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comparison libtwamr/pstfilt.h @ 401:59655481e45b

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libtwamr: integrate pstfilt.c
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 06 May 2024 19:44:15 +0000
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400:ffd48f0a2ab5 401:59655481e45b
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 : pstfilt.h
11 * Purpose : Performs adaptive postfiltering on the synthesis
12 * : speech
13 *
14 ********************************************************************************
15 */
16 #ifndef pstfilt_h
17 #define pstfilt_h "$Id $"
18
19 /*
20 ********************************************************************************
21 * INCLUDE FILES
22 ********************************************************************************
23 */
24 #include "tw_amr.h"
25 #include "typedef.h"
26 #include "cnst.h"
27 #include "preemph.h"
28 #include "agc.h"
29 /*
30 ********************************************************************************
31 * DEFINITION OF DATA TYPES
32 ********************************************************************************
33 */
34 typedef struct{
35 Word16 res2[L_SUBFR];
36 Word16 mem_syn_pst[M];
37 preemphasisState preemph_state;
38 agcState agc_state;
39 Word16 synth_buf[M + L_FRAME];
40 } Post_FilterState;
41
42 /*
43 ********************************************************************************
44 * DECLARATION OF PROTOTYPES
45 ********************************************************************************
46 */
47
48 void Post_Filter_reset (Post_FilterState *st);
49 /* reset post filter (i.e. set state memory to zero)
50 returns 0 on success
51 */
52
53 int Post_Filter (
54 Post_FilterState *st, /* i/o : post filter states */
55 enum Mode mode, /* i : AMR mode */
56 Word16 *syn, /* i/o : synthesis speech (postfiltered is output) */
57 Word16 *Az_4 /* i : interpolated LPC parameters in all subfr. */
58 );
59 /* filters the signal syn using the parameters in Az_4 to calculate filter
60 coefficients.
61 The filter must be set up using Post_Filter_init prior to the first call
62 to Post_Filter. Post_FilterState is updated to mirror the current state
63 of the filter
64
65 return 0 on success
66 */
67
68 #endif