--- a/gst_plugins_good/gst/audiofx/audiofirfilter.c Fri Jul 09 16:26:45 2010 -0500
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,269 +0,0 @@
-/*
- * 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., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
- *
- */
-
-/**
- * SECTION:element-audiofirfilter
- *
- * audiofirfilter implements a generic audio <ulink url="http://en.wikipedia.org/wiki/Finite_impulse_response">FIR filter</ulink>. Before usage the
- * "kernel" property has to be set to the filter kernel that should be
- * used and the "latency" property has to be set to the latency (in samples)
- * that is introduced by the filter kernel. Setting a latency of n samples
- * will lead to the first n samples being dropped from the output and
- * n samples added to the end.
- *
- * The filter kernel describes the impulse response of the filter. To
- * calculate the frequency response of the filter you have to calculate
- * the Fourier Transform of the impulse response.
- *
- * To change the filter kernel whenever the sampling rate changes the
- * "rate-changed" signal can be used. This should be done for most
- * FIR filters as they're depending on the sampling rate.
- *
- * <refsect2>
- * <title>Example application</title>
- * |[
- * <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" parse="text" href="../../../../tests/examples/audiofx/firfilter-example.c" />
- * ]|
- * </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 "audiofirfilter.h"
-
-#define GST_CAT_DEFAULT gst_audio_fir_filter_debug
-GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
-
-enum
-{
- SIGNAL_RATE_CHANGED,
- LAST_SIGNAL
-};
-
-enum
-{
- PROP_0,
- PROP_KERNEL,
- PROP_LATENCY
-};
-
-static guint gst_audio_fir_filter_signals[LAST_SIGNAL] = { 0, };
-
-#define DEBUG_INIT(bla) \
- GST_DEBUG_CATEGORY_INIT (gst_audio_fir_filter_debug, "audiofirfilter", 0, \
- "Generic audio FIR filter plugin");
-
-GST_BOILERPLATE_FULL (GstAudioFIRFilter, gst_audio_fir_filter, GstAudioFilter,
- GST_TYPE_AUDIO_FX_BASE_FIR_FILTER, DEBUG_INIT);
-
-static void gst_audio_fir_filter_set_property (GObject * object, guint prop_id,
- const GValue * value, GParamSpec * pspec);
-static void gst_audio_fir_filter_get_property (GObject * object, guint prop_id,
- GValue * value, GParamSpec * pspec);
-static void gst_audio_fir_filter_finalize (GObject * object);
-
-static gboolean gst_audio_fir_filter_setup (GstAudioFilter * base,
- GstRingBufferSpec * format);
-
-/* Element class */
-static void
-gst_audio_fir_filter_base_init (gpointer g_class)
-{
- GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
-
- gst_element_class_set_details_simple (element_class,
- "Audio FIR filter", "Filter/Effect/Audio",
- "Generic audio FIR filter with custom filter kernel",
- "Sebastian Dröge <sebastian.droege@collabora.co.uk>");
-}
-
-static void
-gst_audio_fir_filter_class_init (GstAudioFIRFilterClass * klass)
-{
- GObjectClass *gobject_class = (GObjectClass *) klass;
- GstAudioFilterClass *filter_class = (GstAudioFilterClass *) klass;
-
- gobject_class->set_property = gst_audio_fir_filter_set_property;
- gobject_class->get_property = gst_audio_fir_filter_get_property;
- gobject_class->finalize = gst_audio_fir_filter_finalize;
-
- g_object_class_install_property (gobject_class, PROP_KERNEL,
- g_param_spec_value_array ("kernel", "Filter Kernel",
- "Filter kernel for the FIR filter",
- g_param_spec_double ("Element", "Filter Kernel Element",
- "Element of the filter kernel", -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_LATENCY,
