diff -r 71e347f905f2 -r 4a7fac7dd34a gst_plugins_good/gst/audiofx/audiowsincband.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gst_plugins_good/gst/audiofx/audiowsincband.c	Fri Apr 16 15:15:52 2010 +0300
@@ -0,0 +1,440 @@
+/* -*- 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-audiowsincband
+ *
+ * Attenuates all frequencies outside (bandpass) or inside (bandreject) of a frequency
+ * band. 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 bandpass and bandreject 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 ! audiosincband mode=band-pass lower-frequency=3000 upper-frequency=10000 length=501 window=blackman ! audioconvert ! alsasink
+ * gst-launch filesrc location="melo1.ogg" ! oggdemux ! vorbisdec ! audioconvert ! audiowsincband mode=band-reject lower-frequency=59 upper-frequency=61 length=10001 window=hamming ! audioconvert ! alsasink
+ * gst-launch audiotestsrc wave=white-noise ! audioconvert ! audiowsincband mode=band-pass lower-frequency=1000 upper-frequency=2000 length=31 ! 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 "audiowsincband.h"
+
+#define GST_CAT_DEFAULT gst_gst_audio_wsincband_debug
+GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
+
+enum
+{
+  PROP_0,
+  PROP_LENGTH,
+  PROP_LOWER_FREQUENCY,
+  PROP_UPPER_FREQUENCY,
+  PROP_MODE,
+  PROP_WINDOW
+};
+
+enum
+{
+  MODE_BAND_PASS = 0,
+  MODE_BAND_REJECT
+};
+
+#define GST_TYPE_AUDIO_WSINC_BAND_MODE (gst_gst_audio_wsincband_mode_get_type ())
+static GType
+gst_gst_audio_wsincband_mode_get_type (void)
+{
+  static GType gtype = 0;
+
+  if (gtype == 0) {
+    static const GEnumValue values[] = {
+      {MODE_BAND_PASS, "Band pass (default)",
+          "band-pass"},
+      {MODE_BAND_REJECT, "Band reject",
+          "band-reject"},
+      {0, NULL, NULL}
+    };
+
+    gtype = g_enum_register_static ("GstAudioWSincBandMode", values);
+  }
+  return gtype;
+}
+
+enum
+{
+  WINDOW_HAMMING = 0,
+  WINDOW_BLACKMAN
+};
+
+#define GST_TYPE_AUDIO_WSINC_BAND_WINDOW (gst_gst_audio_wsincband_window_get_type ())
+static GType
+gst_gst_audio_wsincband_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 ("GstAudioWSincBandWindow", values);
+  }
+  return gtype;
+}
+
+#define DEBUG_INIT(bla) \
+  GST_DEBUG_CATEGORY_INIT (gst_gst_audio_wsincband_debug, "audiowsincband", 0, \
+      "Band-pass and Band-reject Windowed sinc filter plugin");
+
+GST_BOILERPLATE_FULL (GstAudioWSincBand, gst_audio_wsincband, GstAudioFilter,
+    GST_TYPE_AUDIO_FX_BASE_FIR_FILTER, DEBUG_INIT);
+
+static void gst_audio_wsincband_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec);
+static void gst_audio_wsincband_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec);
+static void gst_audio_wsincband_finalize (GObject * object);
+
+static gboolean gst_audio_wsincband_setup (GstAudioFilter * base,
+    GstRingBufferSpec * format);
+
+/* Element class */
+static void
+gst_audio_wsincband_base_init (gpointer g_class)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
+
+  gst_element_class_set_details_simple (element_class,
+      "Band pass & band reject filter", "Filter/Effect/Audio",
+      "Band pass and band reject 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_wsincband_class_init (GstAudioWSincBandClass * klass)
+{
+  GObjectClass *gobject_class = (GObjectClass *) klass;
+  GstAudioFilterClass *filter_class = (GstAudioFilterClass *) klass;
+
+  gobject_class->set_property = gst_audio_wsincband_set_property;
+  gobject_class->get_property = gst_audio_wsincband_get_property;
+  gobject_class->finalize = gst_audio_wsincband_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_LOWER_FREQUENCY,
+      g_param_spec_float ("lower-frequency", "Lower Frequency",
+          "Cut-off lower frequency (Hz)", 0.0, 100000.0, 0,
+          G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
+  g_object_class_install_property (gobject_class, PROP_UPPER_FREQUENCY,
+      g_param_spec_float ("upper-frequency", "Upper Frequency",
+          "Cut-off upper frequency (Hz)", 0.0, 100000.0, 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",
+          "Band pass or band reject mode", GST_TYPE_AUDIO_WSINC_BAND_MODE,
+          MODE_BAND_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_BAND_WINDOW,
+          WINDOW_HAMMING,
+          G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
+
+  filter_class->setup = GST_DEBUG_FUNCPTR (gst_audio_wsincband_setup);
+}
+
+static void
+gst_audio_wsincband_init (GstAudioWSincBand * self,
+    GstAudioWSincBandClass * g_class)
+{
+  self->kernel_length = 101;
+  self->lower_frequency = 0.0;
+  self->upper_frequency = 0.0;
+  self->mode = MODE_BAND_PASS;
+  self->window = WINDOW_HAMMING;
+
+  self->lock = g_mutex_new ();
+}
+
+static void
+gst_audio_wsincband_build_kernel (GstAudioWSincBand * self)
