libs/appleutility/AUOutputBL.h

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  38 /*=============================================================================
  39         AUOutputBL.h
  40
  41 =============================================================================*/
  42
  43 #ifndef __AUOutputBL_h__
  44 #define __AUOutputBL_h__
  45
  46 #include "CAStreamBasicDescription.h"
  47 #if !defined(__COREAUDIO_USE_FLAT_INCLUDES__)
  48         #include <CoreServices/CoreServices.h>
  49 #else
  50         #include <AssertMacros.h>
  51 #endif
  52
  53 // ____________________________________________________________________________
  54 //
  55 //      AUOutputBL - Simple Buffer List wrapper targetted to use with retrieving AU output
  56 // Works in one of two ways (both adjustable)... Can use it with NULL pointers, or allocate
  57 // memory to receive the data in.
  58
  59 // Before using this with any call to AudioUnitRender, it needs to be Prepared
  60 // as some calls to AudioUnitRender can reset the ABL
  61
  62 class AUOutputBL {
  63 public:
  64
  65                                                                                         // you CANNOT use one of these - it will crash!
  66 //                                                                              AUOutputBL ();
  67
  68                                                                                         // this is the constructor that you use
  69                                                                                         // it can't be reset once you've constructed it
  70                                                                                 AUOutputBL (const CAStreamBasicDescription &inDesc, UInt32 inDefaultNumFrames = 512);
  71                                                                                 ~AUOutputBL();
  72
  73         void                                                            Prepare ()
  74                                                                                 {
  75                                                                                         Prepare (mFrames);
  76                                                                                 }
  77
  78                                                                 // this version can throw if this is an allocted ABL and inNumFrames is > AllocatedFrames()
  79                                                                 // you can set the bool to true if you want a NULL buffer list even if allocated
  80                                                                 // inNumFrames must be a valid number (will throw if inNumFrames is 0)
  81         void                                                            Prepare (UInt32 inNumFrames, bool inWantNullBufferIfAllocated = false);
  82
  83         AudioBufferList*                                        ABL() { return mBufferList; }
  84
  85                                                                 // You only need to call this if you want to allocate a buffer list
  86                                                                 // if you want an empty buffer list, just call Prepare()
  87                                                                 // if you want to dispose previously allocted memory, pass in 0
  88                                                                 // then you either have an empty buffer list, or you can re-allocate
  89                                                                 // Memory is kept around if an Allocation request is less than what is currently allocated
  90         void                                                            Allocate (UInt32 inNumberFrames);
  91
  92         UInt32                                                          AllocatedFrames() const { return mFrames; }
  93
  94         const CAStreamBasicDescription&         GetFormat() const { return mFormat; }
  95
  96 #if DEBUG
  97         void                                                            Print();
  98 #endif
  99
 100 private:
 101         UInt32                                          AllocatedBytes () const { return (mBufferSize * mNumberBuffers); }
 102
 103         CAStreamBasicDescription        mFormat;
 104         Byte*                                           mBufferMemory;
 105         AudioBufferList*                        mBufferList;
 106         UInt32                                          mNumberBuffers;
 107         UInt32                                          mBufferSize;
 108         UInt32                                          mFrames;
 109
 110 // don't want to copy these.. can if you want, but more code to write!
 111         AUOutputBL (const AUOutputBL &) {}
 112         AUOutputBL& operator= (const AUOutputBL&) { return *this; }
 113 };
 114
 115 #endif // __AUOutputBL_h__