| /* -*- 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., 51 Franklin St, Fifth Floor, |
| * Boston, MA 02110-1301, 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__ */ |