2011-10-19 20:19:51 +00:00
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/* GStreamer
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*
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* Copyright (C) 2011 Intel
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* Copyright (C) 2011 Collabora Ltd.
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* Author: Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>
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*
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* video-context.c: Video Context interface and helpers
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*
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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 Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "videocontext.h"
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/**
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* SECTION:gstvideocontext
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* @short_description: Interface to handle video library context
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*
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* The Video Context interface enable sharing video context (such as display
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* name, X11 Display, VA-API Display, etc) between neighboor elements and the
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* application.
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* <note>
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* The GstVideoContext interface is unstable API and may change in future.
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* One can define GST_USE_UNSTABLE_API to acknowledge and avoid this warning.
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* </note>
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*
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* <refsect2>
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* <title>For Element</title>
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* <para>
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* This interface shall be implement by group of elements that need to share
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* a specific video context (like VDPAU, LibVA, OpenGL elements) or by video
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* sink in order to let the application select appropriate display information
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* (like the X11 display name) when those sink are auto-plugged.
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* </para>
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* <para>
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* Along with implementing the interface, elements will need to query
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* neighboor elements or send message to the application when preparing
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* the context (see gst_video_context_prepare()). They also need to reply
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* to the neighboors element queries, so the context can be shared without
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* the application help.
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* </para>
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* <para>
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* Elements that are guarantied to have both upstream and downstream
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* neighboors element implementing the #GstVideoContext (like the gloverlay
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* element in gst-plugins-opengl) is not required to also implement the
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* interface. Relying on neighboors query shall be sufficient (see
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* gst_video_context_run_query()).
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* </para>
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* <para>
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* The query is an application query with a structure name set to
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* "prepare-video-context" and an array of supported video context types set
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* in the field named "types". This query shall be send downstream and
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* upstream, iterating the pads in order to find neighboors regardless of a
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* static (sink to src) or a dynamic (src to sink) activation. Element should
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* used the helpers method gst_video_context_prepare() (or
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* gst_video_context_run_query() if no GstVideoContext interface) to
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* correctly execute the query . The result is set using the query helper
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* functions, the structures fields name being "video-context-type" as
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* string and "video-context" as a #GValue.
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* </para>
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* <para>
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* If the query is not handled by any neighboor, the element should ask the
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* application using the "prepare-video-context" message. The application
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* may then use the interface to set the video context information. If no
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* context was set, the element shall create one using default configuration.
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* Elements with multiple src or sink pad shall implement proper locking to
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* prevent the race of parallel queries being replied.
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* </para>
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* <para>
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* Well known video-context are: "x11-display-name" a string representing the
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* X11 display to use, "x11-display" the X11 Display structure, "va-display",
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* the VADisplay structure and more.
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* </para>
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* </refsect2>
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*
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* <refsect2>
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* <title>For Application</title>
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* <para>
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* In the case there is no neighboor element with video context to share,
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* the element will first turn toward the application, by sending a
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* "prepare-video-context" message. This message is sent along with a list
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* of supported display types. The application can optionally reply to this
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* message by calling appropriate setter through the #GstVideoContext
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* interface. If the application supports more then one video context type,
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* it should choose the first one to occure in the supported list. It's
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* important to remember that the message is delivered from the streaming
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* thread, and appropriate locking should be considered. If the application
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* does not have a video context to share, the element will simply allocate
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* one base on default settings. Usually, only applications using OpenGL
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* base sink, or running on special X11 display need to share a video context.
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* <note>
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* Applications sharing X11 Display structure should always initialize the
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* X11 threading support using XInitThreads() as GStreamer will need to
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* manipulate the display from a separeate threads.
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* </note>
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* </para>
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* <refsect2>
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* <title>Example using ClutterVideoGstVideoSink</title>
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* <para>
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* This example is for user of ClutterGstVideoSink element, the
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* ClutterGstPlayer object transparently handle this.
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* </para>
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* |[
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* #if CLUTTER_WINDOWING_X11
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* static GstBusSyncReply
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* on_sync_message (GstBus * bus, GstMessage * message, gpointer user_data)
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* {
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* Display *display = user_data;
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* GstVideoContext *context;
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* const gchar **types;
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*
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* if (gst_video_context_message_parse_prepare (message, &types, &context)) {
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* gint i;
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*
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* for (i = 0; types[i]; i++) {
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*
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* if (!strcmp(types[i], "x11-display")) {
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* gst_video_context_set_context_pointer (context, "x11-display", display);
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* }
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* else if (!strcmp(types[i], "x11-display-name")) {
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* gst_video_context_set_context_string (context, "x11-display-name",
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* DisplayString (display));
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* } else {
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* continue;
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* }
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*
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* gst_message_unref (message);
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* return GST_BUS_DROP;
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* }
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* }
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*
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* return GST_BUS_PASS;
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* }
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* #endif
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*
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* gint
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* main (gint argc, gchar **argv)
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* {
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* GstBin *pipeline;
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* GstBus *bus;
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*
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* ...
