TrackHandler.cpp 8.86 KB
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/*****************************************************************************
 * TrackHandler.cpp : Handle multiple track of a kind (audio or video)
 *****************************************************************************
 * Copyright (C) 2008-2009 the VLMC team
 *
 * Authors: Hugo Beauzee-Luyssen <hugo@vlmc.org>
 *
 * 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 "TrackHandler.h"

TrackHandler::TrackHandler( unsigned int nbTracks, TrackWorkflow::TrackType trackType ) :
        m_trackCount( nbTracks ),
        m_trackType( trackType ),
        m_length( 0 )
{
    m_tracks = new Toggleable<TrackWorkflow*>[nbTracks];
    for ( unsigned int i = 0; i < nbTracks; ++i )
    {
        m_tracks[i].setPtr( new TrackWorkflow( i, TrackWorkflow::Video ) );
        connect( m_tracks[i], SIGNAL( trackEndReached( unsigned int ) ), this, SLOT( trackEndReached(unsigned int) ) );
        connect( m_tracks[i], SIGNAL( trackPaused() ), this, SLOT( trackPaused() ) );
        connect( m_tracks[i], SIGNAL( trackUnpaused() ), this, SLOT( trackUnpaused() ) );
        connect( m_tracks[i], SIGNAL( renderCompleted( unsigned int ) ), this,  SLOT( tracksRenderCompleted( unsigned int ) ), Qt::QueuedConnection );
    }
    m_highestTrackNumberMutex = new QMutex;
    m_nbTracksToRenderMutex = new QMutex;

}

TrackHandler::~TrackHandler()
{
    delete m_highestTrackNumberMutex;
    delete m_nbTracksToRenderMutex;

    for (unsigned int i = 0; i < m_trackCount; ++i)
        delete m_tracks[i];
    delete[] m_tracks;
}

void        TrackHandler::addClip( Clip* clip, unsigned int trackId, qint64 start )
{
    Q_ASSERT_X( trackId < m_trackCount, "MainWorkflow::addClip",
                "The specified trackId isn't valid, for it's higher than the number of tracks");

    m_tracks[trackId]->addClip( clip, start );
    //if the track is deactivated, we need to reactivate it.
    if ( m_tracks[trackId].deactivated() == true )
        activateTrack( trackId );

    //Now check if this clip addition has changed something about the workflow's length
    if ( m_tracks[trackId]->getLength() > m_length )
        m_length = m_tracks[trackId]->getLength();
}

void        TrackHandler::startRender()
{
    m_paused = false;
    for ( unsigned int i = 0; i < m_trackCount; ++i )
        activateTrack( i );
    computeLength();
}

void        TrackHandler::computeLength()
{
    qint64      maxLength = 0;

    for ( unsigned int i = 0; i < m_trackCount; ++i )
    {
        if ( m_tracks[i]->getLength() > maxLength )
            maxLength = m_tracks[i]->getLength();
    }
    m_length = maxLength;
}

qint64      TrackHandler::getLength() const
{
    return m_length;
}

void        TrackHandler::getOutput( qint64 currentFrame )
{
    {
        QMutexLocker    lockHighestTrackNumber( m_highestTrackNumberMutex );
        m_highestTrackNumber = 0;
    }
    m_renderCompleted = false;
    m_nbTracksToRender = 0;
    m_synchroneRenderingBuffer = NULL;
    QMutexLocker    lockNbTracks( m_nbTracksToRenderMutex );
    for ( unsigned int i = 0; i < m_trackCount; ++i )
    {
        if ( m_tracks[i].activated() == false )
            continue ;

        ++m_nbTracksToRender;
        m_tracks[i]->getOutput( currentFrame );
    }
}

void        TrackHandler::pause()
{
    m_nbTracksToPause = 0;
    for ( unsigned int i = 0; i < m_trackCount; ++i )
    {
        if ( m_tracks[i].activated() == true )
        {
            m_nbTracksToPause.fetchAndAddAcquire( 1 );
            m_tracks[i]->pause();
        }
    }
}

void        TrackHandler::unpause()
{
    m_nbTracksToUnpause = 0;
    for ( unsigned int i = 0; i < m_trackCount; ++i )
    {
        if ( m_tracks[i].activated() == true )
        {
            m_nbTracksToUnpause.fetchAndAddAcquire( 1 );
            m_tracks[i]->unpause();
        }
    }
}

void        TrackHandler::activateAll()
{
    for ( unsigned int i = 0; i < m_trackCount; ++i )
        activateTrack( i );
}

void        TrackHandler::activateTrack( unsigned int trackId )
{
    if ( m_tracks[trackId]->getLength() > 0 )
        m_tracks[trackId].activate();
    else
        m_tracks[trackId].deactivate();
}