+{
+  gint i = 0;
+  gdouble sum = 0.0;
+  gint len = 0;
+  gdouble *kernel_lp, *kernel_hp;
+  gdouble w;
+  gdouble *kernel;
+
+  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 frequencies */
+  self->lower_frequency =
+      CLAMP (self->lower_frequency, 0.0,
+      GST_AUDIO_FILTER (self)->format.rate / 2);
+  self->upper_frequency =
+      CLAMP (self->upper_frequency, 0.0,
+      GST_AUDIO_FILTER (self)->format.rate / 2);
+  if (self->lower_frequency > self->upper_frequency) {
+    gint tmp = self->lower_frequency;
+
+    self->lower_frequency = self->upper_frequency;
+    self->upper_frequency = tmp;
+  }
+
+  GST_DEBUG ("gst_audio_wsincband: initializing filter kernel of length %d "
+      "with lower frequency %.2lf Hz "
+      ", upper frequency %.2lf Hz for mode %s",
+      len, self->lower_frequency, self->upper_frequency,
+      (self->mode == MODE_BAND_PASS) ? "band-pass" : "band-reject");
+
+  /* fill the lp kernel */
+  w = 2 * M_PI * (self->lower_frequency / GST_AUDIO_FILTER (self)->format.rate);
+  kernel_lp = g_new (gdouble, len);
+  for (i = 0; i < len; ++i) {
+    if (i == len / 2)
+      kernel_lp[i] = w;
+    else
+      kernel_lp[i] = sin (w * (i - len / 2))
+          / (i - len / 2);
+    /* Windowing */
+    if (self->window == WINDOW_HAMMING)
+      kernel_lp[i] *= (0.54 - 0.46 * cos (2 * M_PI * i / len));
+    else
+      kernel_lp[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 */
+  sum = 0.0;
+  for (i = 0; i < len; ++i)
+    sum += kernel_lp[i];
+  for (i = 0; i < len; ++i)
+    kernel_lp[i] /= sum;
+
+  /* fill the hp kernel */
+  w = 2 * M_PI * (self->upper_frequency / GST_AUDIO_FILTER (self)->format.rate);
+  kernel_hp = g_new (gdouble, len);
+  for (i = 0; i < len; ++i) {
+    if (i == len / 2)
+      kernel_hp[i] = w;
+    else
+      kernel_hp[i] = sin (w * (i - len / 2))
+          / (i - len / 2);
+    /* Windowing */
+    if (self->window == WINDOW_HAMMING)
+      kernel_hp[i] *= (0.54 - 0.46 * cos (2 * M_PI * i / len));
+    else
+      kernel_hp[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 */
+  sum = 0.0;
+  for (i = 0; i < len; ++i)
+    sum += kernel_hp[i];
+  for (i = 0; i < len; ++i)
+    kernel_hp[i] /= sum;
+
+  /* do spectral inversion to go from lowpass to highpass */
+  for (i = 0; i < len; ++i)
+    kernel_hp[i] = -kernel_hp[i];
+  kernel_hp[len / 2] += 1;
+
+  /* combine the two kernels */
+  kernel = g_new (gdouble, len);
+
+  for (i = 0; i < len; ++i)
+    kernel[i] = kernel_lp[i] + kernel_hp[i];
+
+  /* free the helper kernels */
+  g_free (kernel_lp);
+  g_free (kernel_hp);
+
+  /* do spectral inversion to go from bandreject to bandpass
+   * if specified */
+  if (self->mode == MODE_BAND_PASS) {
+    for (i = 0; i < len; ++i)
+      kernel[i] = -kernel[i];
+    kernel[len / 2] += 1;
+  }
+
+  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_wsincband_setup (GstAudioFilter * base, GstRingBufferSpec * format)
+{
+  GstAudioWSincBand *self = GST_AUDIO_WSINC_BAND (base);
+
+  gst_audio_wsincband_build_kernel (self);
+
+  return GST_AUDIO_FILTER_CLASS (parent_class)->setup (base, format);
+}
+
+static void
+gst_audio_wsincband_finalize (GObject * object)
+{
+  GstAudioWSincBand *self = GST_AUDIO_WSINC_BAND (object);
+
+  g_mutex_free (self->lock);
+  self->lock = NULL;
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gst_audio_wsincband_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  GstAudioWSincBand *self = GST_AUDIO_WSINC_BAND (object);
+
+  g_return_if_fail (GST_IS_AUDIO_WSINC_BAND (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_wsincband_build_kernel (self);
+      }
+      g_mutex_unlock (self->lock);
+      break;
+    }
+    case PROP_LOWER_FREQUENCY:
+      g_mutex_lock (self->lock);
+      self->lower_frequency = g_value_get_float (value);
+      gst_audio_wsincband_build_kernel (self);
+      g_mutex_unlock (self->lock);
+      break;
+    case PROP_UPPER_FREQUENCY:
+      g_mutex_lock (self->lock);
+      self->upper_frequency = g_value_get_float (value);
+      gst_audio_wsincband_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_wsincband_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_wsincband_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_wsincband_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec)
+{
+  GstAudioWSincBand *self = GST_AUDIO_WSINC_BAND (object);
+
+  switch (prop_id) {
+    case PROP_LENGTH:
+      g_value_set_int (value, self->kernel_length);
+      break;
+    case PROP_LOWER_FREQUENCY:
+      g_value_set_float (value, self->lower_frequency);
+      break;
+    case PROP_UPPER_FREQUENCY:
+      g_value_set_float (value, self->upper_frequency);
+      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;
+  }
+}