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GStreamer 1.0 Core Reference Manual | ![]() |
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Top | Description |
#include <gst/gst.h> GstBufferList; GstBufferList * gst_buffer_list_new (void
); GstBufferList * gst_buffer_list_new_sized (guint size
); guint gst_buffer_list_length (GstBufferList *list
); #define gst_buffer_list_add (l, b) void gst_buffer_list_insert (GstBufferList *list
,gint idx
,GstBuffer *buffer
); void gst_buffer_list_remove (GstBufferList *list
,guint idx
,guint length
); GstBufferList * gst_buffer_list_ref (GstBufferList *list
); void gst_buffer_list_unref (GstBufferList *list
); GstBufferList * gst_buffer_list_copy (const GstBufferList *list
); #define gst_buffer_list_is_writable (list) #define gst_buffer_list_make_writable (list) gboolean (*GstBufferListFunc) (GstBuffer **buffer
,guint idx
,gpointer user_data
); gboolean gst_buffer_list_foreach (GstBufferList *list
,GstBufferListFunc func
,gpointer user_data
); GstBuffer * gst_buffer_list_get (GstBufferList *list
,guint idx
);
Buffer lists are an object containing a list of buffers.
Buffer lists are created with gst_buffer_list_new()
and filled with data
using a gst_buffer_list_insert()
.
Buffer lists can be pushed on a srcpad with gst_pad_push_list()
. This is
interesting when multiple buffers need to be pushed in one go because it
can reduce the amount of overhead for pushing each buffer individually.
Last reviewed on 2012-03-28 (0.11.3)
GstBufferList * gst_buffer_list_new (void
);
Creates a new, empty GstBufferList. The caller is responsible for unreffing the returned GstBufferList.
Free-function: gst_buffer_list_unref
Returns : |
the new GstBufferList. gst_buffer_list_unref()
after usage. [transfer full]
|
GstBufferList * gst_buffer_list_new_sized (guint size
);
Creates a new, empty GstBufferList. The caller is responsible for unreffing
the returned GstBufferList. The list will have size
space preallocated so
that memory reallocations can be avoided.
Free-function: gst_buffer_list_unref
|
an initial reserved size |
Returns : |
the new GstBufferList. gst_buffer_list_unref()
after usage. [transfer full]
|
guint gst_buffer_list_length (GstBufferList *list
);
Returns the number of buffers in list
.
|
a GstBufferList |
Returns : |
the number of buffers in the buffer list |
#define gst_buffer_list_add(l,b) gst_buffer_list_insert((l),-1,(b));
Append b
at the end of l
.
|
a GstBufferList |
|
a GstBuffer |
void gst_buffer_list_insert (GstBufferList *list
,gint idx
,GstBuffer *buffer
);
Insert buffer
at idx
in list
. Other buffers are moved to make room for
this new buffer.
A -1 value for idx
will append the buffer at the end.
|
a GstBufferList |
|
the index |
|
a GstBuffer. [transfer full] |
void gst_buffer_list_remove (GstBufferList *list
,guint idx
,guint length
);
Remove length
buffers starting from idx
in list
. The following buffers are
moved to close the gap.
|
a GstBufferList |
|
the index |
|
the amount to remove |
GstBufferList * gst_buffer_list_ref (GstBufferList *list
);
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.
|
a GstBufferList |
Returns : |
list . [transfer full]
|
void gst_buffer_list_unref (GstBufferList *list
);
Decreases the refcount of the buffer list. If the refcount reaches 0, the buffer list will be freed.
|
a GstBufferList. [transfer full] |
GstBufferList * gst_buffer_list_copy (const GstBufferList *list
);
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.
|
a GstBufferList |
Returns : |
a new copy of list . [transfer full]
|
#define gst_buffer_list_is_writable(list) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (list))
Tests if you can safely add buffers and groups into a buffer list.
|
a GstBufferList |
#define gst_buffer_list_make_writable(list) GST_BUFFER_LIST_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (list)))
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()
.
|
a GstBufferList. [transfer full] |
Returns : |
a writable list, which may or may not be the
same as list . [transfer full]
|
gboolean (*GstBufferListFunc) (GstBuffer **buffer
,guint idx
,gpointer user_data
);
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.
|
pointer the buffer |
|
the index of buffer
|
|
user data passed to gst_buffer_list_foreach()
|
Returns : |
FALSE when gst_buffer_list_foreach() should stop |
gboolean gst_buffer_list_foreach (GstBufferList *list
,GstBufferListFunc func
,gpointer user_data
);
Call func
with data
for each buffer in list
.
func
can modify the passed buffer pointer or its contents. The return value
of func
define if this function returns or if the remaining buffers in
the list should be skipped.
|
a GstBufferList |
|
a GstBufferListFunc to call. [scope call] |
|
user data passed to func . [closure]
|
Returns : |
TRUE when func returned TRUE for each buffer in list or when
list is empty. |
GstBuffer * gst_buffer_list_get (GstBufferList *list
,guint idx
);
Get the buffer at idx
.
|
a GstBufferList |
|
the index |
Returns : |
the buffer at idx in group or NULL when there
is no buffer. The buffer remains valid as long as list is valid. [transfer none]
|