trunk/src/qsamplerChannelStrip.cpp

// qsamplerChannelStrip.cpp
//
/****************************************************************************
   Copyright (C) 2004-2014, rncbc aka Rui Nuno Capela. All rights reserved.
   Copyright (C) 2007, 2008, 2014 Christian Schoenebeck

   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.

*****************************************************************************/

#include "qsamplerAbout.h"
#include "qsamplerChannelStrip.h"

#include "qsamplerMainForm.h"

#include "qsamplerChannelFxForm.h"

#include <QMessageBox>
#include <QDragEnterEvent>
#include <QFileInfo>
#include <QTimer>
#include <QUrl>
#include <QMenu>

#if QT_VERSION >= 0x050000
#include <QMimeData>
#endif

// Channel status/usage usage limit control.
#define QSAMPLER_ERROR_LIMIT    3

// Needed for lroundf()
#include <math.h>

#ifndef CONFIG_ROUND
static inline long lroundf ( float x )
{
        if (x >= 0.0f)
                return long(x + 0.5f);
        else
                return long(x - 0.5f);
}
#endif


namespace QSampler {

//-------------------------------------------------------------------------
// QSampler::ChannelStrip -- Channel strip form implementation.
//

// MIDI activity pixmap common resources.
int      ChannelStrip::g_iMidiActivityRefCount = 0;
QPixmap *ChannelStrip::g_pMidiActivityLedOn    = NULL;
QPixmap *ChannelStrip::g_pMidiActivityLedOff   = NULL;

// Channel strip activation/selection.
ChannelStrip *ChannelStrip::g_pSelectedStrip = NULL;

ChannelStrip::ChannelStrip ( QWidget* pParent, Qt::WindowFlags wflags )
        : QWidget(pParent, wflags)
{
        m_ui.setupUi(this);

        // Initialize locals.
        m_pChannel     = NULL;
        m_iDirtyChange = 0;
        m_iErrorCount  = 0;
        m_instrumentListPopupMenu = NULL;

        if (++g_iMidiActivityRefCount == 1) {
                g_pMidiActivityLedOn  = new QPixmap(":/images/ledon1.png");
                g_pMidiActivityLedOff = new QPixmap(":/images/ledoff1.png");
        }

        m_ui.MidiActivityLabel->setPixmap(*g_pMidiActivityLedOff);

#ifndef CONFIG_EVENT_CHANNEL_MIDI
        m_ui.MidiActivityLabel->setToolTip("MIDI activity (disabled)");
#endif

        m_pMidiActivityTimer = new QTimer(this);
        m_pMidiActivityTimer->setSingleShot(true);

        QObject::connect(m_pMidiActivityTimer,
                SIGNAL(timeout()),
                SLOT(midiActivityLedOff())
        );

        // Try to restore normal window positioning.
        adjustSize();

        QObject::connect(m_ui.ChannelSetupPushButton,
                SIGNAL(clicked()),
                SLOT(channelSetup()));
        QObject::connect(m_ui.ChannelMutePushButton,
                SIGNAL(toggled(bool)),
                SLOT(channelMute(bool)));
        QObject::connect(m_ui.ChannelSoloPushButton,
                SIGNAL(toggled(bool)),
                SLOT(channelSolo(bool)));
        QObject::connect(m_ui.VolumeSlider,
                SIGNAL(valueChanged(int)),
                SLOT(volumeChanged(int)));
        QObject::connect(m_ui.VolumeSpinBox,
                SIGNAL(valueChanged(int)),
                SLOT(volumeChanged(int)));
        QObject::connect(m_ui.ChannelEditPushButton,
                SIGNAL(clicked()),
                SLOT(channelEdit()));
        QObject::connect(m_ui.FxPushButton,
                SIGNAL(clicked()),
                SLOT(channelFxEdit()));

        setSelected(false);
}


ChannelStrip::~ChannelStrip (void)
{
        setSelected(false);

        // Destroy existing channel descriptor.
        if (m_pChannel)
                delete m_pChannel;
        m_pChannel = NULL;

        if (--g_iMidiActivityRefCount == 0) {
                if (g_pMidiActivityLedOn)
                        delete g_pMidiActivityLedOn;
                g_pMidiActivityLedOn = NULL;
                if (g_pMidiActivityLedOff)
                        delete g_pMidiActivityLedOff;
                g_pMidiActivityLedOff = NULL;
        }
}


