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comparison libtwamr/lpc.h @ 386:9adfe3863a41

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libtwamr: integrate lpc.c
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 06 May 2024 06:24:26 +0000
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385:c713061b6edf 386:9adfe3863a41
1 /*
2 ********************************************************************************
3 *
4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
5 * R99 Version 3.3.0
6 * REL-4 Version 4.1.0
7 *
8 ********************************************************************************
9 *
10 * File : lpc.h
11 * Purpose : 2 LP analyses centered at 2nd and 4th subframe
12 * for mode 12.2. For all other modes a
13 * LP analysis centered at 4th subframe is
14 * performed.
15 *
16 ********************************************************************************
17 */
18 #ifndef lpc_h
19 #define lpc_h "$Id $"
20
21 /*
22 ********************************************************************************
23 * INCLUDE FILES
24 ********************************************************************************
25 */
26 #include "tw_amr.h"
27 #include "typedef.h"
28 #include "levinson.h"
29
30 /*
31 ********************************************************************************
32 * LOCAL VARIABLES AND TABLES
33 ********************************************************************************
34 */
35 /*
36 ********************************************************************************
37 * DEFINITION OF DATA TYPES
38 ********************************************************************************
39 */
40 typedef struct {
41 LevinsonState levinsonSt;
42 } lpcState;
43
44 /*
45 ********************************************************************************
46 * DECLARATION OF PROTOTYPES
47 ********************************************************************************
48 */
49
50 void lpc_reset (lpcState *st);
51 /* reset of pre processing state (i.e. set state memory to zero)
52 returns 0 on success
53 */
54
55 int lpc(
56 lpcState *st, /* i/o: State struct */
57 enum Mode mode, /* i : coder mode */
58 Word16 x[], /* i : Input signal Q15 */
59 Word16 x_12k2[], /* i : Input signal (EFR) Q15 */
60 Word16 a[] /* o : predictor coefficients Q12 */
61 );
62
63 #endif