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92 lines
3 KiB
C
92 lines
3 KiB
C
/* GStreamer
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* Copyright (C) 1999 Erik Walthinsen <omega@cse.ogi.edu>
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* Copyright (C) 2000,2001,2002,2003,2005
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, 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 <gst/gst.h>
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#include <gst/base/gstbasetransform.h>
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#include <gst/audio/audio.h>
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G_BEGIN_DECLS
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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_LEVEL,GstLevelClass))
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#define GST_LEVEL_GET_CLASS(obj) \
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(G_TYPE_INSTANCE_GET_CLASS((obj),GST_TYPE_LEVEL,GstLevelClass))
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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(klass) \
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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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/**
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* GstLevel:
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*
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* Opaque data structure.
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*/
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struct _GstLevel {
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GstBaseTransform element;
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/* properties */
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gboolean post_messages; /* whether or not to post messages */
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guint64 interval; /* how many nanoseconds between emits */
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gdouble decay_peak_ttl; /* time to live for peak in nanoseconds */
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gdouble decay_peak_falloff; /* falloff in dB/sec */
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GstAudioInfo info;
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gint num_frames; /* frame count (1 sample per channel)
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* since last emit */
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gint interval_frames; /* after how many frame to sent a message */
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GstClockTime message_ts; /* starttime for next message */
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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 *decay_peak_base; /* value of last peak we are decaying from */
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GstClockTime *decay_peak_age; /* age of last peak */
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void (*process)(gpointer, guint, guint, gdouble*, gdouble*);
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};
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struct _GstLevelClass {
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GstBaseTransformClass parent_class;
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};
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GType gst_level_get_type (void);
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G_END_DECLS
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#endif /* __GST_LEVEL_H__ */
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