ref: bcf47ea4a19444e2af92cfd25994e169a5b80a63
dir: /src/pitch/pitchschmitt.c/
/* Copyright (C) 2004, 2005 Mario Lang <mlang@delysid.org> Copyright (C) 2003-2009 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/>. */ #include "aubio_priv.h" #include "fvec.h" #include "pitch/pitchschmitt.h" smpl_t aubio_schmittS16LE (aubio_pitchschmitt_t * p, uint_t nframes, signed short int *indata); struct _aubio_pitchschmitt_t { uint_t blockSize; uint_t rate; signed short int *schmittBuffer; signed short int *schmittPointer; signed short int *buf; }; aubio_pitchschmitt_t * new_aubio_pitchschmitt (uint_t size) { aubio_pitchschmitt_t *p = AUBIO_NEW (aubio_pitchschmitt_t); p->blockSize = size; p->schmittBuffer = AUBIO_ARRAY (signed short int, p->blockSize); p->buf = AUBIO_ARRAY (signed short int, p->blockSize); p->schmittPointer = p->schmittBuffer; return p; } void aubio_pitchschmitt_do (aubio_pitchschmitt_t * p, const fvec_t * input, fvec_t * output) { uint_t j; for (j = 0; j < input->length; j++) { p->buf[j] = input->data[j] * 32768.; } output->data[0] = aubio_schmittS16LE (p, input->length, p->buf); } smpl_t aubio_schmittS16LE (aubio_pitchschmitt_t * p, uint_t nframes, signed short int *indata) { uint_t i, j; uint_t blockSize = p->blockSize; signed short int *schmittBuffer = p->schmittBuffer; signed short int *schmittPointer = p->schmittPointer; smpl_t period = 0., trigfact = 0.6; for (i = 0; i < nframes; i++) { *schmittPointer++ = indata[i]; if (schmittPointer - schmittBuffer >= (sint_t) blockSize) { sint_t endpoint, startpoint, t1, t2, A1, A2, tc, schmittTriggered; schmittPointer = schmittBuffer; for (j = 0, A1 = 0, A2 = 0; j < blockSize; j++) { if (schmittBuffer[j] > 0 && A1 < schmittBuffer[j]) A1 = schmittBuffer[j]; if (schmittBuffer[j] < 0 && A2 < -schmittBuffer[j]) A2 = -schmittBuffer[j]; } t1 = (sint_t) (A1 * trigfact + 0.5); t2 = -(sint_t) (A2 * trigfact + 0.5); startpoint = 0; for (j = 1; j < blockSize && schmittBuffer[j] <= t1; j++); for ( ; j < blockSize - 1 && !(schmittBuffer[j] >= t2 && schmittBuffer[j + 1] < t2); j++); startpoint = j; schmittTriggered = 0; endpoint = startpoint + 1; for (j = startpoint, tc = 0; j < blockSize; j++) { if (!schmittTriggered) { schmittTriggered = (schmittBuffer[j] >= t1); } else if (schmittBuffer[j] >= t2 && schmittBuffer[j + 1] < t2) { endpoint = j; tc++; schmittTriggered = 0; } } if ((endpoint > startpoint) && (tc > 0)) { period = (smpl_t) (endpoint - startpoint) / tc; } } } p->schmittBuffer = schmittBuffer; p->schmittPointer = schmittPointer; return period; } void del_aubio_pitchschmitt (aubio_pitchschmitt_t * p) { AUBIO_FREE (p->schmittBuffer); AUBIO_FREE (p->buf); AUBIO_FREE (p); }