Add in tree aubio

Signed-off-by: falkTX <falktx@falktx.com>

deps/aubio/src/pitch/pitchschmitt.h

@@ -0,0 +1,75 @@
+/*
+  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/>.
+
+*/
+
+/** \file
+
+   Pitch detection using a Schmitt trigger
+
+   This pitch extraction method implements a Schmitt trigger to estimate the
+   period of a signal.
+
+   This file was derived from the tuneit project, written by Mario Lang to
+   detect the fundamental frequency of a sound.
+
+   See http://delysid.org/tuneit.html
+
+   \example pitch/test-pitchschmitt.c
+
+*/
+
+#ifndef AUBIO_PITCHSCHMITT_H
+#define AUBIO_PITCHSCHMITT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** pitch detection object */
+typedef struct _aubio_pitchschmitt_t aubio_pitchschmitt_t;
+
+/** execute pitch detection on an input buffer
+
+  \param p pitch detection object as returned by new_aubio_pitchschmitt
+  \param samples_in input signal vector (length as specified at creation time)
+  \param cands_out pitch period estimates, in samples
+
+*/
+void aubio_pitchschmitt_do (aubio_pitchschmitt_t * p, const fvec_t * samples_in,
+    fvec_t * cands_out);
+
+/** creation of the pitch detection object
+
+  \param buf_size size of the input buffer to analyse
+
+*/
+aubio_pitchschmitt_t *new_aubio_pitchschmitt (uint_t buf_size);
+
+/** deletion of the pitch detection object
+
+  \param p pitch detection object as returned by new_aubio_pitchschmitt
+
+*/
+void del_aubio_pitchschmitt (aubio_pitchschmitt_t * p);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* AUBIO_PITCHSCHMITT_H */