// Window drag-n-drop event handlers.
void ChannelStrip::dragEnterEvent ( QDragEnterEvent* pDragEnterEvent )
{
        if (m_pChannel == NULL)
                return;

        bool bAccept = false;

        if (pDragEnterEvent->source() == NULL) {
                const QMimeData *pMimeData = pDragEnterEvent->mimeData();
                if (pMimeData && pMimeData->hasUrls()) {
                        QListIterator<QUrl> iter(pMimeData->urls());
                        while (iter.hasNext()) {
                                const QString& sFilename = iter.next().toLocalFile();
                                if (!sFilename.isEmpty()) {
                                //      bAccept = Channel::isDlsInstrumentFile(sFilename);
                                        bAccept = QFileInfo(sFilename).exists();
                                        break;
                                }
                        }
                }
        }

        if (bAccept)
                pDragEnterEvent->accept();
        else
                pDragEnterEvent->ignore();
}


void ChannelStrip::dropEvent ( QDropEvent* pDropEvent )
{
        if (m_pChannel == NULL)
                return;

        if (pDropEvent->source())
                return;

        const QMimeData *pMimeData = pDropEvent->mimeData();
        if (pMimeData && pMimeData->hasUrls()) {
                QStringList files;
                QListIterator<QUrl> iter(pMimeData->urls());
                while (iter.hasNext()) {
                        const QString& sFilename = iter.next().toLocalFile();
                        if (!sFilename.isEmpty()) {
                                // Go and set the dropped instrument filename...
                                m_pChannel->setInstrument(sFilename, 0);
                                // Open up the channel dialog.
                                channelSetup();
                                break;
                        }
                }
        }
}


// Channel strip setup formal initializer.
void ChannelStrip::setup ( Channel *pChannel )
{
        // Destroy any previous channel descriptor;
        // (remember that once setup we own it!)
        if (m_pChannel)
                delete m_pChannel;

        // Set the new one...
        m_pChannel = pChannel;

        // Stabilize this around.
        updateChannelInfo();

        // We'll accept drops from now on...
        if (m_pChannel)
                setAcceptDrops(true);
}


// Channel secriptor accessor.
Channel *ChannelStrip::channel (void) const
{
        return m_pChannel;
}


// Messages view font accessors.
QFont ChannelStrip::displayFont (void) const
{
        return m_ui.EngineNameTextLabel->font();
}

void ChannelStrip::setDisplayFont ( const QFont & font )
{
        m_ui.EngineNameTextLabel->setFont(font);
        m_ui.MidiPortChannelTextLabel->setFont(font);
        m_ui.InstrumentNamePushButton->setFont(font);
        m_ui.InstrumentStatusTextLabel->setFont(font);
}


// Channel display background effect.
void ChannelStrip::setDisplayEffect ( bool bDisplayEffect )
{
        QPalette pal;
        pal.setColor(QPalette::Foreground, Qt::yellow);
        pal.setColor(QPalette::ButtonText, Qt::yellow);
        m_ui.EngineNameTextLabel->setPalette(pal);
        m_ui.MidiPortChannelTextLabel->setPalette(pal);
        pal.setColor(QPalette::Foreground, Qt::green);
        pal.setColor(QPalette::ButtonText, Qt::green);
        if (bDisplayEffect) {
                QPixmap pm(":/images/displaybg1.png");
                pal.setBrush(QPalette::Background, QBrush(pm));
        } else {
                pal.setColor(QPalette::Background, Qt::black);
        }
        m_ui.ChannelInfoFrame->setPalette(pal);
        m_ui.InstrumentNamePushButton->setPalette(pal);
        m_ui.StreamVoiceCountTextLabel->setPalette(pal);
}


// Maximum volume slider accessors.
void ChannelStrip::setMaxVolume ( int iMaxVolume )
{
        m_iDirtyChange++;
        m_ui.VolumeSlider->setRange(0, iMaxVolume);
        m_ui.VolumeSpinBox->setRange(0, iMaxVolume);
        m_iDirtyChange--;
}


// Channel setup dialog slot.
bool ChannelStrip::channelSetup (void)
{
        if (m_pChannel == NULL)
                return false;

