gstreamer/libs/resample/resample.h

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