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*
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* bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
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*
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* #if CLUTTER_WINDOWING_X11
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* gst_bus_set_sync_handler (priv->bus, on_sync_message,
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* clutter_x11_get_default_display ());
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* #endif
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*
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* gst_object_unref (GST_OBJECT (priv->bus));
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*
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* ...
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* }
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* ]|
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* </refsect2>
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* </refsect2>
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*/
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G_DEFINE_INTERFACE (GstVideoContext, gst_video_context_iface, G_TYPE_INVALID);
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static inline GstStructure *
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gst_video_context_new_structure (const gchar ** types)
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{
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return gst_structure_new ("prepare-video-context",
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"types", G_TYPE_STRV, types, NULL);
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}
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static gboolean
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2011-11-04 10:24:53 +00:00
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gst_video_context_pad_query (const GValue * item, GValue * value,
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gpointer user_data)
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2011-10-19 20:19:51 +00:00
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{
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2011-11-04 10:24:53 +00:00
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GstPad *pad = g_value_get_object (item);
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2011-10-19 20:19:51 +00:00
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GstQuery *query = user_data;
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gboolean res;
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res = gst_pad_peer_query (pad, query);
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if (res) {
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g_value_set_boolean (value, TRUE);
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return FALSE;
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}
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return TRUE;
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}
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static void
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gst_video_context_iface_default_init (GstVideoContextInterface * iface)
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{
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/* default virtual functions */
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iface->set_context = NULL;
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}
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/**
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* gst_video_context_set_context:
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* @context: an element implementing #GstVideoContext
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* @type: the type of display being set
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* @value: a #GValue containing the context
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*
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* This is a wrapper for the set_context() virtual method. It is suggested to
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* use one of the helpers to avoid having to manipulate #GValue
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*/
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void
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gst_video_context_set_context (GstVideoContext * context, const gchar * type,
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const GValue * value)
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{
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g_return_if_fail (GST_IS_VIDEO_CONTEXT (context));
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g_return_if_fail (GST_VIDEO_CONTEXT_GET_IFACE (context)->set_context);
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GST_VIDEO_CONTEXT_GET_IFACE (context)->set_context (context, type, value);
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}
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/**
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* gst_video_context_set_context_string:
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* @context: an element implementing #GstVideoContext
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* @type: the type of display being set
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* @string: a string representing the video context
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*
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* This helper is commonly used for setting video context represented by a
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* string like the X11 display name ("x11-display-name")/
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*/
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void
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gst_video_context_set_context_string (GstVideoContext * context,
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const gchar * type, const gchar * string)
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{
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GValue value = { 0 };
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g_value_init (&value, G_TYPE_STRING);
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g_value_set_string (&value, string);
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gst_video_context_set_context (context, type, &value);
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g_value_unset (&value);
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}
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/**
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* gst_video_context_set_context_pointer:
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* @context: an element implementing #GstVideoContext
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* @type: the type of display being set
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* @pointer: a pointer to the video context
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*
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* This helper is used for setting video context using a pointer, typically to
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* a structure like the X11 Display ("x11-display") or the VADisplay
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* ("vaapi-display").
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* <note>
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* Users of X11 Display should ensure that XInitThreads() was called before
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* opening the display.
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* </note>
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*/
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void
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gst_video_context_set_context_pointer (GstVideoContext * context,
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const gchar * type, gpointer pointer)
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{
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GValue value = { 0 };
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g_value_init (&value, G_TYPE_POINTER);
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g_value_set_pointer (&value, pointer);
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gst_video_context_set_context (context, type, &value);
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g_value_unset (&value);
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}
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/**
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* gst_video_context_set_context_object:
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* @context: an element implementing #GstVideoContext
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* @type: the type of display being set
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* @object: a #GObject resenting the display
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*
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* This is for video context that are #GObject, this helper allow taking
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* benifit of the #GObject refcounting. It is particularly handy for element
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* to have refcounting as the order in which element will stop using the
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* display is not defined.
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*/
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void
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gst_video_context_set_context_object (GstVideoContext * context,
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const gchar * type, GObject * object)
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{
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GValue value = { 0 };
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g_return_if_fail (G_IS_OBJECT (object));
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g_value_init (&value, G_TYPE_OBJECT);
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g_value_set_object (&value, object);
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gst_video_context_set_context (context, type, &value);
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g_value_unset (&value);
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}
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/**
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* gst_video_context_prepare:
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* @context: an element implementing #GstVideoContext interface
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* @types: an array of supported types, prefered first
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*
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* This method run "prepare-video-context" custom query dowstream, and
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* upstream. If * the query has a reply, it sets the context value using
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* gst_video_context_set_context(). Otherwise, it sends a
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* "prepare-video-context" message to the application. The element can then
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* continue video context initialization.
