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annotate libtwamr/levinson.h @ 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 c713061b6edf
children
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c713061b6edf libtwamr: integrate levinson.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 : levinson.h
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11 * Purpose : Levinson-Durbin algorithm in double precision.
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12 * : To compute the LP filter parameters from the
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13 * : speech autocorrelations.
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14 *
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15 ********************************************************************************
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16 */
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17 #ifndef levinson_h
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18 #define levinson_h "$Id $"
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19
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20 /*
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21 ********************************************************************************
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22 * INCLUDE FILES
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23 ********************************************************************************
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24 */
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25 #include "typedef.h"
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26 #include "cnst.h"
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27
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28 /*
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29 ********************************************************************************
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30 * LOCAL VARIABLES AND TABLES
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31 ********************************************************************************
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32 */
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33
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34 /*
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35 ********************************************************************************
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36 * DEFINITION OF DATA TYPES
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37 ********************************************************************************
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38 */
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39 typedef struct {
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40 Word16 old_A[M + 1]; /* Last A(z) for case of unstable filter */
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41 } LevinsonState;
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42
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43 /*
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44 ********************************************************************************
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45 * DECLARATION OF PROTOTYPES
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46 ********************************************************************************
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47 */
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48
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49 void Levinson_reset (LevinsonState *st);
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50 /* reset of pre processing state (i.e. set state memory to zero)
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51 returns 0 on success
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52 */
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53
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54 int Levinson (
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55 LevinsonState *st,
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56 Word16 Rh[], /* i : Rh[m+1] Vector of autocorrelations (msb) */
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57 Word16 Rl[], /* i : Rl[m+1] Vector of autocorrelations (lsb) */
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58 Word16 A[], /* o : A[m] LPC coefficients (m = 10) */
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59 Word16 rc[] /* o : rc[4] First 4 reflection coefficients */
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60 );
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61
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62 #endif