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 #include <qmutex.h>
  29
  30 #ifdef USE_KDE
  31 #include <kinstance.h>
  32 #include <kimageio.h>
  33 #endif
  34
  35 #endif
  36
  37
  38 #ifdef USE_QT4
  39 #include <QtGui/QImage>
  40 #include <QtCore/QSysInfo>
  41 #include <QtCore/QMutex>
  42 #endif
  43
  44
  45 #include <cmath>
  46
  47 extern "C" {
  48
  49 #include <framework/mlt_pool.h>
  50
  51 #ifdef USE_KDE
  52 static KInstance *instance = 0L;
  53 #endif
  54
  55 static void qimage_delete( void *data )
  56 {
  57         QImage *image = ( QImage * )data;
  58         delete image;
  59         image = NULL;
  60 #ifdef USE_KDE
  61         if (instance) delete instance;
  62         instance = 0L;
  63 #endif
  64 }
  65
  66 QMutex mutex;
  67
  68 #ifdef USE_KDE
  69 void init_qimage()
  70 {
  71         if (!instance) {
  72             instance = new KInstance("qimage_prod");
  73             KImageIO::registerFormats();
  74         }
  75 }
  76 #endif
  77
  78 void refresh_qimage( mlt_frame frame, int width, int height )
  79 {
  80         // Obtain a previous assigned qimage (if it exists)
  81         QImage *qimage = static_cast <QImage *>(mlt_properties_get_data( MLT_FRAME_PROPERTIES( frame ), "qimage", NULL ));
  82
  83         // Obtain properties of frame
  84         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
  85
  86         // Obtain the producer for this frame
  87         producer_qimage self = ( producer_qimage )mlt_properties_get_data( properties, "producer_qimage", NULL );
  88
  89         // Obtain the producer
  90         mlt_producer producer = &self->parent;
  91
  92         // Obtain properties of producer
  93         mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
  94
  95         // Check if user wants us to reload the image
  96         if ( mlt_properties_get_int( producer_props, "force_reload" ) )
  97         {
  98                 qimage = NULL;
  99                 self->current_image = NULL;
 100                 mlt_properties_set_int( producer_props, "force_reload", 0 );
 101         }
 102
 103         // Obtain the cache flag and structure
 104         int use_cache = mlt_properties_get_int( producer_props, "cache" );
 105         mlt_properties cache = ( mlt_properties )mlt_properties_get_data( producer_props, "_cache", NULL );
 106         int update_cache = 0;
 107
 108         // Get the time to live for each frame
 109         double ttl = mlt_properties_get_int( producer_props, "ttl" );
 110
 111         // Get the original position of this frame
 112         mlt_position position = mlt_properties_get_position( properties, "qimage_position" );
 113         position += mlt_producer_get_in( producer );
 114
 115         // Image index
 116         int image_idx = ( int )floor( ( double )position / ttl ) % self->count;
 117
 118         // Key for the cache
 119         char image_key[ 10 ];
 120         sprintf( image_key, "%d", image_idx );
 121
 122         mutex.lock();
 123
 124         // Check if the frame is already loaded
 125         if ( use_cache )
 126         {
 127                 if ( cache == NULL )
 128                 {
 129                         cache = mlt_properties_new( );
 130                         mlt_properties_set_data( producer_props, "_cache", cache, 0, ( mlt_destructor )mlt_properties_close, NULL );
 131                 }
 132
 133                 mlt_frame cached = ( mlt_frame )mlt_properties_get_data( cache, image_key, NULL );
 134
 135                 if ( cached )
 136                 {
 137                         self->image_idx = image_idx;
 138                         mlt_properties cached_props = MLT_FRAME_PROPERTIES( cached );
