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AUParamInfo.cpp

/*    Copyright:  © Copyright 2005 Apple Computer, Inc. All rights reserved.

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/*=============================================================================
      AUParamInfo.cpp
      
=============================================================================*/
#include "AUParamInfo.h"
#include "CAXException.h"

AUParamInfo::AUParamInfo (AudioUnit                   inAU, 
                                          bool                    inIncludeExpert, 
                                          bool                    inIncludeReadOnly,
                                          AudioUnitScope          inScope,
                                          AudioUnitElement  inElement)
      : mAU (inAU),
        mNumParams (0),
        mParamListID(NULL),
        mScope (inScope),
        mElement (inElement)
{
      UInt32 size;
      OSStatus result = AudioUnitGetPropertyInfo(mAU, kAudioUnitProperty_ParameterList, inScope, mElement, &size, NULL);
            if (size == 0 || result) return;
      
      int nparams = size / sizeof(AudioUnitPropertyID);
      mParamListID = new AudioUnitParameterID[nparams];

      memset (mParamListID, 0xFF, size);

      AudioUnitParameterID *paramList = new AudioUnitParameterID[nparams];
      
      result = AudioUnitGetProperty(mAU, kAudioUnitProperty_ParameterList, mScope, mElement, paramList, &size);
      if (result) {
            delete [] mParamListID;
            delete [] paramList;
            mParamListID = NULL;
            return;
      }
      
      ParameterMap params;
      for (int i = 0; i < nparams; ++i) 
      {
            CAAUParameter auvp (mAU, paramList[i], mScope, mElement); // took out only using global scope in CAAUParameter creation
            const AudioUnitParameterInfo &paramInfo = auvp.ParamInfo();
                  
            //    don't include if parameter can't be read or written
            if (!(paramInfo.flags & kAudioUnitParameterFlag_IsWritable) 
                  && !(paramInfo.flags & kAudioUnitParameterFlag_IsReadable))
                  continue;

            // only include if expert params wanted
            if (!inIncludeExpert && auvp.IsExpert())
                  continue;
            
            // only include if read only params are wanted
            if (!(paramInfo.flags & kAudioUnitParameterFlag_IsWritable) 
                  && (paramInfo.flags & kAudioUnitParameterFlag_IsReadable))
            {     
                  if (!inIncludeReadOnly)
                        continue;
            }
            
            mParamListID[mNumParams] = paramList[i];
            mNumParams++;
            
            // ok - if we're here, then we have a parameter we are going to display.
            UInt32 clump = 0;
            auvp.GetClumpID (clump);
            mParams[clump].push_back (auvp);
      }

      delete [] paramList;
}

AUParamInfo::~AUParamInfo()
{
      delete [] mParamListID;
}

UInt32                  AUParamInfo::NumParamsForClump (UInt32 inClump) const
{ 
      ParameterMap::const_iterator it = mParams.find(inClump);
      if (it != mParams.end()) 
            return (*it).second.size();
      return 0;
}

const CAAUParameter*    AUParamInfo::GetParamInfo (AudioUnitParameterID inParamID) const
{
      for (ParameterMap::const_iterator it = mParams.begin(); it != mParams.end(); ++it) {
            const ParameterList &list = (*it).second;
            for (ParameterList::const_iterator iter = list.begin(); iter != list.end(); ++iter) {
                  if (inParamID == (*iter).mParameterID) {
                        return &(*iter);
                  }
            }
      }
      return NULL;
}

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