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