+++ /dev/null
-/**
- * \file mlt_multitrack.c
- * \brief multitrack service class
- * \see mlt_multitrack_s
- *
- * Copyright (C) 2003-2009 Ushodaya Enterprises Limited
- * \author Charles Yates <charles.yates@pandora.be>
- *
- * 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
- * Lesser General Public License for more details.
- *
- * 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 "mlt_multitrack.h"
-#include "mlt_playlist.h"
-#include "mlt_frame.h"
-
-#include <stdio.h>
-#include <stdlib.h>
-
-/* Forward reference. */
-
-static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index );
-
-/** Construct and initialize a new multitrack.
- *
- * Sets the resource property to "<multitrack>".
- *
- * \public \memberof mlt_multitrack_s
- * \return a new multitrack
- */
-
-mlt_multitrack mlt_multitrack_init( )
-{
- // Allocate the multitrack object
- mlt_multitrack this = calloc( sizeof( struct mlt_multitrack_s ), 1 );
-
- if ( this != NULL )
- {
- mlt_producer producer = &this->parent;
- if ( mlt_producer_init( producer, this ) == 0 )
- {
- mlt_properties properties = MLT_MULTITRACK_PROPERTIES( this );
- producer->get_frame = producer_get_frame;
- mlt_properties_set_data( properties, "multitrack", this, 0, NULL, NULL );
- mlt_properties_set( properties, "log_id", "multitrack" );
- mlt_properties_set( properties, "resource", "<multitrack>" );
- mlt_properties_set_int( properties, "in", 0 );
- mlt_properties_set_int( properties, "out", -1 );
- mlt_properties_set_int( properties, "length", 0 );
- producer->close = ( mlt_destructor )mlt_multitrack_close;
- }
- else
- {
- free( this );
- this = NULL;
- }
- }
-
- return this;
-}
-
-/** Get the producer associated to this multitrack.
- *
- * \public \memberof mlt_multitrack_s
- * \param this a multitrack
- * \return the producer object
- * \see MLT_MULTITRACK_PRODUCER
- */
-
-mlt_producer mlt_multitrack_producer( mlt_multitrack this )
-{
- return this != NULL ? &this->parent : NULL;
-}
-
-/** Get the service associated this multitrack.
- *
- * \public \memberof mlt_multitrack_s
- * \param this a multitrack
- * \return the service object
- * \see MLT_MULTITRACK_SERVICE
- */
-
-mlt_service mlt_multitrack_service( mlt_multitrack this )
-{
- return MLT_MULTITRACK_SERVICE( this );
-}
-
-/** Get the properties associated this multitrack.
- *
- * \public \memberof mlt_multitrack_s
- * \param this a multitrack
- * \return the multitrack's property list
- * \see MLT_MULTITRACK_PROPERTIES
- */
-
-mlt_properties mlt_multitrack_properties( mlt_multitrack this )
-{
- return MLT_MULTITRACK_PROPERTIES( this );
-}
-
-/** Initialize position related information.
- *
- * \public \memberof mlt_multitrack_s
- * \param this a multitrack
- */
-
-void mlt_multitrack_refresh( mlt_multitrack this )
-{
- int i = 0;
-
- // Obtain the properties of this multitrack
- mlt_properties properties = MLT_MULTITRACK_PROPERTIES( this );
-
- // We need to ensure that the multitrack reports the longest track as its length
- mlt_position length = 0;
-
- // Obtain stats on all connected services
- for ( i = 0; i < this->count; i ++ )
- {
- // Get the producer from this index
- mlt_track track = this->list[ i ];
- mlt_producer producer = track->producer;
-
- // If it's allocated then, update our stats
- if ( producer != NULL )
- {
- // If we have more than 1 track, we must be in continue mode
- if ( this->count > 1 )
- mlt_properties_set( MLT_PRODUCER_PROPERTIES( producer ), "eof", "continue" );
-
- // Determine the longest length
- //if ( !mlt_properties_get_int( MLT_PRODUCER_PROPERTIES( producer ), "hide" ) )
- length = mlt_producer_get_playtime( producer ) > length ? mlt_producer_get_playtime( producer ) : length;
- }
- }
-
- // Update multitrack properties now - we'll not destroy the in point here
- mlt_events_block( properties, properties );
- mlt_properties_set_position( properties, "length", length );
- mlt_events_unblock( properties, properties );
- mlt_properties_set_position( properties, "out", length - 1 );
-}
-
-/** Listener for producers on the playlist.
- *
- * \private \memberof mlt_multitrack_s
- * \param producer a producer
- * \param this a multitrack
- */
-
-static void mlt_multitrack_listener( mlt_producer producer, mlt_multitrack this )
-{
- mlt_multitrack_refresh( this );
-}
-
-/** Connect a producer to a given track.
- *
- * Note that any producer can be connected here, but see special case treatment
- * of playlist in clip point determination below.
