research.m1stereo.tv/gitweb/ - melted/blob - src/modules/qimage/qimage_wrapper.cpp

   1 /*
   2  * qimage_wrapper.cpp -- a QT/QImage based producer for MLT
   3  * Copyright (C) 2006 Visual Media
   4  * Author: Charles Yates <charles.yates@gmail.com>
   5  *
   6  * NB: This module is designed to be functionally equivalent to the
   7  * gtk2 image loading module so it can be used as replacement.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22  */
  23
  24 #include "qimage_wrapper.h"
  25
  26 #ifdef USE_QT3
  27 #include <qimage.h>
  28
  29 #ifdef USE_KDE
  30 #include <kinstance.h>
  31 #include <kimageio.h>
  32 #endif
  33
  34 #endif
  35
  36
  37 #ifdef USE_QT4
  38 #include <QtGui/QImage>
  39 #include <QtCore/QSysInfo>
  40 #endif
  41
  42
  43 #include <cmath>
  44
  45 extern "C" {
  46
  47 #include <framework/mlt_pool.h>
  48
  49 #ifdef USE_KDE
  50 static KInstance *instance = 0L;
  51 #endif
  52
  53 static void qimage_delete( void *data )
  54 {
  55         QImage *image = ( QImage * )data;
  56         delete image;
  57 #ifdef USE_KDE
  58         if (instance) delete instance;
  59         instance = 0L;
  60 #endif
  61 }
  62
  63 static void clear_buffered_image( mlt_properties producer_props, uint8_t **current_image, uint8_t **current_alpha )
  64 {
  65         mlt_events_block( producer_props, NULL );
  66         mlt_properties_set_data( producer_props, "_qimage_image", NULL, 0, NULL, NULL );
  67         mlt_properties_set_data( producer_props, "_qimage_alpha", NULL, 0, NULL, NULL );
  68         *current_image = NULL;
  69         *current_alpha = NULL;
  70         mlt_events_unblock( producer_props, NULL );
  71 }
  72
  73 static void assign_buffered_image( mlt_properties producer_props, uint8_t *current_image, uint8_t *current_alpha, int width, int height )
  74 {
  75         int use_cache = mlt_properties_get_int( producer_props, "cache" );
  76         mlt_destructor destructor = use_cache ? NULL : mlt_pool_release;
  77         mlt_events_block( producer_props, NULL );
  78         mlt_properties_set_data( producer_props, "_qimage_image", current_image, 0, destructor, NULL );
  79         mlt_properties_set_data( producer_props, "_qimage_alpha", current_alpha, 0, destructor, NULL );
  80         mlt_properties_set_int( producer_props, "_qimage_width", width );
  81         mlt_properties_set_int( producer_props, "_qimage_height", height );
  82         mlt_events_unblock( producer_props, NULL );
  83 }
  84
  85 #ifdef USE_KDE
  86 void init_qimage()
  87 {
  88         if (!instance) {
  89             instance = new KInstance("qimage_prod");
  90             KImageIO::registerFormats();
  91         }
  92 }
  93 #endif
  94
  95 void refresh_qimage( mlt_frame frame, int width, int height )
  96 {
  97         // Obtain a previous assigned qimage (if it exists)
  98         QImage *qimage = ( QImage * )mlt_properties_get_data( MLT_FRAME_PROPERTIES( frame ), "qimage", NULL );
  99
 100         // Obtain properties of frame
 101         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 102
 103         // Obtain the producer for this frame
 104         producer_qimage self = ( producer_qimage )mlt_properties_get_data( properties, "producer_qimage", NULL );
 105
 106         // Obtain the producer
 107         mlt_producer producer = &self->parent;
 108
 109         // Obtain properties of producer
 110         mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
 111
 112         // Obtain the cache flag and structure
 113         int use_cache = mlt_properties_get_int( producer_props, "cache" );
 114         mlt_properties cache = ( mlt_properties )mlt_properties_get_data( producer_props, "_cache", NULL );
 115         int update_cache = 0;
 116
 117         // Retrieve current info if available
 118         uint8_t *current_image = ( uint8_t * )mlt_properties_get_data( producer_props, "_qimage_image", NULL );
 119         uint8_t *current_alpha = ( uint8_t * )mlt_properties_get_data( producer_props, "_qimage_alpha", NULL );
 120         int current_width = mlt_properties_get_int( producer_props, "_qimage_width" );
 121         int current_height = mlt_properties_get_int( producer_props, "_qimage_height" );
 122
 123         // Get the time to live for each frame
 124         double ttl = mlt_properties_get_int( producer_props, "ttl" );
 125
 126         // Get the original position of this frame
