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67 lines
2.1 KiB
67 lines
2.1 KiB
/*----------------------------------------------------------------------------
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*
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* File:
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* eas_pan.h
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*
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* Contents and purpose:
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* Calculates left and right gain multipliers based on a pan value from -63 to +63
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*
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* NOTES:
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* The _CMX_PARSER and _MFI_PARSER preprocessor symbols determine
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* whether the parser works for those particular file formats.
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*
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* Copyright Sonic Network Inc. 2005
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*----------------------------------------------------------------------------
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* Revision Control:
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* $Revision: 82 $
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* $Date: 2006-07-10 11:45:19 -0700 (Mon, 10 Jul 2006) $
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*----------------------------------------------------------------------------
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*/
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#ifndef _EAS_PAN_H
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#define _EAS_PAN_H
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#include "eas_types.h"
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/*----------------------------------------------------------------------------
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* EAS_CalcPanControl()
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*----------------------------------------------------------------------------
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* Purpose:
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* Assign the left and right gain values corresponding to the given pan value.
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*
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* This routine uses sin/cos approximations for an equal power curve:
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*
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* sin(x) = (2-4*c)*x^2 + c + x
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* cos(x) = (2-4*c)*x^2 + c - x
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*
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* where c = 1/sqrt(2)
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* using the a0 + x*(a1 + x*a2) approach
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*
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* Inputs:
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* pan - pan value (-63 to + 63)
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*
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* Outputs:
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* pGainLeft linear gain multiplier for left channel (15-bit fraction)
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* pGainRight linear gain multiplier for left channel (15-bit fraction)
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*
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* Side Effects:
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*----------------------------------------------------------------------------
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*/
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void EAS_CalcPanControl (EAS_INT pan, EAS_I16 *pGainLeft, EAS_I16 *pGainRight);
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#endif /* #ifndef _EAS_PAN_H */
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