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annotate libtwamr/int_lsf.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 693ea1d5cf1e
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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693ea1d5cf1e libtwamr: integrate int_lsf.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 : int_lsf.c
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11 *
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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 * MODULE INCLUDE FILE AND VERSION ID
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17 ********************************************************************************
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18 */
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19 #include "namespace.h"
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20 #include "int_lsf.h"
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21
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22 /*
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23 ********************************************************************************
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24 * INCLUDE FILES
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25 ********************************************************************************
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26 */
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27 #include "typedef.h"
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28 #include "basic_op.h"
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29 #include "no_count.h"
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30 #include "cnst.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 * Constants (defined in cnst.h) *
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40 *--------------------------------------*
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41 * M : LSF order *
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42 *--------------------------------------*
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43 */
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44
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45 /*
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46 ********************************************************************************
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47 * PUBLIC PROGRAM CODE
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48 ********************************************************************************
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49 */
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50
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51 /*
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52 **************************************************************************
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53 *
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54 * Function : Int_lsf
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55 * Purpose : Interpolates the LSFs for selected subframe
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56 * Description : The 20 ms speech frame is divided into 4 subframes.
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57 * The LSFs are interpolated at the 1st, 2nd and 3rd
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58 * subframe and only forwarded at the 4th subframe.
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59 *
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60 * |------|------|------|------|
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61 * sf1 sf2 sf3 sf4
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62 * F0 F1
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63 *
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64 * sf1: 3/4 F0 + 1/4 F1 sf3: 1/4 F0 + 3/4 F1
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65 * sf2: 1/2 F0 + 1/2 F1 sf4: F1
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66 * Returns : void
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67 *
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68 **************************************************************************
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69 */
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70 void Int_lsf(
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71 Word16 lsf_old[], /* i : LSF vector at the 4th SF of past frame */
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72 Word16 lsf_new[], /* i : LSF vector at the 4th SF of present frame */
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73 Word16 i_subfr, /* i : Pointer to current sf (equal to 0,40,80 or 120) */
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74 Word16 lsf_out[] /* o : interpolated LSF parameters for current sf */
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75 )
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76 {
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77 Word16 i;
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78
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79 if ( i_subfr == 0 )
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80 {
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81 test ();
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82 for (i = 0; i < M; i++) {
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83 lsf_out[i] = add(sub(lsf_old[i], shr(lsf_old[i], 2)), shr(lsf_new[i], 2));
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84 move16 ();
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85 }
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86 }
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87 else if ( sub(i_subfr, 40) == 0 )
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88 {
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89 test (); test ();
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90 for (i = 0; i < M; i++) {
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91 lsf_out[i] = add(shr(lsf_old[i],1), shr(lsf_new[i], 1) );
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92 move16 ();
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93 }
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94 }
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95 else if ( sub(i_subfr, 80) == 0 )
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96 {
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97 test (); test (); test ();
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98 for (i = 0; i < M; i++) {
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99 lsf_out[i] = add(shr(lsf_old[i], 2), sub(lsf_new[i], shr(lsf_new[i], 2)));
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100 move16 ();
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101 }
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102 }
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103 else if ( sub(i_subfr, 120) == 0 )
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104 {
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105 test (); test (); test (); test ();
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106 for (i = 0; i < M; i++) {
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107 lsf_out[i] = lsf_new[i]; move16 ();
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108 }
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109 }
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110
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111 return;
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112 }