mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-18 15:51:11 +00:00
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.
88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
/* -*- c-basic-offset: 2 -*-
|
|
*
|
|
* GStreamer
|
|
* Copyright (C) 1999-2001 Erik Walthinsen <omega@cse.ogi.edu>
|
|
* 2006 Dreamlab Technologies Ltd. <mathis.hofer@dreamlab.net>
|
|
*
|
|
* 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.
|
|
*
|
|
*
|
|
* this windowed sinc filter is taken from the freely downloadable DSP book,
|
|
* "The Scientist and Engineer's Guide to Digital Signal Processing",
|
|
* chapter 16
|
|
* available at http://www.dspguide.com/
|
|
*
|
|
*/
|
|
|
|
#ifndef __GST_BPWSINC_H__
|
|
#define __GST_BPWSINC_H__
|
|
|
|
#include "gstfilter.h"
|
|
#include <gst/gst.h>
|
|
#include <gst/audio/gstaudiofilter.h>
|
|
|
|
G_BEGIN_DECLS
|
|
|
|
#define GST_TYPE_BPWSINC \
|
|
(gst_bpwsinc_get_type())
|
|
#define GST_BPWSINC(obj) \
|
|
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BPWSINC,GstBPWSinc))
|
|
#define GST_BPWSINC_CLASS(klass) \
|
|
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_BPWSINC,GstBPWSincClass))
|
|
#define GST_IS_BPWSINC(obj) \
|
|
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BPWSINC))
|
|
#define GST_IS_BPWSINC_CLASS(klass) \
|
|
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BPWSINC))
|
|
|
|
typedef struct _GstBPWSinc GstBPWSinc;
|
|
typedef struct _GstBPWSincClass GstBPWSincClass;
|
|
|
|
typedef void (*GstBPWSincProcessFunc) (GstBPWSinc *, guint8 *, guint8 *, guint);
|
|
|
|
/**
|
|
* GstBPWSinc:
|
|
*
|
|
* Opaque data structure.
|
|
*/
|
|
struct _GstBPWSinc {
|
|
GstAudioFilter element;
|
|
|
|
/* < private > */
|
|
GstBPWSincProcessFunc process;
|
|
|
|
gint mode;
|
|
gint window;
|
|
gdouble lower_frequency, upper_frequency;
|
|
gint kernel_length; /* length of the filter kernel */
|
|
|
|
gdouble *residue; /* buffer for left-over samples from previous buffer */
|
|
gdouble *kernel;
|
|
gboolean have_kernel;
|
|
gint residue_length;
|
|
guint64 latency;
|
|
GstClockTime next_ts;
|
|
guint64 next_off;
|
|
};
|
|
|
|
struct _GstBPWSincClass {
|
|
GstAudioFilterClass parent_class;
|
|
};
|
|
|
|
GType gst_bpwsinc_get_type (void);
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __GST_BPWSINC_H__ */
|