1 /*
2  * GStreamer
3  * Copyright (C) 2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
4  *
5  * This library is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Library General Public
7  * License as published by the Free Software Foundation; either
8  * version 2 of the License, or (at your option) any later version.
9  *
10  * This library is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * Library General Public License for more details.
14  *
15  * You should have received a copy of the GNU Library General Public
16  * License along with this library; if not, write to the
17  * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
18  * Boston, MA 02110-1301, USA.
19  */
20 
21 #ifndef __GST_AUDIO_ECHO_H__
22 #define __GST_AUDIO_ECHO_H__
23 
24 #include <gst/gst.h>
25 #include <gst/base/gstbasetransform.h>
26 #include <gst/audio/audio.h>
27 #include <gst/audio/gstaudiofilter.h>
28 
29 G_BEGIN_DECLS
30 
31 #define GST_TYPE_AUDIO_ECHO            (gst_audio_echo_get_type())
32 #define GST_AUDIO_ECHO(obj)            (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_ECHO,GstAudioEcho))
33 #define GST_IS_AUDIO_ECHO(obj)         (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_ECHO))
34 #define GST_AUDIO_ECHO_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST((klass) ,GST_TYPE_AUDIO_ECHO,GstAudioEchoClass))
35 #define GST_IS_AUDIO_ECHO_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass) ,GST_TYPE_AUDIO_ECHO))
36 #define GST_AUDIO_ECHO_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS((obj) ,GST_TYPE_AUDIO_ECHO,GstAudioEchoClass))
37 typedef struct _GstAudioEcho GstAudioEcho;
38 typedef struct _GstAudioEchoClass GstAudioEchoClass;
39 
40 typedef void (*GstAudioEchoProcessFunc) (GstAudioEcho *, guint8 *, guint);
41 
42 struct _GstAudioEcho
43 {
44   GstAudioFilter audiofilter;
45 
46   guint64 delay;
47   guint64 max_delay;
48   gfloat intensity;
49   gfloat feedback;
50   gboolean surdelay;
51   guint64 surround_mask;
52 
53   /* < private > */
54   GstAudioEchoProcessFunc process;
55   guint delay_frames;
56   guint8 *buffer;
57   guint buffer_pos;
58   guint buffer_size;
59   guint buffer_size_frames;
60 
61   GMutex lock;
62 };
63 
64 struct _GstAudioEchoClass
65 {
66   GstAudioFilterClass parent;
67 };
68 
69 GType gst_audio_echo_get_type (void);
70 
71 G_END_DECLS
72 
73 #endif /* __GST_AUDIO_ECHO_H__ */
74