- g_param_spec_uint64 ("latency", "Latecy",
- "Filter latency in samples",
- 0, G_MAXUINT64, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
-
- filter_class->setup = GST_DEBUG_FUNCPTR (gst_audio_fir_filter_setup);
-
- /**
- * GstAudioFIRFilter::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_fir_filter_signals[SIGNAL_RATE_CHANGED] =
- g_signal_new ("rate-changed", G_TYPE_FROM_CLASS (klass),
- G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstAudioFIRFilterClass, rate_changed),
- NULL, NULL, gst_marshal_VOID__INT, G_TYPE_NONE, 1, G_TYPE_INT);
-}
-
-static void
-gst_audio_fir_filter_update_kernel (GstAudioFIRFilter * self, GValueArray * va)
-{
- gdouble *kernel;
- guint i;
-
- gst_audio_fx_base_fir_filter_push_residue (GST_AUDIO_FX_BASE_FIR_FILTER
- (self));
-
- if (va) {
- if (self->kernel)
- g_value_array_free (self->kernel);
-
- self->kernel = va;
- }
-
- kernel = g_new (gdouble, self->kernel->n_values);
-
- for (i = 0; i < self->kernel->n_values; i++) {
- GValue *v = g_value_array_get_nth (self->kernel, i);
- kernel[i] = g_value_get_double (v);
- }
-
- gst_audio_fx_base_fir_filter_set_kernel (GST_AUDIO_FX_BASE_FIR_FILTER (self),
- kernel, self->kernel->n_values, self->latency);
-}
-
-static void
-gst_audio_fir_filter_init (GstAudioFIRFilter * self,
- GstAudioFIRFilterClass * g_class)
-{
- GValue v = { 0, };
- GValueArray *va;
-
- self->latency = 0;
- va = g_value_array_new (1);
-
- g_value_init (&v, G_TYPE_DOUBLE);
- g_value_set_double (&v, 1.0);
- g_value_array_append (va, &v);
- g_value_unset (&v);
- gst_audio_fir_filter_update_kernel (self, va);
-
- self->lock = g_mutex_new ();
-}
-
-/* GstAudioFilter vmethod implementations */
-
-/* get notified of caps and plug in the correct process function */
-static gboolean
-gst_audio_fir_filter_setup (GstAudioFilter * base, GstRingBufferSpec * format)
-{
- GstAudioFIRFilter *self = GST_AUDIO_FIR_FILTER (base);
-
- if (self->rate != format->rate) {
- g_signal_emit (G_OBJECT (self),
- gst_audio_fir_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_fir_filter_finalize (GObject * object)
-{
- GstAudioFIRFilter *self = GST_AUDIO_FIR_FILTER (object);
-
- g_mutex_free (self->lock);
- self->lock = NULL;
-
- if (self->kernel)
- g_value_array_free (self->kernel);
- self->kernel = NULL;
-
- G_OBJECT_CLASS (parent_class)->finalize (object);
-}
-
-static void
-gst_audio_fir_filter_set_property (GObject * object, guint prop_id,
- const GValue * value, GParamSpec * pspec)
-{
- GstAudioFIRFilter *self = GST_AUDIO_FIR_FILTER (object);
-
- g_return_if_fail (GST_IS_AUDIO_FIR_FILTER (self));
-
- switch (prop_id) {
- case PROP_KERNEL:
- g_mutex_lock (self->lock);
- gst_audio_fx_base_fir_filter_push_residue (GST_AUDIO_FX_BASE_FIR_FILTER
- (self));
-
- gst_audio_fir_filter_update_kernel (self, g_value_dup_boxed (value));
- g_mutex_unlock (self->lock);
- break;
- case PROP_LATENCY:
- g_mutex_lock (self->lock);
- self->latency = g_value_get_uint64 (value);
- gst_audio_fir_filter_update_kernel (self, NULL);
- g_mutex_unlock (self->lock);
- break;
- default:
- G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
- break;
- }
-}
-
-static void
-gst_audio_fir_filter_get_property (GObject * object, guint prop_id,
- GValue * value, GParamSpec * pspec)
-{
- GstAudioFIRFilter *self = GST_AUDIO_FIR_FILTER (object);
-
- switch (prop_id) {
- case PROP_KERNEL:
- g_value_set_boxed (value, self->kernel);
- break;
- case PROP_LATENCY:
- g_value_set_uint64 (value, self->latency);
- break;
- default:
- G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
- break;
- }
-}