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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>GstDataQueue: GStreamer 1.0 Library Reference Manual</title>
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<link rel="home" href="index.html" title="GStreamer 1.0 Library Reference Manual">
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<link rel="up" href="gstreamer-base.html" title="GStreamer Base and Utillity Classes">
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<link rel="prev" href="gstreamer-libs-GstTypeFindHelper.html" title="GstTypeFindHelper">
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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Description
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GstDataQueue
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GstDataQueue — Threadsafe queueing object
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Functions
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gboolean
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(*GstDataQueueCheckFullFunction) ()
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void
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(*GstDataQueueEmptyCallback) ()
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void
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(*GstDataQueueFullCallback) ()
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GstDataQueue *
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gst_data_queue_new ()
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gboolean
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gst_data_queue_push ()
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gboolean
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gst_data_queue_push_force ()
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gboolean
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gst_data_queue_pop ()
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gboolean
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gst_data_queue_peek ()
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void
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gst_data_queue_flush ()
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void
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gst_data_queue_set_flushing ()
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gboolean
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gst_data_queue_drop_head ()
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gboolean
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gst_data_queue_is_full ()
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gboolean
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gst_data_queue_is_empty ()
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void
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gst_data_queue_get_level ()
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void
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gst_data_queue_limits_changed ()
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Types and Values
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struct
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GstDataQueue
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struct
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GstDataQueueSize
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struct
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GstDataQueueItem
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Includes
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#include <gst/base/gstdataqueue.h>
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Description
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GstDataQueue is an object that handles threadsafe queueing of objects. It
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also provides size-related functionality. This object should be used for
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any GstElement that wishes to provide some sort of queueing functionality.
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Functions
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GstDataQueueCheckFullFunction ()
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gboolean
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(*GstDataQueueCheckFullFunction) (GstDataQueue *queue,
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guint visible,
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guint bytes,
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guint64 time,
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gpointer checkdata);
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The prototype of the function used to inform the queue that it should be
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considered as full.
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Parameters
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queue
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a GstDataQueue.
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visible
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The number of visible items currently in the queue.
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bytes
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The amount of bytes currently in the queue.
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time
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The accumulated duration of the items currently in the queue.
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checkdata
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The gpointer registered when the GstDataQueue was created.
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Returns
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TRUE if the queue should be considered full.
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GstDataQueueEmptyCallback ()
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void
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(*GstDataQueueEmptyCallback) (GstDataQueue *queue,
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gpointer checkdata);
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GstDataQueueFullCallback ()
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void
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(*GstDataQueueFullCallback) (GstDataQueue *queue,
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gpointer checkdata);
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gst_data_queue_new ()
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GstDataQueue *
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gst_data_queue_new (GstDataQueueCheckFullFunction checkfull,
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GstDataQueueFullCallback fullcallback,
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GstDataQueueEmptyCallback emptycallback,
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gpointer checkdata);
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Creates a new GstDataQueue. If fullcallback
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or emptycallback
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are supplied, then
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the GstDataQueue will call the respective callback to signal full or empty condition.
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If the callbacks are NULL the GstDataQueue will instead emit 'full' and 'empty'
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signals.
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Parameters
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checkfull
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the callback used to tell if the element considers the queue full
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or not.
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fullcallback
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the callback which will be called when the queue is considered full.
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emptycallback
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the callback which will be called when the queue is considered empty.
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checkdata
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a gpointer that will be passed to the checkfull
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, fullcallback
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,
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and emptycallback
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callbacks.
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Returns
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a new GstDataQueue.
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Since: 1.2
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gst_data_queue_push ()
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gboolean
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gst_data_queue_push (GstDataQueue *queue,
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GstDataQueueItem *item);
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Pushes a GstDataQueueItem (or a structure that begins with the same fields)
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on the queue
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. If the queue
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is full, the call will block until space is
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available, OR the queue
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is set to flushing state.
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MT safe.
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Note that this function has slightly different semantics than gst_pad_push()
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and gst_pad_push_event(): this function only takes ownership of item
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and
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the GstMiniObject contained in item
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if the push was successful. If FALSE
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is returned, the caller is responsible for freeing item
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and its contents.
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[skip]
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Parameters
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queue
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a GstDataQueue.
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item
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a GstDataQueueItem.
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Returns
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TRUE if the item
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was successfully pushed on the queue
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.
