diff -r 29ecd5cb86b3 -r d43ce56a1534 gst_plugins_good/gst/audiofx/audioiirfilter.c --- a/gst_plugins_good/gst/audiofx/audioiirfilter.c Tue Jul 06 14:35:10 2010 +0300 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,287 +0,0 @@ -/* - * GStreamer - * Copyright (C) 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. - * - */ - -/** - * SECTION:element-audioiirfilter - * - * audioiirfilter implements a generic audio IIR filter. Before usage the - * "a" and "b" properties have to be set to the filter coefficients that - * should be used. - * - * The filter coefficients describe the numerator and denominator of the - * transfer function. - * - * To change the filter coefficients whenever the sampling rate changes the - * "rate-changed" signal can be used. This should be done for most - * IIR filters as they're depending on the sampling rate. - * - * - * Example application - * |[ - * - * ]| - * - */ - -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif - -#include -#include -#include -#include -#include - -#include "audioiirfilter.h" - -#define GST_CAT_DEFAULT gst_audio_iir_filter_debug -GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT); - -enum -{ - SIGNAL_RATE_CHANGED, - LAST_SIGNAL -}; - -enum -{ - PROP_0, - PROP_A, - PROP_B -}; - -static guint gst_audio_iir_filter_signals[LAST_SIGNAL] = { 0, }; - -#define DEBUG_INIT(bla) \ - GST_DEBUG_CATEGORY_INIT (gst_audio_iir_filter_debug, "audioiirfilter", 0, \ - "Generic audio IIR filter plugin"); - -GST_BOILERPLATE_FULL (GstAudioIIRFilter, gst_audio_iir_filter, GstAudioFilter, - GST_TYPE_AUDIO_FX_BASE_IIR_FILTER, DEBUG_INIT); - -static void gst_audio_iir_filter_set_property (GObject * object, guint prop_id, - const GValue * value, GParamSpec * pspec); -static void gst_audio_iir_filter_get_property (GObject * object, guint prop_id, - GValue * value, GParamSpec * pspec); -static void gst_audio_iir_filter_finalize (GObject * object); - -static gboolean gst_audio_iir_filter_setup (GstAudioFilter * base, - GstRingBufferSpec * format); - -/* Element class */ -static void -gst_audio_iir_filter_base_init (gpointer g_class) -{ - GstElementClass *element_class = GST_ELEMENT_CLASS (g_class); - - gst_element_class_set_details_simple (element_class, - "Audio IIR filter", "Filter/Effect/Audio", - "Generic audio IIR filter with custom filter kernel", - "Sebastian Dröge "); -} - -static void -gst_audio_iir_filter_class_init (GstAudioIIRFilterClass * klass) -{ - GObjectClass *gobject_class = (GObjectClass *) klass; - GstAudioFilterClass *filter_class = (GstAudioFilterClass *) klass; - - gobject_class->set_property = gst_audio_iir_filter_set_property; - gobject_class->get_property = gst_audio_iir_filter_get_property; - gobject_class->finalize = gst_audio_iir_filter_finalize; - - g_object_class_install_property (gobject_class, PROP_A, - g_param_spec_value_array ("a", "A", - "Filter coefficients (numerator of transfer function)", - g_param_spec_double ("Coefficient", "Filter Coefficient", - "Filter coefficient", -G_MAXDOUBLE, G_MAXDOUBLE, 0.0, - G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS), - G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); - g_object_class_install_property (gobject_class, PROP_B, - g_param_spec_value_array ("b", "B", - "Filter coefficients (denominator of transfer function)", - g_param_spec_double ("Coefficient", "Filter Coefficient", - "Filter coefficient", -G_MAXDOUBLE, G_MAXDOUBLE, 0.0, - G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS), - G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); - - filter_class->setup = GST_DEBUG_FUNCPTR (gst_audio_iir_filter_setup); - - /** - * GstAudioIIRFilter::rate-changed: - * @filter: the filter on which the signal is emitted - * @rate: the new sampling rate - * - * Will be emitted when the sampling rate