1 | //volume.c: |
---|
2 | |
---|
3 | /* |
---|
4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010 |
---|
5 | * The code (may) include prototypes and comments (and maybe |
---|
6 | * other code fragements) from libpulse*. They are mostly copyrighted by: |
---|
7 | * Lennart Poettering <poettering@users.sourceforge.net> and |
---|
8 | * Pierre Ossman <drzeus@drzeus.cx> |
---|
9 | * |
---|
10 | * This file is part of libroarpulse a part of RoarAudio, |
---|
11 | * a cross-platform sound system for both, home and professional use. |
---|
12 | * See README for details. |
---|
13 | * |
---|
14 | * This file is free software; you can redistribute it and/or modify |
---|
15 | * it under the terms of the GNU General Public License version 3 |
---|
16 | * as published by the Free Software Foundation. |
---|
17 | * |
---|
18 | * RoarAudio is distributed in the hope that it will be useful, |
---|
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
---|
21 | * GNU General Public License for more details. |
---|
22 | * |
---|
23 | * You should have received a copy of the GNU General Public License |
---|
24 | * along with this software; see the file COPYING. If not, write to |
---|
25 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
---|
26 | * Boston, MA 02110-1301, USA. |
---|
27 | * |
---|
28 | * NOTE for everyone want's to change something and send patches: |
---|
29 | * read README and HACKING! There a addition information on |
---|
30 | * the license of this document you need to read before you send |
---|
31 | * any patches. |
---|
32 | * |
---|
33 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
---|
34 | * or libpulse*: |
---|
35 | * The libs libroaresd, libroararts and libroarpulse link this libroar |
---|
36 | * and are therefore GPL. Because of this it may be illigal to use |
---|
37 | * them with any software that uses libesd, libartsc or libpulse*. |
---|
38 | */ |
---|
39 | |
---|
40 | #include <libroarpulse/libroarpulse.h> |
---|
41 | |
---|
42 | /** Return non-zero when *a == *b */ |
---|
43 | int pa_cvolume_equal(const pa_cvolume *a, const pa_cvolume *b) { |
---|
44 | int i; |
---|
45 | |
---|
46 | if ( a == b ) |
---|
47 | return 1; |
---|
48 | |
---|
49 | if ( a == NULL || b == NULL ) |
---|
50 | return 0; |
---|
51 | |
---|
52 | if ( a->channels != b->channels ) |
---|
53 | return 0; |
---|
54 | |
---|
55 | for (i = 0; i < a->channels; i++) |
---|
56 | if ( a->values[i] != b->values[i] ) |
---|
57 | return 0; |
---|
58 | |
---|
59 | return 1; |
---|
60 | } |
---|
61 | |
---|
62 | /** Set the volume of all channels to the specified parameter */ |
---|
63 | pa_cvolume* pa_cvolume_set(pa_cvolume *a, unsigned channels, pa_volume_t v) { |
---|
64 | int i; |
---|
65 | |
---|
66 | if ( a == NULL ) |
---|
67 | return NULL; |
---|
68 | |
---|
69 | if ( channels > PA_CHANNELS_MAX ) |
---|
70 | return NULL; |
---|
71 | |
---|
72 | a->channels = channels; |
---|
73 | |
---|
74 | for (i = 0; i < channels; i++) { |
---|
75 | a->values[i] = v; |
---|
76 | } |
---|
77 | |
---|
78 | return a; |
---|
79 | } |
---|
80 | |
---|
81 | /** Pretty print a volume structure */ |
---|
82 | char *pa_cvolume_snprint(char *s, size_t l, const pa_cvolume *c); |
---|
83 | |
---|
84 | /** Return the average volume of all channels */ |
---|
85 | pa_volume_t pa_cvolume_avg(const pa_cvolume *a) { |
---|
86 | int64_t sum = 0; |
---|
87 | int i; |
---|
88 | |
---|
89 | #ifndef PA_VOLUME_INVALID |
---|
90 | #define PA_VOLUME_INVALID ((pa_volume_t) UINT32_MAX) |
---|
91 | #endif |
---|
92 | |
---|
93 | if ( a == NULL ) |
---|
94 | return PA_VOLUME_INVALID; |
---|
95 | |
---|
96 | for (i = 0; i < a->channels; i++) |
---|
97 | sum += a->values[i]; |
---|
98 | |
---|
99 | return sum/a->channels; |
---|
100 | } |
---|
101 | |
---|
102 | /** Return TRUE when the passed cvolume structure is valid, FALSE otherwise */ |
---|
103 | int pa_cvolume_valid(const pa_cvolume *v) { |
---|
104 | if ( v == NULL ) |
---|
105 | return 0; |
---|
106 | |
---|
107 | if ( v->channels <= 0 ) |
---|
108 | return 0; |
---|
109 | |
---|
110 | if ( v->channels > PA_CHANNELS_MAX ) |
---|
111 | return 0; |
---|
112 | |
---|
113 | return 1; |
---|
114 | } |
---|
115 | |
---|
116 | /** Return non-zero if the volume of all channels is equal to the specified value */ |
---|
117 | int pa_cvolume_channels_equal_to(const pa_cvolume *a, pa_volume_t v) { |
---|
118 | int i; |
---|
119 | |
---|
120 | if ( a == NULL ) |
---|
121 | return 0; |
---|
122 | |
---|
123 | for (i = 0; i < a->channels; i++) |
---|
124 | if ( a->values[i] != v ) |
---|
125 | return 0; |
---|
126 | |
---|
127 | return 1; |
---|
128 | } |
---|
129 | |
---|
130 | /** Multiply two volumes specifications, return the result. This uses PA_VOLUME_NORM as neutral element of multiplication. This is only valid for software volumes! */ |
---|
131 | pa_volume_t pa_sw_volume_multiply(pa_volume_t a, pa_volume_t b); |
---|
132 | |
---|
133 | /** Multiply to per-channel volumes and return the result in *dest. This is only valid for software volumes! */ |
---|
134 | pa_cvolume *pa_sw_cvolume_multiply(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b); |
---|
135 | |
---|
136 | /** Convert a decibel value to a volume. This is only valid for software volumes! \since 0.4 */ |
---|
137 | pa_volume_t pa_sw_volume_from_dB(double f); |
---|
138 | |
---|
139 | /** Convert a volume to a decibel value. This is only valid for software volumes! \since 0.4 */ |
---|
140 | double pa_sw_volume_to_dB(pa_volume_t v); |
---|
141 | |
---|
142 | /** Convert a linear factor to a volume. This is only valid for software volumes! \since 0.8 */ |
---|
143 | pa_volume_t pa_sw_volume_from_linear(double v); |
---|
144 | |
---|
145 | /** Convert a volume to a linear factor. This is only valid for software volumes! \since 0.8 */ |
---|
146 | double pa_sw_volume_to_linear(pa_volume_t v); |
---|
147 | |
---|
148 | //ll |
---|