/* GStreamer

 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>

 *                    2000 Wim Taymans <wim.taymans@chello.be>

 *                    2005 Wim Taymans <wim@fluendo.com>

 *

 * gstevent.h: Header for GstEvent subsystem

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Library General Public

 * License as published by the Free Software Foundation; either

 * version 2 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

 * Library General Public License for more details.

 *

 * You should have received a copy of the GNU Library 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.

 */

#ifndef __GST_EVENT_H__

#define __GST_EVENT_H__

#include <gst/gstminiobject.h>

#include <gst/gstformat.h>

#include <gst/gstobject.h>

#include <gst/gstclock.h>

#include <gst/gststructure.h>

#include <gst/gsttaglist.h>

G_BEGIN_DECLS

/**

 * GstEventTypeFlags:

 * @GST_EVENT_TYPE_UPSTREAM:   Set if the event can travel upstream.

 * @GST_EVENT_TYPE_DOWNSTREAM: Set if the event can travel downstream.

 * @GST_EVENT_TYPE_SERIALIZED: Set if the event should be serialized with data

 *                             flow.

 *

 * #GstEventTypeFlags indicate the aspects of the different #GstEventType

 * values. You can get the type flags of a #GstEventType with the

 * gst_event_type_get_flags() function.

 */

typedef enum {

  GST_EVENT_TYPE_UPSTREAM	= 1 << 0,

  GST_EVENT_TYPE_DOWNSTREAM	= 1 << 1,

  GST_EVENT_TYPE_SERIALIZED	= 1 << 2

} GstEventTypeFlags;

/**

 * GST_EVENT_TYPE_BOTH:

 *

 * The same thing as #GST_EVENT_TYPE_UPSTREAM | #GST_EVENT_TYPE_DOWNSTREAM.

 */

#define GST_EVENT_TYPE_BOTH \

    (GST_EVENT_TYPE_UPSTREAM | GST_EVENT_TYPE_DOWNSTREAM)

#define GST_EVENT_TYPE_SHIFT	4

/**

 * GST_EVENT_MAKE_TYPE:

 * @num: the event number to create

 * @flags: the event flags

 *

 * when making custom event types, use this macro with the num and

 * the given flags

 */

#define GST_EVENT_MAKE_TYPE(num,flags) \

    (((num) << GST_EVENT_TYPE_SHIFT) | (flags))

#define FLAG(name) GST_EVENT_TYPE_##name

/**

 * GstEventType:

 * @GST_EVENT_UNKNOWN: unknown event.

 * @GST_EVENT_FLUSH_START: Start a flush operation

 * @GST_EVENT_FLUSH_STOP: Stop a flush operation

 * @GST_EVENT_EOS: End-Of-Stream. No more data is to be expected to follow

 *                 without a NEWSEGMENT event.

 * @GST_EVENT_NEWSEGMENT: A new media segment follows in the dataflow.

 * @GST_EVENT_TAG: A new set of metadata tags has been found in the stream.

 * @GST_EVENT_BUFFERSIZE: Notification of buffering requirements

 * @GST_EVENT_QOS: A quality message. Used to indicate to upstream elements

 *                 that the downstream elements are being starved of or

 *                 flooded with data.

 * @GST_EVENT_SEEK: A request for a new playback position and rate.

 * @GST_EVENT_NAVIGATION: Navigation events are usually used for communicating

 *                        user requests, such as mouse or keyboard movements,

 *                        to upstream elements.

 * @GST_EVENT_LATENCY: Notification of new latency adjustment. Since: 0.10.12

 * @GST_EVENT_STEP: A request for stepping through the media. Since: 0.10.24

 * @GST_EVENT_CUSTOM_UPSTREAM: Upstream custom event

 * @GST_EVENT_CUSTOM_DOWNSTREAM: Downstream custom event that travels in the

 *                        data flow.

 * @GST_EVENT_CUSTOM_DOWNSTREAM_OOB: Custom out-of-band downstream event.

 * @GST_EVENT_CUSTOM_BOTH: Custom upstream or downstream event.

 *                         In-band when travelling downstream.

 * @GST_EVENT_CUSTOM_BOTH_OOB: Custom upstream or downstream out-of-band event.

 *

 * #GstEventType lists the standard event types that can be sent in a pipeline.

 *

 * The custom event types can be used for private messages between elements

 * that can't be expressed using normal

 * GStreamer buffer passing semantics. Custom events carry an arbitrary

 * #GstStructure.

 * Specific custom events are distinguished by the name of the structure.

