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| 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 |
| 40 spx_word16_t compute_rms(const spx_sig_t *x, int len); |
| 41 spx_word16_t compute_rms16(const spx_word16_t *x, int len); |
| 42 void signal_mul(const spx_sig_t *x, spx_sig_t *y, spx_word32_t scale, int len); |
| 43 void signal_div(const spx_word16_t *x, spx_word16_t *y, spx_word32_t scale, int
len); |
| 44 |
| 45 #ifdef FIXED_POINT |
| 46 |
| 47 int normalize16(const spx_sig_t *x, spx_word16_t *y, spx_sig_t max_scale, int le
n); |
| 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 |
| 58 void highpass(const spx_word16_t *x, spx_word16_t *y, int len, int filtID, spx_m
em_t *mem); |
| 59 |
| 60 |
| 61 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); |
| 62 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, cha
r *stack); |
| 63 |
| 64 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); |
| 65 void iir_mem16(const spx_word16_t *x, const spx_coef_t *den, spx_word16_t *y, in
t N, int ord, spx_mem_t *mem, char *stack); |
| 66 void fir_mem16(const spx_word16_t *x, const spx_coef_t *num, spx_word16_t *y, in
t N, int ord, spx_mem_t *mem, char *stack); |
| 67 |
| 68 /* Apply bandwidth expansion on LPC coef */ |
| 69 void bw_lpc(spx_word16_t , const spx_coef_t *lpc_in, spx_coef_t *lpc_out, int or
der); |
| 70 void sanitize_values32(spx_word32_t *vec, spx_word32_t min_val, spx_word32_t max
_val, int len); |
| 71 |
| 72 |
| 73 void syn_percep_zero16(const spx_word16_t *xx, const spx_coef_t *ak, const spx_c
oef_t *awk1, const spx_coef_t *awk2, spx_word16_t *y, int N, int ord, char *stac
k); |
| 74 void residue_percep_zero16(const spx_word16_t *xx, const spx_coef_t *ak, const s
px_coef_t *awk1, const spx_coef_t *awk2, spx_word16_t *y, int N, int ord, char *
stack); |
| 75 |
| 76 void compute_impulse_response(const spx_coef_t *ak, const spx_coef_t *awk1, cons
t spx_coef_t *awk2, spx_word16_t *y, int N, int ord, char *stack); |
| 77 |
| 78 void multicomb( |
| 79 spx_word16_t *exc, /*decoded excitation*/ |
| 80 spx_word16_t *new_exc, /*enhanced excitation*/ |
| 81 spx_coef_t *ak, /*LPC filter coefs*/ |
| 82 int p, /*LPC order*/ |
| 83 int nsf, /*sub-frame size*/ |
| 84 int pitch, /*pitch period*/ |
| 85 int max_pitch, /*pitch gain (3-tap)*/ |
| 86 spx_word16_t comb_gain, /*gain of comb filter*/ |
| 87 char *stack |
| 88 ); |
| 89 |
| 90 #endif |
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