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Since the context messages are sync'ed, the display assignation happens in the same thread, hence we can know if the display was found or not as soon we call for it. In order to take advantage of it, gst_vaapi_video_context_prepare() receives, as a new parameter, the address of the plugin's display, and reports back if the display was found and set. Signed-off-by: Víctor Manuel Jáquez Leal <victorx.jaquez@intel.com> https://bugzilla.gnome.org/show_bug.cgi?id=757598
222 lines
6.7 KiB
C
222 lines
6.7 KiB
C
/*
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* gstvaapivideocontext.c - GStreamer/VA video context
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*
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* Copyright (C) 2010-2011 Splitted-Desktop Systems
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* Author: Gwenole Beauchesne <gwenole.beauchesne@splitted-desktop.com>
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* Copyright (C) 2011-2013 Intel Corporation
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* Author: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
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* Copyright (C) 2013 Igalia
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1
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* of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA
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*/
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#include "gstcompat.h"
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#include "gstvaapivideocontext.h"
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GST_DEBUG_CATEGORY_STATIC (GST_CAT_CONTEXT);
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#define GST_VAAPI_TYPE_DISPLAY \
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gst_vaapi_display_get_type ()
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/* *INDENT-OFF* */
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static GType gst_vaapi_display_get_type (void) G_GNUC_CONST;
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/* *INDENT-ON* */
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G_DEFINE_BOXED_TYPE (GstVaapiDisplay, gst_vaapi_display,
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(GBoxedCopyFunc) gst_vaapi_display_ref,
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(GBoxedFreeFunc) gst_vaapi_display_unref);
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static void
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_init_context_debug (void)
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{
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#ifndef GST_DISABLE_GST_DEBUG
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static volatile gsize _init = 0;
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if (g_once_init_enter (&_init)) {
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GST_DEBUG_CATEGORY_GET (GST_CAT_CONTEXT, "GST_CONTEXT");
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g_once_init_leave (&_init, 1);
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}
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#endif
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}
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GstContext *
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gst_vaapi_video_context_new_with_display (GstVaapiDisplay * display,
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gboolean persistent)
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{
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GstContext *context;
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GstStructure *structure;
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context = gst_context_new (GST_VAAPI_DISPLAY_CONTEXT_TYPE_NAME, persistent);
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structure = gst_context_writable_structure (context);
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gst_structure_set (structure, GST_VAAPI_DISPLAY_CONTEXT_TYPE_NAME,
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GST_VAAPI_TYPE_DISPLAY, display, NULL);
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return context;
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}
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gboolean
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gst_vaapi_video_context_get_display (GstContext * context,
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GstVaapiDisplay ** display_ptr)
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{
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const GstStructure *structure;
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g_return_val_if_fail (GST_IS_CONTEXT (context), FALSE);
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g_return_val_if_fail (g_strcmp0 (gst_context_get_context_type (context),
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GST_VAAPI_DISPLAY_CONTEXT_TYPE_NAME) == 0, FALSE);
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structure = gst_context_get_structure (context);
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return gst_structure_get (structure, GST_VAAPI_DISPLAY_CONTEXT_TYPE_NAME,
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GST_VAAPI_TYPE_DISPLAY, display_ptr, NULL);
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}
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static gboolean
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context_pad_query (const GValue * item, GValue * value, gpointer user_data)
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{
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GstPad *const pad = g_value_get_object (item);
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GstQuery *const query = user_data;
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if (gst_pad_peer_query (pad, query)) {
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g_value_set_boolean (value, TRUE);
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return FALSE;
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}
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_init_context_debug ();
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GST_CAT_INFO_OBJECT (GST_CAT_CONTEXT, pad, "context pad peer query failed");
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return TRUE;
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}
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static gboolean
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_gst_context_run_query (GstElement * element, GstQuery * query,
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GstPadDirection direction)
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{
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GstIteratorFoldFunction const func = context_pad_query;
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GstIterator *it;
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GValue res = { 0 };
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g_value_init (&res, G_TYPE_BOOLEAN);
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g_value_set_boolean (&res, FALSE);
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/* Ask neighbour */
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if (direction == GST_PAD_SRC)
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it = gst_element_iterate_src_pads (element);
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else
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it = gst_element_iterate_sink_pads (element);