 */

/* NOTE: keep in sync with quark registration in gstevent.c */

typedef enum {

  GST_EVENT_UNKNOWN		  = GST_EVENT_MAKE_TYPE (0, 0),

  /* bidirectional events */

  GST_EVENT_FLUSH_START		  = GST_EVENT_MAKE_TYPE (1, FLAG(BOTH)),

  GST_EVENT_FLUSH_STOP		  = GST_EVENT_MAKE_TYPE (2, FLAG(BOTH) | FLAG(SERIALIZED)),

  /* downstream serialized events */

  GST_EVENT_EOS			  = GST_EVENT_MAKE_TYPE (5, FLAG(DOWNSTREAM) | FLAG(SERIALIZED)),

  GST_EVENT_NEWSEGMENT		  = GST_EVENT_MAKE_TYPE (6, FLAG(DOWNSTREAM) | FLAG(SERIALIZED)),

  GST_EVENT_TAG			  = GST_EVENT_MAKE_TYPE (7, FLAG(DOWNSTREAM) | FLAG(SERIALIZED)),

  GST_EVENT_BUFFERSIZE		  = GST_EVENT_MAKE_TYPE (8, FLAG(DOWNSTREAM) | FLAG(SERIALIZED)),

  /* upstream events */

  GST_EVENT_QOS			  = GST_EVENT_MAKE_TYPE (15, FLAG(UPSTREAM)),

  GST_EVENT_SEEK		  = GST_EVENT_MAKE_TYPE (16, FLAG(UPSTREAM)),

  GST_EVENT_NAVIGATION		  = GST_EVENT_MAKE_TYPE (17, FLAG(UPSTREAM)),

  GST_EVENT_LATENCY		  = GST_EVENT_MAKE_TYPE (18, FLAG(UPSTREAM)),

  GST_EVENT_STEP		  = GST_EVENT_MAKE_TYPE (19, FLAG(UPSTREAM)),

  /* custom events start here */

  GST_EVENT_CUSTOM_UPSTREAM	  = GST_EVENT_MAKE_TYPE (32, FLAG(UPSTREAM)),

  GST_EVENT_CUSTOM_DOWNSTREAM	  = GST_EVENT_MAKE_TYPE (32, FLAG(DOWNSTREAM) | FLAG(SERIALIZED)),

  GST_EVENT_CUSTOM_DOWNSTREAM_OOB = GST_EVENT_MAKE_TYPE (32, FLAG(DOWNSTREAM)),

  GST_EVENT_CUSTOM_BOTH		  = GST_EVENT_MAKE_TYPE (32, FLAG(BOTH) | FLAG(SERIALIZED)),

  GST_EVENT_CUSTOM_BOTH_OOB	  = GST_EVENT_MAKE_TYPE (32, FLAG(BOTH))

} GstEventType;

#undef FLAG

/**

 * GST_EVENT_TRACE_NAME:

 *

 * The name used for memory allocation tracing

 */

#define GST_EVENT_TRACE_NAME	"GstEvent"

typedef struct _GstEvent GstEvent;

typedef struct _GstEventClass GstEventClass;

#define GST_TYPE_EVENT		        (gst_event_get_type())

#define GST_IS_EVENT(obj)               (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_EVENT))

#define GST_IS_EVENT_CLASS(klass)       (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_EVENT))

#define GST_EVENT_GET_CLASS(obj)        (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_EVENT, GstEventClass))

#define GST_EVENT(obj)                  (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_EVENT, GstEvent))

#define GST_EVENT_CLASS(klass)          (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_EVENT, GstEventClass))

#define GST_EVENT_CAST(obj)             ((GstEvent *)(obj))

/**

 * GST_EVENT_TYPE:

 * @event: the event to query

 *

 * Get the #GstEventType of the event.

 */

#define GST_EVENT_TYPE(event)		(GST_EVENT_CAST(event)->type)

/**

 * GST_EVENT_TYPE_NAME:

 * @event: the event to query

 *

 * Get a constant string representation of the #GstEventType of the event.

 */

#define GST_EVENT_TYPE_NAME(event)	(gst_event_type_get_name(GST_EVENT_TYPE(event)))

/**

 * GST_EVENT_TIMESTAMP:

 * @event: the event to query

 *

 * Get the #GstClockTime timestamp of the event. This is the time when the event

 * was created.

 */

#define GST_EVENT_TIMESTAMP(event)	(GST_EVENT_CAST(event)->timestamp)

/**

 * GST_EVENT_SRC:

 * @event: the event to query

 *

 * The source #GstObject that generated this event.

 */

#define GST_EVENT_SRC(event)		(GST_EVENT_CAST(event)->src)

/**

 * GST_EVENT_IS_UPSTREAM:

 * @ev: the event to query

 *

 * Check if an event can travel upstream.

