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annotate libtwamr/lsp_avg.h @ 451:614ae8dc6807

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README: update for libgsmfr2+libgsmefr+libtwamr set
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 10 May 2024 02:36:34 +0000
parents 9cd332a94c97
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 : lsp_avg.h
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11 * Purpose: : LSP averaging and history
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12 * The LSPs are averaged over 8 frames
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13 *
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14 ********************************************************************************
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15 */
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16 #ifndef lsp_avg_h
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17 #define lsp_avg_h "$Id $"
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18
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19 /*
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20 ********************************************************************************
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21 * INCLUDE FILES
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22 ********************************************************************************
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23 */
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24 #include "typedef.h"
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25 #include "cnst.h"
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26
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27 /*
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28 ********************************************************************************
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29 * LOCAL VARIABLES AND TABLES
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30 ********************************************************************************
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31 */
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32
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33 #define EXPCONST 5243 /* 0.16 in Q15 */
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34
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35 /*
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36 ********************************************************************************
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37 * DEFINITION OF DATA TYPES
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38 ********************************************************************************
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39 */
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40 typedef struct {
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41 Word16 lsp_meanSave[M]; /* Averaged LSPs saved for efficiency */
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42 } lsp_avgState;
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43
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44 /*
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45 ********************************************************************************
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46 * DECLARATION OF PROTOTYPES
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47 ********************************************************************************
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48 */
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49
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50 /*
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51 **************************************************************************
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52 *
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53 * Function : lsp_history_reset
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54 * Purpose : Resets state memory
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55 *
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56 **************************************************************************
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57 */
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58 void lsp_avg_reset (
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59 lsp_avgState *state
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60 );
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61
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62 /*
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63 **************************************************************************
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64 *
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65 * Function : lsp_avg
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66 * Purpose : Calculate the LSP averages
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67 *
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68 **************************************************************************
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69 */
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70 void lsp_avg (
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71 lsp_avgState *st, /* i/o : State struct Q15 */
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72 Word16 *lsp /* i : LSP vector Q15 */
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73 );
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74 #endif