/*  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 __cplusplusextern "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;#pragma incomplete 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 */