2 * filter_transition.c -- Convert any transition into a filter
3 * Copyright (C) 2005 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 #include "filter_transition.h"
22 #include <framework/mlt_factory.h>
23 #include <framework/mlt_frame.h>
24 #include <framework/mlt_transition.h>
26 /** Get the image via the transition.
27 NB: Not all transitions will accept a and b frames being the same...
30 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
32 mlt_transition transition = mlt_frame_pop_service( this );
33 if ( mlt_properties_get_int( MLT_FRAME_PROPERTIES( this ), "image_count" ) >= 1 )
34 mlt_transition_process( transition, this, this );
35 return mlt_frame_get_image( this, image, format, width, height, writable );
38 /** Get the audio via the transition.
39 NB: Not all transitions will accept a and b frames being the same...
42 static int filter_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
44 // Obtain the transition instance
45 mlt_transition transition = mlt_frame_pop_audio( this );
46 mlt_transition_process( transition, this, this );
47 return mlt_frame_get_audio( this, buffer, format, frequency, channels, samples );
50 /** Filter processing.
53 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
55 // Obtain the transition instance
56 mlt_transition transition = mlt_properties_get_data( MLT_FILTER_PROPERTIES( this ), "instance", NULL );
58 // If we haven't created the instance, do it now
59 if ( transition == NULL )
61 char *name = mlt_properties_get( MLT_FILTER_PROPERTIES( this ), "transition" );
62 transition = mlt_factory_transition( name, NULL );
63 mlt_properties_set_data( MLT_FILTER_PROPERTIES( this ), "instance", transition, 0, ( mlt_destructor )mlt_transition_close, NULL );
66 // We may still not have a transition...
67 if ( transition != NULL )
69 // Get the transition type
70 int type = mlt_properties_get_int( MLT_TRANSITION_PROPERTIES( transition ), "_transition_type" );
73 mlt_properties_set_int( MLT_TRANSITION_PROPERTIES( transition ), "in", mlt_properties_get_int( MLT_FILTER_PROPERTIES( this ), "in" ) );
74 mlt_properties_set_int( MLT_TRANSITION_PROPERTIES( transition ), "out", mlt_properties_get_int( MLT_FILTER_PROPERTIES( this ), "out" ) );
76 // Refresh with current user values
77 mlt_properties_pass( MLT_TRANSITION_PROPERTIES( transition ), MLT_FILTER_PROPERTIES( this ), "transition." );
79 if ( type & 1 && !mlt_frame_is_test_card( frame ) && !( mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "hide" ) & 1 ) )
81 mlt_frame_push_service( frame, transition );
82 mlt_frame_push_get_image( frame, filter_get_image );
84 if ( type & 2 && !mlt_frame_is_test_audio( frame ) && !( mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "hide" ) & 2 ) )
86 mlt_frame_push_audio( frame, transition );
87 mlt_frame_push_audio( frame, filter_get_audio );
91 mlt_properties_debug( MLT_TRANSITION_PROPERTIES( transition ), "unknown transition type", stderr );
95 mlt_properties_debug( MLT_FILTER_PROPERTIES( this ), "no transition", stderr );
101 /** Constructor for the filter.
104 mlt_filter filter_transition_init( char *arg )
106 mlt_filter this = mlt_filter_new( );
109 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "transition", arg );
110 this->process = filter_process;