| /* Copyright (C) 2002 Jean-Marc Valin */ |
| /** |
| @file filters.h |
| @brief Various analysis/synthesis filters |
| */ |
| /* |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions |
| are met: |
| |
| - Redistributions of source code must retain the above copyright |
| notice, this list of conditions and the following disclaimer. |
| |
| - Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in the |
| documentation and/or other materials provided with the distribution. |
| |
| - Neither the name of the Xiph.org Foundation nor the names of its |
| contributors may be used to endorse or promote products derived from |
| this software without specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR |
| CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef FILTERS_H |
| #define FILTERS_H |
| |
| #include "arch.h" |
| |
| spx_word16_t compute_rms(const spx_sig_t *x, int len); |
| spx_word16_t compute_rms16(const spx_word16_t *x, int len); |
| void signal_mul(const spx_sig_t *x, spx_sig_t *y, spx_word32_t scale, int len); |
| void signal_div(const spx_word16_t *x, spx_word16_t *y, spx_word32_t scale, int len); |
| |
| #ifdef FIXED_POINT |
| |
| int normalize16(const spx_sig_t *x, spx_word16_t *y, spx_sig_t max_scale, int len); |
| |
| #endif |
| |
| |
| #define HIGHPASS_NARROWBAND 0 |
| #define HIGHPASS_WIDEBAND 2 |
| #define HIGHPASS_INPUT 0 |
| #define HIGHPASS_OUTPUT 1 |
| #define HIGHPASS_IRS 4 |
| |
| void highpass(const spx_word16_t *x, spx_word16_t *y, int len, int filtID, spx_mem_t *mem); |
| |
| |
| 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); |
| 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); |
| |
| 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); |
| 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); |
| 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); |
| |
| /* Apply bandwidth expansion on LPC coef */ |
| void bw_lpc(spx_word16_t , const spx_coef_t *lpc_in, spx_coef_t *lpc_out, int order); |
| void sanitize_values32(spx_word32_t *vec, spx_word32_t min_val, spx_word32_t max_val, int len); |
| |
| |
| 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); |
| 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); |
| |
| 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); |
| |
| void multicomb( |
| spx_word16_t *exc, /*decoded excitation*/ |
| spx_word16_t *new_exc, /*enhanced excitation*/ |
| spx_coef_t *ak, /*LPC filter coefs*/ |
| int p, /*LPC order*/ |
| int nsf, /*sub-frame size*/ |
| int pitch, /*pitch period*/ |
| int max_pitch, /*pitch gain (3-tap)*/ |
| spx_word16_t comb_gain, /*gain of comb filter*/ |
| char *stack |
| ); |
| |
| #endif |