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| author | yo mama <pepper@scannerjammer.com> | 2015-06-19 16:24:27 -0400 |
|---|---|---|
| committer | yo mama <pepper@scannerjammer.com> | 2015-06-19 16:24:27 -0400 |
| commit | 8adfb3bd99b4dcff2459756af090a640fd7a4b4a (patch) | |
| tree | c1e6adddda335f4d36a98039ccc5ac867ae7296d /pysoundtouch/soundtouch/source/SoundTouch/PeakFinder.h | |
clone
Diffstat (limited to 'pysoundtouch/soundtouch/source/SoundTouch/PeakFinder.h')
| -rw-r--r-- | pysoundtouch/soundtouch/source/SoundTouch/PeakFinder.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/pysoundtouch/soundtouch/source/SoundTouch/PeakFinder.h b/pysoundtouch/soundtouch/source/SoundTouch/PeakFinder.h new file mode 100644 index 0000000..4b6f163 --- /dev/null +++ b/pysoundtouch/soundtouch/source/SoundTouch/PeakFinder.h @@ -0,0 +1,94 @@ +////////////////////////////////////////////////////////////////////////////////
+///
+/// The routine detects highest value on an array of values and calculates the
+/// precise peak location as a mass-center of the 'hump' around the peak value.
+///
+/// Author : Copyright (c) Olli Parviainen
+/// Author e-mail : oparviai 'at' iki.fi
+/// SoundTouch WWW: http://www.surina.net/soundtouch
+///
+////////////////////////////////////////////////////////////////////////////////
+//
+// Last changed : $Date: 2009-02-21 18:00:14 +0200 (Sat, 21 Feb 2009) $
+// File revision : $Revision: 4 $
+//
+// $Id: PeakFinder.h 63 2009-02-21 16:00:14Z oparviai $
+//
+////////////////////////////////////////////////////////////////////////////////
+//
+// License :
+//
+// SoundTouch audio processing library
+// Copyright (c) Olli Parviainen
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 2.1 of the License, or (at your option) any later version.
+//
+// This library 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
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+//
+////////////////////////////////////////////////////////////////////////////////
+
+#ifndef _PeakFinder_H_
+#define _PeakFinder_H_
+
+namespace soundtouch
+{
+
+class PeakFinder
+{
+protected:
+ /// Min, max allowed peak positions within the data vector
+ int minPos, maxPos;
+
+ /// Calculates the mass center between given vector items.
+ double calcMassCenter(const float *data, ///< Data vector.
+ int firstPos, ///< Index of first vector item beloging to the peak.
+ int lastPos ///< Index of last vector item beloging to the peak.
+ ) const;
+
+ /// Finds the data vector index where the monotoniously decreasing signal crosses the
+ /// given level.
+ int findCrossingLevel(const float *data, ///< Data vector.
+ float level, ///< Goal crossing level.
+ int peakpos, ///< Peak position index within the data vector.
+ int direction /// Direction where to proceed from the peak: 1 = right, -1 = left.
+ ) const;
+
+ /// Finds the 'ground' level, i.e. smallest level between two neighbouring peaks, to right-
+ /// or left-hand side of the given peak position.
+ int findGround(const float *data, /// Data vector.
+ int peakpos, /// Peak position index within the data vector.
+ int direction /// Direction where to proceed from the peak: 1 = right, -1 = left.
+ ) const;
+
+ /// get exact center of peak near given position by calculating local mass of center
+ double getPeakCenter(const float *data, int peakpos, bool loose = 0) const;
+
+public:
+ /// Constructor.
+ PeakFinder();
+
+ /// Detect exact peak position of the data vector by finding the largest peak 'hump'
+ /// and calculating the mass-center location of the peak hump.
+ ///
+ /// \return The location of the largest base harmonic peak hump.
+ double detectPeak(const float *data, /// Data vector to be analyzed. The data vector has
+ /// to be at least 'maxPos' items long.
+ int minPos, ///< Min allowed peak location within the vector data.
+ int maxPos, ///< Max allowed peak location within the vector data.
+ bool loose = 0
+ );
+};
+
+}
+
+#endif // _PeakFinder_H_
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