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/* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef __GST_MESSAGE_H__
#define __GST_MESSAGE_H__
G_BEGIN_DECLS
typedef struct _GstMessage GstMessage;
/**
* 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. When 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 stepping operation finished.
* @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. The application
* should set the pipeline to PAUSED and back to
* PLAYING when this message is received.
* @GST_MESSAGE_NEW_CLOCK: a new clock was selected in the pipeline.
* @GST_MESSAGE_STRUCTURE_CHANGE: the structure of the pipeline changed. This
* message is used internally and never forwarded to the application.
* @GST_MESSAGE_STREAM_STATUS: status about a stream, emitted when it starts,
* stops, errors, etc..
* @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_CHANGED: 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
* #GstStateChange. This message is not forwarded to the application but is used
* internally.
* @GST_MESSAGE_ASYNC_DONE: Posted by elements when they complete an ASYNC
* #GstStateChange. The application will only receive this message from the toplevel
* pipeline.
* @GST_MESSAGE_LATENCY: Posted by elements when their latency changes. The
* application should recalculate and distribute a new latency.
* @GST_MESSAGE_REQUEST_STATE: Posted by elements when they want the pipeline to
* change state. This message is a suggestion to the application which can
* decide to perform the state change on (part of) the pipeline.
* @GST_MESSAGE_STEP_START: A stepping operation was started.
* @GST_MESSAGE_QOS: A buffer was dropped or an element changed its processing
* strategy for Quality of Service reasons.
* @GST_MESSAGE_PROGRESS: A progress message.
* @GST_MESSAGE_TOC: A new table of contents (TOC) was found or previously found TOC
* was updated.
* @GST_MESSAGE_RESET_TIME: Message to request resetting the pipeline's
* running time from the pipeline. This is an internal message which
* applications will likely never receive.
* @GST_MESSAGE_STREAM_START: Message indicating start of a new stream. Useful
* e.g. when using playbin in gapless playback mode, to get notified when
* the next title actually starts playing (which will be some time after
* the URI for the next title has been set).
* @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_CHANGED = (1 << 18),
GST_MESSAGE_LATENCY = (1 << 19),
GST_MESSAGE_ASYNC_START = (1 << 20),
GST_MESSAGE_ASYNC_DONE = (1 << 21),
GST_MESSAGE_REQUEST_STATE = (1 << 22),
GST_MESSAGE_STEP_START = (1 << 23),
GST_MESSAGE_QOS = (1 << 24),
GST_MESSAGE_PROGRESS = (1 << 25),
GST_MESSAGE_TOC = (1 << 26),
GST_MESSAGE_RESET_TIME = (1 << 27),
GST_MESSAGE_STREAM_START = (1 << 28),
GST_MESSAGE_NEED_CONTEXT = (1 << 29),
GST_MESSAGE_HAVE_CONTEXT = (1 << 30),
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>
#include <gst/gstquery.h>
#include <gst/gsttoc.h>
#define GST_TYPE_MESSAGE (gst_message_get_type())
#define GST_IS_MESSAGE(obj) (GST_IS_MINI_OBJECT_TYPE (obj, GST_TYPE_MESSAGE))
#define GST_MESSAGE_CAST(obj) ((GstMessage*)(obj))
#define GST_MESSAGE(obj) (GST_MESSAGE_CAST(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_CAST(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_GET_COND(message) (&GST_MESSAGE_CAST(message)->cond)
#define GST_MESSAGE_WAIT(message) g_cond_wait(GST_MESSAGE_GET_COND(message),GST_MESSAGE_GET_LOCK(message))
#define GST_MESSAGE_SIGNAL(message) g_cond_signal(GST_MESSAGE_GET_COND(message))
/**
* GST_MESSAGE_TYPE:
* @message: a #GstMessage
*
* Get the #GstMessageType of @message.
*/
#define GST_MESSAGE_TYPE(message) (GST_MESSAGE_CAST(message)->type)
/**
* GST_MESSAGE_TYPE_NAME:
* @message: a #GstMessage
*
* Get a constant string representation of the #GstMessageType of @message.