 139                         self->current_width = mlt_properties_get_int( cached_props, "width" );
 140                         self->current_height = mlt_properties_get_int( cached_props, "height" );
 141                         mlt_properties_set_int( producer_props, "_real_width", mlt_properties_get_int( cached_props, "real_width" ) );
 142                         mlt_properties_set_int( producer_props, "_real_height", mlt_properties_get_int( cached_props, "real_height" ) );
 143                         self->current_image = ( uint8_t * )mlt_properties_get_data( cached_props, "image", NULL );
 144                         self->current_alpha = ( uint8_t * )mlt_properties_get_data( cached_props, "alpha", NULL );
 145
 146                         if ( width != 0 && ( width != self->current_width || height != self->current_height ) )
 147                                 self->current_image = NULL;
 148                 }
 149         }
 150
 151     // optimization for subsequent iterations on single picture
 152         if ( width != 0 && self->current_image != NULL && image_idx == self->image_idx )
 153         {
 154                 if ( width != self->current_width || height != self->current_height )
 155                 {
 156                         qimage = static_cast<QImage *>(mlt_properties_get_data( producer_props, "_qimage", NULL ));
 157                         if ( !use_cache )
 158                         {
 159                                 mlt_pool_release( self->current_image );
 160                                 mlt_pool_release( self->current_alpha );
 161                         }
 162                         self->current_image = NULL;
 163                         self->current_alpha = NULL;
 164                 }
 165         }
 166         else if ( qimage == NULL && ( self->current_image == NULL || image_idx != self->image_idx ) )
 167         {
 168                 if ( !use_cache )
 169                 {
 170                         mlt_pool_release( self->current_image );
 171                         mlt_pool_release( self->current_alpha );
 172                 }
 173                 self->current_image = NULL;
 174                 self->current_alpha = NULL;
 175
 176                 self->image_idx = image_idx;
 177                 qimage = new QImage( mlt_properties_get_value( self->filenames, image_idx ) );
 178
 179                 if ( !qimage->isNull( ) )
 180                 {
 181                         QImage *frame_copy = new QImage( *qimage );
 182
 183                         // Store the width/height of the pixbuf
 184                         self->current_width = qimage->width( );
 185                         self->current_height = qimage->height( );
 186
 187                         // Register qimage for destruction and reuse
 188                         mlt_events_block( producer_props, NULL );
 189                         mlt_properties_set_data( producer_props, "_qimage", qimage, 0, ( mlt_destructor )qimage_delete, NULL );
 190                         mlt_properties_set_data( MLT_FRAME_PROPERTIES( frame ), "qimage", frame_copy, 0, ( mlt_destructor )qimage_delete, NULL );
 191                         mlt_properties_set_int( producer_props, "_real_width", self->current_width );
 192                         mlt_properties_set_int( producer_props, "_real_height", self->current_height );
 193                         mlt_events_unblock( producer_props, NULL );
 194                 }
 195                 else
 196                 {
 197                         delete qimage;
 198                         qimage = NULL;
 199                 }
 200         }
 201
 202         // If we have a pixbuf and this request specifies a valid dimension and we haven't already got a cached version...
