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annotate libgsmfr2/preprocess.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 bd2271cb95d4
children
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1 /*
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2 * This C source file has been adapted from TU-Berlin libgsm source,
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3 * original notice follows:
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4 *
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5 * Copyright 1992 by Jutta Degener and Carsten Bormann, Technische
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6 * Universitaet Berlin. See the accompanying file "COPYRIGHT" for
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7 * details. THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
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8 */
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9
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10 #include <stdint.h>
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11 #include <assert.h>
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12 #include "tw_gsmfr.h"
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13 #include "typedef.h"
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14 #include "ed_state.h"
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15 #include "ed_internal.h"
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16
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17 /* 4.2.0 .. 4.2.3 PREPROCESSING SECTION
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18 *
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19 * After A-law to linear conversion (or directly from the
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20 * Ato D converter) the following scaling is assumed for
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21 * input to the RPE-LTP algorithm:
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22 *
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23 * in: 0.1.....................12
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24 * S.v.v.v.v.v.v.v.v.v.v.v.v.*.*.*
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25 *
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26 * Where S is the sign bit, v a valid bit, and * a "don't care" bit.
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27 * The original signal is called sop[..]
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28 *
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29 * out: 0.1................... 12
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30 * S.S.v.v.v.v.v.v.v.v.v.v.v.v.0.0
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31 */
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32
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33 void Gsm_Preprocess (
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34 struct gsmfr_0610_state * S,
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35 const word * s,
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36 word * so ) /* [0..159] IN/OUT */
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37 {
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38
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39 word z1 = S->z1;
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40 longword L_z2 = S->L_z2;
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41 word mp = S->mp;
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42
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43 word s1;
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44 longword L_s2;
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45
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46 longword L_temp;
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47
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48 word msp, lsp;
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49 word SO;
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50
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51 longword ltmp; /* for ADD */
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52 ulongword utmp; /* for L_ADD */
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53
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54 register int k = 160;
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55
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56 while (k--) {
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57
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58 /* 4.2.1 Downscaling of the input signal
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59 */
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60 SO = SASR( *s, 3 ) << 2;
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61 s++;
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62
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63 assert (SO >= -0x4000); /* downscaled by */
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64 assert (SO <= 0x3FFC); /* previous routine. */
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65
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66
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67 /* 4.2.2 Offset compensation
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68 *
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69 * This part implements a high-pass filter and requires extended
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70 * arithmetic precision for the recursive part of this filter.
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71 * The input of this procedure is the array so[0...159] and the
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72 * output the array sof[ 0...159 ].
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73 */
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74 /* Compute the non-recursive part
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75 */
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76
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77 s1 = SO - z1; /* s1 = gsm_sub( *so, z1 ); */
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78 z1 = SO;
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79
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80 assert(s1 != MIN_WORD);
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81
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82 /* Compute the recursive part
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83 */
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84 L_s2 = s1;
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85 L_s2 <<= 15;
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86
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87 /* Execution of a 31 bv 16 bits multiplication
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88 */
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89
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90 msp = SASR( L_z2, 15 );
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91 lsp = L_z2-((longword)msp<<15); /* gsm_L_sub(L_z2,(msp<<15)); */
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92
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93 L_s2 += GSM_MULT_R( lsp, 32735 );
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94 L_temp = (longword)msp * 32735; /* GSM_L_MULT(msp,32735) >> 1;*/
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95 L_z2 = GSM_L_ADD( L_temp, L_s2 );
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96
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97 /* Compute sof[k] with rounding
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98 */
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99 L_temp = GSM_L_ADD( L_z2, 16384 );
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100
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101 /* 4.2.3 Preemphasis
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102 */
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103
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104 msp = GSM_MULT_R( mp, -28180 );
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105 mp = SASR( L_temp, 15 );
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106 *so++ = GSM_ADD( mp, msp );
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107 }
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108
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109 S->z1 = z1;
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110 S->L_z2 = L_z2;
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111 S->mp = mp;
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112 }