*/
#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_CAST(message)->timestamp)
/**
* GST_MESSAGE_SRC:
* @message: a #GstMessage
*
* Get the object that posted @message.
*/
#define GST_MESSAGE_SRC(message) (GST_MESSAGE_CAST(message)->src)
/**
* GST_MESSAGE_SEQNUM:
* @message: a #GstMessage
*
* Get the sequence number of @message.
*/
#define GST_MESSAGE_SEQNUM(message) (GST_MESSAGE_CAST(message)->seqnum)
/**
* GST_MESSAGE_SRC_NAME:
* @message: a #GstMessage
*
* Get the name of the object that posted @message. Returns "(NULL)" if
* the message has no source object set.
*/
#define GST_MESSAGE_SRC_NAME(message) (GST_MESSAGE_SRC(message) ? \
GST_OBJECT_NAME (GST_MESSAGE_SRC(message)) : "(NULL)")
/**
* GstStructureChangeType:
* @GST_STRUCTURE_CHANGE_TYPE_PAD_LINK: Pad linking is starting or done.
* @GST_STRUCTURE_CHANGE_TYPE_PAD_UNLINK: Pad unlinking is starting or done.
*
* The type of a %GST_MESSAGE_STRUCTURE_CHANGE.
*/
typedef enum {
GST_STRUCTURE_CHANGE_TYPE_PAD_LINK = 0,
GST_STRUCTURE_CHANGE_TYPE_PAD_UNLINK = 1
} GstStructureChangeType;
/**
* GstStreamStatusType:
* @GST_STREAM_STATUS_TYPE_CREATE: A new thread need to be created.
* @GST_STREAM_STATUS_TYPE_ENTER: a thread entered its loop function
* @GST_STREAM_STATUS_TYPE_LEAVE: a thread left its loop function
* @GST_STREAM_STATUS_TYPE_DESTROY: a thread is destroyed
* @GST_STREAM_STATUS_TYPE_START: a thread is started
* @GST_STREAM_STATUS_TYPE_PAUSE: a thread is paused
* @GST_STREAM_STATUS_TYPE_STOP: a thread is stopped
*
* The type of a %GST_MESSAGE_STREAM_STATUS. The stream status messages inform the
* application of new streaming threads and their status.
*/
typedef enum {
GST_STREAM_STATUS_TYPE_CREATE = 0,
GST_STREAM_STATUS_TYPE_ENTER = 1,
GST_STREAM_STATUS_TYPE_LEAVE = 2,
GST_STREAM_STATUS_TYPE_DESTROY = 3,
GST_STREAM_STATUS_TYPE_START = 8,
GST_STREAM_STATUS_TYPE_PAUSE = 9,
GST_STREAM_STATUS_TYPE_STOP = 10
} GstStreamStatusType;
/**
* GstProgressType:
* @GST_PROGRESS_TYPE_START: A new task started.
* @GST_PROGRESS_TYPE_CONTINUE: A task completed and a new one continues.
* @GST_PROGRESS_TYPE_COMPLETE: A task completed.
* @GST_PROGRESS_TYPE_CANCELED: A task was canceled.
* @GST_PROGRESS_TYPE_ERROR: A task caused an error. An error message is also
* posted on the bus.
*
* The type of a %GST_MESSAGE_PROGRESS. The progress messages inform the
* application of the status of assynchronous tasks.
*/
typedef enum {
GST_PROGRESS_TYPE_START = 0,
GST_PROGRESS_TYPE_CONTINUE = 1,
GST_PROGRESS_TYPE_COMPLETE = 2,
GST_PROGRESS_TYPE_CANCELED = 3,
GST_PROGRESS_TYPE_ERROR = 4
} GstProgressType;
/**
* GstMessage:
* @mini_object: the parent structure
* @type: the #GstMessageType of the message
* @timestamp: the timestamp of the message
* @src: the src of the message
* @seqnum: the sequence number of the message
*
* A #GstMessage.
