Commit cb981302 authored by Wim Taymans's avatar Wim Taymans

Implement STRUCTURE_CHANGED messages. These messages will be used to signal...

Implement STRUCTURE_CHANGED messages. These messages will be used to signal the parent bin of link/unlink operations ...

Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
* gst/gstmessage.c: (gst_message_new_structure_change),
(gst_message_parse_structure_change):
* gst/gstmessage.h:
Implement STRUCTURE_CHANGED messages. These messages will be used to
signal the parent bin of link/unlink operations that could require a
resync when doing a state change. See ##510354.
API: gst_message_new_structure_change()
API: gst_message_parse_structure_change()
parent 11588b2d
2008-10-06 Wim Taymans <wim.taymans@collabora.co.uk>
* docs/gst/gstreamer-sections.txt:
* gst/gstmessage.c: (gst_message_new_structure_change),
(gst_message_parse_structure_change):
* gst/gstmessage.h:
Implement STRUCTURE_CHANGED messages. These messages will be used to
signal the parent bin of link/unlink operations that could require a
resync when doing a state change. See ##510354.
API: gst_message_new_structure_change()
API: gst_message_parse_structure_change()
2008-10-06 Wim Taymans <wim.taymans@collabora.co.uk>
* gst/gstquark.c:
......@@ -1019,6 +1019,7 @@ gst_iterator_result_get_type
<TITLE>GstMessage</TITLE>
GstMessage
GstMessageType
GstStructureChangeType
GST_MESSAGE_SRC
GST_MESSAGE_TIMESTAMP
GST_MESSAGE_TYPE
......@@ -1067,7 +1068,8 @@ gst_message_new_latency
gst_message_new_async_start
gst_message_parse_async_start
gst_message_new_async_done
gst_message_new_structure_change
gst_message_parse_structure_change
<SUBSECTION Standard>
GstMessageClass
GST_MESSAGE
......@@ -1078,9 +1080,11 @@ GST_MESSAGE_CLASS
GST_IS_MESSAGE_CLASS
GST_MESSAGE_GET_CLASS
GST_TYPE_MESSAGE_TYPE
GST_TYPE_STRUCTURE_CHANGE_TYPE
<SUBSECTION Private>
gst_message_get_type
gst_message_type_get_type
gst_structure_change_type_get_type
GST_MESSAGE_COND
GST_MESSAGE_GET_LOCK
GST_MESSAGE_LOCK
......
......@@ -622,6 +622,48 @@ gst_message_new_new_clock (GstObject * src, GstClock * clock)
return message;
}
/**
* gst_message_new_structure_change:
* @src: The object originating the message.
* @type: The change type.
* @owner: The owner element of @src.
* @busy: Whether the structure change is busy.
*
* Create a new structure change message. This message is posted when the
* structure of a pipeline is in the process of being changed, for example
* when pads are linked or unlinked.
*
* @src should be the srcpad that unlinked or linked.
*
* Returns: The new structure change message.
*
* MT safe.
*
* Since: 0.10.22.
*/
GstMessage *
gst_message_new_structure_change (GstObject * src, GstStructureChangeType type,
GstElement * owner, gboolean busy)
{
GstMessage *message;
GstStructure *structure;
g_return_val_if_fail (GST_IS_PAD (src), NULL);
g_return_val_if_fail (GST_PAD_DIRECTION (src) == GST_PAD_SRC, NULL);
g_return_val_if_fail (GST_IS_ELEMENT (owner), NULL);
structure = gst_structure_empty_new ("GstMessageStructureChange");
gst_structure_id_set (structure,
GST_QUARK (TYPE), GST_TYPE_STRUCTURE_CHANGE_TYPE, type,
GST_QUARK (OWNER), GST_TYPE_ELEMENT, owner,
GST_QUARK (BUSY), G_TYPE_BOOLEAN, busy, NULL);
message = gst_message_new_custom (GST_MESSAGE_STRUCTURE_CHANGE, src,
structure);
return message;
}
/**
* gst_message_new_segment_start:
* @src: The object originating the message.
......@@ -1071,6 +1113,45 @@ gst_message_parse_new_clock (GstMessage * message, GstClock ** clock)
*clock = (GstClock *) g_value_get_object (clock_gvalue);
}
/**
* gst_message_parse_structure_change:
* @message: A valid #GstMessage of type GST_MESSAGE_STRUCTURE_CHANGE.
* @type: A pointer to hold the change type
* @owner: The owner element of the message source
* @busy: A pointer to hold whether the change is in progress or has been
* completed
*
* Extracts the change type and completion status from the GstMessage.
*
* MT safe.
*
* Since: 0.10.22
*/
void
gst_message_parse_structure_change (GstMessage * message,
GstStructureChangeType * type, GstElement ** owner, gboolean * busy)
{
const GValue *owner_gvalue;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_STRUCTURE_CHANGE);
owner_gvalue =
gst_structure_id_get_value (message->structure, GST_QUARK (OWNER));
g_return_if_fail (owner_gvalue != NULL);
g_return_if_fail (G_VALUE_TYPE (owner_gvalue) == GST_TYPE_ELEMENT);
if (type)
*type = g_value_get_enum (gst_structure_id_get_value (message->structure,
GST_QUARK (TYPE)));
if (owner)
*owner = (GstElement *) g_value_get_object (owner_gvalue);
if (busy)
*busy =
g_value_get_boolean (gst_structure_id_get_value (message->structure,
GST_QUARK (BUSY)));
}
/**
* gst_message_parse_error:
* @message: A valid #GstMessage of type GST_MESSAGE_ERROR.
......
......@@ -58,8 +58,8 @@ typedef struct _GstMessageClass GstMessageClass;
* 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_STRUCTURE_CHANGE: the structure of the pipeline changed. Not
* implemented yet.
* @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.. Not implemented yet.
* @GST_MESSAGE_APPLICATION: message posted by the application, possibly
......@@ -179,6 +179,20 @@ typedef enum
*/
#define GST_MESSAGE_SRC(message) (GST_MESSAGE(message)->src)
/**
* 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 #GstMessageStructureChange.
*
* Since: 0.10.22
*/
typedef enum {
GST_STRUCTURE_CHANGE_TYPE_PAD_LINK = 0,
GST_STRUCTURE_CHANGE_TYPE_PAD_UNLINK = 1
} GstStructureChangeType;
/**
* GstMessage:
* @mini_object: the parent structure
......@@ -353,6 +367,12 @@ void gst_message_parse_async_start (GstMessage *message, gboolean *new_base_tim
/* ASYNC_DONE */
GstMessage * gst_message_new_async_done (GstObject * src);
/* STRUCTURE CHANGE */
GstMessage * gst_message_new_structure_change (GstObject * src, GstStructureChangeType type,
GstElement *owner, gboolean busy);
void gst_message_parse_structure_change (GstMessage *message, GstStructureChangeType *type,
GstElement **owner, gboolean *busy);
/* custom messages */
GstMessage * gst_message_new_custom (GstMessageType type,
GstObject * src,
......
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