56 lines
1017 B
C
56 lines
1017 B
C
#include "config.h"
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#include <math.h>
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#include "windef.h"
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#include "debugtools.h"
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DEFAULT_DEBUG_CHANNEL(quartz);
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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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FIXME( "(%08ld): undocumented API.\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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FIXME( "(%08ld): undocumented API.\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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