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*/
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void
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gst_video_context_prepare (GstVideoContext * context, const gchar ** types)
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{
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GstQuery *query = gst_video_context_query_new (types);
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/* Check neighborhood, if found call GstVideoContext */
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if (gst_video_context_run_query (GST_ELEMENT (context), query)) {
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const gchar *type = NULL;
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const GValue *value;
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gst_video_context_query_parse_value (query, &type, &value);
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gst_video_context_set_context (context, type, value);
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} else {
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/* If no neighbor replyed, query the application */
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GstMessage *message;
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GstStructure *structure;
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structure = gst_video_context_new_structure (types);
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message = gst_message_new_element (GST_OBJECT (context), structure);
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gst_element_post_message (GST_ELEMENT (context), message);
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}
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gst_query_unref (query);
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}
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/**
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* gst_video_context_message_parse_prepare:
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* @message: a #GstMessage
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* @types: return value for supported types
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* @context: return value for the element the implements #GstVideoContext
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*
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* This helper shall be used by application to simply handling of the
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* "prepare-video-context" message.
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*
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* Rerturns: #FALSE is the message was not valid "prepare-video-context"
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* element message, otherwise #TRUE with @types and @context set.
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*/
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gboolean
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gst_video_context_message_parse_prepare (GstMessage * message,
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const gchar *** types, GstVideoContext ** context)
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{
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GstObject *src = GST_MESSAGE_SRC (message);
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const GstStructure *structure;
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const GValue *value;
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if (GST_MESSAGE_TYPE (message) != GST_MESSAGE_ELEMENT)
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return FALSE;
|
|
|
|
|
2011-11-04 10:24:53 +00:00
|
|
|
if (!gst_message_has_name (message, "prepare-video-context"))
|
2011-10-19 20:19:51 +00:00
|
|
|
return FALSE;
|
|
|
|
|
|
|
|
if (!GST_IS_VIDEO_CONTEXT (src))
|
|
|
|
return FALSE;
|
|
|
|
|
|
|
|
structure = gst_message_get_structure (message);
|
|
|
|
value = gst_structure_get_value (structure, "types");
|
|
|
|
|
|
|
|
if (!G_VALUE_HOLDS (value, G_TYPE_STRV))
|
|
|
|
return FALSE;
|
|
|
|
|
|
|
|
if (types)
|
|
|
|
*types = g_value_get_boxed (value);
|
|
|
|
|
|
|
|
if (context)
|
|
|
|
*context = GST_VIDEO_CONTEXT (src);
|
|
|
|
|
|
|
|
return TRUE;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gst_video_context_query_new:
|
|
|
|
* @types: a string array of video context types
|
|
|
|
*
|
|
|
|
* Create a new custom #GstQuery with structure name "prepare-video-context".
|
|
|
|
*/
|
|
|
|
GstQuery *
|
|
|
|
gst_video_context_query_new (const gchar ** types)
|
|
|
|
{
|
|
|
|
GstStructure *structure = gst_video_context_new_structure (types);
|
2011-11-04 10:24:53 +00:00
|
|
|
return gst_query_new_custom (GST_QUERY_CUSTOM, structure);
|
2011-10-19 20:19:51 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gst_video_context_run_query:
|
|
|
|
* @element: a #GstElement
|
|
|
|
* @query: a #GstQuery
|
|
|
|
*
|
|
|
|
* This helper runs the query on each downstream, then upstream pads in an
|
|
|
|
* element. This is called by gst_video_context_prepare(). This method is only
|
|
|
|
* used directly within elements that are required to have two neighboors
|
|
|
|
* elements with appropriate video context. This would be the case of
|
|
|
|
* specialized filters that only manipulate non-raw buffers (e.g.
|
|
|
|
* gldeinterlace). Those elements do not have to implement #GstVideoContext
|
|
|
|
* interface.
