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260 lines
9.8 KiB
260 lines
9.8 KiB
15 years ago
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/*
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* qimage_wrapper.cpp -- a QT/QImage based producer for MLT
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* Copyright (C) 2006 Visual Media
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* Author: Charles Yates <charles.yates@gmail.com>
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*
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* NB: This module is designed to be functionally equivalent to the
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* gtk2 image loading module so it can be used as replacement.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "qimage_wrapper.h"
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#include <qimage.h>
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#include "config.h"
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#ifdef USE_KDE
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#include <kinstance.h>
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#include <kimageio.h>
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#endif
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#include <cmath>
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extern "C" {
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#include <framework/mlt_pool.h>
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#ifdef USE_KDE
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static KInstance *instance = 0L;
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#endif
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static void qimage_delete( void *data )
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{
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QImage *image = ( QImage * )data;
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delete image;
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#ifdef USE_KDE
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if (instance) delete instance;
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instance = 0L;
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#endif
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}
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static void clear_buffered_image( mlt_properties producer_props, uint8_t **current_image, uint8_t **current_alpha )
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{
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mlt_events_block( producer_props, NULL );
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mlt_properties_set_data( producer_props, "_qimage_image", NULL, 0, NULL, NULL );
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mlt_properties_set_data( producer_props, "_qimage_alpha", NULL, 0, NULL, NULL );
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*current_image = NULL;
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*current_alpha = NULL;
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mlt_events_unblock( producer_props, NULL );
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}
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static void assign_buffered_image( mlt_properties producer_props, uint8_t *current_image, uint8_t *current_alpha, int width, int height )
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{
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int use_cache = mlt_properties_get_int( producer_props, "cache" );
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mlt_destructor destructor = use_cache ? NULL : mlt_pool_release;
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mlt_events_block( producer_props, NULL );
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mlt_properties_set_data( producer_props, "_qimage_image", current_image, 0, destructor, NULL );
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mlt_properties_set_data( producer_props, "_qimage_alpha", current_alpha, 0, destructor, NULL );
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mlt_properties_set_int( producer_props, "_qimage_width", width );
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mlt_properties_set_int( producer_props, "_qimage_height", height );
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mlt_events_unblock( producer_props, NULL );
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}
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void init_qimage()
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{
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#ifdef USE_KDE
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if (!instance) {
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instance = new KInstance("qimage_prod");
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KImageIO::registerFormats();
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}
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#endif
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}
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void refresh_qimage( mlt_frame frame, int width, int height )
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{
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// Obtain a previous assigned qimage (if it exists)
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QImage *qimage = ( QImage * )mlt_properties_get_data( MLT_FRAME_PROPERTIES( frame ), "qimage", NULL );
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// Obtain properties of frame
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mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
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// Obtain the producer for this frame
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producer_qimage self = ( producer_qimage )mlt_properties_get_data( properties, "producer_qimage", NULL );
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// Obtain the producer
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mlt_producer producer = &self->parent;
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// Obtain properties of producer
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mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
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// Obtain the cache flag and structure
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int use_cache = mlt_properties_get_int( producer_props, "cache" );
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mlt_properties cache = ( mlt_properties )mlt_properties_get_data( producer_props, "_cache", NULL );
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int update_cache = 0;
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// Retrieve current info if available
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uint8_t *current_image = ( uint8_t * )mlt_properties_get_data( producer_props, "_qimage_image", NULL );
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uint8_t *current_alpha = ( uint8_t * )mlt_properties_get_data( producer_props, "_qimage_alpha", NULL );
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int current_width = mlt_properties_get_int( producer_props, "_qimage_width" );
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int current_height = mlt_properties_get_int( producer_props, "_qimage_height" );
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// Get the time to live for each frame
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double ttl = mlt_properties_get_int( producer_props, "ttl" );
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// Get the original position of this frame
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mlt_position position = mlt_properties_get_position( properties, "qimage_position" );
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// Image index
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int image_idx = ( int )floor( ( double )position / ttl ) % self->count;
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// Key for the cache
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char image_key[ 10 ];
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sprintf( image_key, "%d", image_idx );
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// Check if the frame is already loaded
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if ( use_cache )
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{
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if ( cache == NULL )
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{
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cache = mlt_properties_new( );
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mlt_properties_set_data( producer_props, "_cache", cache, 0, ( mlt_destructor )mlt_properties_close, NULL );
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}
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mlt_frame cached = ( mlt_frame )mlt_properties_get_data( cache, image_key, NULL );
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if ( cached )
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{
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self->image_idx = image_idx;
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mlt_properties cached_props = MLT_FRAME_PROPERTIES( cached );
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current_width = mlt_properties_get_int( cached_props, "width" );
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current_height = mlt_properties_get_int( cached_props, "height" );
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mlt_properties_set_int( producer_props, "_real_width", mlt_properties_get_int( cached_props, "real_width" ) );
