aboutsummaryrefslogtreecommitdiffstats
path: root/src/output/NullOutputPlugin.cxx
blob: 0ce32fbda7fd2605b8c42a633d83695b97424c48 (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
/*
 * 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 "NullOutputPlugin.hxx"
#include "OutputAPI.hxx"
#include "Timer.hxx"

#include <assert.h>

struct NullOutput {
	struct audio_output base;

	bool sync;

	Timer *timer;

	bool Initialize(const config_param &param, GError **error_r) {
		return ao_base_init(&base, &null_output_plugin, param,
				    error_r);
	}

	void Deinitialize() {
		ao_base_finish(&base);
	}
};

static struct audio_output *
null_init(const config_param &param, GError **error_r)
{
	NullOutput *nd = new NullOutput();

	if (!nd->Initialize(param, error_r)) {
		delete nd;
		return nullptr;
	}

	nd->sync = param.GetBlockValue("sync", true);

	return &nd->base;
}

static void
null_finish(struct audio_output *ao)
{
	NullOutput *nd = (NullOutput *)ao;

	nd->Deinitialize();
	delete nd;
}

static bool
null_open(struct audio_output *ao, AudioFormat &audio_format,
	  gcc_unused GError **error)
{
	NullOutput *nd = (NullOutput *)ao;

	if (nd->sync)
		nd->timer = new Timer(audio_format);

	return true;
}

static void
null_close(struct audio_output *ao)
{
	NullOutput *nd = (NullOutput *)ao;

	if (nd->sync)
		delete nd->timer;
}

static unsigned
null_delay(struct audio_output *ao)
{
	NullOutput *nd = (NullOutput *)ao;

	return nd->sync && nd->timer->IsStarted()
		? nd->timer->GetDelay()
		: 0;
}

static size_t
null_play(struct audio_output *ao, gcc_unused const void *chunk, size_t size,
	  gcc_unused GError **error)
{
	NullOutput *nd = (NullOutput *)ao;
	Timer *timer = nd->timer;

	if (!nd->sync)
		return size;

	if (!timer->IsStarted())
		timer->Start();
	timer->Add(size);

	return size;
}

static void
null_cancel(struct audio_output *ao)
{
	NullOutput *nd = (NullOutput *)ao;

	if (!nd->sync)
		return;

	nd->timer->Reset();
}

const struct audio_output_plugin null_output_plugin = {
	"null",
	nullptr,
	null_init,
	null_finish,
	nullptr,
	nullptr,
	null_open,
	null_close,
	null_delay,
	nullptr,
	null_play,
	nullptr,
	null_cancel,
	nullptr,
	nullptr,
};