139 lines
6.2 KiB
C++
139 lines
6.2 KiB
C++
/* Copyright: © Copyright 2005 Apple Computer, Inc. All rights reserved.
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Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.
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("Apple") in consideration of your agreement to the following terms, and your
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use, installation, modification or redistribution of this Apple software
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constitutes acceptance of these terms. If you do not agree with these terms,
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please do not use, install, modify or redistribute this Apple software.
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In consideration of your agreement to abide by the following terms, and subject
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to these terms, Apple grants you a personal, non-exclusive license, under AppleÕs
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copyrights in this original Apple software (the "Apple Software"), to use,
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reproduce, modify and redistribute the Apple Software, with or without
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modifications, in source and/or binary forms; provided that if you redistribute
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the Apple Software in its entirety and without modifications, you must retain
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this notice and the following text and disclaimers in all such redistributions of
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the Apple Software. Neither the name, trademarks, service marks or logos of
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Apple Computer, Inc. may be used to endorse or promote products derived from the
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Apple Software without specific prior written permission from Apple. Except as
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expressly stated in this notice, no other rights or licenses, express or implied,
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are granted by Apple herein, including but not limited to any patent rights that
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may be infringed by your derivative works or by other works in which the Apple
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Software may be incorporated.
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The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
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WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
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WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
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COMBINATION WITH YOUR PRODUCTS.
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IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
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OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
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(INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*=============================================================================
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CAAudioChannelLayout.cpp
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=============================================================================*/
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//=============================================================================
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// Includes
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//=============================================================================
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// Self Include
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#include "CAAudioChannelLayout.h"
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#include <stdlib.h>
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#include <string.h>
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//=============================================================================
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// CAAudioChannelLayout
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//=============================================================================
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AudioChannelLayout* CAAudioChannelLayout::Create(UInt32 inNumberChannelDescriptions)
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{
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UInt32 theSize = CalculateByteSize(inNumberChannelDescriptions);
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AudioChannelLayout* theAnswer = static_cast<AudioChannelLayout*>(calloc(1, theSize));
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if(theAnswer != NULL)
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{
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SetAllToUnknown(*theAnswer, inNumberChannelDescriptions);
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}
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return theAnswer;
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}
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void CAAudioChannelLayout::Destroy(AudioChannelLayout* inChannelLayout)
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{
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free(inChannelLayout);
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}
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void CAAudioChannelLayout::SetAllToUnknown(AudioChannelLayout& outChannelLayout, UInt32 inNumberChannelDescriptions)
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{
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outChannelLayout.mChannelLayoutTag = kAudioChannelLayoutTag_UseChannelDescriptions;
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outChannelLayout.mChannelBitmap = 0;
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outChannelLayout.mNumberChannelDescriptions = inNumberChannelDescriptions;
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for(UInt32 theChannelIndex = 0; theChannelIndex < inNumberChannelDescriptions; ++theChannelIndex)
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{
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outChannelLayout.mChannelDescriptions[theChannelIndex].mChannelLabel = kAudioChannelLabel_Unknown;
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outChannelLayout.mChannelDescriptions[theChannelIndex].mChannelFlags = 0;
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outChannelLayout.mChannelDescriptions[theChannelIndex].mCoordinates[0] = 0;
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outChannelLayout.mChannelDescriptions[theChannelIndex].mCoordinates[1] = 0;
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outChannelLayout.mChannelDescriptions[theChannelIndex].mCoordinates[2] = 0;
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}
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}
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bool operator== (const AudioChannelLayout &x, const AudioChannelLayout &y)
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{
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// compare based on the number of channel descriptions present
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// (this may be too strict a comparison if all you care about are matching layout tags)
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UInt32 theSize1 = CAAudioChannelLayout::CalculateByteSize(x.mNumberChannelDescriptions);
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UInt32 theSize2 = CAAudioChannelLayout::CalculateByteSize(y.mNumberChannelDescriptions);
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if (theSize1 != theSize2)
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return false;
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return !memcmp (&x, &y, theSize1);
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}
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// counting the one bits in a word
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inline UInt32 CountOnes(UInt32 x)
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{
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// secret magic algorithm for counting bits in a word.
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UInt32 t;
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x = x - ((x >> 1) & 0x55555555);
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t = ((x >> 2) & 0x33333333);
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x = (x & 0x33333333) + t;
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x = (x + (x >> 4)) & 0x0F0F0F0F;
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x = x + (x << 8);
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x = x + (x << 16);
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return x >> 24;
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}
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UInt32 CAAudioChannelLayout::NumberChannels (const AudioChannelLayout& inLayout)
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{
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if (inLayout.mChannelLayoutTag == kAudioChannelLayoutTag_UseChannelDescriptions)
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return inLayout.mNumberChannelDescriptions;
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if (inLayout.mChannelLayoutTag == kAudioChannelLayoutTag_UseChannelBitmap)
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return CountOnes (inLayout.mChannelBitmap);
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return AudioChannelLayoutTag_GetNumberOfChannels(inLayout.mChannelLayoutTag);
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}
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void CAShowAudioChannelLayout (FILE* file, const AudioChannelLayout *layout)
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{
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fprintf (file, "\tTag=0x%lX, ", layout->mChannelLayoutTag);
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if (layout->mChannelLayoutTag == kAudioChannelLayoutTag_UseChannelBitmap)
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fprintf (file, "Using Bitmap:0x%lX\n", layout->mChannelBitmap);
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else {
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fprintf (file, "Num Chan Descs=%ld\n", layout->mNumberChannelDescriptions);
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const AudioChannelDescription *desc = layout->mChannelDescriptions;
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for (unsigned int i = 0; i < layout->mNumberChannelDescriptions; ++i, ++desc) {
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fprintf (file, "\t\tLabel=%ld, Flags=0x%lX, ", desc->mChannelLabel, desc->mChannelFlags);
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fprintf (file, "[az=%f,el=%f,dist=%f]\n", desc->mCoordinates[0], desc->mCoordinates[1], desc->mCoordinates[2]);
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}
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}
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}
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