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/*
File: AUOutputBL.h
Abstract: Part of CoreAudio Utility Classes
Version: 1.1
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
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 Apple's 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 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.
Copyright (C) 2014 Apple Inc. All Rights Reserved.
*/
#ifndef __AUOutputBL_h__
#define __AUOutputBL_h__
#include "CAStreamBasicDescription.h"
#if !defined(__COREAUDIO_USE_FLAT_INCLUDES__)
#else
#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 () {}
AUOutputBL (const AUOutputBL &c);
AUOutputBL& operator= (const AUOutputBL& c);
};
#endif // __AUOutputBL_h__
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