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437 lines
12 KiB
437 lines
12 KiB
15 years ago
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/*
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* mlt_multitrack.c -- multitrack service class
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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_multitrack.h"
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#include "mlt_playlist.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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/** Forward reference.
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*/
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static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index );
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/** Constructor.
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*/
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mlt_multitrack mlt_multitrack_init( )
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{
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// Allocate the multitrack object
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mlt_multitrack this = calloc( sizeof( struct mlt_multitrack_s ), 1 );
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if ( this != NULL )
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{
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mlt_producer producer = &this->parent;
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if ( mlt_producer_init( producer, this ) == 0 )
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{
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mlt_properties properties = MLT_MULTITRACK_PROPERTIES( this );
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producer->get_frame = producer_get_frame;
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mlt_properties_set_data( properties, "multitrack", this, 0, NULL, NULL );
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mlt_properties_set( properties, "log_id", "multitrack" );
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mlt_properties_set( properties, "resource", "<multitrack>" );
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mlt_properties_set_int( properties, "in", 0 );
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mlt_properties_set_int( properties, "out", -1 );
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mlt_properties_set_int( properties, "length", 0 );
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producer->close = ( mlt_destructor )mlt_multitrack_close;
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}
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else
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{
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free( this );
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this = NULL;
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}
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}
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return this;
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}
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/** Get the producer associated to this multitrack.
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*/
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mlt_producer mlt_multitrack_producer( mlt_multitrack 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 service associated this multitrack.
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*/
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mlt_service mlt_multitrack_service( mlt_multitrack this )
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{
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return MLT_MULTITRACK_SERVICE( this );
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}
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/** Get the properties associated this multitrack.
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*/
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mlt_properties mlt_multitrack_properties( mlt_multitrack this )
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{
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return MLT_MULTITRACK_PROPERTIES( this );
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}
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/** Initialise position related information.
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*/
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void mlt_multitrack_refresh( mlt_multitrack this )
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{
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int i = 0;
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// Obtain the properties of this multitrack
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mlt_properties properties = MLT_MULTITRACK_PROPERTIES( this );
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// We need to ensure that the multitrack reports the longest track as its length
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mlt_position length = 0;
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// Obtain stats on all connected services
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for ( i = 0; i < this->count; i ++ )
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{
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// Get the producer from this index
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mlt_track track = this->list[ i ];
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mlt_producer producer = track->producer;
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// If it's allocated then, update our stats
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if ( producer != NULL )
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{
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// If we have more than 1 track, we must be in continue mode
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if ( this->count > 1 )
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mlt_properties_set( MLT_PRODUCER_PROPERTIES( producer ), "eof", "continue" );
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// Determine the longest length
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//if ( !mlt_properties_get_int( MLT_PRODUCER_PROPERTIES( producer ), "hide" ) )
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length = mlt_producer_get_playtime( producer ) > length ? mlt_producer_get_playtime( producer ) : length;
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}
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}
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// Update multitrack properties now - we'll not destroy the in point here
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mlt_events_block( properties, properties );
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mlt_properties_set_position( properties, "length", length );
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mlt_events_unblock( properties, properties );
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mlt_properties_set_position( properties, "out", length - 1 );
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}
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/** Listener for producers on the playlist.
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*/
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static void mlt_multitrack_listener( mlt_producer producer, mlt_multitrack this )
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{
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mlt_multitrack_refresh( this );
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}
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/** Connect a producer to a given track.
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Note that any producer can be connected here, but see special case treatment
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of playlist in clip point determination below.
