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
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/*
Copyright (C) 2020 dec05eba
This program 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 3 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "../include/sound.hpp"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <cmath>
#include <pulse/pulseaudio.h>
#include <pulse/mainloop.h>
#include <pulse/xmalloc.h>
#include <pulse/error.h>
static int sound_device_index = 0;
struct pa_handle {
pa_context *context;
pa_stream *stream;
pa_mainloop *mainloop;
const void *read_data;
size_t read_index, read_length;
int operation_success;
};
static void pa_sound_device_free(pa_handle *s) {
assert(s);
if (s->stream)
pa_stream_unref(s->stream);
if (s->context) {
pa_context_disconnect(s->context);
pa_context_unref(s->context);
}
if (s->mainloop)
pa_mainloop_free(s->mainloop);
pa_xfree(s);
}
static pa_handle* pa_sound_device_new(const char *server,
const char *name,
const char *dev,
const char *stream_name,
const pa_sample_spec *ss,
const pa_buffer_attr *attr,
int *rerror) {
pa_handle *p;
int error = PA_ERR_INTERNAL, r;
p = pa_xnew0(pa_handle, 1);
if (!(p->mainloop = pa_mainloop_new()))
goto fail;
if (!(p->context = pa_context_new(pa_mainloop_get_api(p->mainloop), name)))
goto fail;
if (pa_context_connect(p->context, server, PA_CONTEXT_NOFLAGS, NULL) < 0) {
error = pa_context_errno(p->context);
goto fail;
}
for (;;) {
pa_context_state_t state = pa_context_get_state(p->context);
if (state == PA_CONTEXT_READY)
break;
if (!PA_CONTEXT_IS_GOOD(state)) {
error = pa_context_errno(p->context);
goto fail;
}
pa_mainloop_iterate(p->mainloop, 1, NULL);
}
if (!(p->stream = pa_stream_new(p->context, stream_name, ss, NULL))) {
error = pa_context_errno(p->context);
goto fail;
}
r = pa_stream_connect_record(p->stream, dev, attr,
(pa_stream_flags_t)(PA_STREAM_INTERPOLATE_TIMING|PA_STREAM_ADJUST_LATENCY|PA_STREAM_AUTO_TIMING_UPDATE));
if (r < 0) {
error = pa_context_errno(p->context);
goto fail;
}
for (;;) {
pa_stream_state_t state = pa_stream_get_state(p->stream);
if (state == PA_STREAM_READY)
break;
if (!PA_STREAM_IS_GOOD(state)) {
error = pa_context_errno(p->context);
goto fail;
}
pa_mainloop_iterate(p->mainloop, 1, NULL);
}
return p;
fail:
if (rerror)
*rerror = error;
pa_sound_device_free(p);
return NULL;
}
// Returns a negative value on failure or if no data is available at the moment
static int pa_sound_device_read(pa_handle *p, void *data, size_t length) {
assert(p);
const int64_t timeout_ms = std::round((1000.0 / (double)pa_stream_get_sample_spec(p->stream)->rate) * 1000.0);
pa_mainloop_prepare(p->mainloop, timeout_ms * 1000);
pa_mainloop_poll(p->mainloop);
pa_mainloop_dispatch(p->mainloop);
if(pa_stream_readable_size(p->stream) < length)
return -1;
int r = pa_stream_peek(p->stream, &p->read_data, &p->read_length);
if(r != 0)
return -1;
if(p->read_length < length || !p->read_data) {
pa_stream_drop(p->stream);
return -1;
}
memcpy(data, p->read_data, length);
pa_stream_drop(p->stream);
return 0;
}
int sound_device_get_by_name(SoundDevice *device, const char *name, unsigned int num_channels, unsigned int period_frame_size) {
pa_sample_spec ss;
ss.format = PA_SAMPLE_S16LE;
ss.rate = 48000;
ss.channels = num_channels;
int error;
pa_buffer_attr buffer_attr;
buffer_attr.tlength = -1;
buffer_attr.prebuf = -1;
buffer_attr.minreq = -1;
buffer_attr.maxlength = period_frame_size * 2 * num_channels; // 2 bytes/sample, @num_channels channels
buffer_attr.fragsize = buffer_attr.maxlength;
// We want a unique stream name for every device which allows each input to be a different box in pipewire graph software
char stream_name[64];
snprintf(stream_name, sizeof(stream_name), "record-%d", sound_device_index);
++sound_device_index;
pa_handle *handle = pa_sound_device_new(nullptr, "gpu-screen-recorder", name, stream_name, &ss, &buffer_attr, &error);
if(!handle) {
fprintf(stderr, "pa_simple_new() failed: %s. Audio input device %s might not be valid\n", pa_strerror(error), name);
return -1;
}
int buffer_size = buffer_attr.maxlength;
void *buffer = malloc(buffer_size);
if(!buffer) {
fprintf(stderr, "failed to allocate buffer for audio\n");
pa_sound_device_free(handle);
return -1;
}
fprintf(stderr, "Using pulseaudio\n");
device->handle = handle;
device->buffer = buffer;
device->buffer_size = buffer_size;
device->frames = period_frame_size;
return 0;
}
void sound_device_close(SoundDevice *device) {
pa_sound_device_free((pa_handle*)device->handle);
free(device->buffer);
}
int sound_device_read_next_chunk(SoundDevice *device, void **buffer) {
if(pa_sound_device_read((pa_handle*)device->handle, device->buffer, device->buffer_size) < 0) {
//fprintf(stderr, "pa_simple_read() failed: %s\n", pa_strerror(error));
return -1;
}
*buffer = device->buffer;
return device->frames;
}
|