*/
struct _GstMessage
{
GstMiniObject mini_object;
/*< public > *//* with COW */
GstMessageType type;
guint64 timestamp;
GstObject *src;
guint32 seqnum;
/*< private >*//* with MESSAGE_LOCK */
GMutex lock; /* lock and cond for async delivery */
GCond cond;
};
GType gst_message_get_type (void);
const gchar* gst_message_type_get_name (GstMessageType type);
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_CAST (msg));
}
/**
* gst_message_unref:
* @msg: the message to unref
*
* Convenience macro to decrease the reference count of the message, possibly
* freeing it.
*/
#ifdef _FOOL_GTK_DOC_
G_INLINE_FUNC void gst_message_unref (GstMessage * msg);
#endif
static inline void
gst_message_unref (GstMessage * msg)
{
gst_mini_object_unref (GST_MINI_OBJECT_CAST (msg));
}
/* copy message */
/**
* gst_message_copy:
* @msg: the message to copy
*
* Creates a copy of the message. Returns a copy of the message.
*
* Returns: (transfer full): a new copy of @msg.
*
* MT safe
*/
#ifdef _FOOL_GTK_DOC_
G_INLINE_FUNC GstMessage * gst_message_copy (const GstMessage * msg);
#endif
static inline GstMessage *
gst_message_copy (const GstMessage * msg)
{
return GST_MESSAGE_CAST (gst_mini_object_copy (GST_MINI_OBJECT_CONST_CAST (msg)));
}
/**
* gst_message_is_writable:
* @msg: a #GstMessage
*
* Tests if you can safely write into a message's structure or validly
* modify the seqnum and timestamp fields.
*/
#define gst_message_is_writable(msg) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (msg))
/**
* gst_message_make_writable:
* @msg: (transfer full): the message to make writable
*
* Checks if a message is writable. If not, a writable copy is made and
* returned.
*
* Returns: (transfer full): a message (possibly a duplicate) that is writable.
*
* MT safe
*/
#define gst_message_make_writable(msg) GST_MESSAGE_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (msg)))
/**
* gst_message_replace:
* @old_message: (inout) (transfer full): pointer to a pointer to a #GstMessage
* to be replaced.
* @new_message: (allow-none) (transfer none): pointer to a #GstMessage that will
* replace the message pointed to by @old_message.
*
* Modifies a pointer to a #GstMessage to point to a different #GstMessage. 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
* message is unreffed, the new one is reffed).
*
* Either @new_message or the #GstMessage pointed to by @old_message may be NULL.
*
* Returns: TRUE if @new_message was different from @old_message
*/
#ifdef _FOOL_GTK_DOC_
G_INLINE_FUNC gboolean gst_message_replace (GstMessage **old_message, GstMessage *new_message);
#endif
static inline gboolean
gst_message_replace (GstMessage **old_message, GstMessage *new_message)
{
return gst_mini_object_replace ((GstMiniObject **) old_message, (GstMiniObject *) new_message);
}
/* custom messages */
GstMessage * gst_message_new_custom (GstMessageType type,
GstObject * src,
GstStructure * structure) G_GNUC_MALLOC;
const GstStructure *
gst_message_get_structure (GstMessage *message);
gboolean gst_message_has_name (GstMessage *message, const gchar *name);
/* identifiers for events and messages */
guint32 gst_message_get_seqnum (GstMessage *message);
void gst_message_set_seqnum (GstMessage *message, guint32 seqnum);
/* EOS */
GstMessage * gst_message_new_eos (GstObject * src) G_GNUC_MALLOC;
/* ERROR */
GstMessage * gst_message_new_error (GstObject * src, GError * error, const gchar * debug) G_GNUC_MALLOC;
void gst_message_parse_error (GstMessage *message, GError **gerror, gchar **debug);
