mirror of
https://github.com/mpv-player/mpv
synced 2024-10-30 04:46:41 +01:00
89 lines
3.1 KiB
C
89 lines
3.1 KiB
C
/*
|
|
* Copyright (C) 2001 Anders Johansson ajh@atri.curtin.edu.au
|
|
*
|
|
* This file is part of MPlayer.
|
|
*
|
|
* MPlayer is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* MPlayer 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#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 */
|