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FilterPlugin.cpp    236 lines (197 with data), 7.2 kB

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/***************************************************************************
FilterPlugin.cpp - generic class for filter plugins with setup
-------------------
begin : Sat Jun 07 2003
copyright : (C) 2003 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. *
* *
***************************************************************************/
#include "config.h"
#include <errno.h>
#include <unistd.h>
#include <QApplication>
#include <QDialog>
#include <QStringList>
#include <klocale.h>
#include "libkwave/Connect.h"
#include "libkwave/MultiTrackReader.h"
#include "libkwave/MultiTrackWriter.h"
#include "libkwave/PluginManager.h"
#include "libkwave/SampleSink.h"
#include "libkwave/modules/KwaveStreamObject.h"
#include "libkwave/undo/UndoTransactionGuard.h"
#include "libgui/FilterPlugin.h"
//***************************************************************************
Kwave::FilterPlugin::FilterPlugin(const PluginContext &context)
:Kwave::Plugin(context), m_params(),
m_listen(false), m_pause(false), m_sink(0)
{
}
//***************************************************************************
Kwave::FilterPlugin::~FilterPlugin()
{
}
//***************************************************************************
QStringList *Kwave::FilterPlugin::setup(QStringList &previous_params)
{
// try to interprete and use the previous parameters
if (!interpreteParameters(previous_params))
m_params = previous_params;
// create the setup dialog
KwavePluginSetupDialog *setup_dialog = createDialog(parentWidget());
Q_ASSERT(setup_dialog);
if (!setup_dialog) return 0;
// connect the signals for the pre-listen handling
QDialog *dlg = setup_dialog->dialog();
connect(dlg, SIGNAL(startPreListen()),
this, SLOT(startPreListen()));
connect(dlg, SIGNAL(stopPreListen()),
this, SLOT(stopPreListen()));
connect(this, SIGNAL(sigDone(Kwave::Plugin *)),
dlg, SLOT(listenStopped()));
if (!m_params.isEmpty()) setup_dialog->setParams(m_params);
QStringList *list = new QStringList();
Q_ASSERT(list);
if (list && dlg->exec()) {
// user has pressed "OK"
*list = setup_dialog->params();
} else {
// user pressed "Cancel"
if (list) delete list;
list = 0;
}
if (setup_dialog) delete setup_dialog;
return list;
}
//***************************************************************************
void Kwave::FilterPlugin::run(QStringList params)
{
UndoTransactionGuard *undo_guard = 0;
m_pause = false;
if (!interpreteParameters(params)) m_params = params;
sample_index_t first, last;
QList<unsigned int> tracks;
selection(&tracks, &first, &last, true);
// switch to interactive mode in pre-listen mode
Kwave::StreamObject::setInteractive(m_listen);
// create all objects
MultiTrackReader source(
(m_listen) ? Kwave::FullSnapshot : Kwave::SinglePassForward,
signalManager(), tracks, first, last);
Kwave::SampleSource *filter = createFilter(tracks.count());
Q_ASSERT(filter);
if (m_listen) {
// pre-listen mode
Q_ASSERT(m_sink);
} else {
// normal mode, with undo
undo_guard = new UndoTransactionGuard(*this, actionName());
Q_ASSERT(undo_guard);
if (!undo_guard) {
if (filter) delete filter;
Kwave::StreamObject::setInteractive(false);
return;
}
m_sink = new MultiTrackWriter(signalManager(), tracks,
Overwrite, first, last);
Q_ASSERT(m_sink);
}
if (!filter || !m_sink || m_sink->done()) {
if (filter) delete filter;
if (undo_guard) delete undo_guard;
if (m_sink) delete m_sink;
m_sink = 0;
Kwave::StreamObject::setInteractive(false);
return;
}
// set up the progress dialog when in processing (not pre-listen) mode
if (!m_listen) {
connect(&source, SIGNAL(progress(qreal)),
this, SLOT(updateProgress(qreal)),
Qt::BlockingQueuedConnection);
}
// force initial update of the filter settings
updateFilter(filter, true);
// connect them
Kwave::connect(source, SIGNAL(output(Kwave::SampleArray)),
*filter, SLOT(input(Kwave::SampleArray)));
Kwave::connect(*filter, SIGNAL(output(Kwave::SampleArray)),
*m_sink, SLOT(input(Kwave::SampleArray)));
// transport the samples
while (!shouldStop() && (!source.done() || m_listen)) {
// process one step
source.goOn();
filter->goOn();
// watch out for changed parameters when in
// pre-listen mode
if (m_listen && paramsChanged()) {
updateFilter(filter);
}
if (m_listen && source.done()) {
// start the next loop
source.reset();
continue;
}
// this lets the process wait if the user pressed cancel
// and the confirm_cancel dialog is active
while (m_pause && !shouldStop())
sleep(1);
}
// cleanup
if (filter) delete filter;
if (m_sink) delete m_sink;
m_sink = 0;
if (undo_guard) delete undo_guard;
m_pause = false;
m_listen = false;
Kwave::StreamObject::setInteractive(false);
}
//***************************************************************************
bool Kwave::FilterPlugin::paramsChanged()
{
return false;
}
//***************************************************************************
void Kwave::FilterPlugin::updateFilter(Kwave::SampleSource * /*filter*/,
bool /*force*/)
{
/* default implementation, does nothing */
}
//***************************************************************************
void Kwave::FilterPlugin::startPreListen()
{
Q_ASSERT(!m_sink);
if (m_sink) delete m_sink;
m_sink = manager().openMultiTrackPlayback(selectedTracks().count());
Q_ASSERT(m_sink);
if (m_sink) {
m_listen = true;
setProgressDialogEnabled(false);
static QStringList empty_list;
execute(empty_list);
}
}
//***************************************************************************
void Kwave::FilterPlugin::stopPreListen()
{
stop();
m_listen = false;
setProgressDialogEnabled(true);
}
//***************************************************************************
QString Kwave::FilterPlugin::progressText()
{
return i18n("Applying '%1'...", actionName());
}
//***************************************************************************
using namespace Kwave;
#include "FilterPlugin.moc"
//***************************************************************************
//***************************************************************************