Release 1.1.4

[platform/upstream/gst-plugins-good.git] / gst / audiofx / audiowsinclimit.h

diff --git a/gst/audiofx/audiowsinclimit.h b/gst/audiofx/audiowsinclimit.h
index bc9377f..e7fa915 100644 (file)
--- a/gst/audiofx/audiowsinclimit.h
+++ b/gst/audiofx/audiowsinclimit.h
@@ -3,6 +3,7 @@
  * GStreamer
  * Copyright (C) 1999-2001 Erik Walthinsen <omega@cse.ogi.edu>
  *               2006 Dreamlab Technologies Ltd. <mathis.hofer@dreamlab.net>
+ *               2007-2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ -16,8 +17,8 @@
  *
  * 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.
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
  * 
  * 
  * this windowed sinc filter is taken from the freely downloadable DSP book,
@@ -25,61 +26,55 @@
  * chapter 16
  * available at http://www.dspguide.com/
  *
- * FIXME:
- * - this filter is totally unoptimized !
- * - we do not destroy the allocated memory for filters and residue
- * - this might be improved upon with bytestream
  */
 
-#ifndef __GST_LPWSINC_H__
-#define __GST_LPWSINC_H__
+#ifndef __GST_AUDIO_WSINC_LIMIT_H__
+#define __GST_AUDIO_WSINC_LIMIT_H__
 
-#include "gstfilter.h"
 #include <gst/gst.h>
 #include <gst/audio/gstaudiofilter.h>
 
-G_BEGIN_DECLS
+#include "audiofxbasefirfilter.h"
 
-#define GST_TYPE_LPWSINC \
-  (gst_lpwsinc_get_type())
-#define GST_LPWSINC(obj) \
-  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_LPWSINC,GstLPWSinc))
-#define GST_LPWSINC_CLASS(klass) \
-  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_LPWSINC,GstLPWSincClass))
-#define GST_IS_LPWSINC(obj) \
-  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_LPWSINC))
-#define GST_IS_LPWSINC_CLASS(klass) \
-  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_LPWSINC))
+G_BEGIN_DECLS
 
-typedef struct _GstLPWSinc GstLPWSinc;
-typedef struct _GstLPWSincClass GstLPWSincClass;
+#define GST_TYPE_AUDIO_WSINC_LIMIT \
+  (gst_audio_wsinclimit_get_type())
+#define GST_AUDIO_WSINC_LIMIT(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_WSINC_LIMIT,GstAudioWSincLimit))
+#define GST_AUDIO_WSINC_LIMIT_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_AUDIO_WSINC_LIMIT,GstAudioWSincLimitClass))
+#define GST_IS_AUDIO_WSINC_LIMIT(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_WSINC_LIMIT))
+#define GST_IS_AUDIO_WSINC_LIMIT_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AUDIO_WSINC_LIMIT))
 
-typedef void (*GstLPWSincProcessFunc) (GstLPWSinc *, guint8 *, guint8 *, guint);
+typedef struct _GstAudioWSincLimit GstAudioWSincLimit;
+typedef struct _GstAudioWSincLimitClass GstAudioWSincLimitClass;
 
 /**
- * GstLPWSinc:
+ * GstAudioWSincLimit:
  *
  * Opaque data structure.
  */
-struct _GstLPWSinc {
-  GstAudioFilter element;
-
-  GstLPWSincProcessFunc process;
+struct _GstAudioWSincLimit {
+  GstAudioFXBaseFIRFilter parent;
 
   gint mode;
-  gdouble frequency;
-  gint wing_size;               /* length of a "wing" of the filter; 
-                                   actual length is 2 * wing_size + 1 */
+  gint window;
+  gfloat cutoff;
+  gint kernel_length;
 
-  gdouble *residue;             /* buffer for left-over samples from previous buffer */
-  gdouble *kernel;              /* filter kernel */
-  gboolean have_kernel;
+  /* < private > */
+  GMutex lock;
 };
 
-struct _GstLPWSincClass {
-  GstAudioFilterClass parent_class;
+struct _GstAudioWSincLimitClass {
+  GstAudioFXBaseFIRFilterClass parent;
 };
 
+GType gst_audio_wsinclimit_get_type (void);
+
 G_END_DECLS
 
-#endif /* __GST_LPWSINC_H__ */
+#endif /* __GST_AUDIO_WSINC_LIMIT_H__ */