2 * qimage_wrapper.cpp -- a QT/QImage based producer for MLT
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@gmail.com>
6 * NB: This module is designed to be functionally equivalent to the
7 * gtk2 image loading module so it can be used as replacement.
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.
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.
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.
24 #include "qimage_wrapper.h"
30 #include <framework/mlt_pool.h>
32 static void qimage_delete( void *data
)
34 QImage
*image
= ( QImage
* )data
;
38 static void clear_buffered_image( mlt_properties producer_props
, uint8_t **current_image
, uint8_t **current_alpha
)
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
);
48 static void assign_buffered_image( mlt_properties producer_props
, uint8_t *current_image
, uint8_t *current_alpha
, int width
, int height
)
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
);
60 void refresh_qimage( mlt_frame frame
, int width
, int height
)
62 // Obtain a previous assigned qimage (if it exists)
63 QImage
*qimage
= ( QImage
* )mlt_properties_get_data( MLT_FRAME_PROPERTIES( frame
), "qimage", NULL
);
65 // Obtain properties of frame
66 mlt_properties properties
= MLT_FRAME_PROPERTIES( frame
);
68 // Obtain the producer for this frame
69 producer_qimage self
= ( producer_qimage
)mlt_properties_get_data( properties
, "producer_qimage", NULL
);
71 // Obtain the producer
72 mlt_producer producer
= &self
->parent
;
74 // Obtain properties of producer
75 mlt_properties producer_props
= MLT_PRODUCER_PROPERTIES( producer
);
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
);
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" );
88 // Get the time to live for each frame
89 double ttl
= mlt_properties_get_int( producer_props
, "ttl" );
91 // Get the original position of this frame
92 mlt_position position
= mlt_properties_get_position( properties
, "qimage_position" );
95 int image_idx
= ( int )floor( ( double )position
/ ttl
) % self
->count
;
99 sprintf( image_key
, "%d", image_idx
);
101 // Check if the frame is already loaded
106 cache
= mlt_properties_new( );
107 mlt_properties_set_data( producer_props
, "_cache", cache
, 0, ( mlt_destructor
)mlt_properties_close
, NULL
);
110 mlt_frame cached
= ( mlt_frame
)mlt_properties_get_data( cache
, image_key
, NULL
);
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
);
123 if ( width
!= 0 && ( width
!= current_width
|| height
!= current_height
) )
124 current_image
= NULL
;
126 assign_buffered_image( producer_props
, current_image
, current_alpha
, current_width
, current_height
);
130 // optimization for subsequent iterations on single picture
131 if ( width
!= 0 && current_image
!= NULL
&& image_idx
== self
->image_idx
)
133 if ( width
!= current_width
|| height
!= current_height
)
135 qimage
= ( QImage
* )mlt_properties_get_data( producer_props
, "_qimage", NULL
);
136 clear_buffered_image( producer_props
, ¤t_image
, ¤t_alpha
);
139 else if ( qimage
== NULL
&& ( current_image
== NULL
|| image_idx
!= self
->image_idx
) )
141 clear_buffered_image( producer_props
, ¤t_image
, ¤t_alpha
);
143 self
->image_idx
= image_idx
;
144 qimage
= new QImage( mlt_properties_get_value( self
->filenames
, image_idx
) );
146 if ( !qimage
->isNull( ) )
148 QImage
*frame_copy
= new QImage( *qimage
);
150 // Store the width/height of the pixbuf
151 current_width
= qimage
->width( );
152 current_height
= qimage
->height( );
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
);
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
)
172 char *interps
= mlt_properties_get( properties
, "rescale.interp" );
175 // QImage has two scaling modes - we'll toggle between them here
176 if ( strcmp( interps
, "tiles" ) == 0 )
178 else if ( strcmp( interps
, "hyper" ) == 0 )
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 );
185 // Store width and height
186 current_width
= width
;
187 current_height
= height
;
189 // Allocate/define image
190 current_image
= ( uint8_t * )mlt_pool_alloc( width
* ( height
+ 1 ) * 2 );
192 // Allocate the alpha mask
193 current_alpha
= ( uint8_t * )mlt_pool_alloc( current_width
* current_height
);
196 if ( QImage
::systemByteOrder( ) == QImage
::BigEndian
)
197 mlt_convert_argb_to_yuv422( temp
.bits( ), current_width
, current_height
, temp
.bytesPerLine( ), current_image
, current_alpha
);
199 mlt_convert_bgr24a_to_yuv422( temp
.bits( ), current_width
, current_height
, temp
.bytesPerLine( ), current_image
, current_alpha
);
201 assign_buffered_image( producer_props
, current_image
, current_alpha
, current_width
, current_height
);
203 // Ensure we update the cache when we need to
204 update_cache
= use_cache
;
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" ) );
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
);
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
);