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annotate libgsmefr/pred_lt6.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 db8e0b69a6bb
children
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1 /*************************************************************************
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2 *
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3 * FUNCTION: Pred_lt_6()
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4 *
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5 * PURPOSE: Compute the result of long term prediction with fractional
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6 * interpolation of resolution 1/6. (Interpolated past excitation).
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7 *
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8 * DESCRIPTION:
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9 * The past excitation signal at the given delay is interpolated at
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10 * the given fraction to build the adaptive codebook excitation.
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11 * On return exc[0..L_subfr-1] contains the interpolated signal
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12 * (adaptive codebook excitation).
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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 "no_count.h"
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21 #include "codec.h"
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22
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23 #define UP_SAMP 6
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24 #define L_INTERPOL 10
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25 #define FIR_SIZE (UP_SAMP*L_INTERPOL+1)
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26
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27 /* 1/6 resolution interpolation filter (-3 dB at 3600 Hz) */
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28
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29 static const Word16 inter_6[FIR_SIZE] =
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30 {
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31 29443,
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32 28346, 25207, 20449, 14701, 8693, 3143,
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33 -1352, -4402, -5865, -5850, -4673, -2783,
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34 -672, 1211, 2536, 3130, 2991, 2259,
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35 1170, 0, -1001, -1652, -1868, -1666,
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36 -1147, -464, 218, 756, 1060, 1099,
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37 904, 550, 135, -245, -514, -634,
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38 -602, -451, -231, 0, 191, 308,
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39 340, 296, 198, 78, -36, -120,
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40 -163, -165, -132, -79, -19, 34,
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41 73, 91, 89, 70, 38, 0
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42 };
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43
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44 void Pred_lt_6 (
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45 Word16 exc[], /* in/out: excitation buffer */
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46 Word16 T0, /* input : integer pitch lag */
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47 Word16 frac, /* input : fraction of lag */
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48 Word16 L_subfr /* input : subframe size */
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49 )
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50 {
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51 Word16 i, j, k;
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52 Word16 *x0, *x1, *x2;
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53 const Word16 *c1, *c2;
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54 Word32 s;
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56 x0 = &exc[-T0]; move16 ();
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57
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58 frac = negate (frac);
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59 test ();
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60 if (frac < 0)
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61 {
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62 frac = add (frac, UP_SAMP);
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63 x0--;
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64 }
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65 for (j = 0; j < L_subfr; j++)
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66 {
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67 x1 = x0++; move16 ();
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68 x2 = x0; move16 ();
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69 c1 = &inter_6[frac];
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70 c2 = &inter_6[sub (UP_SAMP, frac)];
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71
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72 s = 0; move32 ();
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73 for (i = 0, k = 0; i < L_INTERPOL; i++, k += UP_SAMP)
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74 {
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75 s = L_mac (s, x1[-i], c1[k]);
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76 s = L_mac (s, x2[i], c2[k]);
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77 }
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78
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79 exc[j] = round (s); move16 ();
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80 }
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81
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82 return;
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83 }