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79 lines
3.1 KiB
79 lines
3.1 KiB
/* Copyright (C) 2002 Jean-Marc Valin |
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File: filters.h |
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Various analysis/synthesis filters |
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Redistribution and use in source and binary forms, with or without |
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modification, are permitted provided that the following conditions |
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are met: |
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- Redistributions of source code must retain the above copyright |
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notice, this list of conditions and the following disclaimer. |
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- Redistributions in binary form must reproduce the above copyright |
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notice, this list of conditions and the following disclaimer in the |
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documentation and/or other materials provided with the distribution. |
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- Neither the name of the Xiph.org Foundation nor the names of its |
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contributors may be used to endorse or promote products derived from |
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this software without specific prior written permission. |
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR |
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#ifndef FILTERS_H |
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#define FILTERS_H |
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typedef struct CombFilterMem { |
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int last_pitch; |
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float last_pitch_gain[3]; |
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float smooth_gain; |
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} CombFilterMem; |
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void qmf_decomp(float *xx, float *aa, float *y1, float *y2, int N, int M, float *mem, char *stack); |
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void fir_mem_up(float *x, float *a, float *y, int N, int M, float *mem, char *stack); |
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void filter_mem2(float *x, float *num, float *den, float *y, int N, int ord, float *mem); |
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void fir_mem2(float *x, float *num, float *y, int N, int ord, float *mem); |
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void iir_mem2(float *x, float *den, float *y, int N, int ord, float *mem); |
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/* Apply bandwidth expansion on LPC coef */ |
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void bw_lpc(float gamma, float *lpc_in, float *lpc_out, int order); |
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/* FIR filter */ |
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void fir_decim_mem(float *x, float *a, float *y, int N, int M, float *mem); |
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void syn_percep_zero(float *x, float *ak, float *awk1, float *awk2, float *y, int N, int ord, char *stack); |
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void residue_percep_zero(float *xx, float *ak, float *awk1, float *awk2, float *y, int N, int ord, char *stack); |
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void comp_filter_mem_init (CombFilterMem *mem); |
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void comb_filter( |
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float *exc, /*decoded excitation*/ |
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float *new_exc, /*enhanced excitation*/ |
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float *ak, /*LPC filter coefs*/ |
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int p, /*LPC order*/ |
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int nsf, /*sub-frame size*/ |
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int pitch, /*pitch period*/ |
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float *pitch_gain, /*pitch gain (3-tap)*/ |
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float comb_gain, /*gain of comb filter*/ |
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CombFilterMem *mem |
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); |
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#endif
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