-/*
- * mlt_service.h -- interface for all service classes
- * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
- * Author: Charles Yates <charles.yates@pandora.be>
+/**
+ * \file mlt_service.h
+ * \brief interface declaration for all service classes
+ * \see mlt_service_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
#define _MLT_SERVICE_H_
#include "mlt_properties.h"
+#include "mlt_types.h"
-/** The interface definition for all services.
-*/
+/** \brief Service abstract base class
+ *
+ * \extends mlt_properties
+ * The service is the base class for all of the interesting classes and
+ * plugins for MLT. A service can have multiple inputs connections to
+ * other services called its "producers" but only a single output to another
+ * service called its "consumer." A service that has both producer and
+ * consumer connections is called a filter. Any service can have zero or more
+ * filters "attached" to it. We call any collection of services and their
+ * connections a "service network," which is similar to what DirectShow calls
+ * a filter graph or what gstreamer calls an element pipeline.
+ *
+ * \event \em service-changed a filter was attached or detached or a transition was connected or disconnected
+ * \event \em property-changed
+ * \properties \em mlt_type identifies the subclass
+ * \properties \em _mlt_service_hidden a flag that indicates whether to hide the mlt_service
+ * \properties \em mlt_service is the name of the implementation of the service
+ * \properties \em resource is either the stream identifier or grandchild-class
+ * \properties \em in when to start, what is started is service-specific
+ * \properties \em out when to stop
+ * \properties \em _filter_private Set this on a service to ensure that attached filters are handled privately.
+ * See modules/core/filter_region.c and modules/core/filter_watermark.c for examples.
+ * \properties \em _profile stores the mlt_profile for a service
+ * \properties \em _unique_id is a unique identifier
+ * \properties \em _need_previous_next boolean that instructs producers to get
+ * preceding and following frames inside of \p mlt_service_get_frame
+ */
struct mlt_service_s
{
- /* We're extending properties here */
- struct mlt_properties_s parent;
+ struct mlt_properties_s parent; /**< \private A service extends properties. */
- /* Protected virtual */
+ /** Get a frame of data (virtual function).
+ *
+ * \param mlt_producer a producer
+ * \param mlt_frame_ptr a frame pointer by reference
+ * \param int an index
+ * \return true if there was an error
+ */
int ( *get_frame )( mlt_service self, mlt_frame_ptr frame, int index );
+
+ /** the destructor virtual function */
mlt_destructor close;
- void *close_object;
+ void *close_object; /**< the object supplied to the close virtual function */
- /* Private data */
- void *local;
- void *child;
+ void *local; /**< \private instance object */
+ void *child; /**< \private the object of a subclass */
};
-/** The public API.
-*/
-
#define MLT_SERVICE_PROPERTIES( service ) ( &( service )->parent )
extern int mlt_service_init( mlt_service self, void *child );
extern void mlt_service_unlock( mlt_service self );
extern mlt_service_type mlt_service_identify( mlt_service self );
extern int mlt_service_connect_producer( mlt_service self, mlt_service producer, int index );
+extern mlt_service mlt_service_get_producer( mlt_service self );
extern int mlt_service_get_frame( mlt_service self, mlt_frame_ptr frame, int index );
extern mlt_properties mlt_service_properties( mlt_service self );
extern mlt_service mlt_service_consumer( mlt_service self );
extern int mlt_service_attach( mlt_service self, mlt_filter filter );
extern int mlt_service_detach( mlt_service self, mlt_filter filter );
extern void mlt_service_apply_filters( mlt_service self, mlt_frame frame, int index );
+extern int mlt_service_filter_count( mlt_service self );
+extern int mlt_service_move_filter( mlt_service self, int from, int to );
extern mlt_filter mlt_service_filter( mlt_service self, int index );
-
+extern mlt_profile mlt_service_profile( mlt_service self );
+extern void mlt_service_set_profile( mlt_service self, mlt_profile profile );
extern void mlt_service_close( mlt_service self );
-/* I'm not sure about self one - leaving it out of docs for now (only used in consumer_westley) */
-extern mlt_service mlt_service_get_producer( mlt_service self );
+extern void mlt_service_cache_put( mlt_service self, const char *name, void* data, int size, mlt_destructor destructor );
+extern mlt_cache_item mlt_service_cache_get( mlt_service self, const char *name );
+extern void mlt_service_cache_set_size( mlt_service self, const char *name, int size );
+extern int mlt_service_cache_get_size( mlt_service self, const char *name );
+extern void mlt_service_cache_purge( mlt_service self );
#endif
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