AUParamInfo.cpp

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#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;
}