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while (gst_iterator_fold (it, func, &res, query) == GST_ITERATOR_RESYNC)
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gst_iterator_resync (it);
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gst_iterator_free (it);
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return g_value_get_boolean (&res);
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}
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static gboolean
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_gst_context_get_from_query (GstElement * element, GstQuery * query,
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GstPadDirection direction)
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{
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GstContext *ctxt;
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if (!_gst_context_run_query (element, query, direction))
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return FALSE;
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gst_query_parse_context (query, &ctxt);
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GST_CAT_INFO_OBJECT (GST_CAT_CONTEXT, element,
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"found context (%" GST_PTR_FORMAT ") in %s query", ctxt,
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direction == GST_PAD_SRC ? "downstream" : "upstream");
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gst_element_set_context (element, ctxt);
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return TRUE;
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}
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static void
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_gst_context_query (GstElement * element, const gchar * context_type)
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{
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GstQuery *query;
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GstMessage *msg;
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_init_context_debug ();
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/* 2) Query downstream with GST_QUERY_CONTEXT for the context and
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check if downstream already has a context of the specific
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type */
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/* 3) Query upstream with GST_QUERY_CONTEXT for the context and
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check if upstream already has a context of the specific
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type */
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query = gst_query_new_context (context_type);
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if (_gst_context_get_from_query (element, query, GST_PAD_SRC))
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goto found;
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if (_gst_context_get_from_query (element, query, GST_PAD_SINK))
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goto found;
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/* 4) Post a GST_MESSAGE_NEED_CONTEXT message on the bus with
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the required context types and afterwards check if an
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usable context was set now as in 1). The message could
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be handled by the parent bins of the element and the
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application. */
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GST_CAT_INFO_OBJECT (GST_CAT_CONTEXT, element,
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"posting `need-context' message");
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msg = gst_message_new_need_context (GST_OBJECT_CAST (element), context_type);
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gst_element_post_message (element, msg);
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/*
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* Whomever responds to the need-context message performs a
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* GstElement::set_context() with the required context in which the
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* element is required to update the display_ptr
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*/
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found:
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gst_query_unref (query);
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}
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gboolean
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gst_vaapi_video_context_prepare (GstElement * element,
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GstVaapiDisplay ** display_ptr)
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{
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g_return_val_if_fail (element != NULL, FALSE);
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g_return_val_if_fail (display_ptr != NULL, FALSE);
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/* 1) Check if the element already has a context of the specific
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* type.
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*/
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if (*display_ptr) {
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GST_LOG_OBJECT (element, "already have a display (%p)", *display_ptr);
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return TRUE;
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}
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_gst_context_query (element, GST_VAAPI_DISPLAY_CONTEXT_TYPE_NAME);
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if (*display_ptr)
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GST_LOG_OBJECT (element, "found a display (%p)", *display_ptr);
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return *display_ptr != NULL;
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}
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/* 5) Create a context by itself and post a GST_MESSAGE_HAVE_CONTEXT message
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on the bus. */
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void
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gst_vaapi_video_context_propagate (GstElement * element,
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GstVaapiDisplay * display)
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{
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GstContext *context;
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GstMessage *msg;
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context = gst_vaapi_video_context_new_with_display (display, FALSE);
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gst_element_set_context (element, context);
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_init_context_debug ();
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GST_CAT_INFO_OBJECT (GST_CAT_CONTEXT, element,
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"posting `have-context' (%p) message with display (%p)",
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context, display);
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msg = gst_message_new_have_context (GST_OBJECT_CAST (element), context);
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gst_element_post_message (GST_ELEMENT_CAST (element), msg);
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}
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