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author | anders <anders@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2002-10-01 06:45:08 +0000 |
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committer | anders <anders@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2002-10-01 06:45:08 +0000 |
commit | 1f6c494641c4ca99eec7a9f47818526c72789439 (patch) | |
tree | 17bf220c1c1ac1144dfa8212f09444e51c248a26 /libaf/filter.h | |
parent | c0091278d8f15580eecebfc8c454fba250cf4b94 (diff) | |
download | mpv-1f6c494641c4ca99eec7a9f47818526c72789439.tar.bz2 mpv-1f6c494641c4ca99eec7a9f47818526c72789439.tar.xz |
Adding new audio output filter layer libaf
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@7569 b3059339-0415-0410-9bf9-f77b7e298cf2
Diffstat (limited to 'libaf/filter.h')
-rw-r--r-- | libaf/filter.h | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/libaf/filter.h b/libaf/filter.h new file mode 100644 index 0000000000..f36bc0bf2f --- /dev/null +++ b/libaf/filter.h @@ -0,0 +1,65 @@ +/*============================================================================= +// +// This software has been released under the terms of the GNU 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 fir(unsigned int n, _ftype_t* w, _ftype_t* x); +extern _ftype_t* pfir(unsigned int n, unsigned int k, unsigned int xi, _ftype_t** w, _ftype_t** x, _ftype_t* y, unsigned int s); + +extern int updateq(unsigned int n, unsigned int xi, _ftype_t* xq, _ftype_t* in); +extern int updatepq(unsigned int n, unsigned int k, unsigned int xi, _ftype_t** xq, _ftype_t* in, unsigned int s); + +extern int design_fir(unsigned int n, _ftype_t* w, _ftype_t* fc, unsigned int flags, _ftype_t opt); +extern int design_pfir(unsigned int n, unsigned int k, _ftype_t* w, _ftype_t** pw, _ftype_t g, unsigned int flags); + +/* 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 updateq(n,xi,xq,in)\ + xq[xi]=xq[xi+n]=*in;\ + xi=(++xi)&(n-1); + +#endif |