 127         mlt_position position = mlt_properties_get_position( properties, "qimage_position" );
 128         position += mlt_producer_get_in( producer );
 129
 130         // Image index
 131         int image_idx = ( int )floor( ( double )position / ttl ) % self->count;
 132
 133         // Key for the cache
 134         char image_key[ 10 ];
 135         sprintf( image_key, "%d", image_idx );
 136
 137         // Check if the frame is already loaded
 138         if ( use_cache )
 139         {
 140                 if ( cache == NULL )
 141                 {
 142                         cache = mlt_properties_new( );
 143                         mlt_properties_set_data( producer_props, "_cache", cache, 0, ( mlt_destructor )mlt_properties_close, NULL );
 144                 }
 145
 146                 mlt_frame cached = ( mlt_frame )mlt_properties_get_data( cache, image_key, NULL );
 147
 148                 if ( cached )
 149                 {
 150                         self->image_idx = image_idx;
 151                         mlt_properties cached_props = MLT_FRAME_PROPERTIES( cached );
 152                         current_width = mlt_properties_get_int( cached_props, "width" );
 153                         current_height = mlt_properties_get_int( cached_props, "height" );
 154                         mlt_properties_set_int( producer_props, "_real_width", mlt_properties_get_int( cached_props, "real_width" ) );
 155                         mlt_properties_set_int( producer_props, "_real_height", mlt_properties_get_int( cached_props, "real_height" ) );
 156                         current_image = ( uint8_t * )mlt_properties_get_data( cached_props, "image", NULL );
 157                         current_alpha = ( uint8_t * )mlt_properties_get_data( cached_props, "alpha", NULL );
 158
 159                         if ( width != 0 && ( width != current_width || height != current_height ) )
 160                                 current_image = NULL;
 161
 162                         assign_buffered_image( producer_props, current_image, current_alpha, current_width, current_height );
 163                 }
 164         }
 165
 166     // optimization for subsequent iterations on single picture
 167         if ( width != 0 && current_image != NULL && image_idx == self->image_idx )
 168         {
 169                 if ( width != current_width || height != current_height )
 170                 {
 171                         qimage = ( QImage * )mlt_properties_get_data( producer_props, "_qimage", NULL );
 172                         clear_buffered_image( producer_props, &current_image, &current_alpha );
 173                 }
 174         }
 175         else if ( qimage == NULL && ( current_image == NULL || image_idx != self->image_idx ) )
 176         {
 177                 clear_buffered_image( producer_props, &current_image, &current_alpha );
 178
 179                 self->image_idx = image_idx;
 180                 qimage = new QImage( mlt_properties_get_value( self->filenames, image_idx ) );
 181
 182                 if ( !qimage->isNull( ) )
 183                 {
 184                         QImage *frame_copy = new QImage( *qimage );
 185
 186                         // Store the width/height of the pixbuf
 187                         current_width = qimage->width( );
 188                         current_height = qimage->height( );
 189
 190                         // Register qimage for destruction and reuse
 191                         mlt_events_block( producer_props, NULL );
 192                         mlt_properties_set_data( producer_props, "_qimage", qimage, 0, ( mlt_destructor )qimage_delete, NULL );
 193                         mlt_properties_set_data( MLT_FRAME_PROPERTIES( frame ), "qimage", frame_copy, 0, ( mlt_destructor )qimage_delete, NULL );
 194                         mlt_properties_set_int( producer_props, "_real_width", current_width );
 195                         mlt_properties_set_int( producer_props, "_real_height", current_height );
 196                         mlt_events_unblock( producer_props, NULL );
 197                 }
 198                 else
 199                 {
 200                         delete qimage;
 201                         qimage = NULL;
 202                 }
 203         }
 204
 205         // If we have a pixbuf and this request specifies a valid dimension and we haven't already got a cached version...
