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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstqueue.h:
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __GST_QUEUE_H__
#define __GST_QUEUE_H__
#include <gst/gstelement.h>
G_BEGIN_DECLS
#define GST_TYPE_QUEUE \
(gst_queue_get_type())
#define GST_QUEUE(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_QUEUE,GstQueue))
#define GST_QUEUE_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_QUEUE,GstQueueClass))
#define GST_IS_QUEUE(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_QUEUE))
#define GST_IS_QUEUE_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_QUEUE))
enum {
GST_QUEUE_NO_LEAK = 0,
GST_QUEUE_LEAK_UPSTREAM = 1,
GST_QUEUE_LEAK_DOWNSTREAM = 2
};
typedef struct _GstQueue GstQueue;
typedef struct _GstQueueSize GstQueueSize;
typedef struct _GstQueueClass GstQueueClass;
struct _GstQueueSize {
guint buffers; /* no. of buffers */
guint bytes; /* no. of bytes */
guint64 time; /* amount of time */
};
struct _GstQueue {
GstElement element;
GstPad *sinkpad;
GstPad *srcpad;
/* flowreturn when srcpad is paused */
GstFlowReturn srcresult;
/* the queue of data we're keeping our grubby hands on */
GQueue *queue;
GstQueueSize
cur_level, /* currently in the queue */
max_size, /* max. amount of data allowed in the queue */
min_threshold; /* min. amount of data required to wake reader */
/* whether we leak data, and at which end */
gint leaky;
GMutex *qlock; /* lock for queue (vs object lock) */
GCond *item_add; /* signals buffers now available for reading */
GCond *item_del; /* signals space now available for writing */
gpointer _gst_reserved[GST_PADDING];
};
struct _GstQueueClass {
GstElementClass parent_class;
/* signals - 'running' is called from both sides
* which might make it sort of non-useful... */
void (*underrun) (GstQueue *queue);
void (*running) (GstQueue *queue);
void (*overrun) (GstQueue *queue);
gpointer _gst_reserved[GST_PADDING];
};
GType gst_queue_get_type (void);
G_END_DECLS
#endif /* __GST_QUEUE_H__ */
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