1 /* GStreamer
2  * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3  *                    2000 Wim Taymans <wtay@chello.be>
4  *
5  * gstadder.h: Header for GstAdder element
6  *
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.
11  *
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.
16  *
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., 51 Franklin St, Fifth Floor,
20  * Boston, MA 02110-1301, USA.
21  */
22 
23 #ifndef __GST_ADDER_H__
24 #define __GST_ADDER_H__
25 
26 #include <gst/gst.h>
27 #include <gst/base/gstcollectpads.h>
28 #include <gst/audio/audio.h>
29 
30 G_BEGIN_DECLS
31 
32 #define GST_TYPE_ADDER            (gst_adder_get_type())
33 #define GST_ADDER(obj)            (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ADDER,GstAdder))
34 #define GST_IS_ADDER(obj)         (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ADDER))
35 #define GST_ADDER_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST((klass) ,GST_TYPE_ADDER,GstAdderClass))
36 #define GST_IS_ADDER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass) ,GST_TYPE_ADDER))
37 
38 typedef struct _GstAdder             GstAdder;
39 typedef struct _GstAdderClass        GstAdderClass;
40 
41 typedef struct _GstAdderPad GstAdderPad;
42 typedef struct _GstAdderPadClass GstAdderPadClass;
43 
44 /**
45  * GstAdder:
46  *
47  * The adder object structure.
48  */
49 struct _GstAdder {
50   GstElement      element;
51 
52   GstPad         *srcpad;
53   GstCollectPads *collect;
54   /* pad counter, used for creating unique request pads */
55   gint            padcount;
56 
57   /* the next are valid for both int and float */
58   GstAudioInfo    info;
59 
60   /* counters to keep track of timestamps */
61   gint64          offset;
62 
63   /* sink event handling */
64   GstSegment      segment;
65   volatile gboolean new_segment_pending;
66   volatile gboolean flush_stop_pending;
67 
68   /* current caps */
69   GstCaps *current_caps;
70 
71   /* target caps (set via property) */
72   GstCaps *filter_caps;
73 
74   /* Pending inline events */
75   GList *pending_events;
76 
77   gboolean send_stream_start;
78   gboolean send_caps;
79 };
80 
81 struct _GstAdderClass {
82   GstElementClass parent_class;
83 };
84 
85 GType    gst_adder_get_type (void);
86 
87 #define GST_TYPE_ADDER_PAD            (gst_adder_pad_get_type())
88 #define GST_ADDER_PAD(obj)            (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ADDER_PAD,GstAdderPad))
89 #define GST_IS_ADDER_PAD(obj)         (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ADDER_PAD))
90 #define GST_ADDER_PAD_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST((klass) ,GST_TYPE_ADDER_PAD,GstAdderPadClass))
91 #define GST_IS_ADDER_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass) ,GST_TYPE_ADDER_PAD))
92 #define GST_ADDER_PAD_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS((obj) ,GST_TYPE_ADDER_PAD,GstAdderPadClass))
93 
94 struct _GstAdderPad {
95   GstPad parent;
96 
97   gdouble volume;
98   gint volume_i32;
99   gint volume_i16;
100   gint volume_i8;
101   gboolean mute;
102 };
103 
104 struct _GstAdderPadClass {
105   GstPadClass parent_class;
106 };
107 
108 GType gst_adder_pad_get_type (void);
109 
110 G_END_DECLS
111 
112 
113 #endif /* __GST_ADDER_H__ */
114