 206         if ( qimage && width > 0 && current_image == NULL )
 207         {
 208                 char *interps = mlt_properties_get( properties, "rescale.interp" );
 209                 int interp = 0;
 210
 211                 // QImage has two scaling modes - we'll toggle between them here
 212                 if ( strcmp( interps, "tiles" ) == 0 )
 213                         interp = 1;
 214                 else if ( strcmp( interps, "hyper" ) == 0 )
 215                         interp = 1;
 216
 217 #ifdef USE_QT4
 218                 // Note - the original qimage is already safe and ready for destruction
 219                 QImage scaled = interp == 0 ? qimage->scaled( QSize( width, height)) : qimage->scaled( QSize(width, height), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
 220                 QImage temp = scaled.convertToFormat(QImage::Format_ARGB32);
 221 #endif
 222
 223 #ifdef USE_QT3
 224                 // Note - the original qimage is already safe and ready for destruction
 225                 QImage scaled = interp == 0 ? qimage->scale( width, height, QImage::ScaleFree ) : qimage->smoothScale( width, height, QImage::ScaleFree );
 226                 QImage temp = scaled.convertDepth( 32 );
 227 #endif
 228
 229                 // Store width and height
 230                 current_width = width;
 231                 current_height = height;
 232
 233                 // Allocate/define image
 234                 current_image = ( uint8_t * )mlt_pool_alloc( width * ( height + 1 ) * 2 );
 235
 236                 // Allocate the alpha mask
 237                 current_alpha = ( uint8_t * )mlt_pool_alloc( current_width * current_height );
 238
 239 #ifdef USE_QT4
 240                 if ( QSysInfo::ByteOrder == QSysInfo::BigEndian )
 241                         mlt_convert_argb_to_yuv422( temp.bits( ), current_width, current_height, temp.bytesPerLine( ), current_image, current_alpha );
 242                 else
 243                         mlt_convert_bgr24a_to_yuv422( temp.bits( ), current_width, current_height, temp.bytesPerLine( ), current_image, current_alpha );
 244 #endif
 245
 246 #ifdef USE_QT3
 247                 // Convert the image
 248                 if ( QImage::systemByteOrder( ) == QImage::BigEndian )
 249                         mlt_convert_argb_to_yuv422( temp.bits( ), current_width, current_height, temp.bytesPerLine( ), current_image, current_alpha );
 250                 else
 251                         mlt_convert_bgr24a_to_yuv422( temp.bits( ), current_width, current_height, temp.bytesPerLine( ), current_image, current_alpha );
 252 #endif
 253                 assign_buffered_image( producer_props, current_image, current_alpha, current_width, current_height );
 254
 255                 // Ensure we update the cache when we need to
 256                 update_cache = use_cache;
 257         }
 258
 259         // Set width/height of frame
 260         mlt_properties_set_int( properties, "width", current_width );
 261         mlt_properties_set_int( properties, "height", current_height );
 262         mlt_properties_set_int( properties, "real_width", mlt_properties_get_int( producer_props, "_real_width" ) );
 263         mlt_properties_set_int( properties, "real_height", mlt_properties_get_int( producer_props, "_real_height" ) );
 264
 265         // pass the image data without destructor
 266         mlt_properties_set_data( properties, "image", current_image, current_width * ( current_height + 1 ) * 2, NULL, NULL );
 267         mlt_properties_set_data( properties, "alpha", current_alpha, current_width * current_height, NULL, NULL );
 268
 269         if ( update_cache )
 270         {
 271                 mlt_frame cached = mlt_frame_init( MLT_PRODUCER_SERVICE( producer ) );
 272                 mlt_properties cached_props = MLT_FRAME_PROPERTIES( cached );
 273                 mlt_properties_set_int( cached_props, "width", current_width );
 274                 mlt_properties_set_int( cached_props, "height", current_height );
 275                 mlt_properties_set_int( cached_props, "real_width", mlt_properties_get_int( producer_props, "_real_width" ) );
 276                 mlt_properties_set_int( cached_props, "real_height", mlt_properties_get_int( producer_props, "_real_height" ) );
 277                 mlt_properties_set_data( cached_props, "image", current_image, current_width * ( current_height + 1 ) * 2, mlt_pool_release, NULL );
 278                 mlt_properties_set_data( cached_props, "alpha", current_alpha, current_width * current_height, mlt_pool_release, NULL );
 279                 mlt_properties_set_data( cache, image_key, cached, 0, ( mlt_destructor )mlt_frame_close, NULL );
 280         }
 281 }
 282
 283 }
 284