changes. The callbacks - * will be called from the streaming thread and processing will - * stop until the event is handled. - */ - gst_audio_iir_filter_signals[SIGNAL_RATE_CHANGED] = - g_signal_new ("rate-changed", G_TYPE_FROM_CLASS (klass), - G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstAudioIIRFilterClass, rate_changed), - NULL, NULL, gst_marshal_VOID__INT, G_TYPE_NONE, 1, G_TYPE_INT); -} - -static void -gst_audio_iir_filter_update_coefficients (GstAudioIIRFilter * self, - GValueArray * va, GValueArray * vb) -{ - gdouble *a = NULL, *b = NULL; - guint i; - - if (va) { - if (self->a) - g_value_array_free (self->a); - - self->a = va; - } - if (vb) { - if (self->b) - g_value_array_free (self->b); - - self->b = vb; - } - - if (self->a && self->a->n_values > 0) - a = g_new (gdouble, self->a->n_values); - if (self->b && self->b->n_values > 0) - b = g_new (gdouble, self->b->n_values); - - if (self->a) { - for (i = 0; i < self->a->n_values; i++) { - GValue *v = g_value_array_get_nth (self->a, i); - a[i] = g_value_get_double (v); - } - } - - if (self->b) { - for (i = 0; i < self->b->n_values; i++) { - GValue *v = g_value_array_get_nth (self->b, i); - b[i] = g_value_get_double (v); - } - } - - gst_audio_fx_base_iir_filter_set_coefficients (GST_AUDIO_FX_BASE_IIR_FILTER - (self), a, (self->a) ? self->a->n_values : 0, b, - (self->b) ? self->b->n_values : 0); -} - -static void -gst_audio_iir_filter_init (GstAudioIIRFilter * self, - GstAudioIIRFilterClass * g_class) -{ - GValue v = { 0, }; - GValueArray *a, *b; - - a = g_value_array_new (1); - - g_value_init (&v, G_TYPE_DOUBLE); - g_value_set_double (&v, 1.0); - g_value_array_append (a, &v); - g_value_unset (&v); - - b = NULL; - gst_audio_iir_filter_update_coefficients (self, a, b); - - self->lock = g_mutex_new (); -} - -/* GstAudioFilter vmethod implementations */ - -/* get notified of caps and plug in the correct process function */ -static gboolean -gst_audio_iir_filter_setup (GstAudioFilter * base, GstRingBufferSpec * format) -{ - GstAudioIIRFilter *self = GST_AUDIO_IIR_FILTER (base); - - if (self->rate != format->rate) { - g_signal_emit (G_OBJECT (self), - gst_audio_iir_filter_signals[SIGNAL_RATE_CHANGED], 0, format->rate); - self->rate = format->rate; - } - - return GST_AUDIO_FILTER_CLASS (parent_class)->setup (base, format); -} - -static void -gst_audio_iir_filter_finalize (GObject * object) -{ - GstAudioIIRFilter *self = GST_AUDIO_IIR_FILTER (object); - - g_mutex_free (self->lock); - self->lock = NULL; - - if (self->a) - g_value_array_free (self->a); - self->a = NULL; - if (self->b) - g_value_array_free (self->b); - self->b = NULL; - - G_OBJECT_CLASS (parent_class)->finalize (object); -} - -static void -gst_audio_iir_filter_set_property (GObject * object, guint prop_id, - const GValue * value, GParamSpec * pspec) -{ - GstAudioIIRFilter *self = GST_AUDIO_IIR_FILTER (object); - - g_return_if_fail (GST_IS_AUDIO_IIR_FILTER (self)); - - switch (prop_id) { - case PROP_A: - g_mutex_lock (self->lock); - gst_audio_iir_filter_update_coefficients (self, g_value_dup_boxed (value), - NULL); - g_mutex_unlock (self->lock); - break; - case PROP_B: - g_mutex_lock (self->lock); - gst_audio_iir_filter_update_coefficients (self, NULL, - g_value_dup_boxed (value)); - g_mutex_unlock (self->lock); - break; - default: - G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); - break; - } -} - -static void -gst_audio_iir_filter_get_property (GObject * object, guint prop_id, - GValue * value, GParamSpec * pspec) -{ - GstAudioIIRFilter *self = GST_AUDIO_IIR_FILTER (object); - - switch (prop_id) { - case PROP_A: - g_value_set_boxed (value, self->a); - break; - case PROP_B: - g_value_set_boxed (value, self->b); - break; - default: - G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); - break; - } -}