AAX_SampleRateUtils.h

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/*================================================================================================*/
/*
 *  Copyright 2009-2015, 2023 Avid Technology, Inc.
 *  All rights reserved.
 *  
 *  CONFIDENTIAL: this document contains confidential information of Avid. Do
 *  not disclose to any third party. Use of the information contained in this
 *  document is subject to an Avid SDK license.
 */
 
/*================================================================================================*/
#pragma once
 
enum ESRUtils
{
    eSRUtils_48kRangeCoarse     = 48000,
    eSRUtils_96kRangeCoarse     = 96000,
    eSRUtils_192kRangeCoarse    = 192000,
    eSRUtils_48kRangeMin        = 0,
    eSRUtils_48kRangeMax        = 51000,
    eSRUtils_96kRangeMin        = eSRUtils_48kRangeMax+1,
    eSRUtils_96kRangeMax        = 102000,
    eSRUtils_192kRangeMin       = eSRUtils_96kRangeMax+1,
    eSRUtils_192kRangeMax       = 204000,
    eSRUtils_48kIndex       = 0,
    eSRUtils_96kIndex       = 1,
    eSRUtils_192kIndex      = 2
};
    
inline int CoarseSampleRate (int iRate)
{
    const int aCoarseRate =
 
        ((iRate >= eSRUtils_48kRangeMin) && (iRate <= eSRUtils_48kRangeMax)) ?  eSRUtils_48kRangeCoarse :
        ((iRate >= eSRUtils_96kRangeMin) && (iRate <= eSRUtils_96kRangeMax)) ?  eSRUtils_96kRangeCoarse :
        ((iRate >= eSRUtils_192kRangeMin) && (iRate <= eSRUtils_192kRangeMax)) ? eSRUtils_192kRangeCoarse :
        0;
 
    if (aCoarseRate == 0)
    {
//      throw std::runtime_error ("unrecognized sample rate");
    }
    return aCoarseRate;
}
 
//Returns 1 for 48k, 2 for 96k, and 4 for 192k gross samples rate.
inline int CoarseSampleRateFactor (int iRate)
{
    const int kMinCoarseSampleRate=eSRUtils_48kRangeCoarse;
 
    int aCoarseRateFactor = CoarseSampleRate (iRate)/kMinCoarseSampleRate;
 
    return aCoarseRateFactor;
}
 
//Returns 0 for 48k, 1 for 96k, and 2 for 192k gross samples rate.
inline int CoarseSampleRateIndex (int iRate)
{
//  const long kMinGrossSampleRate=eSRUtils_48kRangeCoarse;
    int aGrossRateIndex = 0;
 
    switch ( CoarseSampleRate (iRate) )
    {
    default:
        case eSRUtils_48kRangeCoarse:
            aGrossRateIndex = 0;
            break;
        case eSRUtils_96kRangeCoarse:
            aGrossRateIndex = 1;
            break;
        case eSRUtils_192kRangeCoarse:
            aGrossRateIndex = 2;
            break;
//      default:
//          throw std::runtime_error ("unrecognized sample rate");
    }
 
    return aGrossRateIndex;
}