You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
437 lines
12 KiB
437 lines
12 KiB
/*
|
|
* mlt_multitrack.c -- multitrack service class
|
|
* Copyright (C) 2003-2004 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#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 parent, mlt_frame_ptr frame, int index );
|
|
|
|
/** Constructor.
|
|
*/
|
|
|
|
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.
|
|
*/
|
|
|
|
mlt_producer mlt_multitrack_producer( mlt_multitrack this )
|
|
{
|
|
return this != NULL ? &this->parent : NULL;
|
|
}
|
|
|
|
/** Get the service associated this multitrack.
|
|
*/
|
|
|
|
mlt_service mlt_multitrack_service( mlt_multitrack this )
|
|
{
|
|
return MLT_MULTITRACK_SERVICE( this );
|
|
}
|
|
|
|
/** Get the properties associated this multitrack.
|
|
*/
|
|
|
|
mlt_properties mlt_multitrack_properties( mlt_multitrack this )
|
|
{
|
|
return MLT_MULTITRACK_PROPERTIES( this );
|
|
}
|
|
|
|
/** Initialise position related information.
|
|
*/
|
|
|
|
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.
|
|
*/
|
|
|
|
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.
|
|
*/
|
|
|
|
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.
|
|
*/
|
|
|
|
int mlt_multitrack_count( mlt_multitrack this )
|
|
{
|
|
return this->count;
|
|
}
|
|
|
|
/** Get an individual track as a producer.
|
|
*/
|
|
|
|
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;
|
|
}
|
|
|
|
static int position_compare( const void *p1, const void *p2 )
|
|
{
|
|
return *( mlt_position * )p1 - *( mlt_position * )p2;
|
|
}
|
|
|
|
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.
|
|
|
|
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]
|
|
*/
|
|
|
|
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.
|
|
|
|
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.
|
|
*/
|
|
|
|
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( );
|
|
|
|
// 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.
|
|
*/
|
|
|
|
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 );
|
|
}
|
|
}
|