page_export_stills.cc

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/*
* page_export_stills.cc Notebook Firewire/AVI/Still Frame Export Page Object
* Copyright (C) 2001-2007 Dan Dennedy <dan@dennedy.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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <vector>
#include <iostream>
using std::cerr;
using std::endl;

#include <gtk/gtk.h>
#include <stdio.h>
#include <stdlib.h>

#include "page_export_stills.h"
#include "preferences.h"
#include "kino_common.h"
#include "frame.h"
#include "page_editor.h"
#include "message.h"

ExportStills::ExportStills( PageExport *_exportPage, KinoCommon *_common ) :
        Export( _exportPage, _common )
{
    cerr << "> Creating ExportStills Page" << endl;

    /* Get a pointer to the controls of this page */
    qualityScale
    = GTK_RANGE( lookup_widget( common->getWidget(), "hscale_export_stills" ) );

    fileEntry
    = GTK_ENTRY( lookup_widget( common->getWidget(), "entry_export_stills_file" ) );
}

ExportStills::~ExportStills()
{
    cerr << "> Destroying ExportStills Page" << endl;
}

enum export_result
ExportStills::doExport( PlayList * playlist, int begin, int end, int every,
                        bool preview )
{
    static unsigned char pixels[ FRAME_MAX_WIDTH * FRAME_MAX_HEIGHT * 4 ];
    GdkPixbuf *image = NULL;
    gchar *file = NULL;
    gchar *filename = NULL;
    gchar *extension = NULL;
    int i = -1;
    GError *gerror = NULL;
    char quality[ 8 ] = "75";
    int extractOption;
    bool isResample;

    file = g_strdup( gtk_entry_get_text( fileEntry ) );

    /* Check for a valid filename */
    if ( !strcmp( file, "" ) )
    {
        modal_message( _( "You must enter a filename." ) );
        g_free( file );
        return EXPORT_RESULT_FAILURE;
    }

    /* Take care of the quality parameter */
    GtkAdjustment * adjust = gtk_range_get_adjustment( qualityScale );
    if ( adjust )
        snprintf( quality, 8, "%d", ( int ) adjust->value );

    /* make sure a file extension is supplied */
    char *tmp = strrchr( file, '.' );
    if ( tmp == NULL )
    {
        modal_message( _( "You must enter a filename with an extension" ) );
        g_free( file );
        return EXPORT_RESULT_FAILURE;
    }
    else
    {
        extension = g_strdup( tmp );
        tmp[0] = '\0';
    }

    /* get the frame extraction method */
    GtkWidget *widget = gtk_option_menu_get_menu( GTK_OPTION_MENU( lookup_widget( common->getWidget(),
        "optionmenu_export_stills_extract" ) ) );
    GtkWidget *active_item = gtk_menu_get_active( GTK_MENU( widget ) );
    extractOption = g_list_index( GTK_MENU_SHELL( widget )->children, active_item );
        
    widget = lookup_widget( common->getWidget(), "checkbutton_export_stills_resample" );
    isResample = gtk_toggle_button_get_active( GTK_TOGGLE_BUTTON( widget ) );
        
    /* Iterate over all frames in selection */
    Frame &frame = *GetFramePool( ) ->GetFrame( );
    frame.decoder->quality = DV_QUALITY_BEST;

    for ( i = begin; i <= end && exportPage->isExporting; i += every )
    {

        /* Call innerLoopUpdate */
        innerLoopUpdate( i, begin, end, every );

        // Extract pixel data
        playlist->GetFrame( i, frame );
        frame.ExtractRGB( pixels );
        switch ( extractOption )
        {
            case 1:
                frame.Deinterlace( ( uint8_t* ) pixels, ( uint8_t* ) pixels, frame.GetWidth() * 3, frame.GetHeight() );
                break;
            case 2:
                frame.GetLowerField( pixels, 3 );
                break;
            case 3:
                frame.GetUpperField( pixels, 3 );
                break;
            default:
                break;
        }

        // Get gdk-pixbuf
        image = gdk_pixbuf_new_from_data( pixels, GDK_COLORSPACE_RGB, FALSE, 8,
                                          frame.GetWidth(), frame.GetHeight(), frame.GetWidth() * 3, NULL, NULL );

        // Adjust pixel aspect
        if ( isResample )
        {
            int width = frame.GetWidth();
            if ( frame.IsWide() )
                width = frame.IsPAL() ? 1024 : 854;
            AspectRatioCalculator calc( width, frame.GetHeight(),
                                    frame.GetWidth(), frame.GetHeight(),
                                    frame.IsPAL(), frame.IsWide() );
            GdkPixbuf *scaled = gdk_pixbuf_scale_simple( image, calc.width, calc.height, GDK_INTERP_HYPER );
            g_object_unref( image );
            image = scaled;
        }
        
        // save to image
        filename = g_strdup_printf( "%s_%06i%s", file, i + 1, extension );
        if ( strncasecmp( extension + 1, "png", 8 ) == 0 )
            gdk_pixbuf_save( image, filename, "png", &gerror, NULL );
        else
            gdk_pixbuf_save( image, filename, "jpeg", &gerror, "quality", quality, NULL );

        if ( gerror != NULL )
        {
            modal_message( gerror->message );
            g_error_free( gerror );
        }
        g_object_unref( image );
        g_free( filename );
    }

    GetFramePool( ) ->DoneWithFrame( &frame );
    
    g_free( file );
    g_free( extension );

    if ( !exportPage->isExporting )
        return EXPORT_RESULT_ABORT;
    else if ( i > end )
        return EXPORT_RESULT_SUCCESS;
    else
        return EXPORT_RESULT_FAILURE;
}

extern "C"
{
    void
    on_button_export_stills_file_clicked    (GtkButton       *button,
                                            gpointer         user_data)
    {
        const char *filename = common->getFileToSave( _("Enter a File Name to Save As") );
        gtk_widget_grab_focus( lookup_widget( GTK_WIDGET( button ), "entry_export_stills_file" ) );
        if ( strcmp( filename, "" ) )
            gtk_entry_set_text( GTK_ENTRY( lookup_widget( GTK_WIDGET( button ), "entry_export_stills_file" ) ), filename );
    }
}

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