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