1/* Copyright (C) 2002 Jean-Marc Valin */
2/**
3   @file filters.h
4   @brief Various analysis/synthesis filters
5*/
6/*
7   Redistribution and use in source and binary forms, with or without
8   modification, are permitted provided that the following conditions
9   are met:
10
11   - Redistributions of source code must retain the above copyright
12   notice, this list of conditions and the following disclaimer.
13
14   - Redistributions in binary form must reproduce the above copyright
15   notice, this list of conditions and the following disclaimer in the
16   documentation and/or other materials provided with the distribution.
17
18   - Neither the name of the Xiph.org Foundation nor the names of its
19   contributors may be used to endorse or promote products derived from
20   this software without specific prior written permission.
21
22   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
25   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
26   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
27   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
28   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
29   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
30   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
31   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
32   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33*/
34
35#ifndef FILTERS_H
36#define FILTERS_H
37
38#include "arch.h"
39
40spx_word16_t compute_rms(const spx_sig_t *x, int len);
41spx_word16_t compute_rms16(const spx_word16_t *x, int len);
42void signal_mul(const spx_sig_t *x, spx_sig_t *y, spx_word32_t scale, int len);
43void signal_div(const spx_word16_t *x, spx_word16_t *y, spx_word32_t scale, int len);
44
45#ifdef FIXED_POINT
46
47int normalize16(const spx_sig_t *x, spx_word16_t *y, spx_sig_t max_scale, int len);
48
49#endif
50
51
52#define HIGHPASS_NARROWBAND 0
53#define HIGHPASS_WIDEBAND 2
54#define HIGHPASS_INPUT 0
55#define HIGHPASS_OUTPUT 1
56#define HIGHPASS_IRS 4
57
58void highpass(const spx_word16_t *x, spx_word16_t *y, int len, int filtID, spx_mem_t *mem);
59
60
61void 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);
62void 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);
63
64void 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);
65void 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);
66void 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);
67
68/* Apply bandwidth expansion on LPC coef */
69void bw_lpc(spx_word16_t , const spx_coef_t *lpc_in, spx_coef_t *lpc_out, int order);
70void sanitize_values32(spx_word32_t *vec, spx_word32_t min_val, spx_word32_t max_val, int len);
71
72
73void 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);
74void 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);
75
76void 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);
77
78void multicomb(
79spx_word16_t *exc,          /*decoded excitation*/
80spx_word16_t *new_exc,      /*enhanced excitation*/
81spx_coef_t *ak,           /*LPC filter coefs*/
82int p,               /*LPC order*/
83int nsf,             /*sub-frame size*/
84int pitch,           /*pitch period*/
85int max_pitch,   /*pitch gain (3-tap)*/
86spx_word16_t  comb_gain,    /*gain of comb filter*/
87char *stack
88);
89
90#endif
91