1 /*
2  * GStreamer
3  * Copyright (C) 2008 Wim Taymans <wim.taymans@gmail.com>
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_KARAOKE_H__
22 #define __GST_AUDIO_KARAOKE_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 #define GST_TYPE_AUDIO_KARAOKE            (gst_audio_karaoke_get_type())
31 #define GST_AUDIO_KARAOKE(obj)            (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_KARAOKE,GstAudioKaraoke))
32 #define GST_IS_AUDIO_KARAOKE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_KARAOKE))
33 #define GST_AUDIO_KARAOKE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST((klass) ,GST_TYPE_AUDIO_KARAOKE,GstAudioKaraokeClass))
34 #define GST_IS_AUDIO_KARAOKE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass) ,GST_TYPE_AUDIO_KARAOKE))
35 #define GST_AUDIO_KARAOKE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS((obj) ,GST_TYPE_AUDIO_KARAOKE,GstAudioKaraokeClass))
36 typedef struct _GstAudioKaraoke GstAudioKaraoke;
37 typedef struct _GstAudioKaraokeClass GstAudioKaraokeClass;
38 
39 typedef void (*GstAudioKaraokeProcessFunc) (GstAudioKaraoke *, guint8 *, guint);
40 
41 struct _GstAudioKaraoke
42 {
43   GstAudioFilter audiofilter;
44 
45   /* properties */
46   gfloat level;
47   gfloat mono_level;
48   gfloat filter_band;
49   gfloat filter_width;
50 
51   /* filter coef */
52   gfloat A, B, C;
53   gfloat y1, y2;
54 
55   /* < private > */
56   GstAudioKaraokeProcessFunc process;
57 };
58 
59 struct _GstAudioKaraokeClass
60 {
61   GstAudioFilterClass parent;
62 };
63 
64 GType gst_audio_karaoke_get_type (void);
65 
66 G_END_DECLS
67 #endif /* __GST_AUDIO_KARAOKE_H__ */
68