X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fframework%2Fmlt_tractor.c;h=b39b194937b18b0a63f31d7d95e9625da5fc2c2c;hb=830202089a59519a23009370325823c1a34e1e60;hp=16c7c50ffbffb599d8a67d92c7c62444177c60c5;hpb=f9c7e4e64fe57451a17ef25a727c8d3387ee1737;p=mlt diff --git a/src/framework/mlt_tractor.c b/src/framework/mlt_tractor.c index 16c7c50f..b39b1949 100644 --- a/src/framework/mlt_tractor.c +++ b/src/framework/mlt_tractor.c @@ -1,156 +1,346 @@ -/* - * mlt_tractor.c -- tractor service class - * Copyright (C) 2003-2004 Ushodaya Enterprises Limited - * Author: Charles Yates +/** + * \file mlt_tractor.c + * \brief tractor service class + * \see mlt_tractor_s * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. + * Copyright (C) 2003-2009 Ushodaya Enterprises Limited + * \author Charles Yates * - * This program is distributed in the hope that it will be useful, + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software Foundation, - * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ -#include "config.h" - #include "mlt_tractor.h" #include "mlt_frame.h" #include "mlt_multitrack.h" +#include "mlt_field.h" +#include "mlt_log.h" #include #include #include +#include -/** Private structure. +/* Forward references to static methods. */ -struct mlt_tractor_s -{ - struct mlt_producer_s parent; - mlt_service producer; -}; +static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int track ); +static void mlt_tractor_listener( mlt_multitrack tracks, mlt_tractor self ); -/** Forward references to static methods. -*/ +/** Construct a tractor without a field or multitrack. + * + * Sets the resource property to "", the mlt_type to "mlt_producer", + * and mlt_service to "tractor". + * + * \public \memberof mlt_tractor_s + * \return the new tractor + */ -static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int track ); -static void producer_close( mlt_producer this ); +mlt_tractor mlt_tractor_init( ) +{ + mlt_tractor self = calloc( 1, sizeof( struct mlt_tractor_s ) ); + if ( self != NULL ) + { + mlt_producer producer = &self->parent; + if ( mlt_producer_init( producer, self ) == 0 ) + { + mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer ); -/** Constructor for the tractor. + mlt_properties_set( properties, "resource", "" ); + mlt_properties_set( properties, "mlt_type", "mlt_producer" ); + mlt_properties_set( properties, "mlt_service", "tractor" ); + mlt_properties_set_int( properties, "in", 0 ); + mlt_properties_set_int( properties, "out", -1 ); + mlt_properties_set_int( properties, "length", 0 ); - TODO: thread this service... -*/ + producer->get_frame = producer_get_frame; + producer->close = ( mlt_destructor )mlt_tractor_close; + producer->close_object = self; + } + else + { + free( self ); + self = NULL; + } + } + return self; +} -mlt_tractor mlt_tractor_init( ) +/** Construct a tractor as well as a field and multitrack. + * + * Sets the resource property to "", the mlt_type to "mlt_producer", + * and mlt_service to "tractor". + * + * \public \memberof mlt_tractor_s + * \return the new tractor + */ + +mlt_tractor mlt_tractor_new( ) { - mlt_tractor this = calloc( sizeof( struct mlt_tractor_s ), 1 ); - if ( this != NULL ) + mlt_tractor self = calloc( 1, sizeof( struct mlt_tractor_s ) ); + if ( self != NULL ) { - mlt_producer producer = &this->parent; - if ( mlt_producer_init( producer, this ) == 0 ) + mlt_producer producer = &self->parent; + if ( mlt_producer_init( producer, self ) == 0 ) { - mlt_properties_set( mlt_producer_properties( producer ), "resource", "" ); - mlt_properties_set( mlt_producer_properties( producer ), "mlt_type", "mlt_producer" ); - mlt_properties_set( mlt_producer_properties( producer ), "mlt_service", "tractor" ); + mlt_multitrack multitrack = mlt_multitrack_init( ); + mlt_field field = mlt_field_new( multitrack, self ); + mlt_properties props = MLT_PRODUCER_PROPERTIES( producer ); + + mlt_properties_set( props, "resource", "" ); + mlt_properties_set( props, "mlt_type", "mlt_producer" ); + mlt_properties_set( props, "mlt_service", "tractor" ); + mlt_properties_set_position( props, "in", 0 ); + mlt_properties_set_position( props, "out", 0 ); + mlt_properties_set_position( props, "length", 0 ); + mlt_properties_set_data( props, "multitrack", multitrack, 0, ( mlt_destructor )mlt_multitrack_close, NULL ); + mlt_properties_set_data( props, "field", field, 0, ( mlt_destructor )mlt_field_close, NULL ); + + mlt_events_listen( MLT_MULTITRACK_PROPERTIES( multitrack ), self, "producer-changed", ( mlt_listener )mlt_tractor_listener ); producer->get_frame = producer_get_frame; - producer->close = producer_close; + producer->close = ( mlt_destructor )mlt_tractor_close; + producer->close_object = self; } else { - free( this ); - this = NULL; + free( self ); + self = NULL; } } - return this; + return self; } /** Get the service object associated to the tractor. -*/ + * + * \public \memberof mlt_tractor_s + * \param self a tractor + * \return the parent service object + * \see MLT_TRACTOR_SERVICE + */ -mlt_service mlt_tractor_service( mlt_tractor this ) +mlt_service mlt_tractor_service( mlt_tractor self ) { - return mlt_producer_service( &this->parent ); + return MLT_PRODUCER_SERVICE( &self->parent ); } /** Get the producer object associated to the tractor. -*/ + * + * \public \memberof mlt_tractor_s + * \param self a tractor + * \return the parent producer object + * \see MLT_TRACTOR_PRODUCER + */ -mlt_producer mlt_tractor_producer( mlt_tractor this ) +mlt_producer mlt_tractor_producer( mlt_tractor self ) { - return &this->parent; + return self != NULL ? &self->parent : NULL; } /** Get the properties object associated to the tractor. -*/ + * + * \public \memberof mlt_tractor_s + * \param self a tractor + * \return the tractor's property list + * \see MLT_TRACTOR_PROPERTIES + */ + +mlt_properties mlt_tractor_properties( mlt_tractor self ) +{ + return MLT_PRODUCER_PROPERTIES( &self->parent ); +} + +/** Get the field self tractor is harvesting. + * + * \public \memberof mlt_tractor_s + * \param self a tractor + * \return a field or NULL if there is no field for this tractor + */ + +mlt_field mlt_tractor_field( mlt_tractor self ) +{ + return mlt_properties_get_data( MLT_TRACTOR_PROPERTIES( self ), "field", NULL ); +} + +/** Get the multitrack a tractor is pulling. + * + * \public \memberof mlt_tractor_s + * \param self a tractor + * \return a multitrack or NULL if there is none + */ + +mlt_multitrack mlt_tractor_multitrack( mlt_tractor self ) +{ + return mlt_properties_get_data( MLT_TRACTOR_PROPERTIES( self ), "multitrack", NULL ); +} -mlt_properties mlt_tractor_properties( mlt_tractor this ) +/** Ensure the tractors in/out points match the multitrack. + * + * \public \memberof mlt_tractor_s + * \param self a tractor + */ + +void mlt_tractor_refresh( mlt_tractor self ) { - return mlt_producer_properties( &this->parent ); + mlt_multitrack multitrack = mlt_tractor_multitrack( self ); + mlt_properties multitrack_props = MLT_MULTITRACK_PROPERTIES( multitrack ); + mlt_properties properties = MLT_TRACTOR_PROPERTIES( self ); + mlt_events_block( multitrack_props, properties ); + mlt_events_block( properties, properties ); + mlt_multitrack_refresh( multitrack ); + mlt_properties_set_position( properties, "in", 0 ); + mlt_properties_set_position( properties, "out", mlt_properties_get_position( multitrack_props, "out" ) ); + mlt_events_unblock( properties, properties ); + mlt_events_unblock( multitrack_props, properties ); + mlt_properties_set_position( properties, "length", mlt_properties_get_position( multitrack_props, "length" ) ); +} + +static void mlt_tractor_listener( mlt_multitrack tracks, mlt_tractor self ) +{ + mlt_tractor_refresh( self ); } /** Connect the tractor. -*/ + * + * \public \memberof mlt_tractor_s + * \param self a tractor + * \param producer a producer + * \return true on error + */ -int mlt_tractor_connect( mlt_tractor this, mlt_service producer ) +int mlt_tractor_connect( mlt_tractor self, mlt_service producer ) { - int ret = mlt_service_connect_producer( mlt_tractor_service( this ), producer, 0 ); + int ret = mlt_service_connect_producer( MLT_TRACTOR_SERVICE( self ), producer, 0 ); // This is the producer we're going to connect to if ( ret == 0 ) - this->producer = producer; + self->producer = producer; return ret; } -static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable ) +/** Set the producer for a specific track. + * + * \public \memberof mlt_tractor_s + * \param self a tractor + * \param producer a producer + * \param index the 0-based track index + * \return true on error + */ + +int mlt_tractor_set_track( mlt_tractor self, mlt_producer producer, int index ) { - mlt_properties properties = mlt_frame_properties( this ); - mlt_frame frame = mlt_frame_pop_service( this ); - mlt_properties_inherit( mlt_frame_properties( frame ), properties ); + return mlt_multitrack_connect( mlt_tractor_multitrack( self ), producer, index ); +} + +/** Get the producer for a specific track. + * + * \public \memberof mlt_tractor_s + * \param self a tractor + * \param index the 0-based track index + * \return the producer for track \p index + */ + +mlt_producer mlt_tractor_get_track( mlt_tractor self, int index ) +{ + return mlt_multitrack_track( mlt_tractor_multitrack( self ), index ); +} + +static int producer_get_image( mlt_frame self, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable ) +{ + uint8_t *data = NULL; + int size = 0; + mlt_properties properties = MLT_FRAME_PROPERTIES( self ); + mlt_frame frame = mlt_frame_pop_service( self ); + mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame ); + mlt_properties_set( frame_properties, "rescale.interp", mlt_properties_get( properties, "rescale.interp" ) ); + mlt_properties_set_int( frame_properties, "resize_alpha", mlt_properties_get_int( properties, "resize_alpha" ) ); + mlt_properties_set_int( frame_properties, "distort", mlt_properties_get_int( properties, "distort" ) ); + mlt_properties_set_int( frame_properties, "consumer_deinterlace", mlt_properties_get_int( properties, "consumer_deinterlace" ) ); + mlt_properties_set( frame_properties, "deinterlace_method", mlt_properties_get( properties, "deinterlace_method" ) ); + mlt_properties_set_int( frame_properties, "consumer_tff", mlt_properties_get_int( properties, "consumer_tff" ) ); mlt_frame_get_image( frame, buffer, format, width, height, writable ); - mlt_properties_set_data( properties, "image", *buffer, *width * *height * 2, NULL, NULL ); + mlt_frame_set_image( self, *buffer, 0, NULL ); mlt_properties_set_int( properties, "width", *width ); mlt_properties_set_int( properties, "height", *height ); - mlt_properties_inherit( properties, mlt_frame_properties( frame ) ); + mlt_properties_set_int( properties, "format", *format ); + mlt_properties_set_double( properties, "aspect_ratio", mlt_frame_get_aspect_ratio( frame ) ); + mlt_properties_set_int( properties, "progressive", mlt_properties_get_int( frame_properties, "progressive" ) ); + mlt_properties_set_int( properties, "distort", mlt_properties_get_int( frame_properties, "distort" ) ); + mlt_properties_set_int( properties, "colorspace", mlt_properties_get_int( frame_properties, "colorspace" ) ); + mlt_properties_set_int( properties, "force_full_luma", mlt_properties_get_int( frame_properties, "force_full_luma" ) ); + mlt_properties_set_int( properties, "top_field_first", mlt_properties_get_int( frame_properties, "top_field_first" ) ); + data = mlt_frame_get_alpha_mask( frame ); + mlt_properties_get_data( frame_properties, "alpha", &size ); + mlt_frame_set_alpha( self, data, size, NULL ); + self->convert_image = frame->convert_image; + self->convert_audio = frame->convert_audio; return 0; } -static int producer_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples ) +static int producer_get_audio( mlt_frame self, void **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples ) { - mlt_properties properties = mlt_frame_properties( this ); - mlt_frame frame = mlt_frame_pop_audio( this ); + mlt_properties properties = MLT_FRAME_PROPERTIES( self ); + mlt_frame frame = mlt_frame_pop_audio( self ); mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples ); - mlt_properties_set_data( properties, "audio", *buffer, 0, NULL, NULL ); - mlt_properties_set_int( properties, "frequency", *frequency ); - mlt_properties_set_int( properties, "channels", *channels ); + mlt_frame_set_audio( self, *buffer, *format, mlt_audio_format_size( *format, *samples, *channels ), NULL ); + mlt_properties_set_int( properties, "audio_frequency", *frequency ); + mlt_properties_set_int( properties, "audio_channels", *channels ); + mlt_properties_set_int( properties, "audio_samples", *samples ); return 0; } +static void destroy_data_queue( void *arg ) +{ + if ( arg != NULL ) + { + // Assign the correct type + mlt_deque queue = arg; + + // Iterate through each item and destroy them + while ( mlt_deque_peek_front( queue ) != NULL ) + mlt_properties_close( mlt_deque_pop_back( queue ) ); + + // Close the deque + mlt_deque_close( queue ); + } +} + /** Get the next frame. -*/ + * + * \private \memberof mlt_tractor_s + * \param parent the producer interface to the tractor + * \param[out] frame a frame by reference + * \param track the 0-based track index + * \return true on error + */ static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int track ) { - mlt_tractor this = parent->child; + mlt_tractor self = parent->child; // We only respond to the first track requests - if ( track == 0 && this->producer != NULL ) + if ( track == 0 && self->producer != NULL ) { int i = 0; int done = 0; mlt_frame temp = NULL; int count = 0; + int image_count = 0; // Get the properties of the parent producer - mlt_properties properties = mlt_producer_properties( parent ); + mlt_properties properties = MLT_PRODUCER_PROPERTIES( parent ); // Try to obtain the multitrack associated to the tractor mlt_multitrack multitrack = mlt_properties_get_data( properties, "multitrack", NULL ); @@ -158,9 +348,15 @@ static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int tra // Or a specific producer mlt_producer producer = mlt_properties_get_data( properties, "producer", NULL ); - // If we don't have one, we're in trouble... + // Determine whether this tractor feeds to the consumer or stops here + int global_feed = mlt_properties_get_int( properties, "global_feed" ); + + // If we don't have one, we're in trouble... if ( multitrack != NULL ) { + // The output frame will hold the 'global' data feeds (ie: those which are targetted for the final frame) + mlt_deque data_queue = mlt_deque_init( ); + // Used to garbage collect all frames char label[ 30 ]; @@ -173,64 +369,161 @@ static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int tra // We'll store audio and video frames to use here mlt_frame audio = NULL; mlt_frame video = NULL; + mlt_frame first_video = NULL; + + // Temporary properties + mlt_properties temp_properties = NULL; // Get the multitrack's producer - mlt_producer target = mlt_multitrack_producer( multitrack ); + mlt_producer target = MLT_MULTITRACK_PRODUCER( multitrack ); mlt_producer_seek( target, mlt_producer_frame( parent ) ); mlt_producer_set_speed( target, mlt_producer_get_speed( parent ) ); // We will create one frame and attach everything to it - *frame = mlt_frame_init( ); + *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( parent ) ); // Get the properties of the frame - frame_properties = mlt_frame_properties( *frame ); + frame_properties = MLT_FRAME_PROPERTIES( *frame ); // Loop through each of the tracks we're harvesting for ( i = 0; !done; i ++ ) { // Get a frame from the producer - mlt_service_get_frame( this->producer, &temp, i ); + mlt_service_get_frame( self->producer, &temp, i ); + + // Get the temporary properties + temp_properties = MLT_FRAME_PROPERTIES( temp ); + + // Pass all unique meta properties from the producer's frame to the new frame + mlt_properties_lock( temp_properties ); + int props_count = mlt_properties_count( temp_properties ); + int j; + for ( j = 0; j < props_count; j ++ ) + { + char *name = mlt_properties_get_name( temp_properties, j ); + if ( !strncmp( name, "meta.", 5 ) && !mlt_properties_get( frame_properties, name ) ) + mlt_properties_set( frame_properties, name, mlt_properties_get_value( temp_properties, j ) ); + } + mlt_properties_unlock( temp_properties ); + + // Copy the format conversion virtual functions + if ( ! (*frame)->convert_image && temp->convert_image ) + (*frame)->convert_image = temp->convert_image; + if ( ! (*frame)->convert_audio && temp->convert_audio ) + (*frame)->convert_audio = temp->convert_audio; // Check for last track - done = mlt_properties_get_int( mlt_frame_properties( temp ), "last_track" ); + done = mlt_properties_get_int( temp_properties, "last_track" ); + + // Handle fx only tracks + if ( mlt_properties_get_int( temp_properties, "fx_cut" ) ) + { + int hide = ( video == NULL ? 1 : 0 ) | ( audio == NULL ? 2 : 0 ); + mlt_properties_set_int( temp_properties, "hide", hide ); + } // We store all frames with a destructor on the output frame sprintf( label, "_%s_%d", id, count ++ ); mlt_properties_set_data( frame_properties, label, temp, 0, ( mlt_destructor )mlt_frame_close, NULL ); + // We want to append all 'final' feeds to the global queue + if ( !done && mlt_properties_get_data( temp_properties, "data_queue", NULL ) != NULL ) + { + // Move the contents of this queue on to the output frames data queue + mlt_deque sub_queue = mlt_properties_get_data( MLT_FRAME_PROPERTIES( temp ), "data_queue", NULL ); + mlt_deque temp = mlt_deque_init( ); + while ( global_feed && mlt_deque_count( sub_queue ) ) + { + mlt_properties p = mlt_deque_pop_back( sub_queue ); + if ( mlt_properties_get_int( p, "final" ) ) + mlt_deque_push_back( data_queue, p ); + else + mlt_deque_push_back( temp, p ); + } + while( mlt_deque_count( temp ) ) + mlt_deque_push_front( sub_queue, mlt_deque_pop_back( temp ) ); + mlt_deque_close( temp ); + } + + // Now do the same with the global queue but without the conditional behaviour + if ( mlt_properties_get_data( temp_properties, "global_queue", NULL ) != NULL ) + { + mlt_deque sub_queue = mlt_properties_get_data( MLT_FRAME_PROPERTIES( temp ), "global_queue", NULL ); + while ( mlt_deque_count( sub_queue ) ) + { + mlt_properties p = mlt_deque_pop_back( sub_queue ); + mlt_deque_push_back( data_queue, p ); + } + } + // Pick up first video and audio frames - if ( audio == NULL && !mlt_frame_is_test_audio( temp ) ) + if ( !done && !mlt_frame_is_test_audio( temp ) && !( mlt_properties_get_int( temp_properties, "hide" ) & 2 ) ) + { + // Order of frame creation is starting to get problematic + if ( audio != NULL ) + { + mlt_deque_push_front( MLT_FRAME_AUDIO_STACK( temp ), producer_get_audio ); + mlt_deque_push_front( MLT_FRAME_AUDIO_STACK( temp ), audio ); + } audio = temp; - if ( video == NULL && !mlt_frame_is_test_card( temp ) ) + } + if ( !done && !mlt_frame_is_test_card( temp ) && !