-/*
- * mlt_multitrack.c -- multitrack service class
- * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
- * Author: Charles Yates <charles.yates@pandora.be>
+/**
+ * \file mlt_multitrack.c
+ * \brief multitrack service class
+ * \see mlt_multitrack_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 <charles.yates@pandora.be>
*
- * 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_multitrack.h"
#include "mlt_playlist.h"
#include "mlt_frame.h"
#include <stdio.h>
#include <stdlib.h>
-/** Private definition.
-*/
-
-struct mlt_multitrack_s
-{
- // We're extending producer here
- struct mlt_producer_s parent;
- mlt_producer *list;
- int size;
- int count;
-};
+/* Forward reference. */
-/** Forward reference.
-*/
+static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index );
-static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index );
-
-/** Constructor.
-*/
+/** 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 );
+ mlt_multitrack self = calloc( sizeof( struct mlt_multitrack_s ), 1 );
- if ( this != NULL )
+ 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 properties = mlt_multitrack_properties( this );
+ mlt_properties properties = MLT_MULTITRACK_PROPERTIES( self );
producer->get_frame = producer_get_frame;
- mlt_properties_set_data( properties, "multitrack", this, 0, NULL, NULL );
+ mlt_properties_set_data( properties, "multitrack", self, 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;
+ free( self );
+ self = NULL;
}
}
-
- return this;
+
+ return self;
}
/** Get the producer associated to this multitrack.
-*/
+ *
+ * \public \memberof mlt_multitrack_s
+ * \param self a multitrack
+ * \return the producer object
+ * \see MLT_MULTITRACK_PRODUCER
+ */
-mlt_producer mlt_multitrack_producer( mlt_multitrack this )
+mlt_producer mlt_multitrack_producer( mlt_multitrack self )
{
- return &this->parent;
+ return self != NULL ? &self->parent : NULL;
}
/** Get the service associated this multitrack.
-*/
+ *
+ * \public \memberof mlt_multitrack_s
+ * \param self a multitrack
+ * \return the service object
+ * \see MLT_MULTITRACK_SERVICE
+ */
-mlt_service mlt_multitrack_service( mlt_multitrack this )
+mlt_service mlt_multitrack_service( mlt_multitrack self )
{
- return mlt_producer_service( mlt_multitrack_producer( this ) );
+ return MLT_MULTITRACK_SERVICE( self );
}
/** Get the properties associated this multitrack.
-*/
+ *
+ * \public \memberof mlt_multitrack_s
+ * \param self a multitrack
+ * \return the multitrack's property list
+ * \see MLT_MULTITRACK_PROPERTIES
+ */
-mlt_properties mlt_multitrack_properties( mlt_multitrack this )
+mlt_properties mlt_multitrack_properties( mlt_multitrack self )
{
- return mlt_service_properties( mlt_multitrack_service( this ) );
+ return MLT_MULTITRACK_PROPERTIES( self );
}
-/** Initialise timecode related information.
-*/
+/** Initialize position related information.
+ *
+ * \public \memberof mlt_multitrack_s
+ * \param self a multitrack
+ */
-void mlt_multitrack_refresh( mlt_multitrack this )
+void mlt_multitrack_refresh( mlt_multitrack self )
{
int i = 0;
// Obtain the properties of this multitrack
- mlt_properties properties = mlt_multitrack_properties( this );
+ mlt_properties properties = MLT_MULTITRACK_PROPERTIES( self );
// We need to ensure that the multitrack reports the longest track as its length
- mlt_timecode length = 0;
+ mlt_position length = 0;
- // We need to ensure that fps are the same on all services
- double fps = 0;
-
// Obtain stats on all connected services
- for ( i = 0; i < this->count; i ++ )
+ for ( i = 0; i < self->count; i ++ )
{
// Get the producer from this index
- mlt_producer producer = this->list[ i ];
+ mlt_track track = self->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
- length = mlt_producer_get_playtime( producer ) > length ? mlt_producer_get_playtime( producer ) : length;
-
- // Handle fps
- if ( fps == 0 )
- {
- // This is the first producer, so it controls the fps
- fps = mlt_producer_get_fps( producer );
- }
- else if ( fps != mlt_producer_get_fps( producer ) )
- {
- // Generate a warning for now - the following attempt to fix may fail
- fprintf( stderr, "Warning: fps mismatch on track %d\n", i );
+ if ( self->count > 1 )
+ mlt_properties_set( MLT_PRODUCER_PROPERTIES( producer ), "eof", "continue" );
- // It should be safe to impose fps on an image producer, but not necessarily safe for video
- mlt_properties_set_double( mlt_producer_properties( producer ), "fps", fps );
- }
+ // 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_properties_set_timecode( properties, "length", length );
- mlt_properties_set_timecode( properties, "out", length );
- mlt_properties_set_double( properties, "fps", fps );
+ 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 );
}
-/** Connect a producer to a given track.
