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annotate libgsmefr/lsp_az.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 5bc228bb421e
children
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1 /*************************************************************************
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2 *
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3 * FUNCTION: Lsp_Az
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4 *
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5 * PURPOSE: Converts from the line spectral pairs (LSP) to
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6 * LP coefficients, for a 10th order filter.
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7 *
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8 * DESCRIPTION:
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9 * - Find the coefficients of F1(z) and F2(z) (see Get_lsp_pol)
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10 * - Multiply F1(z) by 1+z^{-1} and F2(z) by 1-z^{-1}
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11 * - A(z) = ( F1(z) + F2(z) ) / 2
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12 *
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13 *************************************************************************/
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14
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15 #include "gsm_efr.h"
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16 #include "typedef.h"
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17 #include "namespace.h"
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18 #include "basic_op.h"
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19 #include "oper_32b.h"
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20 #include "no_count.h"
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21 #include "sig_proc.h"
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22
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23 /* local function */
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24
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25 static void Get_lsp_pol (Word16 *lsp, Word32 *f);
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26
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27 void Lsp_Az (
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28 Word16 lsp[], /* (i) : line spectral frequencies */
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29 Word16 a[] /* (o) : predictor coefficients (order = 10) */
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30 )
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31 {
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32 Word16 i, j;
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33 Word32 f1[6], f2[6];
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34 Word32 t0;
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35
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36 Get_lsp_pol (&lsp[0], f1);
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37 Get_lsp_pol (&lsp[1], f2);
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38
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39 for (i = 5; i > 0; i--)
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40 {
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41 f1[i] = L_add (f1[i], f1[i - 1]); move32 (); /* f1[i] += f1[i-1]; */
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42 f2[i] = L_sub (f2[i], f2[i - 1]); move32 (); /* f2[i] -= f2[i-1]; */
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43 }
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45 a[0] = 4096; move16 ();
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46 for (i = 1, j = 10; i <= 5; i++, j--)
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47 {
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48 t0 = L_add (f1[i], f2[i]); /* f1[i] + f2[i] */
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49 a[i] = extract_l (L_shr_r (t0, 13)); move16 ();
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50 t0 = L_sub (f1[i], f2[i]); /* f1[i] - f2[i] */
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51 a[j] = extract_l (L_shr_r (t0, 13)); move16 ();
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52 }
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53
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54 return;
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55 }
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56
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57 /*************************************************************************
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58 *
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59 * FUNCTION: Get_lsp_pol
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60 *
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61 * PURPOSE: Find the polynomial F1(z) or F2(z) from the LSPs.
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62 * If the LSP vector is passed at address 0 F1(z) is computed
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63 * and if it is passed at address 1 F2(z) is computed.
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64 *
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65 * DESCRIPTION:
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66 * This is performed by expanding the product polynomials:
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67 *
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68 * F1(z) = product ( 1 - 2 lsp[i] z^-1 + z^-2 )
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69 * i=0,2,4,6,8
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70 * F2(z) = product ( 1 - 2 lsp[i] z^-1 + z^-2 )
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71 * i=1,3,5,7,9
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72 *
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73 * where lsp[] is the LSP vector in the cosine domain.
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74 *
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75 * The expansion is performed using the following recursion:
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76 *
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77 * f[0] = 1
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78 * b = -2.0 * lsp[0]
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79 * f[1] = b
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80 * for i=2 to 5 do
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81 * b = -2.0 * lsp[2*i-2];
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82 * f[i] = b*f[i-1] + 2.0*f[i-2];
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83 * for j=i-1 down to 2 do
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84 * f[j] = f[j] + b*f[j-1] + f[j-2];
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85 * f[1] = f[1] + b;
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86 *
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87 *************************************************************************/
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88
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89 static void Get_lsp_pol (Word16 *lsp, Word32 *f)
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90 {
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91 Word16 i, j, hi, lo;
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92 Word32 t0;
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93
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94 /* f[0] = 1.0; */
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95 *f = L_mult (4096, 2048); move32 ();
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96 f++; move32 ();
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97 *f = L_msu ((Word32) 0, *lsp, 512); /* f[1] = -2.0 * lsp[0]; */
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98 f++; move32 ();
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99 lsp += 2; /* Advance lsp pointer */
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100
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101 for (i = 2; i <= 5; i++)
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102 {
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103 *f = f[-2]; move32 ();
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104
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105 for (j = 1; j < i; j++, f--)
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106 {
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107 L_Extract (f[-1], &hi, &lo);
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108 t0 = Mpy_32_16 (hi, lo, *lsp); /* t0 = f[-1] * lsp */
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109 t0 = L_shl (t0, 1);
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110 *f = L_add (*f, f[-2]); move32 (); /* *f += f[-2] */
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111 *f = L_sub (*f, t0);move32 (); /* *f -= t0 */
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112 }
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113 *f = L_msu (*f, *lsp, 512); move32 (); /* *f -= lsp<<9 */
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114 f += i; /* Advance f pointer */
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115 lsp += 2; /* Advance lsp pointer */
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116 }
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117
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118 return;
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119 }