2 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
4 * gstlevel.c: signals RMS, peak and decaying peak levels
5 * Copyright (C) 2000,2001,2002,2003
6 * Thomas Vander Stichele <thomas at apestaart dot org>
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.
25 #ifndef __GST_LEVEL_H__
26 #define __GST_LEVEL_H__
31 #include "gstlevel-marshal.h"
36 #endif /* __cplusplus */
39 #define GST_TYPE_LEVEL \
40 (gst_level_get_type())
41 #define GST_LEVEL(obj) \
42 (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_LEVEL,GstLevel))
43 #define GST_LEVEL_CLASS(klass) \
44 (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ULAW,GstLevel))
45 #define GST_IS_LEVEL(obj) \
46 (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_LEVEL))
47 #define GST_IS_LEVEL_CLASS(obj) \
48 (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_LEVEL))
50 typedef struct _GstLevel GstLevel;
51 typedef struct _GstLevelClass GstLevelClass;
57 GstPad *sinkpad, *srcpad;
58 gboolean signal; /* whether or not to emit signals */
59 gboolean inited; /* whether or not the element is initialized */
60 gdouble interval; /* how many seconds between emits */
62 gint rate; /* caps variables */
66 gdouble decay_peak_ttl; /* time to live for peak in seconds */
67 gdouble decay_peak_falloff; /* falloff in dB/sec */
68 gdouble num_samples; /* cumulative sample count */
70 /* per-channel arrays for intermediate values */
71 gdouble *CS; /* normalized Cumulative Square */
72 gdouble *peak; /* normalized Peak value over buffer */
73 gdouble *last_peak; /* last normalized Peak value over interval */
74 gdouble *decay_peak; /* running decaying normalized Peak */
75 gdouble *MS; /* normalized Mean Square of buffer */
76 gdouble *RMS_dB; /* RMS in dB to emit */
77 gdouble *decay_peak_age; /* age of last peak */
82 GstElementClass parent_class;
83 void (*level) (GstElement * element, gdouble time, gint channel,
84 gdouble RMS_dB, gdouble peak_dB, gdouble decay_peak_dB);
87 GType gst_level_get_type (void);
91 #endif /* __cplusplus */
94 #endif /* __GST_STEREO_H__ */