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Since: 1.2
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|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_data_queue_push_force ()
|
|
Packit |
f546b1 |
gboolean
|
|
Packit |
f546b1 |
gst_data_queue_push_force (GstDataQueue *queue,
|
|
Packit |
f546b1 |
GstDataQueueItem *item);
|
|
Packit |
f546b1 |
Pushes a GstDataQueueItem (or a structure that begins with the same fields)
|
|
Packit |
f546b1 |
on the queue
|
|
Packit |
f546b1 |
. It ignores if the queue
|
|
Packit |
f546b1 |
is full or not and forces the item
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
to be pushed anyway.
|
|
Packit |
f546b1 |
MT safe.
|
|
Packit |
f546b1 |
Note that this function has slightly different semantics than gst_pad_push()
|
|
Packit |
f546b1 |
and gst_pad_push_event(): this function only takes ownership of item
|
|
Packit |
f546b1 |
and
|
|
Packit |
f546b1 |
the GstMiniObject contained in item
|
|
Packit |
f546b1 |
if the push was successful. If FALSE
|
|
Packit |
f546b1 |
is returned, the caller is responsible for freeing item
|
|
Packit |
f546b1 |
and its contents.
|
|
Packit |
f546b1 |
[skip]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
queue
|
|
Packit |
f546b1 |
a GstDataQueue.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
item
|
|
Packit |
f546b1 |
a GstDataQueueItem.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Returns
|
|
Packit |
f546b1 |
TRUE if the item
|
|
Packit |
f546b1 |
was successfully pushed on the queue
|
|
Packit |
f546b1 |
.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Since: 1.2
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_data_queue_pop ()
|
|
Packit |
f546b1 |
gboolean
|
|
Packit |
f546b1 |
gst_data_queue_pop (GstDataQueue *queue,
|
|
Packit |
f546b1 |
GstDataQueueItem **item);
|
|
Packit |
f546b1 |
Retrieves the first item
|
|
Packit |
f546b1 |
available on the queue
|
|
Packit |
f546b1 |
. If the queue is currently
|
|
Packit |
f546b1 |
empty, the call will block until at least one item is available, OR the
|
|
Packit |
f546b1 |
queue
|
|
Packit |
f546b1 |
is set to the flushing state.
|
|
Packit |
f546b1 |
MT safe.
|
|
Packit |
f546b1 |
[skip]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
queue
|
|
Packit |
f546b1 |
a GstDataQueue.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
item
|
|
Packit |
f546b1 |
pointer to store the returned GstDataQueueItem.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Returns
|
|
Packit |
f546b1 |
TRUE if an item
|
|
Packit |
f546b1 |
was successfully retrieved from the queue
|
|
Packit |
f546b1 |
.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Since: 1.2
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_data_queue_peek ()
|
|
Packit |
f546b1 |
gboolean
|
|
Packit |
f546b1 |
gst_data_queue_peek (GstDataQueue *queue,
|
|
Packit |
f546b1 |
GstDataQueueItem **item);
|
|
Packit |
f546b1 |
Retrieves the first item
|
|
Packit |
f546b1 |
available on the queue
|
|
Packit |
f546b1 |
without removing it.
|
|
Packit |
f546b1 |
If the queue is currently empty, the call will block until at least
|
|
Packit |
f546b1 |
one item is available, OR the queue
|
|
Packit |
f546b1 |
is set to the flushing state.
|
|
Packit |
f546b1 |
MT safe.
|
|
Packit |
f546b1 |
[skip]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
queue
|
|
Packit |
f546b1 |
a GstDataQueue.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
item
|
|
Packit |
f546b1 |
pointer to store the returned GstDataQueueItem.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Returns
|
|
Packit |
f546b1 |
TRUE if an item
|
|
Packit |
f546b1 |
was successfully retrieved from the queue
|
|
Packit |
f546b1 |
.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Since: 1.2
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_data_queue_flush ()
|
|
Packit |
f546b1 |
void
|
|
Packit |
f546b1 |
gst_data_queue_flush (GstDataQueue *queue);
|
|
Packit |
f546b1 |
Flushes all the contents of the queue
|
|
Packit |
f546b1 |
. Any call to gst_data_queue_push and
|
|
Packit |
f546b1 |
gst_data_queue_pop will be released.
|
|
Packit |
f546b1 |
MT safe.
|
|
Packit |
f546b1 |
[skip]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
queue
|
|
Packit |
f546b1 |
a GstDataQueue.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Since: 1.2
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_data_queue_set_flushing ()
|
|
Packit |
f546b1 |
void
|
|
Packit |
f546b1 |
gst_data_queue_set_flushing (GstDataQueue *queue,
|
|
Packit |
f546b1 |
gboolean flushing);
|
|
Packit |
f546b1 |
Sets the queue to flushing state if flushing
|
|
Packit |
f546b1 |
is TRUE. If set to flushing
|
|
Packit |
f546b1 |
state, any incoming data on the queue
|
|
Packit |
f546b1 |
will be discarded. Any call currently
|
|
Packit |
f546b1 |
blocking on gst_data_queue_push or gst_data_queue_pop will return straight
|
|
Packit |
f546b1 |
away with a return value of FALSE. While the queue
|
|
Packit |
f546b1 |
is in flushing state,
|
|
Packit |
f546b1 |
all calls to those two functions will return FALSE.
|
|
Packit |
f546b1 |
MT Safe.
