/*

     File: CAAudioValueRange.cpp

 Abstract: CAAudioValueRange.h

  Version: 1.1

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*/

//==================================================================================================

//  Includes

//==================================================================================================

//  Self Include

#include "CAAudioValueRange.h"

//  Standard Library

#include <algorithm>

//==================================================================================================

//  CAAudioValueRange

//==================================================================================================

Float64 CAAudioValueRange::BoundValue(const AudioValueRange& inRange, Float64 inValue)

{

    if (inValue <= inRange.mMinimum)

    {

        return inRange.mMinimum;

    }

    else if (inValue >= inRange.mMaximum)

    {

        return inRange.mMaximum;

    }

    else

    {

        return inValue;

    }

}

Float64 CAAudioValueRange::PickCommonSampleRate(const AudioValueRange& inRange)

{

    //  This routine will pick a "common" sample rate from the give range of rates or the maximum

    //  if no common rates can be found. It assumes that inRange contains a continuous range of

    //  sample rates.

    Float64 theAnswer = inRange.mMaximum;

    if(ContainsValue(inRange, 44100.0))

    {

        theAnswer = 44100.0;

    }

    else if(ContainsValue(inRange, 48000.0))

    {

        theAnswer = 48000.0;

    }

    else if(ContainsValue(inRange, 96000.0))

    {

        theAnswer = 96000.0;

    }

    else if(ContainsValue(inRange, 88200.0))

    {

        theAnswer = 88200.0;

    }

    else if(ContainsValue(inRange, 64000.0))

    {

        theAnswer = 64000.0;

    }

    else if(ContainsValue(inRange, 32000.0))

    {

        theAnswer = 32000.0;

    }

    else if(ContainsValue(inRange, 24000.0))

    {

        theAnswer = 24000.0;

    }

    else if(ContainsValue(inRange, 22050.0))

    {

        theAnswer = 22050.0;

    }

    else if(ContainsValue(inRange, 16000.0))

    {

        theAnswer = 16000.0;

    }

    else if(ContainsValue(inRange, 12000.0))

    {

        theAnswer = 12000.0;

    }

    else if(ContainsValue(inRange, 11025.0))

    {

        theAnswer = 11025.0;

    }

    else if(ContainsValue(inRange, 8000.0))

    {

        theAnswer = 8000.0;

    }

    return theAnswer;

}

bool    CAAudioValueRange::Intersection(const AudioValueRange& x, const AudioValueRange& y, AudioValueRange& outRange)

{

    bool isNonEmpty;

    if(!IsStrictlyLessThan(x, y) && !IsStrictlyGreaterThan(x, y))

    {

        outRange.mMinimum = std::max(x.mMinimum, y.mMinimum);

        outRange.mMaximum = std::min(x.mMaximum, y.mMaximum);

        isNonEmpty = true;

    }

    else

    {

        outRange.mMinimum = 0;

        outRange.mMaximum = 0;

        isNonEmpty = false;

    }

    return isNonEmpty;

}

bool    CAAudioValueRange::Union(const AudioValueRange& x, const AudioValueRange& y, AudioValueRange& outRange)

{

    bool isDisjoint;

    if(!IsStrictlyLessThan(x, y) && !IsStrictlyGreaterThan(x, y))

    {

        outRange.mMinimum = std::min(x.mMinimum, y.mMinimum);

        outRange.mMaximum = std::max(x.mMaximum, y.mMaximum);

        isDisjoint = false;

    }

    else

    {

        outRange.mMinimum = 0;

        outRange.mMaximum = 0;

        isDisjoint = true;

    }

    return isDisjoint;

}

void    CAAudioValueRange_ComputeUnion(const AudioValueRange& inRange, const CAAudioValueRangeList& inRangeList, CAAudioValueRangeList& outUnion)

{

    //  this method assumes that the ranges in inRangeList are disjoint and that they are sorted from low to high and

    outUnion.clear();

    //  start at the beginning of inRangeList

    CAAudioValueRangeList::const_iterator theIterator = inRangeList.begin();

    //  iterate through inRangeList and add all the ranges that are strictly less than inRange

    while((theIterator != inRangeList.end()) && CAAudioValueRange::IsStrictlyLessThan(*theIterator, inRange))

    {

        //  put this range in the union

        outUnion.push_back(*theIterator);

        //  go to the next one

        std::advance(theIterator, 1);

    }

    if(theIterator != inRangeList.end())

    {

        if(!CAAudioValueRange::IsStrictlyGreaterThan(*theIterator, inRange))

        {

            //  inRange intersects the range that theIterator points at, but might actually intersect several contiguous ranges

            //  initialize the starting point, noting that we can skip the current one since we already know it's in the intersection

            CAAudioValueRangeList::const_iterator theGreaterIterator = theIterator;

            std::advance(theGreaterIterator, 1);

            //  iterate until we find a range that is strictly greater than inRange

            while((theGreaterIterator != inRangeList.end()) && !CAAudioValueRange::IsStrictlyGreaterThan(*theGreaterIterator, inRange))

            {

                //  go to the next one

                std::advance(theGreaterIterator, 1);

            }

            //  theGreaterIterator now points at either one past the highest range in the intersection or the end of the vector

            //  Either way, we have to adjust it to point at the true highest range in the intersection

            std::advance(theGreaterIterator, -1);

            //  now theIterator points at the lowest range in the intersection and theGreaterIterator points at the highest

            //  so we can compute the coagulated range

            AudioValueRange theCoagulation;

            theCoagulation.mMinimum = std::min(theIterator->mMinimum, inRange.mMinimum);

            theCoagulation.mMaximum = std::max(theGreaterIterator->mMaximum, inRange.mMaximum);

            //  add the coagulation to the union

            outUnion.push_back(theCoagulation);

            //  adjust theIterator to point at the next range for processing

            theIterator = theGreaterIterator;

            std::advance(theIterator, 1);

        }

        else

        {

            //  the range theIterator points at is strictly greater than inRange, so insert inRange in front of it and we're done

            outUnion.push_back(inRange);

        }

        //  we need to now copy the remaining higher ranges in inRangeList into the union

        while(theIterator != inRangeList.end())

        {

            //  put this range in the union

            outUnion.push_back(*theIterator);

            //  go to the next one

            std::advance(theIterator, 1);

        }

    }

    else

    {

        //  inRange is larger than all of the ranges in inRangeList, so just add it onto the end of the union and we're done

        //  This is also the case if inRangeList is empty

        outUnion.push_back(inRange);

    }

}

void    CAAudioValueRange_ComputeIntersection(UInt32 inNumberRangeList1Items, AudioValueRange inRangeList1[], const CAAudioValueRangeList& inRangeList2, CAAudioValueRangeList& outIntersections)

{

    outIntersections.clear();

    for(UInt32 theRangeList1Index = 0; theRangeList1Index < inNumberRangeList1Items; ++theRangeList1Index)

    {

        for(CAAudioValueRangeList::const_iterator theRangeList2Iterator = inRangeList2.begin(); theRangeList2Iterator != inRangeList2.end(); std::advance(theRangeList2Iterator, 1))

        {

            AudioValueRange theIntersection;

            if(CAAudioValueRange::Intersection(inRangeList1[theRangeList1Index], *theRangeList2Iterator, theIntersection))

            {

                outIntersections.push_back(theIntersection);

            }

        }

    }

}