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annotate libtwamr/lsfwt.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 8861f41e4507
children
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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 : lsfwt.c
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11 * Purpose : Compute LSF weighting factors
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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 * MODULE INCLUDE FILE AND VERSION ID
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19 ********************************************************************************
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20 */
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21 #include "namespace.h"
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22 #include "lsfwt.h"
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23
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24 /*
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25 ********************************************************************************
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26 * INCLUDE FILES
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27 ********************************************************************************
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28 */
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29 #include "typedef.h"
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30 #include "basic_op.h"
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31 #include "no_count.h"
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32 #include "cnst.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 Lsf_wt *
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42 * *
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43 ****************************************************
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44 * Compute LSF weighting factors *
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45 * *
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46 * d[i] = lsf[i+1] - lsf[i-1] *
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47 * *
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48 * The weighting factors are approximated by two line segment. *
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49 * *
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50 * First segment passes by the following 2 points: *
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51 * *
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52 * d[i] = 0Hz wf[i] = 3.347 *
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53 * d[i] = 450Hz wf[i] = 1.8 *
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54 * *
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55 * Second segment passes by the following 2 points: *
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56 * *
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57 * d[i] = 450Hz wf[i] = 1.8 *
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58 * d[i] = 1500Hz wf[i] = 1.0 *
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59 * *
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60 * if( d[i] < 450Hz ) *
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61 * wf[i] = 3.347 - ( (3.347-1.8) / (450-0)) * d[i] *
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62 * else *
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63 * wf[i] = 1.8 - ( (1.8-1.0) / (1500-450)) * (d[i] - 450) *
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64 * *
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65 * *
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66 * if( d[i] < 1843) *
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67 * wf[i] = 3427 - (28160*d[i])>>15 *
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68 * else *
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69 * wf[i] = 1843 - (6242*(d[i]-1843))>>15 *
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70 * *
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71 *--------------------------------------------------------------------------*/
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72
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73 void Lsf_wt (
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74 Word16 *lsf, /* input : LSF vector */
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75 Word16 *wf) /* output: square of weighting factors */
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76 {
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77 Word16 temp;
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78 Word16 i;
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79 /* wf[0] = lsf[1] - 0 */
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80 wf[0] = lsf[1]; move16 ();
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81 for (i = 1; i < 9; i++)
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82 {
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83 wf[i] = sub (lsf[i + 1], lsf[i - 1]); move16 ();
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84 }
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85 /* wf[9] = 0.5 - lsf[8] */
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86 wf[9] = sub (16384, lsf[8]);move16 ();
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87
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88 for (i = 0; i < 10; i++)
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89 {
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90 temp = sub (wf[i], 1843);
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91 test ();
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92 if (temp < 0)
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93 {
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94 wf[i] = sub (3427, mult (wf[i], 28160)); move16 ();
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95 }
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96 else
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97 {
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98 wf[i] = sub (1843, mult (temp, 6242)); move16 ();
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99 }
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100
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101 wf[i] = shl (wf[i], 3); move16 ();
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102 }
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103 return;
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104 }