/* WARNING */
GstMessage * gst_message_new_warning (GstObject * src, GError * error, const gchar * debug) G_GNUC_MALLOC;
void gst_message_parse_warning (GstMessage *message, GError **gerror, gchar **debug);
/* INFO */
GstMessage * gst_message_new_info (GstObject * src, GError * error, const gchar * debug) G_GNUC_MALLOC;
void gst_message_parse_info (GstMessage *message, GError **gerror, gchar **debug);
/* TAG */
GstMessage * gst_message_new_tag (GstObject * src, GstTagList * tag_list) G_GNUC_MALLOC;
void gst_message_parse_tag (GstMessage *message, GstTagList **tag_list);
/* BUFFERING */
GstMessage * gst_message_new_buffering (GstObject * src, gint percent) G_GNUC_MALLOC;
void gst_message_parse_buffering (GstMessage *message, gint *percent);
void gst_message_set_buffering_stats (GstMessage *message, GstBufferingMode mode,
gint avg_in, gint avg_out,
gint64 buffering_left);
void gst_message_parse_buffering_stats (GstMessage *message, GstBufferingMode *mode,
gint *avg_in, gint *avg_out,
gint64 *buffering_left);
/* STATE_CHANGED */
GstMessage * gst_message_new_state_changed (GstObject * src, GstState oldstate,
GstState newstate, GstState pending) G_GNUC_MALLOC;
void gst_message_parse_state_changed (GstMessage *message, GstState *oldstate,
GstState *newstate, GstState *pending);
/* STATE_DIRTY */
GstMessage * gst_message_new_state_dirty (GstObject * src) G_GNUC_MALLOC;
/* STEP_DONE */
GstMessage * gst_message_new_step_done (GstObject * src, GstFormat format, guint64 amount,
gdouble rate, gboolean flush, gboolean intermediate,
guint64 duration, gboolean eos) G_GNUC_MALLOC;
void gst_message_parse_step_done (GstMessage * message, GstFormat *format, guint64 *amount,
gdouble *rate, gboolean *flush, gboolean *intermediate,
guint64 *duration, gboolean *eos);
/* CLOCK_PROVIDE */
GstMessage * gst_message_new_clock_provide (GstObject * src, GstClock *clock, gboolean ready) G_GNUC_MALLOC;
void gst_message_parse_clock_provide (GstMessage *message, GstClock **clock,
gboolean *ready);
/* CLOCK_LOST */
GstMessage * gst_message_new_clock_lost (GstObject * src, GstClock *clock) G_GNUC_MALLOC;
void gst_message_parse_clock_lost (GstMessage *message, GstClock **clock);
/* NEW_CLOCK */
GstMessage * gst_message_new_new_clock (GstObject * src, GstClock *clock) G_GNUC_MALLOC;
void gst_message_parse_new_clock (GstMessage *message, GstClock **clock);
/* APPLICATION */
GstMessage * gst_message_new_application (GstObject * src, GstStructure * structure) G_GNUC_MALLOC;
/* ELEMENT */
GstMessage * gst_message_new_element (GstObject * src, GstStructure * structure) G_GNUC_MALLOC;
/* SEGMENT_START */
GstMessage * gst_message_new_segment_start (GstObject * src, GstFormat format, gint64 position) G_GNUC_MALLOC;
void gst_message_parse_segment_start (GstMessage *message, GstFormat *format,
gint64 *position);
/* SEGMENT_DONE */
GstMessage * gst_message_new_segment_done (GstObject * src, GstFormat format, gint64 position) G_GNUC_MALLOC;
void gst_message_parse_segment_done (GstMessage *message, GstFormat *format,
gint64 *position);
/* DURATION_CHANGED */
GstMessage * gst_message_new_duration_changed (GstObject * src) G_GNUC_MALLOC;
/* LATENCY */
GstMessage * gst_message_new_latency (GstObject * src) G_GNUC_MALLOC;
/* ASYNC_START */
GstMessage * gst_message_new_async_start (GstObject * src) G_GNUC_MALLOC;
/* ASYNC_DONE */
GstMessage * gst_message_new_async_done (GstObject * src, GstClockTime running_time) G_GNUC_MALLOC;
