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 #include <qimage.h>
  26
  27
  28 #include "config.h"
  29
  30 #ifdef USE_KDE
  31 #include <kinstance.h>
  32 #include <kimageio.h>
  33 #endif
  34
  35 #include <cmath>
  36
  37 extern "C" {
  38
  39 #include <framework/mlt_pool.h>
  40
  41 #ifdef USE_KDE
  42 static KInstance *instance = 0L;
  43 #endif
  44
  45 static void qimage_delete( void *data )
  46 {
  47         QImage *image = ( QImage * )data;
  48         delete image;
  49 #ifdef USE_KDE
  50         if (instance) delete instance;
  51         instance = 0L;
  52 #endif
  53 }
  54
  55 static void clear_buffered_image( mlt_properties producer_props, uint8_t **current_image, uint8_t **current_alpha )
  56 {
  57         mlt_events_block( producer_props, NULL );
  58         mlt_properties_set_data( producer_props, "_qimage_image", NULL, 0, NULL, NULL );
  59         mlt_properties_set_data( producer_props, "_qimage_alpha", NULL, 0, NULL, NULL );
  60         *current_image = NULL;
  61         *current_alpha = NULL;
  62         mlt_events_unblock( producer_props, NULL );
  63 }
  64
  65 static void assign_buffered_image( mlt_properties producer_props, uint8_t *current_image, uint8_t *current_alpha, int width, int height )
  66 {
  67         int use_cache = mlt_properties_get_int( producer_props, "cache" );
  68         mlt_destructor destructor = use_cache ? NULL : mlt_pool_release;
  69         mlt_events_block( producer_props, NULL );
  70         mlt_properties_set_data( producer_props, "_qimage_image", current_image, 0, destructor, NULL );
  71         mlt_properties_set_data( producer_props, "_qimage_alpha", current_alpha, 0, destructor, NULL );
  72         mlt_properties_set_int( producer_props, "_qimage_width", width );
  73         mlt_properties_set_int( producer_props, "_qimage_height", height );
  74         mlt_events_unblock( producer_props, NULL );
  75 }
  76
  77 void init_qimage()
  78 {
  79 #ifdef USE_KDE
  80         if (!instance) {
  81             instance = new KInstance("qimage_prod");
  82             KImageIO::registerFormats();
  83         }
  84 #endif
  85 }
  86
  87 void refresh_qimage( mlt_frame frame, int width, int height )
  88 {
  89         // Obtain a previous assigned qimage (if it exists)
  90         QImage *qimage = ( QImage * )mlt_properties_get_data( MLT_FRAME_PROPERTIES( frame ), "qimage", NULL );
  91
  92         // Obtain properties of frame
  93         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
  94
  95         // Obtain the producer for this frame
  96         producer_qimage self = ( producer_qimage )mlt_properties_get_data( properties, "producer_qimage", NULL );
  97
  98         // Obtain the producer
  99         mlt_producer producer = &self->parent;
 100
 101         // Obtain properties of producer
 102         mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
 103
 104         // Obtain the cache flag and structure
 105         int use_cache = mlt_properties_get_int( producer_props, "cache" );
 106         mlt_properties cache = ( mlt_properties )mlt_properties_get_data( producer_props, "_cache", NULL );
 107         int update_cache = 0;
 108
 109         // Retrieve current info if available
 110         uint8_t *current_image = ( uint8_t * )mlt_properties_get_data( producer_props, "_qimage_image", NULL );
 111         uint8_t *current_alpha = ( uint8_t * )mlt_properties_get_data( producer_props, "_qimage_alpha", NULL );
 112         int current_width = mlt_properties_get_int( producer_props, "_qimage_width" );
 113         int current_height = mlt_properties_get_int( producer_props, "_qimage_height" );
 114
 115         // Get the time to live for each frame
 116         double ttl = mlt_properties_get_int( producer_props, "ttl" );
 117
 118         // Get the original position of this frame
 119         mlt_position position = mlt_properties_get_position( properties, "qimage_position" );
 120
 121         // Image index
 122         int image_idx = ( int )floor( ( double )position / ttl ) % self->count;
 123
 124         // Key for the cache
 125         char image_key[ 10 ];
 126         sprintf( image_key, "%d", image_idx );
 127
 128         // Check if the frame is already loaded
 129         if ( use_cache )
 130         {
 131                 if ( cache == NULL )
 132                 {
 133                         cache = mlt_properties_new( );
 134                         mlt_properties_set_data( producer_props, "_cache", cache, 0, ( mlt_destructor )mlt_properties_close, NULL );
 135                 }
 136
 137                 mlt_frame cached = ( mlt_frame )mlt_properties_get_data( cache, image_key, NULL );
 138
 139                 if ( cached )
 140                 {
 141                         self->image_idx = image_idx;
 142                         mlt_properties cached_props = MLT_FRAME_PROPERTIES( cached );
 143                         current_width = mlt_properties_get_int( cached_props, "width" );
 144                         current_height = mlt_properties_get_int( cached_props, "height" );
 145                         mlt_properties_set_int( producer_props, "_real_width", mlt_properties_get_int( cached_props, "real_width" ) );
 146                         mlt_properties_set_int( producer_props, "_real_height", mlt_properties_get_int( cached_props, "real_height" ) );
 147                         current_image = ( uint8_t * )mlt_properties_get_data( cached_props, "image", NULL );
 148                         current_alpha = ( uint8_t * )mlt_properties_get_data( cached_props, "alpha", NULL );
 149
 150                         if ( width != 0 && ( width != current_width || height != current_height ) )
 151                                 current_image = NULL;
 152
 153                         assign_buffered_image( producer_props, current_image, current_alpha, current_width, current_height );
 154                 }
 155         }
 156
 157     // optimization for subsequent iterations on single picture