qint64      TrackHandler::getClipPosition( const QUuid& uuid, unsigned int trackId ) const
{
    Q_ASSERT( trackId < m_trackCount );

    return m_tracks[trackId]->getClipPosition( uuid );
}

void        TrackHandler::stop()
{
    for (unsigned int i = 0; i < m_trackCount; ++i)
    {
        if ( m_tracks[i].activated() == true )
            m_tracks[i]->stop();
    }
}

void        TrackHandler::moveClip(const QUuid& clipUuid, unsigned int oldTrack,
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                                       unsigned int newTrack, qint64 startingFrame )
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{
     Q_ASSERT( newTrack < m_trackCount && oldTrack < m_trackCount );

    if ( oldTrack == newTrack )
    {
        //And now, just move the clip.
        m_tracks[newTrack]->moveClip( clipUuid, startingFrame );
        activateTrack( newTrack );
    }
    else
    {
        bool    needRepo;

        if ( m_tracks[oldTrack]->getClipPosition( clipUuid ) != startingFrame )
            needRepo = true;
        ClipWorkflow* cw = m_tracks[oldTrack]->removeClipWorkflow( clipUuid );
        m_tracks[newTrack]->addClip( cw, startingFrame );
        if ( needRepo == true )
            m_tracks[newTrack]->forceRepositionning();
        activateTrack( oldTrack );
        activateTrack( newTrack );
    }
    computeLength();
}

Clip*       TrackHandler::removeClip( const QUuid& uuid, unsigned int trackId )
{
    Q_ASSERT( trackId < m_trackCount );

    Clip* clip = m_tracks[trackId]->removeClip( uuid );
    computeLength();
    activateTrack( trackId );
    return clip;
}

void        TrackHandler::muteTrack( unsigned int trackId )
{
    m_tracks[trackId].setHardDeactivation( true );
}

void        TrackHandler::unmuteTrack( unsigned int trackId )
{
    m_tracks[trackId].setHardDeactivation( false );
}

Clip*       TrackHandler::getClip( const QUuid& uuid, unsigned int trackId )
{
    Q_ASSERT( trackId < m_trackCount );

    return m_tracks[trackId]->getClip( uuid );
}

void        TrackHandler::clear()
{
    for ( unsigned int i = 0; i < m_trackCount; ++i )
    {
        m_tracks[i]->clear();
    }
    m_length = 0;
}

void        TrackHandler::setFullSpeedRender( bool value )
{
    for ( unsigned int i = 0; i < m_trackCount; ++i )
        m_tracks[i]->setFullSpeedRender( value );
}

bool        TrackHandler::isPaused() const
{
    return m_paused;
}

bool        TrackHandler::allTracksRendered() const
{
    return m_renderCompleted;
}

void        TrackHandler::trackEndReached( unsigned int trackId )
{
    m_tracks[trackId].deactivate();

    for ( unsigned int i = 0; i < m_trackCount; ++i)
    {
        if ( m_tracks[i].activated() == true )
            return ;
    }
    //FIXME::
    //emit mainWorkflowEndReached();
}

void        TrackHandler::trackPaused()
{
    m_nbTracksToPause.fetchAndAddAcquire( -1 );
    if ( m_nbTracksToPause <= 0 )
    {
        m_paused = true;
        emit tracksPaused();
    }
}

void        TrackHandler::trackUnpaused()
{
    m_nbTracksToUnpause.fetchAndAddAcquire( -1 );
    if ( m_nbTracksToUnpause <= 0 )
    {
        m_paused = false;
        //FIXME:
        //emit mainWorkflowUnpaused();
    }
}

void        TrackHandler::tracksRenderCompleted( unsigned int trackId )
{
//    qDebug() << "tracksRenderCompleted";
    QMutexLocker    lockNbTracks( m_nbTracksToRenderMutex );
    --m_nbTracksToRender;

    {
        QMutexLocker    lock( m_highestTrackNumberMutex );

        unsigned char* buff = m_tracks[trackId]->getSynchroneOutput();
        if ( m_highestTrackNumber <= trackId && buff != NULL )
        {
            m_highestTrackNumber = trackId;
            m_synchroneRenderingBuffer = buff;;
        }
    }
    //We check for minus or equal, since we can have 0 frame to compute,
    //therefore, m_nbTracksToRender will be equal to -1
    if ( m_nbTracksToRender <= 0 )
    {
//        qDebug() << "main workflow render completed";
        //Just a synchronisation barriere
        m_renderCompleted = true;
        emit allTracksRenderCompleted();
    }
}

unsigned int    TrackHandler::getTrackCount() const
{
    return m_trackCount;
}
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unsigned char*          TrackHandler::getSynchroneOutput()
{
    return m_synchroneRenderingBuffer;
}