source: src/synth/sampler.h @ 6cc2d9d

/*
  Copyright (C) 2003-2013 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_SAMPLER_H
#define AUBIO_SAMPLER_H

/** \file

  Load and play a sound file.

  This file loads a sample and gets ready to play it.

  The `_do` function adds the new samples to the input, and write the result as
  the output.

TODO:
  - add _preset_threaded(level)
  - add _set_stretch
  - add _set_pitch

  \example synth/test-sampler.c

*/

#ifdef __cplusplus
extern "C" {
#endif

/** sampler object */
typedef struct _aubio_sampler_t aubio_sampler_t;

/** create new sampler object

  \param samplerate the sampling rate of the new sampler
  \param hop_size the block size of the new sampler

  \return the newly created ::aubio_sampler_t

*/
aubio_sampler_t * new_aubio_sampler(uint_t hop_size, uint_t samplerate);

/** load source in sampler

  \param o sampler, created by new_aubio_sampler()
  \param uri the uri of the source to load

  \return 0 if successful, non-zero otherwise

  This function attempts to load a new source, swaps the current one with the
  newly loaded one (or NULL if loading failed), then delete the old one.

*/
uint_t aubio_sampler_load( aubio_sampler_t * o, const char_t * uri );

/** queue source in sampler

  \param o sampler, created by new_aubio_sampler()
  \param uri the uri of the source to load

  \return 0 if successfully queued, non-zero otherwise

  This function is identical to aubio_sampler_load(), except it will be called
  in its own thread to avoid blocking calls to aubio_sampler_do().

*/
uint_t aubio_sampler_queue(aubio_sampler_t * o, const char_t * uri );

/** process sampler function

  \param o sampler, created by new_aubio_sampler()
  \param output output of the sampler
  \param read number of samples actually read

  This function get new samples from the sampler and store them into output.

  The output vector will be completed with 0 if too few samples are available.

*/
void aubio_sampler_do ( aubio_sampler_t * o, fvec_t * output, uint_t *read);

/** process sampler function, multiple channels

  \param o sampler, created by new_aubio_sampler()
  \param output output of the sampler

This function gets new samples from the playing source into output.

*/
void aubio_sampler_do_multi ( aubio_sampler_t * o, fmat_t * output, uint_t *read);

/** get current playing state

  \param o sampler, created by new_aubio_sampler()

  \return 0 if not playing, 1 if playing

*/
uint_t aubio_sampler_get_playing ( const aubio_sampler_t * o );

/** set current playing state

  \param o sampler, created by new_aubio_sampler()
  \param playing 0 for not playing, 1 for playing

  \return 0 if successful, 1 otherwise

*/
uint_t aubio_sampler_set_playing ( aubio_sampler_t * o, uint_t playing );

uint_t aubio_sampler_get_loop(aubio_sampler_t * o);

/** set current looping state

  \param o sampler, created by new_aubio_sampler()
  \param looping 0 for not looping, 1 for looping

  \return 0 if successful, 1 otherwise

*/
uint_t aubio_sampler_set_loop(aubio_sampler_t * o, uint_t loop);

/** play sample from start

  \param o sampler, created by new_aubio_sampler()

  \return 0 if successful, 1 otherwise

*/
uint_t aubio_sampler_play ( aubio_sampler_t * o );

/** play sample from start, looping it

  \param o sampler, created by new_aubio_sampler()

  \return 0 if successful, 1 otherwise

*/
uint_t aubio_sampler_loop ( aubio_sampler_t * o );

/** play sample from start, once

  \param o sampler, created by new_aubio_sampler()

  \return 0 if successful, 1 otherwise

*/
uint_t aubio_sampler_trigger ( aubio_sampler_t * o );

/** stop sample

  \param o sampler, created by new_aubio_sampler()

  \return 0 if successful, 1 otherwise

*/
uint_t aubio_sampler_stop ( aubio_sampler_t * o );

/** get end-of-file status

  \param o sampler, created by new_aubio_sampler()

  \return 1 when the eof is being reached, 0 otherwise

*/
uint_t aubio_sampler_get_eof(aubio_sampler_t * o);

/** get end-of-file status

  \param o sampler, created by new_aubio_sampler()

  \return 1 when the eof is being reached, 0 otherwise

*/
uint_t aubio_sampler_get_finished (aubio_sampler_t * o);

/** get samplerate

  \param o sampler, created by new_aubio_sampler()

  \return samplerate of the sampler

*/
uint_t aubio_sampler_get_samplerate(aubio_sampler_t * o);

/** get the number of samples that were set to zero while opening a file

  \param o sampler, created by new_aubio_sampler()
  \param waited the number of frames processed during this block

  \return the total delay in samples when the file was successfuly opened, 0
  otherwise

*/
uint_t aubio_sampler_get_waited_opening(aubio_sampler_t * o, uint_t waited);

/** seek to position

  \param o sampler, created by new_aubio_sampler()
  \param pos position to seek to, in samples

  \return 0 if successful, 1 otherwise

*/
uint_t aubio_sampler_seek(aubio_sampler_t * o, uint_t pos);

/** destroy ::aubio_sampler_t object

  \param o sampler, created by new_aubio_sampler()

*/
void del_aubio_sampler( aubio_sampler_t * o );

#ifdef __cplusplus
}
#endif

#endif /* AUBIO_SAMPLER_H */