 203         if ( qimage && width > 0 && self->current_image == NULL )
 204         {
 205                 char *interps = mlt_properties_get( properties, "rescale.interp" );
 206                 int interp = 0;
 207
 208                 // QImage has two scaling modes - we'll toggle between them here
 209                 if ( strcmp( interps, "tiles" ) == 0 )
 210                         interp = 1;
 211                 else if ( strcmp( interps, "hyper" ) == 0 )
 212                         interp = 1;
 213
 214 #ifdef USE_QT4
 215                 // Note - the original qimage is already safe and ready for destruction
 216                 QImage scaled = interp == 0 ? qimage->scaled( QSize( width, height)) : qimage->scaled( QSize(width, height), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
 217                 QImage temp;
 218                 bool hasAlpha = scaled.hasAlphaChannel();
 219                 if (hasAlpha)
 220                     temp = scaled.convertToFormat(QImage::Format_ARGB32);
 221                 else
 222                     temp = scaled.convertToFormat(QImage::Format_RGB888);
 223 #endif
 224
 225 #ifdef USE_QT3
 226                 // Note - the original qimage is already safe and ready for destruction
 227                 QImage scaled = interp == 0 ? qimage->scale( width, height, QImage::ScaleFree ) : qimage->smoothScale( width, height, QImage::ScaleFree );
 228                 QImage temp = scaled.convertDepth( 32 );
 229                 bool hasAlpha = true;
 230 #endif
 231
 232                 // Store width and height
 233                 self->current_width = width;
 234                 self->current_height = height;
 235
 236                 // Allocate/define image
 237                 self->current_image = ( uint8_t * )mlt_pool_alloc( width * ( height + 1 ) * 2 );
 238
 239
 240                 if (!hasAlpha) {
 241                         mlt_convert_rgb24_to_yuv422( temp.bits(), self->current_width, self->current_height, temp.bytesPerLine(), self->current_image );
 242                 }
 243                 else {
 244                         // Allocate the alpha mask
 245                         self->current_alpha = ( uint8_t * )mlt_pool_alloc( self->current_width * self->current_height );
 246 #ifdef USE_QT4
 247                         if ( QSysInfo::ByteOrder == QSysInfo::BigEndian )
 248                                 mlt_convert_argb_to_yuv422( temp.bits( ), self->current_width, self->current_height, temp.bytesPerLine(), self->current_image, self->current_alpha );
 249                         else
 250                                 mlt_convert_bgr24a_to_yuv422( temp.bits( ), self->current_width, self->current_height, temp.bytesPerLine( ), self->current_image, self->current_alpha );
 251 #endif
 252
 253 #ifdef USE_QT3
 254                         // Convert the image
 255                         if ( QImage::systemByteOrder( ) == QImage::BigEndian )
 256                                 mlt_convert_argb_to_yuv422( temp.bits( ), self->current_width, self->current_height, temp.bytesPerLine( ), self->current_image, self->current_alpha );
 257                         else
 258                                 mlt_convert_bgr24a_to_yuv422( temp.bits( ), self->current_width, self->current_height, temp.bytesPerLine( ), self->current_image, self->current_alpha );
 259 #endif
 260                 }
 261
 262                 // Ensure we update the cache when we need to
 263                 update_cache = use_cache;
 264         }
 265
 266         // Set width/height of frame
 267         mlt_properties_set_int( properties, "width", self->current_width );
 268         mlt_properties_set_int( properties, "height", self->current_height );
 269         mlt_properties_set_int( properties, "real_width", mlt_properties_get_int( producer_props, "_real_width" ) );
 270         mlt_properties_set_int( properties, "real_height", mlt_properties_get_int( producer_props, "_real_height" ) );
 271
 272         // pass the image data without destructor
 273         mlt_properties_set_data( properties, "image", self->current_image, self->current_width * ( self->current_height + 1 ) * 2, NULL, NULL );
 274         mlt_properties_set_data( properties, "alpha", self->current_alpha, self->current_width * self->current_height, NULL, NULL );
 275
 276         if ( update_cache )
 277         {
 278                 mlt_frame cached = mlt_frame_init( MLT_PRODUCER_SERVICE( producer ) );
 279                 mlt_properties cached_props = MLT_FRAME_PROPERTIES( cached );
 280                 mlt_properties_set_int( cached_props, "width", self->current_width );
 281                 mlt_properties_set_int( cached_props, "height", self->current_height );
 282                 mlt_properties_set_int( cached_props, "real_width", mlt_properties_get_int( producer_props, "_real_width" ) );
 283                 mlt_properties_set_int( cached_props, "real_height", mlt_properties_get_int( producer_props, "_real_height" ) );
 284                 mlt_properties_set_data( cached_props, "image", self->current_image, self->current_width * ( self->current_height + 1 ) * 2, mlt_pool_release, NULL );
 285                 mlt_properties_set_data( cached_props, "alpha", self->current_alpha, self->current_width * self->current_height, mlt_pool_release, NULL );
 286                 mlt_properties_set_data( cache, image_key, cached, 0, ( mlt_destructor )mlt_frame_close, NULL );
 287         }
 288         mutex.unlock();
 289     }
 290 }
 291