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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
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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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, 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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#define GST_TYPE_BUFFER_LIST (gst_buffer_list_get_type ())
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#define GST_IS_BUFFER_LIST(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_BUFFER_LIST))
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#define GST_IS_BUFFER_LIST_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_BUFFER_LIST))
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#define GST_BUFFER_LIST_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_BUFFER_LIST, GstBufferListClass))
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#define GST_BUFFER_LIST(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_BUFFER_LIST, GstBufferList))
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#define GST_BUFFER_LIST_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_BUFFER_LIST, GstBufferListClass))
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#define GST_BUFFER_LIST_CAST(obj) ((GstBufferList *)obj)
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#define GST_TYPE_BUFFER_LIST_ITERATOR (gst_buffer_list_iterator_get_type ())
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typedef struct _GstBufferList GstBufferList;
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typedef struct _GstBufferListClass GstBufferListClass;
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typedef struct _GstBufferListIterator GstBufferListIterator;
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/**
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* GstBufferListDoFunction:
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* @buffer: (transfer full): the #GstBuffer
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* @user_data: user data
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*
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* A function for accessing the last buffer returned by
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* gst_buffer_list_iterator_next(). The function can leave @buffer in the list,
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* replace @buffer in the list or remove @buffer from the list, depending on
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* the return value. If the function returns NULL, @buffer will be removed from
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* the list, otherwise @buffer will be replaced with the returned buffer.
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*
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* The last buffer returned by gst_buffer_list_iterator_next() will be replaced
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* with the buffer returned from the function. The function takes ownership of
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* @buffer and if a different value than @buffer is returned, @buffer must be
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* unreffed. If NULL is returned, the buffer will be removed from the list. The
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* list must be writable.
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*
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* Returns: (transfer full): the buffer to replace @buffer in the list, or NULL
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* to remove @buffer from the list
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*
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* Since: 0.10.24
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*/
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typedef GstBuffer* (*GstBufferListDoFunction) (GstBuffer * buffer, gpointer user_data);
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/**
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* GstBufferListItem:
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* @GST_BUFFER_LIST_CONTINUE: Retrieve next buffer
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* @GST_BUFFER_LIST_SKIP_GROUP: Skip to next group
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* @GST_BUFFER_LIST_END: End iteration
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*
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* The result of the #GstBufferListFunc.
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*
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* Since: 0.10.24
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*/
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typedef enum {
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GST_BUFFER_LIST_CONTINUE,
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GST_BUFFER_LIST_SKIP_GROUP,
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GST_BUFFER_LIST_END
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} GstBufferListItem;
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/**
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* GstBufferListFunc:
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* @buffer: pointer the buffer
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* @group: the group index of @buffer
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* @idx: the index in @group 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 in @group.
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*
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* When this function returns #GST_BUFFER_LIST_CONTINUE, the next buffer will be
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* returned. When #GST_BUFFER_LIST_SKIP_GROUP is returned, all remaining buffers
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* in the current group will be skipped and the first buffer of the next group
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* is returned (if any). When GST_BUFFER_LIST_END is returned,
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* 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: a #GstBufferListItem
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*
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* Since: 0.10.24
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*/
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typedef GstBufferListItem (*GstBufferListFunc) (GstBuffer **buffer, guint group, guint idx,
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gpointer user_data);
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GType gst_buffer_list_get_type (void);
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/* allocation */
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GstBufferList *gst_buffer_list_new (void);
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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 writeability 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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* Since: 0.10.24
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*/
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#ifdef _FOOL_GTK_DOC_
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G_INLINE_FUNC GstBufferList * gst_buffer_list_ref (GstBufferList * list);
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#endif
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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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* Since: 0.10.24
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*/
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#ifdef _FOOL_GTK_DOC_
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G_INLINE_FUNC void gst_buffer_list_unref (GstBufferList * list);
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#endif
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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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/* 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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* Since: 0.10.24
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*/
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#ifdef _FOOL_GTK_DOC_
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G_INLINE_FUNC GstBufferList * gst_buffer_list_copy (const GstBufferList * list);
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#endif
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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_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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* Since: 0.10.24
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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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* Since: 0.10.24
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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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guint gst_buffer_list_n_groups (GstBufferList *list);
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void gst_buffer_list_foreach (GstBufferList *list,
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GstBufferListFunc func,
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gpointer user_data);
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GstBuffer * gst_buffer_list_get (GstBufferList *list, guint group, guint idx);
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/* iterator */
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GType gst_buffer_list_iterator_get_type (void);
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GstBufferListIterator * gst_buffer_list_iterate (GstBufferList *list) G_GNUC_MALLOC;
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void gst_buffer_list_iterator_free (GstBufferListIterator *it);
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guint gst_buffer_list_iterator_n_buffers (const GstBufferListIterator *it);
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GstBuffer * gst_buffer_list_iterator_next (GstBufferListIterator *it);
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gboolean gst_buffer_list_iterator_next_group (GstBufferListIterator *it);
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void gst_buffer_list_iterator_add (GstBufferListIterator *it, GstBuffer *buffer);
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void gst_buffer_list_iterator_add_list (GstBufferListIterator *it, GList *list);
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void gst_buffer_list_iterator_add_group (GstBufferListIterator *it);
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void gst_buffer_list_iterator_remove (GstBufferListIterator *it);
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GstBuffer * gst_buffer_list_iterator_steal (GstBufferListIterator *it);
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void gst_buffer_list_iterator_take (GstBufferListIterator *it, GstBuffer *buffer);
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GstBuffer * gst_buffer_list_iterator_do (GstBufferListIterator *it, GstBufferListDoFunction do_func,
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gpointer user_data);
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/* conversion */
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GstBuffer * gst_buffer_list_iterator_merge_group (const GstBufferListIterator *it);
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G_END_DECLS
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#endif /* __GST_BUFFER_LIST_H__ */
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