+/** Listener for producers on the playlist.
+ *
+ * \private \memberof mlt_multitrack_s
+ * \param producer a producer
+ * \param self a multitrack
+ */
+
+static void mlt_multitrack_listener( mlt_producer producer, mlt_multitrack self )
+{
+ mlt_multitrack_refresh( self );
+}
- Note that any producer can be connected here, but see special case treatment
- of playlist in clip point determination below.
-*/
+/** 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 self 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 )
+int mlt_multitrack_connect( mlt_multitrack self, 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 );
+ int result = mlt_service_connect_producer( MLT_MULTITRACK_SERVICE( self ), MLT_PRODUCER_SERVICE( producer ), track );
if ( result == 0 )
{
// Resize the producer list if need be
- if ( track >= this->size )
+ if ( track >= self->size )
{
int i;
- this->list = realloc( this->list, ( track + 10 ) * sizeof( mlt_producer ) );
- for ( i = this->size; i < track + 10; i ++ )
- this->list[ i ] = NULL;
- this->size = track + 10;
+ self->list = realloc( self->list, ( track + 10 ) * sizeof( mlt_track ) );
+ for ( i = self->size; i < track + 10; i ++ )
+ self->list[ i ] = NULL;
+ self->size = track + 10;
+ }
+
+ if ( self->list[ track ] != NULL )
+ {
+ mlt_event_close( self->list[ track ]->event );
+ mlt_producer_close( self->list[ track ]->producer );
}
-
+ else
+ {
+ self->list[ track ] = malloc( sizeof( struct mlt_track_s ) );
+ }
+
// Assign the track in our list here
- this->list[ track ] = producer;
-
+ self->list[ track ]->producer = producer;
+ self->list[ track ]->event = mlt_events_listen( MLT_PRODUCER_PROPERTIES( producer ), self,
+ "producer-changed", ( mlt_listener )mlt_multitrack_listener );
+ mlt_properties_inc_ref( MLT_PRODUCER_PROPERTIES( producer ) );
+ mlt_event_inc_ref( self->list[ track ]->event );
+
// Increment the track count if need be
- if ( track >= this->count )
- this->count = track + 1;
-
+ if ( track >= self->count )
+ self->count = track + 1;
+
// Refresh our stats
- mlt_multitrack_refresh( this );
+ mlt_multitrack_refresh( self );
}
return result;
}
-/** Determine the clip point.
+/** Get the number of tracks.
+ *
+ * \public \memberof mlt_multitrack_s
+ * \param self a multitrack
+ * \return the number of tracks
+ */
+
+int mlt_multitrack_count( mlt_multitrack self )
+{
+ return self->count;
+}
+
+/** Get an individual track as a producer.
+ *
+ * \public \memberof mlt_multitrack_s
+ * \param self 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 self, int track )
+{
+ mlt_producer producer = NULL;
+
+ if ( self->list != NULL && track < self->count )
+ producer = self->list[ track ]->producer;
- 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.
+ return producer;
+}
- Additionally, it must locate clips in the correct order, for example, consider
- the following track arrangement:
+/** 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
+ */
- playlist1 |0.0 |b0.0 |0.1 |0.1 |0.2 |
- playlist2 |b1.0 |1.0 |b1.1 |1.1 |
+static int position_compare( const void *p1, const void *p2 )
+{
+ return *( const mlt_position * )p1 - *( const mlt_position * )p2;
+}
- Note - b clips represent blanks. They are also reported as clip positions.
+/** 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
+ */
- When extracting clip positions from these playlists, we should get a sequence of:
+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;
+}
- 0.0, 1.0, b0.0, 0.1, b1.1, 1.1, 0.1, 0.2, [out of playlist2], [out of playlist1]
-*/
+/** 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 self 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_timecode mlt_multitrack_clip( mlt_multitrack this, mlt_whence whence, int index )
+mlt_position mlt_multitrack_clip( mlt_multitrack self, mlt_whence whence, int index )
{
- int first = 1;
- mlt_timecode position = 0;
+ mlt_position position = 0;
int i = 0;
+ int j = 0;
+ mlt_position *map = malloc( 1000 * sizeof( mlt_position ) );
+ int count = 0;
- // Loop through each of the tracks
- for ( i = 0; i < this->count; i ++ )
+ for ( i = 0; i < self->count; i ++ )
{
// Get the producer for this track
- mlt_producer producer = this->list[ i ];
+ mlt_producer producer = self->list[ i ]->producer;
- // If it's assigned...
