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comparison OpenAL32/Include/bs2b.h @ 0:f9476ff7637e

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initial forking of open-al to create multiple listeners
author Robert McIntyre <rlm@mit.edu>
date Tue, 25 Oct 2011 13:02:31 -0700
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1 /*-
2 * Copyright (c) 2005 Boris Mikhaylov
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sublicense, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 */
23
24 #ifndef BS2B_H
25 #define BS2B_H
26
27 /* Number of crossfeed levels */
28 #define BS2B_CLEVELS 3
29
30 /* Normal crossfeed levels */
31 #define BS2B_HIGH_CLEVEL 3
32 #define BS2B_MIDDLE_CLEVEL 2
33 #define BS2B_LOW_CLEVEL 1
34
35 /* Easy crossfeed levels */
36 #define BS2B_HIGH_ECLEVEL BS2B_HIGH_CLEVEL + BS2B_CLEVELS
37 #define BS2B_MIDDLE_ECLEVEL BS2B_MIDDLE_CLEVEL + BS2B_CLEVELS
38 #define BS2B_LOW_ECLEVEL BS2B_LOW_CLEVEL + BS2B_CLEVELS
39
40 /* Default crossfeed levels */
41 #define BS2B_DEFAULT_CLEVEL BS2B_HIGH_ECLEVEL
42 /* Default sample rate (Hz) */
43 #define BS2B_DEFAULT_SRATE 44100
44
45 #ifdef __cplusplus
46 extern "C" {
47 #endif /* __cplusplus */
48
49 struct bs2b {
50 int level; /* Crossfeed level */
51 int srate; /* Sample rate (Hz) */
52
53 /* Lowpass IIR filter coefficients */
54 double a0_lo;
55 double b1_lo;
56
57 /* Highboost IIR filter coefficients */
58 double a0_hi;
59 double a1_hi;
60 double b1_hi;
61
62 /* Global gain against overloading */
63 double gain;
64
65 /* Buffer of last filtered sample.
66 * [0] - first channel, [1] - second channel
67 */
68 struct t_last_sample {
69 double asis[2];
70 double lo[2];
71 double hi[2];
72 } last_sample;
73 };
74
75 /* Clear buffers and set new coefficients with new crossfeed level value.
76 * level - crossfeed level of *LEVEL values.
77 */
78 void bs2b_set_level(struct bs2b *bs2b, int level);
79
80 /* Return current crossfeed level value */
81 int bs2b_get_level(struct bs2b *bs2b);
82
83 /* Clear buffers and set new coefficients with new sample rate value.
84 * srate - sample rate by Hz.
85 */
86 void bs2b_set_srate(struct bs2b *bs2b, int srate);
87
88 /* Return current sample rate value */
89 int bs2b_get_srate(struct bs2b *bs2b);
90
91 /* Clear buffer */
92 void bs2b_clear(struct bs2b *bs2b);
93
94 /* Return 1 if buffer is clear */
95 int bs2b_is_clear(struct bs2b *bs2b);
96
97 /* Crossfeeds one stereo sample that are pointed by sample.
98 * [0] - first channel, [1] - second channel.
99 * Returns crossfided samle by sample pointer.
100 */
101
102 /* sample poits to floats */
103 void bs2b_cross_feed(struct bs2b *bs2b, float *sample);
104
105 #ifdef __cplusplus
106 } /* extern "C" */
107 #endif /* __cplusplus */
108
109 #endif /* BS2B_H */