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annotate libtwamr/lsp_avg.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 9cd332a94c97
children
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9cd332a94c97 libtwamr: integrate lsp_avg.c
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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 : lsp_avg.c
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11 * Purpose: : LSP averaging and history
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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 *****************************************************************************
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18 * MODULE INCLUDE FILE AND VERSION ID
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19 *****************************************************************************
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20 */
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21 #include "namespace.h"
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22 #include "lsp_avg.h"
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23
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24 /*
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25 *****************************************************************************
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26 * INCLUDE FILES
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27 *****************************************************************************
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28 */
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29 #include "basic_op.h"
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30 #include "oper_32b.h"
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31 #include "no_count.h"
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32 #include "q_plsf5_tab.h"
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33 #include "memops.h"
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34
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35 /*
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36 *****************************************************************************
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37 * LOCAL VARIABLES AND TABLES
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38 *****************************************************************************
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39 */
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40 /*
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41 *****************************************************************************
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42 * PUBLIC PROGRAM CODE
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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 **************************************************************************
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48 *
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49 * Function : lsp_avg_reset
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50 * Purpose : Resets state memory
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51 *
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52 **************************************************************************
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53 */
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54 void lsp_avg_reset (lsp_avgState *st)
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55 {
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56 Copy(mean_lsf, &st->lsp_meanSave[0], M);
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57 }
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58
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59 /*
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60 **************************************************************************
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61 *
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62 * Function : lsp_avg
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63 * Purpose : Calculate the LSP averages
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64 *
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65 **************************************************************************
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66 */
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67
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68 void lsp_avg (
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69 lsp_avgState *st, /* i/o : State struct Q15 */
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70 Word16 *lsp /* i : state of the state machine Q15 */
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71 )
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72 {
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73 Word16 i;
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74 Word32 L_tmp; /* Q31 */
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75
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76 for (i = 0; i < M; i++) {
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77
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78 /* mean = 0.84*mean */
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79 L_tmp = L_deposit_h(st->lsp_meanSave[i]);
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80 L_tmp = L_msu(L_tmp, EXPCONST, st->lsp_meanSave[i]);
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81
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82 /* Add 0.16 of newest LSPs to mean */
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83 L_tmp = L_mac(L_tmp, EXPCONST, lsp[i]);
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84
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85 /* Save means */
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86 st->lsp_meanSave[i] = round(L_tmp); move16(); /* Q15 */
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87 }
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88
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89 return;
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90 }