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annotate libtwamr/lpc.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 9adfe3863a41
children
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1 /*
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2 ********************************************************************************
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3 *
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4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
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5 * R99 Version 3.3.0
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6 * REL-4 Version 4.1.0
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7 *
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8 ********************************************************************************
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9 *
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10 * File : lpc.c
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11 *
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12 ********************************************************************************
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13 */
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14
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15 /*
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16 ********************************************************************************
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17 * MODULE INCLUDE FILE AND VERSION ID
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18 ********************************************************************************
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19 */
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20 #include "namespace.h"
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21 #include "lpc.h"
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22
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23 /*
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24 ********************************************************************************
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25 * INCLUDE FILES
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26 ********************************************************************************
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27 */
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28 #include "tw_amr.h"
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29 #include "typedef.h"
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30 #include "basic_op.h"
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31 #include "oper_32b.h"
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32 #include "autocorr.h"
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33 #include "lag_wind.h"
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34 #include "levinson.h"
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35 #include "cnst.h"
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36 #include "no_count.h"
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37 #include "window.h"
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38
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39 /*
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40 ********************************************************************************
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41 * PUBLIC PROGRAM CODE
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42 ********************************************************************************
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43 */
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44
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45 /*************************************************************************
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46 *
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47 * Function: lpc_reset
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48 *
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49 **************************************************************************
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50 */
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51 void lpc_reset (lpcState *state)
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52 {
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53 Levinson_reset(&state->levinsonSt);
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54 }
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55
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56 int lpc(
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57 lpcState *st, /* i/o: State struct */
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58 enum Mode mode, /* i : coder mode */
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59 Word16 x[], /* i : Input signal Q15 */
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60 Word16 x_12k2[], /* i : Input signal (EFR) Q15 */
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61 Word16 a[] /* o : predictor coefficients Q12 */
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62 )
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63 {
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64 Word16 rc[4]; /* First 4 reflection coefficients Q15 */
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65 Word16 rLow[MP1], rHigh[MP1]; /* Autocorrelations low and hi */
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66 /* No fixed Q value but normalized */
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67 /* so that overflow is avoided */
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68
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69 test ();
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70 if ( sub (mode, MR122) == 0)
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71 {
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72 /* Autocorrelations */
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73 Autocorr(x_12k2, M, rHigh, rLow, window_160_80);
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74 /* Lag windowing */
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75 Lag_window(M, rHigh, rLow);
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76 /* Levinson Durbin */
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77 Levinson(&st->levinsonSt, rHigh, rLow, &a[MP1], rc);
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78
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79 /* Autocorrelations */
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80 Autocorr(x_12k2, M, rHigh, rLow, window_232_8);
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81 /* Lag windowing */
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82 Lag_window(M, rHigh, rLow);
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83 /* Levinson Durbin */
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84 Levinson(&st->levinsonSt, rHigh, rLow, &a[MP1 * 3], rc);
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85 }
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86 else
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87 {
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88 /* Autocorrelations */
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89 Autocorr(x, M, rHigh, rLow, window_200_40);
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90 /* Lag windowing */
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91 Lag_window(M, rHigh, rLow);
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92 /* Levinson Durbin */
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93 Levinson(&st->levinsonSt, rHigh, rLow, &a[MP1 * 3], rc);
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94 }
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95
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96 return 0;
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97 }