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vaapivideocontext: refactor gst_vaapi_video_context_prepare()

Browse source 
First, refactorized run_context_query() into _gst_context_run_query(), adding
a new parameter: the pad direction, in order to simplify the code.

Second, added a new helper function: _gst_context_query(), which is a generic
context query function.  It isolates the operation of running the query and
sets the context if found, also it enhances the logs.

_gst_context_query() is similar to the one used in GstGL. Perhaps, in the
future this helper function will be merged into the core libraries of
GStreamer.

Finally, gst_vaapi_video_context_prepare() was rewritten to use
_gst_context_query().

Signed-off-by: Víctor Manuel Jáquez Leal <victorx.jaquez@intel.com>

https://bugzilla.gnome.org/show_bug.cgi?id=757598
This commit is contained in:
Víctor Manuel Jáquez Leal 2015-11-04 19:02:34 +01:00
parent 7e9ee7f66d
commit 5d0ab36924
1 changed files with 64 additions and 41 deletions
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105
gst/vaapi/gstvaapivideocontext.c
View file

@ -98,7 +98,8 @@ context_pad_query (const GValue * item, GValue * value, gpointer user_data)
}
static gboolean
run_context_query (GstElement * element, GstQuery * query)
_gst_context_run_query (GstElement * element, GstQuery * query,
GstPadDirection direction)
{
GstIteratorFoldFunction const func = context_pad_query;
GstIterator *it;
@ -107,17 +108,12 @@ run_context_query (GstElement * element, GstQuery * query)
g_value_init (&res, G_TYPE_BOOLEAN);
g_value_set_boolean (&res, FALSE);
/* Ask downstream neighbour */
it = gst_element_iterate_src_pads (element);
while (gst_iterator_fold (it, func, &res, query) == GST_ITERATOR_RESYNC)
gst_iterator_resync (it);
gst_iterator_free (it);
/* Ask neighbour */
if (direction == GST_PAD_SRC)
it = gst_element_iterate_src_pads (element);
else
it = gst_element_iterate_sink_pads (element);
if (g_value_get_boolean (&res))
return TRUE;
/* If none, ask upstream neighbour (auto-plugged case) */
it = gst_element_iterate_sink_pads (element);
while (gst_iterator_fold (it, func, &res, query) == GST_ITERATOR_RESYNC)
gst_iterator_resync (it);
gst_iterator_free (it);
@ -125,53 +121,80 @@ run_context_query (GstElement * element, GstQuery * query)
return g_value_get_boolean (&res);
}
void
gst_vaapi_video_context_prepare (GstElement * element)
static gboolean
_gst_context_get_from_query (GstElement * element, GstQuery * query,
GstPadDirection direction)
{
GstContext *ctxt;
if (!_gst_context_run_query (element, query, direction))
return FALSE;
gst_query_parse_context (query, &ctxt);
GST_CAT_INFO_OBJECT (GST_CAT_CONTEXT, element,
"found context (%" GST_PTR_FORMAT ") in %s query", ctxt,
direction == GST_PAD_SRC ? "downstream" : "upstream");
gst_element_set_context (element, ctxt);
return TRUE;
}
static void
_gst_context_query (GstElement * element, const gchar * context_type)
{
GstContext *context;
GstQuery *query;
GstMessage *msg;
_init_context_debug ();
/* 1) Check if the element already has a context of the specific
* type, i.e. it was previously set via
* gst_element_set_context(). */
/* This was already done by the caller of this function:
* gst_vaapi_ensure_display() */
/* 2) Query downstream with GST_QUERY_CONTEXT for the context and
check if downstream already has a context of the specific
type */
/* 3) Query upstream with GST_QUERY_CONTEXT for the context and
check if upstream already has a context of the specific
type */
context = NULL;
query = gst_query_new_context (GST_VAAPI_DISPLAY_CONTEXT_TYPE_NAME);
if (run_context_query (element, query)) {
gst_query_parse_context (query, &context);
GST_CAT_INFO_OBJECT (GST_CAT_CONTEXT, element,
"found context (%p) in query", context);
gst_element_set_context (element, context);
} else {
/* 4) Post a GST_MESSAGE_NEED_CONTEXT message on the bus with
the required context types and afterwards check if an
usable context was set now as in 1). The message could
be handled by the parent bins of the element and the
application. */
GST_CAT_INFO_OBJECT (GST_CAT_CONTEXT, element,
"posting `need-context' message");
msg = gst_message_new_need_context (GST_OBJECT_CAST (element),
GST_VAAPI_DISPLAY_CONTEXT_TYPE_NAME);
gst_element_post_message (element, msg);
query = gst_query_new_context (context_type);
if (_gst_context_get_from_query (element, query, GST_PAD_SRC))
goto found;
if (_gst_context_get_from_query (element, query, GST_PAD_SINK))
goto found;
/* The check of an usable context is done by the caller:
gst_vaapi_ensure_display() */
}
/* 4) Post a GST_MESSAGE_NEED_CONTEXT message on the bus with
the required context types and afterwards check if an
usable context was set now as in 1). The message could
be handled by the parent bins of the element and the
application. */
GST_CAT_INFO_OBJECT (GST_CAT_CONTEXT, element,
"posting `need-context' message");
msg = gst_message_new_need_context (GST_OBJECT_CAST (element), context_type);
gst_element_post_message (element, msg);
/*
* Whomever responds to the need-context message performs a
* GstElement::set_context() with the required context in which the
* element is required to update the display_ptr
*/
found:
gst_query_unref (query);
}
void
gst_vaapi_video_context_prepare (GstElement * element)
{
g_return_if_fail (element != NULL);
/* 1) Check if the element already has a context of the specific
* type, i.e. it was previously set via
* gst_element_set_context(). */
/* This was already done by the caller of this function:
* gst_vaapi_ensure_display() */
_gst_context_query (element, GST_VAAPI_DISPLAY_CONTEXT_TYPE_NAME);
/* The check of an usable context is done by the caller:
gst_vaapi_ensure_display() */
}
/* 5) Create a context by itself and post a GST_MESSAGE_HAVE_CONTEXT message
on the bus. */
void