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*/
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int mlt_multitrack_connect( mlt_multitrack this, mlt_producer producer, int track )
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{
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// Connect to the producer to ourselves at the specified track
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int result = mlt_service_connect_producer( MLT_MULTITRACK_SERVICE( this ), MLT_PRODUCER_SERVICE( producer ), track );
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if ( result == 0 )
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{
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// Resize the producer list if need be
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if ( track >= this->size )
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{
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int i;
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this->list = realloc( this->list, ( track + 10 ) * sizeof( mlt_track ) );
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for ( i = this->size; i < track + 10; i ++ )
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this->list[ i ] = NULL;
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this->size = track + 10;
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}
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if ( this->list[ track ] != NULL )
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{
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mlt_event_close( this->list[ track ]->event );
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mlt_producer_close( this->list[ track ]->producer );
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}
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else
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{
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this->list[ track ] = malloc( sizeof( struct mlt_track_s ) );
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}
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// Assign the track in our list here
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this->list[ track ]->producer = producer;
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this->list[ track ]->event = mlt_events_listen( MLT_PRODUCER_PROPERTIES( producer ), this,
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"producer-changed", ( mlt_listener )mlt_multitrack_listener );
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mlt_properties_inc_ref( MLT_PRODUCER_PROPERTIES( producer ) );
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mlt_event_inc_ref( this->list[ track ]->event );
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// Increment the track count if need be
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if ( track >= this->count )
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this->count = track + 1;
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// Refresh our stats
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mlt_multitrack_refresh( this );
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}
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return result;
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}
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/** Get the number of tracks.
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*/
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int mlt_multitrack_count( mlt_multitrack this )
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{
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return this->count;
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}
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/** Get an individual track as a producer.
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*/
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mlt_producer mlt_multitrack_track( mlt_multitrack this, int track )
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{
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mlt_producer producer = NULL;
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if ( this->list != NULL && track < this->count )
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producer = this->list[ track ]->producer;
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return producer;
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}
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static int position_compare( const void *p1, const void *p2 )
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{
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return *( mlt_position * )p1 - *( mlt_position * )p2;
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}
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static int add_unique( mlt_position *array, int size, mlt_position position )
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{
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int i = 0;
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for ( i = 0; i < size; i ++ )
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if ( array[ i ] == position )
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break;
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if ( i == size )
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array[ size ++ ] = position;
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return size;
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}
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/** Determine the clip point.
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Special case here: a 'producer' has no concept of multiple clips - only the
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playlist and multitrack producers have clip functionality. Further to that a
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multitrack determines clip information from any connected tracks that happen
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to be playlists.
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Additionally, it must locate clips in the correct order, for example, consider
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the following track arrangement:
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playlist1 |0.0 |b0.0 |0.1 |0.1 |0.2 |
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playlist2 |b1.0 |1.0 |b1.1 |1.1 |
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Note - b clips represent blanks. They are also reported as clip positions.
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When extracting clip positions from these playlists, we should get a sequence of:
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0.0, 1.0, b0.0, 0.1, b1.1, 1.1, 0.1, 0.2, [out of playlist2], [out of playlist1]
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*/
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mlt_position mlt_multitrack_clip( mlt_multitrack this, mlt_whence whence, int index )
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{
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mlt_position position = 0;
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int i = 0;
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int j = 0;
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mlt_position *map = malloc( 1000 * sizeof( mlt_position ) );
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int count = 0;
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for ( i = 0; i < this->count; i ++ )
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{
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// Get the producer for this track
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mlt_producer producer = this->list[ i ]->producer;
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// If it's assigned and not a hidden track
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if ( producer != NULL )
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{
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// Get the properties of this producer
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mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
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// Determine if it's a playlist
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mlt_playlist playlist = mlt_properties_get_data( properties, "playlist", NULL );
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// Special case consideration of playlists
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if ( playlist != NULL )
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{
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for ( j = 0; j < mlt_playlist_count( playlist ); j ++ )
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count = add_unique( map, count, mlt_playlist_clip( playlist, mlt_whence_relative_start, j ) );
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count = add_unique( map, count, mlt_producer_get_out( producer ) + 1 );
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}
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else
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{
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count = add_unique( map, count, 0 );
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count = add_unique( map, count, mlt_producer_get_out( producer ) + 1 );
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}
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}
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}
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// Now sort the map
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qsort( map, count, sizeof( mlt_position ), position_compare );
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// Now locate the requested index
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switch( whence )
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{
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case mlt_whence_relative_start:
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if ( index < count )
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position = map[ index ];
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else
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position = map[ count - 1 ];
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break;
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case mlt_whence_relative_current:
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position = mlt_producer_position( MLT_MULTITRACK_PRODUCER( this ) );
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for ( i = 0; i < count - 2; i ++ )
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if ( position >= map[ i ] && position < map[ i + 1 ] )
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break;
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index += i;
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if ( index >= 0 && index < count )
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position = map[ index ];
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else if ( index < 0 )
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position = map[ 0 ];
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else
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position = map[ count - 1 ];
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break;
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case mlt_whence_relative_end:
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if ( index < count )
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position = map[ count - index - 1 ];
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else
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position = map[ 0 ];
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break;
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}
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// Free the map
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free( map );
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return position;
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}
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/** Get frame method.
