#include <string.h>
#include <math.h>
#include <gst/gst.h>
#include <gst/audio/gstaudiofilter.h>
#include "audioiirfilter.h"
#include "gst/glib-compat-private.h"

Include dependency graph for audioiirfilter.c:

Macros
#define	GLIB_DISABLE_DEPRECATION_WARNINGS

#define	GST_CAT_DEFAULT gst_audio_iir_filter_debug

#define	gst_audio_iir_filter_parent_class parent_class

Enumerations
enum	{ SIGNAL_RATE_CHANGED , LAST_SIGNAL }

enum	{ PROP_0 , PROP_A , PROP_B }

Functions
	GST_DEBUG_CATEGORY_STATIC (gst_audio_iir_filter_debug)

	G_DEFINE_TYPE (GstAudioIIRFilter, gst_audio_iir_filter,(gst_audio_fx_base_iir_filter_get_type()))

	GST_ELEMENT_REGISTER_DEFINE (audioiirfilter, "audioiirfilter", GST_RANK_NONE,(gst_audio_iir_filter_get_type()))

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)

static void	gst_audio_iir_filter_update_coefficients (GstAudioIIRFilter self, GValueArray va, GValueArray *vb)

static void	gst_audio_iir_filter_init (GstAudioIIRFilter *self)

Variables
static guint	gst_audio_iir_filter_signals [LAST_SIGNAL] = { 0, }

Macro Definition Documentation

◆ GLIB_DISABLE_DEPRECATION_WARNINGS

#define GLIB_DISABLE_DEPRECATION_WARNINGS

SECTION:element-audioiirfilter @title: 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

<programlisting language="C"> <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" parse="text" href="../../../../tests/examples/audiofx/iirfilter-example.c" /> ]|

Definition at line 47 of file audioiirfilter.c.

◆ gst_audio_iir_filter_parent_class

#define gst_audio_iir_filter_parent_class parent_class

Definition at line 80 of file audioiirfilter.c.

◆ GST_CAT_DEFAULT

#define GST_CAT_DEFAULT gst_audio_iir_filter_debug

Definition at line 62 of file audioiirfilter.c.

Enumeration Type Documentation

◆ anonymous enum

anonymous enum

Enumerator
SIGNAL_RATE_CHANGED
LAST_SIGNAL

Definition at line 65 of file audioiirfilter.c.

◆ anonymous enum

anonymous enum

Enumerator
PROP_0
PROP_A
PROP_B

Definition at line 71 of file audioiirfilter.c.

Function Documentation

◆ G_DEFINE_TYPE()

G_DEFINE_TYPE	(	GstAudioIIRFilter	,
		gst_audio_iir_filter	,
		(gst_audio_fx_base_iir_filter_get_type())
	)

◆ gst_audio_iir_filter_class_init()

static void gst_audio_iir_filter_class_init ( GstAudioIIRFilterClass * klass )

static

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.

Definition at line 96 of file audioiirfilter.c.

References gst_audio_iir_filter_finalize(), gst_audio_iir_filter_get_property(), gst_audio_iir_filter_set_property(), gst_audio_iir_filter_setup(), gst_audio_iir_filter_signals, PROP_A, PROP_B, and SIGNAL_RATE_CHANGED.