/* Copyright (C) 2016 Paul Brossier 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 . */ #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 */