        // Invoke the channel setup dialog.
        bool bResult = m_pChannel->channelSetup(this);
        // Notify that this channel has changed.
        if (bResult)
                emit channelChanged(this);

        return bResult;
}


// Channel mute slot.
bool ChannelStrip::channelMute ( bool bMute )
{
        if (m_pChannel == NULL)
                return false;

        // Invoke the channel mute method.
        bool bResult = m_pChannel->setChannelMute(bMute);
        // Notify that this channel has changed.
        if (bResult)
                emit channelChanged(this);

        return bResult;
}


// Channel solo slot.
bool ChannelStrip::channelSolo ( bool bSolo )
{
        if (m_pChannel == NULL)
                return false;

        // Invoke the channel solo method.
        bool bResult = m_pChannel->setChannelSolo(bSolo);
        // Notify that this channel has changed.
        if (bResult)
                emit channelChanged(this);

        return bResult;
}


// Channel edit slot.
void ChannelStrip::channelEdit (void)
{
        if (m_pChannel == NULL)
                return;

        m_pChannel->editChannel();
}

bool ChannelStrip::channelFxEdit (void)
{
        MainForm *pMainForm = MainForm::getInstance();
        if (!pMainForm || !channel())
                return false;

        pMainForm->appendMessages(QObject::tr("channel fx sends..."));

        bool bResult = false;

#if CONFIG_FXSEND
        ChannelFxForm *pChannelFxForm =
                new ChannelFxForm(channel(), parentWidget());
        if (pChannelFxForm) {
                //pChannelForm->setup(this);
                bResult = pChannelFxForm->exec();
                delete pChannelFxForm;
        }
#else // CONFIG_FXSEND
        QMessageBox::critical(this,
                QSAMPLER_TITLE ": " + tr("Unavailable"),
                        tr("Sorry, QSampler was built without FX send support!\n\n"
                           "(Make sure you have a recent liblscp when recompiling QSampler)"));
#endif // CONFIG_FXSEND

        return bResult;
}

// Channel reset slot.
bool ChannelStrip::channelReset (void)
{
        if (m_pChannel == NULL)
                return false;

        // Invoke the channel reset method.
        bool bResult = m_pChannel->channelReset();
        // Notify that this channel has changed.
        if (bResult)
                emit channelChanged(this);

        return bResult;
}


// Update the channel instrument name.
bool ChannelStrip::updateInstrumentName ( bool bForce )
{
        if (m_pChannel == NULL)
                return false;

        // Do we refresh the actual name?
        if (bForce)
                m_pChannel->updateInstrumentName();

        // Instrument name...
        if (m_pChannel->instrumentName().isEmpty()) {
                if (m_pChannel->instrumentStatus() >= 0) {
                        m_ui.InstrumentNamePushButton->setText(
                                ' ' + Channel::loadingInstrument());
                } else {
                        m_ui.InstrumentNamePushButton->setText(
                                ' ' + Channel::noInstrumentName());
                }
        } else {
                m_ui.InstrumentNamePushButton->setText(
                        ' ' + m_pChannel->instrumentName());
        }
        
        bool bShowInstrumentPopup = false;

        // Instrument list popup (for fast switching among sounds of the same file)
        if (!m_pChannel->instrumentFile().isEmpty()) {
                const QStringList instruments
                        = Channel::getInstrumentList(m_pChannel->instrumentFile(), true);
                if (!instruments.isEmpty()) {
                        bShowInstrumentPopup = true;
                        if (!m_instrumentListPopupMenu) {
                                m_instrumentListPopupMenu
                                        = new QMenu(m_ui.InstrumentNamePushButton);
                                m_instrumentListPopupMenu->setTitle(tr("Instruments"));
                                // for cosmetical reasons, should have at least
                                // the width of the instrument name label...
                                m_instrumentListPopupMenu->setMinimumWidth(120);
                                m_ui.InstrumentNamePushButton->setMenu(m_instrumentListPopupMenu);
                                QObject::connect(m_instrumentListPopupMenu,
                                        SIGNAL(triggered(QAction*)),
                                        SLOT(instrumentListPopupItemClicked(QAction *)));
                        } else {
                                m_instrumentListPopupMenu->clear();
                        }
                        QAction *action;
                        for (int i = 0; i < instruments.size(); ++i) {
                                action = m_instrumentListPopupMenu->addAction(instruments.at(i));
                                action->setData(i);
                                action->setCheckable(true);
                                action->setChecked(i == m_pChannel->instrumentNr());
                        }
                }
        }

        if (!bShowInstrumentPopup && m_instrumentListPopupMenu) {
                delete m_instrumentListPopupMenu;
                m_instrumentListPopupMenu = NULL;
        }

        return true;
}

void ChannelStrip::instrumentListPopupItemClicked ( QAction *action )
{
        if (!action) return;

