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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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context: add helper object to manage events
Add a helper object to manage the events that define the context of a buffer and a stream.
This commit is contained in:
Wim Taymans
parent
7d3fabc521
commit
0fee137dbc
4 changed files with 331 additions and 1 deletions
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@ -56,6 +56,7 @@ libgstreamer_@GST_MAJORMINOR@_la_SOURCES = \
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gstcaps.c \
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gstcaps.c \
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gstchildproxy.c \
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gstchildproxy.c \
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gstclock.c \
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gstclock.c \
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gstcontext.c \
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gstdatetime.c \
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gstdatetime.c \
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gstdebugutils.c \
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gstdebugutils.c \
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gstelement.c \
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gstelement.c \
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@ -151,6 +152,7 @@ gst_headers = \
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gstchildproxy.h \
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gstchildproxy.h \
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gstclock.h \
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gstclock.h \
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gstcompat.h \
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gstcompat.h \
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gstcontext.h \
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gstdatetime.h \
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gstdatetime.h \
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gstdebugutils.h \
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gstdebugutils.h \
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gstelement.h \
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gstelement.h \
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183
gst/gstcontext.c
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183
gst/gstcontext.c
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@ -0,0 +1,183 @@
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/* GStreamer
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* Copyright (C) 2011 Wim Taymans <wim.taymans@gmail.com>
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*
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* gstcontext.c: GstContext subsystem
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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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/**
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* SECTION:gstcontext
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* @short_description: Structure containing events describing the context
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* for buffers in a pipeline
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* @see_also: #GstPad, #GstBuffer
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*
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* Last reviewed on 2011-05-4 (0.11.0)
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*/
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#include "gst_private.h"
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#include "gstinfo.h"
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#include "gstcontext.h"
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#include "gstutils.h"
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#include "gstquark.h"
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struct _GstContext
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{
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GstMiniObject mini_object;
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/*< private > */
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GstEvent *events[GST_EVENT_MAX_STICKY];
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gpointer _gst_reserved[GST_PADDING];
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};
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static GType _gst_context_type = 0;
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GType
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gst_context_get_type (void)
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{
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if (G_UNLIKELY (_gst_context_type == 0)) {
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_gst_context_type = gst_mini_object_register ("GstContext");
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}
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return _gst_context_type;
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}
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static void
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_gst_context_free (GstContext * context)
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{
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g_return_if_fail (context != NULL);
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g_return_if_fail (GST_IS_CONTEXT (context));
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GST_LOG ("freeing context %p", context);
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gst_context_clear (context);
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g_slice_free1 (GST_MINI_OBJECT_SIZE (context), context);
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}
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static void gst_context_init (GstContext * context, gsize size);
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static GstContext *
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_gst_context_copy (GstContext * context)
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{
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GstContext *copy;
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guint i;
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copy = g_slice_new0 (GstContext);
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gst_context_init (copy, sizeof (GstContext));
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for (i = 0; i < GST_EVENT_MAX_STICKY; i++)
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gst_event_replace (©->events[i], context->events[i]);
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return copy;
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}
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static void
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gst_context_init (GstContext * context, gsize size)
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{
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gst_mini_object_init (GST_MINI_OBJECT_CAST (context), _gst_context_type,
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size);
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context->mini_object.copy = (GstMiniObjectCopyFunction) _gst_context_copy;
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context->mini_object.free = (GstMiniObjectFreeFunction) _gst_context_free;
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}
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/**
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* gst_context_new:
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*
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* Create a new #GstContext object that can be used to manage events.
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*
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* Returns: (transfer full): a new #GstContext
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*/
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GstContext *
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gst_context_new (void)
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{
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GstContext *context;
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context = g_slice_new0 (GstContext);
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GST_DEBUG ("creating new context %p", context);
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gst_context_init (context, sizeof (GstContext));
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return context;
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}
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/**
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* gst_context_update:
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* @context: a #GstContext
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* @event: a #GstEvent
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*
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* Update @context with @event. The context must be writable.
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*/
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void
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gst_context_update (GstContext * context, GstEvent * event)
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{
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guint idx;
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g_return_if_fail (context != NULL);
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g_return_if_fail (gst_context_is_writable (context));
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idx = GST_EVENT_STICKY_IDX (event);
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GST_LOG ("storing event %s at index %u", GST_EVENT_TYPE_NAME (event), idx);
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gst_event_replace (&context->events[idx], event);
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}
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/**
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* gst_context_get:
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* @context: a #GstContext
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* @type: a #GstEventType
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*
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* Get the event of @type from @context.
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*
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* Returns: the last #GstEvent of @type that was updated on @context. This
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* function returns NULL when there is no event with the given type.
