--- a/gst_plugins_good/gst/audiofx/audiowsinclimit.c	Fri Jul 09 16:26:45 2010 -0500
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,373 +0,0 @@
-/* -*- c-basic-offset: 2 -*-
- * 
- * 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
- * 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.
- * 
- * 
- * this windowed sinc filter is taken from the freely downloadable DSP book,
- * "The Scientist and Engineer's Guide to Digital Signal Processing",
- * chapter 16
- * available at http://www.dspguide.com/
- *
- */
-
-/**
- * SECTION:element-audiowsinclimit
- *
- * Attenuates all frequencies above the cutoff frequency (low-pass) or all frequencies below the
- * cutoff frequency (high-pass). The length parameter controls the rolloff, the window parameter
- * controls rolloff and stopband attenuation. The Hamming window provides a faster rolloff but a bit
- * worse stopband attenuation, the other way around for the Blackman window.
- *
- * This element has the advantage over the Chebyshev lowpass and highpass filter that it has
- * a much better rolloff when using a larger kernel size and almost linear phase. The only
- * disadvantage is the much slower execution time with larger kernels.
- *
- * <refsect2>
- * <title>Example launch line</title>
- * |[
- * gst-launch audiotestsrc freq=1500 ! audioconvert ! audiowsinclimit mode=low-pass frequency=1000 length=501 ! audioconvert ! alsasink
- * gst-launch filesrc location="melo1.ogg" ! oggdemux ! vorbisdec ! audioconvert ! audiowsinclimit mode=high-pass frequency=15000 length=501 ! audioconvert ! alsasink
- * gst-launch audiotestsrc wave=white-noise ! audioconvert ! audiowsinclimit mode=low-pass frequency=1000 length=10001 window=blackman ! audioconvert ! alsasink
- * ]|
- * </refsect2>
- */
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include <string.h>
-#include <math.h>
-#include <gst/gst.h>
-#include <gst/audio/gstaudiofilter.h>
-#include <gst/controller/gstcontroller.h>
-
-#include "audiowsinclimit.h"
-
-#define GST_CAT_DEFAULT gst_audio_wsinclimit_debug
-GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
-
-enum
-{
-  PROP_0,
-  PROP_LENGTH,
-  PROP_FREQUENCY,
-  PROP_MODE,
-  PROP_WINDOW
-};
-
-enum
-{
-  MODE_LOW_PASS = 0,
-  MODE_HIGH_PASS
-};
-
-#define GST_TYPE_AUDIO_WSINC_LIMIT_MODE (gst_audio_wsinclimit_mode_get_type ())
-static GType
-gst_audio_wsinclimit_mode_get_type (void)
-{
-  static GType gtype = 0;
-
-  if (gtype == 0) {
-    static const GEnumValue values[] = {
-      {MODE_LOW_PASS, "Low pass (default)",
-          "low-pass"},
-      {MODE_HIGH_PASS, "High pass",
-          "high-pass"},
-      {0, NULL, NULL}
-    };
-
-    gtype = g_enum_register_static ("GstAudioWSincLimitMode", values);
-  }
-  return gtype;
-}
-
-enum
-{
-  WINDOW_HAMMING = 0,
-  WINDOW_BLACKMAN
-};
-
-#define GST_TYPE_AUDIO_WSINC_LIMIT_WINDOW (gst_audio_wsinclimit_window_get_type ())
-static GType
-gst_audio_wsinclimit_window_get_type (void)
-{
-  static GType gtype = 0;
-
-  if (gtype == 0) {
-    static const GEnumValue values[] = {
-      {WINDOW_HAMMING, "Hamming window (default)",
-          "hamming"},
-      {WINDOW_BLACKMAN, "Blackman window",
-          "blackman"},
-      {0, NULL, NULL}
-    };
-
-    gtype = g_enum_register_static ("GstAudioWSincLimitWindow", values);
-  }
-  return gtype;
-}
-
-#define DEBUG_INIT(bla) \
-  GST_DEBUG_CATEGORY_INIT (gst_audio_wsinclimit_debug, "audiowsinclimit", 0, \
-      "Low-pass and High-pass Windowed sinc filter plugin");
-
-GST_BOILERPLATE_FULL (GstAudioWSincLimit, gst_audio_wsinclimit, GstAudioFilter,
-    GST_TYPE_AUDIO_FX_BASE_FIR_FILTER, DEBUG_INIT);
-
-static void gst_audio_wsinclimit_set_property (GObject * object, guint prop_id,
