gstreamer/gst/audioscale/resample.h

/* 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 __GST_RESAMPLE_H__
#define __GST_RESAMPLE_H__

#include <glib.h>

G_BEGIN_DECLS

typedef enum {
	GST_RESAMPLE_NEAREST = 0,
	GST_RESAMPLE_BILINEAR,
	GST_RESAMPLE_SINC_SLOW,
	GST_RESAMPLE_SINC,
} gst_resample_method;

typedef enum {
	GST_RESAMPLE_S16 = 0,
	GST_RESAMPLE_FLOAT
} gst_resample_format;

typedef struct gst_resample_s gst_resample_t;

struct gst_resample_s {
	/* parameters */

	gst_resample_method method;
	int channels;
	int verbose;
	gst_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[2];
        union {
          struct {
            double *out_tmp;
            int out_tmp_len;
          } s;
          double padding[8];
        } hack_union;

	/* methods */
	void (*scale)(gst_resample_t *r);

	double ack;

};

void gst_resample_init(gst_resample_t *r);

void gst_resample_reinit(gst_resample_t *r);

void gst_resample_close (gst_resample_t * r);

void gst_resample_scale(gst_resample_t *r, void *i_buf, unsigned int size);

G_END_DECLS

#endif /* __GST_RESAMPLE_H__ */