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*/
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GstEvent *
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gst_context_get (GstContext * context, GstEventType type)
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{
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guint idx;
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GstEvent *event = NULL;
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g_return_val_if_fail (context != NULL, NULL);
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idx = GST_EVENT_STICKY_IDX_TYPE (type);
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if ((event = context->events[idx]))
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gst_event_ref (event);
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return event;
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}
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/**
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* gst_context_clear:
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* @context: a #GstContext
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*
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* Clear all stored events in @context
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*/
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void
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gst_context_clear (GstContext * context)
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{
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guint i;
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for (i = 0; i < GST_EVENT_MAX_STICKY; i++)
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gst_event_replace (&context->events[i], NULL);
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}
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144
gst/gstcontext.h
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144
gst/gstcontext.h
Normal file
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@ -0,0 +1,144 @@
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/* GStreamer
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* Copyright (C) 2011 Wim Taymans <wim.taymans@gmail.com>
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*
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* gstcontext.h: Header for GstContext subsystem
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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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#ifndef __GST_CONTEXT_H__
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#define __GST_CONTEXT_H__
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#include <gst/gstminiobject.h>
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#include <gst/gstevent.h>
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G_BEGIN_DECLS
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#define GST_CONTEXT_TRACE_NAME "GstContext"
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typedef struct _GstContext GstContext;
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#define GST_TYPE_CONTEXT (gst_context_get_type())
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#define GST_IS_CONTEXT(obj) (GST_IS_MINI_OBJECT_TYPE (obj, GST_TYPE_CONTEXT))
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#define GST_CONTEXT(obj) ((GstContext *)(obj))
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#define GST_CONTEXT_CAST(obj) ((GstContext *)(obj))
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/**
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* gst_context_is_writable:
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* @ctx: a #GstContext
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*
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* Tests if you can safely update @ctx with new events.
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*/
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#define gst_context_is_writable(ctx) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (ctx))
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/**
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* gst_context_make_writable:
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* @ctx: (transfer full): a #GstContext
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*
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* Makes a writable context from the given context. If the source context is
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* already writable, this will simply return the same context. A copy will
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* otherwise be made using gst_context_copy().
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*
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* Returns: (transfer full): a writable context which may or may not be the
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* same as @ctx
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*/
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#define gst_context_make_writable(ctx) GST_CONTEXT_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (buf)))
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/**
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* gst_context_replace:
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* @old_ctx: (inout) (transfer full): pointer to a pointer to a #GstContext
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* to be replaced.
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* @new_ctx: (allow-none) (transfer none): pointer to a #GstContext that will
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* replace the context pointed to by @old_context.
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*
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* Modifies a pointer to a #GstContext to point to a different #GstContext. The
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* modification is done atomically (so this is useful for ensuring thread safety
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* in some cases), and the reference counts are updated appropriately (the old
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* context is unreffed, the new one is reffed).
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*
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* Either @new_context or the #GstContext pointed to by @old_context may be NULL.
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*/
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#define gst_context_replace(old_ctx,new_ctx) \
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gst_mini_object_replace ((GstMiniObject **)(old_ctx), GST_MINI_OBJECT_CAST (new_ctx))
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GType gst_context_get_type (void);
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/* refcounting */
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/**
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* gst_context_ref:
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* @context: The context to refcount
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*
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* Increase the refcount of this context.
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*
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* Returns: (transfer full): @context (for convenience when doing assignments)
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*/
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#ifdef _FOOL_GTK_DOC_
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G_INLINE_FUNC GstContext * gst_context_ref (GstContext * context);
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#endif
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static inline GstContext *
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gst_context_ref (GstContext * context)
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{
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return (GstContext *) gst_mini_object_ref (GST_MINI_OBJECT_CAST (context));
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}
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/**
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* gst_context_unref:
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* @context: (transfer full): the context to refcount
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*
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* Decrease the refcount of an context, freeing it if the refcount reaches 0.
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*/
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#ifdef _FOOL_GTK_DOC_
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G_INLINE_FUNC void gst_context_unref (GstContext * context);
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#endif
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static inline void
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gst_context_unref (GstContext * context)
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{
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gst_mini_object_unref (GST_MINI_OBJECT_CAST (context));
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}
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/* copy context */
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/**
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* gst_context_copy:
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* @context: The context to copy
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*
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* Copy the context using the context specific copy function.
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*
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* Returns: (transfer full): the new context
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*/
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#ifdef _FOOL_GTK_DOC_
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G_INLINE_FUNC GstContext * gst_context_copy (const GstContext * context);
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#endif
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static inline GstContext *
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gst_context_copy (const GstContext * context)
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{
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return GST_CONTEXT_CAST (gst_mini_object_copy (GST_MINI_OBJECT_CONST_CAST (context)));
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}
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GstContext * gst_context_new (void);
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void gst_context_update (GstContext *context, GstEvent *event);
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GstEvent * gst_context_get (GstContext *context, GstEventType type);
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void gst_context_clear (GstContext *context);
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G_END_DECLS
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#endif /* __GST_CONTEXT_H__ */
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@ -80,7 +80,8 @@ typedef enum {
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#define FLAG(name) GST_EVENT_TYPE_##name
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#define FLAG(name) GST_EVENT_TYPE_##name
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#define GST_EVENT_STICKY_IDX(ev) ((GST_EVENT_TYPE(ev) >> GST_EVENT_STICKY_SHIFT) & 0xf)
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#define GST_EVENT_STICKY_IDX_TYPE(type) (((type) >> GST_EVENT_STICKY_SHIFT) & 0xf)
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#define GST_EVENT_STICKY_IDX(ev) GST_EVENT_STICKY_IDX_TYPE(GST_EVENT_TYPE(ev))
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/**
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/**
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* GstEventType:
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* GstEventType:
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