/*

     File: CAAudioBufferList.h 

 Abstract:  Part of CoreAudio Utility Classes  

  Version: 1.0 

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*/

#if !defined(__CAAudioBufferList_h__)

#define __CAAudioBufferList_h__

//=============================================================================

//  Includes

//=============================================================================

//  System Includes

#if !defined(__COREAUDIO_USE_FLAT_INCLUDES__)

    #include <CoreAudio/CoreAudioTypes.h>

#else

    #include <CoreAudioTypes.h>

#endif

//=============================================================================

//  Types

//=============================================================================

typedef AudioBufferList*    AudioBufferListPtr;

//=============================================================================

//  CAAudioBufferList

//=============================================================================

struct  CAAudioBufferList

{

//  Construction/Destruction

public:

    static AudioBufferList* Create(UInt32 inNumberBuffers);

    static void             Destroy(AudioBufferList* inBufferList);

    static UInt32           CalculateByteSize(UInt32 inNumberBuffers);

//  Operations

public:

    static UInt32           GetTotalNumberChannels(const AudioBufferList& inBufferList);

    static bool             GetBufferForChannel(const AudioBufferList& inBufferList, UInt32 inChannel, UInt32& outBufferNumber, UInt32& outBufferChannel);

    static void             Clear(AudioBufferList& outBufferList);

    static void             Copy(const AudioBufferList& inSource, UInt32 inStartingSourceChannel, AudioBufferList& outDestination, UInt32 inStartingDestinationChannel);

    static void             CopyChannel(const AudioBuffer& inSource, UInt32 inSourceChannel, AudioBuffer& outDestination, UInt32 inDestinationChannel);

    static void             Sum(const AudioBufferList& inSourceBufferList, AudioBufferList& ioSummedBufferList);

    static bool             HasData(AudioBufferList& inBufferList);

#if CoreAudio_Debug

    static void             PrintToLog(const AudioBufferList& inBufferList);

#endif

//  Constants

public:

    static AudioBufferList  sEmptyBufferList;

};

// Declare a variably-sized AudioBufferList on the stack

#define STACK_ABL(name, nbufs) \

    ThrowIf(nbufs < 1 || nbufs > 64, CAException(kAudio_ParamError), "STACK_ABL: invalid number of buffers") \

    const size_t name##_ByteSize = sizeof(AudioBufferList) + (nbufs - 1) * sizeof(AudioBuffer); \

    AudioBufferList &name = *(AudioBufferList *)alloca(name##_ByteSize); \

    name.mNumberBuffers = nbufs;

#endif