123 lines
2.8 KiB
C++
123 lines
2.8 KiB
C++
/*
|
|
* Copyright 2003-2016 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 "SoftwareMixerPlugin.hxx"
|
|
#include "mixer/MixerInternal.hxx"
|
|
#include "filter/FilterPlugin.hxx"
|
|
#include "filter/FilterRegistry.hxx"
|
|
#include "filter/FilterInternal.hxx"
|
|
#include "filter/plugins/VolumeFilterPlugin.hxx"
|
|
#include "pcm/Volume.hxx"
|
|
#include "config/Block.hxx"
|
|
#include "util/Error.hxx"
|
|
|
|
#include <assert.h>
|
|
#include <math.h>
|
|
|
|
class SoftwareMixer final : public Mixer {
|
|
Filter *filter = nullptr;
|
|
|
|
/**
|
|
* The current volume in percent (0..100).
|
|
*/
|
|
unsigned volume = 100;
|
|
|
|
public:
|
|
SoftwareMixer(MixerListener &_listener)
|
|
:Mixer(software_mixer_plugin, _listener)
|
|
{
|
|
}
|
|
|
|
void SetFilter(Filter *_filter);
|
|
|
|
/* virtual methods from class Mixer */
|
|
virtual bool Open(gcc_unused Error &error) override {
|
|
return true;
|
|
}
|
|
|
|
virtual void Close() override {
|
|
}
|
|
|
|
virtual int GetVolume(gcc_unused Error &error) override {
|
|
return volume;
|
|
}
|
|
|
|
virtual bool SetVolume(unsigned volume, Error &error) override;
|
|
};
|
|
|
|
static Mixer *
|
|
software_mixer_init(gcc_unused EventLoop &event_loop,
|
|
gcc_unused AudioOutput &ao,
|
|
MixerListener &listener,
|
|
gcc_unused const ConfigBlock &block,
|
|
gcc_unused Error &error)
|
|
{
|
|
return new SoftwareMixer(listener);
|
|
}
|
|
|
|
gcc_const
|
|
static unsigned
|
|
PercentVolumeToSoftwareVolume(unsigned volume)
|
|
{
|
|
assert(volume <= 100);
|
|
|
|
if (volume >= 100)
|
|
return PCM_VOLUME_1;
|
|
else if (volume > 0)
|
|
return pcm_float_to_volume((exp(volume / 25.0) - 1) /
|
|
(54.5981500331F - 1));
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
bool
|
|
SoftwareMixer::SetVolume(unsigned new_volume, gcc_unused Error &error)
|
|
{
|
|
assert(new_volume <= 100);
|
|
|
|
volume = new_volume;
|
|
|
|
if (filter != nullptr)
|
|
volume_filter_set(filter, PercentVolumeToSoftwareVolume(new_volume));
|
|
return true;
|
|
}
|
|
|
|
const MixerPlugin software_mixer_plugin = {
|
|
software_mixer_init,
|
|
true,
|
|
};
|
|
|
|
inline void
|
|
SoftwareMixer::SetFilter(Filter *_filter)
|
|
{
|
|
filter = _filter;
|
|
|
|
if (filter != nullptr)
|
|
volume_filter_set(filter,
|
|
PercentVolumeToSoftwareVolume(volume));
|
|
}
|
|
|
|
void
|
|
software_mixer_set_filter(Mixer &mixer, Filter *filter)
|
|
{
|
|
SoftwareMixer &sm = (SoftwareMixer &)mixer;
|
|
sm.SetFilter(filter);
|
|
}
|