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);
85 GType gst_buffer_list_get_type (void);
88 GstBufferList *gst_buffer_list_new (void);
92 * gst_buffer_list_ref:
93 * @list: a #GstBufferList
95 * Increases the refcount of the given buffer list by one.
97 * Note that the refcount affects the writeability of @list and its data, see
98 * gst_buffer_list_make_writable(). It is important to note that keeping
99 * additional references to GstBufferList instances can potentially increase
100 * the number of memcpy operations in a pipeline.
104 #ifdef _FOOL_GTK_DOC_
105 G_INLINE_FUNC GstBufferList * gst_buffer_list_ref (GstBufferList * list);
108 static inline GstBufferList *
109 gst_buffer_list_ref (GstBufferList * list)
111 return GST_BUFFER_LIST_CAST (gst_mini_object_ref (GST_MINI_OBJECT_CAST (
116 * gst_buffer_list_unref:
117 * @list: a #GstBufferList
119 * Decreases the refcount of the buffer list. If the refcount reaches 0, the
120 * buffer list will be freed.
122 #ifdef _FOOL_GTK_DOC_
123 G_INLINE_FUNC void gst_buffer_list_unref (GstBufferList * list);
127 gst_buffer_list_unref (GstBufferList * list)
129 gst_mini_object_unref (GST_MINI_OBJECT_CAST (list));
134 * gst_buffer_list_copy:
135 * @list: a #GstBufferList
137 * Create a shallow copy of the given buffer list. This will make a newly
138 * allocated copy of the source list with copies of buffer pointers. The
139 * refcount of buffers pointed to will be increased by one.
141 * Returns: a new copy of @list.
143 #ifdef _FOOL_GTK_DOC_
144 G_INLINE_FUNC GstBufferList * gst_buffer_list_copy (const GstBufferList * list);
147 static inline GstBufferList *
148 gst_buffer_list_copy (const GstBufferList * list)
150 return GST_BUFFER_LIST (gst_mini_object_copy (GST_MINI_OBJECT_CAST (list)));
154 * gst_buffer_list_is_writable:
155 * @list: a #GstBufferList
157 * Tests if you can safely add buffers and groups into a buffer list.
159 #define gst_buffer_list_is_writable(list) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (list))
162 * gst_buffer_list_make_writable:
163 * @list: a #GstBufferList
165 * Makes a writable buffer list from the given buffer list. If the source buffer
166 * list is already writable, this will simply return the same buffer list. A
167 * copy will otherwise be made using gst_buffer_list_copy().
169 #define gst_buffer_list_make_writable(list) GST_BUFFER_LIST_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (list)))
171 guint gst_buffer_list_n_groups (GstBufferList *list);
174 GstBufferListIterator * gst_buffer_list_iterate (GstBufferList *list);
175 void gst_buffer_list_iterator_free (GstBufferListIterator *it);
177 guint gst_buffer_list_iterator_n_buffers (const GstBufferListIterator *it);
178 GstBuffer * gst_buffer_list_iterator_next (GstBufferListIterator *it);
179 gboolean gst_buffer_list_iterator_next_group (GstBufferListIterator *it);
181 void gst_buffer_list_iterator_add (GstBufferListIterator *it, GstBuffer *buffer);
182 void gst_buffer_list_iterator_add_group (GstBufferListIterator *it);
183 void gst_buffer_list_iterator_remove (GstBufferListIterator *it);
184 GstBuffer * gst_buffer_list_iterator_steal (GstBufferListIterator *it);
185 void gst_buffer_list_iterator_take (GstBufferListIterator *it, GstBuffer *buffer);
187 GstBuffer * gst_buffer_list_iterator_do (GstBufferListIterator *it, GstBufferListDoFunction do_func);
188 GstBuffer * gst_buffer_list_iterator_do_data (GstBufferListIterator *it, GstBufferListDoDataFunction do_func,
189 gpointer data, GDestroyNotify data_notify);
192 GstBuffer * gst_buffer_list_iterator_merge_group (const GstBufferListIterator *it);
196 #endif /* __GST_BUFFER_LIST_H__ */