2 * Copyright (C) 2009 Axis Communications <dev-gstreamer at axis dot com>
3 * @author Jonas Holmberg <jonas dot holmberg at axis dot com>
5 * gstbufferlist.h: Header for GstBufferList object
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
23 #ifndef __GST_BUFFER_LIST_H__
24 #define __GST_BUFFER_LIST_H__
26 #include <gst/gstbuffer.h>
30 #define GST_TYPE_BUFFER_LIST (gst_buffer_list_get_type ())
31 #define GST_IS_BUFFER_LIST(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_BUFFER_LIST))
32 #define GST_IS_BUFFER_LIST_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_BUFFER_LIST))
33 #define GST_BUFFER_LIST_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_BUFFER_LIST, GstBufferListClass))
34 #define GST_BUFFER_LIST(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_BUFFER_LIST, GstBufferList))
35 #define GST_BUFFER_LIST_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_BUFFER_LIST, GstBufferListClass))
36 #define GST_BUFFER_LIST_CAST(obj) ((GstBufferList *)obj)
38 typedef struct _GstBufferList GstBufferList;
39 typedef struct _GstBufferListClass GstBufferListClass;
40 typedef struct _GstBufferListIterator GstBufferListIterator;
43 * GstBufferListDoFunction:
44 * @buffer: the #GstBuffer
46 * A function for accessing the last buffer returned by
47 * gst_buffer_list_iterator_next(). The function can leave @buffer in the list,
48 * replace @buffer in the list or remove @buffer from the list, depending on
49 * the return value. If the function returns NULL, @buffer will be removed from
50 * the list, otherwise @buffer will be replaced with the returned buffer.
52 * The last buffer returned by gst_buffer_list_iterator_next() will be replaced
53 * with the buffer returned from the function. The function takes ownership of
54 * @buffer and if a different value than @buffer is returned, @buffer must be
55 * unreffed. If NULL is returned, the buffer will be removed from the list. The
56 * list must be writable.
58 * Returns: the buffer to replace @buffer in the list, or NULL to remove @buffer
61 typedef GstBuffer* (*GstBufferListDoFunction) (GstBuffer * buffer);
64 * GstBufferListDoDataFunction:
65 * @buffer: the #GstBuffer
66 * @data: the gpointer to optional user data.
68 * A function for accessing the last buffer returned by
69 * gst_buffer_list_iterator_next(). The function can leave @buffer in the list,
70 * replace @buffer in the list or remove @buffer from the list, depending on
71 * the return value. If the function returns NULL, @buffer will be removed from
72 * the list, otherwise @buffer will be replaced with the returned buffer.
74 * The last buffer returned by gst_buffer_list_iterator_next() will be replaced
75 * with the buffer returned from the function. The function takes ownership of
76 * @buffer and if a different value than @buffer is returned, @buffer must be
77 * unreffed. If NULL is returned, the buffer will be removed from the list. The
78 * list must be writable.
80 * Returns: the buffer to replace @buffer in the list, or NULL to remove @buffer
83 typedef GstBuffer* (*GstBufferListDoDataFunction) (GstBuffer * buffer, gpointer data);
87 * @mini_object: the parent structure
89 * List of grouped buffers.
91 struct _GstBufferList {
92 GstMiniObject mini_object;
97 gpointer _gst_reserved[GST_PADDING];
100 struct _GstBufferListClass {
101 GstMiniObjectClass mini_object_class;
104 GType gst_buffer_list_get_type (void);
107 GstBufferList *gst_buffer_list_new (void);
111 * gst_buffer_list_ref:
112 * @list: a #GstBufferList
114 * Increases the refcount of the given buffer list by one.
116 * Note that the refcount affects the writeability of @list and its data, see
117 * gst_buffer_list_make_writable(). It is important to note that keeping
118 * additional references to GstBufferList instances can potentially increase
119 * the number of memcpy operations in a pipeline.
123 #ifdef _FOOL_GTK_DOC_
124 G_INLINE_FUNC GstBufferList * gst_buffer_list_ref (GstBufferList * list);
127 static inline GstBufferList *
128 gst_buffer_list_ref (GstBufferList * list)
130 return GST_BUFFER_LIST_CAST (gst_mini_object_ref (GST_MINI_OBJECT_CAST (
135 * gst_buffer_list_unref:
136 * @list: a #GstBufferList
138 * Decreases the refcount of the buffer list. If the refcount reaches 0, the
139 * buffer list will be freed.
141 #ifdef _FOOL_GTK_DOC_
142 G_INLINE_FUNC void gst_buffer_list_unref (GstBufferList * list);
146 gst_buffer_list_unref (GstBufferList * list)
148 gst_mini_object_unref (GST_MINI_OBJECT_CAST (list));
153 * gst_buffer_list_copy:
154 * @list: a #GstBufferList
156 * Create a shallow copy of the given buffer list. This will make a newly
157 * allocated copy of the source list with copies of buffer pointers. The
158 * refcount of buffers pointed to will be increased by one.
160 * Returns: a new copy of @list.
162 #ifdef _FOOL_GTK_DOC_
163 G_INLINE_FUNC GstBufferList * gst_buffer_list_copy (const GstBufferList * list);
166 static inline GstBufferList *
167 gst_buffer_list_copy (const GstBufferList * list)
169 return GST_BUFFER_LIST (gst_mini_object_copy (GST_MINI_OBJECT_CAST (list)));
173 * gst_buffer_list_is_writable:
174 * @list: a #GstBufferList
176 * Tests if you can safely add buffers and groups into a buffer list.
178 #define gst_buffer_list_is_writable(list) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (list))
181 * gst_buffer_list_make_writable:
182 * @list: a #GstBufferList
184 * Makes a writable buffer list from the given buffer list. If the source buffer
185 * list is already writable, this will simply return the same buffer list. A
186 * copy will otherwise be made using gst_buffer_list_copy().
188 #define gst_buffer_list_make_writable(list) GST_BUFFER_LIST_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (list)))
190 guint gst_buffer_list_n_groups (GstBufferList *list);
193 GstBufferListIterator * gst_buffer_list_iterate (GstBufferList *list);
194 void gst_buffer_list_iterator_free (GstBufferListIterator *it);
196 guint gst_buffer_list_iterator_n_buffers (const GstBufferListIterator *it);
197 GstBuffer * gst_buffer_list_iterator_next (GstBufferListIterator *it);
198 gboolean gst_buffer_list_iterator_next_group (GstBufferListIterator *it);
200 void gst_buffer_list_iterator_add (GstBufferListIterator *it, GstBuffer *buffer);
201 void gst_buffer_list_iterator_add_group (GstBufferListIterator *it);
202 void gst_buffer_list_iterator_remove (GstBufferListIterator *it);
203 GstBuffer * gst_buffer_list_iterator_steal (GstBufferListIterator *it);
204 void gst_buffer_list_iterator_take (GstBufferListIterator *it, GstBuffer *buffer);
206 GstBuffer * gst_buffer_list_iterator_do (GstBufferListIterator *it, GstBufferListDoFunction do_func);
207 GstBuffer * gst_buffer_list_iterator_do_data (GstBufferListIterator *it, GstBufferListDoDataFunction do_func,
208 gpointer data, GDestroyNotify data_notify);
211 GstBuffer * gst_buffer_list_iterator_merge_group (const GstBufferListIterator *it);
215 #endif /* __GST_BUFFER_LIST_H__ */