Mercurial > hg > svcore
view base/LogRange.h @ 299:576be0d0d218
* Merge transform directory from sv-match-alignment branch
(the previous comment included notes for this stuff, but I missed it
in the actual merge)
* Fix crash when a transform fails to create an output model and the
thread that created the transform then deletes its input model thinking
it's no longer needed, even though the transform run thread is still
using it -- fix is to wait() on the transform before returning the
null output model
author | Chris Cannam |
---|---|
date | Fri, 28 Sep 2007 16:15:06 +0000 |
parents | 2268963dabd1 |
children | 1405f4a2caf3 |
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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */ /* Sonic Visualiser An audio file viewer and annotation editor. Centre for Digital Music, Queen Mary, University of London. This file copyright 2006 Chris Cannam. This program 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 2 of the License, or (at your option) any later version. See the file COPYING included with this distribution for more information. */ #ifndef _LOG_RANGE_H_ #define _LOG_RANGE_H_ class LogRange { public: /** * Map a linear range onto a logarithmic range. min and max are * passed as the extents of the linear range and returned as the * extents of the logarithmic range. thresh is the minimum value * for the log range, to be used if the linear range spans zero. */ static void mapRange(float &min, float &max, float thresh = -10); /** * Map a value onto a logarithmic range. This just means taking * the base-10 log of the absolute value, or using the threshold * value if the absolute value is zero. */ static float map(float value, float thresh = -10); /** * Map a value from the logarithmic range back again. This just * means taking the value'th power of ten. */ static float unmap(float value); }; #endif