shithub: aubio

ref: 20d8266e4b5ff10f33b90e485e1f2d0ed48b8c5a
dir: /src/temporal/resampler.c/

/*
  Copyright (C) 2003-2009 Paul Brossier <piem@aubio.org>

  This file is part of aubio.

  aubio is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  aubio 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 General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with aubio.  If not, see <http://www.gnu.org/licenses/>.

*/

#include "config.h"

#if HAVE_SAMPLERATE

#include <samplerate.h> /* from libsamplerate */

#include "aubio_priv.h"
#include "fvec.h"
#include "temporal/resampler.h"

struct _aubio_resampler_t {
	SRC_DATA  *proc;
	SRC_STATE *stat;
	smpl_t ratio;
	uint_t type;
};

aubio_resampler_t * new_aubio_resampler(smpl_t ratio, uint_t type) {
	aubio_resampler_t * s  = AUBIO_NEW(aubio_resampler_t);
	int error = 0;
	s->stat = src_new (type, 1, &error) ; /* only one channel */
	s->proc = AUBIO_NEW(SRC_DATA);
	if (error) AUBIO_ERR("%s\n",src_strerror(error));
	s->ratio = ratio;
	return s;
}

void del_aubio_resampler(aubio_resampler_t *s) {
	src_delete(s->stat);
	AUBIO_FREE(s->proc);
	AUBIO_FREE(s);
}

void aubio_resampler_do (aubio_resampler_t *s, 
    fvec_t * input,  fvec_t * output) {
	uint_t i ;
	s->proc->input_frames = input->length;
	s->proc->output_frames = output->length;
	s->proc->src_ratio = (double)s->ratio;
	for (i = 0 ; i< input->channels; i++) 
	{
		/* make SRC_PROC data point to input outputs */
		s->proc->data_in = (float *)input->data[i];
		s->proc->data_out= (float *)output->data[i];
		/* do resampling */
		src_process (s->stat, s->proc) ;
	}
}	

#endif /* HAVE_SAMPLERATE */