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/* -*- c-basic-offset: 2 -*-
*
* GStreamer
* Copyright (C) 1999-2001 Erik Walthinsen <omega@cse.ogi.edu>
* 2006 Dreamlab Technologies Ltd. <mathis.hofer@dreamlab.net>
* 2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* 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.
*
*/
#ifndef __GST_AUDIO_FX_BASE_FIR_FILTER_H__
#define __GST_AUDIO_FX_BASE_FIR_FILTER_H__
#include <gst/gst.h>
#include <gst/audio/gstaudiofilter.h>
#include <gst/fft/gstfftf64.h>
G_BEGIN_DECLS
#define GST_TYPE_AUDIO_FX_BASE_FIR_FILTER \
(gst_audio_fx_base_fir_filter_get_type())
#define GST_AUDIO_FX_BASE_FIR_FILTER(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_FX_BASE_FIR_FILTER,GstAudioFXBaseFIRFilter))
#define GST_AUDIO_FX_BASE_FIR_FILTER_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_AUDIO_FX_BASE_FIR_FILTER,GstAudioFXBaseFIRFilterClass))
#define GST_IS_AUDIO_FX_BASE_FIR_FILTER(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_FX_BASE_FIR_FILTER))
#define GST_IS_AUDIO_FX_BASE_FIR_FILTER_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AUDIO_FX_BASE_FIR_FILTER))
typedef struct _GstAudioFXBaseFIRFilter GstAudioFXBaseFIRFilter;
typedef struct _GstAudioFXBaseFIRFilterClass GstAudioFXBaseFIRFilterClass;
typedef guint (*GstAudioFXBaseFIRFilterProcessFunc) (GstAudioFXBaseFIRFilter *, const guint8 *, guint8 *, guint);
/**
* GstAudioFXBaseFIRFilter:
*
* Opaque data structure.
*/
struct _GstAudioFXBaseFIRFilter {
GstAudioFilter element;
/* properties */
gdouble *kernel; /* filter kernel -- time domain */
guint kernel_length; /* length of the filter kernel -- time domain */
guint64 latency; /* pre-latency of the filter kernel */
gboolean low_latency; /* work in slower low latency mode */
gboolean drain_on_changes; /* If the filter should be drained when
* coeficients change */
/* < private > */
GstAudioFXBaseFIRFilterProcessFunc process;
gdouble *buffer; /* buffer for storing samples of previous buffers */
guint buffer_fill; /* fill level of buffer */
guint buffer_length; /* length of the buffer -- meaning depends on processing mode */
/* FFT convolution specific data */
GstFFTF64 *fft;
GstFFTF64 *ifft;
GstFFTF64Complex *frequency_response; /* filter kernel -- frequency domain */
guint frequency_response_length; /* length of filter kernel -- frequency domain */
GstFFTF64Complex *fft_buffer; /* FFT buffer, has the length of the frequency response */
guint block_length; /* Length of the processing blocks -- time domain */
GstClockTime start_ts; /* start timestamp after a discont */
guint64 start_off; /* start offset after a discont */
guint64 nsamples_out; /* number of output samples since last discont */
guint64 nsamples_in; /* number of input samples since last discont */
GMutex lock;
};
struct _GstAudioFXBaseFIRFilterClass {
GstAudioFilterClass parent_class;
};
GType gst_audio_fx_base_fir_filter_get_type (void);
void gst_audio_fx_base_fir_filter_set_kernel (GstAudioFXBaseFIRFilter *filter, gdouble *kernel,
guint kernel_length, guint64 latency, const GstAudioInfo * info);
void gst_audio_fx_base_fir_filter_push_residue (GstAudioFXBaseFIRFilter *filter);
G_END_DECLS
#endif /* __GST_AUDIO_FX_BASE_FIR_FILTER_H__ */