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Diffstat (limited to 'libs/appleutility/CAAudioChannelLayout.cpp')
-rw-r--r-- | libs/appleutility/CAAudioChannelLayout.cpp | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/libs/appleutility/CAAudioChannelLayout.cpp b/libs/appleutility/CAAudioChannelLayout.cpp new file mode 100644 index 0000000000..585ff44fb7 --- /dev/null +++ b/libs/appleutility/CAAudioChannelLayout.cpp @@ -0,0 +1,138 @@ +/* Copyright: © Copyright 2005 Apple Computer, Inc. All rights reserved. + + Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, 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 AppleÕs + 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 Computer, 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. +*/ +/*============================================================================= + CAAudioChannelLayout.cpp + +=============================================================================*/ + +//============================================================================= +// Includes +//============================================================================= + +// Self Include +#include "CAAudioChannelLayout.h" +#include <stdlib.h> +#include <string.h> + +//============================================================================= +// CAAudioChannelLayout +//============================================================================= + +AudioChannelLayout* CAAudioChannelLayout::Create(UInt32 inNumberChannelDescriptions) +{ + UInt32 theSize = CalculateByteSize(inNumberChannelDescriptions); + AudioChannelLayout* theAnswer = static_cast<AudioChannelLayout*>(calloc(1, theSize)); + if(theAnswer != NULL) + { + SetAllToUnknown(*theAnswer, inNumberChannelDescriptions); + } + return theAnswer; +} + +void CAAudioChannelLayout::Destroy(AudioChannelLayout* inChannelLayout) +{ + free(inChannelLayout); +} + +void CAAudioChannelLayout::SetAllToUnknown(AudioChannelLayout& outChannelLayout, UInt32 inNumberChannelDescriptions) +{ + outChannelLayout.mChannelLayoutTag = kAudioChannelLayoutTag_UseChannelDescriptions; + outChannelLayout.mChannelBitmap = 0; + outChannelLayout.mNumberChannelDescriptions = inNumberChannelDescriptions; + for(UInt32 theChannelIndex = 0; theChannelIndex < inNumberChannelDescriptions; ++theChannelIndex) + { + outChannelLayout.mChannelDescriptions[theChannelIndex].mChannelLabel = kAudioChannelLabel_Unknown; + outChannelLayout.mChannelDescriptions[theChannelIndex].mChannelFlags = 0; + outChannelLayout.mChannelDescriptions[theChannelIndex].mCoordinates[0] = 0; + outChannelLayout.mChannelDescriptions[theChannelIndex].mCoordinates[1] = 0; + outChannelLayout.mChannelDescriptions[theChannelIndex].mCoordinates[2] = 0; + } +} + +bool operator== (const AudioChannelLayout &x, const AudioChannelLayout &y) +{ + // compare based on the number of channel descriptions present + // (this may be too strict a comparison if all you care about are matching layout tags) + UInt32 theSize1 = CAAudioChannelLayout::CalculateByteSize(x.mNumberChannelDescriptions); + UInt32 theSize2 = CAAudioChannelLayout::CalculateByteSize(y.mNumberChannelDescriptions); + + if (theSize1 != theSize2) + return false; + + return !memcmp (&x, &y, theSize1); +} + +// counting the one bits in a word +inline UInt32 CountOnes(UInt32 x) +{ + // secret magic algorithm for counting bits in a word. + UInt32 t; + x = x - ((x >> 1) & 0x55555555); + t = ((x >> 2) & 0x33333333); + x = (x & 0x33333333) + t; + x = (x + (x >> 4)) & 0x0F0F0F0F; + x = x + (x << 8); + x = x + (x << 16); + return x >> 24; +} + +UInt32 CAAudioChannelLayout::NumberChannels (const AudioChannelLayout& inLayout) +{ + if (inLayout.mChannelLayoutTag == kAudioChannelLayoutTag_UseChannelDescriptions) + return inLayout.mNumberChannelDescriptions; + + if (inLayout.mChannelLayoutTag == kAudioChannelLayoutTag_UseChannelBitmap) + return CountOnes (inLayout.mChannelBitmap); + + return AudioChannelLayoutTag_GetNumberOfChannels(inLayout.mChannelLayoutTag); +} + +void CAShowAudioChannelLayout (FILE* file, const AudioChannelLayout *layout) +{ + fprintf (file, "\tTag=0x%lX, ", layout->mChannelLayoutTag); + if (layout->mChannelLayoutTag == kAudioChannelLayoutTag_UseChannelBitmap) + fprintf (file, "Using Bitmap:0x%lX\n", layout->mChannelBitmap); + else { + fprintf (file, "Num Chan Descs=%ld\n", layout->mNumberChannelDescriptions); + const AudioChannelDescription *desc = layout->mChannelDescriptions; + for (unsigned int i = 0; i < layout->mNumberChannelDescriptions; ++i, ++desc) { + fprintf (file, "\t\tLabel=%ld, Flags=0x%lX, ", desc->mChannelLabel, desc->mChannelFlags); + fprintf (file, "[az=%f,el=%f,dist=%f]\n", desc->mCoordinates[0], desc->mCoordinates[1], desc->mCoordinates[2]); + } + } +} |