|
|
|
|
*/
|
|
|
|
gboolean
|
|
|
|
gst_video_context_run_query (GstElement * element, GstQuery * query)
|
|
|
|
{
|
|
|
|
GstIterator *it;
|
|
|
|
GstIteratorFoldFunction func = gst_video_context_pad_query;
|
|
|
|
GValue res = { 0 };
|
|
|
|
|
|
|
|
g_value_init (&res, G_TYPE_BOOLEAN);
|
|
|
|
g_value_set_boolean (&res, FALSE);
|
|
|
|
|
|
|
|
/* Ask downstream neighbor (mainly static pipeline case) */
|
|
|
|
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);
|
|
|
|
|
|
|
|
/* If none, ask upstream neighbor (auto-plugged case) */
|
|
|
|
if (!g_value_get_boolean (&res)) {
|
|
|
|
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);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gst_video_context_query_get_supported_types:
|
|
|
|
* @query: a #GstQuery
|
|
|
|
*
|
|
|
|
* Returns: An array of supported video context types
|
|
|
|
*/
|
|
|
|
const gchar **
|
|
|
|
gst_video_context_query_get_supported_types (GstQuery * query)
|
|
|
|
{
|
2011-11-04 10:24:53 +00:00
|
|
|
const GstStructure *structure = gst_query_get_structure (query);
|
2011-10-19 20:19:51 +00:00
|
|
|
const GValue *value = gst_structure_get_value (structure, "types");
|
|
|
|
|
|
|
|
if (G_VALUE_HOLDS (value, G_TYPE_STRV))
|
|
|
|
return g_value_get_boxed (value);
|
|
|
|
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gst_video_context_query_parse_value:
|
|
|
|
* @query: a #GstQuery
|
|
|
|
* @type: return video context type
|
|
|
|
* @value: return video context #GValue
|
|
|
|
*
|
|
|
|
* Helper to extract the video context type and value from a #GstQuery.
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
gst_video_context_query_parse_value (GstQuery * query, const gchar ** type,
|
|
|
|
const GValue ** value)
|
|
|
|
{
|
2011-11-04 10:24:53 +00:00
|
|
|
const GstStructure *structure = gst_query_get_structure (query);
|
2011-10-19 20:19:51 +00:00
|
|
|
|
|
|
|
if (type)
|
|
|
|
*type = gst_structure_get_string (structure, "video-context-type");
|
|
|
|
|
|
|
|
if (value)
|
|
|
|
*value = gst_structure_get_value (structure, "video-context");
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gst_video_context_query_set_value:
|
|
|
|
* @query: a #GstQuery
|
|
|
|
* @type: the video context type
|
|
|
|
* @value: a #GValue set with video context
|
|
|
|
*
|
|
|
|
* Helper to set the video context as a #GValue inside the #GstQuery.
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
gst_video_context_query_set_value (GstQuery * query, const gchar * type,
|
|
|
|
GValue * value)
|
|
|
|
{
|
2011-11-04 10:24:53 +00:00
|
|
|
GstStructure *structure = gst_query_writable_structure (query);
|
2011-10-19 20:19:51 +00:00
|
|
|
gst_structure_set (structure, "video-context-type", G_TYPE_STRING, type,
|
|
|
|
"video-context", G_TYPE_VALUE, value, NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gst_video_context_query_set_string:
|
|
|
|
* @query: a #GstQuery
|
|
|
|
* @type: the video context type
|
|
|
|
* @value: a string representing the video context
|
|
|
|
*
|
|
|
|
* Helper to set the video context as a string inside the #GstQuery.
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
gst_video_context_query_set_string (GstQuery * query, const gchar * type,
|
|
|
|
const gchar * value)
|
|
|
|
{
|
2011-11-04 10:24:53 +00:00
|
|
|
GstStructure *structure = gst_query_writable_structure (query);
|
2011-10-19 20:19:51 +00:00
|
|
|
gst_structure_set (structure, "video-context-type", G_TYPE_STRING, type,
|
|
|
|
"video-context", G_TYPE_STRING, value, NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gst_video_context_query_set_pointer:
|
|
|
|
* @query: a #GstQuery
|
|
|
|
* @type: the video context type
|
|
|
|
* @value: a #gpointer representing the video context
|
|
|
|
*
|
|
|
|
* Helper to set the video context as a #gpointer inside the #GstQuery.
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
gst_video_context_query_set_pointer (GstQuery * query, const gchar * type,
|
|
|
|
gpointer value)
|
|
|
|
{
|
2011-11-04 10:24:53 +00:00
|
|
|
GstStructure *structure = gst_query_writable_structure (query);
|
2011-10-19 20:19:51 +00:00
|
|
|
gst_structure_set (structure, "video-context-type", G_TYPE_STRING, type,
|
|
|
|
"video-context", G_TYPE_POINTER, value, NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gst_video_context_query_set_object:
|
|
|
|
* @query: a #GstQuery
|
|
|
|
* @type: the video context type
|
|
|
|
* @value: a #GObject representing the video context
|
|
|
|
*
|
|
|
|
* Helper to set the video context as a #GObject inside the #GstQuery.
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
gst_video_context_query_set_object (GstQuery * query, const gchar * type,
|
|
|
|
GObject * value)
|
|
|
|
{
|
2011-11-04 10:24:53 +00:00
|
|
|
GstStructure *structure = gst_query_writable_structure (query);
|
2011-10-19 20:19:51 +00:00
|
|
|
gst_structure_set (structure, "video-context-type", G_TYPE_STRING, type,
|
|
|
|
"video-context", G_TYPE_OBJECT, value, NULL);
|
|
|
|
}
|