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/*************************************************************************
MultiTrackSource.h - template for multi-track sources
-------------------
begin : Sat Oct 20 2007
copyright : (C) 2007 by Thomas Eschenbacher
email : Thomas.Eschenbacher@gmx.de
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#ifndef MULTI_TRACK_SOURCE_H
#define MULTI_TRACK_SOURCE_H
#include "config.h"
#include "libkwave_export.h"
#include <new>
#include <QFutureSynchronizer>
#include <QList>
#include <QObject>
#include <QtConcurrentRun>
#include "libkwave/SampleSource.h"
namespace Kwave
{
/**
* Template for easier handling of Kwave::SampleSource objects
* that consist of multiple independent tracks.
*/
template <class SOURCE, const bool INITIALIZE>
class LIBKWAVE_EXPORT MultiTrackSource: public Kwave::SampleSource,
private QList<SOURCE *>
{
public:
/**
* Default constructor, which does no initialization of the
* objects themselves. If you want to use this, you should
* derive from this class, create all objects manually and
* "insert" them from the constructor.
*
* @param tracks number of tracks
* @param parent a parent object, passed to QObject
*/
MultiTrackSource(unsigned int tracks, QObject *parent)
:Kwave::SampleSource(parent),
QList<SOURCE *>()
{
Q_UNUSED(tracks)
Q_ASSERT(INITIALIZE || (tracks == 0));
Q_ASSERT(QList<SOURCE *>::size() == static_cast<int>(tracks));
}
/** Destructor */
~MultiTrackSource() override
{
clear();
}
/**
* Calls goOn() for each track.
* @see Kwave::SampleSource::goOn()
*/
void goOn() override
{
if (isCanceled()) return;
QFutureSynchronizer<void> synchronizer;
foreach (SOURCE *src, static_cast< QList<SOURCE *> >(*this)) {
if (!src) continue;
synchronizer.addFuture(QtConcurrent::run(
&Kwave::MultiTrackSource<SOURCE, INITIALIZE>::runSource,
this,
src)
);
}
synchronizer.waitForFinished();
}
/** Returns true when all sources are done */
bool done() const override
{
foreach (SOURCE *src, static_cast< QList<SOURCE *> >(*this))
if (src && !src->done()) return false;
return true;
}
/**
* Returns the number of tracks that the source provides
* @return number of tracks
*/
unsigned int tracks() const override
{
return static_cast<unsigned int>(QList<SOURCE *>::size());
}
/**
* Returns the source that corresponds to one specific track
* if the object has multiple tracks. For single-track objects
* it returns "this" for the first index and 0 for all others
*/
inline virtual SOURCE *at(unsigned int track) const {
return QList<SOURCE *>::at(track);
}
/** @see the Kwave::MultiTrackSource.at()... */
inline virtual SOURCE * operator [] (unsigned int track)
override
{
return at(track);
}
/**
* Insert a new track with a source.
*
* @param track index of the track [0...N-1]
* @param source pointer to a Kwave::SampleSource
* @return true if successful, false if failed
*/
inline virtual bool insert(unsigned int track, SOURCE *source) {
QList<SOURCE *>::insert(track, source);
QObject::connect(this, SIGNAL(sigCancel()),
source, SLOT(cancel()), Qt::DirectConnection);
return (at(track) == source);
}
/** Remove all tracks / sources */
inline virtual void clear() {
while (!QList<SOURCE *>::isEmpty())
delete QList<SOURCE *>::takeLast();
}
private:
/** little wrapper for calling goOn() of a source in a worker thread */
void runSource(SOURCE *src) {
src->goOn();
}
};
/**
* Specialized version that internally initializes all objects
* by generating them through their default constructor.
*/
template <class SOURCE>
class LIBKWAVE_EXPORT MultiTrackSource<SOURCE, true>
:public Kwave::MultiTrackSource<SOURCE, false>
{
public:
/**
* Constructor
*
* @param tracks number of tracks
* @param parent a parent object, passed to QObject (optional)
*/
MultiTrackSource(unsigned int tracks,
QObject *parent = nullptr)
:Kwave::MultiTrackSource<SOURCE, false>(0, parent)
{
for (unsigned int i = 0; i < tracks; i++)
this->insert(i, new(std::nothrow) SOURCE());
}
/** Destructor */
virtual ~MultiTrackSource() override { }
};
}
#endif /* MULTI_TRACK_SOURCE_H */
//***************************************************************************
//***************************************************************************
|
