PulseAudioDevice.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
 
#ifdef PULSEAUDIO_PLUGIN
#define AUD_BUILD_PLUGIN
#endif

 
#include "devices/SoftwareDevice.h"
#include "util/RingBuffer.h"
 
#include <condition_variable>
#include <thread>
 
#include <pulse/pulseaudio.h>
 
AUD_NAMESPACE_BEGIN

class AUD_PLUGIN_API PulseAudioDevice : public SoftwareDevice
{
private:
    class PulseAudioSynchronizer : public DefaultSynchronizer
    {
        PulseAudioDevice* m_device;
        bool m_playing = false;
        pa_usec_t m_time_start = 0;
        double m_seek_pos = 0.0f;
 
    public:
        PulseAudioSynchronizer(PulseAudioDevice* device);
 
        virtual void play();
        virtual void stop();
        virtual void seek(std::shared_ptr<IHandle> handle, double time);
        virtual double getPosition(std::shared_ptr<IHandle> handle);
    };

    PulseAudioSynchronizer m_synchronizer;

    volatile bool m_playback;
 
    bool m_corked;
 
    pa_threaded_mainloop* m_mainloop;
    pa_context* m_context;
    pa_stream* m_stream;
    pa_context_state_t m_state;

    RingBuffer m_ring_buffer;

    bool m_valid;
 
    int m_buffersize;
    uint32_t m_underflows;

    std::thread m_mixingThread;

    std::mutex m_mixingLock;

    std::condition_variable m_mixingCondition;

    AUD_LOCAL void updateRingBuffer();

    AUD_LOCAL static void PulseAudio_state_callback(pa_context* context, void* data);

    AUD_LOCAL static void PulseAudio_request(pa_stream* stream, size_t total_bytes, void* data);
 
    // delete copy constructor and operator=
    PulseAudioDevice(const PulseAudioDevice&) = delete;
    PulseAudioDevice& operator=(const PulseAudioDevice&) = delete;
 
protected:
    virtual void playing(bool playing);
 
public:
    PulseAudioDevice(const std::string &name, DeviceSpecs specs, int buffersize = AUD_DEFAULT_BUFFER_SIZE);

    virtual ~PulseAudioDevice();
 
    virtual ISynchronizer* getSynchronizer();

    static void registerPlugin();
};
 
AUD_NAMESPACE_END