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08dbe37f6f
Add a function to iterate over all stored events.
202 lines
4.5 KiB
C
202 lines
4.5 KiB
C
/* 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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/**
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* gst_context_foreach:
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* @context: a #GstContext
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* @func: a #GFunc
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* @user_data: user data
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*
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* Call @func with the non NULL event and @user_data.
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*/
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void
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gst_context_foreach (GstContext * context, GFunc func, gpointer user_data)
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{
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guint i;
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GstEvent *event;
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for (i = 0; i < GST_EVENT_MAX_STICKY; i++)
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if ((event = context->events[i]))
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func (event, user_data);
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}
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