FreeCalypso > hg > gsm-codec-lib

annotate libtwamr/enc_lag3.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_lag3.c
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11 * Purpose : Encoding of fractional pitch lag with 1/3 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_lag3.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 #include "cnst.h"
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32
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33 /*
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34 ********************************************************************************
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35 * PUBLIC PROGRAM CODE
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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 * FUNCTION: Enc_lag3
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41 *
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42 * PURPOSE: Encoding of fractional pitch lag with 1/3 resolution.
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43 *
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44 * DESCRIPTION:
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45 * First and third subframes:
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46 * --------------------------
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47 * The pitch range is divided as follows:
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48 * 19 1/3 to 84 2/3 resolution 1/3
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49 * 85 to 143 resolution 1
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50 *
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51 * The period is encoded with 8 bits.
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52 * For the range with fractions:
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53 * index = (T-19)*3 + frac - 1;
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54 * where T=[19..85] and frac=[-1,0,1]
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55 * and for the integer only range
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56 * index = (T - 85) + 197; where T=[86..143]
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57 *
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58 * Second and fourth subframes:
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59 * ----------------------------
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60 * For the 2nd and 4th subframes a resolution of 1/3 is always used,
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61 * and the search range is relative to the lag in previous subframe.
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62 * If t0 is the lag in the previous subframe then
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63 * t_min=t0-5 and t_max=t0+4 and the range is given by
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64 * t_min - 2/3 to t_max + 2/3
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65 *
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66 * The period in the 2nd (and 4th) subframe is encoded with 5 bits:
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67 * index = (T-(t_min-1))*3 + frac - 1;
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68 * where T=[t_min-1..t_max+1]
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69 *
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70 *************************************************************************/
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71 Word16
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72 Enc_lag3( /* o : Return index of encoding */
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73 Word16 T0, /* i : Pitch delay */
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74 Word16 T0_frac, /* i : Fractional pitch delay */
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75 Word16 T0_prev, /* i : Integer pitch delay of last subframe */
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76 Word16 T0_min, /* i : minimum of search range */
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77 Word16 T0_max, /* i : maximum of search range */
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78 Word16 delta_flag, /* i : Flag for 1st (or 3rd) subframe */
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79 Word16 flag4 /* i : Flag for encoding with 4 bits */
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80 )
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81 {
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82 Word16 index, i, tmp_ind, uplag;
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83 Word16 tmp_lag;
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84
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85 test ();
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86 if (delta_flag == 0)
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87 { /* if 1st or 3rd subframe */
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88
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89 /* encode pitch delay (with fraction) */
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90
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91 test ();
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92 if (sub (T0, 85) <= 0)
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93 {
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94 /* index = T0*3 - 58 + T0_frac */
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95 i = add (add (T0, T0), T0);
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96 index = add (sub (i, 58), T0_frac);
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97 }
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98 else
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99 {
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100 index = add (T0, 112);
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101 }
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102 }
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103 else
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104 { /* if second or fourth subframe */
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105 test ();
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106 if (flag4 == 0) {
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107
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108 /* 'normal' encoding: either with 5 or 6 bit resolution */
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109
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110 /* index = 3*(T0 - T0_min) + 2 + T0_frac */
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111 i = sub (T0, T0_min);
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112 i = add (add (i, i), i);
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113 index = add (add (i, 2), T0_frac);
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114 }
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115 else {
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116
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117 /* encoding with 4 bit resolution */
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118
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119 tmp_lag = T0_prev; move16 ();
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120
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121 test ();
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122 if ( sub( sub(tmp_lag, T0_min), 5) > 0)
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123 tmp_lag = add (T0_min, 5);
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124 test ();
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125 if ( sub( sub(T0_max, tmp_lag), 4) > 0)
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126 tmp_lag = sub (T0_max, 4);
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127
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128 uplag = add (add (add (T0, T0), T0), T0_frac);
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129
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130 i = sub (tmp_lag, 2);
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131 tmp_ind = add (add (i, i), i);
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132
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133 test ();
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134 if (sub (tmp_ind, uplag) >= 0) {
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135 index = add (sub (T0, tmp_lag), 5);
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parents:
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136 }
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137 else
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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138 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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139 i = add (tmp_lag, 1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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140 i = add (add (i, i), i);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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141
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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142 test ();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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143 if (sub (i, uplag) > 0) {
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parents:
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144 index = add ( sub (uplag, tmp_ind), 3);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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145 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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146 else {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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147 index = add (sub (T0, tmp_lag), 11);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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148 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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149 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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150
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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151 } /* end if (encoding with 4 bit resolution) */
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parents:
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152 } /* end if (second of fourth subframe) */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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153
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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154 return index;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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155 }