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91 lines
4 KiB
C
91 lines
4 KiB
C
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/* Copyright (C) 2002 Jean-Marc Valin */
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/**
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@file filters.h
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@brief Various analysis/synthesis filters
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*/
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/*
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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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#include "arch.h"
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spx_word16_t compute_rms(const spx_sig_t *x, int len);
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spx_word16_t compute_rms16(const spx_word16_t *x, int len);
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void signal_mul(const spx_sig_t *x, spx_sig_t *y, spx_word32_t scale, int len);
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void signal_div(const spx_word16_t *x, spx_word16_t *y, spx_word32_t scale, int len);
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#ifdef FIXED_POINT
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int normalize16(const spx_sig_t *x, spx_word16_t *y, spx_sig_t max_scale, int len);
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#endif
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#define HIGHPASS_NARROWBAND 0
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#define HIGHPASS_WIDEBAND 2
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#define HIGHPASS_INPUT 0
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#define HIGHPASS_OUTPUT 1
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#define HIGHPASS_IRS 4
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void highpass(const spx_word16_t *x, spx_word16_t *y, int len, int filtID, spx_mem_t *mem);
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void qmf_decomp(const spx_word16_t *xx, const spx_word16_t *aa, spx_word16_t *, spx_word16_t *y2, int N, int M, spx_word16_t *mem, char *stack);
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void qmf_synth(const spx_word16_t *x1, const spx_word16_t *x2, const spx_word16_t *a, spx_word16_t *y, int N, int M, spx_word16_t *mem1, spx_word16_t *mem2, char *stack);
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void filter_mem16(const spx_word16_t *x, const spx_coef_t *num, const spx_coef_t *den, spx_word16_t *y, int N, int ord, spx_mem_t *mem, char *stack);
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void iir_mem16(const spx_word16_t *x, const spx_coef_t *den, spx_word16_t *y, int N, int ord, spx_mem_t *mem, char *stack);
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void fir_mem16(const spx_word16_t *x, const spx_coef_t *num, spx_word16_t *y, int N, int ord, spx_mem_t *mem, char *stack);
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/* Apply bandwidth expansion on LPC coef */
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void bw_lpc(spx_word16_t , const spx_coef_t *lpc_in, spx_coef_t *lpc_out, int order);
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void sanitize_values32(spx_word32_t *vec, spx_word32_t min_val, spx_word32_t max_val, int len);
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void syn_percep_zero16(const spx_word16_t *xx, const spx_coef_t *ak, const spx_coef_t *awk1, const spx_coef_t *awk2, spx_word16_t *y, int N, int ord, char *stack);
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void residue_percep_zero16(const spx_word16_t *xx, const spx_coef_t *ak, const spx_coef_t *awk1, const spx_coef_t *awk2, spx_word16_t *y, int N, int ord, char *stack);
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void compute_impulse_response(const spx_coef_t *ak, const spx_coef_t *awk1, const spx_coef_t *awk2, spx_word16_t *y, int N, int ord, char *stack);
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void multicomb(
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spx_word16_t *exc, /*decoded excitation*/
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spx_word16_t *new_exc, /*enhanced excitation*/
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spx_coef_t *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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int max_pitch, /*pitch gain (3-tap)*/
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spx_word16_t comb_gain, /*gain of comb filter*/
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char *stack
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);
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#endif
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