mplayerthumbs/src/videopreview.cpp

/***************************************************************************
   Copyright (C) 2006
   by Marco Gulino <marco@kmobiletools.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 "videopreview.h"

#include <ntqfile.h>
#include <ntqpixmap.h>
#include <ntqimage.h>

#include <kstandarddirs.h>
#include <kpixmapsplitter.h>
#include <kmimetype.h>
#include <ntqpainter.h>
#include <krandomsequence.h>
#include <ntqdatetime.h>
#include <ntqregexp.h>
#include "videopreview.h"
#include <ntqprocess.h>
#include <kdebug.h>
#include <ktempdir.h>
#include <kurl.h>
#include <math.h>
#include <ntqfileinfo.h>

#include <cstdlib>
#include <unistd.h>

#include "mplayerthumbs.h"

#include "config.h"
extern "C"
{
    KDE_EXPORT ThumbCreator *new_creator()
    {
        return new VideoPreview;
    }
}

VideoPreview::VideoPreview()
    : m_splitter(0),
      m_data(0),
      m_dataSize(0)
{
}

VideoPreview::~VideoPreview()
{
    delete m_splitter;
    delete [] m_data;
    delete tmpdir;
    delete rand;
    delete mplayerprocess;
}

bool VideoPreview::create(const TQString &path, int width, int height, TQImage &img)
{
    MPlayerThumbsCfg *cfg=new MPlayerThumbsCfg();
    TQFileInfo fi(path);
        kdDebug() << "videopreview: file extension=\"" << fi.extension().stripWhiteSpace() << "\"\n";
        if( fi.extension().stripWhiteSpace().length() && !cfg->noextensions().grep(fi.extension().stripWhiteSpace(), false)
         .isEmpty() )
    {
        delete cfg;
        kdDebug() << "videopreview: matched extension " << fi.extension().prepend('.') << "; exiting.\n";
        return false;
    }
    playerBin=cfg->mplayerbin();
    customargs=TQStringList::split(" ", cfg->customargs() );
    kdDebug() << "videopreview: customargs=" << cfg->customargs() << " ;;;; " << customargs << endl;
    delete cfg;
    if(playerBin.length()) kdDebug() << "videopreview: found playerbin from config: " << playerBin << endl;
    else
    {
        playerBin=TDEStandardDirs::findExe("mplayer-bin");
        if(!playerBin.length()) playerBin=TDEStandardDirs::findExe("mplayer");
        if(!playerBin.length())
        {
            kdDebug() << "videopreview: mplayer not found, exiting. Run mplayerthumbsconfig to setup mplayer path manually.\n";
            return false;
        }
        kdDebug() << "videopreview: found playerbin from path: " << playerBin << endl;
    }
    fileinfo.seconds=0;
    fileinfo.fps=0;
    tmpdir=new KTempDir();
    if(tmpdir->name().isNull() ) return false;

    rand=new KRandomSequence(TQDateTime::currentDateTime().toTime_t());
    mplayerprocess=new TQProcess();
    int flags=0;
    KURL furl(path);
    kdDebug() << "videopreview: url=" << furl << "; local:" << furl.isLocalFile() << endl;
    fileinfo.towidth=width;
    fileinfo.toheight=height;
    TQPixmap pix;
//    if(furl.isLocalFile())
//    {
        flags=framerandom;
        TQStringList args;
        args << playerBin << path << "-nocache" << "-identify" << "-vo" << "null" << "-frames" << "0"/* << "-nosound" */<< "-ao" << "null";
        args+= customargs;
        mplayerprocess->setArguments(args);
        mplayerprocess->setCommunication( TQProcess::Stdout );
        mplayerprocess->start();
        TQString lineout;
        TQRegExp findsecs("^ID_LENGTH=([\\d]*)");
        TQRegExp findfps("^ID_VIDEO_FPS=([\\d]*)");
        while (mplayerprocess->isRunning() ) usleep (10);
        do {
            lineout=mplayerprocess->readLineStdout();
            if(findsecs.search( lineout) != -1)
                fileinfo.seconds =findsecs.cap(1).toInt();
            if(findfps.search( lineout) != -1)
                fileinfo.fps=findfps.cap(1).toInt();
            if( fileinfo.fps!=0 && fileinfo.seconds!=0 ) break;
        } while (lineout != TQString::null );
        kdDebug() << "videopreview: find length=" << fileinfo.seconds << ", fps=" << fileinfo.fps << endl;
/*    } else
    {
        flags=frameend;
    }*/
#define LASTTRY 3
    for(int i=0; i<=LASTTRY; i++)
    {
        kdDebug() << "videopreview: try " << i << endl;
        pix=getFrame(path, ((i<LASTTRY) ? flags : framestart ) );
        if(!pix.isNull()) {
            uint variance=imageVariance(pix.convertToImage()/*.bits(),( (width+ 7) & ~0x7), width, height, 1 */);
            kdDebug() << "videopreview: " << TQFileInfo(path).fileName() << " frame variance: " << variance << "; " << 
                    ((variance<=40 && ( i!=LASTTRY-1))? "!!!DROPPING!!!" : "GOOD :-)" ) << endl;
            if(variance>40 || i==LASTTRY-1 ) break;
        }
    }
    if(pix.isNull() )
    {
        if(tmpdir) tmpdir->unlink();
        return false;
    }
    /** From videocreator.cpp - xine_artsplugin
    Copyright (C) 2002 Simon MacMullen
    Copyright (C) 2003 Ewald Snel <ewald@rambo.its.tudelft.nl>
     * */
//     TQPixmap pix( createThumbnail( &frame, width, height ) );
#ifdef STRIPS_SUPPORT
    TQPainter painter( &pix );
    TQPixmap sprocket;

