/* GStreamer

 * Copyright (C) 2004 Wim Taymans <wim@fluendo.com>

 *

 * gstmessage.h: Header for GstMessage 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_MESSAGE_H__

#define __GST_MESSAGE_H__

G_BEGIN_DECLS

typedef struct _GstMessage GstMessage;

typedef struct _GstMessageClass GstMessageClass;

/**

 * GstMessageType:

 * @GST_MESSAGE_UNKNOWN: an undefined message

 * @GST_MESSAGE_EOS: end-of-stream reached in a pipeline. The application will

 * only receive this message in the PLAYING state and every time it sets a

 * pipeline to PLAYING that is in the EOS state. The application can perform a

 * flushing seek in the pipeline, which will undo the EOS state again. 

 * @GST_MESSAGE_ERROR: an error occured. Whe the application receives an error

 * message it should stop playback of the pipeline and not assume that more

 * data will be played.

 * @GST_MESSAGE_WARNING: a warning occured.

 * @GST_MESSAGE_INFO: an info message occured

 * @GST_MESSAGE_TAG: a tag was found.

 * @GST_MESSAGE_BUFFERING: the pipeline is buffering. When the application

 * receives a buffering message in the PLAYING state for a non-live pipeline it

 * must PAUSE the pipeline until the buffering completes, when the percentage

 * field in the message is 100%. For live pipelines, no action must be

 * performed and the buffering percentage can be used to inform the user about

 * the progress.

 * @GST_MESSAGE_STATE_CHANGED: a state change happened

 * @GST_MESSAGE_STATE_DIRTY: an element changed state in a streaming thread.

 * This message is deprecated.

 * @GST_MESSAGE_STEP_DONE: a framestep finished. This message is not yet

 * implemented.

 * @GST_MESSAGE_CLOCK_PROVIDE: an element notifies its capability of providing

 *                             a clock. This message is used internally and

 *                             never forwarded to the application.

 * @GST_MESSAGE_CLOCK_LOST: The current clock as selected by the pipeline became

 *                          unusable. The pipeline will select a new clock on

 *                          the next PLAYING state change.

 * @GST_MESSAGE_NEW_CLOCK: a new clock was selected in the pipeline.

 * @GST_MESSAGE_STREAM_STATUS: status about a stream, emitted when it starts,

 *                             stops, errors, etc.. Not implemented yet.

 * @GST_MESSAGE_APPLICATION: message posted by the application, possibly

 *                           via an application-specific element.

 * @GST_MESSAGE_ELEMENT: element-specific message, see the specific element's

 *                       documentation

 * @GST_MESSAGE_SEGMENT_START: pipeline started playback of a segment. This

 * message is used internally and never forwarded to the application.

 * @GST_MESSAGE_SEGMENT_DONE: pipeline completed playback of a segment. This

 * message is forwarded to the application after all elements that posted

 * @GST_MESSAGE_SEGMENT_START posted a GST_MESSAGE_SEGMENT_DONE message.

 * @GST_MESSAGE_DURATION: The duration of a pipeline changed. The application

 * can get the new duration with a duration query.

 * @GST_MESSAGE_ASYNC_START: Posted by elements when they start an ASYNC state

 * change. This message is not forwarded to the application but is used

 * internally. Since: 0.10.13. 

 * @GST_MESSAGE_ASYNC_DONE: Posted by elements when they complete an ASYNC state

 * change. The application will only receive this message from the toplevel

 * pipeline. Since: 0.10.13

 * @GST_MESSAGE_LATENCY: Posted by elements when their latency changes. The

 * pipeline will calculate and distribute a new latency. Since: 0.10.12

 * @GST_MESSAGE_ANY: mask for all of the above messages.

 *

 * The different message types that are available.

 */

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

 * NOTE: keep GST_MESSAGE_ANY a valid gint to avoid compiler warnings.

 */ 

typedef enum

{

  GST_MESSAGE_UNKNOWN           = 0,

  GST_MESSAGE_EOS               = (1 << 0),

  GST_MESSAGE_ERROR             = (1 << 1),

  GST_MESSAGE_WARNING           = (1 << 2),

  GST_MESSAGE_INFO              = (1 << 3),

  GST_MESSAGE_TAG               = (1 << 4),

  GST_MESSAGE_BUFFERING         = (1 << 5),

  GST_MESSAGE_STATE_CHANGED     = (1 << 6),

  GST_MESSAGE_STATE_DIRTY       = (1 << 7),

  GST_MESSAGE_STEP_DONE         = (1 << 8),

  GST_MESSAGE_CLOCK_PROVIDE     = (1 << 9),

  GST_MESSAGE_CLOCK_LOST        = (1 << 10),

  GST_MESSAGE_NEW_CLOCK         = (1 << 11),

  GST_MESSAGE_STRUCTURE_CHANGE  = (1 << 12),

  GST_MESSAGE_STREAM_STATUS     = (1 << 13),

  GST_MESSAGE_APPLICATION       = (1 << 14),

  GST_MESSAGE_ELEMENT           = (1 << 15),

  GST_MESSAGE_SEGMENT_START     = (1 << 16),

  GST_MESSAGE_SEGMENT_DONE      = (1 << 17),

  GST_MESSAGE_DURATION          = (1 << 18),

  GST_MESSAGE_LATENCY           = (1 << 19),

  GST_MESSAGE_ASYNC_START       = (1 << 20),

  GST_MESSAGE_ASYNC_DONE        = (1 << 21),

  GST_MESSAGE_ANY               = ~0

} GstMessageType;

