From 0d4f573fc103544c7972485b010072eda52a0e4b Mon Sep 17 00:00:00 2001 From: Thomas Vander Stichele Date: Sun, 23 Dec 2001 10:44:28 +0000 Subject: adding resample lib Original commit message from CVS: adding resample lib --- gst-libs/gst/resample/resample.h | 159 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 159 insertions(+) create mode 100644 gst-libs/gst/resample/resample.h (limited to 'gst-libs/gst/resample/resample.h') diff --git a/gst-libs/gst/resample/resample.h b/gst-libs/gst/resample/resample.h new file mode 100644 index 00000000..1cc36edd --- /dev/null +++ b/gst-libs/gst/resample/resample.h @@ -0,0 +1,159 @@ +/* Resampling library + * Copyright (C) <2001> David Schleef + * + * 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 + +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__ */ + -- cgit v1.2.1