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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__
typedef enum {
RESAMPLE_NEAREST = 0,
RESAMPLE_BILINEAR,
RESAMPLE_SINC_SLOW,
RESAMPLE_SINC,
} resample_method;
typedef enum {
RESAMPLE_S16 = 0,
RESAMPLE_FLOAT
} resample_format;
typedef struct resample_s resample_t;
struct resample_s {
/* parameters */
resample_method method;
int channels;
int verbose;
resample_format format;
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;
};
void resample_init(resample_t *r);
void resample_reinit(resample_t *r);
void resample_scale(resample_t *r, void *i_buf, unsigned int size);
#endif /* __RESAMPLE_H__ */
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