aboutsummaryrefslogtreecommitdiffstats
path: root/src/OutputControl.cxx
blob: 27f2802314d15827a1ea95ec7a34b5e79f39a2c0 (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
/*
 * Copyright (C) 2003-2013 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 "config.h"
#include "OutputControl.hxx"
#include "OutputThread.hxx"
#include "OutputInternal.hxx"
#include "OutputPlugin.hxx"
#include "OutputError.hxx"
#include "MixerPlugin.hxx"
#include "MixerControl.hxx"
#include "notify.hxx"
#include "filter/ReplayGainFilterPlugin.hxx"
#include "FilterPlugin.hxx"
#include "util/Error.hxx"
#include "Log.hxx"

#include <glib.h>

#include <assert.h>
#include <stdlib.h>

/** after a failure, wait this number of seconds before
    automatically reopening the device */
static constexpr unsigned REOPEN_AFTER = 10;

struct notify audio_output_client_notify;

/**
 * Waits for command completion.
 *
 * @param ao the #audio_output instance; must be locked
 */
static void ao_command_wait(struct audio_output *ao)
{
	while (ao->command != AO_COMMAND_NONE) {
		ao->mutex.unlock();
		audio_output_client_notify.Wait();
		ao->mutex.lock();
	}
}

/**
 * Sends a command to the #audio_output object, but does not wait for
 * completion.
 *
 * @param ao the #audio_output instance; must be locked
 */
static void ao_command_async(struct audio_output *ao,
			     enum audio_output_command cmd)
{
	assert(ao->command == AO_COMMAND_NONE);
	ao->command = cmd;
	ao->cond.signal();
}

/**
 * Sends a command to the #audio_output object and waits for
 * completion.
 *
 * @param ao the #audio_output instance; must be locked
 */
static void
ao_command(struct audio_output *ao, enum audio_output_command cmd)
{
	ao_command_async(ao, cmd);
	ao_command_wait(ao);
}

/**
 * Lock the #audio_output object and execute the command
 * synchronously.
 */
static void
ao_lock_command(struct audio_output *ao, enum audio_output_command cmd)
{
	const ScopeLock protect(ao->mutex);
	ao_command(ao, cmd);
}

void
audio_output_set_replay_gain_mode(struct audio_output *ao,
				  ReplayGainMode mode)
{
	if (ao->replay_gain_filter != nullptr)
		replay_gain_filter_set_mode(ao->replay_gain_filter, mode);
	if (ao->other_replay_gain_filter != nullptr)
		replay_gain_filter_set_mode(ao->other_replay_gain_filter, mode);
}

void
audio_output_enable(struct audio_output *ao)
{
	if (!ao->thread.IsDefined()) {
		if (ao->plugin->enable == nullptr) {
			/* don't bother to start the thread now if the
			   device doesn't even have a enable() method;
			   just assign the variable and we're done */
			ao->really_enabled = true;
			return;
		}

		audio_output_thread_start(ao);
	}

	ao_lock_command(ao, AO_COMMAND_ENABLE);
}

void
audio_output_disable(struct audio_output *ao)
{
	if (!ao->thread.IsDefined()) {
		if (ao->plugin->disable == nullptr)
			ao->really_enabled = false;
		else
			/* if there's no thread yet, the device cannot
			   be enabled */
			assert(!ao->really_enabled);

		return;
	}

	ao_lock_command(ao, AO_COMMAND_DISABLE);
}

/**
 * Object must be locked (and unlocked) by the caller.
 */
static bool
audio_output_open(struct audio_output *ao,
		  const AudioFormat audio_format,
		  const MusicPipe &mp)
{
	bool open;

	assert(ao != nullptr);
	assert(ao->allow_play);
	assert(audio_format.IsValid());

	if (ao->fail_timer != nullptr) {
		g_timer_destroy(ao->fail_timer);
		ao->fail_timer = nullptr;
	}

	if (ao->open && audio_format == ao->in_audio_format) {
		assert(ao->pipe == &mp ||
		       (ao->always_on && ao->pause));

		if (ao->pause) {
			ao->chunk = nullptr;
			ao->pipe = &mp;

			/* unpause with the CANCEL command; this is a
			   hack, but suits well for forcing the thread
			   to leave the ao_pause() thread, and we need
			   to flush the device buffer anyway */