    if (pix.height() < 60)
        sprocket = TQPixmap(locate( "data", "videopreview/sprocket-small.png" ));
    else if (pix.height() < 90)
        sprocket = TQPixmap(locate( "data", "videopreview/sprocket-medium.png" ));
    else
        sprocket = TQPixmap(locate( "data", "videopreview/sprocket-large.png" ));

    for (int y = 0; y < pix.height() + sprocket.height(); y += sprocket.height()) {
        painter.drawPixmap( 0, y, sprocket );
    }

    // End of xine-artsplugin code
#endif
    img = pix.convertToImage();

    if(tmpdir) tmpdir->unlink();
    return true;
}

TQPixmap VideoPreview::getFrame(const TQString &path, int flags)
{
    TQStringList args;
    kdDebug() << "videopreview: using flags " << flags << endl;
#define START ((fileinfo.seconds*15)/100)
#define END ((fileinfo.seconds*70)/100)
    mplayerprocess->setCommunication( 0 );
    mplayerprocess->clearArguments();
    args.clear();
    args << playerBin << path;
    if(fileinfo.towidth>fileinfo.toheight) fileinfo.toheight=-2; else fileinfo.towidth=-2;
//     switch( flags ){
//         case random
//     }
    if( flags & framerandom )
    {
        kdDebug() << "videopreview: framerandom\n";
        unsigned long start=(unsigned long)(START+(rand->getDouble() * (END - START) ) );
        args << "-ss" << TQString::number( start )
                << "-frames" << "4";
    } else if (flags & frameend )
    {
        kdDebug() << "videopreview: frameend\n";
        args << "-ss" << TQString::number( fileinfo.seconds - 10 )
                << "-frames" << "4";
    } else if (flags & framestart)
    {
        kdDebug() << "videopreview: framestart\n";
        if(!fileinfo.fps) fileinfo.fps=25; // if we've not autodetected a fps rate, let's assume 25fps.. even if it's wrong it shouldn't hurt.
        // If we can't skip to a random frame, let's try playing 10 seconds.
        args << "-frames" << TQString::number( fileinfo.fps*10 );
    }
    args << "-nocache" << "-idx" /*@TODO check if it's too slow..*/ << "-ao" << "null"/*"-nosound" << */<< "-speed" << "99"  /*<< "-sstep" << "5"*/
            << "-vo" << TQString("jpeg:outdir=%1").arg(tmpdir->name() ) << "-vf" << TQString("scale=%1:%2").arg(fileinfo.towidth).arg(fileinfo.toheight);
    args+=customargs;
    kdDebug() << "videopreview: Starting MPlayer with" <<  args.join( " ") << endl;
//     return false;
    mplayerprocess->setArguments( args);
    mplayerprocess->start();
    while (mplayerprocess->isRunning() ) usleep (10);
    if (tmpdir->qDir()->entryList( "*.jpg" ).isEmpty() ) return 0;

    TQString lastframe=tmpdir->qDir()->entryList( "*.jpg" ).last();
    kdDebug() << "videopreview: LastFrame==" << lastframe << endl;
    TQPixmap retpix(tmpdir->name().append( lastframe ));
    return retpix;
}

ThumbCreator::Flags VideoPreview::flags() const
{
    return (Flags)(DrawFrame);
}


uint VideoPreview::imageVariance(TQImage image )
{
    uint delta=0;
    uint avg=0;
    uint bytes=image.numBytes();
    uint STEPS=bytes/2;
    uchar pivot[STEPS];
    kdDebug() << "Using " << STEPS << " steps\n";
    uchar *bits=image.bits();
    // First pass: get pivots and taking average
    for( uint i=0; i<STEPS ; i++ ){
        pivot[i]=bits[i*(bytes/STEPS)];
        avg+=pivot[i];
    }
    avg=avg/STEPS;
    // Second Step: calculate delta (average?)
    for (uint i=0; i<STEPS; i++)
    {
        int curdelta=abs(int(avg-pivot[i]));
        delta+=curdelta;
    }
    return delta/STEPS;
}
#include "videopreview.moc"