2 * Copyright (C) 1999 Erik Walthinsen <omega@cse.ogi.edu>
3 * Copyright (C) 2000,2001,2002,2003,2005
4 * Thomas Vander Stichele <thomas at apestaart dot org>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, USA.
23 #ifndef __GST_LEVEL_H__
24 #define __GST_LEVEL_H__
28 #include <gst/base/gstbasetransform.h>
34 #define GST_TYPE_LEVEL \
35 (gst_level_get_type())
36 #define GST_LEVEL(obj) \
37 (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_LEVEL,GstLevel))
38 #define GST_LEVEL_CLASS(klass) \
39 (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ULAW,GstLevel))
40 #define GST_IS_LEVEL(obj) \
41 (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_LEVEL))
42 #define GST_IS_LEVEL_CLASS(obj) \
43 (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_LEVEL))
46 typedef struct _GstLevel GstLevel;
47 typedef struct _GstLevelClass GstLevelClass;
51 GstBaseTransform element;
53 gboolean message; /* whether or not to post messages */
54 gdouble interval; /* how many seconds between emits */
56 gint rate; /* caps variables */
60 gdouble decay_peak_ttl; /* time to live for peak in seconds */
61 gdouble decay_peak_falloff; /* falloff in dB/sec */
62 gint num_samples; /* one-channel sample count since last emit */
64 /* per-channel arrays for intermediate values */
65 gdouble *CS; /* normalized Cumulative Square */
66 gdouble *peak; /* normalized Peak value over buffer */
67 gdouble *last_peak; /* last normalized Peak value over interval */
68 gdouble *decay_peak; /* running decaying normalized Peak */
69 gdouble *MS; /* normalized Mean Square of buffer */
70 gdouble *RMS_dB; /* RMS in dB to emit */
71 gdouble *decay_peak_age; /* age of last peak in one-channel samples */
74 struct _GstLevelClass {
75 GstBaseTransformClass parent_class;
78 GType gst_level_get_type (void);
84 #endif /* __GST_LEVEL_H__ */