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1301d15e4f
Original commit message from CVS: * gst/filter/gstbpwsinc.c: (gst_bpwsinc_class_init), (bpwsinc_set_property), (bpwsinc_get_property): * gst/filter/gstbpwsinc.h: * gst/filter/gstlpwsinc.c: (gst_lpwsinc_class_init), (gst_lpwsinc_init), (lpwsinc_build_kernel), (lpwsinc_set_property), (lpwsinc_get_property): * gst/filter/gstlpwsinc.h: * tests/check/elements/lpwsinc.c: (GST_START_TEST): Use generator macros for the process functions for the different sample types, add lower upper boundaries for the GObject properties so automatically generated UIs can use sliders and change frequency properties to floats to save a bit of memory, even ints would in theory be enough. Also rename frequency to cutoff for consistency reasons. * docs/plugins/gst-plugins-bad-plugins.args: * docs/plugins/gst-plugins-bad-plugins.signals: * docs/plugins/inspect/plugin-gstrtpmanager.xml: Regenerated for the above changes.
88 lines
2.5 KiB
C
88 lines
2.5 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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*
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* this windowed sinc filter is taken from the freely downloadable DSP book,
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* "The Scientist and Engineer's Guide to Digital Signal Processing",
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* chapter 16
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* available at http://www.dspguide.com/
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*
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*/
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#ifndef __GST_LPWSINC_H__
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#define __GST_LPWSINC_H__
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#include "gstfilter.h"
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#include <gst/gst.h>
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#include <gst/audio/gstaudiofilter.h>
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G_BEGIN_DECLS
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#define GST_TYPE_LPWSINC \
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(gst_lpwsinc_get_type())
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#define GST_LPWSINC(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_LPWSINC,GstLPWSinc))
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#define GST_LPWSINC_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_LPWSINC,GstLPWSincClass))
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#define GST_IS_LPWSINC(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_LPWSINC))
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#define GST_IS_LPWSINC_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_LPWSINC))
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typedef struct _GstLPWSinc GstLPWSinc;
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typedef struct _GstLPWSincClass GstLPWSincClass;
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typedef void (*GstLPWSincProcessFunc) (GstLPWSinc *, guint8 *, guint8 *, guint);
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/**
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* GstLPWSinc:
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*
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* Opaque data structure.
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*/
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struct _GstLPWSinc {
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GstAudioFilter element;
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/* < private > */
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GstLPWSincProcessFunc process;
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gint mode;
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gint window;
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gfloat cutoff;
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gint kernel_length; /* length of the filter kernel */
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gdouble *residue; /* buffer for left-over samples from previous buffer */
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gdouble *kernel; /* filter kernel */
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gboolean have_kernel;
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gint residue_length;
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guint64 latency;
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GstClockTime next_ts;
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guint64 next_off;
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};
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struct _GstLPWSincClass {
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GstAudioFilterClass parent_class;
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};
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GType gst_lpwsinc_get_type (void);
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G_END_DECLS
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#endif /* __GST_LPWSINC_H__ */
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