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09141c6e1f
Since we started depending on GLib 2.44, we can be sure this macro is defined (it will be a no-op on compilers that don't support it). For plugins we should just start using `G_DECLARE_FINAL_TYPE` which means we no longer need the macro there, but for most types in core we don't want to break ABI, which means it's better to just keep it like it is (and use the `#ifdef` instead).
246 lines
8.2 KiB
C
246 lines
8.2 KiB
C
/* GStreamer
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* Copyright (C) 2009 Axis Communications <dev-gstreamer at axis dot com>
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* @author Jonas Holmberg <jonas dot holmberg at axis dot com>
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*
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* gstbufferlist.h: Header for GstBufferList object
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_BUFFER_LIST_H__
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#define __GST_BUFFER_LIST_H__
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#include <gst/gstbuffer.h>
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G_BEGIN_DECLS
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GST_API GType _gst_buffer_list_type;
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#define GST_TYPE_BUFFER_LIST (_gst_buffer_list_type)
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#define GST_IS_BUFFER_LIST(obj) (GST_IS_MINI_OBJECT_TYPE(obj, GST_TYPE_BUFFER_LIST))
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#define GST_BUFFER_LIST_CAST(obj) ((GstBufferList *)obj)
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#define GST_BUFFER_LIST(obj) (GST_BUFFER_LIST_CAST(obj))
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typedef struct _GstBufferList GstBufferList;
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/**
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* GstBufferListFunc:
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* @buffer: (out) (nullable): pointer the buffer
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* @idx: the index of @buffer
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* @user_data: user data passed to gst_buffer_list_foreach()
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*
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* A function that will be called from gst_buffer_list_foreach(). The @buffer
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* field will point to a the reference of the buffer at @idx.
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*
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* When this function returns %TRUE, the next buffer will be
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* returned. When %FALSE is returned, gst_buffer_list_foreach() will return.
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*
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* When @buffer is set to %NULL, the item will be removed from the bufferlist.
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* When @buffer has been made writable, the new buffer reference can be assigned
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* to @buffer. This function is responsible for unreffing the old buffer when
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* removing or modifying.
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*
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* Returns: %FALSE when gst_buffer_list_foreach() should stop
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*/
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typedef gboolean (*GstBufferListFunc) (GstBuffer **buffer, guint idx,
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gpointer user_data);
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/* refcounting */
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/**
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* gst_buffer_list_ref: (skip)
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* @list: a #GstBufferList
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*
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* Increases the refcount of the given buffer list by one.
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*
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* Note that the refcount affects the writability of @list and its data, see
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* gst_buffer_list_make_writable(). It is important to note that keeping
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* additional references to GstBufferList instances can potentially increase
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* the number of memcpy operations in a pipeline.
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*
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* Returns: (transfer full): @list
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*/
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static inline GstBufferList* gst_buffer_list_ref(GstBufferList* list);
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static inline GstBufferList *
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gst_buffer_list_ref (GstBufferList * list)
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{
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return GST_BUFFER_LIST_CAST (gst_mini_object_ref (GST_MINI_OBJECT_CAST (
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list)));
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}
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/**
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* gst_buffer_list_unref: (skip)
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* @list: (transfer full): a #GstBufferList
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*
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* Decreases the refcount of the buffer list. If the refcount reaches 0, the
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* buffer list will be freed.
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*/
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static inline void gst_buffer_list_unref(GstBufferList* list);
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static inline void
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gst_buffer_list_unref(GstBufferList* list)
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{
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gst_mini_object_unref (GST_MINI_OBJECT_CAST (list));
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}
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/**
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* gst_clear_buffer_list: (skip)
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* @list_ptr: a pointer to a #GstBufferList reference
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*
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* Clears a reference to a #GstBufferList.
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*
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* @list_ptr must not be %NULL.
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*
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* If the reference is %NULL then this function does nothing. Otherwise, the
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* reference count of the list is decreased and the pointer is set to %NULL.
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*
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* Since: 1.16
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*/
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static inline void
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gst_clear_buffer_list (GstBufferList ** list_ptr)
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{
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gst_clear_mini_object ((GstMiniObject **) list_ptr);
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}
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/* copy */
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/**
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* gst_buffer_list_copy: (skip)
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* @list: a #GstBufferList
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*
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* Create a shallow copy of the given buffer list. This will make a newly
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* allocated copy of the source list with copies of buffer pointers. The
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* refcount of buffers pointed to will be increased by one.
