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159 lines
3.6 KiB
C
159 lines
3.6 KiB
C
/* Resampling library
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* Copyright (C) <2001> David Schleef <ds@schleef.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __RESAMPLE_H__
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#define __RESAMPLE_H__
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#include <config.h>
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typedef struct resample_s resample_t;
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struct resample_s {
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/* parameters */
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int method;
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int channels;
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int verbose;
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int filter_length;
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double i_rate;
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double o_rate;
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void *priv;
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void *(*get_buffer)(void *priv, unsigned int size);
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/* internal parameters */
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double halftaps;
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/* filter state */
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void *buffer;
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int buffer_len;
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double i_start;
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double o_start;
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double i_start_buf;
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double i_end_buf;
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double i_inc;
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double o_inc;
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double i_end;
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double o_end;
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int i_samples;
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int o_samples;
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void *i_buf, *o_buf;
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double acc[10];
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/* methods */
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void (*scale)(resample_t *r);
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double ack;
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};
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enum{
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RESAMPLE_NEAREST = 0,
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RESAMPLE_BILINEAR,
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RESAMPLE_SINC_SLOW,
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RESAMPLE_SINC,
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};
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void resample_init(resample_t *r);
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void resample_reinit(resample_t *r);
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void resample_scale(resample_t *r, void *i_buf, unsigned int size);
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void resample_nearest(resample_t *r);
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void resample_bilinear(resample_t *r);
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void resample_sinc(resample_t *r);
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void resample_sinc_slow(resample_t *r);
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typedef struct functable_s functable_t;
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struct functable_s {
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double start;
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double offset;
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int len;
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double invoffset;
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double scale;
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double scale2;
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double (*func_x)(void *,double x);
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double (*func_dx)(void *,double x);
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double (*func2_x)(void *,double x);
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double (*func2_dx)(void *,double x);
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double *fx;
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double *fdx;
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void *priv;
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};
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void functable_init(functable_t *t);
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double functable_eval(functable_t *t,double x);
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double functable_fir(functable_t *t,double x0,int n,double *data,int len);
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void functable_fir2(functable_t *t,double *r0, double *r1, double x0,
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int n,double *data,int len);
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double functable_sinc(void *p, double x);
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double functable_dsinc(void *p, double x);
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double functable_window_std(void *p, double x);
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double functable_window_dstd(void *p, double x);
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double functable_window_boxcar(void *p, double x);
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double functable_window_dboxcar(void *p, double x);
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/* math lib stuff */
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void conv_double_short_table(double *dest, short *src, int n);
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void conv_double_short_unroll(double *dest, short *src, int n);
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void conv_double_short_ref(double *dest, short *src, int n);
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#ifdef HAVE_CPU_PPC
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void conv_double_short_altivec(double *dest, short *src, int n);
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#endif
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void conv_short_double_ref(short *dest, double *src, int n);
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#ifdef HAVE_CPU_PPC
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void conv_short_double_ppcasm(short *dest, double *src, int n);
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#endif
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#ifdef HAVE_CPU_PPC
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#define conv_double_short conv_double_short_table
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#define conv_short_double conv_short_double_ppcasm
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#else
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#define conv_double_short conv_double_short_ref
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#define conv_short_double conv_short_double_ref
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#endif
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void conv_double_short_dstr(double *dest, short *src, int n, int dstr);
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void conv_short_double_sstr(short *dest, double *src, int n, int dstr);
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#endif /* __RESAMPLE_H__ */
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