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-/* Copyright: © Copyright 2005 Apple Computer, Inc. All rights reserved.
-
- Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.
- ("Apple") in consideration of your agreement to the following terms, and your
- use, installation, modification or redistribution of this Apple software
- constitutes acceptance of these terms. If you do not agree with these terms,
- please do not use, install, modify or redistribute this Apple software.
-
- In consideration of your agreement to abide by the following terms, and subject
- to these terms, Apple grants you a personal, non-exclusive license, under AppleÕs
- copyrights in this original Apple software (the "Apple Software"), to use,
- reproduce, modify and redistribute the Apple Software, with or without
- modifications, in source and/or binary forms; provided that if you redistribute
- the Apple Software in its entirety and without modifications, you must retain
- this notice and the following text and disclaimers in all such redistributions of
- the Apple Software. Neither the name, trademarks, service marks or logos of
- Apple Computer, Inc. may be used to endorse or promote products derived from the
- Apple Software without specific prior written permission from Apple. Except as
- expressly stated in this notice, no other rights or licenses, express or implied,
- are granted by Apple herein, including but not limited to any patent rights that
- may be infringed by your derivative works or by other works in which the Apple
- Software may be incorporated.
-
- The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
- WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
- WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
- COMBINATION WITH YOUR PRODUCTS.
-
- IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
- GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
- OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
- (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
- ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*/
-/*=============================================================================
- AUOutputBL.h
-
-=============================================================================*/
-
-#ifndef __AUOutputBL_h__
-#define __AUOutputBL_h__
-
-#include "CAStreamBasicDescription.h"
-#if !defined(__COREAUDIO_USE_FLAT_INCLUDES__)
- #include <CoreServices/CoreServices.h>
-#else
- #include <AssertMacros.h>
-#endif
-
-// ____________________________________________________________________________
-//
-// AUOutputBL - Simple Buffer List wrapper targetted to use with retrieving AU output
-// Works in one of two ways (both adjustable)... Can use it with NULL pointers, or allocate
-// memory to receive the data in.
-
-// Before using this with any call to AudioUnitRender, it needs to be Prepared
-// as some calls to AudioUnitRender can reset the ABL
-
-class AUOutputBL {
-public:
-
- // you CANNOT use one of these - it will crash!
-// AUOutputBL ();
-
- // this is the constructor that you use
- // it can't be reset once you've constructed it
- AUOutputBL (const CAStreamBasicDescription &inDesc, UInt32 inDefaultNumFrames = 512);
- ~AUOutputBL();
-
- void Prepare ()
- {
- Prepare (mFrames);
- }
-
- // this version can throw if this is an allocted ABL and inNumFrames is > AllocatedFrames()
- // you can set the bool to true if you want a NULL buffer list even if allocated
- // inNumFrames must be a valid number (will throw if inNumFrames is 0)
- void Prepare (UInt32 inNumFrames, bool inWantNullBufferIfAllocated = false);
-
- AudioBufferList* ABL() { return mBufferList; }
-
- // You only need to call this if you want to allocate a buffer list
- // if you want an empty buffer list, just call Prepare()
- // if you want to dispose previously allocted memory, pass in 0
- // then you either have an empty buffer list, or you can re-allocate
- // Memory is kept around if an Allocation request is less than what is currently allocated
- void Allocate (UInt32 inNumberFrames);
-
- UInt32 AllocatedFrames() const { return mFrames; }
-
- const CAStreamBasicDescription& GetFormat() const { return mFormat; }
-
-#if DEBUG
- void Print();
-#endif
-
-private:
- UInt32 AllocatedBytes () const { return (mBufferSize * mNumberBuffers); }
-
- CAStreamBasicDescription mFormat;
- Byte* mBufferMemory;
- AudioBufferList* mBufferList;
- UInt32 mNumberBuffers;
- UInt32 mBufferSize;
- UInt32 mFrames;
-
-// don't want to copy these.. can if you want, but more code to write!
- AUOutputBL (const AUOutputBL &c) {}
- AUOutputBL& operator= (const AUOutputBL& c) { return *this; }
-};
-
-#endif // __AUOutputBL_h__