mirror of
https://github.com/mpv-player/mpv
synced 2024-12-23 23:32:26 +00:00
77456b04d9
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@14276 b3059339-0415-0410-9bf9-f77b7e298cf2
70 lines
2.4 KiB
C
70 lines
2.4 KiB
C
/*=============================================================================
|
|
//
|
|
// This software has been released under the terms of the GNU General Public
|
|
// license. See http://www.gnu.org/copyleft/gpl.html for details.
|
|
//
|
|
// Copyright 2001 Anders Johansson ajh@atri.curtin.edu.au
|
|
//
|
|
//=============================================================================
|
|
*/
|
|
|
|
#if !defined _DSP_H
|
|
# error "Never use <filter.h> directly; include <dsp.h> instead"
|
|
#endif
|
|
|
|
#ifndef _FILTER_H
|
|
#define _FILTER_H 1
|
|
|
|
|
|
// Design and implementation of different types of digital filters
|
|
|
|
|
|
// Flags used for filter design
|
|
|
|
// Filter characteristics
|
|
#define LP 0x00010000 // Low pass
|
|
#define HP 0x00020000 // High pass
|
|
#define BP 0x00040000 // Band pass
|
|
#define BS 0x00080000 // Band stop
|
|
#define TYPE_MASK 0x000F0000
|
|
|
|
// Window types
|
|
#define BOXCAR 0x00000001
|
|
#define TRIANG 0x00000002
|
|
#define HAMMING 0x00000004
|
|
#define HANNING 0x00000008
|
|
#define BLACKMAN 0x00000010
|
|
#define FLATTOP 0x00000011
|
|
#define KAISER 0x00000012
|
|
#define WINDOW_MASK 0x0000001F
|
|
|
|
// Parallel filter design
|
|
#define FWD 0x00000001 // Forward indexing of polyphase filter
|
|
#define REW 0x00000002 // Reverse indexing of polyphase filter
|
|
#define ODD 0x00000010 // Make filter HP
|
|
|
|
// Exported functions
|
|
extern _ftype_t af_filter_fir(unsigned int n, _ftype_t* w, _ftype_t* x);
|
|
|
|
extern _ftype_t* af_filter_pfir(unsigned int n, unsigned int k, unsigned int xi, _ftype_t** w, _ftype_t** x, _ftype_t* y, unsigned int s);
|
|
|
|
//extern int af_filter_updateq(unsigned int n, unsigned int xi, _ftype_t* xq, _ftype_t* in);
|
|
extern int af_filter_updatepq(unsigned int n, unsigned int k, unsigned int xi, _ftype_t** xq, _ftype_t* in, unsigned int s);
|
|
|
|
extern int af_filter_design_fir(unsigned int n, _ftype_t* w, _ftype_t* fc, unsigned int flags, _ftype_t opt);
|
|
|
|
extern int af_filter_design_pfir(unsigned int n, unsigned int k, _ftype_t* w, _ftype_t** pw, _ftype_t g, unsigned int flags);
|
|
|
|
extern int af_filter_szxform(_ftype_t* a, _ftype_t* b, _ftype_t Q, _ftype_t fc, _ftype_t fs, _ftype_t *k, _ftype_t *coef);
|
|
|
|
/* Add new data to circular queue designed to be used with a FIR
|
|
filter. xq is the circular queue, in pointing at the new sample, xi
|
|
current index for xq and n the length of the filter. xq must be n*2
|
|
long.
|
|
*/
|
|
#define af_filter_updateq(n,xi,xq,in)\
|
|
xq[xi]=(xq)[(xi)+(n)]=*(in);\
|
|
xi=(++(xi))&((n)-1);
|
|
|
|
#endif
|