1 files changed, 96 insertions, 0 deletions
diff --git a/gst/level/gstlevel.h b/gst/level/gstlevel.h
new file mode 100644
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--- /dev/null
+++ b/gst/level/gstlevel.h
@@ -0,0 +1,96 @@
+/* GStreamer
+ * Copyright (C) 1999 Erik Walthinsen <omega@cse.ogi.edu>
+ * Copyright (C) 2000,2001,2002,2003,2005
+ *           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_LEVEL,GstLevelClass))
+#define GST_LEVEL_GET_CLASS(obj) \
+  (G_TYPE_INSTANCE_GET_CLASS((obj),GST_TYPE_LEVEL,GstLevelClass))
+#define GST_IS_LEVEL(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_LEVEL))
+#define GST_IS_LEVEL_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_LEVEL))
+
+
+typedef struct _GstLevel GstLevel;
+typedef struct _GstLevelClass GstLevelClass;
+
+/**
+ * GstLevel:
+ *
+ * Opaque data structure.
+ */
+struct _GstLevel {
+  GstBaseTransform element;
+
+  gboolean message;             /* whether or not to post messages */
+  guint64 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 */
+  gint num_frames;              /* frame count (1 sample per channel)
+                                 * since last emit */
+  gint interval_frames;         /* after how many frame to sent a message */
+  GstClockTime message_ts;      /* starttime for next message */
+
+  /* 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 *decay_peak_base;     /* value of last peak we are decaying from */
+  gdouble *MS;                  /* normalized Mean Square of buffer */
+  gdouble *RMS_dB;              /* RMS in dB to emit */
+  GstClockTime *decay_peak_age; /* age of last peak */
+  
+  void (*process)(gpointer, guint, guint, gdouble*, gdouble*);
+};
+
+struct _GstLevelClass {
+  GstBaseTransformClass parent_class;
+};
+
+GType gst_level_get_type (void);
+
+
+G_END_DECLS
+
+
+#endif /* __GST_LEVEL_H__ */