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/***************************************************** vim:set ts=4 sw=4 sts=4:
Description:
Speeds up or slows down an audio file by stretching the audio stream.
Uses the sox program to do the stretching.
Copyright:
(C) 2004 by Gary Cramblitt <garycramblitt@comcast.net>
-------------------
Original author: Gary Cramblitt <garycramblitt@comcast.net>
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.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
******************************************************************************/
// KDE includes.
#include <kprocess.h>
#include <kdebug.h>
// Stretcher includes.
#include "stretcher.h"
#include "stretcher.moc"
/**
* Constructor.
*/
Stretcher::Stretcher(QObject *parent, const char *name) :
QObject(parent, name)
{
m_state = 0;
m_stretchProc = 0;
}
/**
* Destructor.
*/
Stretcher::~Stretcher()
{
delete m_stretchProc;
}
/**
* Stretch the given input file to an output file.
* @param inFilename Name of input audio file.
* @param outFilename Name of output audio file.
* @param stretchFactor Amount to stretch. 2.0 is twice as slow. 0.5 is twice as fast.
* @return False if an error occurs.
*/
bool Stretcher::stretch(const QString &inFilename, const QString &outFilename, float stretchFactor)
{
if (m_stretchProc) return false;
m_outFilename = outFilename;
m_stretchProc = new KProcess;
QString stretchStr = QString("%1").arg(stretchFactor, 0, 'f', 3);
*m_stretchProc << "sox" << inFilename << outFilename << "stretch" << stretchStr;
connect(m_stretchProc, SIGNAL(processExited(KProcess*)),
this, SLOT(slotProcessExited(KProcess*)));
if (!m_stretchProc->start(KProcess::NotifyOnExit, KProcess::NoCommunication))
{
kdDebug() << "Stretcher::stretch: Error starting audio stretcher process. Is sox installed?" << endl;
return false;
}
m_state = ssStretching;
return true;
}
void Stretcher::slotProcessExited(KProcess*)
{
m_stretchProc->deleteLater();
m_stretchProc = 0;
m_state = ssFinished;
emit stretchFinished();
}
/**
* Returns the state of the Stretcher.
*/
int Stretcher::getState() { return m_state; }
/**
* Returns the output filename (as given in call to stretch).
*/
QString Stretcher::getOutFilename() { return m_outFilename; }
/**
* Acknowledges the finished stretching.
*/
void Stretcher::ackFinished() { m_state = ssIdle; }
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