mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-29 19:50:40 +00:00
c8380cb0d2
Maybe gcc can do something clever with that, or at least warn us if we don't save the return value somewhere.
243 lines
9 KiB
C
243 lines
9 KiB
C
/* GStreamer
|
|
* Copyright (C) 2009 Axis Communications <dev-gstreamer at axis dot com>
|
|
* @author Jonas Holmberg <jonas dot holmberg at axis dot com>
|
|
*
|
|
* gstbufferlist.h: Header for GstBufferList object
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Library General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#ifndef __GST_BUFFER_LIST_H__
|
|
#define __GST_BUFFER_LIST_H__
|
|
|
|
#include <gst/gstbuffer.h>
|
|
|
|
G_BEGIN_DECLS
|
|
|
|
#define GST_TYPE_BUFFER_LIST (gst_buffer_list_get_type ())
|
|
#define GST_IS_BUFFER_LIST(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_BUFFER_LIST))
|
|
#define GST_IS_BUFFER_LIST_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_BUFFER_LIST))
|
|
#define GST_BUFFER_LIST_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_BUFFER_LIST, GstBufferListClass))
|
|
#define GST_BUFFER_LIST(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_BUFFER_LIST, GstBufferList))
|
|
#define GST_BUFFER_LIST_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_BUFFER_LIST, GstBufferListClass))
|
|
#define GST_BUFFER_LIST_CAST(obj) ((GstBufferList *)obj)
|
|
|
|
#define GST_TYPE_BUFFER_LIST_ITERATOR (gst_buffer_list_iterator_get_type ())
|
|
|
|
typedef struct _GstBufferList GstBufferList;
|
|
typedef struct _GstBufferListClass GstBufferListClass;
|
|
typedef struct _GstBufferListIterator GstBufferListIterator;
|
|
|
|
/**
|
|
* GstBufferListDoFunction:
|
|
* @buffer: (transfer full): the #GstBuffer
|
|
* @user_data: user data
|
|
*
|
|
* A function for accessing the last buffer returned by
|
|
* gst_buffer_list_iterator_next(). The function can leave @buffer in the list,
|
|
* replace @buffer in the list or remove @buffer from the list, depending on
|
|
* the return value. If the function returns NULL, @buffer will be removed from
|
|
* the list, otherwise @buffer will be replaced with the returned buffer.
|
|
*
|
|
* The last buffer returned by gst_buffer_list_iterator_next() will be replaced
|
|
* with the buffer returned from the function. The function takes ownership of
|
|
* @buffer and if a different value than @buffer is returned, @buffer must be
|
|
* unreffed. If NULL is returned, the buffer will be removed from the list. The
|
|
* list must be writable.
|
|
*
|
|
* Returns: (transfer full): the buffer to replace @buffer in the list, or NULL
|
|
* to remove @buffer from the list
|
|
*
|
|
* Since: 0.10.24
|
|
*/
|
|
typedef GstBuffer* (*GstBufferListDoFunction) (GstBuffer * buffer, gpointer user_data);
|
|
|
|
/**
|
|
* GstBufferListItem:
|
|
* @GST_BUFFER_LIST_CONTINUE: Retrieve next buffer
|
|
* @GST_BUFFER_LIST_SKIP_GROUP: Skip to next group
|
|
* @GST_BUFFER_LIST_END: End iteration
|
|
*
|
|
* The result of the #GstBufferListFunc.
|
|
*
|
|
* Since: 0.10.24
|
|
*/
|
|
typedef enum {
|
|
GST_BUFFER_LIST_CONTINUE,
|
|
GST_BUFFER_LIST_SKIP_GROUP,
|
|
GST_BUFFER_LIST_END
|
|
} GstBufferListItem;
|
|
|
|
/**
|
|
* GstBufferListFunc:
|
|
* @buffer: pointer the buffer
|
|
* @group: the group index of @buffer
|
|
* @idx: the index in @group of @buffer
|
|
* @user_data: user data passed to gst_buffer_list_foreach()
|
|
*
|
|
* A function that will be called from gst_buffer_list_foreach(). The @buffer
|
|
* field will point to a the reference of the buffer at @idx in @group.
|
|
*
|
|
* When this function returns #GST_BUFFER_LIST_CONTINUE, the next buffer will be
|
|
* returned. When #GST_BUFFER_LIST_SKIP_GROUP is returned, all remaining buffers
|
|
* in the current group will be skipped and the first buffer of the next group
|
|
* is returned (if any). When GST_BUFFER_LIST_END is returned,
|
|
* gst_buffer_list_foreach() will return.
|
|
*
|
|
* When @buffer is set to NULL, the item will be removed from the bufferlist.
|
|
* When @buffer has been made writable, the new buffer reference can be assigned
|
|
* to @buffer. This function is responsible for unreffing the old buffer when
|
|
* removing or modifying.
|
|
*
|
|
* Returns: a #GstBufferListItem
|
|
*
|
|
* Since: 0.10.24
|
|
*/
|
|
typedef GstBufferListItem (*GstBufferListFunc) (GstBuffer **buffer, guint group, guint idx,
|
|
gpointer user_data);
|
|
|
|
|
|
GType gst_buffer_list_get_type (void);
|
|
|
|
/* allocation */
|
|
GstBufferList *gst_buffer_list_new (void);
|
|
|
|
/* refcounting */
|
|
/**
|
|
* gst_buffer_list_ref:
|
|
* @list: a #GstBufferList
|
|
*
|
|
* Increases the refcount of the given buffer list by one.
