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 library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library 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 GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include <framework/mlt_filter.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 mlt_profile profile
= mlt_service_profile( MLT_FILTER_SERVICE( this ) );
63 transition
= mlt_factory_transition( profile
, name
, NULL
);
64 mlt_properties_set_data( MLT_FILTER_PROPERTIES( this ), "instance", transition
, 0, ( mlt_destructor
)mlt_transition_close
, NULL
);
67 // We may still not have a transition...
68 if ( transition
!= NULL
)
70 // Get the transition type
71 int type
= mlt_properties_get_int( MLT_TRANSITION_PROPERTIES( transition
), "_transition_type" );
74 mlt_properties_set_int( MLT_TRANSITION_PROPERTIES( transition
), "in", mlt_properties_get_int( MLT_FILTER_PROPERTIES( this ), "in" ) );
75 mlt_properties_set_int( MLT_TRANSITION_PROPERTIES( transition
), "out", mlt_properties_get_int( MLT_FILTER_PROPERTIES( this ), "out" ) );
77 // Refresh with current user values
78 mlt_properties_pass( MLT_TRANSITION_PROPERTIES( transition
), MLT_FILTER_PROPERTIES( this ), "transition." );
80 if ( type
& 1 && !mlt_frame_is_test_card( frame
) && !( mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame
), "hide" ) & 1 ) )
82 mlt_frame_push_service( frame
, transition
);
83 mlt_frame_push_get_image( frame
, filter_get_image
);
85 if ( type
& 2 && !mlt_frame_is_test_audio( frame
) && !( mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame
), "hide" ) & 2 ) )
87 mlt_frame_push_audio( frame
, transition
);
88 mlt_frame_push_audio( frame
, filter_get_audio
);
92 mlt_properties_debug( MLT_TRANSITION_PROPERTIES( transition
), "unknown transition type", stderr
);
96 mlt_properties_debug( MLT_FILTER_PROPERTIES( this ), "no transition", stderr
);
102 /** Constructor for the filter.
105 mlt_filter
filter_transition_init( mlt_profile profile
, mlt_service_type type
, const char *id
, char *arg
)
107 mlt_filter
this = mlt_filter_new( );
110 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "transition", arg
);
111 this->process
= filter_process
;