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annotate libtwamr/lpc.h @ 483:4f13db3a7086

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doc/Utils-overview: document new utilities
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:26:12 +0000
parents 9adfe3863a41
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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.h
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11 * Purpose : 2 LP analyses centered at 2nd and 4th subframe
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12 * for mode 12.2. For all other modes a
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13 * LP analysis centered at 4th subframe is
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14 * performed.
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15 *
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16 ********************************************************************************
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17 */
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18 #ifndef lpc_h
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19 #define lpc_h "$Id $"
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20
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21 /*
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22 ********************************************************************************
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23 * INCLUDE FILES
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24 ********************************************************************************
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25 */
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26 #include "tw_amr.h"
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27 #include "typedef.h"
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28 #include "levinson.h"
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29
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30 /*
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31 ********************************************************************************
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32 * LOCAL VARIABLES AND TABLES
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33 ********************************************************************************
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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 LevinsonState levinsonSt;
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42 } lpcState;
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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 void lpc_reset (lpcState *st);
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51 /* reset of pre processing state (i.e. set state memory to zero)
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52 returns 0 on success
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53 */
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54
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55 int lpc(
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56 lpcState *st, /* i/o: State struct */
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57 enum Mode mode, /* i : coder mode */
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58 Word16 x[], /* i : Input signal Q15 */
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59 Word16 x_12k2[], /* i : Input signal (EFR) Q15 */
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60 Word16 a[] /* o : predictor coefficients Q12 */
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61 );
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62
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63 #endif