75 lines
2 KiB
C
75 lines
2 KiB
C
/*
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Copyright (C) 2003-2013 Paul Brossier <piem@aubio.org>
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This file is part of aubio.
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aubio is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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aubio is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with aubio. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** \file
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Pitch detection using a Schmitt trigger
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This pitch extraction method implements a Schmitt trigger to estimate the
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period of a signal.
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This file was derived from the tuneit project, written by Mario Lang to
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detect the fundamental frequency of a sound.
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See http://delysid.org/tuneit.html
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\example pitch/test-pitchschmitt.c
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*/
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#ifndef AUBIO_PITCHSCHMITT_H
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#define AUBIO_PITCHSCHMITT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** pitch detection object */
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typedef struct _aubio_pitchschmitt_t aubio_pitchschmitt_t;
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/** execute pitch detection on an input buffer
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\param p pitch detection object as returned by new_aubio_pitchschmitt
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\param samples_in input signal vector (length as specified at creation time)
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\param cands_out pitch period estimates, in samples
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*/
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void aubio_pitchschmitt_do (aubio_pitchschmitt_t * p, const fvec_t * samples_in,
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fvec_t * cands_out);
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/** creation of the pitch detection object
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\param buf_size size of the input buffer to analyse
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*/
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aubio_pitchschmitt_t *new_aubio_pitchschmitt (uint_t buf_size);
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/** deletion of the pitch detection object
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\param p pitch detection object as returned by new_aubio_pitchschmitt
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*/
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void del_aubio_pitchschmitt (aubio_pitchschmitt_t * p);
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#ifdef __cplusplus
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}
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#endif
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#endif /* AUBIO_PITCHSCHMITT_H */
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