( mlt_properties_get_int( temp_properties, "hide" ) & 1 ) ) + { + if ( video != NULL ) + { + mlt_deque_push_front( MLT_FRAME_IMAGE_STACK( temp ), producer_get_image ); + mlt_deque_push_front( MLT_FRAME_IMAGE_STACK( temp ), video ); + } video = temp; + if ( first_video == NULL ) + first_video = temp; + + mlt_properties_set_int( MLT_FRAME_PROPERTIES( temp ), "image_count", ++ image_count ); + image_count = 1; + } } - + // Now stack callbacks if ( audio != NULL ) { mlt_frame_push_audio( *frame, audio ); - ( *frame )->get_audio = producer_get_audio; - mlt_properties_inherit( mlt_frame_properties( *frame ), mlt_frame_properties( audio ) ); + mlt_frame_push_audio( *frame, producer_get_audio ); } if ( video != NULL ) { + mlt_properties video_properties = MLT_FRAME_PROPERTIES( first_video ); mlt_frame_push_service( *frame, video ); mlt_frame_push_service( *frame, producer_get_image ); - mlt_properties_inherit( mlt_frame_properties( *frame ), mlt_frame_properties( video ) ); + if ( global_feed ) + mlt_properties_set_data( frame_properties, "data_queue", data_queue, 0, NULL, NULL ); + mlt_properties_set_data( video_properties, "global_queue", data_queue, 0, destroy_data_queue, NULL ); + mlt_properties_set_int( frame_properties, "width", mlt_properties_get_int( video_properties, "width" ) ); + mlt_properties_set_int( frame_properties, "height", mlt_properties_get_int( video_properties, "height" ) ); + mlt_properties_pass_list( frame_properties, video_properties, "meta.media.width, meta.media.height" ); + mlt_properties_set_int( frame_properties, "progressive", mlt_properties_get_int( video_properties, "progressive" ) ); + mlt_properties_set_double( frame_properties, "aspect_ratio", mlt_properties_get_double( video_properties, "aspect_ratio" ) ); + mlt_properties_set_int( frame_properties, "image_count", image_count ); + } + else + { + destroy_data_queue( data_queue ); } + mlt_frame_set_position( *frame, mlt_producer_frame( parent ) ); + mlt_properties_set_int( MLT_FRAME_PROPERTIES( *frame ), "test_audio", audio == NULL ); + mlt_properties_set_int( MLT_FRAME_PROPERTIES( *frame ), "test_image", video == NULL ); } else if ( producer != NULL ) { mlt_producer_seek( producer, mlt_producer_frame( parent ) ); mlt_producer_set_speed( producer, mlt_producer_get_speed( parent ) ); - mlt_service_get_frame( this->producer, frame, track ); + mlt_service_get_frame( self->producer, frame, track ); } else { - fprintf( stderr, "tractor without a multitrack!!\n" ); - mlt_service_get_frame( this->producer, frame, track ); + mlt_log( MLT_PRODUCER_SERVICE( parent ), MLT_LOG_ERROR, "tractor without a multitrack!!\n" ); + mlt_service_get_frame( self->producer, frame, track ); } // Prepare the next frame @@ -242,26 +535,24 @@ static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int tra else { // Generate a test card - *frame = mlt_frame_init( ); + *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( parent ) ); return 0; } } -/** Close the tractor. -*/ - -void mlt_tractor_close( mlt_tractor this ) -{ - this->parent.close = NULL; - mlt_producer_close( &this->parent ); - free( this ); -} - -/** Close the producer. -*/ +/** Close the tractor and free its resources. + * + * \public \memberof mlt_tractor_s + * \param self a tractor + */ -static void producer_close( mlt_producer this ) +void mlt_tractor_close( mlt_tractor self ) { - mlt_tractor_close( this->child ); + if ( self != NULL && mlt_properties_dec_ref( MLT_TRACTOR_PROPERTIES( self ) ) <= 0 ) + { + self->parent.close = NULL; + mlt_producer_close( &self->parent ); + free( self ); + } }