aboutsummaryrefslogtreecommitdiffstats
path: root/src/mixer/pulse_mixer_plugin.c
blob: b33ef80ae4015ec356a7d088e58b158f567da8b5 (plain) (blame)
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
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
/*
 * Copyright (C) 2003-2009 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * 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 2 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, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "mixer_api.h"
#include "output/pulse_output_plugin.h"
#include "conf.h"
#include "event_pipe.h"

#include <glib.h>

#include <pulse/thread-mainloop.h>
#include <pulse/context.h>
#include <pulse/introspect.h>
#include <pulse/stream.h>
#include <pulse/subscribe.h>
#include <pulse/error.h>

#include <assert.h>
#include <string.h>

#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "pulse_mixer"

struct pulse_mixer {
	struct mixer base;

	struct pulse_output *output;

	bool online;
	struct pa_cvolume volume;

};

/**
 * The quark used for GError.domain.
 */
static inline GQuark
pulse_mixer_quark(void)
{
	return g_quark_from_static_string("pulse_mixer");
}

static void
pulse_mixer_offline(struct pulse_mixer *pm)
{
	if (!pm->online)
		return;

	pm->online = false;

	event_pipe_emit(PIPE_EVENT_MIXER);
}

/**
 * Callback invoked by pulse_mixer_update().  Receives the new mixer
 * value.
 */
static void
pulse_mixer_volume_cb(G_GNUC_UNUSED pa_context *context, const pa_sink_input_info *i,
		      int eol, void *userdata)
{
	struct pulse_mixer *pm = userdata;

	if (eol)
		return;

	if (i == NULL) {
		pulse_mixer_offline(pm);
		return;
	}

	pm->online = true;
	pm->volume = i->volume;

	event_pipe_emit(PIPE_EVENT_MIXER);
}

static void
pulse_mixer_update(struct pulse_mixer *pm)
{
	pa_operation *o;

	assert(pm->output->stream != NULL);

	if (pm->output->context == NULL)
		return;

	o = pa_context_get_sink_input_info(pm->output->context,
					   pa_stream_get_index(pm->output->stream),
					   pulse_mixer_volume_cb, pm);
	if (o == NULL) {
		g_warning("pa_context_get_sink_input_info() failed: %s",
			  pa_strerror(pa_context_errno(pm->output->context)));
		pulse_mixer_offline(pm);
		return;
	}

	pa_operation_unref(o);
}

static void
pulse_mixer_handle_sink_input(struct pulse_mixer *pm,
			      pa_subscription_event_type_t t,
			      uint32_t idx)
{
	if (pm->output->stream == NULL) {
		pulse_mixer_offline(pm);
		return;
	}

	if (idx != pa_stream_get_index(pm->output->stream))
		return;

	if (t == PA_SUBSCRIPTION_EVENT_NEW ||
	    t == PA_SUBSCRIPTION_EVENT_CHANGE)
		pulse_mixer_update(pm);
}

static void
pulse_mixer_subscribe_cb(G_GNUC_UNUSED pa_context *c, pa_subscription_event_type_t t,
	     uint32_t idx, void *userdata)
{
	struct pulse_mixer *pm = userdata;

	switch (t & PA_SUBSCRIPTION_EVENT_FACILITY_MASK) {
	case PA_SUBSCRIPTION_EVENT_SINK_INPUT:
		pulse_mixer_handle_sink_input(pm,
					      t & PA_SUBSCRIPTION_EVENT_TYPE_MASK,
					      idx);
		break;
	}
}

static void
pulxe_mixer_context_state_cb(pa_context *context, void *userdata)
{
	struct pulse_mixer *pm = userdata;
	pa_operation *o;

	/* pass event to the output's callback function */
	pulse_output_context_state_cb(context, pm->output);

	if (pa_context_get_state(context) == PA_CONTEXT_READY) {
		/* subscribe to sink_input events after the connection
		   has been established */

		o = pa_context_subscribe(context,
					 (pa_subscription_mask_t)PA_SUBSCRIPTION_MASK_SINK_INPUT,
					 NULL, NULL);
		if (o == NULL) {
			g_warning("pa_context_subscribe() failed: %s",
				  pa_strerror(pa_context_errno(context)));
			return;
		}

		pa_operation_unref(o);

		if (pm->output->stream != NULL)
			pulse_mixer_update(pm);
	}
}

static struct mixer *
pulse_mixer_init(void *ao, G_GNUC_UNUSED const struct config_param *param,
		 GError **error_r)
{
	struct pulse_mixer *pm;

	if (ao == NULL) {
		g_set_error(error_r, pulse_mixer_quark(), 0,
			    "The pulse mixer cannot work without the audio output");
		return false;
	}

	pm = g_new(struct pulse_mixer,1);
	mixer_init(&pm->base, &pulse_mixer_plugin);

	pm->output = ao;
	pm->online = false;

	pa_threaded_mainloop_lock(pm->output->mainloop);