- *
- * \public \memberof mlt_multitrack_s
- * \param this a multitrack
- * \param producer the producer to connect to the multitrack producer
- * \param track the 0-based index of the track on which to connect the multitrack
- * \return true on error
- */
-
-int mlt_multitrack_connect( mlt_multitrack this, mlt_producer producer, int track )
-{
- // Connect to the producer to ourselves at the specified track
- int result = mlt_service_connect_producer( MLT_MULTITRACK_SERVICE( this ), MLT_PRODUCER_SERVICE( producer ), track );
-
- if ( result == 0 )
- {
- // Resize the producer list if need be
- if ( track >= this->size )
- {
- int i;
- this->list = realloc( this->list, ( track + 10 ) * sizeof( mlt_track ) );
- for ( i = this->size; i < track + 10; i ++ )
- this->list[ i ] = NULL;
- this->size = track + 10;
- }
-
- if ( this->list[ track ] != NULL )
- {
- mlt_event_close( this->list[ track ]->event );
- mlt_producer_close( this->list[ track ]->producer );
- }
- else
- {
- this->list[ track ] = malloc( sizeof( struct mlt_track_s ) );
- }
-
- // Assign the track in our list here
- this->list[ track ]->producer = producer;
- this->list[ track ]->event = mlt_events_listen( MLT_PRODUCER_PROPERTIES( producer ), this,
- "producer-changed", ( mlt_listener )mlt_multitrack_listener );
- mlt_properties_inc_ref( MLT_PRODUCER_PROPERTIES( producer ) );
- mlt_event_inc_ref( this->list[ track ]->event );
-
- // Increment the track count if need be
- if ( track >= this->count )
- this->count = track + 1;
-
- // Refresh our stats
- mlt_multitrack_refresh( this );
- }
-
- return result;
-}
-
-/** Get the number of tracks.
- *
- * \public \memberof mlt_multitrack_s
- * \param this a multitrack
- * \return the number of tracks
- */
-
-int mlt_multitrack_count( mlt_multitrack this )
-{
- return this->count;
-}
-
-/** Get an individual track as a producer.
- *
- * \public \memberof mlt_multitrack_s
- * \param this a multitrack
- * \param track the 0-based index of the producer to get
- * \return the producer or NULL if not valid
- */
-
-mlt_producer mlt_multitrack_track( mlt_multitrack this, int track )
-{
- mlt_producer producer = NULL;
-
- if ( this->list != NULL && track < this->count )
- producer = this->list[ track ]->producer;
-
- return producer;
-}
-
-/** Position comparison function for sorting.
- *
- * \private \memberof mlt_multitrack_s
- * \param p1 a position
- * \param p2 another position
- * \return <0 if \p p1 is less than \p p2, 0 if equal, >0 if greater
- */
-
-static int position_compare( const void *p1, const void *p2 )
-{
- return *( const mlt_position * )p1 - *( const mlt_position * )p2;
-}
-
-/** Add a position to a set.
- *
- * \private \memberof mlt_multitrack_s
- * \param array an array of positions (the set)
- * \param size the current number of positions in the array (not the capacity of the array)
- * \param position the position to add
- * \return the new size of the array
- */
-
-static int add_unique( mlt_position *array, int size, mlt_position position )
-{
- int i = 0;
- for ( i = 0; i < size; i ++ )
- if ( array[ i ] == position )
- break;
- if ( i == size )
- array[ size ++ ] = position;
- return size;
-}
-
-/** Determine the clip point.
- *
- * <pre>
- * Special case here: a 'producer' has no concept of multiple clips - only the
- * playlist and multitrack producers have clip functionality. Further to that a
- * multitrack determines clip information from any connected tracks that happen
- * to be playlists.
- *
- * Additionally, it must locate clips in the correct order, for example, consider
- * the following track arrangement:
- *
- * playlist1 |0.0 |b0.0 |0.1 |0.1 |0.2 |
- * playlist2 |b1.0 |1.0 |b1.1 |1.1 |
- *
- * Note - b clips represent blanks. They are also reported as clip positions.
