FreeCalypso > hg > gsm-codec-lib

annotate libtwamr/enc_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 0349de7c45b7
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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363
0349de7c45b7 libtwamr: integrate enc_lag[36].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 : enc_lag6.c
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11 * Purpose : Encoding 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 * 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 "enc_lag6.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 "typedef.h"
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29 #include "basic_op.h"
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30 #include "no_count.h"
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31
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32 /*
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33 ********************************************************************************
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34 * LOCAL VARIABLES AND TABLES
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35 ********************************************************************************
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36 */
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37
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38 /*
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39 ********************************************************************************
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40 * PUBLIC PROGRAM CODE
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41 ********************************************************************************
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42 */
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43 /*************************************************************************
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44 *
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45 * FUNCTION: Enc_lag6
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46 *
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47 * PURPOSE: Encoding of fractional pitch lag with 1/6 resolution.
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48 *
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49 * DESCRIPTION:
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50 * First and third subframes:
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51 * --------------------------
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52 * The pitch range is divided as follows:
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53 * 17 3/6 to 94 3/6 resolution 1/6
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54 * 95 to 143 resolution 1
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55 *
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56 * The period is encoded with 9 bits.
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57 * For the range with fractions:
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58 * index = (T-17)*6 + frac - 3;
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59 * where T=[17..94] and frac=[-2,-1,0,1,2,3]
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60 * and for the integer only range
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61 * index = (T - 95) + 463; where T=[95..143]
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62 *
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63 * Second and fourth subframes:
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64 * ----------------------------
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65 * For the 2nd and 4th subframes a resolution of 1/6 is always used,
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66 * and the search range is relative to the lag in previous subframe.
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67 * If t0 is the lag in the previous subframe then
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68 * t_min=t0-5 and t_max=t0+4 and the range is given by
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69 * (t_min-1) 3/6 to (t_max) 3/6
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70 *
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71 * The period in the 2nd (and 4th) subframe is encoded with 6 bits:
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72 * index = (T-(t_min-1))*6 + frac - 3;
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73 * where T=[t_min-1..t_max] and frac=[-2,-1,0,1,2,3]
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74 *
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75 * Note that only 61 values are used. If the decoder receives 61, 62,
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76 * or 63 as the relative pitch index, it means that a transmission
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77 * error occurred and the pitch from previous subframe should be used.
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78 *
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79 *************************************************************************/
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80 Word16 Enc_lag6 ( /* o : Return index of encoding */
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81 Word16 T0, /* i : Pitch delay */
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82 Word16 T0_frac, /* i : Fractional pitch delay */
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83 Word16 T0_min, /* i : minimum of search range */
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84 Word16 delta_flag /* i : Flag for 1st (or 3rd) subframe */
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85 )
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86 {
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87 Word16 index, i;
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88
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89 test ();
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90 if (delta_flag == 0) /* if 1st or 3rd subframe */
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91 {
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92 /* encode pitch delay (with fraction) */
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93 test ();
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94 if (sub (T0, 94) <= 0)
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95 {
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96 /* index = T0*6 - 105 + T0_frac */
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97 i = add (add (T0, T0), T0);
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98 index = add (sub (add (i, i), 105), T0_frac);
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99 }
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100 else
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101 {
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102 index = add (T0, 368);
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103 }
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104
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105 }
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106 else
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107 /* if second or fourth subframe */
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108 {
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109 /* index = 6*(T0-T0_min) + 3 + T0_frac */
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110 i = sub (T0, T0_min);
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111 i = add (add (i, i), i);
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112 index = add (add (add (i, i), 3), T0_frac);
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113 }
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114
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115 return index;
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116 }