aboutsummaryrefslogtreecommitdiffstats
path: root/src/mixer/pulse_mixer_plugin.c
blob: 3399d5baababb05619b594b0fa4bcfdf9787c2d0 (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
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
/*
 * 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 "conf.h"

#include <glib.h>
#include <pulse/volume.h>
#include <pulse/pulseaudio.h>

#include <string.h>

#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "pulse_mixer"

struct pulse_mixer {
	struct mixer base;

	const char *server;
	const char *sink;
	const char *output_name;

	uint32_t index;
	bool online;

	struct pa_context *context;
	struct pa_threaded_mainloop *mainloop;
	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");
}

/**
 * \brief waits for a pulseaudio operation to finish, frees it and
 *     unlocks the mainloop
 * \param operation the operation to wait for
 * \return true if operation has finished normally (DONE state),
 *     false otherwise
 */
static bool
pulse_wait_for_operation(struct pa_threaded_mainloop *mainloop,
			 struct pa_operation *operation)
{
	pa_operation_state_t state;

	assert(mainloop != NULL);
	assert(operation != NULL);

	state = pa_operation_get_state(operation);
	while (state == PA_OPERATION_RUNNING) {
		pa_threaded_mainloop_wait(mainloop);
		state = pa_operation_get_state(operation);
	}

	pa_operation_unref(operation);

	return state == PA_OPERATION_DONE;
}

static void
sink_input_cb(G_GNUC_UNUSED pa_context *context, const pa_sink_input_info *i,
	      int eol, void *userdata)
{

	struct pulse_mixer *pm = userdata;

	if (eol) {
		g_debug("eol error sink_input_cb");
		return;
	}

	if (i == NULL) {
		g_debug("Sink input callback failure");
		return;
	}

	g_debug("sink input cb %s, index %d ",i->name,i->index);

	if (strcmp(i->name,pm->output_name) == 0) {
		pm->index = i->index;
		pm->online = true;
		pm->volume = i->volume;
	} else
		g_debug("bad name");
}

static void
sink_input_vol(G_GNUC_UNUSED pa_context *context, const pa_sink_input_info *i,
	       int eol, void *userdata)
{

	struct pulse_mixer *pm = userdata;

	if (eol) {
		g_debug("eol error sink_input_vol");
		return;
	}

	if (i == NULL) {
		g_debug("Sink input callback failure");
		return;
	}

	g_debug("sink input vol %s, index %d ", i->name, i->index);

	pm->volume = i->volume;

	pa_threaded_mainloop_signal(pm->mainloop, 0);
}

static void
subscribe_cb(pa_context *c, pa_subscription_event_type_t t,
	     uint32_t idx, void *userdata)
{

	struct pulse_mixer *pm = userdata;

	g_debug("subscribe call back");

	switch (t & PA_SUBSCRIPTION_EVENT_FACILITY_MASK) {
	case PA_SUBSCRIPTION_EVENT_SINK_INPUT:
		if ((t & PA_SUBSCRIPTION_EVENT_TYPE_MASK) ==
		    PA_SUBSCRIPTION_EVENT_REMOVE &&
		    pm->index == idx)
			pm->online = false;
		else {
			pa_operation *o;

			o = pa_context_get_sink_input_info(c, idx,
							   sink_input_cb, pm);
			if (o == NULL) {
				g_debug("pa_context_get_sink_input_info() failed");
				return;
			}

			pa_operation_unref(o);
		}

		break;
	}
}

static void
context_state_cb(pa_context *context, void *userdata)
{
	struct pulse_mixer *pm = userdata;

	switch (pa_context_get_state(context)) {
	case PA_CONTEXT_READY: {
		pa_operation *o;

		pa_context_set_subscribe_callback(context, subscribe_cb, pm);

		o = pa_context_subscribe(context,
					 (pa_subscription_mask_t)PA_SUBSCRIPTION_MASK_SINK_INPUT,
					 NULL, NULL);
		if (o == NULL) {
			g_debug("pa_context_subscribe() failed");
			return;
		}

		pa_operation_unref(o);

		o = pa_context_get_sink_input_info_list(context,
							sink_input_cb, pm);
		if (o == NULL) {
			g_debug("pa_context_get_sink_input_info_list() failed");
			return;
		}

		pa_operation_unref(o);

