xref: /frameworks/av/media/libaaudio/src/binding/AAudioBinderClient.h

/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef ANDROID_AAUDIO_AAUDIO_BINDER_CLIENT_H
#define ANDROID_AAUDIO_AAUDIO_BINDER_CLIENT_H

#include <utils/Singleton.h>

#include <aaudio/AAudio.h>
#include "AAudioServiceDefinitions.h"
#include "AAudioServiceInterface.h"
#include "binding/AAudioStreamRequest.h"
#include "binding/AAudioStreamConfiguration.h"
#include "binding/AudioEndpointParcelable.h"

/**
 * Implements the AAudioServiceInterface by talking to the actual service through Binder.
 */

namespace aaudio {

class AAudioBinderClient : public AAudioServiceInterface
        , public android::Singleton<AAudioBinderClient> {

public:

    AAudioBinderClient();

    virtual ~AAudioBinderClient();

    /**
     * @param request info needed to create the stream
     * @param configuration contains resulting information about the created stream
     * @return handle to the stream or a negative error
     */
    aaudio_handle_t openStream(const AAudioStreamRequest &request,
                               AAudioStreamConfiguration &configurationOutput) override;

    aaudio_result_t closeStream(aaudio_handle_t streamHandle) override;

    /* Get an immutable description of the in-memory queues
    * used to communicate with the underlying HAL or Service.
    */
    aaudio_result_t getStreamDescription(aaudio_handle_t streamHandle,
                                                 AudioEndpointParcelable &parcelable) override;

    /**
     * Start the flow of data.
     * This is asynchronous. When complete, the service will send a STARTED event.
     */
    aaudio_result_t startStream(aaudio_handle_t streamHandle) override;

    /**
     * Stop the flow of data such that start() can resume without loss of data.
     * This is asynchronous. When complete, the service will send a PAUSED event.
     */
    aaudio_result_t pauseStream(aaudio_handle_t streamHandle) override;

    aaudio_result_t stopStream(aaudio_handle_t streamHandle) override;

    /**
     *  Discard any data held by the underlying HAL or Service.
     * This is asynchronous. When complete, the service will send a FLUSHED event.
     */
    aaudio_result_t flushStream(aaudio_handle_t streamHandle) override;

    /**
     * Manage the specified thread as a low latency audio thread.
     * TODO Consider passing this information as part of the startStream() call.
     */
    aaudio_result_t registerAudioThread(aaudio_handle_t streamHandle,
                                                pid_t clientProcessId,
                                                pid_t clientThreadId,
                                                int64_t periodNanoseconds) override;

    aaudio_result_t unregisterAudioThread(aaudio_handle_t streamHandle,
                                                  pid_t clientProcessId,
                                                  pid_t clientThreadId) override;
};


} /* namespace aaudio */

#endif //ANDROID_AAUDIO_AAUDIO_BINDER_CLIENT_H