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
|
/* PipeWire
* Copyright (C) 2018 Wim Taymans <wim.taymans@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <stdio.h>
#include <errno.h>
#include <time.h>
#include <math.h>
#include <sys/mman.h>
#include <spa/param/audio/format-utils.h>
#include <spa/param/props.h>
#include <pipewire/pipewire.h>
#define M_PI_M2 ( M_PI + M_PI )
#define DEFAULT_RATE 44100
#define DEFAULT_CHANNELS 2
#define DEFAULT_VOLUME 0.7
struct data {
struct pw_main_loop *loop;
struct pw_core *core;
struct pw_remote *remote;
struct pw_stream *stream;
double accumulator;
};
static void fill_f32(struct data *d, void *dest, int avail)
{
float *dst = dest, val;
int n_samples = avail / (sizeof(float) * DEFAULT_CHANNELS);
int i, c;
for (i = 0; i < n_samples; i++) {
d->accumulator += M_PI_M2 * 440 / DEFAULT_RATE;
if (d->accumulator >= M_PI_M2)
d->accumulator -= M_PI_M2;
val = sin(d->accumulator) * DEFAULT_VOLUME;
for (c = 0; c < DEFAULT_CHANNELS; c++)
*dst++ = val;
}
}
static void on_process(void *userdata)
{
struct data *data = userdata;
struct pw_buffer *b;
struct spa_buffer *buf;
uint8_t *p;
if ((b = pw_stream_dequeue_buffer(data->stream)) == NULL)
return;
buf = b->buffer;
if ((p = buf->datas[0].data) == NULL)
return;
fill_f32(data, p, buf->datas[0].maxsize);
buf->datas[0].chunk->size = buf->datas[0].maxsize;
pw_stream_queue_buffer(data->stream, b);
}
static const struct pw_stream_events stream_events = {
PW_VERSION_STREAM_EVENTS,
.process = on_process,
};
int main(int argc, char *argv[])
{
struct data data = { 0, };
const struct spa_pod *params[1];
uint8_t buffer[1024];
struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
pw_init(&argc, &argv);
data.loop = pw_main_loop_new(NULL);
data.stream = pw_stream_new_simple(
pw_main_loop_get_loop(data.loop),
"audio-src",
pw_properties_new(
PW_NODE_PROP_MEDIA, "Audio",
PW_NODE_PROP_CATEGORY, "Playback",
PW_NODE_PROP_ROLE, "Music",
NULL),
&stream_events,
&data);
data.remote = pw_stream_get_remote(data.stream);
params[0] = spa_format_audio_raw_build(&b, SPA_PARAM_EnumFormat,
&SPA_AUDIO_INFO_RAW_INIT(
.format = SPA_AUDIO_FORMAT_F32,
.channels = DEFAULT_CHANNELS,
.rate = DEFAULT_RATE ));
pw_stream_connect(data.stream,
PW_DIRECTION_OUTPUT,
argc > 1 ? atoi(argv[1]) : SPA_ID_INVALID,
PW_STREAM_FLAG_AUTOCONNECT |
PW_STREAM_FLAG_MAP_BUFFERS |
PW_STREAM_FLAG_RT_PROCESS,
params, 1);
pw_main_loop_run(data.loop);
pw_stream_destroy(data.stream);
pw_main_loop_destroy(data.loop);
return 0;
}
|
