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a9a5e0c7e1
Currently this only works if the kernel size doesn't change, in the future it will be possible to change the kernel size too without draining the complete history and without loosing anything. Partially based on a patch by Thiago Santos <thiago.sousa.santos@collabora.co.uk>
100 lines
4 KiB
C
100 lines
4 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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* 2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
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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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#ifndef __GST_AUDIO_FX_BASE_FIR_FILTER_H__
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#define __GST_AUDIO_FX_BASE_FIR_FILTER_H__
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#include <gst/gst.h>
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#include <gst/audio/gstaudiofilter.h>
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#include <gst/fft/gstfftf64.h>
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G_BEGIN_DECLS
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#define GST_TYPE_AUDIO_FX_BASE_FIR_FILTER \
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(gst_audio_fx_base_fir_filter_get_type())
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#define GST_AUDIO_FX_BASE_FIR_FILTER(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_FX_BASE_FIR_FILTER,GstAudioFXBaseFIRFilter))
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#define GST_AUDIO_FX_BASE_FIR_FILTER_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_AUDIO_FX_BASE_FIR_FILTER,GstAudioFXBaseFIRFilterClass))
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#define GST_IS_AUDIO_FX_BASE_FIR_FILTER(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_FX_BASE_FIR_FILTER))
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#define GST_IS_AUDIO_FX_BASE_FIR_FILTER_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AUDIO_FX_BASE_FIR_FILTER))
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typedef struct _GstAudioFXBaseFIRFilter GstAudioFXBaseFIRFilter;
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typedef struct _GstAudioFXBaseFIRFilterClass GstAudioFXBaseFIRFilterClass;
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typedef guint (*GstAudioFXBaseFIRFilterProcessFunc) (GstAudioFXBaseFIRFilter *, const guint8 *, guint8 *, guint);
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/**
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* GstAudioFXBaseFIRFilter:
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*
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* Opaque data structure.
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*/
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struct _GstAudioFXBaseFIRFilter {
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GstAudioFilter element;
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/* properties */
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gdouble *kernel; /* filter kernel -- time domain */
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guint kernel_length; /* length of the filter kernel -- time domain */
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guint64 latency; /* pre-latency of the filter kernel */
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gboolean low_latency; /* work in slower low latency mode */
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gboolean drain_on_changes; /* If the filter should be drained when
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* coeficients change */
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/* < private > */
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GstAudioFXBaseFIRFilterProcessFunc process;
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gdouble *buffer; /* buffer for storing samples of previous buffers */
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guint buffer_fill; /* fill level of buffer */
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guint buffer_length; /* length of the buffer -- meaning depends on processing mode */
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/* FFT convolution specific data */
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GstFFTF64 *fft;
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GstFFTF64 *ifft;
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GstFFTF64Complex *frequency_response; /* filter kernel -- frequency domain */
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guint frequency_response_length; /* length of filter kernel -- frequency domain */
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GstFFTF64Complex *fft_buffer; /* FFT buffer, has the length of the frequency response */
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guint block_length; /* Length of the processing blocks -- time domain */
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GstClockTime start_ts; /* start timestamp after a discont */
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guint64 start_off; /* start offset after a discont */
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guint64 nsamples_out; /* number of output samples since last discont */
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guint64 nsamples_in; /* number of input samples since last discont */
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};
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struct _GstAudioFXBaseFIRFilterClass {
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GstAudioFilterClass parent_class;
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};
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GType gst_audio_fx_base_fir_filter_get_type (void);
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void gst_audio_fx_base_fir_filter_set_kernel (GstAudioFXBaseFIRFilter *filter, gdouble *kernel, guint kernel_length, guint64 latency);
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void gst_audio_fx_base_fir_filter_push_residue (GstAudioFXBaseFIRFilter *filter);
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G_END_DECLS
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#endif /* __GST_AUDIO_FX_BASE_FIR_FILTER_H__ */
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