        QVariant data = action->data();
        if (data.isValid() && !m_pChannel->instrumentFile().isEmpty()) {
                m_pChannel->loadInstrument(m_pChannel->instrumentFile(), data.toInt());
                emit channelChanged(this);
        }
}

// Do the dirty volume change.
bool ChannelStrip::updateChannelVolume (void)
{
        if (m_pChannel == NULL)
                return false;

        // Convert...
        int iVolume = ::lroundf(100.0f * m_pChannel->volume());
        // And clip...
        if (iVolume < 0)
                iVolume = 0;

        // Flag it here, to avoid infinite recursion.
        m_iDirtyChange++;
        m_ui.VolumeSlider->setValue(iVolume);
        m_ui.VolumeSpinBox->setValue(iVolume);
        m_iDirtyChange--;

        return true;
}


// Update whole channel info state.
bool ChannelStrip::updateChannelInfo (void)
{
        if (m_pChannel == NULL)
                return false;

        // Check for error limit/recycle...
        if (m_iErrorCount > QSAMPLER_ERROR_LIMIT)
                return true;

        // Update strip caption.
        QString sText = m_pChannel->channelName();
        setWindowTitle(sText);
        m_ui.ChannelSetupPushButton->setText('&' + sText);

        // Check if we're up and connected.
        MainForm* pMainForm = MainForm::getInstance();
        if (pMainForm->client() == NULL)
                return false;

        // Read actual channel information.
        m_pChannel->updateChannelInfo();

        // Engine name...
        if (m_pChannel->engineName().isEmpty()) {
                m_ui.EngineNameTextLabel->setText(
                        ' ' + Channel::noEngineName());
        } else {
                m_ui.EngineNameTextLabel->setText(
                        ' ' + m_pChannel->engineName());
        }

        // Instrument name...
        updateInstrumentName(false);

        // MIDI Port/Channel...
        QString sMidiPortChannel = QString::number(m_pChannel->midiPort()) + " / ";
        if (m_pChannel->midiChannel() == LSCP_MIDI_CHANNEL_ALL)
                sMidiPortChannel += tr("All");
        else
                sMidiPortChannel += QString::number(m_pChannel->midiChannel() + 1);
        m_ui.MidiPortChannelTextLabel->setText(sMidiPortChannel);

        // Common palette...
        QPalette pal;
        const QColor& rgbFore = pal.color(QPalette::Foreground);

        // Instrument status...
        const int iInstrumentStatus = m_pChannel->instrumentStatus();
        if (iInstrumentStatus < 0) {
                pal.setColor(QPalette::Foreground, Qt::red);
                m_ui.InstrumentStatusTextLabel->setPalette(pal);
                m_ui.InstrumentStatusTextLabel->setText(
                        tr("ERR%1").arg(iInstrumentStatus));
                m_iErrorCount++;
                return false;
        }

        // All seems normal...
        pal.setColor(QPalette::Foreground,
                iInstrumentStatus < 100 ? Qt::yellow : Qt::green);
        m_ui.InstrumentStatusTextLabel->setPalette(pal);
        m_ui.InstrumentStatusTextLabel->setText(
                QString::number(iInstrumentStatus) + '%');
        m_iErrorCount = 0;

