summaryrefslogtreecommitdiffstats
path: root/src/pulse/volume.c
blob: 70d6f86a99110ba770e68558dca848bd673bcf0e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
/***
  This file is part of PulseAudio.

  Copyright 2004-2006 Lennart Poettering

  PulseAudio is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published
  by the Free Software Foundation; either version 2 of the License,
  or (at your option) any later version.

  PulseAudio is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with PulseAudio; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA.
***/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include <string.h>

#include <pulsecore/core-util.h>
#include <pulsecore/macro.h>

#include "volume.h"

int pa_cvolume_equal(const pa_cvolume *a, const pa_cvolume *b) {
    int i;
    pa_assert(a);
    pa_assert(b);

    if (a->channels != b->channels)
        return 0;

    for (i = 0; i < a->channels; i++)
        if (a->values[i] != b->values[i])
            return 0;

    return 1;
}

pa_cvolume* pa_cvolume_set(pa_cvolume *a, unsigned channels, pa_volume_t v) {
    int i;

    pa_assert(a);
    pa_assert(channels > 0);
    pa_assert(channels <= PA_CHANNELS_MAX);

    a->channels = channels;

    for (i = 0; i < a->channels; i++)
        a->values[i] = v;

    return a;
}

pa_volume_t pa_cvolume_avg(const pa_cvolume *a) {
    uint64_t sum = 0;
    int i;
    pa_assert(a);

    for (i = 0; i < a->channels; i++)
        sum += a->values[i];

    sum /= a->channels;

    return (pa_volume_t) sum;
}

pa_volume_t pa_sw_volume_multiply(pa_volume_t a, pa_volume_t b) {
    return pa_sw_volume_from_linear(pa_sw_volume_to_linear(a)* pa_sw_volume_to_linear(b));
}

#define USER_DECIBEL_RANGE 60

pa_volume_t pa_sw_volume_from_dB(double dB) {
    if (isinf(dB) < 0 || dB <= -USER_DECIBEL_RANGE)
        return PA_VOLUME_MUTED;

    return (pa_volume_t) ((dB/USER_DECIBEL_RANGE+1)*PA_VOLUME_NORM);
}

double pa_sw_volume_to_dB(pa_volume_t v) {
    if (v == PA_VOLUME_MUTED)
        return PA_DECIBEL_MININFTY;

    return ((double) v/PA_VOLUME_NORM-1)*USER_DECIBEL_RANGE;
}

pa_volume_t pa_sw_volume_from_linear(double v) {

    if (v <= 0)
        return PA_VOLUME_MUTED;

    if (v > .999 && v < 1.001)
        return PA_VOLUME_NORM;

    return pa_sw_volume_from_dB(20*log10(v));
}

double pa_sw_volume_to_linear(pa_volume_t v) {

    if (v == PA_VOLUME_MUTED)
        return 0;

    return pow(10, pa_sw_volume_to_dB(v)/20);
}

char *pa_cvolume_snprint(char *s, size_t l, const pa_cvolume *c) {
    unsigned channel;
    int first = 1;
    char *e;

    pa_assert(s);
    pa_assert(l > 0);
    pa_assert(c);

    *(e = s) = 0;

    for (channel = 0; channel < c->channels && l > 1; channel++) {
        l -= pa_snprintf(e, l, "%s%u: %3u%%",
                      first ? "" : " ",
                      channel,
                      (c->values[channel]*100)/PA_VOLUME_NORM);

        e = strchr(e, 0);
        first = 0;
    }

    return s;
}

/** Return non-zero if the volume of all channels is equal to the specified value */
int pa_cvolume_channels_equal_to(const pa_cvolume *a, pa_volume_t v) {
    unsigned c;
    pa_assert(a);

    for (c = 0; c < a->channels; c++)
        if (a->values[c] != v)
            return 0;

    return 1;
}

pa_cvolume *pa_sw_cvolume_multiply(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b) {
    unsigned i;

    pa_assert(dest);
    pa_assert(a);
    pa_assert(b);

    for (i = 0; i < a->channels && i < b->channels && i < PA_CHANNELS_MAX; i++) {

        dest->values[i] = pa_sw_volume_multiply(
            i < a->channels ? a->values[i] : PA_VOLUME_NORM,
            i < b->channels ? b->values[i] : PA_VOLUME_NORM);
    }

    dest->channels = i;

    return dest;
}

int pa_cvolume_valid(const pa_cvolume *v) {
    pa_assert(v);

    if (v->channels <= 0 || v->channels > PA_CHANNELS_MAX)
        return 0;

    return 1;
}