			/* we're not using audio_output_cancel() here,
			   because that function is asynchronous */
			ao_command(ao, AO_COMMAND_CANCEL);
		}

		return true;
	}

	ao->in_audio_format = audio_format;
	ao->chunk = nullptr;

	ao->pipe = &mp;

	if (!ao->thread.IsDefined())
		audio_output_thread_start(ao);

	ao_command(ao, ao->open ? AO_COMMAND_REOPEN : AO_COMMAND_OPEN);
	open = ao->open;

	if (open && ao->mixer != nullptr) {
		Error error;
		if (!mixer_open(ao->mixer, error))
			FormatWarning(output_domain,
				      "Failed to open mixer for '%s'",
				      ao->name);
	}

	return open;
}

/**
 * Same as audio_output_close(), but expects the lock to be held by
 * the caller.
 */
static void
audio_output_close_locked(struct audio_output *ao)
{
	assert(ao != nullptr);
	assert(ao->allow_play);

	if (ao->mixer != nullptr)
		mixer_auto_close(ao->mixer);

	assert(!ao->open || ao->fail_timer == nullptr);

	if (ao->open)
		ao_command(ao, AO_COMMAND_CLOSE);
	else if (ao->fail_timer != nullptr) {
		g_timer_destroy(ao->fail_timer);
		ao->fail_timer = nullptr;
	}
}

bool
audio_output_update(struct audio_output *ao,
		    const AudioFormat audio_format,
		    const MusicPipe &mp)
{
	const ScopeLock protect(ao->mutex);

	if (ao->enabled && ao->really_enabled) {
		if (ao->fail_timer == nullptr ||
		    g_timer_elapsed(ao->fail_timer, nullptr) > REOPEN_AFTER) {
			return audio_output_open(ao, audio_format, mp);
		}
	} else if (audio_output_is_open(ao))
		audio_output_close_locked(ao);

	return false;
}

void
audio_output_play(struct audio_output *ao)
{
	const ScopeLock protect(ao->mutex);

	assert(ao->allow_play);

	if (audio_output_is_open(ao) && !ao->in_playback_loop &&
	    !ao->woken_for_play) {
		ao->woken_for_play = true;
		ao->cond.signal();
	}
}

void audio_output_pause(struct audio_output *ao)
{
	if (ao->mixer != nullptr && ao->plugin->pause == nullptr)
		/* the device has no pause mode: close the mixer,
		   unless its "global" flag is set (checked by
		   mixer_auto_close()) */
		mixer_auto_close(ao->mixer);

	const ScopeLock protect(ao->mutex);

	assert(ao->allow_play);
	if (audio_output_is_open(ao))
		ao_command_async(ao, AO_COMMAND_PAUSE);
}

void
audio_output_drain_async(struct audio_output *ao)
{
	const ScopeLock protect(ao->mutex);

	assert(ao->allow_play);
	if (audio_output_is_open(ao))
		ao_command_async(ao, AO_COMMAND_DRAIN);
}

void audio_output_cancel(struct audio_output *ao)
{
	const ScopeLock protect(ao->mutex);

	if (audio_output_is_open(ao)) {
		ao->allow_play = false;
		ao_command_async(ao, AO_COMMAND_CANCEL);
	}
}

void
audio_output_allow_play(struct audio_output *ao)
{
	const ScopeLock protect(ao->mutex);

	ao->allow_play = true;
	if (audio_output_is_open(ao))
		ao->cond.signal();
}

void
audio_output_release(struct audio_output *ao)
{
	if (ao->always_on)
		audio_output_pause(ao);
	else
		audio_output_close(ao);
}

void audio_output_close(struct audio_output *ao)
{
	assert(ao != nullptr);
	assert(!ao->open || ao->fail_timer == nullptr);

	const ScopeLock protect(ao->mutex);
	audio_output_close_locked(ao);
}

void audio_output_finish(struct audio_output *ao)
{
	audio_output_close(ao);

	assert(ao->fail_timer == nullptr);

	if (ao->thread.IsDefined()) {
		assert(ao->allow_play);
		ao_lock_command(ao, AO_COMMAND_KILL);
		ao->thread.Join();
	}

	audio_output_free(ao);
}