/*

     File: CAAUParameter.cpp

 Abstract: CAAUParameter.h

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*/

#include "CAAUParameter.h"

CAAUParameter::CAAUParameter() 

{

    memset(this, 0, sizeof(CAAUParameter));

}

CAAUParameter::CAAUParameter(AudioUnit au, AudioUnitParameterID param, AudioUnitScope scope, AudioUnitElement element)

{

    memset(this, 0, sizeof(CAAUParameter));

    Init (au, param, scope, element);

}

CAAUParameter::CAAUParameter (AudioUnitParameter &inParam)

{

    memset(this, 0, sizeof(CAAUParameter));

    Init (inParam.mAudioUnit, inParam.mParameterID, inParam.mScope, inParam.mElement);

}

CAAUParameter::CAAUParameter(const CAAUParameter &a) 

{

    memset(this, 0, sizeof(CAAUParameter));

    *this = a;

}

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;

}

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);

    const 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;

}

Float32     CAAUParameter::GetValue() const

{

    Float32 value = 0.;

    //OSStatus err = 

    AudioUnitGetParameter(mAudioUnit, mParameterID, mScope, mElement, &value);

    return value;

}

CFStringRef CreateLocalizedStringForParameterValue ( double                 inParameterValue,

                                                     const CAAUParameter *  inParameter,

                                                     UInt32                 inDigits,

                                                     UInt32                 minDigits) {    

    if (!inParameter) return nil;

    AudioUnitParameterInfo info = inParameter->ParamInfo();

    int pow10;

    switch (info.unit) {

        case kAudioUnitParameterUnit_Hertz:

            // number of significant digits based on value

            pow10 = int(log10(fmax(inParameterValue, .000001)));

            break;

        default:

            // number of significant digits based on parameter range

            pow10 = int(log10(fmax(double(info.maxValue - info.minValue), .000001)));

            break;

    }

    // pow10    range           nDigitsAfterDecimal

    //  -2      .0100-.0999     4

    //  -1      .100-.999       3

    //  0       1.00-9.99       2

    //  1       10.0-99.9       1

    //  2       100-999         0

    //  3       1000-9990       -1

    //  4       10000-99900     -2

    int nDigitsAfterDecimal = inDigits - (pow10 + 1);

    if (nDigitsAfterDecimal < 0)

        nDigitsAfterDecimal = 0;    // the least number of digits possible is zero

    if (info.flags & kAudioUnitParameterFlag_IsHighResolution)

        nDigitsAfterDecimal = 4;

    CFLocaleRef currentLocale = CFLocaleCopyCurrent(); 

    CFNumberFormatterRef numberFormatter = CFNumberFormatterCreate (NULL, currentLocale, kCFNumberFormatterDecimalStyle);

    CFNumberRef maxFractionDigits = CFNumberCreate (NULL, kCFNumberIntType, &nDigitsAfterDecimal);

    if (nDigitsAfterDecimal > 0)

        nDigitsAfterDecimal = minDigits;

    CFNumberRef minFractionDigits = CFNumberCreate (NULL, kCFNumberIntType, &nDigitsAfterDecimal); 

    CFNumberFormatterSetProperty (numberFormatter, kCFNumberFormatterMinFractionDigits, minFractionDigits); 

    CFNumberFormatterSetProperty (numberFormatter, kCFNumberFormatterMaxFractionDigits, maxFractionDigits); 

    CFStringRef formattedNumberString = CFNumberFormatterCreateStringWithValue (NULL, numberFormatter, kCFNumberDoubleType, &inParameterValue); 

    CFRelease(currentLocale); 

    CFRelease(numberFormatter); 

    CFRelease(maxFractionDigits);

    CFRelease(minFractionDigits);

    return formattedNumberString;

}

CFStringRef CreateLocalizedStringForParameterValue ( double                 inParameterValue,

                                                     const CAAUParameter *  inParameter,

                                                     UInt32                 inDigits) { 

    return CreateLocalizedStringForParameterValue (inParameterValue, inParameter, inDigits, 1);

}

double ValueForLocalizedParameterString (CFStringRef string, const CAAUParameter * inParameter) {

    CFLocaleRef currentLocale = CFLocaleCopyCurrent(); 

    CFNumberFormatterRef numberFormatter = CFNumberFormatterCreate (NULL, currentLocale, kCFNumberFormatterDecimalStyle);

    double value = 0;

    Boolean worked = CFNumberFormatterGetValueFromString (numberFormatter, string, NULL, kCFNumberDoubleType, &value);

    CFRelease(currentLocale);

    CFRelease(numberFormatter);

    if (worked)

        return value;

    else {

        AudioUnitParameterInfo info = inParameter->ParamInfo();

        return info.defaultValue;

    }

}

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, 

                                            0, 

                                            &stringValue, 

                                            &propertySize);

        if (!err && stringValue.outString != NULL)

            return stringValue.outString;

    }

    Float32 val = (value == NULL ? GetValue() : *value);

    AudioUnitParameterUnit unit = this->ParamInfo().unit;

    if (unit ==  kAudioUnitParameterUnit_Cents || unit == kAudioUnitParameterUnit_AbsoluteCents)

        return CreateLocalizedStringForParameterValue(val, this, 4, 0);

    else

        return CreateLocalizedStringForParameterValue(val, this, 4);

}

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, 

                                        0, 

                                        &valueString, 

                                        &propertySize);

        if (!err) {

            return valueString.outValue;

        }

    }

    return (Float32) ValueForLocalizedParameterString(str, this);

}

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 = static_cast<UInt32>(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: %u, Name: %s\n", (long unsigned int) mParameterID, (unsigned int) clump, chars);

    free (chars);

}

#endif