libs/appleutility/CAAUParameter.h

   1 /*      Copyright:      � Copyright 2005 Apple Computer, Inc. All rights reserved.
   2
   3         Disclaimer:     IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.
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   7                         please do not use, install, modify or redistribute this Apple software.
   8
   9                         In consideration of your agreement to abide by the following terms, and subject
  10                         to these terms, Apple grants you a personal, non-exclusive license, under Apple�s
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  24                         The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO
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  26                         WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  27                         PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
  28                         COMBINATION WITH YOUR PRODUCTS.
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  30                         IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
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  37 */
  38 /*=============================================================================
  39         CAAUParameter.h
  40
  41 =============================================================================*/
  42
  43 #ifndef __CAAUParameter_h__
  44 #define __CAAUParameter_h__
  45
  46 #include <AudioToolbox/AudioUnitUtilities.h>
  47
  48 // ____________________________________________________________________________
  49 //      CAAUParameter
  50 //      complete parameter specification
  51         /*! @class CAAUParameter */
  52 class CAAUParameter : public AudioUnitParameter {
  53 public:
  54                                                                 /*! @ctor CAAUParameter.0 */
  55                                                                 CAAUParameter();
  56                                                                 /*! @ctor CAAUParameter.1 */
  57                                                                 CAAUParameter(AudioUnit au, AudioUnitParameterID param, AudioUnitScope scope, AudioUnitElement element);
  58                                                                 /*! @ctor CAAUParameter.2 */
  59                                                                 CAAUParameter(AudioUnitParameter &inParam);
  60                                                                 /*! @ctor CAAUParameter.3 */
  61                                                                 CAAUParameter(const CAAUParameter &a);
  62                                                                 /*! @dtor ~CAAUParameter */
  63                                                                 ~CAAUParameter();
  64
  65         /*! @method operator <@ */
  66         bool                                            operator < (const CAAUParameter &a) const
  67                                                                 {
  68                                                                         return memcmp(this, &a, sizeof(AudioUnitParameter)) < 0;
  69                                                                 }
  70
  71         /*! @method operator ==@ */
  72         bool                                            operator == (const CAAUParameter &a) const
  73                                                                 {
  74                                                                         return !memcmp(this, &a, sizeof(AudioUnitParameter));
  75                                                                 }
  76
  77         /*! @method operator =@ */
  78         CAAUParameter &                         operator = (const CAAUParameter &a);
  79
  80         /*! @method GetValue */
  81         Float32                                         GetValue() const;
  82         /*! @method SetValue */
  83         void                                            SetValue(       AUParameterListenerRef                  inListener,
  84                                                                                         void *                                                  inObject,
  85                                                                                         Float32                                                 inValue) const;
  86
  87         /*! @method GetName */
  88         CFStringRef                                     GetName() const { return mParamName; }
  89                                                                                 // borrowed reference!
  90
  91         /*! @method GetStringFromValueCopy */
  92         CFStringRef                                     GetStringFromValueCopy(const Float32 *value = NULL) const;
  93                                                                                 // returns a copy of the name of the current parameter value
  94                                                                                 // or null if there is no name associated
  95                                                                                 // caller must release
  96         /*! @method ValuesHaveStrings */
  97         bool                                            ValuesHaveStrings () const
  98                                                                 {
  99                                                                         return (mParamInfo.flags & kAudioUnitParameterFlag_ValuesHaveStrings) != 0;
 100                                                                 }
 101
 102         /*! @method GetValueFromString */
 103         Float32                                         GetValueFromString (CFStringRef str) const;
 104                                                                         // caller must release
 105
 106         /*! @method ParamInfo */
 107         const AudioUnitParameterInfo &
 108                                                                 ParamInfo()     const { return mParamInfo; }
 109
 110         /*! @method GetParamTag */
 111         CFStringRef                                     GetParamTag() const     { return mParamTag; }
 112                                                                         // this may return null! -
 113                                                                         // in which case there is no descriptive tag for the parameter
 114
 115         /*! @method GetParamName */
 116         CFStringRef                                     GetParamName (int inIndex) const
 117                                                                         // this can return null if there is no name for the parameter
 118                                                                 {
 119                                                                         return (mNamedParams && inIndex < mNumIndexedParams)
 120                                                                                                 ? (CFStringRef) CFArrayGetValueAtIndex(mNamedParams, inIndex)
 121                                                                                                 : 0;
 122                                                                 }
 123
 124         /*! @method GetNumIndexedParams */
 125         int                                                     GetNumIndexedParams () const { return mNumIndexedParams; }
 126
 127         /*! @method IsIndexedParam */
 128         bool                                            IsIndexedParam () const { return mNumIndexedParams != 0; }
 129
 130         /*! @method HasNamedParams */
 131         bool                                            HasNamedParams () const { return IsIndexedParam() && mNamedParams; }
 132
 133         /*! @method GetClumpID */
 134         bool                                            GetClumpID (UInt32 &outClumpID) const
 135                                                                 {
 136                                                                         if (mParamInfo.flags & kAudioUnitParameterFlag_HasClump) {
 137                                                                                 outClumpID = mParamInfo.clumpID;
 138                                                                                 return true;
 139                                                                         }
 140                                                                         return false;
 141                                                                 }
 142
 143         /*! @method HasDisplayTransformation */
 144         bool                                            HasDisplayTransformation () const
 145                                                                 {
 146                                                                         return GetAudioUnitParameterDisplayType (mParamInfo.flags);
 147                                                                 }
 148
 149         /*! @method IsExpert */
 150         bool                                            IsExpert () const
 151                                                                 {
 152                                                                         return mParamInfo.flags & kAudioUnitParameterFlag_ExpertMode;
 153                                                                 }
 154 #if DEBUG
 155         void                                            Print () const;
 156 #endif
 157
 158                 // these methods are defined in CAPersistence.cpp
 159                 // they will persist and restore only the scope, element and param ID's of the AudioUnitParameter
 160                 // however, this is sufficient to be able to save/restore a CAAUParameter object
 161         void                                            Save (CFPropertyListRef &outData) const;
 162
 163         static void                                     Save (const AudioUnitParameter &inParam, CFPropertyListRef &outData);
 164
 165         static OSStatus                         Restore (const CFPropertyListRef inData, AudioUnitParameter &outParam);
 166
 167 protected:
 168         // cached parameter info
 169         /*! @var mParamInfo */
 170         AudioUnitParameterInfo          mParamInfo;
 171         /*! @var mParamName */
 172         CFStringRef                                     mParamName;
 173         /*! @var mParamTag */
 174         CFStringRef                                     mParamTag;
 175         /*! @var mNumIndexedParams */
 176         short                                           mNumIndexedParams;
 177         /*! @var mNamedParams */
 178         CFArrayRef                                      mNamedParams;
 179
 180 private:
 181         void                                            Init (AudioUnit au, AudioUnitParameterID param, AudioUnitScope scope, AudioUnitElement element);
 182
 183 };
 184
 185
 186
 187 #endif // __CAAUParameter_h__