1 /* 2 * Copyright (C) 2023 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #include <map> 20 #include <memory> 21 #include <mutex> 22 #include <vector> 23 24 #include <android-base/thread_annotations.h> 25 #include <android/binder_auto_utils.h> 26 27 #include "alsa/Mixer.h" 28 29 namespace aidl::android::hardware::audio::core::usb { 30 31 class UsbAlsaMixerControl { 32 public: 33 static UsbAlsaMixerControl& getInstance(); 34 35 void setDeviceConnectionState(int card, bool masterMuted, float masterVolume, bool connected); 36 37 // Master volume settings will be applied to all sound cards, it is only set by the 38 // USB module. 39 ndk::ScopedAStatus setMasterMute(bool muted); 40 ndk::ScopedAStatus setMasterVolume(float volume); 41 // The volume settings can be different on sound cards. It is controlled by streams. 42 ndk::ScopedAStatus setVolumes(int card, const std::vector<float>& volumes); 43 44 private: 45 std::shared_ptr<alsa::Mixer> getAlsaMixer(int card); 46 std::map<int, std::shared_ptr<alsa::Mixer>> getAlsaMixers(); 47 48 std::mutex mLock; 49 // A map whose key is the card number and value is a shared pointer to corresponding 50 // AlsaMixer object. 51 std::map<int, std::shared_ptr<alsa::Mixer>> mMixerControls GUARDED_BY(mLock); 52 }; 53 54 } // namespace aidl::android::hardware::audio::core::usb 55