|
|
*
|
|
* Note that the refcount affects the writeability of @list and its data, see
|
|
* gst_buffer_list_make_writable(). It is important to note that keeping
|
|
* additional references to GstBufferList instances can potentially increase
|
|
* the number of memcpy operations in a pipeline.
|
|
*
|
|
* Returns: (transfer full): @list
|
|
*
|
|
* Since: 0.10.24
|
|
*/
|
|
#ifdef _FOOL_GTK_DOC_
|
|
G_INLINE_FUNC GstBufferList * gst_buffer_list_ref (GstBufferList * list);
|
|
#endif
|
|
|
|
static inline GstBufferList *
|
|
gst_buffer_list_ref (GstBufferList * list)
|
|
{
|
|
return GST_BUFFER_LIST_CAST (gst_mini_object_ref (GST_MINI_OBJECT_CAST (
|
|
list)));
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_list_unref:
|
|
* @list: (transfer full): a #GstBufferList
|
|
*
|
|
* Decreases the refcount of the buffer list. If the refcount reaches 0, the
|
|
* buffer list will be freed.
|
|
*
|
|
* Since: 0.10.24
|
|
*/
|
|
#ifdef _FOOL_GTK_DOC_
|
|
G_INLINE_FUNC void gst_buffer_list_unref (GstBufferList * list);
|
|
#endif
|
|
|
|
static inline void
|
|
gst_buffer_list_unref (GstBufferList * list)
|
|
{
|
|
gst_mini_object_unref (GST_MINI_OBJECT_CAST (list));
|
|
}
|
|
|
|
/* copy */
|
|
/**
|
|
* gst_buffer_list_copy:
|
|
* @list: a #GstBufferList
|
|
*
|
|
* Create a shallow copy of the given buffer list. This will make a newly
|
|
* allocated copy of the source list with copies of buffer pointers. The
|
|
* refcount of buffers pointed to will be increased by one.
|
|
*
|
|
* Returns: (transfer full): a new copy of @list.
|
|
*
|
|
* Since: 0.10.24
|
|
*/
|
|
#ifdef _FOOL_GTK_DOC_
|
|
G_INLINE_FUNC GstBufferList * gst_buffer_list_copy (const GstBufferList * list);
|
|
#endif
|
|
|
|
static inline GstBufferList *
|
|
gst_buffer_list_copy (const GstBufferList * list)
|
|
{
|
|
return GST_BUFFER_LIST_CAST (gst_mini_object_copy (GST_MINI_OBJECT_CONST_CAST (list)));
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_list_is_writable:
|
|
* @list: a #GstBufferList
|
|
*
|
|
* Tests if you can safely add buffers and groups into a buffer list.
|
|
*
|
|
* Since: 0.10.24
|
|
*/
|
|
#define gst_buffer_list_is_writable(list) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (list))
|
|
|
|
/**
|
|
* gst_buffer_list_make_writable:
|
|
* @list: (transfer full): a #GstBufferList
|
|
*
|
|
* Makes a writable buffer list from the given buffer list. If the source buffer
|
|
* list is already writable, this will simply return the same buffer list. A
|
|
* copy will otherwise be made using gst_buffer_list_copy().
|
|
*
|
|
* Returns: (transfer full): a writable list, which may or may not be the
|
|
* same as @list
|
|
*
|
|
* Since: 0.10.24
|
|
*/
|
|
#define gst_buffer_list_make_writable(list) GST_BUFFER_LIST_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (list)))
|
|
|
|
guint gst_buffer_list_n_groups (GstBufferList *list);
|
|
|
|
void gst_buffer_list_foreach (GstBufferList *list,
|
|
GstBufferListFunc func,
|
|
gpointer user_data);
|
|
GstBuffer * gst_buffer_list_get (GstBufferList *list, guint group, guint idx);
|
|
|
|
/* iterator */
|
|
GType gst_buffer_list_iterator_get_type (void);
|
|
GstBufferListIterator * gst_buffer_list_iterate (GstBufferList *list) G_GNUC_MALLOC;
|
|
void gst_buffer_list_iterator_free (GstBufferListIterator *it);
|
|
|
|
guint gst_buffer_list_iterator_n_buffers (const GstBufferListIterator *it);
|
|
GstBuffer * gst_buffer_list_iterator_next (GstBufferListIterator *it);
|
|
gboolean gst_buffer_list_iterator_next_group (GstBufferListIterator *it);
|
|
|
|
void gst_buffer_list_iterator_add (GstBufferListIterator *it, GstBuffer *buffer);
|
|
void gst_buffer_list_iterator_add_list (GstBufferListIterator *it, GList *list);
|
|
void gst_buffer_list_iterator_add_group (GstBufferListIterator *it);
|
|
void gst_buffer_list_iterator_remove (GstBufferListIterator *it);
|
|
GstBuffer * gst_buffer_list_iterator_steal (GstBufferListIterator *it);
|
|
void gst_buffer_list_iterator_take (GstBufferListIterator *it, GstBuffer *buffer);
|
|
|
|
GstBuffer * gst_buffer_list_iterator_do (GstBufferListIterator *it, GstBufferListDoFunction do_func,
|
|
gpointer user_data);
|
|
|
|
/* conversion */
|
|
GstBuffer * gst_buffer_list_iterator_merge_group (const GstBufferListIterator *it);
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __GST_BUFFER_LIST_H__ */
|