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annotate libgsmefr/pre_proc.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 3ea19a9aa2a1
children
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1 /*************************************************************************
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2 *
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3 * FUNCTION: Pre_Process()
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4 *
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5 * PURPOSE: Preprocessing of input speech.
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6 *
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7 * DESCRIPTION:
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8 * - 2nd order high pass filtering with cut off frequency at 80 Hz.
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9 * - Divide input by two.
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10 *
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11 *************************************************************************/
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12
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13 #include "gsm_efr.h"
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14 #include "typedef.h"
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15 #include "namespace.h"
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16 #include "basic_op.h"
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17 #include "oper_32b.h"
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18 #include "no_count.h"
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19 #include "sig_proc.h"
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20 #include "cnst.h"
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21 #include "enc_state.h"
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22
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23 /*------------------------------------------------------------------------*
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24 * *
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25 * Algorithm: *
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26 * *
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27 * y[i] = b[0]*x[i]/2 + b[1]*x[i-1]/2 + b[2]*x[i-2]/2 *
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28 * + a[1]*y[i-1] + a[2]*y[i-2]; *
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29 * *
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30 * *
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31 * Input is divided by two in the filtering process. *
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32 *------------------------------------------------------------------------*/
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33
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34 /* filter coefficients (fc = 80 Hz, coeff. b[] is divided by 2) */
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35
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36 static const Word16 b[3] = {1899, -3798, 1899};
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37 static const Word16 a[3] = {4096, 7807, -3733};
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38
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39 /* Initialization of static values */
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40
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41 void Init_Pre_Process (struct EFR_encoder_state *st)
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42 {
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43 struct preproc_state *pps = &st->pre_proc;
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45 pps->y2_hi = 0;
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46 pps->y2_lo = 0;
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47 pps->y1_hi = 0;
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48 pps->y1_lo = 0;
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49 pps->x0 = 0;
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50 pps->x1 = 0;
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51 }
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53 void Pre_Process (
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54 struct EFR_encoder_state *st,
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55 Word16 signal[], /* input/output signal */
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56 Word16 lg) /* lenght of signal */
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57 {
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58 struct preproc_state *pps = &st->pre_proc;
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59 Word16 i, x2;
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60 Word32 L_tmp;
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62 for (i = 0; i < lg; i++)
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63 {
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64 x2 = pps->x1;
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65 pps->x1 = pps->x0;
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66 pps->x0 = signal[i];
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68 /* y[i] = b[0]*x[i]/2 + b[1]*x[i-1]/2 + b140[2]*x[i-2]/2 */
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69 /* + a[1]*y[i-1] + a[2] * y[i-2]; */
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70
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71 L_tmp = Mpy_32_16 (pps->y1_hi, pps->y1_lo, a[1]);
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72 L_tmp = L_add (L_tmp, Mpy_32_16 (pps->y2_hi, pps->y2_lo, a[2]));
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73 L_tmp = L_mac (L_tmp, pps->x0, b[0]);
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74 L_tmp = L_mac (L_tmp, pps->x1, b[1]);
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75 L_tmp = L_mac (L_tmp, x2, b[2]);
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76 L_tmp = L_shl (L_tmp, 3);
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77 signal[i] = round (L_tmp);
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78
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79 pps->y2_hi = pps->y1_hi;
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80 pps->y2_lo = pps->y1_lo;
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81 L_Extract (L_tmp, &pps->y1_hi, &pps->y1_lo);
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82 }
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83 return;
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84 }