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115 lines
4.2 KiB
115 lines
4.2 KiB
/*
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* filter_transition.c -- Convert any transition into a filter
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* Copyright (C) 2005 Ushodaya Enterprises Limited
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* Author: Charles Yates <charles.yates@pandora.be>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "filter_transition.h"
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#include <framework/mlt_factory.h>
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#include <framework/mlt_frame.h>
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#include <framework/mlt_transition.h>
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/** Get the image via the transition.
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NB: Not all transitions will accept a and b frames being the same...
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*/
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static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
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{
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mlt_transition transition = mlt_frame_pop_service( this );
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if ( mlt_properties_get_int( MLT_FRAME_PROPERTIES( this ), "image_count" ) >= 1 )
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mlt_transition_process( transition, this, this );
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return mlt_frame_get_image( this, image, format, width, height, writable );
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}
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/** Get the audio via the transition.
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NB: Not all transitions will accept a and b frames being the same...
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*/
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static int filter_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
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{
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// Obtain the transition instance
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mlt_transition transition = mlt_frame_pop_audio( this );
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mlt_transition_process( transition, this, this );
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return mlt_frame_get_audio( this, buffer, format, frequency, channels, samples );
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}
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/** Filter processing.
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*/
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static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
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{
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// Obtain the transition instance
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mlt_transition transition = mlt_properties_get_data( MLT_FILTER_PROPERTIES( this ), "instance", NULL );
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// If we haven't created the instance, do it now
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if ( transition == NULL )
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{
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char *name = mlt_properties_get( MLT_FILTER_PROPERTIES( this ), "transition" );
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transition = mlt_factory_transition( name, NULL );
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mlt_properties_set_data( MLT_FILTER_PROPERTIES( this ), "instance", transition, 0, ( mlt_destructor )mlt_transition_close, NULL );
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}
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// We may still not have a transition...
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if ( transition != NULL )
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{
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// Get the transition type
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int type = mlt_properties_get_int( MLT_TRANSITION_PROPERTIES( transition ), "_transition_type" );
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// Set the basic info
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mlt_properties_set_int( MLT_TRANSITION_PROPERTIES( transition ), "in", mlt_properties_get_int( MLT_FILTER_PROPERTIES( this ), "in" ) );
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mlt_properties_set_int( MLT_TRANSITION_PROPERTIES( transition ), "out", mlt_properties_get_int( MLT_FILTER_PROPERTIES( this ), "out" ) );
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// Refresh with current user values
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mlt_properties_pass( MLT_TRANSITION_PROPERTIES( transition ), MLT_FILTER_PROPERTIES( this ), "transition." );
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if ( type & 1 && !mlt_frame_is_test_card( frame ) && !( mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "hide" ) & 1 ) )
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{
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mlt_frame_push_service( frame, transition );
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mlt_frame_push_get_image( frame, filter_get_image );
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}
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if ( type & 2 && !mlt_frame_is_test_audio( frame ) && !( mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "hide" ) & 2 ) )
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{
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mlt_frame_push_audio( frame, transition );
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mlt_frame_push_audio( frame, filter_get_audio );
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}
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if ( type == 0 )
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mlt_properties_debug( MLT_TRANSITION_PROPERTIES( transition ), "unknown transition type", stderr );
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}
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else
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{
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mlt_properties_debug( MLT_FILTER_PROPERTIES( this ), "no transition", stderr );
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}
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return frame;
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}
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/** Constructor for the filter.
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*/
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mlt_filter filter_transition_init( char *arg )
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{
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mlt_filter this = mlt_filter_new( );
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if ( this != NULL )
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{
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mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "transition", arg );
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this->process = filter_process;
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}
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return this;
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}
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