gstreamer/gst/gstcontext.h
Wim Taymans 08dbe37f6f context: add foreach function
Add a function to iterate over all stored events.
2011-05-05 13:17:08 +02:00

148 lines
4.6 KiB
C

/* GStreamer
* Copyright (C) 2011 Wim Taymans <wim.taymans@gmail.com>
*
* gstcontext.h: Header for GstContext subsystem
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __GST_CONTEXT_H__
#define __GST_CONTEXT_H__
#include <gst/gstminiobject.h>
#include <gst/gstevent.h>
G_BEGIN_DECLS
#define GST_CONTEXT_TRACE_NAME "GstContext"
typedef struct _GstContext GstContext;
#define GST_TYPE_CONTEXT (gst_context_get_type())
#define GST_IS_CONTEXT(obj) (GST_IS_MINI_OBJECT_TYPE (obj, GST_TYPE_CONTEXT))
#define GST_CONTEXT(obj) ((GstContext *)(obj))
#define GST_CONTEXT_CAST(obj) ((GstContext *)(obj))
/**
* gst_context_is_writable:
* @ctx: a #GstContext
*
* Tests if you can safely update @ctx with new events.
*/
#define gst_context_is_writable(ctx) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (ctx))
/**
* gst_context_make_writable:
* @ctx: (transfer full): a #GstContext
*
* Makes a writable context from the given context. If the source context is
* already writable, this will simply return the same context. A copy will
* otherwise be made using gst_context_copy().
*
* Returns: (transfer full): a writable context which may or may not be the
* same as @ctx
*/
#define gst_context_make_writable(ctx) GST_CONTEXT_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (ctx)))
/**
* gst_context_replace:
* @old_ctx: (inout) (transfer full): pointer to a pointer to a #GstContext
* to be replaced.
* @new_ctx: (allow-none) (transfer none): pointer to a #GstContext that will
* replace the context pointed to by @old_context.
*
* Modifies a pointer to a #GstContext to point to a different #GstContext. The
* modification is done atomically (so this is useful for ensuring thread safety
* in some cases), and the reference counts are updated appropriately (the old
* context is unreffed, the new one is reffed).
*
* Either @new_context or the #GstContext pointed to by @old_context may be NULL.
*/
#define gst_context_replace(old_ctx,new_ctx) \
gst_mini_object_replace ((GstMiniObject **)(old_ctx), GST_MINI_OBJECT_CAST (new_ctx))
GType gst_context_get_type (void);
/* refcounting */
/**
* gst_context_ref:
* @context: The context to refcount
*
* Increase the refcount of this context.
*
* Returns: (transfer full): @context (for convenience when doing assignments)
*/
#ifdef _FOOL_GTK_DOC_
G_INLINE_FUNC GstContext * gst_context_ref (GstContext * context);
#endif
static inline GstContext *
gst_context_ref (GstContext * context)
{
return (GstContext *) gst_mini_object_ref (GST_MINI_OBJECT_CAST (context));
}
/**
* gst_context_unref:
* @context: (transfer full): the context to refcount
*
* Decrease the refcount of an context, freeing it if the refcount reaches 0.
*/
#ifdef _FOOL_GTK_DOC_
G_INLINE_FUNC void gst_context_unref (GstContext * context);
#endif
static inline void
gst_context_unref (GstContext * context)
{
gst_mini_object_unref (GST_MINI_OBJECT_CAST (context));
}
/* copy context */
/**
* gst_context_copy:
* @context: The context to copy
*
* Copy the context using the context specific copy function.
*
* Returns: (transfer full): the new context
*/
#ifdef _FOOL_GTK_DOC_
G_INLINE_FUNC GstContext * gst_context_copy (const GstContext * context);
#endif
static inline GstContext *
gst_context_copy (const GstContext * context)
{
return GST_CONTEXT_CAST (gst_mini_object_copy (GST_MINI_OBJECT_CONST_CAST (context)));
}
GstContext * gst_context_new (void);
/* updating and setting events */
void gst_context_update (GstContext *context, GstEvent *event);
GstEvent * gst_context_get (GstContext *context, GstEventType type);
void gst_context_clear (GstContext *context);
/* foreach */
void gst_context_foreach (GstContext *context, GFunc func, gpointer user_data);
G_END_DECLS
#endif /* __GST_CONTEXT_H__ */