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CAAUParameter.cpp

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/*=============================================================================
      CAAUParameter.cpp
      
=============================================================================*/

#include "CAAUParameter.h"

00045 CAAUParameter::CAAUParameter() 
{
      memset(this, 0, sizeof(CAAUParameter));
}

00050 CAAUParameter::CAAUParameter(AudioUnit au, AudioUnitParameterID param, AudioUnitScope scope, AudioUnitElement element)
{
      memset(this, 0, sizeof(CAAUParameter));
      Init (au, param, scope, element);
}

00056 CAAUParameter::CAAUParameter (AudioUnitParameter &inParam)
{
      memset(this, 0, sizeof(CAAUParameter));
      Init (inParam.mAudioUnit, inParam.mParameterID, inParam.mScope, inParam.mElement);
}

00062 CAAUParameter::CAAUParameter(const CAAUParameter &a) 
{
      memset(this, 0, sizeof(CAAUParameter));
      *this = a;
}

00068 CAAUParameter &   CAAUParameter::operator = (const CAAUParameter &a)
{
      if (mParamName) CFRelease(mParamName);
      if (mParamTag) CFRelease(mParamTag);
      if (mNamedParams) CFRelease(mNamedParams);
      
      memcpy(this, &a, sizeof(CAAUParameter));

      if (mParamName) CFRetain(mParamName);
      if (mParamTag) CFRetain(mParamTag);
      if (mNamedParams) CFRetain(mNamedParams);
      
      return *this;
}

00083 CAAUParameter::~CAAUParameter()
{
      if (mParamName) CFRelease(mParamName);
      if (mParamTag) CFRelease(mParamTag);
      if (mNamedParams) CFRelease (mNamedParams);
}

void        CAAUParameter::Init (AudioUnit au, AudioUnitParameterID param, AudioUnitScope scope, AudioUnitElement element)
{
      mAudioUnit = au;
      mParameterID = param;
      mScope = scope;
      mElement = element;
      
      UInt32 propertySize = sizeof(mParamInfo);
      OSStatus err = AudioUnitGetProperty(au, kAudioUnitProperty_ParameterInfo,
                  scope, param, &mParamInfo, &propertySize);
      if (err)
            memset(&mParamInfo, 0, sizeof(mParamInfo));
      if (mParamInfo.flags & kAudioUnitParameterFlag_HasCFNameString) {
            mParamName = mParamInfo.cfNameString;
            if (!(mParamInfo.flags & kAudioUnitParameterFlag_CFNameRelease)) 
                  CFRetain (mParamName);
      } else
            mParamName = CFStringCreateWithCString(NULL, mParamInfo.name, kCFStringEncodingUTF8);
      
      char* str = 0;
      switch (mParamInfo.unit)
      {
            case kAudioUnitParameterUnit_Boolean:
                  str = "T/F";
                  break;
            case kAudioUnitParameterUnit_Percent:
            case kAudioUnitParameterUnit_EqualPowerCrossfade:
                  str = "%";
                  break;
            case kAudioUnitParameterUnit_Seconds:
                  str = "Secs";
                  break;
            case kAudioUnitParameterUnit_SampleFrames:
                  str = "Samps";
                  break;
            case kAudioUnitParameterUnit_Phase:
            case kAudioUnitParameterUnit_Degrees:
                  str = "Degr.";
                  break;
            case kAudioUnitParameterUnit_Hertz:
                  str = "Hz";
                  break;
            case kAudioUnitParameterUnit_Cents:
            case kAudioUnitParameterUnit_AbsoluteCents:
                  str = "Cents";
                  break;
            case kAudioUnitParameterUnit_RelativeSemiTones:
                  str = "S-T";
                  break;
            case kAudioUnitParameterUnit_MIDINoteNumber:
            case kAudioUnitParameterUnit_MIDIController:
                  str = "MIDI";
                        //these are inclusive, so add one value here
                  mNumIndexedParams = short(mParamInfo.maxValue+1 - mParamInfo.minValue);
                  break;
            case kAudioUnitParameterUnit_Decibels:
                  str = "dB";
                  break;
            case kAudioUnitParameterUnit_MixerFaderCurve1:
            case kAudioUnitParameterUnit_LinearGain:
                  str = "Gain";
                  break;
            case kAudioUnitParameterUnit_Pan:
                  str = "L/R";
                  break;
            case kAudioUnitParameterUnit_Meters:
                  str = "Mtrs";
                  break;
            case kAudioUnitParameterUnit_Octaves:
                  str = "8ve";
                  break;
            case kAudioUnitParameterUnit_BPM:
                  str = "BPM";
                  break;
            case kAudioUnitParameterUnit_Beats:
                  str = "Beats";
                  break;
            case kAudioUnitParameterUnit_Milliseconds:
                  str = "msecs";
                  break;
            case kAudioUnitParameterUnit_Ratio:
                  str = "ratio";
                  break;
            case kAudioUnitParameterUnit_Indexed:
                  {
                        propertySize = sizeof(mNamedParams);
                        err = AudioUnitGetProperty (au, 
                                                      kAudioUnitProperty_ParameterValueStrings,
                                                      scope, 
                                                      param, 
                                                      &mNamedParams, 
                                                      &propertySize);
                        if (!err && mNamedParams) {
                              mNumIndexedParams = CFArrayGetCount(mNamedParams);
                        } else {
                                    //these are inclusive, so add one value here
                              mNumIndexedParams = short(mParamInfo.maxValue+1 - mParamInfo.minValue);
                        }
                        str = NULL;
                  }
                  break;
            case kAudioUnitParameterUnit_CustomUnit:
            {
                  CFStringRef unitName = mParamInfo.unitName;
                  static char paramStr[256];
                  CFStringGetCString (unitName, paramStr, 256, kCFStringEncodingUTF8);
                  if (mParamInfo.flags & kAudioUnitParameterFlag_CFNameRelease)
                        CFRelease (unitName);
                  str = paramStr;
                  break;
            }
            case kAudioUnitParameterUnit_Generic:
            case kAudioUnitParameterUnit_Rate:
            default:
                  str = NULL;
                  break;
      }
      
