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filters.h

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00001 /* Copyright (C) 2002 Jean-Marc Valin 00002 File: filters.h 00003 Various analysis/synthesis filters 00004 00005 Redistribution and use in source and binary forms, with or without 00006 modification, are permitted provided that the following conditions 00007 are met: 00008 00009 - Redistributions of source code must retain the above copyright 00010 notice, this list of conditions and the following disclaimer. 00011 00012 - Redistributions in binary form must reproduce the above copyright 00013 notice, this list of conditions and the following disclaimer in the 00014 documentation and/or other materials provided with the distribution. 00015 00016 - Neither the name of the Xiph.org Foundation nor the names of its 00017 contributors may be used to endorse or promote products derived from 00018 this software without specific prior written permission. 00019 00020 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 00021 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 00022 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 00023 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR 00024 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00025 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 00026 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 00027 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 00028 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 00029 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00030 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00031 */ 00032 00033 #ifndef FILTERS_H 00034 #define FILTERS_H 00035 00036 00037 typedef struct CombFilterMem { 00038 int last_pitch; 00039 float last_pitch_gain[3]; 00040 float smooth_gain; 00041 } CombFilterMem; 00042 00043 00044 void qmf_decomp(float *xx, float *aa, float *y1, float *y2, int N, int M, float *mem, char *stack); 00045 void fir_mem_up(float *x, float *a, float *y, int N, int M, float *mem, char *stack); 00046 00047 00048 void filter_mem2(float *x, float *num, float *den, float *y, int N, int ord, float *mem); 00049 void fir_mem2(float *x, float *num, float *y, int N, int ord, float *mem); 00050 void iir_mem2(float *x, float *den, float *y, int N, int ord, float *mem); 00051 00052 /* Apply bandwidth expansion on LPC coef */ 00053 void bw_lpc(float gamma, float *lpc_in, float *lpc_out, int order); 00054 00055 00056 00057 /* FIR filter */ 00058 void fir_decim_mem(float *x, float *a, float *y, int N, int M, float *mem); 00059 00060 void syn_percep_zero(float *x, float *ak, float *awk1, float *awk2, float *y, int N, int ord, char *stack); 00061 00062 void residue_percep_zero(float *xx, float *ak, float *awk1, float *awk2, float *y, int N, int ord, char *stack); 00063 00064 void comp_filter_mem_init (CombFilterMem *mem); 00065 00066 void comb_filter( 00067 float *exc, /*decoded excitation*/ 00068 float *new_exc, /*enhanced excitation*/ 00069 float *ak, /*LPC filter coefs*/ 00070 int p, /*LPC order*/ 00071 int nsf, /*sub-frame size*/ 00072 int pitch, /*pitch period*/ 00073 float *pitch_gain, /*pitch gain (3-tap)*/ 00074 float comb_gain, /*gain of comb filter*/ 00075 CombFilterMem *mem 00076 ); 00077 00078 00079 #endif

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