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/*
* Copyright 2003-2020 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 "NullOutputPlugin.hxx"
#include "../OutputAPI.hxx"
#include "../Timer.hxx"
class NullOutput final : AudioOutput {
const bool sync;
Timer *timer;
public:
explicit NullOutput(const ConfigBlock &block)
:AudioOutput(0),
sync(block.GetBlockValue("sync", true)) {}
static AudioOutput *Create(EventLoop &,
const ConfigBlock &block) {
return new NullOutput(block);
}
private:
void Open(AudioFormat &audio_format) override {
if (sync)
timer = new Timer(audio_format);
}
void Close() noexcept override {
if (sync)
delete timer;
}
std::chrono::steady_clock::duration Delay() const noexcept override {
return sync && timer->IsStarted()
? timer->GetDelay()
: std::chrono::steady_clock::duration::zero();
}
size_t Play(gcc_unused const void *chunk, size_t size) override {
if (sync) {
if (!timer->IsStarted())
timer->Start();
timer->Add(size);
}
return size;
}
void Cancel() noexcept override {
if (sync)
timer->Reset();
}
};
const struct AudioOutputPlugin null_output_plugin = {
"null",
nullptr,
&NullOutput::Create,
nullptr,
};
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