FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/bgnscd.h @ 400:ffd48f0a2ab5
libtwamr: implement Prm2bits() like Bits2prm()
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 06 May 2024 19:34:59 +0000 |
parents | 8dfb7cbe6b59 |
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rev | line source |
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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 |