mirror of https://github.com/mpv-player/mpv
80 lines
2.9 KiB
C
80 lines
2.9 KiB
C
/*=============================================================================
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//
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// This software has been released under the terms of the GNU General Public
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// license. See http://www.gnu.org/copyleft/gpl.html for details.
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//
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// Copyright 2001 Anders Johansson ajh@atri.curtin.edu.au
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//
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//=============================================================================
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*/
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#if !defined MPLAYER_DSP_H
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# error Never use filter.h directly; include dsp.h instead.
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#endif
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#ifndef MPLAYER_FILTER_H
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#define MPLAYER_FILTER_H
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// Design and implementation of different types of digital filters
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// Flags used for filter design
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// Filter characteristics
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#define LP 0x00010000 // Low pass
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#define HP 0x00020000 // High pass
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#define BP 0x00040000 // Band pass
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#define BS 0x00080000 // Band stop
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#define TYPE_MASK 0x000F0000
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// Window types
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#define BOXCAR 0x00000001
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#define TRIANG 0x00000002
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#define HAMMING 0x00000004
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#define HANNING 0x00000008
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#define BLACKMAN 0x00000010
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#define FLATTOP 0x00000011
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#define KAISER 0x00000012
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#define WINDOW_MASK 0x0000001F
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// Parallel filter design
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#define FWD 0x00000001 // Forward indexing of polyphase filter
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#define REW 0x00000002 // Reverse indexing of polyphase filter
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#define ODD 0x00000010 // Make filter HP
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// Exported functions
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extern FLOAT_TYPE af_filter_fir(unsigned int n, const FLOAT_TYPE* w, const FLOAT_TYPE* x);
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extern FLOAT_TYPE* af_filter_pfir(unsigned int n, unsigned int k,
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unsigned int xi, const FLOAT_TYPE** w,
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const FLOAT_TYPE** x, FLOAT_TYPE* y,
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unsigned int s);
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//extern int af_filter_updateq(unsigned int n, unsigned int xi,
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// FLOAT_TYPE* xq, FLOAT_TYPE* in);
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extern int af_filter_updatepq(unsigned int n, unsigned int k, unsigned int xi,
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FLOAT_TYPE** xq, const FLOAT_TYPE* in, unsigned int s);
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extern int af_filter_design_fir(unsigned int n, FLOAT_TYPE* w, const FLOAT_TYPE* fc,
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unsigned int flags, FLOAT_TYPE opt);
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extern int af_filter_design_pfir(unsigned int n, unsigned int k, const FLOAT_TYPE* w,
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FLOAT_TYPE** pw, FLOAT_TYPE g,
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unsigned int flags);
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extern int af_filter_szxform(const FLOAT_TYPE* a, const FLOAT_TYPE* b, FLOAT_TYPE Q,
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FLOAT_TYPE fc, FLOAT_TYPE fs, FLOAT_TYPE *k,
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FLOAT_TYPE *coef);
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/* Add new data to circular queue designed to be used with a FIR
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filter. xq is the circular queue, in pointing at the new sample, xi
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current index for xq and n the length of the filter. xq must be n*2
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long.
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*/
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#define af_filter_updateq(n,xi,xq,in)\
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xq[xi]=(xq)[(xi)+(n)]=*(in);\
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xi=(++(xi))&((n)-1);
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#endif /* MPLAYER_FILTER_H */
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