comparison audioio/AudioPulseAudioTarget.h @ 117:2bc8bf6d016c

* Provisional PulseAudio output driver.  No latency handling yet, and
  some other things missing.  The very basic basics work.

+/* -*- 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 <QThread>
+
+#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 contextStateChangedStatic(pa_context *, void *);
+
+    QMutex m_mutex;
+
+    class MainLoopThread : public QThread
+    {
+    public:
+        MainLoopThread(pa_mainloop *loop) : m_loop(loop) { }
+        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
+