| /* |
| * GStreamer |
| * Copyright (C) 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., 51 Franklin St, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| /** |
| * SECTION:element-audioiirfilter |
| * |
| * audioiirfilter implements a generic audio <ulink url="http://en.wikipedia.org/wiki/Infinite_impulse_response">IIR filter</ulink>. 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. |
| * |
| * <refsect2> |
| * <title>Example application</title> |
| * <informalexample><programlisting language="C"> |
| * <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" parse="text" href="../../../../tests/examples/audiofx/iirfilter-example.c" /> |
| * </programlisting></informalexample> |
| * </refsect2> |
| */ |
| |
| /* FIXME 0.11: suppress warnings for deprecated API such as GValueArray |
| * with newer GLib versions (>= 2.31.0) */ |
| #define GLIB_DISABLE_DEPRECATION_WARNINGS |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <string.h> |
| #include <math.h> |
| #include <gst/gst.h> |
| #include <gst/audio/gstaudiofilter.h> |
| |
| #include "audioiirfilter.h" |
| |
| #include "gst/glib-compat-private.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 gst_audio_iir_filter_parent_class parent_class |
| G_DEFINE_TYPE (GstAudioIIRFilter, gst_audio_iir_filter, |
| GST_TYPE_AUDIO_FX_BASE_IIR_FILTER); |
| |
| 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, |
| const GstAudioInfo * info); |
| |
| static void |
| gst_audio_iir_filter_class_init (GstAudioIIRFilterClass * klass) |
| { |
| GObjectClass *gobject_class = (GObjectClass *) klass; |
| GstElementClass *gstelement_class = (GstElementClass *) klass; |
| GstAudioFilterClass *filter_class = (GstAudioFilterClass *) klass; |
| |
| GST_DEBUG_CATEGORY_INIT (gst_audio_iir_filter_debug, "audioiirfilter", 0, |
| "Generic audio IIR filter plugin"); |
| |
| 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 (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)); |
| g_object_class_install_property (gobject_class, PROP_B, |
| g_param_spec_value_array ("b", "B", |
| "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)); |
| |
| 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, NULL, G_TYPE_NONE, 1, G_TYPE_INT); |
| |
| gst_element_class_set_static_metadata (gstelement_class, |
| "Audio IIR filter", "Filter/Effect/Audio", |
| "Generic audio IIR filter with custom filter kernel", |
| "Sebastian Dröge <sebastian.droege@collabora.co.uk>"); |
| } |
| |
| 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); |
| |
| 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 && self->b->n_values > 0) { |
| b = g_new (gdouble, self->b->n_values); |
| 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) |
| { |
| GValue v = { 0, }; |
| GValueArray *a; |
| |
| 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); |
| |
| gst_audio_iir_filter_update_coefficients (self, a, g_value_array_copy (a)); |
| |
| g_mutex_init (&self->lock); |
| } |
| |
| /* GstAudioFilter vmethod implementations */ |
| |
| /* get notified of caps and plug in the correct process function */ |
| static gboolean |
| gst_audio_iir_filter_setup (GstAudioFilter * base, const GstAudioInfo * info) |
| { |
| GstAudioIIRFilter *self = GST_AUDIO_IIR_FILTER (base); |
| gint new_rate = GST_AUDIO_INFO_RATE (info); |
| |
| if (GST_AUDIO_FILTER_RATE (self) != new_rate) { |
| g_signal_emit (G_OBJECT (self), |
| gst_audio_iir_filter_signals[SIGNAL_RATE_CHANGED], 0, new_rate); |
| } |
| |
| return GST_AUDIO_FILTER_CLASS (parent_class)->setup (base, info); |
| } |
| |
| static void |
| gst_audio_iir_filter_finalize (GObject * object) |
| { |
| GstAudioIIRFilter *self = GST_AUDIO_IIR_FILTER (object); |
| |
| g_mutex_clear (&self->lock); |
| |
| 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; |
| } |
| } |