livetrax/libs/appleutility/CAAudioChannelLayoutObject.cpp

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/*=============================================================================
    CAAudioChannelLayoutObject.cpp
 
=============================================================================*/

#include "CAAudioChannelLayout.h"
#if !defined(__COREAUDIO_USE_FLAT_INCLUDES__)
	#include <CoreServices/CoreServices.h>
	#include <AudioToolbox/AudioFormat.h>
#else
	#include <CoreServices.h>
	#include <AudioFormat.h>
#endif


CAAudioChannelLayout::CAAudioChannelLayout ()
{
	mLayoutHolder = new ACLRefCounter (offsetof(AudioChannelLayout, mChannelDescriptions));
}

//=============================================================================
//	CAAudioChannelLayout::CAAudioChannelLayout
//=============================================================================
CAAudioChannelLayout::CAAudioChannelLayout (UInt32 inNumberChannels, bool inChooseSurround)
{		
		// this chooses default layouts based on the number of channels...
	UInt32 theSize = CalculateByteSize (inNumberChannels);
		
	mLayoutHolder = new ACLRefCounter (theSize);
	
	AudioChannelLayout* layout = mLayoutHolder->GetLayout();

	layout->mNumberChannelDescriptions = inNumberChannels;
	
	switch (inNumberChannels) 
	{
		case 1:
			layout->mChannelLayoutTag = kAudioChannelLayoutTag_Mono;
			break;
		case 2:
			layout->mChannelLayoutTag = inChooseSurround ? kAudioChannelLayoutTag_Binaural : kAudioChannelLayoutTag_Stereo;
			break;
		case 4:
			layout->mChannelLayoutTag = inChooseSurround ? kAudioChannelLayoutTag_Ambisonic_B_Format : kAudioChannelLayoutTag_AudioUnit_4;
			break;
		case 5:
			layout->mChannelLayoutTag = inChooseSurround ? kAudioChannelLayoutTag_AudioUnit_5_0 : kAudioChannelLayoutTag_AudioUnit_5;
			break;
		case 6:
			layout->mChannelLayoutTag = inChooseSurround ? kAudioChannelLayoutTag_AudioUnit_6_0 : kAudioChannelLayoutTag_AudioUnit_6;
			break;
		case 7:
			layout->mChannelLayoutTag = kAudioChannelLayoutTag_AudioUnit_7_0;
			break;
		case 8:
			layout->mChannelLayoutTag = kAudioChannelLayoutTag_AudioUnit_8;
			break;
		default:
			// here we have a "broken" layout, in the sense that we haven't any idea how to lay this out
			// the layout itself is all set to zeros
			// ### no longer true ###
			SetAllToUnknown(*layout, inNumberChannels);
			break;
	}
}

//=============================================================================
//	CAAudioChannelLayout::CAAudioChannelLayout
//=============================================================================
CAAudioChannelLayout::CAAudioChannelLayout (AudioChannelLayoutTag inLayoutTag)
	: mLayoutHolder(NULL)
{
	SetWithTag(inLayoutTag);
}

//=============================================================================
//	CAAudioChannelLayout::CAAudioChannelLayout
//=============================================================================
CAAudioChannelLayout::CAAudioChannelLayout (const CAAudioChannelLayout &c)
	: mLayoutHolder(NULL)
{
	*this = c;
}


//=============================================================================
//	CAAudioChannelLayout::AudioChannelLayout
//=============================================================================
CAAudioChannelLayout::CAAudioChannelLayout (const AudioChannelLayout* inChannelLayout)
	: mLayoutHolder(NULL)
{
	*this = inChannelLayout;
}

//=============================================================================
//	CAAudioChannelLayout::~CAAudioChannelLayout
//=============================================================================
CAAudioChannelLayout::~CAAudioChannelLayout ()
{
	if (mLayoutHolder) {
		mLayoutHolder->release();
		mLayoutHolder = NULL;
	}
}

//=============================================================================
//	CAAudioChannelLayout::CAAudioChannelLayout
//=============================================================================
CAAudioChannelLayout& CAAudioChannelLayout::operator= (const CAAudioChannelLayout &c)
{
	if (mLayoutHolder != c.mLayoutHolder) {
		if (mLayoutHolder)
			mLayoutHolder->release();
	
		if ((mLayoutHolder = c.mLayoutHolder) != NULL)
			mLayoutHolder->retain();
	}
	
	return *this;
}

CAAudioChannelLayout&	CAAudioChannelLayout::operator= (const AudioChannelLayout* inChannelLayout)
{
	if (mLayoutHolder)
		mLayoutHolder->release();

	UInt32 theSize = CalculateByteSize (inChannelLayout->mNumberChannelDescriptions);
	
	mLayoutHolder = new ACLRefCounter (theSize);
	
	memcpy(mLayoutHolder->mLayout, inChannelLayout, theSize);
	return *this;
}

void	CAAudioChannelLayout::SetWithTag(AudioChannelLayoutTag inTag)
{
	if (mLayoutHolder)
		mLayoutHolder->release();
	
	mLayoutHolder = new ACLRefCounter(offsetof(AudioChannelLayout, mChannelDescriptions[0]));
	AudioChannelLayout* layout = mLayoutHolder->GetLayout();
	layout->mChannelLayoutTag = inTag;
}

//=============================================================================
//	CAAudioChannelLayout::operator==
//=============================================================================
bool		CAAudioChannelLayout::operator== (const CAAudioChannelLayout &c) const
{
	if (mLayoutHolder == c.mLayoutHolder)
		return true;
	return Layout() == c.Layout();
}

//=============================================================================
//	CAAudioChannelLayout::Print
//=============================================================================
void		CAAudioChannelLayout::Print (FILE* file) const
{
	CAShowAudioChannelLayout (file, &Layout());
}