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Special case here: The multitrack must be used in a conjunction with a downstream
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tractor-type service, ie:
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Producer1 \
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Producer2 - multitrack - { filters/transitions } - tractor - consumer
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Producer3 /
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The get_frame of a tractor pulls frames from it's connected service on all tracks and
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will terminate as soon as it receives a test card with a last_track property. The
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important case here is that the mulitrack does not move to the next frame until all
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tracks have been pulled.
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Reasoning: In order to seek on a network such as above, the multitrack needs to ensure
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that all producers are positioned on the same frame. It uses the 'last track' logic
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to determine when to move to the next frame.
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Flaw: if a transition is configured to read from a b-track which happens to trigger
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the last frame logic (ie: it's configured incorrectly), then things are going to go
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out of sync.
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See playlist logic too.
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*/
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static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index )
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{
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// Get the mutiltrack object
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mlt_multitrack this = parent->child;
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// Check if we have a track for this index
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if ( index < this->count && this->list[ index ] != NULL )
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{
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// Get the producer for this track
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mlt_producer producer = this->list[ index ]->producer;
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// Get the track hide property
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int hide = mlt_properties_get_int( MLT_PRODUCER_PROPERTIES( mlt_producer_cut_parent( producer ) ), "hide" );
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// Obtain the current position
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mlt_position position = mlt_producer_frame( parent );
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// Get the parent properties
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mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES( parent );
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// Get the speed
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double speed = mlt_properties_get_double( producer_properties, "_speed" );
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// Make sure we're at the same point
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mlt_producer_seek( producer, position );
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// Get the frame from the producer
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mlt_service_get_frame( MLT_PRODUCER_SERVICE( producer ), frame, 0 );
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// Indicate speed of this producer
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mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
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mlt_properties_set_double( properties, "_speed", speed );
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mlt_properties_set_position( properties, "_position", position );
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mlt_properties_set_int( properties, "hide", hide );
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}
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else
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{
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// Generate a test frame
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*frame = mlt_frame_init( );
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// Update position on the frame we're creating
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mlt_frame_set_position( *frame, mlt_producer_position( parent ) );
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// Move on to the next frame
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if ( index >= this->count )
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{
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// Let tractor know if we've reached the end
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mlt_properties_set_int( MLT_FRAME_PROPERTIES( *frame ), "last_track", 1 );
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// Move to the next frame
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mlt_producer_prepare_next( parent );
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}
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}
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return 0;
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}
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/** Close this instance.
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*/
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void mlt_multitrack_close( mlt_multitrack this )
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{
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if ( this != NULL && mlt_properties_dec_ref( MLT_MULTITRACK_PROPERTIES( this ) ) <= 0 )
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{
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int i = 0;
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for ( i = 0; i < this->count; i ++ )
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{
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if ( this->list[ i ] != NULL )
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{
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mlt_event_close( this->list[ i ]->event );
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mlt_producer_close( this->list[ i ]->producer );
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free( this->list[ i ] );
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}
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}
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// Close the producer
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this->parent.close = NULL;
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mlt_producer_close( &this->parent );
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// Free the list
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free( this->list );
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// Free the object
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free( this );
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}
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}
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