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77 lines
1.8 KiB
C
77 lines
1.8 KiB
C
/*
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* Copyright (C) Hidenori TAKESHIMA
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "config.h"
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#include <math.h>
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#include "windef.h"
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#include "wine/obj_base.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(quartz);
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#include "quartz_private.h"
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/***********************************************************************
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* AmpFactorToDB (QUARTZ.@)
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*
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* undocumented.
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* converting from Amp to dB?
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*
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*/
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LONG WINAPI QUARTZ_AmpFactorToDB( LONG amp )
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{
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LONG dB;
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TRACE( "(%ld)\n", amp );
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if ( amp <= 0 || amp > 65536 )
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return 0;
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dB = (LONG)(2000.0 * log10((double)amp / 65536.0) + 0.5);
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if ( dB >= 0 ) dB = 0;
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if ( dB < -10000 ) dB = -10000;
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return dB;
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}
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/***********************************************************************
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* DBToAmpFactor (QUARTZ.@)
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*
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* undocumented.
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* converting from dB to Amp?
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*/
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LONG WINAPI QUARTZ_DBToAmpFactor( LONG dB )
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{
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LONG amp;
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TRACE( "(%ld)\n", dB );
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if ( dB >= 0 )
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return 65535;
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if ( dB < -10000 )
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return 0;
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amp = (LONG)(pow(10.0,dB / 2000.0) * 65536.0 + 0.5);
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if ( amp <= 0 ) amp = 1;
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if ( amp >= 65536 ) amp = 65535;
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return amp;
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}
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