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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* gstlevel.c: signals RMS, peak and decaying peak levels
* Copyright (C) 2000,2001,2002,2003
* Thomas Vander Stichele <thomas at apestaart dot org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __GST_LEVEL_H__
#define __GST_LEVEL_H__
#include <gst/gst.h>
#include <gst/base/gstbasetransform.h>
G_BEGIN_DECLS
#define GST_TYPE_LEVEL \
(gst_level_get_type())
#define GST_LEVEL(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_LEVEL,GstLevel))
#define GST_LEVEL_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ULAW,GstLevel))
#define GST_IS_LEVEL(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_LEVEL))
#define GST_IS_LEVEL_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_LEVEL))
typedef struct _GstLevel GstLevel;
typedef struct _GstLevelClass GstLevelClass;
struct _GstLevel {
GstBaseTransform element;
gboolean signal; /* whether or not to emit signals */
gdouble interval; /* how many seconds between emits */
gint rate; /* caps variables */
gint width;
gint channels;
gdouble decay_peak_ttl; /* time to live for peak in seconds */
gdouble decay_peak_falloff; /* falloff in dB/sec */
gdouble num_samples; /* one-channel sample count since last emit */
/* per-channel arrays for intermediate values */
gdouble *CS; /* normalized Cumulative Square */
gdouble *peak; /* normalized Peak value over buffer */
gdouble *last_peak; /* last normalized Peak value over interval */
gdouble *decay_peak; /* running decaying normalized Peak */
gdouble *MS; /* normalized Mean Square of buffer */
gdouble *RMS_dB; /* RMS in dB to emit */
gdouble *decay_peak_age; /* age of last peak in one-channel samples */
};
struct _GstLevelClass {
GstBaseTransformClass parent_class;
};
GType gst_level_get_type(void);
G_END_DECLS
#endif /* __GST_LEVEL_H__ */
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