      if (str)
            mParamTag = CFStringCreateWithCString(NULL, str, kCFStringEncodingUTF8);
      else
            mParamTag = NULL;
}


00215 Float32           CAAUParameter::GetValue() const
{
      Float32 value = 0.;
      //OSStatus err = 
      AudioUnitGetParameter(mAudioUnit, mParameterID, mScope, mElement, &value);
      return value;
}

00223 CFStringRef CAAUParameter::GetStringFromValueCopy(const Float32 *value) const
{
      if (HasNamedParams())
      {
            Float32 val = (value == NULL ? GetValue() : *value);
            int index = int(mParamInfo.minValue) + int(val);
            CFStringRef str = GetParamName (index);
            if (str) {
                  CFRetain (str);
                  return str;
            }
      }
      else if (ValuesHaveStrings()) 
      {
            AudioUnitParameterStringFromValue stringValue;
            stringValue.inParamID = mParameterID;
            stringValue.inValue = value;
            stringValue.outString = NULL;
            UInt32 propertySize = sizeof(stringValue);
            
            OSStatus err = AudioUnitGetProperty (mAudioUnit, 
                                                                  kAudioUnitProperty_ParameterStringFromValue,
                                                                  mScope, 
                                                                  mParameterID, 
                                                                  &stringValue, 
                                                                  &propertySize);
            
            if (err == noErr && stringValue.outString != NULL)
                  return stringValue.outString;
      }
      
      Float32 val = (value == NULL ? GetValue() : *value);
      char valstr[32];
      AUParameterFormatValue (val, this, valstr, 4);
      return CFStringCreateWithCString(NULL, valstr, kCFStringEncodingUTF8);
}

00260 Float32 CAAUParameter::GetValueFromString(CFStringRef str) const
{
      if (ValuesHaveStrings()) 
      {
            AudioUnitParameterValueFromString valueString;
            valueString.inParamID = mParameterID;
            valueString.inString = str;
            UInt32 propertySize = sizeof(valueString);
            
            OSStatus err = AudioUnitGetProperty (mAudioUnit, 
                                                            kAudioUnitProperty_ParameterValueFromString,
                                                            mScope, 
                                                            mParameterID, 
                                                            &valueString, 
                                                            &propertySize);
                                                            
            if (err == noErr) {
                  return valueString.outValue;
            }
      }
      
      Float32 paramValue = mParamInfo.defaultValue;
      char valstr[32];
      CFStringGetCString(str, valstr, sizeof(valstr), kCFStringEncodingUTF8);
      sscanf(valstr, "%f", &paramValue);
      return paramValue;
}

00288 void        CAAUParameter::SetValue(      AUParameterListenerRef        inListener, 
                                                      void *                                          inObject,
                                                      Float32                                         inValue) const
{
    // clip inValue as: maxValue >= inValue >= minValue before setting
    Float32 valueToSet = inValue;
    if (valueToSet > mParamInfo.maxValue)
        valueToSet = mParamInfo.maxValue;
    if (valueToSet < mParamInfo.minValue)
        valueToSet = mParamInfo.minValue;
    
      AUParameterSet(inListener, inObject, this, valueToSet, 0);
}

#if DEBUG
void  CAAUParameter::Print() const
{
      UInt32 clump = 0;
      GetClumpID (clump);
      
      UInt32 len = CFStringGetLength(mParamName);
      char* chars = (char*)malloc (len * 2); // give us plenty of room for unichar chars
      if (!CFStringGetCString (mParamName, chars, len * 2, kCFStringEncodingUTF8))
            chars[0] = 0;
      
      printf ("ID: %ld, Clump: %ld, Name: %s\n", mParameterID, clump, chars);
      free (chars);
}
#endif

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