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/*
File: CAAudioValueRange.cpp
Abstract: CAAudioValueRange.h
Version: 1.1
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
Inc. ("Apple") in consideration of your agreement to the following
terms, and your use, installation, modification or redistribution of
this Apple software constitutes acceptance of these terms. If you do
not agree with these terms, please do not use, install, modify or
redistribute this Apple software.
In consideration of your agreement to abide by the following terms, and
subject to these terms, Apple grants you a personal, non-exclusive
license, under Apple's copyrights in this original Apple software (the
"Apple Software"), to use, reproduce, modify and redistribute the Apple
Software, with or without modifications, in source and/or binary forms;
provided that if you redistribute the Apple Software in its entirety and
without modifications, you must retain this notice and the following
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Neither the name, trademarks, service marks or logos of Apple Inc. may
be used to endorse or promote products derived from the Apple Software
without specific prior written permission from Apple. Except as
expressly stated in this notice, no other rights or licenses, express or
implied, are granted by Apple herein, including but not limited to any
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The Apple Software is provided by Apple on an "AS IS" basis. APPLE
MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
Copyright (C) 2014 Apple Inc. All Rights Reserved.
*/
//==================================================================================================
// 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);
}
}
}
}
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