FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/autocorr.c @ 585:3c6bf0d26ee7 default tip
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> |
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date | Tue, 25 Feb 2025 07:49:28 +0000 |
parents | 92dc7f0082a3 |
children |
rev | line source |
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1 /************************************************************************* |
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2 * |
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3 * FUNCTION: autocorr |
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4 * |
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5 * PURPOSE: Compute autocorrelations of signal with windowing |
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6 * |
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7 * DESCRIPTION: |
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8 * - Windowing of input speech: s'[n] = s[n] * w[n] |
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9 * - Autocorrelations of input speech: |
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10 * r[k] = sum_{i=k}^{239} s'[i]*s'[i-k] k=0,...,10 |
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11 * The autocorrelations are expressed in normalized double precision |
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12 * format. |
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13 * |
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14 *************************************************************************/ |
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15 |
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16 #include "gsm_efr.h" |
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17 #include "typedef.h" |
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18 #include "namespace.h" |
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19 #include "basic_op.h" |
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20 #include "oper_32b.h" |
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21 #include "no_count.h" |
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22 #include "cnst.h" |
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23 #include "sig_proc.h" |
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24 |
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25 Word16 Autocorr ( |
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26 Word16 x[], /* (i) : Input signal */ |
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27 Word16 m, /* (i) : LPC order */ |
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28 Word16 r_h[], /* (o) : Autocorrelations (msb) */ |
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29 Word16 r_l[], /* (o) : Autocorrelations (lsb) */ |
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30 const Word16 wind[] /* (i) : window for LPC analysis */ |
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31 ) |
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32 { |
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33 Word16 i, j, norm; |
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34 Word16 y[L_WINDOW]; |
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35 Word32 sum; |
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36 Word16 overfl, overfl_shft; |
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37 |
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38 /* Windowing of signal */ |
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39 |
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40 for (i = 0; i < L_WINDOW; i++) |
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41 { |
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42 y[i] = mult_r (x[i], wind[i]); move16 (); |
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43 } |
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44 |
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45 /* Compute r[0] and test for overflow */ |
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46 |
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47 overfl_shft = 0; move16 (); |
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48 |
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49 do |
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50 { |
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51 overfl = 0; move16 (); |
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52 sum = 0L; move32 (); |
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53 |
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54 for (i = 0; i < L_WINDOW; i++) |
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55 { |
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56 sum = L_mac (sum, y[i], y[i]); |
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57 } |
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58 |
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59 /* If overflow divide y[] by 4 */ |
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60 |
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61 test (); |
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62 if (L_sub (sum, MAX_32) == 0L) |
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63 { |
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64 overfl_shft = add (overfl_shft, 4); |
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65 overfl = 1; move16 (); /* Set the overflow flag */ |
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66 |
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67 for (i = 0; i < L_WINDOW; i++) |
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68 { |
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69 y[i] = shr (y[i], 2); move16 (); |
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70 } |
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71 } |
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72 test (); |
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73 } |
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74 while (overfl != 0); |
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75 |
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76 sum = L_add (sum, 1L); /* Avoid the case of all zeros */ |
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77 |
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78 /* Normalization of r[0] */ |
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79 |
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80 norm = norm_l (sum); |
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81 sum = L_shl (sum, norm); |
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82 L_Extract (sum, &r_h[0], &r_l[0]); /* Put in DPF format (see oper_32b) */ |
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83 |
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84 /* r[1] to r[m] */ |
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85 |
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86 for (i = 1; i <= m; i++) |
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87 { |
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88 sum = 0; move32 (); |
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89 |
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90 for (j = 0; j < L_WINDOW - i; j++) |
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91 { |
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92 sum = L_mac (sum, y[j], y[j + i]); |
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93 } |
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94 |
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95 sum = L_shl (sum, norm); |
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96 L_Extract (sum, &r_h[i], &r_l[i]); |
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97 } |
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98 |
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99 norm = sub (norm, overfl_shft); |
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100 |
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101 return norm; |
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102 } |