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Diffstat (limited to 'kttsd/libkttsd/stretcher.cpp')
-rw-r--r-- | kttsd/libkttsd/stretcher.cpp | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/kttsd/libkttsd/stretcher.cpp b/kttsd/libkttsd/stretcher.cpp new file mode 100644 index 0000000..d3a3984 --- /dev/null +++ b/kttsd/libkttsd/stretcher.cpp @@ -0,0 +1,99 @@ +/***************************************************** 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; } + |