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/*
* Copyright 2003-2018 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 "VolumeFilterPlugin.hxx"
#include "filter/Filter.hxx"
#include "filter/Prepared.hxx"
#include "pcm/Volume.hxx"
#include "AudioFormat.hxx"
#include "util/ConstBuffer.hxx"
#include <stdexcept>
class VolumeFilter final : public Filter {
PcmVolume pv;
public:
explicit VolumeFilter(const AudioFormat &audio_format)
:Filter(audio_format) {
pv.Open(out_audio_format.format);
}
unsigned GetVolume() const noexcept {
return pv.GetVolume();
}
void SetVolume(unsigned _volume) noexcept {
pv.SetVolume(_volume);
}
/* virtual methods from class Filter */
ConstBuffer<void> FilterPCM(ConstBuffer<void> src) override;
};
class PreparedVolumeFilter final : public PreparedFilter {
public:
/* virtual methods from class Filter */
std::unique_ptr<Filter> Open(AudioFormat &af) override;
};
std::unique_ptr<Filter>
PreparedVolumeFilter::Open(AudioFormat &audio_format)
{
return std::make_unique<VolumeFilter>(audio_format);
}
ConstBuffer<void>
VolumeFilter::FilterPCM(ConstBuffer<void> src)
{
return pv.Apply(src);
}
std::unique_ptr<PreparedFilter>
volume_filter_prepare() noexcept
{
return std::make_unique<PreparedVolumeFilter>();
}
unsigned
volume_filter_get(const Filter *_filter) noexcept
{
const VolumeFilter *filter =
(const VolumeFilter *)_filter;
return filter->GetVolume();
}
void
volume_filter_set(Filter *_filter, unsigned volume) noexcept
{
VolumeFilter *filter = (VolumeFilter *)_filter;
filter->SetVolume(volume);
}