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annotate libtwamr/post_pro.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 a0f914a28371
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a0f914a28371 libtwamr: integrate post_pro.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 : post_pro.h
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11 * Purpose : Postprocessing of output speech.
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12 *
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13 * - 2nd order high pass filtering with cut
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14 * off frequency at 60 Hz.
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15 * - Multiplication of output by two.
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16 *
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17 ********************************************************************************
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18 */
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19 #ifndef post_pro_h
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20 #define post_pro_h "$Id $"
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21
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22 /*
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23 ********************************************************************************
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24 * INCLUDE FILES
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25 ********************************************************************************
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26 */
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27 #include "typedef.h"
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28
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29 /*
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30 ********************************************************************************
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31 * LOCAL VARIABLES AND TABLES
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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 ********************************************************************************
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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 y2_hi;
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42 Word16 y2_lo;
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43 Word16 y1_hi;
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44 Word16 y1_lo;
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45 Word16 x0;
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46 Word16 x1;
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47 } Post_ProcessState;
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48
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49 /*
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50 ********************************************************************************
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51 * DECLARATION OF PROTOTYPES
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52 ********************************************************************************
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53 */
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54
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55 void Post_Process_reset (Post_ProcessState *st);
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56 /* reset of Post processing state (i.e. set state memory to zero)
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57 returns 0 on success
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58 */
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59
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60 int Post_Process (
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61 Post_ProcessState *st, /* i/o : post process state */
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62 Word16 signal[], /* i/o : signal */
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63 Word16 lg /* i : lenght of signal */
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64 );
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65
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66 #endif