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244 lines
8 KiB
C
244 lines
8 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:
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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 *
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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:
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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
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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:
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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 *
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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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#ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
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G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstBufferList, gst_buffer_list_unref)
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#endif
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G_END_DECLS
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#endif /* __GST_BUFFER_LIST_H__ */
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