+ // 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 );
+ mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
// Determine if it's a playlist
mlt_playlist playlist = mlt_properties_get_data( properties, "playlist", NULL );
- // We only consider playlists
+ // Special case consideration of playlists
if ( playlist != NULL )
{
- // Locate the smallest timecode
- if ( first )
- {
- // First position found
- position = mlt_playlist_clip( playlist, whence, index );
-
- // We're no longer first
- first = 0;
- }
- else
- {
- // Obtain the clip position in this playlist
- mlt_timecode position2 = mlt_playlist_clip( playlist, whence, index );
-
- // If this position is prior to the first, then use it
- if ( position2 < position )
- position = position2;
- }
+ 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 );
}
}
}
- return position;
-}
-
-/** Get frame method.
-
- 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 /
+ // Now sort the map
+ qsort( map, count, sizeof( mlt_position ), position_compare );
- 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.
+ // 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( self ) );
+ 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;
+ }
- 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.
+ // Free the map
+ free( map );
- 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.
+ return position;
+}
- See playlist logic too.
-*/
+/** 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;
+ mlt_multitrack self = parent->child;
// Check if we have a track for this index
- if ( index < this->count && this->list[ index ] != NULL )
+ if ( index < self->count && self->list[ index ] != NULL )
{
// Get the producer for this track
- mlt_producer producer = this->list[ index ];
+ mlt_producer producer = self->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 timecode
- uint64_t position = mlt_producer_frame( parent );
+ // 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_frame( producer, position );
+ mlt_producer_seek( producer, position );
// Get the frame from the producer
- mlt_service_get_frame( mlt_producer_service( producer ), frame, 0 );
+ mlt_service_get_frame( MLT_PRODUCER_SERVICE( producer ), frame, 0 );
// Indicate speed of this producer
- mlt_properties producer_properties = mlt_producer_properties( parent );
- double speed = mlt_properties_get_double( producer_properties, "speed" );
- mlt_properties properties = mlt_frame_properties( *frame );
- mlt_properties_set_double( properties, "speed", speed );
+ mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
+ mlt_properties_set_double( properties, "_speed", speed );
+ mlt_frame_set_position( *frame, position );
+ mlt_properties_set_int( properties, "hide", hide );
}
else
{
// Generate a test frame
- *frame = mlt_frame_init( );
+ *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( parent ) );
- // Update timecode on the frame we're creating
- mlt_frame_set_timecode( *frame, mlt_producer_position( 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 )
+ if ( index >= self->count )
{
// Let tractor know if we've reached the end
- mlt_properties_set_int( mlt_frame_properties( *frame ), "last_track", 1 );
+ mlt_properties_set_int( MLT_FRAME_PROPERTIES( *frame ), "last_track", 1 );
// Move to the next frame
mlt_producer_prepare_next( parent );
}
-
- // Refresh our stats
- mlt_multitrack_refresh( this );
}
return 0;
}
-/** Close this instance.
-*/
+/** Close this instance and free its resources.
+ *
+ * \public \memberof mlt_multitrack_s
+ * \param self a multitrack
+ */
-void mlt_multitrack_close( mlt_multitrack this )
+void mlt_multitrack_close( mlt_multitrack self )
{
- // Close the producer
- mlt_producer_close( &this->parent );
+ if ( self != NULL && mlt_properties_dec_ref( MLT_MULTITRACK_PROPERTIES( self ) ) <= 0 )
+ {
+ int i = 0;
+ for ( i = 0; i < self->count; i ++ )
+ {
+ if ( self->list[ i ] != NULL )
+ {
+ mlt_event_close( self->list[ i ]->event );
+ mlt_producer_close( self->list[ i ]->producer );
+ free( self->list[ i ] );
+ }
+ }
+
+ // Close the producer
+ self->parent.close = NULL;
+ mlt_producer_close( &self->parent );
- // Free the list
- free( this->list );
+ // Free the list
+ free( self->list );
- // Free the object
- free( this );
+ // Free the object
+ free( self );
+ }
}
projects / mlt / blobdiff