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livetrax/libs/appleutility/CoreAudio/PublicUtility/CAAUParameter.h

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/*
File: CAAUParameter.h
Abstract: Part of CoreAudio Utility Classes
Version: 1.1
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*/
#ifndef __CAAUParameter_h__
#define __CAAUParameter_h__
#include <AudioToolbox/AudioUnitUtilities.h>
// ____________________________________________________________________________
// CAAUParameter
// complete parameter specification
/*! @class CAAUParameter */
class CAAUParameter : public AudioUnitParameter {
public:
/*! @ctor CAAUParameter.0 */
CAAUParameter();
/*! @ctor CAAUParameter.1 */
CAAUParameter(AudioUnit au, AudioUnitParameterID param, AudioUnitScope scope, AudioUnitElement element);
/*! @ctor CAAUParameter.2 */
CAAUParameter(AudioUnitParameter &inParam);
/*! @ctor CAAUParameter.3 */
CAAUParameter(const CAAUParameter &a);
/*! @dtor ~CAAUParameter */
~CAAUParameter();
/*! @method operator <@ */
bool operator < (const CAAUParameter &a) const
{
return memcmp(this, &a, sizeof(AudioUnitParameter)) < 0;
}
/*! @method operator ==@ */
bool operator == (const CAAUParameter &a) const
{
return !memcmp(this, &a, sizeof(AudioUnitParameter));
}
/*! @method operator =@ */
CAAUParameter & operator = (const CAAUParameter &a);
/*! @method GetValue */
Float32 GetValue() const;
/*! @method SetValue */
void SetValue( AUParameterListenerRef inListener,
void * inObject,
Float32 inValue) const;
/*! @method GetName */
CFStringRef GetName() const { return mParamName; }
// borrowed reference!
/*! @method GetStringFromValueCopy */
CFStringRef GetStringFromValueCopy(const Float32 *value = NULL) const;
// returns a copy of the name of the current parameter value
// or null if there is no name associated
// caller must release
/*! @method ValuesHaveStrings */
bool ValuesHaveStrings () const
{
return (mParamInfo.flags & kAudioUnitParameterFlag_ValuesHaveStrings) != 0;
}
/*! @method GetValueFromString */
Float32 GetValueFromString (CFStringRef str) const;
// caller must release
/*! @method ParamInfo */
const AudioUnitParameterInfo &
ParamInfo() const { return mParamInfo; }
/*! @method GetParamTag */
CFStringRef GetParamTag() const { return mParamTag; }
// this may return null! -
// in which case there is no descriptive tag for the parameter
/*! @method GetParamName */
CFStringRef GetParamName (int inIndex) const
// this can return null if there is no name for the parameter
{
return (mNamedParams && inIndex < mNumIndexedParams)
? (CFStringRef) CFArrayGetValueAtIndex(mNamedParams, inIndex)
: 0;
}
/*! @method GetNumIndexedParams */
int GetNumIndexedParams () const { return mNumIndexedParams; }
/*! @method IsIndexedParam */
bool IsIndexedParam () const { return mNumIndexedParams != 0; }
/*! @method HasNamedParams */
bool HasNamedParams () const { return IsIndexedParam() && mNamedParams; }
/*! @method GetClumpID */
bool GetClumpID (UInt32 &outClumpID) const
{
if (mParamInfo.flags & kAudioUnitParameterFlag_HasClump) {
outClumpID = mParamInfo.clumpID;
return true;
}
return false;
}
/*! @method HasDisplayTransformation */
bool HasDisplayTransformation () const
{
return GetAudioUnitParameterDisplayType (mParamInfo.flags);
}
/*! @method IsExpert */
bool IsExpert () const
{
return mParamInfo.flags & kAudioUnitParameterFlag_ExpertMode;
}
#if DEBUG
void Print () const;
#endif
// these methods are defined in CAPersistence.cpp
// they will persist and restore only the scope, element and param ID's of the AudioUnitParameter
// however, this is sufficient to be able to save/restore a CAAUParameter object
void Save (CFPropertyListRef &outData) const;
static void Save (const AudioUnitParameter &inParam, CFPropertyListRef &outData);
static OSStatus Restore (const CFPropertyListRef inData, AudioUnitParameter &outParam);
protected:
// cached parameter info
/*! @var mParamInfo */
AudioUnitParameterInfo mParamInfo;
/*! @var mParamName */
CFStringRef mParamName;
/*! @var mParamTag */
CFStringRef mParamTag;
/*! @var mNumIndexedParams */
short mNumIndexedParams;
/*! @var mNamedParams */
CFArrayRef mNamedParams;
private:
void Init (AudioUnit au, AudioUnitParameterID param, AudioUnitScope scope, AudioUnitElement element);
};
#endif // __CAAUParameter_h__