ref: b540b2246d7c7bb3f8252be958144694a98e32e3
dir: /src/effects/timestretch.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_TIMESTRETCH_H
#define AUBIO_TIMESTRETCH_H
#ifdef __cplusplus
extern "C" {
#endif
/** \file
time stretching object
::aubio_timestretch_t can be used to open a source file, read samples from
it, time-stretch them, and write out the modified samples.
The time-stretching factor can be changed at any time using
aubio_timestretch_set_stretch().
A transposition can also be applied and changed at any time with
aubio_timestretch_set_transpose().
\example effects/test-timestretch.c
*/
/** time stretching object */
typedef struct _aubio_timestretch_t aubio_timestretch_t;
/** execute time stretching on an input signal frame
\param o time stretching object as returned by new_aubio_timestretch()
\param out timestretched output of size [hop_size]
\param read number of frames actually wrote out
*/
void aubio_timestretch_do (aubio_timestretch_t * o, fvec_t * out,
uint_t * read);
/** deletion of the time stretching object
\param o time stretching object as returned by new_aubio_timestretch()
*/
void del_aubio_timestretch (aubio_timestretch_t * o);
/** creation of the time stretching object
\param method time stretching algorithm ("default")
\param stretch initial time stretching factor
\param hop_size block size at which the frames should be produced
\param samplerate sampling rate of the signal
\return newly created ::aubio_timestretch_t
*/
aubio_timestretch_t *new_aubio_timestretch (const char_t * method,
smpl_t stretch, uint_t hop_size, uint_t samplerate);
/** push length samples from in to time stretching object
\param o time stretching object as returned by ::new_aubio_timestretch()
\param in input vector of new samples to push to time stretching object
\param length number of new samples to push from input vector
\return number of currently available samples
*/
sint_t aubio_timestretch_push(aubio_timestretch_t * o, fvec_t *in,
uint_t length);
/** get number of currently available samples from time stretching object
\param o time stretching object as returned by ::new_aubio_timestretch()
\return number of currently available samples
*/
sint_t aubio_timestretch_get_available(aubio_timestretch_t * o);
/** get the latency of the time stretching object, in samples
\param o time stretching object as returned by ::new_aubio_timestretch()
\return latency of the time stretching object in samples
*/
uint_t aubio_timestretch_get_latency (aubio_timestretch_t * o);
/** get the samplerate of the time stretching object
Call after new_aubio_timestretch() was called with 0 to match the original
samplerate of the input file.
\param o time stretching object as returned by new_aubio_timestretch()
\return samplerate of the time stretching object
*/
uint_t aubio_timestretch_get_samplerate (aubio_timestretch_t * o);
/** set the stretching ratio of the time stretching object
\param o time stretching object as returned by new_aubio_timestretch()
\param stretch new time stretching ratio of the time stretching object
(should be in the range [0.025; 10.])
\return 0 if successfull, non-zero otherwise
*/
uint_t aubio_timestretch_set_stretch (aubio_timestretch_t * o, smpl_t stretch);
/** get the transposition of the time stretching object, in semitones
\param o time stretching object as returned by ::new_aubio_timestretch()
\return time stretching ratio of the time stretching object, in the range
[0.025; 10.]
*/
smpl_t aubio_timestretch_get_stretch (aubio_timestretch_t * o);
/** set the pitch scale of the time stretching object
\param o time stretching object as returned by new_aubio_timestretch()
\param pitchscale new pitch scale of the time stretching 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_timestretch_set_pitchscale (aubio_timestretch_t * o,
smpl_t pitchscale);
/** get the pitchscale of the time stretching object
\param o time stretching object as returned by ::new_aubio_timestretch()
\return pitchscale of the time stretching object
*/
smpl_t aubio_timestretch_get_pitchscale (aubio_timestretch_t * o);
/** set the transposition of the time stretching object, in semitones
\param o time stretching object as returned by new_aubio_timestretch()
\param transpose new pitch transposition of the time stretching object,
expressed in semitones (should be in the range [-24;+24])
\return 0 if successfull, non-zero otherwise
*/
uint_t aubio_timestretch_set_transpose (aubio_timestretch_t * o,
smpl_t transpose);
/** get the transposition of the time stretching object, in semitones
\param o time stretching object as returned by ::new_aubio_timestretch()
\return transposition of the time stretching object, in semitones
*/
smpl_t aubio_timestretch_get_transpose (aubio_timestretch_t * o);
/** reset the time stretching object
\param o time stretching object as returned by ::new_aubio_timestretch()
\return 0 on success, non-zero otherwise
*/
uint_t aubio_timestretch_reset(aubio_timestretch_t * o);
#ifdef __cplusplus
}
#endif
#endif /* AUBIO_TIMESTRETCH_H */