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comparison libtwamr/preemph.h @ 399:3618b5cf25a6

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libtwamr: integrate preemph.c
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 06 May 2024 19:19:27 +0000
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398:df14b0c17e6d 399:3618b5cf25a6
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 : preemph.h
11 * Purpose : Preemphasis filtering
12 * Description : Filtering through 1 - g z^-1
13 *
14 ********************************************************************************
15 */
16 #ifndef preemph_h
17 #define preemph_h "$Id $"
18
19 /*
20 ********************************************************************************
21 * INCLUDE FILES
22 ********************************************************************************
23 */
24 #include "typedef.h"
25
26 /*
27 ********************************************************************************
28 * DEFINITION OF DATA TYPES
29 ********************************************************************************
30 */
31 typedef struct {
32 Word16 mem_pre; /* filter state */
33 } preemphasisState;
34
35 /*
36 ********************************************************************************
37 * DECLARATION OF PROTOTYPES
38 ********************************************************************************
39 */
40
41 void preemphasis_reset (preemphasisState *st);
42 /* reset of preemphasis filter (i.e. set state memory to zero)
43 returns 0 on success
44 */
45
46 int preemphasis (
47 preemphasisState *st, /* (i/o): preemphasis filter state */
48 Word16 *signal, /* (i/o): input signal overwritten by the output */
49 Word16 g, /* (i) : preemphasis coefficient */
50 Word16 L /* (i) : size of filtering */
51 );
52
53 #endif