1 // Copyright 2016 The Android Open Source Project 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 // 15 16 // Main loop of the brillo audio service. 17 18 #ifndef BRILLO_AUDIO_AUDIOSERVICE_AUDIO_DAEMON_H_ 19 #define BRILLO_AUDIO_AUDIOSERVICE_AUDIO_DAEMON_H_ 20 21 #include <memory> 22 #include <stack> 23 24 #include <base/files/file.h> 25 #include <base/memory/weak_ptr.h> 26 #include <brillo/binder_watcher.h> 27 #include <brillo/daemons/daemon.h> 28 #include <media/IAudioPolicyService.h> 29 30 #include "audio_device_handler.h" 31 32 namespace brillo { 33 34 class AudioDaemon : public Daemon { 35 public: 36 AudioDaemon() {} 37 38 protected: 39 // Initialize the audio device handler and start pollig the files in 40 // /dev/input. 41 int OnInit() override; 42 43 private: 44 // Callback function for input events. Events are handled by the audio device 45 // handler. 46 void Callback(base::File* file); 47 48 // Callback function for audio policy service death notification. 49 void OnAPSDisconnected(); 50 51 // Connect to the audio policy service and register a callback to be invoked 52 // if the audio policy service dies. 53 void ConnectToAPS(); 54 55 // Initialize the audio_device_handler_. 56 // 57 // Note: This can only occur after we have connected to the audio policy 58 // service. 59 void InitializeHandler(); 60 61 // Store the file objects that are created during initialization for the files 62 // being polled. This is done so these objects can be freed when the 63 // AudioDaemon object is destroyed. 64 std::stack<base::File> files_; 65 // Handler for audio device input events. 66 std::unique_ptr<AudioDeviceHandler> audio_device_handler_; 67 // Used to generate weak_ptr to AudioDaemon for use in base::Bind. 68 base::WeakPtrFactory<AudioDaemon> weak_ptr_factory_{this}; 69 // Pointer to the audio policy service. 70 android::sp<android::IAudioPolicyService> aps_; 71 // Flag to indicate whether the handler has been initialized. 72 bool handler_initialized_ = false; 73 // Binder watcher to watch for binder messages. 74 brillo::BinderWatcher binder_watcher_; 75 }; 76 77 } // namespace brillo 78 79 #endif // BRILLO_AUDIO_AUDIOSERVICE_AUDIO_DAEMON_H_ 80