-    const GValue * value, GParamSpec * pspec);
-static void gst_audio_wsinclimit_get_property (GObject * object, guint prop_id,
-    GValue * value, GParamSpec * pspec);
-static void gst_audio_wsinclimit_finalize (GObject * object);
-
-static gboolean gst_audio_wsinclimit_setup (GstAudioFilter * base,
-    GstRingBufferSpec * format);
-
-/* Element class */
-
-static void
-gst_audio_wsinclimit_base_init (gpointer g_class)
-{
-  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
-
-  gst_element_class_set_details_simple (element_class,
-      "Low pass & high pass filter", "Filter/Effect/Audio",
-      "Low pass and high pass windowed sinc filter",
-      "Thomas Vander Stichele <thomas at apestaart dot org>, "
-      "Steven W. Smith, "
-      "Dreamlab Technologies Ltd. <mathis.hofer@dreamlab.net>, "
-      "Sebastian Dröge <sebastian.droege@collabora.co.uk>");
-}
-
-static void
-gst_audio_wsinclimit_class_init (GstAudioWSincLimitClass * klass)
-{
-  GObjectClass *gobject_class = (GObjectClass *) klass;
-  GstAudioFilterClass *filter_class = (GstAudioFilterClass *) klass;
-
-  gobject_class->set_property = gst_audio_wsinclimit_set_property;
-  gobject_class->get_property = gst_audio_wsinclimit_get_property;
-  gobject_class->finalize = gst_audio_wsinclimit_finalize;
-
-  /* FIXME: Don't use the complete possible range but restrict the upper boundary
-   * so automatically generated UIs can use a slider */
-  g_object_class_install_property (gobject_class, PROP_FREQUENCY,
-      g_param_spec_float ("cutoff", "Cutoff",
-          "Cut-off Frequency (Hz)", 0.0, 100000.0, 0.0,
-          G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
-  g_object_class_install_property (gobject_class, PROP_LENGTH,
-      g_param_spec_int ("length", "Length",
-          "Filter kernel length, will be rounded to the next odd number",
-          3, 50000, 101,
-          G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
-
-  g_object_class_install_property (gobject_class, PROP_MODE,
-      g_param_spec_enum ("mode", "Mode",
-          "Low pass or high pass mode", GST_TYPE_AUDIO_WSINC_LIMIT_MODE,
-          MODE_LOW_PASS,
-          G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
-
-  g_object_class_install_property (gobject_class, PROP_WINDOW,
-      g_param_spec_enum ("window", "Window",
-          "Window function to use", GST_TYPE_AUDIO_WSINC_LIMIT_WINDOW,
-          WINDOW_HAMMING,
-          G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
-
-  filter_class->setup = GST_DEBUG_FUNCPTR (gst_audio_wsinclimit_setup);
-}
-
-static void
-gst_audio_wsinclimit_init (GstAudioWSincLimit * self,
-    GstAudioWSincLimitClass * g_class)
-{
-  self->mode = MODE_LOW_PASS;
-  self->window = WINDOW_HAMMING;
-  self->kernel_length = 101;
-  self->cutoff = 0.0;
-
-  self->lock = g_mutex_new ();
-}
-
-static void
-gst_audio_wsinclimit_build_kernel (GstAudioWSincLimit * self)
-{
-  gint i = 0;
-  gdouble sum = 0.0;
-  gint len = 0;
-  gdouble w;
-  gdouble *kernel = NULL;
-
-  len = self->kernel_length;
-
-  if (GST_AUDIO_FILTER (self)->format.rate == 0) {
-    GST_DEBUG ("rate not set yet");
-    return;
-  }
-
-  if (GST_AUDIO_FILTER (self)->format.channels == 0) {
-    GST_DEBUG ("channels not set yet");
-    return;
-  }
-
-  /* Clamp cutoff frequency between 0 and the nyquist frequency */
-  self->cutoff =
-      CLAMP (self->cutoff, 0.0, GST_AUDIO_FILTER (self)->format.rate / 2);
-
-  GST_DEBUG ("gst_audio_wsinclimit_: initializing filter kernel of length %d "
-      "with cutoff %.2lf Hz "
-      "for mode %s",
-      len, self->cutoff,
-      (self->mode == MODE_LOW_PASS) ? "low-pass" : "high-pass");
-
-  /* fill the kernel */
