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libavcodec/iirfilter.h

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00001 /*
00002  * IIR filter
00003  * Copyright (c) 2008 Konstantin Shishkov
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00027 #ifndef AVCODEC_IIRFILTER_H
00028 #define AVCODEC_IIRFILTER_H
00029 
00030 #include "avcodec.h"
00031 
00032 struct FFIIRFilterCoeffs;
00033 struct FFIIRFilterState;
00034 
00035 enum IIRFilterType{
00036     FF_FILTER_TYPE_BESSEL,
00037     FF_FILTER_TYPE_BUTTERWORTH,
00038     FF_FILTER_TYPE_CHEBYSHEV,
00039     FF_FILTER_TYPE_ELLIPTIC,
00040 };
00041 
00042 enum IIRFilterMode{
00043     FF_FILTER_MODE_LOWPASS,
00044     FF_FILTER_MODE_HIGHPASS,
00045     FF_FILTER_MODE_BANDPASS,
00046     FF_FILTER_MODE_BANDSTOP,
00047 };
00048 
00061 struct FFIIRFilterCoeffs* ff_iir_filter_init_coeffs(enum IIRFilterType filt_type,
00062                                                     enum IIRFilterMode filt_mode,
00063                                                     int order, float cutoff_ratio,
00064                                                     float stopband, float ripple);
00065 
00073 struct FFIIRFilterState* ff_iir_filter_init_state(int order);
00074 
00080 void ff_iir_filter_free_coeffs(struct FFIIRFilterCoeffs *coeffs);
00081 
00087 void ff_iir_filter_free_state(struct FFIIRFilterState *state);
00088 
00100 void ff_iir_filter(const struct FFIIRFilterCoeffs *coeffs, struct FFIIRFilterState *state,
00101                    int size, const int16_t *src, int sstep, int16_t *dst, int dstep);
00102 
00103 #endif /* AVCODEC_IIRFILTER_H */

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