diff -r 29ecd5cb86b3 -r d43ce56a1534 gst_plugins_good/gst/audiofx/audiowsinclimit.c --- a/gst_plugins_good/gst/audiofx/audiowsinclimit.c Tue Jul 06 14:35:10 2010 +0300 +++ /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 - * 2006 Dreamlab Technologies Ltd. - * 2007-2009 Sebastian Dröge - * - * 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. - * - * - * Example launch line - * |[ - * 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 - * ]| - * - */ - -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif - -#include -#include -#include -#include -#include - -#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 , " - "Steven W. Smith, " - "Dreamlab Technologies Ltd. , " - "Sebastian Dröge "); -} - -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; - } -}