#ifdef CONFIG_MUTE_SOLO
        // Mute/Solo button state coloring...
        bool bMute = m_pChannel->channelMute();
        const QColor& rgbButton = pal.color(QPalette::Button);
        const QColor& rgbButtonText = pal.color(QPalette::ButtonText);
        pal.setColor(QPalette::Foreground, rgbFore);
        pal.setColor(QPalette::Button, bMute ? Qt::yellow : rgbButton);
        pal.setColor(QPalette::ButtonText, bMute ? Qt::darkYellow : rgbButtonText);
        m_ui.ChannelMutePushButton->setPalette(pal);
        m_ui.ChannelMutePushButton->setDown(bMute);
        bool bSolo = m_pChannel->channelSolo();
        pal.setColor(QPalette::Button, bSolo ? Qt::cyan : rgbButton);   
        pal.setColor(QPalette::ButtonText, bSolo ? Qt::darkCyan : rgbButtonText);
        m_ui.ChannelSoloPushButton->setPalette(pal);
        m_ui.ChannelSoloPushButton->setDown(bSolo);
#else
        m_ui.ChannelMutePushButton->setEnabled(false);
        m_ui.ChannelSoloPushButton->setEnabled(false);
#endif

        // And update the both GUI volume elements;
        // return success if, and only if, intrument is fully loaded...
        return updateChannelVolume() && (iInstrumentStatus == 100);
}


// Update whole channel usage state.
bool ChannelStrip::updateChannelUsage (void)
{
        if (m_pChannel == NULL)
                return false;

        MainForm *pMainForm = MainForm::getInstance();
        if (pMainForm->client() == NULL)
                return false;

        // This only makes sense on fully loaded channels...
        if (m_pChannel->instrumentStatus() < 100)
                return false;

        // Get current channel voice count.
        int iVoiceCount  = ::lscp_get_channel_voice_count(
                pMainForm->client(), m_pChannel->channelID());
// Get current stream count.
        int iStreamCount = ::lscp_get_channel_stream_count(
                pMainForm->client(), m_pChannel->channelID());
        // Get current channel buffer fill usage.
        // As benno has suggested this is the percentage usage
        // of the least filled buffer stream...
        int iStreamUsage = ::lscp_get_channel_stream_usage(
                pMainForm->client(), m_pChannel->channelID());;

        // Update the GUI elements...
        m_ui.StreamUsageProgressBar->setValue(iStreamUsage);
        m_ui.StreamVoiceCountTextLabel->setText(
                QString("%1 / %2").arg(iStreamCount).arg(iVoiceCount));

        // We're clean.
        return true;
}


// Volume change slot.
void ChannelStrip::volumeChanged ( int iVolume )
{
        if (m_pChannel == NULL)
                return;

        // Avoid recursion.
        if (m_iDirtyChange > 0)
                return;

        // Convert and clip.
        float fVolume = (float) iVolume / 100.0f;
        if (fVolume < 0.001f)
                fVolume = 0.0f;

        // Update the GUI elements.
        if (m_pChannel->setVolume(fVolume)) {
                updateChannelVolume();
                emit channelChanged(this);
        }
}


// Context menu event handler.
void ChannelStrip::contextMenuEvent( QContextMenuEvent *pEvent )
{
        if (m_pChannel == NULL)
                return;

        // We'll just show up the main form's edit menu (thru qsamplerChannel).
        m_pChannel->contextMenuEvent(pEvent);
}


void ChannelStrip::midiActivityLedOn (void)
{
        m_ui.MidiActivityLabel->setPixmap(*g_pMidiActivityLedOn);
        m_pMidiActivityTimer->start(100);
}


void ChannelStrip::midiActivityLedOff (void)
{
        m_ui.MidiActivityLabel->setPixmap(*g_pMidiActivityLedOff);
}


// Error count hackish accessors.
void ChannelStrip::resetErrorCount (void)
{
        m_iErrorCount = 0;
}


// Channel strip activation/selection.
void ChannelStrip::setSelected ( bool bSelected )
{
        if (bSelected) {
                if (g_pSelectedStrip == this)
                        return;
                if (g_pSelectedStrip)
                        g_pSelectedStrip->setSelected(false);
                g_pSelectedStrip = this;
        } else {
                if (g_pSelectedStrip == this)
                        g_pSelectedStrip = NULL;
        }

        QPalette pal;
        if (bSelected) {
                const QColor& color = pal.midlight().color();
                pal.setColor(QPalette::Background, color.dark(150));
                pal.setColor(QPalette::Foreground, color.light(150));
        }
        QWidget::setPalette(pal);
}


bool ChannelStrip::isSelected (void) const
{
        return (this == g_pSelectedStrip);
}


} // namespace QSampler


// end of qsamplerChannelStrip.cpp