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/*
* gstvaapivideocontext.c - GStreamer/VA video context
*
* Copyright (C) 2010-2011 Splitted-Desktop Systems
* Author: Gwenole Beauchesne <gwenole.beauchesne@splitted-desktop.com>
* Copyright (C) 2011-2013 Intel Corporation
* Author: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
* Copyright (C) 2013 Igalia
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
#include "gstcompat.h"
#include "gstvaapivideocontext.h"
GST_DEBUG_CATEGORY_STATIC (GST_CAT_CONTEXT);
#define GST_VAAPI_TYPE_DISPLAY \
gst_vaapi_display_get_type ()
/* *INDENT-OFF* */
static GType gst_vaapi_display_get_type (void) G_GNUC_CONST;
/* *INDENT-ON* */
G_DEFINE_BOXED_TYPE (GstVaapiDisplay, gst_vaapi_display,
(GBoxedCopyFunc) gst_vaapi_display_ref,
(GBoxedFreeFunc) gst_vaapi_display_unref);
static void
_init_context_debug (void)
{
#ifndef GST_DISABLE_GST_DEBUG
static volatile gsize _init = 0;
if (g_once_init_enter (&_init)) {
GST_DEBUG_CATEGORY_GET (GST_CAT_CONTEXT, "GST_CONTEXT");
g_once_init_leave (&_init, 1);
}
#endif
}
GstContext *
gst_vaapi_video_context_new_with_display (GstVaapiDisplay * display,
gboolean persistent)
{
GstContext *context;
GstStructure *structure;
context = gst_context_new (GST_VAAPI_DISPLAY_CONTEXT_TYPE_NAME, persistent);
structure = gst_context_writable_structure (context);
gst_structure_set (structure, GST_VAAPI_DISPLAY_CONTEXT_TYPE_NAME,
GST_VAAPI_TYPE_DISPLAY, display, NULL);
return context;
}
gboolean
gst_vaapi_video_context_get_display (GstContext * context,
GstVaapiDisplay ** display_ptr)
{
const GstStructure *structure;
g_return_val_if_fail (GST_IS_CONTEXT (context), FALSE);
g_return_val_if_fail (g_strcmp0 (gst_context_get_context_type (context),
GST_VAAPI_DISPLAY_CONTEXT_TYPE_NAME) == 0, FALSE);
structure = gst_context_get_structure (context);
return gst_structure_get (structure, GST_VAAPI_DISPLAY_CONTEXT_TYPE_NAME,
GST_VAAPI_TYPE_DISPLAY, display_ptr, NULL);
}
static gboolean
context_pad_query (const GValue * item, GValue * value, gpointer user_data)
{
GstPad *const pad = g_value_get_object (item);
GstQuery *const query = user_data;
if (gst_pad_peer_query (pad, query)) {
g_value_set_boolean (value, TRUE);
return FALSE;
}
_init_context_debug ();
GST_CAT_INFO_OBJECT (GST_CAT_CONTEXT, pad, "context pad peer query failed");
return TRUE;
}
static gboolean
_gst_context_run_query (GstElement * element, GstQuery * query,
GstPadDirection direction)
{
GstIteratorFoldFunction const func = context_pad_query;
GstIterator *it;
GValue res = { 0 };
g_value_init (&res, G_TYPE_BOOLEAN);
g_value_set_boolean (&res, FALSE);
/* Ask neighbour */
if (direction == GST_PAD_SRC)
it = gst_element_iterate_src_pads (element);
else
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);
return g_value_get_boolean (&res);
}
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)
{
GstQuery *query;
GstMessage *msg;
_init_context_debug ();
/* 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 */
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;
/* 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
gst_vaapi_video_context_propagate (GstElement * element,
GstVaapiDisplay * display)
{
GstContext *context;
GstMessage *msg;
context = gst_vaapi_video_context_new_with_display (display, FALSE);
_init_context_debug ();
GST_CAT_INFO_OBJECT (GST_CAT_CONTEXT, element,
"posting `have-context' (%p) message with display (%p)",
context, display);
msg = gst_message_new_have_context (GST_OBJECT_CAST (element), context);
gst_element_post_message (GST_ELEMENT_CAST (element), msg);
}
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