source: roaraudio/libroardsp/filter_agc.c @ 5381:430b1d26e12d

Last change on this file since 5381:430b1d26e12d was 5381:430b1d26e12d, checked in by phi, 12 years ago

updated copyright years

File size: 2.4 KB
Line 
1//filter_agc.c:
2
3/*
4 *      Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2009-2012
5 *
6 *  This file is part of libroardsp a part of RoarAudio,
7 *  a cross-platform sound system for both, home and professional use.
8 *  See README for details.
9 *
10 *  This file is free software; you can redistribute it and/or modify
11 *  it under the terms of the GNU General Public License version 3
12 *  as published by the Free Software Foundation.
13 *
14 *  libroardsp is distributed in the hope that it will be useful,
15 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
16 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17 *  GNU General Public License for more details.
18 *
19 *  You should have received a copy of the GNU General Public License
20 *  along with this software; see the file COPYING.  If not, write to
21 *  the Free Software Foundation, 51 Franklin Street, Fifth Floor,
22 *  Boston, MA 02110-1301, USA.
23 *
24 */
25
26#include "libroardsp.h"
27
28int roardsp_agc_init   (struct roardsp_filter * filter, struct roar_stream * stream, int id) {
29 struct roardsp_agc * self = roar_mm_malloc(sizeof(struct roardsp_agc));
30
31 (void)id;
32
33 if ( self == NULL )
34  return -1;
35
36 memset(self, 0, sizeof(struct roardsp_agc));
37
38 if ( roardsp_filter_new(&(self->amp), stream, ROARDSP_FILTER_AMP) == -1 ) {
39  roar_mm_free(self);
40  return -1;
41 }
42
43 filter->inst = (void*) self;
44
45 if ( roardsp_filter_reset(filter, ROARDSP_RESET_FULL) == -1 ) {
46  roardsp_agc_uninit(filter);
47  return -1;
48 }
49
50 return 0;
51}
52
53int roardsp_agc_uninit (struct roardsp_filter * filter) {
54 struct roardsp_agc * self = filter->inst;
55
56 roardsp_filter_free(self->amp);
57 roar_mm_free(self);
58 return 0;
59}
60
61int roardsp_agc_ctl    (struct roardsp_filter * filter, int cmd, void * data) {
62 struct roardsp_agc * self = filter->inst;
63
64 (void)self;
65
66 return -1;
67}
68
69int roardsp_agc_reset  (struct roardsp_filter * filter, int what) {
70 struct roardsp_agc * self = filter->inst;
71
72 switch (what) {
73  case ROARDSP_RESET_NONE:
74    return 0;
75   break;
76  case ROARDSP_RESET_FULL:
77    if ( filter->bits < 4 )
78     return -1;
79
80    self->target_amp = 1 << (filter->bits - 3);
81
82    if ( roardsp_filter_reset(self->amp, ROARDSP_RESET_FULL) == -1 )
83     return -1;
84
85    return -1;
86   break;
87  case ROARDSP_RESET_STATE:
88    if ( roardsp_filter_reset(self->amp, ROARDSP_RESET_STATE) == -1 )
89     return -1;
90    return -1;
91   break;
92  default: return -1;
93 }
94
95 return 0;
96}
97
98//ll
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