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1681a1b1e0
This function works just like gst_data_queue_pop, but it doesn't remove the object from the queue. Useful when inspecting multiple GstDataQueues to decide from which to pop the element from. Add: gst_data_queue_peek
162 lines
5 KiB
C
162 lines
5 KiB
C
/* GStreamer
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* Copyright (C) 2006 Edward Hervey <edward@fluendo.com>
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*
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* gstdataqueue.h:
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_DATA_QUEUE_H__
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#define __GST_DATA_QUEUE_H__
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#include <gst/gst.h>
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G_BEGIN_DECLS
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#define GST_TYPE_DATA_QUEUE \
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(gst_data_queue_get_type())
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#define GST_DATA_QUEUE(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_DATA_QUEUE,GstDataQueue))
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#define GST_DATA_QUEUE_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_DATA_QUEUE,GstDataQueueClass))
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#define GST_IS_DATA_QUEUE(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_DATA_QUEUE))
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#define GST_IS_DATA_QUEUE_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_DATA_QUEUE))
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typedef struct _GstDataQueue GstDataQueue;
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typedef struct _GstDataQueueClass GstDataQueueClass;
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typedef struct _GstDataQueueSize GstDataQueueSize;
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typedef struct _GstDataQueueItem GstDataQueueItem;
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typedef struct _GstDataQueuePrivate GstDataQueuePrivate;
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/**
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* GstDataQueueItem:
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* @object: the #GstMiniObject to queue.
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* @size: the size in bytes of the miniobject.
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* @duration: the duration in #GstClockTime of the miniobject. Can not be
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* #GST_CLOCK_TIME_NONE.
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* @visible: #TRUE if @object should be considered as a visible object.
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* @destroy: The #GDestroyNotify function to use to free the #GstDataQueueItem.
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* This function should also drop the reference to @object the owner of the
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* #GstDataQueueItem is assumed to hold.
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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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*/
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struct _GstDataQueueItem
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{
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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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/* < private > */
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gpointer _gst_reserved[GST_PADDING];
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};
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/**
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* GstDataQueueSize:
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* @visible: number of buffers
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* @bytes: number of bytes
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* @time: amount of time
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*
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* Structure describing the size of a queue.
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*/
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struct _GstDataQueueSize
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{
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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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/**
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* GstDataQueueCheckFullFunction:
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* @queue: a #GstDataQueue.
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* @visible: The number of visible items currently in the queue.
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* @bytes: The amount of bytes currently in the queue.
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* @time: The accumulated duration of the items currently in the queue.
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* @checkdata: The #gpointer registered when the #GstDataQueue was created.
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*
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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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*
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* Returns: #TRUE if the queue should be considered full.
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*/
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typedef gboolean (*GstDataQueueCheckFullFunction) (GstDataQueue * queue,
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guint visible, guint bytes, guint64 time, gpointer checkdata);
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typedef void (*GstDataQueueFullCallback) (GstDataQueue * queue, gpointer checkdata);
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typedef void (*GstDataQueueEmptyCallback) (GstDataQueue * queue, gpointer checkdata);
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/**
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* GstDataQueue:
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* @object: the parent structure
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*
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* Opaque #GstDataQueue structure.
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*/
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struct _GstDataQueue
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{
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GObject object;
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/*< private >*/
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GstDataQueuePrivate *priv;
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gpointer _gst_reserved[GST_PADDING];
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};
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struct _GstDataQueueClass
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{
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GObjectClass parent_class;
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/* signals */
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void (*empty) (GstDataQueue * queue);
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void (*full) (GstDataQueue * queue);
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gpointer _gst_reserved[GST_PADDING];
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};
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GType gst_data_queue_get_type (void);
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GstDataQueue * gst_data_queue_new (GstDataQueueCheckFullFunction checkfull,
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GstDataQueueFullCallback fullcallback,
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GstDataQueueEmptyCallback emptycallback,
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gpointer checkdata) G_GNUC_MALLOC;
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gboolean gst_data_queue_push (GstDataQueue * queue, GstDataQueueItem * item);
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gboolean gst_data_queue_pop (GstDataQueue * queue, GstDataQueueItem ** item);
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gboolean gst_data_queue_peek (GstDataQueue * queue, GstDataQueueItem ** item);
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void gst_data_queue_flush (GstDataQueue * queue);
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void gst_data_queue_set_flushing (GstDataQueue * queue, gboolean flushing);
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gboolean gst_data_queue_drop_head (GstDataQueue * queue, GType type);
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gboolean gst_data_queue_is_full (GstDataQueue * queue);
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gboolean gst_data_queue_is_empty (GstDataQueue * queue);
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void gst_data_queue_get_level (GstDataQueue * queue, GstDataQueueSize *level);
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void gst_data_queue_limits_changed (GstDataQueue * queue);
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G_END_DECLS
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#endif /* __GST_DATA_QUEUE_H__ */
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