 158         if ( width != 0 && current_image != NULL && image_idx == self->image_idx )
 159         {
 160                 if ( width != current_width || height != current_height )
 161                 {
 162                         qimage = ( QImage * )mlt_properties_get_data( producer_props, "_qimage", NULL );
 163                         clear_buffered_image( producer_props, &current_image, &current_alpha );
 164                 }
 165         }
 166         else if ( qimage == NULL && ( current_image == NULL || image_idx != self->image_idx ) )
 167         {
 168                 clear_buffered_image( producer_props, &current_image, &current_alpha );
 169
 170                 self->image_idx = image_idx;
 171                 qimage = new QImage( mlt_properties_get_value( self->filenames, image_idx ) );
 172
 173                 if ( !qimage->isNull( ) )
 174                 {
 175                         QImage *frame_copy = new QImage( *qimage );
 176
 177                         // Store the width/height of the pixbuf
 178                         current_width = qimage->width( );
 179                         current_height = qimage->height( );
 180
 181                         // Register qimage for destruction and reuse
 182                         mlt_events_block( producer_props, NULL );
 183                         mlt_properties_set_data( producer_props, "_qimage", qimage, 0, ( mlt_destructor )qimage_delete, NULL );
 184                         mlt_properties_set_data( MLT_FRAME_PROPERTIES( frame ), "qimage", frame_copy, 0, ( mlt_destructor )qimage_delete, NULL );
 185                         mlt_properties_set_int( producer_props, "_real_width", current_width );
 186                         mlt_properties_set_int( producer_props, "_real_height", current_height );
 187                         mlt_events_unblock( producer_props, NULL );
 188                 }
 189                 else
 190                 {
 191                         delete qimage;
 192                         qimage = NULL;
 193                 }
 194         }
 195
 196         // If we have a pixbuf and this request specifies a valid dimension and we haven't already got a cached version...
 197         if ( qimage && width > 0 && current_image == NULL )
 198         {
 199                 char *interps = mlt_properties_get( properties, "rescale.interp" );
 200                 int interp = 0;
 201
 202                 // QImage has two scaling modes - we'll toggle between them here
 203                 if ( strcmp( interps, "tiles" ) == 0 )
 204                         interp = 1;
 205                 else if ( strcmp( interps, "hyper" ) == 0 )
 206                         interp = 1;
 207
 208                 // Note - the original qimage is already safe and ready for destruction
 209                 QImage scaled = interp == 0 ? qimage->scale( width, height, QImage::ScaleFree ) : qimage->smoothScale( width, height, QImage::ScaleFree );
 210                 QImage temp = scaled.convertDepth( 32 );
 211
 212                 // Store width and height
 213                 current_width = width;
 214                 current_height = height;
 215
 216                 // Allocate/define image
 217                 current_image = ( uint8_t * )mlt_pool_alloc( width * ( height + 1 ) * 2 );
 218
 219                 // Allocate the alpha mask
 220                 current_alpha = ( uint8_t * )mlt_pool_alloc( current_width * current_height );
 221
 222                 // Convert the image
 223                 if ( QImage::systemByteOrder( ) == QImage::BigEndian )
 224                         mlt_convert_argb_to_yuv422( temp.bits( ), current_width, current_height, temp.bytesPerLine( ), current_image, current_alpha );
 225                 else
 226                         mlt_convert_bgr24a_to_yuv422( temp.bits( ), current_width, current_height, temp.bytesPerLine( ), current_image, current_alpha );
 227
 228                 assign_buffered_image( producer_props, current_image, current_alpha, current_width, current_height );
 229
 230                 // Ensure we update the cache when we need to
 231                 update_cache = use_cache;
 232         }
 233
 234         // Set width/height of frame
 235         mlt_properties_set_int( properties, "width", current_width );
 236         mlt_properties_set_int( properties, "height", current_height );
 237         mlt_properties_set_int( properties, "real_width", mlt_properties_get_int( producer_props, "_real_width" ) );
 238         mlt_properties_set_int( properties, "real_height", mlt_properties_get_int( producer_props, "_real_height" ) );
 239
 240         // pass the image data without destructor
 241         mlt_properties_set_data( properties, "image", current_image, current_width * ( current_height + 1 ) * 2, NULL, NULL );
 242         mlt_properties_set_data( properties, "alpha", current_alpha, current_width * current_height, NULL, NULL );
 243
 244         if ( update_cache )
 245         {
 246                 mlt_frame cached = mlt_frame_init( );
 247                 mlt_properties cached_props = MLT_FRAME_PROPERTIES( cached );
 248                 mlt_properties_set_int( cached_props, "width", current_width );
 249                 mlt_properties_set_int( cached_props, "height", current_height );
 250                 mlt_properties_set_int( cached_props, "real_width", mlt_properties_get_int( producer_props, "_real_width" ) );
 251                 mlt_properties_set_int( cached_props, "real_height", mlt_properties_get_int( producer_props, "_real_height" ) );
 252                 mlt_properties_set_data( cached_props, "image", current_image, current_width * ( current_height + 1 ) * 2, mlt_pool_release, NULL );
 253                 mlt_properties_set_data( cached_props, "alpha", current_alpha, current_width * current_height, mlt_pool_release, NULL );
 254                 mlt_properties_set_data( cache, image_key, cached, 0, ( mlt_destructor )mlt_frame_close, NULL );
 255         }
 256 }
 257
 258 }
 259