forked from abrasive/shairport
-
Notifications
You must be signed in to change notification settings - Fork 0
/
audio_ao.c
129 lines (113 loc) · 3.82 KB
/
audio_ao.c
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
/*
* libao output driver. This file is part of Shairport.
* Copyright (c) James Laird 2013
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include <stdio.h>
#include <unistd.h>
#include <memory.h>
#include <ao/ao.h>
#include "common.h"
#include "audio.h"
ao_device *dev = NULL;
static void help(void) {
printf(" -d driver set the output driver\n"
" -o name=value set an arbitrary ao option\n"
" -i id shorthand for -o id=<id>\n"
" -n name shorthand for -o dev=<name> -o dsp=<name>\n"
);
}
static int init(int argc, char **argv) {
ao_initialize();
int driver = ao_default_driver_id();
ao_option *ao_opts = NULL;
optind = 1; // optind=0 is equivalent to optind=1 plus special behaviour
argv--; // so we shift the arguments to satisfy getopt()
argc++;
// some platforms apparently require optreset = 1; - which?
int opt;
char *mid;
while ((opt = getopt(argc, argv, "d:i:n:o:")) > 0) {
switch (opt) {
case 'd':
driver = ao_driver_id(optarg);
if (driver < 0)
die("could not find ao driver %s", optarg);
break;
case 'i':
ao_append_option(&ao_opts, "id", optarg);
break;
case 'n':
ao_append_option(&ao_opts, "dev", optarg);
// Old libao versions (for example, 0.8.8) only support
// "dsp" instead of "dev".
ao_append_option(&ao_opts, "dsp", optarg);
break;
case 'o':
mid = strchr(optarg, '=');
if (!mid)
die("Expected an = in audio option %s", optarg);
*mid = 0;
ao_append_option(&ao_opts, optarg, mid+1);
break;
default:
help();
die("Invalid audio option -%c specified", opt);
}
}
if (optind < argc)
die("Invalid audio argument: %s", argv[optind]);
ao_sample_format fmt;
memset(&fmt, 0, sizeof(fmt));
fmt.bits = 16;
fmt.rate = 44100;
fmt.channels = 2;
fmt.byte_format = AO_FMT_NATIVE;
dev = ao_open_live(driver, &fmt, ao_opts);
return dev ? 0 : 1;
}
static void deinit(void) {
if (dev)
ao_close(dev);
dev = NULL;
ao_shutdown();
}
static void start(int sample_rate) {
if (sample_rate != 44100)
die("unexpected sample rate!");
}
static void play(short buf[], int samples) {
ao_play(dev, (char*)buf, samples*4);
}
static void stop(void) {
}
audio_output audio_ao = {
.name = "ao",
.help = &help,
.init = &init,
.deinit = &deinit,
.start = &start,
.stop = &stop,
.play = &play,
.volume = NULL
};