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
|
/* $Id$ */
/***
This file is part of polypaudio.
polypaudio is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
polypaudio 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 General Public License
along with polypaudio; 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 <assert.h>
#include <math.h>
#include "sample.h"
size_t pa_frame_size(const struct pa_sample_spec *spec) {
size_t b = 1;
assert(spec);
switch (spec->format) {
case PA_SAMPLE_U8:
case PA_SAMPLE_ULAW:
case PA_SAMPLE_ALAW:
b = 1;
break;
case PA_SAMPLE_S16LE:
case PA_SAMPLE_S16BE:
b = 2;
break;
case PA_SAMPLE_FLOAT32LE:
case PA_SAMPLE_FLOAT32BE:
b = 4;
break;
default:
assert(0);
}
return b * spec->channels;
}
size_t pa_bytes_per_second(const struct pa_sample_spec *spec) {
assert(spec);
return spec->rate*pa_frame_size(spec);
}
pa_usec_t pa_bytes_to_usec(size_t length, const struct pa_sample_spec *spec) {
assert(spec);
return (pa_usec_t) (((double) length/pa_frame_size(spec)*1000000)/spec->rate);
}
int pa_sample_spec_valid(const struct pa_sample_spec *spec) {
assert(spec);
if (!spec->rate || !spec->channels)
return 0;
if (spec->format >= PA_SAMPLE_MAX)
return 0;
return 1;
}
int pa_sample_spec_equal(const struct pa_sample_spec*a, const struct pa_sample_spec*b) {
assert(a && b);
return (a->format == b->format) && (a->rate == b->rate) && (a->channels == b->channels);
}
void pa_sample_spec_snprint(char *s, size_t l, const struct pa_sample_spec *spec) {
static const char* const table[]= {
[PA_SAMPLE_U8] = "U8",
[PA_SAMPLE_ALAW] = "ALAW",
[PA_SAMPLE_ULAW] = "ULAW",
[PA_SAMPLE_S16LE] = "S16LE",
[PA_SAMPLE_S16BE] = "S16BE",
[PA_SAMPLE_FLOAT32LE] = "FLOAT32LE",
[PA_SAMPLE_FLOAT32BE] = "FLOAT32BE",
};
assert(pa_sample_spec_valid(spec));
snprintf(s, l, "%s %uch %uHz", table[spec->format], spec->channels, spec->rate);
}
pa_volume_t pa_volume_multiply(pa_volume_t a, pa_volume_t b) {
uint64_t p = a;
p *= b;
p /= PA_VOLUME_NORM;
return (pa_volume_t) p;
}
pa_volume_t pa_volume_from_dB(double f) {
if (f <= PA_DECIBEL_MININFTY)
return PA_VOLUME_MUTED;
return (pa_volume_t) (pow(10, f/20)*PA_VOLUME_NORM);
}
double pa_volume_to_dB(pa_volume_t v) {
if (v == PA_VOLUME_MUTED)
return PA_DECIBEL_MININFTY;
return 20*log10((double) v/PA_VOLUME_NORM);
}
void pa_bytes_snprint(char *s, size_t l, off_t v) {
if (v >= (off_t) 1024*1024*1024)
snprintf(s, l, "%0.1f GB", (double) v/1024/1024/1024);
else if (v >= (off_t) 1024*1024)
snprintf(s, l, "%0.1f MB", (double) v/1024/1024);
else if (v >= (off_t) 1024)
snprintf(s, l, "%0.1f KB", (double) v/1024);
else
snprintf(s, l, "%u B", (unsigned) v);
}
|
