2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wtay@chello.be>
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
24 #ifndef __GST_QUEUE_H__
25 #define __GST_QUEUE_H__
31 #define GST_TYPE_QUEUE \
32 (gst_queue_get_type())
33 #define GST_QUEUE(obj) \
34 (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_QUEUE,GstQueue))
35 #define GST_QUEUE_CLASS(klass) \
36 (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_QUEUE,GstQueueClass))
37 #define GST_IS_QUEUE(obj) \
38 (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_QUEUE))
39 #define GST_IS_QUEUE_CLASS(klass) \
40 (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_QUEUE))
42 typedef struct _GstQueue GstQueue;
43 typedef struct _GstQueueSize GstQueueSize;
44 typedef enum _GstQueueLeaky GstQueueLeaky;
45 typedef struct _GstQueueClass GstQueueClass;
49 * @GST_QUEUE_NO_LEAK: Not Leaky
50 * @GST_QUEUE_LEAK_UPSTREAM: Leaky on upstream (new buffers)
51 * @GST_QUEUE_LEAK_DOWNSTREAM: Leaky on downstream (old buffers)
53 * Buffer dropping scheme to avoid the queue to block when full.
56 GST_QUEUE_NO_LEAK = 0,
57 GST_QUEUE_LEAK_UPSTREAM = 1,
58 GST_QUEUE_LEAK_DOWNSTREAM = 2
63 * @buffers: number of buffers
64 * @bytes: number of bytes
65 * @time: amount of time
67 * Structure describing the size of a queue.
69 struct _GstQueueSize {
75 #define GST_QUEUE_CLEAR_LEVEL(l) G_STMT_START { \
84 * Opaque #GstQueue structure.
93 /* segments to keep track of timestamps */
94 GstSegment sink_segment;
95 GstSegment src_segment;
97 /* position of src/sink */
98 GstClockTime sinktime, srctime;
99 /* TRUE if either position needs to be recalculated */
100 gboolean sink_tainted, src_tainted;
102 /* flowreturn when srcpad is paused */
103 GstFlowReturn srcresult;
107 #ifdef GST_EXT_AV_RECORDING
108 /* to not enqueue the buffers */
109 gboolean empty_buffers;
112 /* the queue of data we're keeping our grubby hands on */
116 cur_level, /* currently in the queue */
117 max_size, /* max. amount of data allowed in the queue */
118 min_threshold, /* min. amount of data required to wake reader */
119 orig_min_threshold; /* Original min.threshold, for reset in EOS */
121 /* whether we leak data, and at which end */
124 GMutex *qlock; /* lock for queue (vs object lock) */
125 gboolean waiting_add;
126 GCond *item_add; /* signals buffers now available for reading */
127 gboolean waiting_del;
128 GCond *item_del; /* signals space now available for writing */
130 gboolean head_needs_discont, tail_needs_discont;
131 gboolean push_newsegment;
133 gboolean silent; /* don't emit signals */
135 /* whether the first new segment has been applied to src */
136 gboolean newseg_applied_to_src;
139 struct _GstQueueClass {
140 GstElementClass parent_class;
142 /* signals - 'running' is called from both sides
143 * which might make it sort of non-useful... */
144 void (*underrun) (GstQueue *queue);
145 void (*running) (GstQueue *queue);
146 void (*overrun) (GstQueue *queue);
148 void (*pushing) (GstQueue *queue);
151 GType gst_queue_get_type (void);
156 #endif /* __GST_QUEUE_H__ */