#include <gst/gstminiobject.h>

#include <gst/gstobject.h>

#include <gst/gstelement.h>

#include <gst/gsttaglist.h>

#include <gst/gststructure.h>

/**

 * GST_MESSAGE_TRACE_NAME:

 *

 * The name used for memory allocation tracing

 */

#define GST_MESSAGE_TRACE_NAME	"GstMessage"

#define GST_TYPE_MESSAGE			 (gst_message_get_type())

#define GST_IS_MESSAGE(obj)                      (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_MESSAGE))

#define GST_IS_MESSAGE_CLASS(klass)              (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_MESSAGE))

#define GST_MESSAGE_GET_CLASS(obj)               (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_MESSAGE, GstMessageClass))

#define GST_MESSAGE(obj)                         (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_MESSAGE, GstMessage))

#define GST_MESSAGE_CLASS(klass)                 (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_MESSAGE, GstMessageClass))

#define GST_MESSAGE_CAST(obj)                    ((GstMessage*)(obj))

/* the lock is used to handle the synchronous handling of messages,

 * the emiting thread is block until the handling thread processed

 * the message using this mutex/cond pair */

#define GST_MESSAGE_GET_LOCK(message)	(GST_MESSAGE(message)->lock)

#define GST_MESSAGE_LOCK(message)	g_mutex_lock(GST_MESSAGE_GET_LOCK(message))

#define GST_MESSAGE_UNLOCK(message)	g_mutex_unlock(GST_MESSAGE_GET_LOCK(message))

#define GST_MESSAGE_COND(message)	(GST_MESSAGE(message)->cond)

#define GST_MESSAGE_WAIT(message)	g_cond_wait(GST_MESSAGE_COND(message),GST_MESSAGE_GET_LOCK(message))

#define GST_MESSAGE_SIGNAL(message)	g_cond_signal(GST_MESSAGE_COND(message))

/**

 * GST_MESSAGE_TYPE:

 * @message: a #GstMessage

 *

 * Get the #GstMessageType of @message.

 */

#define GST_MESSAGE_TYPE(message)	(GST_MESSAGE(message)->type)

/**

 * GST_MESSAGE_TYPE_NAME:

 * @message: a #GstMessage

 *

 * Get a constant string representation of the #GstMessageType of @message.

 *

 * Since: 0.10.4

 */

#define GST_MESSAGE_TYPE_NAME(message)	gst_message_type_get_name(GST_MESSAGE_TYPE(message))

/**

 * GST_MESSAGE_TIMESTAMP:

 * @message: a #GstMessage

 *

 * Get the timestamp of @message. This is the timestamp when the message

 * was created.

 */

#define GST_MESSAGE_TIMESTAMP(message)	(GST_MESSAGE(message)->timestamp)

/**

 * GST_MESSAGE_SRC:

 * @message: a #GstMessage

 *

 * Get the object that posted @message.

 */

#define GST_MESSAGE_SRC(message)	(GST_MESSAGE(message)->src)

/**

 * GstMessage:

 * @mini_object: the parent structure

 * @type: the #GstMessageType of the message

 * @timestamp: the timestamp of the message

 * @src: the src of the message

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

 *

 * A #GstMessage.

 */

struct _GstMessage

{

  GstMiniObject mini_object;

  GMutex *lock;                 /* lock and cond for async delivery */

  GCond *cond;

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

  GstMessageType type;

  guint64 timestamp;

  GstObject *src;

  GstStructure *structure;

};

struct _GstMessageClass {

  GstMiniObjectClass mini_object_class;

  gpointer _gst_reserved[GST_PADDING];

};

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GType		gst_message_get_type		(void);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

const gchar*	gst_message_type_get_name	(GstMessageType type);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GQuark		gst_message_type_to_quark	(GstMessageType type);

/* refcounting */

/**

 * gst_message_ref:

 * @msg: the message to ref

 *

 * Convenience macro to increase the reference count of the message.

 *

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

 */

#ifdef _FOOL_GTK_DOC_

G_INLINE_FUNC GstMessage * gst_message_ref (GstMessage * msg);

#endif

static inline GstMessage *

gst_message_ref (GstMessage * msg)

{

  return (GstMessage *) gst_mini_object_ref (GST_MINI_OBJECT (msg));

}

/**

 * gst_message_unref:

 * @msg: the message to unref

 *

 * Convenience macro to decrease the reference count of the message, possibly

 * freeing it.

 */

/* copy message */

/**

 * gst_message_copy:

 * @msg: the message to copy

 *

 * Creates a copy of the message. Returns a copy of the message.

 *

 * MT safe

 */

/**

 * gst_message_make_writable:

 * @msg: the message to make writable

 *

 * Checks if a message is writable. If not, a writable copy is made and

 * returned. Returns a message (possibly a duplicate) that is writable.

 *

 * MT safe

 */

#define         gst_message_make_writable(msg)	GST_MESSAGE (gst_mini_object_make_writable (GST_MINI_OBJECT (msg)))

GstMessage *	gst_message_new_eos		(GstObject * src);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

#ifdef __SYMBIAN32__

IMPORT_C

#endif

#ifdef __SYMBIAN32__

IMPORT_C

#endif

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstMessage *	gst_message_new_tag		(GstObject * src, GstTagList * tag_list);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstMessage *	gst_message_new_state_changed	(GstObject * src, GstState oldstate,

                                                 GstState newstate, GstState pending);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstMessage *	gst_message_new_state_dirty	(GstObject * src);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

GstMessage *	gst_message_new_clock_provide	(GstObject * src, GstClock *clock, gboolean ready);

#ifdef __SYMBIAN32__