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/***************************************************************************
MultiTrackReader.h - reader for multi-track signals
-------------------
begin : Sat Jun 30 2001
copyright : (C) 2001 by Thomas Eschenbacher
email : Thomas Eschenbacher <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_READER_H_
#define _MULTI_TRACK_READER_H_
#include "config.h"
#include <QObject>
#include <QList>
#include <kdemacros.h>
#include "libkwave/SampleReader.h"
#include "libkwave/KwaveMultiTrackSource.h"
class SignalManager;
/**
* A MultiTrackReader encapsulates a set of <c>SampleReader</c>s for
* easier use of multi-track signals.
*/
class KDE_EXPORT MultiTrackReader
:public Kwave::MultiTrackSource<SampleReader, false>
{
Q_OBJECT
private:
/** Default constructor */
MultiTrackReader();
public:
/**
* Constructor
* @param mode a reader mode, see Kwave::ReaderMode
* @param signal_manager reference to a SignalManager
* @param track_list array of indices of tracks for writing
* @param first index of the first sample (left)
* @param last index of the last sample (right)
*/
MultiTrackReader(Kwave::ReaderMode mode,
SignalManager &signal_manager,
const QList<unsigned int> &track_list,
sample_index_t first, sample_index_t last);
/** Destructor */
virtual ~MultiTrackReader();
/**
* Returns the offset of the reader, as
* passed to the constructor as "first"
*/
virtual sample_index_t first() const;
/**
* Returns the last sample offset of the reader, as
* passed to the constructor as "last"
*/
virtual sample_index_t last() const;
/** Returns true if one of the readers has reached eof() */
virtual bool eof() const;
/** @see QList::isEmpty() */
inline virtual bool isEmpty() const {
return (Kwave::MultiTrackSource<SampleReader, false>::tracks() < 1);
}
/** returns true if the transfer has been canceled */
inline bool isCanceled() const { return m_canceled; }
/** @see QList::insert() */
virtual bool insert(unsigned int track, SampleReader *reader);
/** Skips a number of samples. */
virtual void skip(sample_index_t count);
/** Seeks to a given position */
virtual void seek(sample_index_t pos);
signals:
/**
* Emits the current progress in percent [0...100].
*/
void progress(qreal percent);
public slots:
/**
* Can be connected to some progress dialog to cancel the current
* transfer.
*/
void cancel();
/** Resets all readers to zero */
void reset();
private slots:
/**
* Connected to each SampleReader to get informed about their progress.
*/
void proceeded();
protected:
/** index of the first sample to read */
sample_index_t m_first;
/** index of the last sample to read */
sample_index_t m_last;
/**
* Initialized as false, will be true if the transfer has
* been canceled
*/
bool m_canceled;
};
#endif /* _MULTI_TRACK_READER_H_ */