 */

#define GST_EVENT_IS_UPSTREAM(ev)	!!(GST_EVENT_TYPE (ev) & GST_EVENT_TYPE_UPSTREAM)

/**

 * GST_EVENT_IS_DOWNSTREAM:

 * @ev: the event to query

 *

 * Check if an event can travel downstream.

 */

#define GST_EVENT_IS_DOWNSTREAM(ev)	!!(GST_EVENT_TYPE (ev) & GST_EVENT_TYPE_DOWNSTREAM)

/**

 * GST_EVENT_IS_SERIALIZED:

 * @ev: the event to query

 *

 * Check if an event is serialized with the data stream.

 */

#define GST_EVENT_IS_SERIALIZED(ev)	!!(GST_EVENT_TYPE (ev) & GST_EVENT_TYPE_SERIALIZED)

/**

 * gst_event_replace:

 * @old_event: pointer to a pointer to a #GstEvent to be replaced.

 * @new_event: pointer to a #GstEvent that will replace the event pointed to

 *        by @old_event.

 *

 * Modifies a pointer to a #GstEvent to point to a different #GstEvent. The

 * modification is done atomically (so this is useful for ensuring thread safety

 * in some cases), and the reference counts are updated appropriately (the old

 * event is unreffed, the new one is reffed).

 *

 * Either @new_event or the #GstEvent pointed to by @old_event may be NULL.

 *

 * Since: 0.10.3

 */

#define		gst_event_replace(old_event,new_event) \

    gst_mini_object_replace ((GstMiniObject **)(old_event), GST_MINI_OBJECT (new_event))

/**

 * GstSeekType:

 * @GST_SEEK_TYPE_NONE: no change in position is required

 * @GST_SEEK_TYPE_CUR: change relative to currently configured segment. This

 *    can't be used to seek relative to the current playback position - do a

 *    position query, calculate the desired position and then do an absolute

 *    position seek instead if that's what you want to do.

 * @GST_SEEK_TYPE_SET: absolute position is requested

 * @GST_SEEK_TYPE_END: relative position to duration is requested

 *

 * The different types of seek events. When constructing a seek event with

 * gst_event_new_seek(), a format, a seek method and optional flags are to

 * be provided. The seek event is then inserted into the graph with

 * gst_pad_send_event() or gst_element_send_event().

 */

typedef enum {

  /* one of these */

  GST_SEEK_TYPE_NONE		= 0,

  GST_SEEK_TYPE_CUR		= 1,

  GST_SEEK_TYPE_SET		= 2,

  GST_SEEK_TYPE_END		= 3

} GstSeekType;

/**

 * GstSeekFlags:

 * @GST_SEEK_FLAG_NONE: no flag

 * @GST_SEEK_FLAG_FLUSH: flush pipeline

 * @GST_SEEK_FLAG_ACCURATE: accurate position is requested, this might

 *                     be considerably slower for some formats.

 * @GST_SEEK_FLAG_KEY_UNIT: seek to the nearest keyframe. This might be

 *		       faster but less accurate.

 * @GST_SEEK_FLAG_SEGMENT: perform a segment seek.

 * @GST_SEEK_FLAG_SKIP: when doing fast foward or fast reverse playback, allow

 *                     elements to skip frames instead of generating all

 *                     frames. Since 0.10.22.

 *

 * Flags to be used with gst_element_seek() or gst_event_new_seek(). All flags

 * can be used together.

 *

 * A non flushing seek might take some time to perform as the currently

 * playing data in the pipeline will not be cleared.

 *

 * An accurate seek might be slower for formats that don't have any indexes

 * or timestamp markers in the stream. Specifying this flag might require a

 * complete scan of the file in those cases.

 *

 * When performing a segment seek: after the playback of the segment completes,

 * no EOS will be emmited by the element that performed the seek, but a

 * #GST_MESSAGE_SEGMENT_DONE message will be posted on the bus by the element.

 * When this message is posted, it is possible to send a new seek event to

 * continue playback. With this seek method it is possible to perform seemless

 * looping or simple linear editing.

 *

 * When doing fast forward (rate > 1.0) or fast reverse (rate < -1.0) trickmode

 * playback, the @GST_SEEK_FLAG_SKIP flag can be used to instruct decoders

 * and demuxers to adjust the playback rate by skipping frames. This can improve

 * performance and decrease CPU usage because not all frames need to be decoded. 

 */

typedef enum {

  GST_SEEK_FLAG_NONE		= 0,

  GST_SEEK_FLAG_FLUSH		= (1 << 0),

  GST_SEEK_FLAG_ACCURATE	= (1 << 1),

  GST_SEEK_FLAG_KEY_UNIT	= (1 << 2),

  GST_SEEK_FLAG_SEGMENT		= (1 << 3),

  GST_SEEK_FLAG_SKIP		= (1 << 4)

} GstSeekFlags;

/**

 * GstEvent:

 * @mini_object: the parent structure

 * @type: the #GstEventType of the event

 * @timestamp: the timestamp of the event

 * @src: the src of the event

 * @structure: the #GstStructure containing the event info.

