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fc8a487616
Original commit message from CVS: * gst/filter/gstbpwsinc.c: (gst_bpwsinc_class_init), (gst_bpwsinc_init), (process_32), (process_64), (bpwsinc_build_kernel), (bpwsinc_push_residue), (bpwsinc_transform), (bpwsinc_start), (bpwsinc_query), (bpwsinc_query_type), (bpwsinc_event), (bpwsinc_set_property): * gst/filter/gstbpwsinc.h: Implement latency query and only forward those samples downstream that actually contain the data we want, i.e. drop kernel_length/2 in the beginning and append kernel_length/2 (created by convolving the filter kernel with zeroes) to the end. * tests/check/elements/bpwsinc.c: (GST_START_TEST): Adjust the unit test for this slightly changed behaviour. * gst/filter/gstlpwsinc.c: (lpwsinc_build_kernel): Reset residue length only when actually creating a residue.
89 lines
2.5 KiB
C
89 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_BPWSINC_H__
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#define __GST_BPWSINC_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_BPWSINC \
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(gst_bpwsinc_get_type())
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#define GST_BPWSINC(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BPWSINC,GstBPWSinc))
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#define GST_BPWSINC_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_BPWSINC,GstBPWSincClass))
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#define GST_IS_BPWSINC(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BPWSINC))
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#define GST_IS_BPWSINC_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BPWSINC))
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typedef struct _GstBPWSinc GstBPWSinc;
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typedef struct _GstBPWSincClass GstBPWSincClass;
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typedef void (*GstBPWSincProcessFunc) (GstBPWSinc *, guint8 *, guint8 *, guint);
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/**
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* GstBPWSinc:
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*
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* Opaque data structure.
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*/
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struct _GstBPWSinc {
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GstAudioFilter element;
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/* < private > */
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GstBPWSincProcessFunc process;
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gint mode;
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gint window;
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gdouble lower_frequency, upper_frequency;
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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;
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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 _GstBPWSincClass {
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GstAudioFilterClass parent_class;
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};
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GType gst_bpwsinc_get_type (void);
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G_END_DECLS
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#endif /* __GST_BPWSINC_H__ */
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