MixingThreadDevice.h

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/*******************************************************************************
 * Copyright 2009-2016 Jörg Müller
 *
 * 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.
 ******************************************************************************/

#pragma once

#include <condition_variable>
#include <thread>

#include "devices/SoftwareDevice.h"
#include "util/RingBuffer.h"

AUD_NAMESPACE_BEGIN

class AUD_PLUGIN_API MixingThreadDevice : public SoftwareDevice
{
private:
    volatile bool m_playback{false};

    Buffer m_mixingBuffer;

    RingBuffer m_ringBuffer;

    bool m_valid{false};

    std::thread m_mixingThread;

    std::mutex m_mixingLock;

    std::condition_variable m_mixingCondition;

    AUD_LOCAL void updateRingBuffer();

    // delete copy constructor and operator=
    MixingThreadDevice(const MixingThreadDevice&) = delete;
    MixingThreadDevice& operator=(const MixingThreadDevice&) = delete;

protected:
    void startMixingThread(size_t buffersize);

    void notifyMixingThread();

    inline RingBuffer& getRingBuffer()
    {
        return m_ringBuffer;
    }

    inline bool isMixingThreadRunning()
    {
        return m_valid;
    }

    virtual void playing(bool playing);

    virtual void preMixingWork(bool playing);

    MixingThreadDevice();

    void stopMixingThread();
};

AUD_NAMESPACE_END