115 lines
2.5 KiB
C++
115 lines
2.5 KiB
C++
/*
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* Copyright 2003-2021 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "SoftwareMixerPlugin.hxx"
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#include "mixer/MixerInternal.hxx"
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#include "filter/plugins/VolumeFilterPlugin.hxx"
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#include "pcm/Volume.hxx"
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#include <cassert>
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#include <cmath>
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class SoftwareMixer final : public Mixer {
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Filter *filter = nullptr;
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/**
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* The current volume in percent (0..100).
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*/
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unsigned volume = 100;
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public:
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explicit SoftwareMixer(MixerListener &_listener)
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:Mixer(software_mixer_plugin, _listener)
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{
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}
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void SetFilter(Filter *_filter) noexcept;
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/* virtual methods from class Mixer */
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void Open() override {
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}
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void Close() noexcept override {
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}
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int GetVolume() override {
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return volume;
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}
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void SetVolume(unsigned volume) override;
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};
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static Mixer *
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software_mixer_init([[maybe_unused]] EventLoop &event_loop,
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[[maybe_unused]] AudioOutput &ao,
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MixerListener &listener,
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[[maybe_unused]] const ConfigBlock &block)
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{
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return new SoftwareMixer(listener);
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}
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gcc_const
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static unsigned
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PercentVolumeToSoftwareVolume(unsigned volume) noexcept
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{
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assert(volume <= 100);
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if (volume == 100)
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return PCM_VOLUME_1;
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if (volume > 0)
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return pcm_float_to_volume((std::exp(volume / 25.0f) - 1) /
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(54.5981500331F - 1));
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return 0;
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}
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void
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SoftwareMixer::SetVolume(unsigned new_volume)
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{
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assert(new_volume <= 100);
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volume = new_volume;
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if (filter != nullptr)
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volume_filter_set(filter, PercentVolumeToSoftwareVolume(new_volume));
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}
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const MixerPlugin software_mixer_plugin = {
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software_mixer_init,
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true,
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};
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inline void
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SoftwareMixer::SetFilter(Filter *_filter) noexcept
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{
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filter = _filter;
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if (filter != nullptr)
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volume_filter_set(filter,
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PercentVolumeToSoftwareVolume(volume));
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}
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void
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software_mixer_set_filter(Mixer &mixer, Filter *filter) noexcept
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{
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auto &sm = (SoftwareMixer &)mixer;
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sm.SetFilter(filter);
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}
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