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annotate libtwamr/bgnscd.h @ 589:e414d138c607

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amrconv: new program amr-ietf2hexoa
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 06 Nov 2025 21:18:59 +0000
parents 8dfb7cbe6b59
children
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8dfb7cbe6b59 libtwamr: integrated up to bgnscd.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 : bgnscd.h
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11 * Purpose : Background noise source charateristic detector (SCD)
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12 *
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13 ********************************************************************************
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14 */
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15 #ifndef bgnscd_h
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16 #define bgnscd_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 #include "cnst.h"
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25
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26 /*
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27 ********************************************************************************
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28 * LOCAL VARIABLES AND TABLES
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29 ********************************************************************************
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30 */
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31 #define L_ENERGYHIST 60
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32 #define INV_L_FRAME 102
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33
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34
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35 /* 2*(160*x)^2 / 65536 where x is FLP values 150,5 and 50 */
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36 #define FRAMEENERGYLIMIT 17578 /* 150 */
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37 #define LOWERNOISELIMIT 20 /* 5 */
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38 #define UPPERNOISELIMIT 1953 /* 50 */
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39
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40 /*
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41 ********************************************************************************
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42 * DEFINITION OF DATA TYPES
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43 ********************************************************************************
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44 */
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45 typedef struct{
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46 /* history vector of past synthesis speech energy */
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47 Word16 frameEnergyHist[L_ENERGYHIST];
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48
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49 /* state flags */
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50 Word16 bgHangover; /* counter; number of frames after last speech frame */
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51
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52 } Bgn_scdState;
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53
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54 /*
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55 ********************************************************************************
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56 * DECLARATION OF PROTOTYPES
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57 ********************************************************************************
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58 */
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59 /*
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60 **************************************************************************
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61 *
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62 * Function : Bgn_scd_reset
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63 * Purpose : Resets state memory
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64 * Returns : 0 on success
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65 *
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66 **************************************************************************
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67 */
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68 void Bgn_scd_reset (Bgn_scdState *st);
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69
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70 /*
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71 **************************************************************************
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72 *
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73 * Function : Bgn_scd
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74 * Purpose : Charaterice synthesis speech and detect background noise
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75 * Returns : background noise decision; 0 = bgn, 1 = no bgn
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76 *
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77 **************************************************************************
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78 */
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79 Word16 Bgn_scd (Bgn_scdState *st, /* i : State variables for bgn SCD */
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80 Word16 ltpGainHist[], /* i : LTP gain history */
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81 Word16 speech[], /* o : synthesis speech frame */
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82 Word16 *voicedHangover /* o : # of frames after last voiced frame */
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83 );
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84
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85 #endif