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Member "gst-plugins-good-1.20.3/gst/audiofx/audiofxbasefirfilter.h" (15 Jun 2022, 4209 Bytes) of package /linux/misc/gst-plugins-good-1.20.3.tar.xz:


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    1 /* -*- c-basic-offset: 2 -*-
    2  * 
    3  * GStreamer
    4  * Copyright (C) 1999-2001 Erik Walthinsen <omega@cse.ogi.edu>
    5  *               2006 Dreamlab Technologies Ltd. <mathis.hofer@dreamlab.net>
    6  *               2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
    7  *
    8  * This library is free software; you can redistribute it and/or
    9  * modify it under the terms of the GNU Library General Public
   10  * License as published by the Free Software Foundation; either
   11  * version 2 of the License, or (at your option) any later version.
   12  *
   13  * This library is distributed in the hope that it will be useful,
   14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   16  * Library General Public License for more details.
   17  *
   18  * You should have received a copy of the GNU Library General Public
   19  * License along with this library; if not, write to the
   20  * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
   21  * Boston, MA 02110-1301, USA.
   22  * 
   23  */
   24 
   25 #ifndef __GST_AUDIO_FX_BASE_FIR_FILTER_H__
   26 #define __GST_AUDIO_FX_BASE_FIR_FILTER_H__
   27 
   28 #include <gst/gst.h>
   29 #include <gst/audio/gstaudiofilter.h>
   30 #include <gst/fft/gstfftf64.h>
   31 
   32 G_BEGIN_DECLS
   33 
   34 #define GST_TYPE_AUDIO_FX_BASE_FIR_FILTER \
   35   (gst_audio_fx_base_fir_filter_get_type())
   36 #define GST_AUDIO_FX_BASE_FIR_FILTER(obj) \
   37   (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_FX_BASE_FIR_FILTER,GstAudioFXBaseFIRFilter))
   38 #define GST_AUDIO_FX_BASE_FIR_FILTER_CLASS(klass) \
   39   (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_AUDIO_FX_BASE_FIR_FILTER,GstAudioFXBaseFIRFilterClass))
   40 #define GST_IS_AUDIO_FX_BASE_FIR_FILTER(obj) \
   41   (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_FX_BASE_FIR_FILTER))
   42 #define GST_IS_AUDIO_FX_BASE_FIR_FILTER_CLASS(klass) \
   43   (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AUDIO_FX_BASE_FIR_FILTER))
   44 
   45 typedef struct _GstAudioFXBaseFIRFilter GstAudioFXBaseFIRFilter;
   46 typedef struct _GstAudioFXBaseFIRFilterClass GstAudioFXBaseFIRFilterClass;
   47 
   48 typedef guint (*GstAudioFXBaseFIRFilterProcessFunc) (GstAudioFXBaseFIRFilter *, const guint8 *, guint8 *, guint);
   49 
   50 /**
   51  * GstAudioFXBaseFIRFilter:
   52  *
   53  * Opaque data structure.
   54  */
   55 struct _GstAudioFXBaseFIRFilter {
   56   GstAudioFilter element;
   57 
   58   /* properties */
   59   gdouble *kernel;              /* filter kernel -- time domain */
   60   guint kernel_length;          /* length of the filter kernel -- time domain */
   61 
   62   guint64 latency;              /* pre-latency of the filter kernel */
   63   gboolean low_latency;         /* work in slower low latency mode */
   64 
   65   gboolean drain_on_changes;    /* If the filter should be drained when
   66                                  * coefficients change */
   67 
   68   /* < private > */
   69   GstAudioFXBaseFIRFilterProcessFunc process;
   70 
   71   gdouble *buffer;              /* buffer for storing samples of previous buffers */
   72   guint buffer_fill;            /* fill level of buffer */
   73   guint buffer_length;          /* length of the buffer -- meaning depends on processing mode */
   74 
   75   /* FFT convolution specific data */
   76   GstFFTF64 *fft;
   77   GstFFTF64 *ifft;
   78   GstFFTF64Complex *frequency_response;  /* filter kernel -- frequency domain */
   79   guint frequency_response_length;       /* length of filter kernel -- frequency domain */
   80   GstFFTF64Complex *fft_buffer;          /* FFT buffer, has the length of the frequency response */
   81   guint block_length;                    /* Length of the processing blocks -- time domain */
   82 
   83   GstClockTime start_ts;        /* start timestamp after a discont */
   84   guint64 start_off;            /* start offset after a discont */
   85   guint64 nsamples_out;         /* number of output samples since last discont */
   86   guint64 nsamples_in;          /* number of input samples since last discont */
   87 
   88   GMutex lock;
   89 };
   90 
   91 struct _GstAudioFXBaseFIRFilterClass {
   92   GstAudioFilterClass parent_class;
   93 };
   94 
   95 GType gst_audio_fx_base_fir_filter_get_type (void);
   96 void gst_audio_fx_base_fir_filter_set_kernel (GstAudioFXBaseFIRFilter *filter, gdouble *kernel,
   97                                               guint kernel_length, guint64 latency, const GstAudioInfo * info);
   98 void gst_audio_fx_base_fir_filter_push_residue (GstAudioFXBaseFIRFilter *filter);
   99 
  100 G_END_DECLS
  101 
  102 #endif /* __GST_AUDIO_FX_BASE_FIR_FILTER_H__ */