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annotate libtwamr/cl_ltp.h @ 478:936a08cc73ce

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doc/AMR-library-API: describe the decoder
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 19 May 2024 21:32:31 +0000
parents 85e9768d497f
children
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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 : cl_ltp.h
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11 * Purpose : Closed-loop fractional pitch search
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12 *
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13 ********************************************************************************
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14 */
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15 #ifndef cl_ltp_h
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16 #define cl_ltp_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 "tw_amr.h"
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24 #include "typedef.h"
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25 #include "pitch_fr.h"
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26 #include "ton_stab.h"
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27
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28 /*
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29 ********************************************************************************
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30 * LOCAL VARIABLES AND TABLES
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31 ********************************************************************************
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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 * DEFINITION OF DATA TYPES
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37 ********************************************************************************
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38 */
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39
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40 /* state variable */
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41 typedef struct {
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42 Pitch_frState pitchSt;
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43 } clLtpState;
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44
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45 /*
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46 ********************************************************************************
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47 * DECLARATION OF PROTOTYPES
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48 ********************************************************************************
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49 */
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50
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51 void cl_ltp_reset (clLtpState *st);
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52 /* reset of pre processing state (i.e. set state memory to zero)
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53 returns 0 on success
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54 */
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55
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56 int cl_ltp(
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57 clLtpState *clSt, /* i/o : State struct */
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58 tonStabState *tonSt, /* i/o : State struct */
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59 enum Mode mode, /* i : coder mode */
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60 Word16 frameOffset, /* i : Offset to subframe */
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61 Word16 T_op[], /* i : Open loop pitch lags */
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62 Word16 *h1, /* i : Impulse response vector Q12 */
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63 Word16 *exc, /* i/o : Excitation vector Q0 */
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64 Word16 res2[], /* i/o : Long term prediction residual Q0 */
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65 Word16 xn[], /* i : Target vector for pitch search Q0 */
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66 Word16 lsp_flag, /* i : LSP resonance flag */
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67 Word16 xn2[], /* o : Target vector for codebook search Q0 */
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68 Word16 y1[], /* o : Filtered adaptive excitation Q0 */
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69 Word16 *T0, /* o : Pitch delay (integer part) */
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70 Word16 *T0_frac, /* o : Pitch delay (fractional part) */
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71 Word16 *gain_pit, /* o : Pitch gain Q14 */
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72 Word16 g_coeff[], /* o : Correlations between xn, y1, & y2 */
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73 Word16 **anap, /* o : Analysis parameters */
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74 Word16 *gp_limit /* o : pitch gain limit */
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75 );
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76
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77 #endif