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3ab75a571e
Original commit message from CVS: added second example with plotting fixed some aesthetics
91 lines
2.8 KiB
C
91 lines
2.8 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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*
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* gstlevel.c: signals RMS, peak and decaying peak levels
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* Copyright (C) 2000,2001,2002,2003
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* Thomas Vander Stichele <thomas at apestaart dot org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_LEVEL_H__
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#define __GST_LEVEL_H__
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#include <config.h>
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#include <gst/gst.h>
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#include "gstlevel-marshal.h"
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#define GST_TYPE_LEVEL \
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(gst_level_get_type())
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#define GST_LEVEL(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_LEVEL,GstLevel))
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#define GST_LEVEL_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ULAW,GstLevel))
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#define GST_IS_LEVEL(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_LEVEL))
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#define GST_IS_LEVEL_CLASS(obj) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_LEVEL))
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typedef struct _GstLevel GstLevel;
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typedef struct _GstLevelClass GstLevelClass;
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struct _GstLevel {
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GstElement element;
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GstPad *sinkpad, *srcpad;
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gboolean signal; /* whether or not to emit signals */
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gdouble interval; /* how many seconds between emits */
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gint rate; /* caps variables */
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gint width;
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gint channels;
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gdouble decay_peak_ttl; /* time to live for peak in seconds */
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gdouble decay_peak_falloff; /* falloff in dB/sec */
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gdouble num_samples; /* cumulative sample count */
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/* per-channel arrays for intermediate values */
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gdouble *CS; /* normalized Cumulative Square */
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gdouble *peak; /* normalized Peak value over buffer */
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gdouble *last_peak; /* last normalized Peak value over interval */
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gdouble *decay_peak; /* running decaying normalized Peak */
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gdouble *MS; /* normalized Mean Square of buffer */
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gdouble *RMS_dB; /* RMS in dB to emit */
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gdouble *decay_peak_age; /* age of last peak */
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};
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struct _GstLevelClass {
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GstElementClass parent_class;
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void (*level) (GstElement *element, gdouble time, gint channel,
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gdouble RMS_dB, gdouble peak_dB, gdouble decay_peak_dB);
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};
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GType gst_level_get_type(void);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __GST_STEREO_H__ */
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