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livetrax/libs/appleutility/CoreAudio/PublicUtility/CAAudioValueRange.cpp

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C++

/*
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);
}
}
}
}