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253 lines
7.2 KiB
C
253 lines
7.2 KiB
C
/* -*- c-basic-offset: 2 -*-
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*
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* GStreamer
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* Copyright (C) 1999-2001 Erik Walthinsen <omega@cse.ogi.edu>
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* 2006 Dreamlab Technologies Ltd. <mathis.hofer@dreamlab.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include <math.h>
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#include <gst/gst.h>
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#include <gst/base/gstbasetransform.h>
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#include <gst/controller/gstcontroller.h>
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#include "gstiir.h"
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#define GST_CAT_DEFAULT gst_iir_debug
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GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
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static const GstElementDetails iir_details =
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GST_ELEMENT_DETAILS ("Infinite Impulse Response (IIR) filter",
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"Filter/Effect/Audio",
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"IIR filter based on vorbis code",
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"Monty <monty@xiph.org>, "
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"Thomas Vander Stichele <thomas at apestaart dot org>, "
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"Dreamlab Technologies Ltd. <mathis.hofer@dreamlab.net>");
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/* Filter signals and args */
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enum
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{
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/* FILL ME */
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LAST_SIGNAL
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};
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enum
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{
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PROP_0,
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PROP_A,
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PROP_B,
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PROP_GAIN,
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PROP_STAGES
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};
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static GstStaticPadTemplate iir_sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("audio/x-raw-float, "
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"rate = (int) [ 1, MAX ], "
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"channels = (int) [ 1, MAX ], "
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"endianness = (int) BYTE_ORDER, " "width = (int) 32")
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);
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static GstStaticPadTemplate iir_src_template = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("audio/x-raw-float, "
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"rate = (int) [ 1, MAX ], "
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"channels = (int) [ 1, MAX ], "
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"endianness = (int) BYTE_ORDER, " "width = (int) 32")
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);
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#define DEBUG_INIT(bla) \
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GST_DEBUG_CATEGORY_INIT (gst_iir_debug, "iir", 0, "Infinite Impulse Response (IIR) filter plugin");
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GST_BOILERPLATE_FULL (GstIIR, gst_iir, GstBaseTransform,
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GST_TYPE_BASE_TRANSFORM, DEBUG_INIT);
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static void iir_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void iir_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static GstFlowReturn iir_transform_ip (GstBaseTransform * base,
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GstBuffer * outbuf);
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static gboolean iir_set_caps (GstBaseTransform * base, GstCaps * incaps,
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GstCaps * outcaps);
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/* Element class */
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static void
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gst_iir_dispose (GObject * object)
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{
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G_OBJECT_CLASS (parent_class)->dispose (object);
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}
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static void
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gst_iir_base_init (gpointer g_class)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&iir_src_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&iir_sink_template));
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gst_element_class_set_details (element_class, &iir_details);
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}
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static void
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gst_iir_class_init (GstIIRClass * klass)
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{
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GObjectClass *gobject_class;
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GstBaseTransformClass *trans_class;
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gobject_class = (GObjectClass *) klass;
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trans_class = (GstBaseTransformClass *) klass;
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gobject_class->set_property = iir_set_property;
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gobject_class->get_property = iir_get_property;
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gobject_class->dispose = gst_iir_dispose;
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g_object_class_install_property (gobject_class, PROP_A,
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g_param_spec_double ("A", "A", "A filter coefficient",
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-G_MAXDOUBLE, G_MAXDOUBLE, 0, G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class, PROP_B,
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g_param_spec_double ("B", "B", "B filter coefficient",
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-G_MAXDOUBLE, G_MAXDOUBLE, 0, G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class, PROP_GAIN,
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g_param_spec_double ("gain", "Gain", "Filter gain",
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-G_MAXDOUBLE, G_MAXDOUBLE, 0, G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class, PROP_STAGES,
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g_param_spec_int ("stages", "Stages", "Number of filter stages",
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1, G_MAXINT, 1, G_PARAM_READWRITE));
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trans_class->transform_ip = GST_DEBUG_FUNCPTR (iir_transform_ip);
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trans_class->set_caps = GST_DEBUG_FUNCPTR (iir_set_caps);
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}
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static void
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gst_iir_init (GstIIR * this, GstIIRClass * g_class)
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{
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this->A = 0.0;
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this->B = 0.0;
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this->gain = 1.0; /* unity gain as default */
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this->stages = 1;
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this->state = NULL;
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}
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/* GstBaseTransform vmethod implementations */
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/* get notified of caps and plug in the correct process function */
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static gboolean
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iir_set_caps (GstBaseTransform * base, GstCaps * incaps, GstCaps * outcaps)
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{
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GstIIR *this = GST_IIR (base);
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GST_DEBUG_OBJECT (this,
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"set_caps: in %" GST_PTR_FORMAT " out %" GST_PTR_FORMAT, incaps, outcaps);
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/* FIXME: remember to free it */
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this->state = (IIR_state *) g_malloc (sizeof (IIR_state));
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IIR_init (this->state, this->stages, this->gain, &(this->A), &(this->B));
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return TRUE;
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}
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static GstFlowReturn
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iir_transform_ip (GstBaseTransform * base, GstBuffer * outbuf)
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{
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GstIIR *this = GST_IIR (base);
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GstClockTime timestamp;
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gfloat *src;
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int i;
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/* don't process data in passthrough-mode */
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if (gst_base_transform_is_passthrough (base))
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return GST_FLOW_OK;
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/* FIXME: subdivide GST_BUFFER_SIZE into small chunks for smooth fades */
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timestamp = GST_BUFFER_TIMESTAMP (outbuf);
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if (GST_CLOCK_TIME_IS_VALID (timestamp))
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gst_object_sync_values (G_OBJECT (this), timestamp);
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src = (gfloat *) GST_BUFFER_DATA (outbuf);
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/* do an in-place edit */
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for (i = 0; i < GST_BUFFER_SIZE (outbuf) / sizeof (gfloat); ++i)
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*(src + i) = (gfloat) IIR_filter (this->state, (double) *(src + i));
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return GST_FLOW_OK;
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}
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static void
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iir_set_property (GObject * object, guint prop_id, const GValue * value,
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GParamSpec * pspec)
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{
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GstIIR *this = GST_IIR (object);
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g_return_if_fail (GST_IS_IIR (this));
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switch (prop_id) {
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case PROP_A:
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this->A = g_value_get_double (value);
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break;
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case PROP_B:
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this->B = g_value_get_double (value);
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break;
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case PROP_GAIN:
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this->gain = g_value_get_double (value);
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break;
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case PROP_STAGES:
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this->stages = g_value_get_int (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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iir_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstIIR *this = GST_IIR (object);
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switch (prop_id) {
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case PROP_A:
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g_value_set_double (value, this->A);
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break;
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case PROP_B:
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g_value_set_double (value, this->B);
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break;
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case PROP_GAIN:
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g_value_set_double (value, this->gain);
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break;
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case PROP_STAGES:
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g_value_set_int (value, this->stages);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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