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90d64117c5
Original commit message from CVS: This is either a rewrite or a large bugfix to the queue element, whatever you prefer to call it. * upstream event forwarding now works. This should fix Julien's issues. * this queue allows setting a min. treshold size and a max. limit size in bytes, buffers and time before the queue allows the next element to pull data or the previous element to push data into it. This is very interesting for network-related buffering. Also includes signals et all for the end user application. * Events are no longer part of the queue's "size", they're essentially seen as "void data". they have no size or time associated with them anyway, so this shouldn't really sound weird.
111 lines
3.1 KiB
C
111 lines
3.1 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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*
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* gstqueue.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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_QUEUE_H__
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#define __GST_QUEUE_H__
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#include <gst/gstelement.h>
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G_BEGIN_DECLS
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#define GST_TYPE_QUEUE \
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(gst_queue_get_type())
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#define GST_QUEUE(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_QUEUE,GstQueue))
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#define GST_QUEUE_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_QUEUE,GstQueueClass))
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#define GST_IS_QUEUE(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_QUEUE))
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#define GST_IS_QUEUE_CLASS(obj) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_QUEUE))
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enum {
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GST_QUEUE_NO_LEAK = 0,
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GST_QUEUE_LEAK_UPSTREAM = 1,
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GST_QUEUE_LEAK_DOWNSTREAM = 2
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};
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typedef struct _GstQueue GstQueue;
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typedef struct _GstQueueClass GstQueueClass;
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struct _GstQueue {
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GstElement element;
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GstPad *sinkpad;
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GstPad *srcpad;
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/* the queue of data we're keeping our grubby hands on */
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GQueue *queue;
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struct {
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guint buffers; /* no. of buffers */
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guint bytes; /* no. of bytes */
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guint64 time; /* amount of time */
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} cur_level, /* currently in the queue */
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max_size, /* max. amount of data allowed in the queue */
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min_treshold; /* min. amount of data required to wake reader */
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/* whether we leak data, and at which end */
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gint leaky;
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/* number of nanoseconds until a blocked queue 'times out'
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* to receive data and returns a filler event. -1 = disable */
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guint64 block_timeout;
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/* it the queue should fail on possible deadlocks */
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gboolean may_deadlock;
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gboolean interrupt;
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gboolean flush;
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GMutex *qlock; /* lock for queue (vs object lock) */
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GCond *item_add; /* signals buffers now available for reading */
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GCond *item_del; /* signals space now available for writing */
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GCond *event_done; /* upstream event signaller */
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GTimeVal *timeval; /* the timeout for the queue locking */
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GQueue *events; /* upstream events get decoupled here */
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gpointer _gst_reserved[GST_PADDING];
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};
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struct _GstQueueClass {
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GstElementClass parent_class;
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/* signals - 'running' is called from both sides
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* which might make it sort of non-useful... */
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void (*underrun) (GstQueue *queue);
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void (*running) (GstQueue *queue);
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void (*overrun) (GstQueue *queue);
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gpointer _gst_reserved[GST_PADDING];
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};
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GType gst_queue_get_type (void);
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G_END_DECLS
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#endif /* __GST_QUEUE_H__ */
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