2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wtay@chello.be>
4 * 2005 Wim Taymans <wim@fluendo.com>
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
24 #ifndef __GST_BASESRC_H__
25 #define __GST_BASESRC_H__
31 #define GST_TYPE_BASESRC (gst_basesrc_get_type())
32 #define GST_BASESRC(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BASESRC,GstBaseSrc))
33 #define GST_BASESRC_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_BASESRC,GstBaseSrcClass))
34 #define GST_BASESRC_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_BASESRC, GstBaseSrcClass))
35 #define GST_IS_BASESRC(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BASESRC))
36 #define GST_IS_BASESRC_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BASESRC))
39 GST_BASESRC_STARTED = GST_ELEMENT_FLAG_LAST,
41 GST_BASESRC_FLAG_LAST = GST_ELEMENT_FLAG_LAST + 2
44 /* base class for random access sources
46 * This class is mostly usefull for elements that do byte based
47 * access to a random access resource, like files.
49 * Seeking, flushing, scheduling and sync is all handled by this
52 typedef struct _GstBaseSrc GstBaseSrc;
53 typedef struct _GstBaseSrcClass GstBaseSrcClass;
55 #define GST_BASESRC_PAD(obj) (GST_BASESRC (obj)->srcpad)
57 #define GST_LIVE_GET_LOCK(elem) (GST_BASESRC(elem)->live_lock)
58 #define GST_LIVE_LOCK(elem) g_mutex_lock(GST_LIVE_GET_LOCK(elem))
59 #define GST_LIVE_TRYLOCK(elem) g_mutex_trylock(GST_LIVE_GET_LOCK(elem))
60 #define GST_LIVE_UNLOCK(elem) g_mutex_unlock(GST_LIVE_GET_LOCK(elem))
61 #define GST_LIVE_GET_COND(elem) (GST_BASESRC(elem)->live_cond)
62 #define GST_LIVE_WAIT(elem) g_cond_wait (GST_LIVE_GET_COND (elem), GST_LIVE_GET_LOCK (elem))
63 #define GST_LIVE_TIMED_WAIT(elem, timeval) g_cond_timed_wait (GST_LIVE_GET_COND (elem), GST_LIVE_GET_LOCK (elem),\
65 #define GST_LIVE_SIGNAL(elem) g_cond_signal (GST_LIVE_GET_COND (elem));
66 #define GST_LIVE_BROADCAST(elem) g_cond_broadcast (GST_LIVE_GET_COND (elem));
74 /* available to subclass implementations */
75 /* MT-protected (with LIVE_LOCK) */
79 gboolean live_running;
81 /* MT-protected (with LOCK) */
82 gint blocksize; /* size of buffers when operating push based */
83 gboolean has_loop; /* some scheduling properties */
84 gboolean has_getrange;
86 gboolean random_access;
88 GstClockID clock_id; /* for syncing */
89 GstClockTime end_time;
91 /* MT-protected (with STREAM_LOCK) */
92 gint64 segment_start; /* start and end positions for seeking */
94 gboolean segment_loop;
96 guint64 offset; /* current offset in the resource */
97 guint64 size; /* total size of the resource */
102 * @create: ask the subclass to create a buffer with offset and size
103 * @start: start processing
105 struct _GstBaseSrcClass {
106 GstElementClass parent_class;
109 /* virtual methods for subclasses */
111 /* get caps from subclass */
112 GstCaps* (*get_caps) (GstBaseSrc *src);
113 /* notify the subclass of new caps */
114 gboolean (*set_caps) (GstBaseSrc *src, GstCaps *caps);
116 /* start and stop processing, ideal for opening/closing the resource */
117 gboolean (*start) (GstBaseSrc *src);
118 gboolean (*stop) (GstBaseSrc *src);
120 /* given a buffer, return start and stop time when it should be pushed
121 * out. The base class will sync on the clock using these times. */
122 void (*get_times) (GstBaseSrc *src, GstBuffer *buffer,
123 GstClockTime *start, GstClockTime *end);
125 /* get the total size of the resource in bytes */
126 gboolean (*get_size) (GstBaseSrc *src, guint64 *size);
128 /* check if the resource is seekable */
129 gboolean (*is_seekable) (GstBaseSrc *src);
130 /* unlock any pending access to the resource. subclasses should unlock
131 * any function ASAP. */
132 gboolean (*unlock) (GstBaseSrc *src);
134 /* notify subclasses of an event */
135 gboolean (*event) (GstBaseSrc *src, GstEvent *event);
137 /* ask the subclass to create a buffer with offset and size */
138 GstFlowReturn (*create) (GstBaseSrc *src, guint64 offset, guint size,
142 GType gst_basesrc_get_type(void);
144 void gst_basesrc_set_live (GstBaseSrc *src, gboolean live);
145 gboolean gst_basesrc_is_live (GstBaseSrc *src);
149 #endif /* __GST_BASESRC_H__ */