diff options
Diffstat (limited to 'distrho/src/CoreAudio106/PublicUtility/CAAudioValueRange.cpp')
| -rwxr-xr-x | distrho/src/CoreAudio106/PublicUtility/CAAudioValueRange.cpp | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/distrho/src/CoreAudio106/PublicUtility/CAAudioValueRange.cpp b/distrho/src/CoreAudio106/PublicUtility/CAAudioValueRange.cpp new file mode 100755 index 00000000..f3374bb5 --- /dev/null +++ b/distrho/src/CoreAudio106/PublicUtility/CAAudioValueRange.cpp @@ -0,0 +1,244 @@ +/* Copyright © 2007 Apple Inc. All Rights Reserved. + + 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 + text and disclaimers in all such redistributions of the Apple Software. + 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 patent rights that may be infringed by your derivative works or by + other works in which the Apple Software may be incorporated. + + 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. +*/ +//================================================================================================== +// Includes +//================================================================================================== + +// Self Include +#include "CAAudioValueRange.h" + +// Standard Library +#include <algorithm> + +//================================================================================================== +// CAAudioValueRange +//================================================================================================== + +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(const AudioValueRange& inRange, const CAAudioValueRangeList& inRangeList, CAAudioValueRangeList& outIntersections) +{ + outIntersections.clear(); + // iterate through the list and compute the intersections + CAAudioValueRangeList::const_iterator theIterator = inRangeList.begin(); + while(theIterator != inRangeList.end()) + { + // figure out if the range intersects + AudioValueRange theIntersection; + if(CAAudioValueRange::Intersection(inRange, *theIterator, theIntersection)) + { + // it does, so add the intersection to the return list + outIntersections.push_back(theIntersection); + } + + // go to the next one + std::advance(theIterator, 1); + } +} |