107 lines
3.3 KiB
C
107 lines
3.3 KiB
C
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/*
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* Copyright (C) 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <map>
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#include <memory>
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#include <mutex>
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#include <optional>
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#include <string>
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#include <vector>
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#include <android-base/thread_annotations.h>
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#include <android/binder_auto_utils.h>
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extern "C" {
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#include <tinyalsa/mixer.h>
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}
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namespace aidl::android::hardware::audio::core::usb {
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class MixerControl {
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public:
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explicit MixerControl(struct mixer_ctl* ctl);
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unsigned int getNumValues() const;
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int getMaxValue() const;
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int getMinValue() const;
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int setArray(const void* array, size_t count);
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private:
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std::mutex mLock;
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// The mixer_ctl object is owned by ALSA and will be released when the mixer is closed.
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struct mixer_ctl* mCtl GUARDED_BY(mLock);
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const unsigned int mNumValues;
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const int mMinValue;
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const int mMaxValue;
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};
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class AlsaMixer {
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public:
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explicit AlsaMixer(struct mixer* mixer);
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~AlsaMixer();
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bool isValid() const { return mMixer != nullptr; }
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ndk::ScopedAStatus setMasterMute(bool muted);
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ndk::ScopedAStatus setMasterVolume(float volume);
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ndk::ScopedAStatus setVolumes(std::vector<float> volumes);
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private:
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enum Control {
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MASTER_SWITCH,
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MASTER_VOLUME,
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HW_VOLUME,
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};
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using ControlNamesAndExpectedCtlType = std::pair<std::string, enum mixer_ctl_type>;
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static const std::map<Control, std::vector<ControlNamesAndExpectedCtlType>> kPossibleControls;
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static std::map<Control, std::shared_ptr<MixerControl>> initializeMixerControls(
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struct mixer* mixer);
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// The mixer object is owned by ALSA and will be released when the mixer is closed.
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struct mixer* mMixer;
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// `mMixerControls` will only be initialized in constructor. After that, it wil only be
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// read but not be modified.
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const std::map<Control, std::shared_ptr<MixerControl>> mMixerControls;
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};
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class UsbAlsaMixerControl {
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public:
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static UsbAlsaMixerControl& getInstance();
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void setDeviceConnectionState(int card, bool masterMuted, float masterVolume, bool connected);
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// Master volume settings will be applied to all sound cards, it is only set by the
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// USB module.
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ndk::ScopedAStatus setMasterMute(bool muted);
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ndk::ScopedAStatus setMasterVolume(float volume);
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// The volume settings can be different on sound cards. It is controlled by streams.
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ndk::ScopedAStatus setVolumes(int card, std::vector<float> volumes);
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private:
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std::shared_ptr<AlsaMixer> getAlsaMixer(int card);
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std::map<int, std::shared_ptr<AlsaMixer>> getAlsaMixers();
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std::mutex mLock;
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// A map whose key is the card number and value is a shared pointer to corresponding
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// AlsaMixer object.
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std::map<int, std::shared_ptr<AlsaMixer>> mMixerControls GUARDED_BY(mLock);
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};
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} // namespace aidl::android::hardware::audio::core::usb
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