void gst_message_parse_async_done (GstMessage *message, GstClockTime *running_time);
/* STRUCTURE CHANGE */
GstMessage * gst_message_new_structure_change (GstObject * src, GstStructureChangeType type,
GstElement *owner, gboolean busy) G_GNUC_MALLOC;
void gst_message_parse_structure_change (GstMessage *message, GstStructureChangeType *type,
GstElement **owner, gboolean *busy);
/* STREAM STATUS */
GstMessage * gst_message_new_stream_status (GstObject * src, GstStreamStatusType type,
GstElement *owner) G_GNUC_MALLOC;
void gst_message_parse_stream_status (GstMessage *message, GstStreamStatusType *type,
GstElement **owner);
void gst_message_set_stream_status_object (GstMessage *message, const GValue *object);
const GValue * gst_message_get_stream_status_object (GstMessage *message);
/* REQUEST_STATE */
GstMessage * gst_message_new_request_state (GstObject * src, GstState state) G_GNUC_MALLOC;
void gst_message_parse_request_state (GstMessage * message, GstState *state);
/* STEP_START */
GstMessage * gst_message_new_step_start (GstObject * src, gboolean active, GstFormat format,
guint64 amount, gdouble rate, gboolean flush,
gboolean intermediate) G_GNUC_MALLOC;
void gst_message_parse_step_start (GstMessage * message, gboolean *active, GstFormat *format,
guint64 *amount, gdouble *rate, gboolean *flush,
gboolean *intermediate);
/* QOS */
GstMessage * gst_message_new_qos (GstObject * src, gboolean live, guint64 running_time,
guint64 stream_time, guint64 timestamp, guint64 duration) G_GNUC_MALLOC;
void gst_message_set_qos_values (GstMessage * message, gint64 jitter, gdouble proportion,
gint quality);
void gst_message_set_qos_stats (GstMessage * message, GstFormat format, guint64 processed,
guint64 dropped);
void gst_message_parse_qos (GstMessage * message, gboolean * live, guint64 * running_time,
guint64 * stream_time, guint64 * timestamp, guint64 * duration);
void gst_message_parse_qos_values (GstMessage * message, gint64 * jitter, gdouble * proportion,
gint * quality);
void gst_message_parse_qos_stats (GstMessage * message, GstFormat * format, guint64 * processed,
guint64 * dropped);
/* PROGRESS */
GstMessage * gst_message_new_progress (GstObject * src, GstProgressType type, const gchar *code,
const gchar *text) G_GNUC_MALLOC;
void gst_message_parse_progress (GstMessage * message, GstProgressType * type, gchar ** code,
gchar ** text);
/* TOC */
GstMessage * gst_message_new_toc (GstObject *src, GstToc *toc, gboolean updated);
void gst_message_parse_toc (GstMessage *message, GstToc **toc, gboolean *updated);
/* RESET_TIME */
GstMessage * gst_message_new_reset_time (GstObject * src, GstClockTime running_time) G_GNUC_MALLOC;
void gst_message_parse_reset_time (GstMessage *message, GstClockTime *running_time);
/* STREAM_START */
GstMessage * gst_message_new_stream_start (GstObject * src) G_GNUC_MALLOC;
/* NEED_CONTEXT */
GstMessage * gst_message_new_need_context (GstObject * src) G_GNUC_MALLOC;
void gst_message_add_context_type (GstMessage * message, const gchar * context_type);
guint gst_message_get_n_context_types (GstMessage * message);
gboolean gst_message_parse_nth_context_type (GstMessage * message, guint i, const gchar ** context_type);
/* HAVE_CONTEXT */
GstMessage * gst_message_new_have_context (GstObject * src, GstContext *context) G_GNUC_MALLOC;
void gst_message_parse_have_context (GstMessage *message, GstContext **context);
G_END_DECLS
#endif /* __GST_MESSAGE_H__ */
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