aboutsummaryrefslogtreecommitdiffstats
path: root/src/OutputAll.hxx
blob: 6f3ea4039e88538f49c42439bf6f6b750f6ec313 (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
/*
 * Copyright (C) 2003-2011 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.
 */

/*
 * Functions for dealing with all configured (enabled) audion outputs
 * at once.
 *
 */

#ifndef OUTPUT_ALL_H
#define OUTPUT_ALL_H

#include "ReplayGainInfo.hxx"
#include "Compiler.h"

struct AudioFormat;
class MusicBuffer;
struct music_chunk;
struct PlayerControl;
class Error;

/**
 * Global initialization: load audio outputs from the configuration
 * file and initialize them.
 */
void
audio_output_all_init(PlayerControl &pc);

/**
 * Global finalization: free memory occupied by audio outputs.  All
 */
void
audio_output_all_finish(void);

/**
 * Returns the total number of audio output devices, including those
 * who are disabled right now.
 */
gcc_const
unsigned int audio_output_count(void);

/**
 * Returns the "i"th audio output device.
 */
gcc_const
struct audio_output *
audio_output_get(unsigned i);

/**
 * Returns the audio output device with the specified name.  Returns
 * NULL if the name does not exist.
 */
gcc_pure
struct audio_output *
audio_output_find(const char *name);

/**
 * Checks the "enabled" flag of all audio outputs, and if one has
 * changed, commit the change.
 */
void
audio_output_all_enable_disable(void);

/**
 * Opens all audio outputs which are not disabled.
 *
 * @param audio_format the preferred audio format
 * @param buffer the #music_buffer where consumed #music_chunk objects
 * should be returned
 * @return true on success, false on failure
 */
bool
audio_output_all_open(AudioFormat audio_format,
		      MusicBuffer &buffer,
		      Error &error);

/**
 * Closes all audio outputs.
 */
void
audio_output_all_close(void);

/**
 * Closes all audio outputs.  Outputs with the "always_on" flag are
 * put into pause mode.
 */
void
audio_output_all_release(void);

void
audio_output_all_set_replay_gain_mode(ReplayGainMode mode);

/**
 * Enqueue a #music_chunk object for playing, i.e. pushes it to a
 * #MusicPipe.
 *
 * @param chunk the #music_chunk object to be played
 * @return true on success, false if no audio output was able to play
 * (all closed then)
 */
bool
audio_output_all_play(struct music_chunk *chunk, Error &error);

/**
 * Checks if the output devices have drained their music pipe, and
 * returns the consumed music chunks to the #music_buffer.
 *
 * @return the number of chunks to play left in the #MusicPipe
 */
unsigned
audio_output_all_check(void);

/**
 * Checks if the size of the #MusicPipe is below the #threshold.  If
 * not, it attempts to synchronize with all output threads, and waits
 * until another #music_chunk is finished.
 *
 * @param threshold the maximum number of chunks in the pipe
 * @return true if there are less than #threshold chunks in the pipe
 */
bool
audio_output_all_wait(PlayerControl &pc, unsigned threshold);

/**
 * Puts all audio outputs into pause mode.  Most implementations will
 * simply close it then.
 */
void
audio_output_all_pause(void);

/**
 * Drain all audio outputs.
 */
void
audio_output_all_drain(void);

/**
 * Try to cancel data which may still be in the device's buffers.
 */
void
audio_output_all_cancel(void);

/**
 * Indicate that a new song will begin now.
 */
void
audio_output_all_song_border(void);

/**
 * Returns the "elapsed_time" stamp of the most recently finished
 * chunk.  A negative value is returned when no chunk has been
 * finished yet.
 */
gcc_pure
float
audio_output_all_get_elapsed_time(void);

#endif