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context: Add persistent qualifier for a context

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Non-persistent contexts are removed when elements go back
to NULL state, persistent contexts are not. Applications
most likely want to set persistent contexts.
This commit is contained in:
Sebastian Dröge 2013-09-17 13:10:53 +02:00
parent a7f5dc8b8a
commit e3ce799217
2 changed files with 31 additions and 4 deletions
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28
gst/gstcontext.c
View file

@ -1,6 +1,7 @@
/* GStreamer /* GStreamer
* Copyright (C) 2013 Collabora Ltd. * Copyright (C) 2013 Collabora Ltd.
* Author: Sebastian Dröge <sebastian.droege@collabora.co.uk> * Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>
* Copyright (C) 2013 Sebastian Dröge <slomo@circular-chaos.org>
* *
* gstcontext.h: Header for GstContext subsystem * gstcontext.h: Header for GstContext subsystem
* *
@ -63,6 +64,7 @@ struct _GstContext
GstMiniObject mini_object; GstMiniObject mini_object;
GstStructure *structure; GstStructure *structure;
gboolean persistent;
}; };
#define GST_CONTEXT_STRUCTURE(c) (((GstContext *)(c))->structure) #define GST_CONTEXT_STRUCTURE(c) (((GstContext *)(c))->structure)
@ -122,6 +124,8 @@ _gst_context_copy (GstContext * context)
gst_structure_set_parent_refcount (GST_CONTEXT_STRUCTURE (copy), gst_structure_set_parent_refcount (GST_CONTEXT_STRUCTURE (copy),
&copy->mini_object.refcount); &copy->mini_object.refcount);
copy->persistent = context->persistent;
return GST_CONTEXT_CAST (copy); return GST_CONTEXT_CAST (copy);
} }
@ -135,6 +139,7 @@ gst_context_init (GstContext * context)
/** /**
* gst_context_new: * gst_context_new:
* @persistent: Persistent context
* *
* Create a new context. * Create a new context.
* *
@ -143,7 +148,7 @@ gst_context_init (GstContext * context)
* Since: 1.2 * Since: 1.2
*/ */
GstContext * GstContext *
gst_context_new (void) gst_context_new (gboolean persistent)
{ {
GstContext *context; GstContext *context;
GstStructure *structure; GstStructure *structure;
@ -157,6 +162,7 @@ gst_context_new (void)
gst_context_init (context); gst_context_init (context);
GST_CONTEXT_STRUCTURE (context) = structure; GST_CONTEXT_STRUCTURE (context) = structure;
context->persistent = persistent;
return context; return context;
} }
@ -174,7 +180,7 @@ gst_context_new (void)
* Since: 1.2 * Since: 1.2
*/ */
const GstStructure * const GstStructure *
gst_context_get_structure (GstContext * context) gst_context_get_structure (const GstContext * context)
{ {
g_return_val_if_fail (GST_IS_CONTEXT (context), NULL); g_return_val_if_fail (GST_IS_CONTEXT (context), NULL);
@ -202,3 +208,21 @@ gst_context_writable_structure (GstContext * context)
return GST_CONTEXT_STRUCTURE (context); return GST_CONTEXT_STRUCTURE (context);
} }
/**
* gst_context_is_persistent:
* @context: The #GstContext.
*
* Check if @context is persistent.
*
* Returns: %TRUE if the context is persistent.
*
* Since: 1.2
*/
gboolean
gst_context_is_persistent (const GstContext * context)
{
g_return_val_if_fail (GST_IS_CONTEXT (context), NULL);
return context->persistent;
}

7
gst/gstcontext.h
View file

@ -1,6 +1,7 @@
/* GStreamer /* GStreamer
* Copyright (C) 2013 Collabora Ltd. * Copyright (C) 2013 Collabora Ltd.
* Author: Sebastian Dröge <sebastian.droege@collabora.co.uk> * Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>
* Copyright (C) 2013 Sebastian Dröge <slomo@circular-chaos.org>
* *
* gstcontext.h: Header for GstContext subsystem * gstcontext.h: Header for GstContext subsystem
* *
@ -143,11 +144,13 @@ gst_context_replace (GstContext **old_context, GstContext *new_context)
return gst_mini_object_replace ((GstMiniObject **) old_context, (GstMiniObject *) new_context); return gst_mini_object_replace ((GstMiniObject **) old_context, (GstMiniObject *) new_context);
} }
GstContext * gst_context_new (void) G_GNUC_MALLOC; GstContext * gst_context_new (gboolean persistent) G_GNUC_MALLOC;
const GstStructure * gst_context_get_structure (GstContext *context); const GstStructure * gst_context_get_structure (const GstContext *context);
GstStructure * gst_context_writable_structure (GstContext *context); GstStructure * gst_context_writable_structure (GstContext *context);
gboolean gst_context_is_persistent (const GstContext * context);
G_END_DECLS G_END_DECLS
#endif /* __GST_CONTEXT_H__ */ #endif /* __GST_CONTEXT_H__ */