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214 lines
5.4 KiB
214 lines
5.4 KiB
/*
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* mlt_filter.c -- abstraction for all filter services
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* Copyright (C) 2003-2004 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 "config.h"
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#include "mlt_filter.h"
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#include "mlt_frame.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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static int filter_get_frame( mlt_service this, mlt_frame_ptr frame, int index );
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/** Constructor method.
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*/
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int mlt_filter_init( mlt_filter this, void *child )
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{
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mlt_service service = &this->parent;
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memset( this, 0, sizeof( struct mlt_filter_s ) );
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this->child = child;
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if ( mlt_service_init( service, this ) == 0 )
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{
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mlt_properties properties = MLT_SERVICE_PROPERTIES( service );
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// Override the get_frame method
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service->get_frame = filter_get_frame;
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// Define the destructor
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service->close = ( mlt_destructor )mlt_filter_close;
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service->close_object = this;
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// Default in, out, track properties
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mlt_properties_set_position( properties, "in", 0 );
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mlt_properties_set_position( properties, "out", 0 );
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mlt_properties_set_int( properties, "track", 0 );
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return 0;
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}
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return 1;
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}
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/** Create a new filter.
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*/
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mlt_filter mlt_filter_new( )
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{
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mlt_filter this = calloc( 1, sizeof( struct mlt_filter_s ) );
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if ( this != NULL )
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mlt_filter_init( this, NULL );
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return this;
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}
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/** Get the service associated to this filter
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*/
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mlt_service mlt_filter_service( mlt_filter this )
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{
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return this != NULL ? &this->parent : NULL;
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}
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/** Get the properties associated to this filter.
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*/
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mlt_properties mlt_filter_properties( mlt_filter this )
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{
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return MLT_SERVICE_PROPERTIES( MLT_FILTER_SERVICE( this ) );
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}
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/** Connect this filter to a producers track. Note that a filter only operates
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on a single track, and by default it operates on the entirety of that track.
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*/
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int mlt_filter_connect( mlt_filter this, mlt_service producer, int index )
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{
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int ret = mlt_service_connect_producer( &this->parent, producer, index );
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// If the connection was successful, grab the producer, track and reset in/out
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if ( ret == 0 )
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{
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mlt_properties properties = MLT_SERVICE_PROPERTIES( &this->parent );
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mlt_properties_set_position( properties, "in", 0 );
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mlt_properties_set_position( properties, "out", 0 );
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mlt_properties_set_int( properties, "track", index );
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}
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return ret;
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}
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/** Tune the in/out points.
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*/
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void mlt_filter_set_in_and_out( mlt_filter this, mlt_position in, mlt_position out )
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{
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mlt_properties properties = MLT_SERVICE_PROPERTIES( &this->parent );
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mlt_properties_set_position( properties, "in", in );
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mlt_properties_set_position( properties, "out", out );
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}
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/** Return the track that this filter is operating on.
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*/
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int mlt_filter_get_track( mlt_filter this )
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{
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mlt_properties properties = MLT_SERVICE_PROPERTIES( &this->parent );
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return mlt_properties_get_int( properties, "track" );
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}
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/** Get the in point.
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*/
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mlt_position mlt_filter_get_in( mlt_filter this )
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{
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mlt_properties properties = MLT_SERVICE_PROPERTIES( &this->parent );
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return mlt_properties_get_position( properties, "in" );
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}
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/** Get the out point.
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*/
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mlt_position mlt_filter_get_out( mlt_filter this )
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{
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mlt_properties properties = MLT_SERVICE_PROPERTIES( &this->parent );
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return mlt_properties_get_position( properties, "out" );
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}
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/** Process the frame.
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*/
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mlt_frame mlt_filter_process( mlt_filter this, mlt_frame frame )
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{
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int disable = mlt_properties_get_int( MLT_FILTER_PROPERTIES( this ), "disable" );
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if ( disable || this->process == NULL )
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return frame;
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else
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return this->process( this, frame );
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}
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/** Get a frame from this filter.
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*/
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static int filter_get_frame( mlt_service service, mlt_frame_ptr frame, int index )
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{
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mlt_filter this = service->child;
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// Get coords in/out/track
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int track = mlt_filter_get_track( this );
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int in = mlt_filter_get_in( this );
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int out = mlt_filter_get_out( this );
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// Get the producer this is connected to
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mlt_service producer = mlt_service_producer( &this->parent );
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// If the frame request is for this filters track, we need to process it
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if ( index == track || track == -1 )
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{
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int ret = mlt_service_get_frame( producer, frame, index );
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if ( ret == 0 )
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{
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mlt_position position = mlt_frame_get_position( *frame );
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if ( position >= in && ( out == 0 || position <= out ) )
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*frame = mlt_filter_process( this, *frame );
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return 0;
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}
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else
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{
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*frame = mlt_frame_init( );
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return 0;
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}
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}
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else
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{
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return mlt_service_get_frame( producer, frame, index );
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}
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}
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/** Close the filter.
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*/
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void mlt_filter_close( mlt_filter this )
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{
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if ( this != NULL && mlt_properties_dec_ref( MLT_FILTER_PROPERTIES( this ) ) <= 0 )
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{
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if ( this->close != NULL )
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{
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this->close( this );
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}
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else
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{
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this->parent.close = NULL;
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mlt_service_close( &this->parent );
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}
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free( this );
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}
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}
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