diff options
Diffstat (limited to 'distrho/src/CoreAudio106/PublicUtility/CAAudioChannelLayout.cpp')
| -rwxr-xr-x | distrho/src/CoreAudio106/PublicUtility/CAAudioChannelLayout.cpp | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/distrho/src/CoreAudio106/PublicUtility/CAAudioChannelLayout.cpp b/distrho/src/CoreAudio106/PublicUtility/CAAudioChannelLayout.cpp new file mode 100755 index 00000000..db401d17 --- /dev/null +++ b/distrho/src/CoreAudio106/PublicUtility/CAAudioChannelLayout.cpp @@ -0,0 +1,142 @@ +/* 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 "CAAudioChannelLayout.h" +#include "CAAutoDisposer.h" +#include <stdlib.h> +#include <string.h> + +//============================================================================= +// CAAudioChannelLayout +//============================================================================= + +AudioChannelLayout* CAAudioChannelLayout::Create(UInt32 inNumberChannelDescriptions) +{ + UInt32 theSize = CalculateByteSize(inNumberChannelDescriptions); + AudioChannelLayout* theAnswer = static_cast<AudioChannelLayout*>(CA_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) +{ + if (layout == NULL) + { + fprintf (file, "\tNULL layout\n"); + return; + } + fprintf (file, "\tTag=0x%X, ", (int)layout->mChannelLayoutTag); + if (layout->mChannelLayoutTag == kAudioChannelLayoutTag_UseChannelBitmap) + fprintf (file, "Using Bitmap:0x%X\n", (int)layout->mChannelBitmap); + else { + fprintf (file, "Num Chan Descs=%d\n", (int)layout->mNumberChannelDescriptions); + const AudioChannelDescription *desc = layout->mChannelDescriptions; + for (unsigned int i = 0; i < layout->mNumberChannelDescriptions; ++i, ++desc) { + fprintf (file, "\t\tLabel=%d, Flags=0x%X, ", (int)desc->mChannelLabel, (int)desc->mChannelFlags); + fprintf (file, "[az=%f,el=%f,dist=%f]\n", desc->mCoordinates[0], desc->mCoordinates[1], desc->mCoordinates[2]); + } + } +} |