CoreAudioDevice.h

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/*******************************************************************************
 * Copyright 2009-2021 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
 
#ifdef COREAUDIO_PLUGIN
#define AUD_BUILD_PLUGIN
#endif

 
#include <memory>
 
#include <AudioToolbox/AudioToolbox.h>
#include <AudioToolbox/CoreAudioClock.h>
#include <AudioUnit/AudioUnit.h>
 
#include "devices/MixingThreadDevice.h"
 
AUD_NAMESPACE_BEGIN

class AUD_PLUGIN_API CoreAudioDevice : public MixingThreadDevice
{
private:
    uint32_t m_buffersize;

    bool m_playback;

    AudioUnit m_audio_unit;
    bool m_active{false};

    CAClockRef m_clock_ref;
    bool m_audio_clock_ready{false};
    double m_synchronizerStartTime{0};

    AUD_LOCAL static OSStatus CoreAudio_mix(void* data, AudioUnitRenderActionFlags* flags, const AudioTimeStamp* time_stamp, UInt32 bus_number, UInt32 number_frames, AudioBufferList* buffer_list);
 
    // delete copy constructor and operator=
    CoreAudioDevice(const CoreAudioDevice&) = delete;
    CoreAudioDevice& operator=(const CoreAudioDevice&) = delete;
 
    AUD_LOCAL void preMixingWork(bool playing) override;
    void playing(bool playing) override;
 
public:
    CoreAudioDevice(DeviceSpecs specs, int buffersize = AUD_DEFAULT_BUFFER_SIZE);

    virtual ~CoreAudioDevice();
 
    virtual void seekSynchronizer(double time);
    virtual double getSynchronizerPosition();
    virtual void playSynchronizer();
    virtual void stopSynchronizer();

    static void registerPlugin();
};
 
AUD_NAMESPACE_END