ref: 4c9aa80c2088fb8dd737ba2a01a3ee432605892b
dir: /src/effects/pitchshift.h/
/*
Copyright (C) 2016 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/>.
*/
#ifndef AUBIO_PITCHSHIFT_H
#define AUBIO_PITCHSHIFT_H
#ifdef __cplusplus
extern "C" {
#endif
/** \file
Pitch shifting object
::aubio_pitchshift_t can be used to transpose a stream of blocks of frames.
\example effects/test-pitchshift.c
*/
/** pitch shifting object */
typedef struct _aubio_pitchshift_t aubio_pitchshift_t;
/** execute pitch shifting on an input signal frame
\param o pitch shifting object as returned by new_aubio_pitchshift()
\param in input signal of size [hop_size]
\param out output pitch candidates of size [1]
*/
void aubio_pitchshift_do (aubio_pitchshift_t * o, const fvec_t * in,
fvec_t * out);
/** deletion of the pitch shifting object
\param o pitch shifting object as returned by new_aubio_pitchshift()
*/
void del_aubio_pitchshift (aubio_pitchshift_t * o);
/** creation of the pitch shifting object
\param method set pitch shifting algorithm ("default")
\param transpose initial pitch transposition
\param hop_size step size between two consecutive analysis instant
\param samplerate sampling rate of the signal
\return newly created ::aubio_pitchshift_t
*/
aubio_pitchshift_t *new_aubio_pitchshift (const char_t * method,
smpl_t transpose, uint_t hop_size, uint_t samplerate);
/** get the latency of the pitch shifting object, in samples
\param o pitch shifting object as returned by ::new_aubio_pitchshift()
\return latency of the pitch shifting object in samples
*/
uint_t aubio_pitchshift_get_latency (aubio_pitchshift_t * o);
/** set the pitch scale of the pitch shifting object
\param o pitch shifting object as returned by new_aubio_pitchshift()
\param pitchscale new pitch scale of the pitch shifting object
pitchscale is a frequency ratio. It should be in the range [0.25, 4].
\return 0 if successfull, non-zero otherwise
*/
uint_t aubio_pitchshift_set_pitchscale (aubio_pitchshift_t * o,
smpl_t pitchscale);
/** get the pitchscale of the pitch shifting object
\param o pitch shifting object as returned by ::new_aubio_pitchshift()
\return pitchscale of the pitch shifting object
*/
smpl_t aubio_pitchshift_get_pitchscale (aubio_pitchshift_t * o);
/** set the transposition of the pitch shifting object, in semitones
\param o pitch shifting object as returned by new_aubio_pitchshift()
\param transpose new pitch transposition of the pitch shifting object,
expressed in semitones (should be in the range [-24;+24])
\return 0 if successfull, non-zero otherwise
*/
uint_t aubio_pitchshift_set_transpose (aubio_pitchshift_t * o,
smpl_t transpose);
/** get the transposition of the pitch shifting object, in semitones
\param o pitch shifting object as returned by ::new_aubio_pitchshift()
\return transposition of the pitch shifting object, in semitones
*/
smpl_t aubio_pitchshift_get_transpose (aubio_pitchshift_t * o);
#ifdef __cplusplus
}
#endif
#endif /* AUBIO_PITCHSHIFT_H */