c++ > delphi

[kaka77]

hallo,

ich möchte in delphi mit libvlc eine art videofilter schreiben (sättigung usw). dazu muss ich irgendwie an die video daten aus dem buffer kommen...

ich hab hier einen code, der genau dass macht nur in c++, da ich nicht soviel ahnung davon hab wäre es nett, wenn mir jemand bei der übersetzung helfen könnte.

Code:

/*
 * Copyright (c) 2009 Ludovic Fauvet
 *
 * Author: Ludovic Fauvet <[e-mail]>
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#include "MainWindow.h"

MainWindow::MainWindow( QWidget* parent )
        : QMainWindow( parent )
{
    // We do not support video resizing
    setFixedSize( 500, 450 );

    // This is the widget where the video will be drawn
    // The advantage of a QLabel over a QWidget is that
    // we can easily push a QPixmap into.
    video = new QLabel( this );
    video->setSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );

    playButton = new QPushButton( "Play" );

    // The container will contain the main layout
    // Video + Play button
    QWidget* container = new QWidget( this );
    setCentralWidget( container );

    // Vertical Layout
    layout = new QVBoxLayout;
    layout->addWidget( video );
    layout->addWidget( playButton );
    container->setLayout( layout );

    // Used for printing libvlc exceptions (if any)
    errorHandler = new QErrorMessage( this );

    // Connecting the play button to the play slot
    connect( playButton, SIGNAL( clicked() ), this, SLOT( play() ) );

    // Forget that for the moment ;-)
    connect( this, SIGNAL( frameReady( struct ctx* ) ),
             this, SLOT( processNewFrame( struct ctx* ) ) );


    // Finally init libvlc
    initVLC();
}

void MainWindow::initVLC()
{
    // List of parameters used to initialize libvlc.
    // These arguments are same as those you can pass
    // the the VLC command line.
    char const* vlc_argv[] =
    {
        "--verbose", "3",
        // Edit this line if libvlc can't locate your plugins directory
        //"--plugin-path", "/path/to/vlc",
    };
    int vlc_argc = sizeof(vlc_argv) / sizeof(*vlc_argv);

    // Initialize the libvlc exception mechanism
    libvlc_exception_init( &m_ex );
    // Create a libvlc instance
    m_vlcInstance = libvlc_new( vlc_argc, vlc_argv, &m_ex );
    // This for catching and printing exceptions
    // raised by libvlc
    catchException();
    // Create the mediaplayer used to play a media
    m_vlcMediaplayer = libvlc_media_player_new( m_vlcInstance, &m_ex );
    // Re-checking for exceptions
    catchException();

    // We're done with the initialization!
}

void MainWindow::play()
{
    // This method is called, when the play button is
    // clicked.

    if ( mrl.isEmpty() )
    {
        // Show the open dialog
        mrl = QFileDialog::getOpenFileName( this,
                                            "Open a video file",
                                            QDir::home().dirName(),
                                            "Videos (*.avi *.ogg *.mkv "
                                            "*.mpg *.mpeg *.wmv)" );
        if ( mrl.isEmpty() ) return;

        // Create a new media from the Media Resource Locator
        m_vlcMedia = libvlc_media_new( m_vlcInstance, mrl.toAscii(), &m_ex );
        // Catching exception
        catchException();

        // We now need a struct for storing the video buffer
        // and a mutex to protect it.
        // The structure will be given as an arguments for the
        // lock/unlock callbacks.
        struct ctx* context;
        // Allocating the space for the structure
        context = ( struct ctx* )malloc( sizeof( *context ) );
        // Allocating the video buffer
        context->pixels = ( uchar* )malloc( ( sizeof( *( context->pixels ) ) * VIDEO_WIDTH * VIDEO_HEIGHT ) * 4 );
        // Allocating the mutex
        context->mutex = new QMutex();
        context->mainWindow = this;

        // Creating some char[] to store the media options
        char clock[64], cunlock[64], cdata[64];
        char width[32], height[32], chroma[32], pitch[32];

        // Preparing the options for the media
        // The clock and cunlock contain a pointer to the associated
        // static method (note the use of %lld).
        //
        // In that specific case we can't use Qt:
        // The sprintf method of the QString does not support
        // length modifiers (like %lld).
        sprintf( clock,   ":vmem-lock=%lld",   (long long int)(intptr_t)lock    );
        sprintf( cunlock, ":vmem-unlock=%lld", (long long int)(intptr_t)unlock  );
        sprintf( cdata,   ":vmem-data=%lld",   (long long int)(intptr_t)context );
        sprintf( width,   ":vmem-width=%i",    VIDEO_WIDTH                      );
        sprintf( height,  ":vmem-height=%i",   VIDEO_HEIGHT                     );
        sprintf( chroma,  ":vmem-chroma=%s",   "RV32"                           );
        sprintf( pitch,   ":vmem-pitch=%i",    VIDEO_WIDTH * 4                  );

        // List of options
        // This part can be easily replaced by a QStringList
        // instead of a C array.
        char const* media_options[] =
        {
            ":vout=vmem",
            width, height,
            chroma, pitch,
            clock, cunlock,
            cdata
        };
        int media_options_size = sizeof( media_options )
                                 / sizeof( *media_options );

        // Adding each option from the array to the media
        for ( int i = 0; i < media_options_size; ++i )
        {
            libvlc_media_add_option( m_vlcMedia, media_options[i], &m_ex );
            catchException();
        }

        // Put the media into the mediaplayer
        libvlc_media_player_set_media( m_vlcMediaplayer, m_vlcMedia, &m_ex );
        catchException();
    }

    // Finally, start the playback.
    libvlc_media_player_play( m_vlcMediaplayer, &m_ex );
    catchException();
}

void MainWindow::lock( struct ctx* ctx, void** pp_ret )
{
    // Lock the buffer (to avoid concurrent access and data corruption)
    ctx->mutex->lock();
    // Tell libvlc to write the next frame into our pre-allocated buffer
    *pp_ret = ctx->pixels;
}

void MainWindow::unlock( struct ctx* ctx )
{
    // As we are in a static method we don't have an instance
    // of the MainWindow here. Fortunately we created a copy
    // of our instance pointer into the ctx structure,
    // do you remember ?
    ctx->mainWindow->emit frameReady( ctx );
    // That way we are able to emit a signal containing our
    // new video frame !
}

void MainWindow::processNewFrame( struct ctx* ctx )
{
    // WARNING:
    // This part of the code is extremely slow and inefficient
    // (but sufficient for our example).

    // The bottleneck starts here ;)

    // Conversion of the frame from our pixel buffer to a QImage
    QImage px( ctx->pixels, VIDEO_WIDTH, VIDEO_HEIGHT, QImage::Format_RGB32 );
    // Then we're creating a new QPixmap from our QImage
    QPixmap pix = QPixmap::fromImage( px );

    // Set the current frame into the video container
    video->setPixmap( pix );

    // Releasing the mutex for the upcoming frame.
    ctx->mutex->unlock();
}

bool MainWindow::catchException()
{
    if ( libvlc_exception_raised( &m_ex ) )
    {
        /* For VLC <= 1.0.x */
        errorHandler->showMessage( libvlc_exception_get_message( &m_ex ) );

        /* For VLC >= 1.1.x */
        //errorHandler->showMessage( libvlc_errmsg() );

        libvlc_exception_clear( &m_ex );
        return true;
    }
    return false;
}

hier auch nochmal der link zum ganzen projekt

vielleicht kennt sich ja jemand aus und hat lust zu helfen

vielen dank schonmal fürs durchlesen;)