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/*************************************************************************
MultiTrackSink.h - template for multi-track sinks
-------------------
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_SINK_H
#define MULTI_TRACK_SINK_H
#include "config.h"
#include <new>
#include <QList>
#include <QObject>
#include "libkwave/SampleSink.h"
namespace Kwave
{
template <class SINK, const bool INITIALIZE>
class MultiTrackSink: public Kwave::SampleSink,
private QList<SINK *>
{
public:
/**
* Constructor
* @param tracks number of tracks
* @param parent a parent object, passed to QObject (optional)
*/
MultiTrackSink(unsigned int tracks, QObject *parent = nullptr)
:Kwave::SampleSink(parent),
QList<SINK *>()
{
Q_UNUSED(tracks)
Q_ASSERT(INITIALIZE || (tracks == 0));
Q_ASSERT(QList<SINK *>::size() == static_cast<int>(tracks));
}
/** Destructor */
~MultiTrackSink() override
{
clear();
}
/** Returns true when all sinks are done */
bool done() const override
{
foreach (Kwave::SampleSink *s,
static_cast< QList<SINK *> >(*this))
if (s && !s->done()) return false;
return true;
}
/**
* Returns the number of tracks that the sink provides
* @return number of tracks
*/
unsigned int tracks() const override
{
return static_cast<unsigned int>(QList<SINK *>::size());
}
/**
* Returns the sink 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 SINK *at(unsigned int track) const {
return QList<SINK *>::at(track);
}
/** @see the Kwave::MultiTrackSink.at()... */
inline virtual SINK * operator [] (unsigned int track) override {
return at(track);
}
/**
* Insert a new track with a sink.
*
* @param track index of the track [0...N-1]
* @param sink pointer to a Kwave::SampleSink
* @return true if successful, false if failed
*/
virtual bool insert(unsigned int track, SINK *sink) {
QList<SINK *>::insert(track, sink);
QObject::connect(this, SIGNAL(sigCancel()),
sink, SLOT(cancel()), Qt::DirectConnection);
return (at(track) == sink);
}
/** Remove all tracks / sinks */
virtual void clear() {
while (!QList<SINK *>::isEmpty())
delete QList<SINK *>::takeLast();
}
/**
* overloaded function, in most cases the sink objects are connected
* to some sigCancel() signals of other stream objects, so that the
* cancel() slot of this object is not called.
*/
bool isCanceled() const override
{
if (Kwave::SampleSink::isCanceled())
return true;
unsigned int tracks = this->tracks();
for (unsigned int track = 0; track < tracks; track++) {
const SINK *sink = at(track);
if (sink && sink->isCanceled())
return true;
}
return false;
}
};
/**
* Specialized version that internally initializes all objects
* by generating them through their default constructor.
*/
template <class SINK>
class MultiTrackSink<SINK, true>
:public Kwave::MultiTrackSink<SINK, false>
{
public:
/**
* Constructor
*
* @param tracks number of tracks
* @param parent a parent object, passed to QObject (optional)
*/
MultiTrackSink(unsigned int tracks, QObject *parent = nullptr)
:Kwave::MultiTrackSink<SINK, false>(0, parent)
{
for (unsigned int i = 0; i < tracks; i++)
this->insert(i, new(std::nothrow) SINK());
}
/** Destructor */
virtual ~MultiTrackSink() override { }
};
}
#endif /* _MULTI_TRACK_SINK_H */
//***************************************************************************
//***************************************************************************
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