102 lines
2.3 KiB
C++
102 lines
2.3 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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// Copyright The Music Player Daemon Project
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#include "AndroidMixerPlugin.hxx"
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#include "mixer/Mixer.hxx"
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#include "filter/plugins/VolumeFilterPlugin.hxx"
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#include "pcm/Volume.hxx"
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#include "android/Context.hxx"
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#include "android/AudioManager.hxx"
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#include "Main.hxx"
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#include <cassert>
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#include <cmath>
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class AndroidMixer final : public Mixer {
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AudioManager *audioManager;
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int currentVolume;
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int maxAndroidVolume;
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int lastAndroidVolume;
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public:
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explicit AndroidMixer(MixerListener &_listener);
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~AndroidMixer() override;
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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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void SetVolume(unsigned volume) override;
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};
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static Mixer *
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android_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 AndroidMixer(listener);
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}
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AndroidMixer::AndroidMixer(MixerListener &_listener)
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:Mixer(android_mixer_plugin, _listener)
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{
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JNIEnv *env = Java::GetEnv();
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audioManager = context->GetAudioManager(env);
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maxAndroidVolume = audioManager->GetMaxVolume();
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if (maxAndroidVolume != 0)
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{
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lastAndroidVolume = audioManager->GetVolume(env);
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currentVolume = 100 * lastAndroidVolume / maxAndroidVolume;
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}
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}
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AndroidMixer::~AndroidMixer()
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{
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delete audioManager;
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}
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int
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AndroidMixer::GetVolume()
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{
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JNIEnv *env = Java::GetEnv();
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if (maxAndroidVolume == 0)
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return -1;
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// The android volume index (or scale) is very likely inferior to the
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// MPD one (100). The last volume set by MPD is saved into
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// currentVolume, this volume is returned instead of the Android one
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// when the Android mixer was not touched by an other application. This
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// allows to fake a 0..100 scale from MPD.
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int volume = audioManager->GetVolume(env);
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if (volume == lastAndroidVolume)
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return currentVolume;
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return 100 * volume / maxAndroidVolume;
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}
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void
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AndroidMixer::SetVolume(unsigned newVolume)
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{
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JNIEnv *env = Java::GetEnv();
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if (maxAndroidVolume == 0)
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return;
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currentVolume = newVolume;
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lastAndroidVolume = currentVolume * maxAndroidVolume / 100;
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audioManager->SetVolume(env, lastAndroidVolume);
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}
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const MixerPlugin android_mixer_plugin = {
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android_mixer_init,
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true,
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};
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