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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());
}


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