *T0), *T0);
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79 /* *T0_frac = index - T0*6 + 105 */
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80 *T0_frac = add (sub (index, add (i, i)), 105);
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81 move16 ();
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82 }
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83 else
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84 {
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85 *T0 = sub (index, 368);
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86 *T0_frac = 0; move16 ();
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87 }
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88 }
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89 else
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90 /* second or fourth subframe */
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91 {
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92 /* find T0_min and T0_max for 2nd (or 4th) subframe */
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93
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94 T0_min = sub (*T0, 5);
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95
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96 test ();
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97 if (sub (T0_min, pit_min) < 0)
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98 {
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99 T0_min = pit_min; move16 ();
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100 }
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101 T0_max = add (T0_min, 9);
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102
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103 test ();
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104 if (sub (T0_max, pit_max) > 0)
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105 {
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106 T0_max = pit_max; move16 ();
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107 T0_min = sub (T0_max, 9);
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108 }
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109
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110 /* i = (index+5)/6 - 1 */
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111 i = sub (mult (add (index, 5), 5462), 1);
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112 *T0 = add (i, T0_min);
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113 i = add (add (i, i), i);
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114 *T0_frac = sub (sub (index, 3), add (i, i));
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115 move16 ();
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116 }
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117 }