-  w = 2 * M_PI * (self->cutoff / GST_AUDIO_FILTER (self)->format.rate);
-
-  kernel = g_new (gdouble, len);
-
-  for (i = 0; i < len; ++i) {
-    if (i == len / 2)
-      kernel[i] = w;
-    else
-      kernel[i] = sin (w * (i - len / 2)) / (i - len / 2);
-    /* windowing */
-    if (self->window == WINDOW_HAMMING)
-      kernel[i] *= (0.54 - 0.46 * cos (2 * M_PI * i / len));
-    else
-      kernel[i] *= (0.42 - 0.5 * cos (2 * M_PI * i / len) +
-          0.08 * cos (4 * M_PI * i / len));
-  }
-
-  /* normalize for unity gain at DC */
-  for (i = 0; i < len; ++i)
-    sum += kernel[i];
-  for (i = 0; i < len; ++i)
-    kernel[i] /= sum;
-
-  /* convert to highpass if specified */
-  if (self->mode == MODE_HIGH_PASS) {
-    for (i = 0; i < len; ++i)
-      kernel[i] = -kernel[i];
-    kernel[len / 2] += 1.0;
-  }
-
-  gst_audio_fx_base_fir_filter_set_kernel (GST_AUDIO_FX_BASE_FIR_FILTER (self),
-      kernel, self->kernel_length, (len - 1) / 2);
-}
-
-/* GstAudioFilter vmethod implementations */
-
-/* get notified of caps and plug in the correct process function */
-static gboolean
-gst_audio_wsinclimit_setup (GstAudioFilter * base, GstRingBufferSpec * format)
-{
-  GstAudioWSincLimit *self = GST_AUDIO_WSINC_LIMIT (base);
-
-  gst_audio_wsinclimit_build_kernel (self);
-
-  return GST_AUDIO_FILTER_CLASS (parent_class)->setup (base, format);
-}
-
-static void
-gst_audio_wsinclimit_finalize (GObject * object)
-{
-  GstAudioWSincLimit *self = GST_AUDIO_WSINC_LIMIT (object);
-
-  g_mutex_free (self->lock);
-  self->lock = NULL;
-
-  G_OBJECT_CLASS (parent_class)->finalize (object);
-}
-
-static void
-gst_audio_wsinclimit_set_property (GObject * object, guint prop_id,
-    const GValue * value, GParamSpec * pspec)
-{
-  GstAudioWSincLimit *self = GST_AUDIO_WSINC_LIMIT (object);
-
-  g_return_if_fail (GST_IS_AUDIO_WSINC_LIMIT (self));
-
-  switch (prop_id) {
-    case PROP_LENGTH:{
-      gint val;
-
-      g_mutex_lock (self->lock);
-      val = g_value_get_int (value);
-      if (val % 2 == 0)
-        val++;
-
-      if (val != self->kernel_length) {
-        gst_audio_fx_base_fir_filter_push_residue (GST_AUDIO_FX_BASE_FIR_FILTER
-            (self));
-        self->kernel_length = val;
-        gst_audio_wsinclimit_build_kernel (self);
-      }
-      g_mutex_unlock (self->lock);
-      break;
-    }
-    case PROP_FREQUENCY:
-      g_mutex_lock (self->lock);
-      self->cutoff = g_value_get_float (value);
-      gst_audio_wsinclimit_build_kernel (self);
-      g_mutex_unlock (self->lock);
-      break;
-    case PROP_MODE:
-      g_mutex_lock (self->lock);
-      self->mode = g_value_get_enum (value);
-      gst_audio_wsinclimit_build_kernel (self);
-      g_mutex_unlock (self->lock);
-      break;
-    case PROP_WINDOW:
-      g_mutex_lock (self->lock);
-      self->window = g_value_get_enum (value);
-      gst_audio_wsinclimit_build_kernel (self);
-      g_mutex_unlock (self->lock);
-      break;
-    default:
-      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
-      break;
-  }
-}
-
-static void
-gst_audio_wsinclimit_get_property (GObject * object, guint prop_id,
-    GValue * value, GParamSpec * pspec)
-{
-  GstAudioWSincLimit *self = GST_AUDIO_WSINC_LIMIT (object);
-
-  switch (prop_id) {
-    case PROP_LENGTH:
-      g_value_set_int (value, self->kernel_length);
-      break;
-    case PROP_FREQUENCY:
-      g_value_set_float (value, self->cutoff);
-      break;
-    case PROP_MODE:
-      g_value_set_enum (value, self->mode);
-      break;
-    case PROP_WINDOW:
-      g_value_set_enum (value, self->window);
-      break;
-    default:
-      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
-      break;
-  }
-}