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annotate libtwamr/ol_ltp.c @ 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 f17e42c63058
children
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f17e42c63058 libtwamr: integrate ol_ltp.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 : ol_ltp.c
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11 * Purpose : Compute the open loop pitch lag.
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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 /*
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17 ********************************************************************************
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18 * MODULE INCLUDE FILE AND VERSION ID
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19 ********************************************************************************
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20 */
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21 #include "namespace.h"
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22 #include "ol_ltp.h"
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23
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24 /*
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25 ********************************************************************************
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26 * INCLUDE FILES
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27 ********************************************************************************
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28 */
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29 #include "typedef.h"
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30 #include "cnst.h"
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31 #include "pitch_ol.h"
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32 #include "p_ol_wgh.h"
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33 #include "no_count.h"
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34 #include "basic_op.h"
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35
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36 /*
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37 ********************************************************************************
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38 * LOCAL VARIABLES AND TABLES
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39 ********************************************************************************
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40 */
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41
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42 /*
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43 ********************************************************************************
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44 * PUBLIC PROGRAM CODE
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45 ********************************************************************************
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46 */
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47 int ol_ltp(
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48 pitchOLWghtState *st, /* i/o : State struct */
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49 vadState *vadSt, /* i/o : VAD state struct */
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50 enum Mode mode, /* i : coder mode */
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51 Word16 wsp[], /* i : signal used to compute the OL pitch, Q0 */
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52 /* uses signal[-pit_max] to signal[-1] */
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53 Word16 *T_op, /* o : open loop pitch lag, Q0 */
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54 Word16 old_lags[], /* i : history with old stored Cl lags */
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55 Word16 ol_gain_flg[], /* i : OL gain flag */
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56 Word16 idx, /* i : index */
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57 Flag dtx /* i : dtx flag; use dtx=1, do not use dtx=0 */
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58 )
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59 {
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60 test ();
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61 if (sub (mode, MR102) != 0 )
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62 {
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63 ol_gain_flg[0] = 0; move16 ();
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64 ol_gain_flg[1] = 0; move16 ();
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65 }
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66
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67 test (); test ();
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68 if (sub (mode, MR475) == 0 || sub (mode, MR515) == 0 )
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69 {
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70 *T_op = Pitch_ol(vadSt, mode, wsp, PIT_MIN, PIT_MAX, L_FRAME, idx, dtx);
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71 move16 ();
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72 }
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73 else
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74 {
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75 if ( sub (mode, MR795) <= 0 )
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76 {
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77 test();
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78 *T_op = Pitch_ol(vadSt, mode, wsp, PIT_MIN, PIT_MAX, L_FRAME_BY2,
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79 idx, dtx);
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80 move16 ();
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81 }
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82 else if ( sub (mode, MR102) == 0 )
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83 {
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84 test(); test();
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85 *T_op = Pitch_ol_wgh(st, vadSt, wsp, PIT_MIN, PIT_MAX, L_FRAME_BY2,
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86 old_lags, ol_gain_flg, idx, dtx);
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87 move16 ();
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88 }
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89 else
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90 {
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91 test(); test();
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92 *T_op = Pitch_ol(vadSt, mode, wsp, PIT_MIN_MR122, PIT_MAX,
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93 L_FRAME_BY2, idx, dtx);
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94 move16 ();
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95 }
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96 }
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97 return 0;
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98 }