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mlt_properties_set_int( producer_props, "_real_height", mlt_properties_get_int( cached_props, "real_height" ) );
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current_image = ( uint8_t * )mlt_properties_get_data( cached_props, "image", NULL );
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current_alpha = ( uint8_t * )mlt_properties_get_data( cached_props, "alpha", NULL );
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if ( width != 0 && ( width != current_width || height != current_height ) )
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current_image = NULL;
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assign_buffered_image( producer_props, current_image, current_alpha, current_width, current_height );
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}
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}
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// optimization for subsequent iterations on single picture
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if ( width != 0 && current_image != NULL && image_idx == self->image_idx )
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{
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if ( width != current_width || height != current_height )
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{
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qimage = ( QImage * )mlt_properties_get_data( producer_props, "_qimage", NULL );
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clear_buffered_image( producer_props, ¤t_image, ¤t_alpha );
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}
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}
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else if ( qimage == NULL && ( current_image == NULL || image_idx != self->image_idx ) )
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{
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clear_buffered_image( producer_props, ¤t_image, ¤t_alpha );
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self->image_idx = image_idx;
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qimage = new QImage( mlt_properties_get_value( self->filenames, image_idx ) );
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if ( !qimage->isNull( ) )
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{
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QImage *frame_copy = new QImage( *qimage );
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// Store the width/height of the pixbuf
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current_width = qimage->width( );
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current_height = qimage->height( );
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// Register qimage for destruction and reuse
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mlt_events_block( producer_props, NULL );
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mlt_properties_set_data( producer_props, "_qimage", qimage, 0, ( mlt_destructor )qimage_delete, NULL );
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mlt_properties_set_data( MLT_FRAME_PROPERTIES( frame ), "qimage", frame_copy, 0, ( mlt_destructor )qimage_delete, NULL );
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mlt_properties_set_int( producer_props, "_real_width", current_width );
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mlt_properties_set_int( producer_props, "_real_height", current_height );
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mlt_events_unblock( producer_props, NULL );
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}
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else
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{
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delete qimage;
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qimage = NULL;
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}
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}
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// If we have a pixbuf and this request specifies a valid dimension and we haven't already got a cached version...
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if ( qimage && width > 0 && current_image == NULL )
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{
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char *interps = mlt_properties_get( properties, "rescale.interp" );
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int interp = 0;
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// QImage has two scaling modes - we'll toggle between them here
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if ( strcmp( interps, "tiles" ) == 0 )
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interp = 1;
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else if ( strcmp( interps, "hyper" ) == 0 )
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interp = 1;
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// Note - the original qimage is already safe and ready for destruction
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QImage scaled = interp == 0 ? qimage->scale( width, height, QImage::ScaleFree ) : qimage->smoothScale( width, height, QImage::ScaleFree );
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QImage temp = scaled.convertDepth( 32 );
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// Store width and height
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current_width = width;
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current_height = height;
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// Allocate/define image
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current_image = ( uint8_t * )mlt_pool_alloc( width * ( height + 1 ) * 2 );
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// Allocate the alpha mask
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current_alpha = ( uint8_t * )mlt_pool_alloc( current_width * current_height );
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// Convert the image
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if ( QImage::systemByteOrder( ) == QImage::BigEndian )
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mlt_convert_argb_to_yuv422( temp.bits( ), current_width, current_height, temp.bytesPerLine( ), current_image, current_alpha );
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else
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mlt_convert_bgr24a_to_yuv422( temp.bits( ), current_width, current_height, temp.bytesPerLine( ), current_image, current_alpha );
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assign_buffered_image( producer_props, current_image, current_alpha, current_width, current_height );
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// Ensure we update the cache when we need to
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update_cache = use_cache;
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}
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// Set width/height of frame
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mlt_properties_set_int( properties, "width", current_width );
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mlt_properties_set_int( properties, "height", current_height );
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mlt_properties_set_int( properties, "real_width", mlt_properties_get_int( producer_props, "_real_width" ) );
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mlt_properties_set_int( properties, "real_height", mlt_properties_get_int( producer_props, "_real_height" ) );
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// pass the image data without destructor
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mlt_properties_set_data( properties, "image", current_image, current_width * ( current_height + 1 ) * 2, NULL, NULL );
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mlt_properties_set_data( properties, "alpha", current_alpha, current_width * current_height, NULL, NULL );
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if ( update_cache )
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{
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mlt_frame cached = mlt_frame_init( );
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mlt_properties cached_props = MLT_FRAME_PROPERTIES( cached );
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mlt_properties_set_int( cached_props, "width", current_width );
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mlt_properties_set_int( cached_props, "height", current_height );
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mlt_properties_set_int( cached_props, "real_width", mlt_properties_get_int( producer_props, "_real_width" ) );
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mlt_properties_set_int( cached_props, "real_height", mlt_properties_get_int( producer_props, "_real_height" ) );
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mlt_properties_set_data( cached_props, "image", current_image, current_width * ( current_height + 1 ) * 2, mlt_pool_release, NULL );
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mlt_properties_set_data( cached_props, "alpha", current_alpha, current_width * current_height, mlt_pool_release, NULL );
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mlt_properties_set_data( cache, image_key, cached, 0, ( mlt_destructor )mlt_frame_close, NULL );
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}
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}
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}
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