gstreamer/gst/gstbufferlist.h
Tim-Philipp Müller 8983cce9f6 gst: GST_EXPORT -> GST_API
We need different export decorators for the different libs.
For now no actual change though, just rename before the release,
and add prelude headers to define the new decorator to GST_EXPORT.
2018-03-13 00:45:35 +00:00

178 lines
5.9 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef __GST_BUFFER_LIST_H__
#define __GST_BUFFER_LIST_H__
#include <gst/gstbuffer.h>
G_BEGIN_DECLS
GST_API GType _gst_buffer_list_type;
#define GST_TYPE_BUFFER_LIST (_gst_buffer_list_type)
#define GST_IS_BUFFER_LIST(obj) (GST_IS_MINI_OBJECT_TYPE(obj, GST_TYPE_BUFFER_LIST))
#define GST_BUFFER_LIST_CAST(obj) ((GstBufferList *)obj)
#define GST_BUFFER_LIST(obj) (GST_BUFFER_LIST_CAST(obj))
typedef struct _GstBufferList GstBufferList;
/**
* GstBufferListFunc:
* @buffer: (out) (nullable): pointer the buffer
* @idx: the index 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.
*
* When this function returns %TRUE, the next buffer will be
* returned. When %FALSE 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: %FALSE when gst_buffer_list_foreach() should stop
*/
typedef gboolean (*GstBufferListFunc) (GstBuffer **buffer, guint idx,
gpointer user_data);
/* refcounting */
/**
* gst_buffer_list_ref:
* @list: a #GstBufferList
*
* Increases the refcount of the given buffer list by one.
*
* Note that the refcount affects the writability 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
*/
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.
*/
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.
*/
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.
*/
#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
*/
#define gst_buffer_list_make_writable(list) GST_BUFFER_LIST_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (list)))
GST_API
GType gst_buffer_list_get_type (void);
/* allocation */
GST_API
GstBufferList * gst_buffer_list_new (void) G_GNUC_MALLOC;
GST_API
GstBufferList * gst_buffer_list_new_sized (guint size) G_GNUC_MALLOC;
GST_API
guint gst_buffer_list_length (GstBufferList *list);
GST_API
GstBuffer * gst_buffer_list_get (GstBufferList *list, guint idx);
GST_API
GstBuffer * gst_buffer_list_get_writable (GstBufferList *list, guint idx);
GST_API
void gst_buffer_list_insert (GstBufferList *list, gint idx, GstBuffer *buffer);
GST_API
void gst_buffer_list_remove (GstBufferList *list, guint idx, guint length);
GST_API
gboolean gst_buffer_list_foreach (GstBufferList *list,
GstBufferListFunc func,
gpointer user_data);
GST_API
GstBufferList * gst_buffer_list_copy_deep (const GstBufferList * list);
GST_API
gsize gst_buffer_list_calculate_size (GstBufferList * list);
#define gst_buffer_list_add(l,b) gst_buffer_list_insert((l),-1,(b));
#ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstBufferList, gst_buffer_list_unref)
#endif
G_END_DECLS
#endif /* __GST_BUFFER_LIST_H__ */