view audioio/AudioPulseAudioTarget.h @ 154:386b02c926bf

* Merge from one-fftdataserver-per-fftmodel branch.  This bit of
reworking (which is not described very accurately by the title of
the branch) turns the MatrixFile object into something that either
reads or writes, but not both, and separates the FFT file cache
reader and writer implementations separately.  This allows the
FFT data server to have a single thread owning writers and one reader
per "customer" thread, and for all locking to be vastly simplified
and concentrated in the data server alone (because none of the
classes it makes use of is used in more than one thread at a time).
The result is faster and more trustworthy code.

/* -*- 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