		pa_threaded_mainloop_signal(pm->mainloop, 0);
		break;
	}

	case PA_CONTEXT_UNCONNECTED:
	case PA_CONTEXT_CONNECTING:
	case PA_CONTEXT_AUTHORIZING:
	case PA_CONTEXT_SETTING_NAME:
		break;
	case PA_CONTEXT_TERMINATED:
	case PA_CONTEXT_FAILED:
		pa_threaded_mainloop_signal(pm->mainloop, 0);
		break;
	}
}


static struct mixer *
pulse_mixer_init(const struct config_param *param,
		 G_GNUC_UNUSED GError **error_r)
{
	struct pulse_mixer *pm = g_new(struct pulse_mixer,1);
	mixer_init(&pm->base, &pulse_mixer_plugin);

	pm->online = false;

	pm->server = config_get_block_string(param, "server", NULL);
	pm->sink = config_get_block_string(param, "sink", NULL);
	pm->output_name = config_get_block_string(param, "name", NULL);

	return &pm->base;
}

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

	g_free(pm);
}

static bool
pulse_mixer_setup(struct pulse_mixer *pm, GError **error_r)
{
	pa_context_set_state_callback(pm->context, context_state_cb, pm);

	if (pa_context_connect(pm->context, pm->server,
			       (pa_context_flags_t)0, NULL) < 0) {
		g_set_error(error_r, pulse_mixer_quark(), 0,
			    "pa_context_connect() has failed");
		return false;
	}

	pa_threaded_mainloop_lock(pm->mainloop);

	if (pa_threaded_mainloop_start(pm->mainloop) < 0) {
		pa_threaded_mainloop_unlock(pm->mainloop);
		g_set_error(error_r, pulse_mixer_quark(), 0,
			    "pa_threaded_mainloop_start() has failed");
		return false;
	}

	pa_threaded_mainloop_wait(pm->mainloop);

	if (pa_context_get_state(pm->context) != PA_CONTEXT_READY) {
		g_set_error(error_r, pulse_mixer_quark(), 0,
			    "failed to connect: %s",
			    pa_strerror(pa_context_errno(pm->context)));
		pa_threaded_mainloop_unlock(pm->mainloop);
		return false;
	}

	pa_threaded_mainloop_unlock(pm->mainloop);

	return true;
}

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

	g_debug("pulse mixer open");

	pm->index = 0;
	pm->online = false;

	pm->mainloop = pa_threaded_mainloop_new();
	if (pm->mainloop == NULL) {
		g_set_error(error_r, pulse_mixer_quark(), 0,
			    "pa_threaded_mainloop_new() has failed");
		return false;
	}

	pm->context = pa_context_new(pa_threaded_mainloop_get_api(pm->mainloop),
				     "Mixer mpd");
	if (pm->context == NULL) {
		pa_threaded_mainloop_stop(pm->mainloop);
		pa_threaded_mainloop_free(pm->mainloop);
		g_set_error(error_r, pulse_mixer_quark(), 0,
			    "pa_context_new() has failed");
		return false;
	}

	if (!pulse_mixer_setup(pm, error_r)) {
		pa_threaded_mainloop_stop(pm->mainloop);
		pa_context_disconnect(pm->context);
		pa_context_unref(pm->context);
		pa_threaded_mainloop_free(pm->mainloop);
		return false;
	}

	return true;
}

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

	pa_threaded_mainloop_stop(pm->mainloop);
	pa_context_disconnect(pm->context);
	pa_context_unref(pm->context);
	pa_threaded_mainloop_free(pm->mainloop);

	pm->online = false;
}

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

	pa_threaded_mainloop_lock(pm->mainloop);

	if (!pm->online) {
		pa_threaded_mainloop_unlock(pm->mainloop);
		return false;
	}

	o = pa_context_get_sink_input_info(pm->context, pm->index,
					   sink_input_vol, pm);
	if (o == NULL) {
		pa_threaded_mainloop_unlock(pm->mainloop);
		g_set_error(error_r, pulse_mixer_quark(), 0,
			    "pa_context_get_sink_input_info() has failed");
		return false;
	}

	if (!pulse_wait_for_operation(pm->mainloop, o)) {
		pa_threaded_mainloop_unlock(pm->mainloop);
		g_set_error(error_r, pulse_mixer_quark(), 0,
			    "failed to read PulseAudio volume");
		return false;
	}

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

	pa_threaded_mainloop_unlock(pm->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->mainloop);

	if (!pm->online) {
		pa_threaded_mainloop_unlock(pm->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->context, pm->index,
					     &cvolume, NULL, NULL);
	pa_threaded_mainloop_unlock(pm->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,
};