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annotate libtwamr/lflg_upd.c @ 458:e26b974f7ba3

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doc/AMR-study-utils: update for the current situation
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 10 May 2024 18:45:36 +0000
parents bd5614fc780a
children
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bd5614fc780a libtwamr: integrate VAD2 lflg_upd.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 : lflg_upd.c
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11 * Purpose : LTP_flag update for AMR VAD option 2
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12 *
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13 *****************************************************************************
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14 */
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15
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16 #include "tw_amr.h"
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17 #include "namespace.h"
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18 #include "typedef.h"
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19 #include "cnst.h"
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20 #include "basic_op.h"
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21 #include "oper_32b.h"
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22 #include "no_count.h"
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23 #include "vad2.h"
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24
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25 /***************************************************************************
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26 *
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27 * FUNCTION NAME: LTP_flag_update
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28 *
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29 * PURPOSE:
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30 * Set LTP_flag if the LTP gain > LTP_THRESHOLD, where the value of
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31 * LTP_THRESHOLD depends on the LTP analysis window length.
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32 *
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33 * INPUTS:
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34 *
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35 * mode
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36 * AMR mode
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37 * vadState->L_R0
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38 * LTP energy
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39 * vadState->L_Rmax
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40 * LTP maximum autocorrelation
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41 * OUTPUTS:
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42 *
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43 * vadState->LTP_flag
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44 * Set if LTP gain > LTP_THRESHOLD
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45 *
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46 * RETURN VALUE:
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47 *
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48 * none
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49 *
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50 *************************************************************************/
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51
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52 void LTP_flag_update (vadState2 * st, Word16 mode)
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53 {
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54 Word16 thresh;
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55 Word16 hi1;
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56 Word16 lo1;
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57 Word32 Ltmp;
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58
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59 test(); test();
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60 if ((sub(mode, MR475) == 0) || (sub(mode, MR515) == 0))
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61 {
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62 thresh = (Word16)(32768.0*0.55); move16();
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63 }
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64 else if (sub(mode, MR102) == 0)
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65 {
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66 thresh = (Word16)(32768.0*0.60); move16();
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67 }
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68 else
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69 {
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70 thresh = (Word16)(32768.0*0.65); move16();
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71 }
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72
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73 L_Extract (st->L_R0, &hi1, &lo1);
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74 Ltmp = Mpy_32_16(hi1, lo1, thresh); test();
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75 if (L_sub(st->L_Rmax, Ltmp) > 0)
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76 {
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77 st->LTP_flag = TRUE; move16();
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78 }
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79 else
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80 {
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81 st->LTP_flag = FALSE; move16();
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82 }
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83
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84 return;
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85 }