aboutsummaryrefslogtreecommitdiffstats
path: root/src/OutputInternal.hxx
blob: 7e615290e4cca4c0f71b3973cc5fa5e48a4459ed (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
/*
 * 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.
 */

#ifndef MPD_OUTPUT_INTERNAL_HXX
#define MPD_OUTPUT_INTERNAL_HXX

#include "AudioFormat.hxx"
#include "pcm/PcmBuffer.hxx"
#include "thread/Mutex.hxx"
#include "thread/Cond.hxx"

#include <time.h>

class Error;
class Filter;
class MusicPipe;
struct config_param;
typedef struct _GThread GThread;
typedef struct _GTimer GTimer;

enum audio_output_command {
	AO_COMMAND_NONE = 0,
	AO_COMMAND_ENABLE,
	AO_COMMAND_DISABLE,
	AO_COMMAND_OPEN,

	/**
	 * This command is invoked when the input audio format
	 * changes.
	 */
	AO_COMMAND_REOPEN,

	AO_COMMAND_CLOSE,
	AO_COMMAND_PAUSE,

	/**
	 * Drains the internal (hardware) buffers of the device.  This
	 * operation may take a while to complete.
	 */
	AO_COMMAND_DRAIN,

	AO_COMMAND_CANCEL,
	AO_COMMAND_KILL
};

struct audio_output {
	/**
	 * The device's configured display name.
	 */
	const char *name;

	/**
	 * The plugin which implements this output device.
	 */
	const struct audio_output_plugin *plugin;

	/**
	 * The #mixer object associated with this audio output device.
	 * May be NULL if none is available, or if software volume is
	 * configured.
	 */
	class Mixer *mixer;

	/**
	 * Will this output receive tags from the decoder?  The
	 * default is true, but it may be configured to false to
	 * suppress sending tags to the output.
	 */
	bool tags;

	/**
	 * Shall this output always play something (i.e. silence),
	 * even when playback is stopped?
	 */
	bool always_on;

	/**
	 * Has the user enabled this device?
	 */
	bool enabled;

	/**
	 * Is this device actually enabled, i.e. the "enable" method
	 * has succeeded?
	 */
	bool really_enabled;

	/**
	 * Is the device (already) open and functional?
	 *
	 * This attribute may only be modified by the output thread.
	 * It is protected with #mutex: write accesses inside the
	 * output thread and read accesses outside of it may only be
	 * performed while the lock is held.
	 */
	bool open;

	/**
	 * Is the device paused?  i.e. the output thread is in the
	 * ao_pause() loop.
	 */
	bool pause;

	/**
	 * When this flag is set, the output thread will not do any
	 * playback.  It will wait until the flag is cleared.
	 *
	 * This is used to synchronize the "clear" operation on the
	 * shared music pipe during the CANCEL command.
	 */
	bool allow_play;

	/**
	 * If not NULL, the device has failed, and this timer is used
	 * to estimate how long it should stay disabled (unless
	 * explicitly reopened with "play").
	 */
	GTimer *fail_timer;

	/**
	 * The configured audio format.
	 */
	AudioFormat config_audio_format;

	/**
	 * The audio_format in which audio data is received from the
	 * player thread (which in turn receives it from the decoder).
	 */
	AudioFormat in_audio_format;

	/**
	 * The audio_format which is really sent to the device.  This
	 * is basically config_audio_format (if configured) or
	 * in_audio_format, but may have been modified by
	 * plugin->open().
	 */
	AudioFormat out_audio_format;

	/**
	 * The buffer used to allocate the cross-fading result.
	 */
	PcmBuffer cross_fade_buffer;

	/**
	 * The filter object of this audio output.  This is an
	 * instance of chain_filter_plugin.
	 */
	Filter *filter;

	/**
	 * The replay_gain_filter_plugin instance of this audio
	 * output.
	 */
	Filter *replay_gain_filter;

	/**
	 * The serial number of the last replay gain info.  0 means no
	 * replay gain info was available.
	 */
	unsigned replay_gain_serial;

	/**
	 * The replay_gain_filter_plugin instance of this audio
	 * output, to be applied to the second chunk during
	 * cross-fading.
	 */
	Filter *other_replay_gain_filter;

	/**
	 * The serial number of the last replay gain info by the
	 * "other" chunk during cross-fading.
	 */
	unsigned other_replay_gain_serial;

	/**
	 * The convert_filter_plugin instance of this audio output.
	 * It is the last item in the filter chain, and is responsible
	 * for converting the input data into the appropriate format
	 * for this audio output.
	 */
	Filter *convert_filter;

	/**
	 * The thread handle, or NULL if the output thread isn't
	 * running.
	 */
	GThread *thread;

	/**
	 * The next command to be performed by the output thread.
	 */
	enum audio_output_command command;

	/**
	 * The music pipe which provides music chunks to be played.
	 */
	const MusicPipe *pipe;

	/**
	 * This mutex protects #open, #fail_timer, #chunk and
	 * #chunk_finished.
	 */
	Mutex mutex;

	/**
	 * This condition object wakes up the output thread after
	 * #command has been set.
	 */
	Cond cond;

	/**
	 * The player_control object which "owns" this output.  This
	 * object is needed to signal command completion.
	 */
	struct player_control *player_control;

	/**
	 * The #music_chunk which is currently being played.  All
	 * chunks before this one may be returned to the
	 * #music_buffer, because they are not going to be used by
	 * this output anymore.
	 */
	const struct music_chunk *chunk;

	/**
	 * Has the output finished playing #chunk?
	 */
	bool chunk_finished;
};

/**
 * Notify object used by the thread's client, i.e. we will send a
 * notify signal to this object, expecting the caller to wait on it.
 */
extern struct notify audio_output_client_notify;

static inline bool
audio_output_is_open(const struct audio_output *ao)
{
	return ao->open;
}

static inline bool
audio_output_command_is_finished(const struct audio_output *ao)
{
	return ao->command == AO_COMMAND_NONE;
}

struct audio_output *
audio_output_new(const config_param &param,
		 struct player_control *pc,
		 Error &error);

bool
ao_base_init(struct audio_output *ao,
	     const struct audio_output_plugin *plugin,
	     const config_param &param, Error &error);

void
ao_base_finish(struct audio_output *ao);

void
audio_output_free(struct audio_output *ao);

#endif