	/* register callbacks (override the output's context state
	   callback) */

	pa_context_set_state_callback(pm->output->context,
				      pulxe_mixer_context_state_cb, pm);
	pa_context_set_subscribe_callback(pm->output->context,
					  pulse_mixer_subscribe_cb, pm);

	/* check the current state now (we might have missed the first
	   events!) */
	pulxe_mixer_context_state_cb(pm->output->context, pm);

	pa_threaded_mainloop_unlock(pm->output->mainloop);

	return &pm->base;
}

static void
pulse_mixer_finish(struct mixer *data)
{
	struct pulse_mixer *pm = (struct pulse_mixer *) data;

	/* restore callbacks */

	pa_threaded_mainloop_lock(pm->output->mainloop);

	if (pm->output->context != NULL) {
		pa_context_set_state_callback(pm->output->context,
					      pulse_output_context_state_cb,
					      pm->output);
		pa_context_set_subscribe_callback(pm->output->context,
						  NULL, NULL);
	}

	pa_threaded_mainloop_unlock(pm->output->mainloop);

	/* free resources */

	g_free(pm);
}

static bool
pulse_mixer_open(struct mixer *data, G_GNUC_UNUSED GError **error_r)
{
	struct pulse_mixer *pm = (struct pulse_mixer *) data;

	pa_threaded_mainloop_lock(pm->output->mainloop);
	if (pm->output->stream != NULL &&
	    pa_stream_get_state(pm->output->stream) == PA_STREAM_READY)
		pulse_mixer_update(pm);
	pa_threaded_mainloop_unlock(pm->output->mainloop);

	return true;
}

static void
pulse_mixer_close(struct mixer *data)
{
	struct pulse_mixer *pm = (struct pulse_mixer *) data;

	pulse_mixer_offline(pm);
}

static int
pulse_mixer_get_volume(struct mixer *mixer, G_GNUC_UNUSED GError **error_r)
{
	struct pulse_mixer *pm = (struct pulse_mixer *) mixer;
	int ret;

	pa_threaded_mainloop_lock(pm->output->mainloop);

	ret = pm->online
		? (int)((100*(pa_cvolume_avg(&pm->volume)+1))/PA_VOLUME_NORM)
		: -1;

	pa_threaded_mainloop_unlock(pm->output->mainloop);

	return ret;
}

static bool
pulse_mixer_set_volume(struct mixer *mixer, unsigned volume, GError **error_r)
{
	struct pulse_mixer *pm = (struct pulse_mixer *) mixer;
	struct pa_cvolume cvolume;
	pa_operation *o;

	pa_threaded_mainloop_lock(pm->output->mainloop);

	if (!pm->online || pm->output->stream == NULL ||
	    pm->output->context == NULL) {
		pa_threaded_mainloop_unlock(pm->output->mainloop);
		g_set_error(error_r, pulse_mixer_quark(), 0, "disconnected");
		return false;
	}

	pa_cvolume_set(&cvolume, pm->volume.channels,
		       (pa_volume_t)volume * PA_VOLUME_NORM / 100 + 0.5);

	o = pa_context_set_sink_input_volume(pm->output->context,
					     pa_stream_get_index(pm->output->stream),
					     &cvolume, NULL, NULL);
	pa_threaded_mainloop_unlock(pm->output->mainloop);
	if (o == NULL) {
		g_set_error(error_r, pulse_mixer_quark(), 0,
			    "failed to set PulseAudio volume");
		return false;
	}

	pa_operation_unref(o);

	return true;
}

const struct mixer_plugin pulse_mixer_plugin = {
	.init = pulse_mixer_init,
	.finish = pulse_mixer_finish,
	.open = pulse_mixer_open,
	.close = pulse_mixer_close,
	.get_volume = pulse_mixer_get_volume,
	.set_volume = pulse_mixer_set_volume,
};