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
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
/**
* @file alsa_src.c ALSA sound driver - recorder
*
* Copyright (C) 2010 Creytiv.com
*/
#define _DEFAULT_SOURCE 1
#define _POSIX_SOURCE 1
#include <sys/types.h>
#include <sys/time.h>
#include <stdlib.h>
#include <unistd.h>
#include <alsa/asoundlib.h>
#include <pthread.h>
#include <re.h>
#include <rem.h>
#include <baresip.h>
#include "alsa.h"
struct ausrc_st {
const struct ausrc *as; /* pointer to base-class (inheritance) */
pthread_t thread;
bool run;
snd_pcm_t *read;
int16_t *sampv;
void *xsampv;
size_t sampc;
ausrc_read_h *rh;
void *arg;
struct ausrc_prm prm;
char *device;
enum aufmt aufmt;
};
static void ausrc_destructor(void *arg)
{
struct ausrc_st *st = arg;
/* Wait for termination of other thread */
if (st->run) {
debug("alsa: stopping recording thread (%s)\n", st->device);
st->run = false;
(void)pthread_join(st->thread, NULL);
}
if (st->read)
snd_pcm_close(st->read);
mem_deref(st->sampv);
mem_deref(st->xsampv);
mem_deref(st->device);
}
static void *read_thread(void *arg)
{
struct ausrc_st *st = arg;
int num_frames;
int err;
num_frames = st->prm.srate * st->prm.ptime / 1000;
/* Start */
err = snd_pcm_start(st->read);
if (err) {
warning("alsa: could not start ausrc device '%s' (%s)\n",
st->device, snd_strerror(err));
goto out;
}
while (st->run) {
size_t sampc;
void *sampv;
if (st->aufmt == AUFMT_S16LE)
sampv = st->sampv;
else
sampv = st->xsampv;
err = snd_pcm_readi(st->read, sampv, num_frames);
if (err == -EPIPE) {
snd_pcm_prepare(st->read);
continue;
}
else if (err <= 0) {
continue;
}
sampc = err * st->prm.ch;
if (st->aufmt != AUFMT_S16LE) {
auconv_to_s16(st->sampv, st->aufmt,
st->xsampv, sampc);
}
st->rh(st->sampv, sampc, st->arg);
}
out:
return NULL;
}
int alsa_src_alloc(struct ausrc_st **stp, const struct ausrc *as,
struct media_ctx **ctx,
struct ausrc_prm *prm, const char *device,
ausrc_read_h *rh, ausrc_error_h *errh, void *arg)
{
struct ausrc_st *st;
snd_pcm_format_t pcmfmt;
int num_frames;
int err;
(void)ctx;
(void)errh;
if (!stp || !as || !prm || !rh)
return EINVAL;
if (!str_isset(device))
device = alsa_dev;
st = mem_zalloc(sizeof(*st), ausrc_destructor);
if (!st)
return ENOMEM;
err = str_dup(&st->device, device);
if (err)
goto out;
st->prm = *prm;
st->as = as;
st->rh = rh;
st->arg = arg;
st->aufmt = alsa_sample_format;
st->sampc = prm->srate * prm->ch * prm->ptime / 1000;
num_frames = st->prm.srate * st->prm.ptime / 1000;
st->sampv = mem_alloc(2 * st->sampc, NULL);
if (!st->sampv) {
err = ENOMEM;
goto out;
}
if (st->aufmt != AUFMT_S16LE) {
size_t sz = aufmt_sample_size(st->aufmt) * st->sampc;
st->xsampv = mem_alloc(sz, NULL);
if (!st->xsampv) {
err = ENOMEM;
goto out;
}
}
err = snd_pcm_open(&st->read, st->device, SND_PCM_STREAM_CAPTURE, 0);
if (err < 0) {
warning("alsa: could not open ausrc device '%s' (%s)\n",
st->device, snd_strerror(err));
goto out;
}
pcmfmt = aufmt_to_alsaformat(st->aufmt);
if (pcmfmt == SND_PCM_FORMAT_UNKNOWN) {
warning("alsa: unknown sample format '%s'\n",
aufmt_name(st->aufmt));
err = EINVAL;
goto out;
}
err = alsa_reset(st->read, st->prm.srate, st->prm.ch, num_frames,
pcmfmt);
if (err) {
warning("alsa: could not reset source '%s' (%s)\n",
st->device, snd_strerror(err));
goto out;
}
st->run = true;
err = pthread_create(&st->thread, NULL, read_thread, st);
if (err) {
st->run = false;
goto out;
}
debug("alsa: recording started (%s)\n", st->device);
out:
if (err)
mem_deref(st);
else
*stp = st;
return err;
}
|