- *
- * When extracting clip positions from these playlists, we should get a sequence of:
- *
- * 0.0, 1.0, b0.0, 0.1, b1.1, 1.1, 0.1, 0.2, [out of playlist2], [out of playlist1]
- * </pre>
- *
- * \public \memberof mlt_multitrack_s
- * \param this a multitrack
- * \param whence from where to extract
- * \param index the 0-based index of which clip to extract
- * \return the position of clip \p index relative to \p whence
- */
-
-mlt_position mlt_multitrack_clip( mlt_multitrack this, mlt_whence whence, int index )
-{
- mlt_position position = 0;
- int i = 0;
- int j = 0;
- mlt_position *map = malloc( 1000 * sizeof( mlt_position ) );
- int count = 0;
-
- for ( i = 0; i < this->count; i ++ )
- {
- // Get the producer for this track
- mlt_producer producer = this->list[ i ]->producer;
-
- // If it's assigned and not a hidden track
- if ( producer != NULL )
- {
- // Get the properties of this producer
- mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
-
- // Determine if it's a playlist
- mlt_playlist playlist = mlt_properties_get_data( properties, "playlist", NULL );
-
- // Special case consideration of playlists
- if ( playlist != NULL )
- {
- for ( j = 0; j < mlt_playlist_count( playlist ); j ++ )
- count = add_unique( map, count, mlt_playlist_clip( playlist, mlt_whence_relative_start, j ) );
- count = add_unique( map, count, mlt_producer_get_out( producer ) + 1 );
- }
- else
- {
- count = add_unique( map, count, 0 );
- count = add_unique( map, count, mlt_producer_get_out( producer ) + 1 );
- }
- }
- }
-
- // Now sort the map
- qsort( map, count, sizeof( mlt_position ), position_compare );
-
- // Now locate the requested index
- switch( whence )
- {
- case mlt_whence_relative_start:
- if ( index < count )
- position = map[ index ];
- else
- position = map[ count - 1 ];
- break;
-
- case mlt_whence_relative_current:
- position = mlt_producer_position( MLT_MULTITRACK_PRODUCER( this ) );
- for ( i = 0; i < count - 2; i ++ )
- if ( position >= map[ i ] && position < map[ i + 1 ] )
- break;
- index += i;
- if ( index >= 0 && index < count )
- position = map[ index ];
- else if ( index < 0 )
- position = map[ 0 ];
- else
- position = map[ count - 1 ];
- break;
-
- case mlt_whence_relative_end:
- if ( index < count )
- position = map[ count - index - 1 ];
- else
- position = map[ 0 ];
- break;
- }
-
- // Free the map
- free( map );
-
- return position;
-}
-
-/** Get frame method.
- *
- * <pre>
- * Special case here: The multitrack must be used in a conjunction with a downstream
- * tractor-type service, ie:
- *
- * Producer1 \
- * Producer2 - multitrack - { filters/transitions } - tractor - consumer
- * Producer3 /
- *
- * The get_frame of a tractor pulls frames from it's connected service on all tracks and
- * will terminate as soon as it receives a test card with a last_track property. The
- * important case here is that the mulitrack does not move to the next frame until all
- * tracks have been pulled.
- *
- * Reasoning: In order to seek on a network such as above, the multitrack needs to ensure
- * that all producers are positioned on the same frame. It uses the 'last track' logic
- * to determine when to move to the next frame.
- *
- * Flaw: if a transition is configured to read from a b-track which happens to trigger
- * the last frame logic (ie: it's configured incorrectly), then things are going to go
- * out of sync.
- *
- * See playlist logic too.
- * </pre>
- *
- * \private \memberof mlt_multitrack_s
- * \param parent the producer interface to a mulitrack
- * \param[out] frame a frame by reference
- * \param index the 0-based track index
- * \return true if there was an error
- */
-
-static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index )
-{
- // Get the mutiltrack object
- mlt_multitrack this = parent->child;
-
- // Check if we have a track for this index
- if ( index < this->count && this->list[ index ] != NULL )
- {
- // Get the producer for this track
- mlt_producer producer = this->list[ index ]->producer;
-
- // Get the track hide property
- int hide = mlt_properties_get_int( MLT_PRODUCER_PROPERTIES( mlt_producer_cut_parent( producer ) ), "hide" );
-
- // Obtain the current position
- mlt_position position = mlt_producer_frame( parent );
-
- // Get the parent properties
- mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES( parent );
-
- // Get the speed
- double speed = mlt_properties_get_double( producer_properties, "_speed" );
-
- // Make sure we're at the same point
- mlt_producer_seek( producer, position );
-
- // Get the frame from the producer
- mlt_service_get_frame( MLT_PRODUCER_SERVICE( producer ), frame, 0 );
-
- // Indicate speed of this producer
- mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
- mlt_properties_set_double( properties, "_speed", speed );
- mlt_properties_set_position( properties, "_position", position );
- mlt_properties_set_int( properties, "hide", hide );
- }
- else
- {
- // Generate a test frame
- *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( parent ) );
-
- // Update position on the frame we're creating
- mlt_frame_set_position( *frame, mlt_producer_position( parent ) );
-
- // Move on to the next frame
- if ( index >= this->count )
- {
- // Let tractor know if we've reached the end
- mlt_properties_set_int( MLT_FRAME_PROPERTIES( *frame ), "last_track", 1 );
-
- // Move to the next frame
- mlt_producer_prepare_next( parent );
- }
- }
-
- return 0;
-}
-
-/** Close this instance and free its resources.
- *
- * \public \memberof mlt_multitrack_s
- * \param this a multitrack
- */
-
-void mlt_multitrack_close( mlt_multitrack this )
-{
- if ( this != NULL && mlt_properties_dec_ref( MLT_MULTITRACK_PROPERTIES( this ) ) <= 0 )
- {
- int i = 0;
- for ( i = 0; i < this->count; i ++ )
- {
- if ( this->list[ i ] != NULL )
- {
- mlt_event_close( this->list[ i ]->event );
- mlt_producer_close( this->list[ i ]->producer );
- free( this->list[ i ] );
- }
- }
-
- // Close the producer
- this->parent.close = NULL;
- mlt_producer_close( &this->parent );
-
- // Free the list
- free( this->list );
-
- // Free the object
- free( this );
- }
-}
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