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      1 /*
      2  * Copyright (C) 2017 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 #ifndef ANDROID_AAUDIO_AAUDIO_BINDER_CLIENT_H
     18 #define ANDROID_AAUDIO_AAUDIO_BINDER_CLIENT_H
     19 
     20 #include <utils/RefBase.h>
     21 #include <utils/Singleton.h>
     22 
     23 #include <aaudio/AAudio.h>
     24 #include "AAudioServiceDefinitions.h"
     25 #include "AAudioServiceInterface.h"
     26 #include "binding/AAudioStreamRequest.h"
     27 #include "binding/AAudioStreamConfiguration.h"
     28 #include "binding/AudioEndpointParcelable.h"
     29 #include "binding/IAAudioService.h"
     30 
     31 /**
     32  * Implements the AAudioServiceInterface by talking to the service through Binder.
     33  */
     34 
     35 namespace aaudio {
     36 
     37 class AAudioBinderClient : public virtual android::RefBase
     38         , public AAudioServiceInterface
     39         , public android::Singleton<AAudioBinderClient> {
     40 
     41 public:
     42 
     43     AAudioBinderClient();
     44 
     45     virtual ~AAudioBinderClient();
     46 
     47     const android::sp<android::IAAudioService> getAAudioService();
     48 
     49     void dropAAudioService();
     50 
     51     void registerClient(const android::sp<android::IAAudioClient>& client __unused) override {}
     52 
     53     /**
     54      * @param request info needed to create the stream
     55      * @param configuration contains resulting information about the created stream
     56      * @return handle to the stream or a negative error
     57      */
     58     aaudio_handle_t openStream(const AAudioStreamRequest &request,
     59                                AAudioStreamConfiguration &configurationOutput) override;
     60 
     61     aaudio_result_t closeStream(aaudio_handle_t streamHandle) override;
     62 
     63     /* Get an immutable description of the in-memory queues
     64     * used to communicate with the underlying HAL or Service.
     65     */
     66     aaudio_result_t getStreamDescription(aaudio_handle_t streamHandle,
     67                                                  AudioEndpointParcelable &parcelable) override;
     68 
     69     /**
     70      * Start the flow of data.
     71      * This is asynchronous. When complete, the service will send a STARTED event.
     72      */
     73     aaudio_result_t startStream(aaudio_handle_t streamHandle) override;
     74 
     75     /**
     76      * Stop the flow of data such that start() can resume without loss of data.
     77      * This is asynchronous. When complete, the service will send a PAUSED event.
     78      */
     79     aaudio_result_t pauseStream(aaudio_handle_t streamHandle) override;
     80 
     81     aaudio_result_t stopStream(aaudio_handle_t streamHandle) override;
     82 
     83     /**
     84      *  Discard any data held by the underlying HAL or Service.
     85      * This is asynchronous. When complete, the service will send a FLUSHED event.
     86      */
     87     aaudio_result_t flushStream(aaudio_handle_t streamHandle) override;
     88 
     89     /**
     90      * Manage the specified thread as a low latency audio thread.
     91      * TODO Consider passing this information as part of the startStream() call.
     92      */
     93     aaudio_result_t registerAudioThread(aaudio_handle_t streamHandle,
     94                                                 pid_t clientThreadId,
     95                                                 int64_t periodNanoseconds) override;
     96 
     97     aaudio_result_t unregisterAudioThread(aaudio_handle_t streamHandle,
     98                                                   pid_t clientThreadId) override;
     99 
    100     aaudio_result_t startClient(aaudio_handle_t streamHandle __unused,
    101                                       const android::AudioClient& client __unused,
    102                                       audio_port_handle_t *clientHandle) override {
    103         return AAUDIO_ERROR_UNAVAILABLE;
    104     }
    105 
    106     aaudio_result_t stopClient(aaudio_handle_t streamHandle __unused,
    107                                audio_port_handle_t clientHandle __unused)  override {
    108         return AAUDIO_ERROR_UNAVAILABLE;
    109     }
    110 
    111     void onStreamChange(aaudio_handle_t handle, int32_t opcode, int32_t value) {
    112         // TODO This is just a stub so we can have a client Binder to pass to the service.
    113         // TODO Implemented in a later CL.
    114         ALOGW("onStreamChange called!");
    115     }
    116 
    117     class AAudioClient : public android::IBinder::DeathRecipient , public android::BnAAudioClient
    118     {
    119     public:
    120         AAudioClient(android::wp<AAudioBinderClient> aaudioBinderClient)
    121                 : mBinderClient(aaudioBinderClient) {
    122         }
    123 
    124         // implement DeathRecipient
    125         virtual void binderDied(const android::wp<android::IBinder>& who __unused) {
    126             android::sp<AAudioBinderClient> client = mBinderClient.promote();
    127             if (client.get() != nullptr) {
    128                 client->dropAAudioService();
    129             }
    130             ALOGW("AAudio service binderDied()!");
    131         }
    132 
    133         // implement BnAAudioClient
    134         void onStreamChange(aaudio_handle_t handle, int32_t opcode, int32_t value) {
    135             android::sp<AAudioBinderClient> client = mBinderClient.promote();
    136             if (client.get() != nullptr) {
    137                 client->onStreamChange(handle, opcode, value);
    138             }
    139         }
    140     private:
    141         android::wp<AAudioBinderClient> mBinderClient;
    142     };
    143 
    144 private:
    145 
    146     android::Mutex                  mServiceLock;
    147     android::sp<android::IAAudioService>  mAAudioService;
    148     android::sp<AAudioClient>       mAAudioClient;
    149 
    150 };
    151 
    152 
    153 } /* namespace aaudio */
    154 
    155 #endif //ANDROID_AAUDIO_AAUDIO_BINDER_CLIENT_H
    156