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/*************************************************************************
VirtualAudioFile.h - adapter between QIODevice and libaudiofile
-------------------
begin : Mon May 06 2002
copyright : (C) 2002 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 _VIRTUAL_AUDIO_FILE_H_
#define _VIRTUAL_AUDIO_FILE_H_
#include "config.h"
#include <kdemacros.h>
#include <QMap>
extern "C" {
#include <audiofile.h>
#include <af_vfs.h>
}
class QIODevice;
/**
* This class builds an interface between a QIODevice and a virtual
* file in libaudiofile.
*/
class KDE_EXPORT VirtualAudioFile
{
public:
/**
* Constructor
* @param device QIODevice used as source/destination
*/
VirtualAudioFile(QIODevice &device);
/** Destructor */
virtual ~VirtualAudioFile();
/** opens the file through libaudiofile */
virtual void open(VirtualAudioFile *x, AFfilesetup setup);
/**
* Closes the file from libaudiofile side. The associated
* QIODevice will not be touched.
* @note This has not necessarily to be called, it will closed
* automatically in the destructor.
*/
virtual void close();
/** Returns the handle for use in libaudiofile */
inline AFfilehandle &handle() { return m_file_handle; }
/** Returns the virtual file for use in libaudiofile */
inline AFvirtualfile *file() { return m_virtual_file; }
/** Returns the last error from libaudiofile (-1 means "no error") */
inline long int lastError() { return m_last_error; }
/**
* returns the last error text from libaudiofile, not localized
* @note this is only valid in case of lastError is not -1
*/
inline QString lastErrorText() { return m_last_error_text; }
/** reads a block of data */
virtual unsigned int read(char *data, unsigned int nbytes);
/** returns the length of the file */
virtual qint64 length();
/** writes a block of data */
virtual unsigned int write(const char *data, unsigned int nbytes);
/** called to close the source */
virtual void destroy();
/** seek to a file position */
virtual qint64 seek(qint64 offset, bool is_relative);
/** returns the file position */
virtual qint64 tell();
/** returns a VirtualAudioFile for a libasound virtual file */
static VirtualAudioFile *adapter(AFvirtualfile *vfile);
private:
/** i/o device to Qt */
QIODevice &m_device;
/** file handle used in libaudiofile */
AFfilehandle m_file_handle;
/** virtual file, used in libaudiofile */
AFvirtualfile *m_virtual_file;
/** last error code from libaudiofile */
long int m_last_error;
/** last error text from libaudiofile */
QString m_last_error_text;
};
#endif /* _VIRTUAL_AUDIO_FILE_H_ */