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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/gst.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(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_QUEUE))
typedef struct _GstQueue GstQueue;
typedef struct _GstQueueSize GstQueueSize;
typedef enum _GstQueueLeaky GstQueueLeaky;
typedef struct _GstQueueClass GstQueueClass;
/**
* GstQueueLeaky:
* @GST_QUEUE_NO_LEAK: Not Leaky
* @GST_QUEUE_LEAK_UPSTREAM: Leaky on upstream (new buffers)
* @GST_QUEUE_LEAK_DOWNSTREAM: Leaky on downstream (old buffers)
*
* Buffer dropping scheme to avoid the queue to block when full.
*/
enum _GstQueueLeaky {
GST_QUEUE_NO_LEAK = 0,
GST_QUEUE_LEAK_UPSTREAM = 1,
GST_QUEUE_LEAK_DOWNSTREAM = 2
};
/*
* GstQueueSize:
* @buffers: number of buffers
* @bytes: number of bytes
* @time: amount of time
*
* Structure describing the size of a queue.
*/
struct _GstQueueSize {
guint buffers;
guint bytes;
guint64 time;
};
#define GST_QUEUE_CLEAR_LEVEL(l) G_STMT_START { \
l.buffers = 0; \
l.bytes = 0; \
l.time = 0; \
} G_STMT_END
/**
* GstQueue:
*
* Opaque #GstQueue structure.
*/
struct _GstQueue {
GstElement element;
/*< private >*/
GstPad *sinkpad;
GstPad *srcpad;
/* segments to keep track of timestamps */
GstSegment sink_segment;
GstSegment src_segment;
/* position of src/sink */
GstClockTime sinktime, srctime;
/* TRUE if either position needs to be recalculated */
gboolean sink_tainted, src_tainted;
/* flowreturn when srcpad is paused */
GstFlowReturn srcresult;
gboolean unexpected;
gboolean eos;
/* 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 */
orig_min_threshold; /* Original min.threshold, for reset in EOS */
/* whether we leak data, and at which end */
gint leaky;
GMutex *qlock; /* lock for queue (vs object lock) */
gboolean waiting_add;
GCond *item_add; /* signals buffers now available for reading */
gboolean waiting_del;
GCond *item_del; /* signals space now available for writing */
gboolean head_needs_discont, tail_needs_discont;
gboolean push_newsegment;
gboolean silent; /* don't emit signals */
/* whether the first new segment has been applied to src */
gboolean newseg_applied_to_src;
};
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);
void (*pushing) (GstQueue *queue);
};
GType gst_queue_get_type (void);
G_END_DECLS
#endif /* __GST_QUEUE_H__ */
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