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100 lines
3.0 KiB
100 lines
3.0 KiB
15 years ago
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/***************************************************** vim:set ts=4 sw=4 sts=4:
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Description:
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Speeds up or slows down an audio file by stretching the audio stream.
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Uses the sox program to do the stretching.
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Copyright:
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(C) 2004 by Gary Cramblitt <garycramblitt@comcast.net>
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-------------------
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Original author: Gary Cramblitt <garycramblitt@comcast.net>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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******************************************************************************/
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// KDE includes.
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#include <kprocess.h>
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#include <kdebug.h>
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// Stretcher includes.
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#include "stretcher.h"
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#include "stretcher.moc"
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/**
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* Constructor.
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*/
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Stretcher::Stretcher(QObject *parent, const char *name) :
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QObject(parent, name)
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{
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m_state = 0;
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m_stretchProc = 0;
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}
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/**
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* Destructor.
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*/
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Stretcher::~Stretcher()
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{
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delete m_stretchProc;
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}
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/**
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* Stretch the given input file to an output file.
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* @param inFilename Name of input audio file.
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* @param outFilename Name of output audio file.
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* @param stretchFactor Amount to stretch. 2.0 is twice as slow. 0.5 is twice as fast.
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* @return False if an error occurs.
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*/
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bool Stretcher::stretch(const QString &inFilename, const QString &outFilename, float stretchFactor)
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{
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if (m_stretchProc) return false;
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m_outFilename = outFilename;
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m_stretchProc = new KProcess;
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QString stretchStr = QString("%1").arg(stretchFactor, 0, 'f', 3);
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*m_stretchProc << "sox" << inFilename << outFilename << "stretch" << stretchStr;
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connect(m_stretchProc, SIGNAL(processExited(KProcess*)),
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this, SLOT(slotProcessExited(KProcess*)));
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if (!m_stretchProc->start(KProcess::NotifyOnExit, KProcess::NoCommunication))
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{
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kdDebug() << "Stretcher::stretch: Error starting audio stretcher process. Is sox installed?" << endl;
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return false;
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}
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m_state = ssStretching;
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return true;
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}
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void Stretcher::slotProcessExited(KProcess*)
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{
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m_stretchProc->deleteLater();
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m_stretchProc = 0;
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m_state = ssFinished;
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emit stretchFinished();
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}
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/**
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* Returns the state of the Stretcher.
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*/
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int Stretcher::getState() { return m_state; }
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/**
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* Returns the output filename (as given in call to stretch).
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*/
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QString Stretcher::getOutFilename() { return m_outFilename; }
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/**
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* Acknowledges the finished stretching.
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*/
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void Stretcher::ackFinished() { m_state = ssIdle; }
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