 *

 * A #GstEvent.

 */

struct _GstEvent {

  GstMiniObject mini_object;

  /*< public >*/ /* with COW */

  GstEventType  type;

  guint64	timestamp;

  GstObject	*src;

  GstStructure	*structure;

  /*< private >*/

  union {

    guint32 seqnum;

    gpointer _gst_reserved;

  } abidata;

};

struct _GstEventClass {

  GstMiniObjectClass mini_object_class;

  /*< private >*/

  gpointer _gst_reserved[GST_PADDING];

};

#ifdef __SYMBIAN32__

IMPORT_C

#endif

const gchar*    gst_event_type_get_name         (GstEventType type);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GQuark          gst_event_type_to_quark		(GstEventType type);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstEventTypeFlags

		gst_event_type_get_flags	(GstEventType type);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GType		gst_event_get_type		(void);

/* refcounting */

/**

 * gst_event_ref:

 * @event: The event to refcount

 *

 * Increase the refcount of this event.

 *

 * Returns: @event (for convenience when doing assignments)

 */

#ifdef _FOOL_GTK_DOC_

G_INLINE_FUNC GstEvent * gst_event_ref (GstEvent * event);

#endif

static inline GstEvent *

gst_event_ref (GstEvent * event)

{

  return (GstEvent *) gst_mini_object_ref (GST_MINI_OBJECT (event));

}

/**

 * gst_event_unref:

 * @event: The event to refcount

 *

 * Decrease the refcount of an event, freeing it if the refcount reaches 0.

 */

#ifdef _FOOL_GTK_DOC_

G_INLINE_FUNC void gst_event_unref (GstEvent * event);

#endif

static inline void

gst_event_unref (GstEvent * event)

{

  gst_mini_object_unref (GST_MINI_OBJECT (event));

}

/* copy event */

/**

 * gst_event_copy:

 * @event: The event to copy

 *

 * Copy the event using the event specific copy function.

 */

#ifdef _FOOL_GTK_DOC_

G_INLINE_FUNC void gst_event_copy (GstEvent * event);

#endif

static inline GstEvent *

gst_event_copy (const GstEvent * event)

{

  return GST_EVENT_CAST (gst_mini_object_copy (GST_MINI_OBJECT (event)));

}

/* custom event */

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstEvent*	gst_event_new_custom		(GstEventType type, GstStructure *structure);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

const GstStructure *

		gst_event_get_structure		(GstEvent *event);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

gboolean        gst_event_has_name              (GstEvent *event, const gchar *name);

/* identifiers for events and messages */

#ifdef __SYMBIAN32__

IMPORT_C

#endif

guint32         gst_event_get_seqnum            (GstEvent *event);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

void            gst_event_set_seqnum            (GstEvent *event, guint32 seqnum);

/* flush events */

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstEvent *	gst_event_new_flush_start	(void);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstEvent *	gst_event_new_flush_stop	(void);

/* EOS event */

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstEvent *	gst_event_new_eos		(void);

/* newsegment events */

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstEvent*	gst_event_new_new_segment	(gboolean update, gdouble rate,

                                                 GstFormat format,

                                                 gint64 start, gint64 stop,

						 gint64 position);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstEvent*	gst_event_new_new_segment_full	(gboolean update, gdouble rate,

						 gdouble applied_rate,

                                                 GstFormat format,

                                                 gint64 start, gint64 stop,

						 gint64 position);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

void		gst_event_parse_new_segment	(GstEvent *event,

                                                 gboolean *update,

                                                 gdouble *rate,

						 GstFormat *format,

                                                 gint64 *start, gint64 *stop,

						 gint64 *position);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

void		gst_event_parse_new_segment_full (GstEvent *event,

                                                 gboolean *update,

                                                 gdouble *rate,

                                                 gdouble *applied_rate,

						 GstFormat *format,

                                                 gint64 *start, gint64 *stop,

						 gint64 *position);

/* tag event */

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstEvent*	gst_event_new_tag		(GstTagList *taglist);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

void		gst_event_parse_tag		(GstEvent *event, GstTagList **taglist);

/* buffer */

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstEvent *	gst_event_new_buffer_size	(GstFormat format, gint64 minsize, gint64 maxsize,

						 gboolean async);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

void		gst_event_parse_buffer_size	(GstEvent *event, GstFormat *format, gint64 *minsize,