view audioio/AudioPulseAudioTarget.h @ 141:9a8c73ffdce0

* Make it possible to import an entire session from an RDF document.
  However, at the moment the timings of events appear to be constrained
  by how far the audio decoder has got through its audio file at the
  time the event is queried -- need to investigate.

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2008 QMUL.
    
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#ifndef _AUDIO_PULSE_AUDIO_TARGET_H_
#define _AUDIO_PULSE_AUDIO_TARGET_H_

#ifdef HAVE_LIBPULSE

#include <pulse/pulseaudio.h>

#include <QObject>
#include <QMutex>
#include "base/Thread.h"

#include "AudioCallbackPlayTarget.h"

class AudioCallbackPlaySource;

class AudioPulseAudioTarget : public AudioCallbackPlayTarget
{
    Q_OBJECT

public:
    AudioPulseAudioTarget(AudioCallbackPlaySource *source);
    virtual ~AudioPulseAudioTarget();

    virtual void shutdown();

    virtual bool isOK() const;

    virtual double getCurrentTime() const;

public slots:
    virtual void sourceModelReplaced();

protected:
    void streamWrite(size_t);
    void streamStateChanged();
    void contextStateChanged();

    static void streamWriteStatic(pa_stream *, size_t, void *);
    static void streamStateChangedStatic(pa_stream *, void *);
    static void streamOverflowStatic(pa_stream *, void *);
    static void streamUnderflowStatic(pa_stream *, void *);
    static void contextStateChangedStatic(pa_context *, void *);

    QMutex m_mutex;

    class MainLoopThread : public Thread
    {
    public:
        MainLoopThread(pa_mainloop *loop) : Thread(NonRTThread), m_loop(loop) { } //!!! or RTThread
        virtual void run() {
            int rv = 0;
            pa_mainloop_run(m_loop, &rv); //!!! check return value from this, and rv
        }

    private:
        pa_mainloop *m_loop;
    };

    pa_mainloop *m_loop;
    pa_mainloop_api *m_api;
    pa_context *m_context;
    pa_stream *m_stream;
    pa_sample_spec m_spec;

    MainLoopThread *m_loopThread;

    int m_bufferSize;
    int m_sampleRate;
    int m_latency;
    bool m_done;
};

#endif /* HAVE_PULSEAUDIO */

#endif