41 lines
1.2 KiB
C
41 lines
1.2 KiB
C
/*
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* Copyright (C) 2006 Paul Davis
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* Copyright (C) 2007 Michael Taht
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* */
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#ifndef ardour_slider_gain
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#define ardour_slider_gain
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static inline double
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gain_to_slider_position (ARDOUR::gain_t g)
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{
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if (g == 0) return 0;
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return pow((6.0*log(g)/log(2.0)+192.0)/198.0, 8.0);
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}
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static inline ARDOUR::gain_t
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slider_position_to_gain (double pos)
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{
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/* XXX Marcus writes: this doesn't seem right to me. but i don't have a better answer ... */
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if (pos == 0.0) return 0;
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return pow (2.0,(sqrt(sqrt(sqrt(pos)))*198.0-192.0)/6.0);
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}
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#endif
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