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/*
* 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 "SoftwareMixerPlugin.hxx"
#include "MixerInternal.hxx"
#include "FilterPlugin.hxx"
#include "FilterRegistry.hxx"
#include "FilterInternal.hxx"
#include "filter/VolumeFilterPlugin.hxx"
#include "pcm/PcmVolume.hxx"
#include "ConfigData.hxx"
#include "util/Error.hxx"
#include <assert.h>
#include <math.h>
static Filter *
CreateVolumeFilter()
{
Error error;
return filter_new(&volume_filter_plugin, config_param(), error);
}
struct SoftwareMixer final : public Mixer {
Filter *filter;
/**
* If this is true, then this object "owns" the #Filter
* instance (see above). It will be set to false by
* software_mixer_get_filter(); after that, the caller will be
* responsible for the #Filter.
*/
bool owns_filter;
unsigned volume;
SoftwareMixer()
:Mixer(software_mixer_plugin),
filter(CreateVolumeFilter()),
owns_filter(true),
volume(100)
{
assert(filter != nullptr);
}
~SoftwareMixer() {
if (owns_filter)
delete filter;
}
};
static Mixer *
software_mixer_init(gcc_unused void *ao,
gcc_unused const config_param ¶m,
gcc_unused Error &error)
{
return new SoftwareMixer();
}
static void
software_mixer_finish(Mixer *data)
{
SoftwareMixer *sm = (SoftwareMixer *)data;
delete sm;
}
static int
software_mixer_get_volume(Mixer *mixer, gcc_unused Error &error)
{
SoftwareMixer *sm = (SoftwareMixer *)mixer;
return sm->volume;
}
static bool
software_mixer_set_volume(Mixer *mixer, unsigned volume,
gcc_unused Error &error)
{
SoftwareMixer *sm = (SoftwareMixer *)mixer;
assert(volume <= 100);
sm->volume = volume;
if (volume >= 100)
volume = PCM_VOLUME_1;
else if (volume > 0)
volume = pcm_float_to_volume((exp(volume / 25.0) - 1) /
(54.5981500331F - 1));
volume_filter_set(sm->filter, volume);
return true;
}
const struct mixer_plugin software_mixer_plugin = {
software_mixer_init,
software_mixer_finish,
nullptr,
nullptr,
software_mixer_get_volume,
software_mixer_set_volume,
true,
};
Filter *
software_mixer_get_filter(Mixer *mixer)
{
SoftwareMixer *sm = (SoftwareMixer *)mixer;
assert(sm->IsPlugin(software_mixer_plugin));
assert(sm->owns_filter);
sm->owns_filter = false;
return sm->filter;
}
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