mirror of
https://github.com/mpv-player/mpv
synced 2024-12-22 06:42:03 +00:00
0864f92e7a
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@28085 b3059339-0415-0410-9bf9-f77b7e298cf2
79 lines
2.7 KiB
C
79 lines
2.7 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 MPLAYER_DSP_H
|
|
# error Never use filter.h directly; include dsp.h instead.
|
|
#endif
|
|
|
|
#ifndef MPLAYER_FILTER_H
|
|
#define MPLAYER_FILTER_H
|
|
|
|
|
|
// 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
|
|
FLOAT_TYPE af_filter_fir(unsigned int n, const FLOAT_TYPE* w, const FLOAT_TYPE* x);
|
|
|
|
FLOAT_TYPE* af_filter_pfir(unsigned int n, unsigned int k,
|
|
unsigned int xi, const FLOAT_TYPE** w,
|
|
const FLOAT_TYPE** x, FLOAT_TYPE* y,
|
|
unsigned int s);
|
|
|
|
//int af_filter_updateq(unsigned int n, unsigned int xi,
|
|
// FLOAT_TYPE* xq, FLOAT_TYPE* in);
|
|
int af_filter_updatepq(unsigned int n, unsigned int k, unsigned int xi,
|
|
FLOAT_TYPE** xq, const FLOAT_TYPE* in, unsigned int s);
|
|
|
|
int af_filter_design_fir(unsigned int n, FLOAT_TYPE* w, const FLOAT_TYPE* fc,
|
|
unsigned int flags, FLOAT_TYPE opt);
|
|
|
|
int af_filter_design_pfir(unsigned int n, unsigned int k, const FLOAT_TYPE* w,
|
|
FLOAT_TYPE** pw, FLOAT_TYPE g, unsigned int flags);
|
|
|
|
int af_filter_szxform(const FLOAT_TYPE* a, const FLOAT_TYPE* b, FLOAT_TYPE Q,
|
|
FLOAT_TYPE fc, FLOAT_TYPE fs, FLOAT_TYPE *k,
|
|
FLOAT_TYPE *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 /* MPLAYER_FILTER_H */
|