/* 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__ */