|
|
Packit |
f546b1 |
[skip]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
queue
|
|
Packit |
f546b1 |
a GstDataQueue.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
flushing
|
|
Packit |
f546b1 |
a gboolean stating if the queue will be flushing or not.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Since: 1.2
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_data_queue_drop_head ()
|
|
Packit |
f546b1 |
gboolean
|
|
Packit |
f546b1 |
gst_data_queue_drop_head (GstDataQueue *queue,
|
|
Packit |
f546b1 |
GType type);
|
|
Packit |
f546b1 |
Pop and unref the head-most GstMiniObject with the given GType.
|
|
Packit |
f546b1 |
[skip]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
queue
|
|
Packit |
f546b1 |
The GstDataQueue to drop an item from.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
type
|
|
Packit |
f546b1 |
The GType of the item to drop.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Returns
|
|
Packit |
f546b1 |
TRUE if an element was removed.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Since: 1.2
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_data_queue_is_full ()
|
|
Packit |
f546b1 |
gboolean
|
|
Packit |
f546b1 |
gst_data_queue_is_full (GstDataQueue *queue);
|
|
Packit |
f546b1 |
Queries if queue
|
|
Packit |
f546b1 |
is full. This check will be done using the
|
|
Packit |
f546b1 |
GstDataQueueCheckFullFunction registered with queue
|
|
Packit |
f546b1 |
.
|
|
Packit |
f546b1 |
MT safe.
|
|
Packit |
f546b1 |
[skip]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
queue
|
|
Packit |
f546b1 |
a GstDataQueue.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Returns
|
|
Packit |
f546b1 |
TRUE if queue
|
|
Packit |
f546b1 |
is full.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Since: 1.2
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_data_queue_is_empty ()
|
|
Packit |
f546b1 |
gboolean
|
|
Packit |
f546b1 |
gst_data_queue_is_empty (GstDataQueue *queue);
|
|
Packit |
f546b1 |
Queries if there are any items in the queue
|
|
Packit |
f546b1 |
.
|
|
Packit |
f546b1 |
MT safe.
|
|
Packit |
f546b1 |
[skip]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
queue
|
|
Packit |
f546b1 |
a GstDataQueue.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Returns
|
|
Packit |
f546b1 |
TRUE if queue
|
|
Packit |
f546b1 |
is empty.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Since: 1.2
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_data_queue_get_level ()
|
|
Packit |
f546b1 |
void
|
|
Packit |
f546b1 |
gst_data_queue_get_level (GstDataQueue *queue,
|
|
Packit |
f546b1 |
GstDataQueueSize *level);
|
|
Packit |
f546b1 |
Get the current level of the queue.
|
|
Packit |
f546b1 |
[skip]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
queue
|
|
Packit |
f546b1 |
The GstDataQueue
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
level
|
|
Packit |
f546b1 |
the location to store the result
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Since: 1.2
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_data_queue_limits_changed ()
|
|
Packit |
f546b1 |
void
|
|
Packit |
f546b1 |
gst_data_queue_limits_changed (GstDataQueue *queue);
|
|
Packit |
f546b1 |
Inform the queue that the limits for the fullness check have changed and that
|
|
Packit |
f546b1 |
any blocking gst_data_queue_push() should be unblocked to recheck the limits.
|
|
Packit |
f546b1 |
[skip]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
queue
|
|
Packit |
f546b1 |
The GstDataQueue
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Since: 1.2
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Types and Values
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
struct GstDataQueue
|
|
Packit |
f546b1 |
struct GstDataQueue {
|
|
Packit |
f546b1 |
GObject object;
|
|
Packit |
f546b1 |
};
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Opaque GstDataQueue structure.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Members
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GObject object;
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the parent structure
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struct GstDataQueueSize
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struct GstDataQueueSize {
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guint visible;
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guint bytes;
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guint64 time;
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};
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Structure describing the size of a queue.
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Members
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guint visible;
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number of buffers
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guint bytes;
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number of bytes
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guint64 time;
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amount of time
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struct GstDataQueueItem
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struct GstDataQueueItem {
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GstMiniObject *object;
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guint size;
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guint64 duration;
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gboolean visible;
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/* user supplied destroy function */
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GDestroyNotify destroy;
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};
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Structure used by GstDataQueue. You can supply a different structure, as
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long as the top of the structure is identical to this structure.
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Members
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GstMiniObject *object;
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the GstMiniObject to queue.
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guint size;
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the size in bytes of the miniobject.
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guint64 duration;
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the duration in GstClockTime of the miniobject. Can not be
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GST_CLOCK_TIME_NONE.
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gboolean visible;
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TRUE if object
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should be considered as a visible object.
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GDestroyNotify destroy;
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The GDestroyNotify function to use to free the GstDataQueueItem.
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This function should also drop the reference to object
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the owner of the
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GstDataQueueItem is assumed to hold.
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Generated by GTK-Doc V1.27
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