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annotate libtwamr/int_lsf.h @ 478:936a08cc73ce

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doc/AMR-library-API: describe the decoder
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 19 May 2024 21:32:31 +0000
parents 693ea1d5cf1e
children
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693ea1d5cf1e libtwamr: integrate int_lsf.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 : int_lsf.h
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11 * Purpose : Interpolates the LSFs
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12 *
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13 ********************************************************************************
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14 */
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15 #ifndef int_lsf_h
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16 #define int_lsf_h "$Id $"
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17
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18 /*
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19 ********************************************************************************
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20 * INCLUDE FILES
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21 ********************************************************************************
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22 */
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23 #include "typedef.h"
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24
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25 /*
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26 ********************************************************************************
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27 * DEFINITION OF DATA TYPES
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28 ********************************************************************************
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29 */
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30
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31 /*
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32 ********************************************************************************
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33 * DECLARATION OF PROTOTYPES
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34 ********************************************************************************
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35 */
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36
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37 /*
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38 **************************************************************************
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39 *
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40 * Function : Int_lsf
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41 * Purpose : Interpolates the LSFs for selected subframe
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42 * Description : The 20 ms speech frame is divided into 4 subframes.
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43 * The LSFs are interpolated at the 1st, 2nd and 3rd
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44 * subframe and only forwarded at the 4th subframe.
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45 *
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46 * |------|------|------|------|
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47 * sf1 sf2 sf3 sf4
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48 * F0 F1
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49 *
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50 * sf1: 3/4 F0 + 1/4 F1 sf3: 1/4 F0 + 3/4 F1
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51 * sf2: 1/2 F0 + 1/2 F1 sf4: F1
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52 * Returns : void
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53 *
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54 **************************************************************************
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55 */
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56 void Int_lsf (
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57 Word16 lsf_old[], /* i : LSF vector at the 4th SF of past frame */
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58 Word16 lsf_new[], /* i : LSF vector at the 4th SF of present frame */
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59 Word16 i_subfr, /* i : Pointer to current sf (equal to 0,40,80 or 120) */
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60 Word16 lsf_out[] /* o : interpolated LSF parameters for current sf */
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61 );
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62
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63 #endif