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*
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* Returns: (transfer full): a new copy of @list.
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*/
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static inline GstBufferList* gst_buffer_list_copy(const GstBufferList* list);
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static inline GstBufferList *
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gst_buffer_list_copy (const GstBufferList * list)
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{
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return GST_BUFFER_LIST_CAST (gst_mini_object_copy (GST_MINI_OBJECT_CONST_CAST (list)));
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}
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/**
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* gst_buffer_list_replace:
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* @old_list: (inout) (transfer full) (nullable): pointer to a pointer to a
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* #GstBufferList to be replaced.
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* @new_list: (transfer none) (allow-none): pointer to a #GstBufferList that
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* will replace the buffer list pointed to by @old_list.
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*
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* Modifies a pointer to a #GstBufferList to point to a different
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* #GstBufferList. The modification is done atomically (so this is useful for
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* ensuring thread safety in some cases), and the reference counts are updated
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* appropriately (the old buffer list is unreffed, the new is reffed).
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*
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* Either @new_list or the #GstBufferList pointed to by @old_list may be %NULL.
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*
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* Returns: %TRUE if @new_list was different from @old_list
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*
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* Since: 1.16
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*/
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static inline gboolean
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gst_buffer_list_replace (GstBufferList **old_list, GstBufferList *new_list)
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{
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return gst_mini_object_replace ((GstMiniObject **) old_list,
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(GstMiniObject *) new_list);
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}
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/**
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* gst_buffer_list_take:
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* @old_list: (inout) (transfer full): pointer to a pointer to a #GstBufferList
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* to be replaced.
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* @new_list: (transfer full) (allow-none): pointer to a #GstBufferList
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* that will replace the bufferlist pointed to by @old_list.
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*
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* Modifies a pointer to a #GstBufferList to point to a different
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* #GstBufferList. This function is similar to gst_buffer_list_replace() except
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* that it takes ownership of @new_list.
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*
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* Returns: %TRUE if @new_list was different from @old_list
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*
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* Since: 1.16
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*/
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static inline gboolean
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gst_buffer_list_take (GstBufferList **old_list, GstBufferList *new_list)
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{
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return gst_mini_object_take ((GstMiniObject **) old_list,
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(GstMiniObject *) new_list);
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}
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/**
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* gst_buffer_list_is_writable:
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* @list: a #GstBufferList
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*
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* Tests if you can safely add buffers and groups into a buffer list.
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*/
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#define gst_buffer_list_is_writable(list) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (list))
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/**
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* gst_buffer_list_make_writable:
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* @list: (transfer full): a #GstBufferList
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*
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* Makes a writable buffer list from the given buffer list. If the source buffer
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* list is already writable, this will simply return the same buffer list. A
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* copy will otherwise be made using gst_buffer_list_copy().
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*
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* Returns: (transfer full): a writable list, which may or may not be the
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* same as @list
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*/
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#define gst_buffer_list_make_writable(list) GST_BUFFER_LIST_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (list)))
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GST_API
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GType gst_buffer_list_get_type (void);
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/* allocation */
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GST_API
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GstBufferList * gst_buffer_list_new (void) G_GNUC_MALLOC;
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GST_API
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GstBufferList * gst_buffer_list_new_sized (guint size) G_GNUC_MALLOC;
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GST_API
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guint gst_buffer_list_length (GstBufferList *list);
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GST_API
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GstBuffer * gst_buffer_list_get (GstBufferList *list, guint idx);
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GST_API
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GstBuffer * gst_buffer_list_get_writable (GstBufferList *list, guint idx);
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GST_API
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void gst_buffer_list_insert (GstBufferList *list, gint idx, GstBuffer *buffer);
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GST_API
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void gst_buffer_list_remove (GstBufferList *list, guint idx, guint length);
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GST_API
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gboolean gst_buffer_list_foreach (GstBufferList *list,
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GstBufferListFunc func,
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gpointer user_data);
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GST_API
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GstBufferList * gst_buffer_list_copy_deep (const GstBufferList * list);
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GST_API
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gsize gst_buffer_list_calculate_size (GstBufferList * list);
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#define gst_buffer_list_add(l,b) gst_buffer_list_insert((l),-1,(b));
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G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstBufferList, gst_buffer_list_unref)
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G_END_DECLS
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#endif /* __GST_BUFFER_LIST_H__ */
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