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annotate libtwamr/lpc.c @ 485:751f06541fbb

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doc/Codec-utils: clarify lack of DHF in gsmfr-decode-rb
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:47:22 +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 }