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/*
File: AUBuffer.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 __AUBuffer_h__
#define __AUBuffer_h__
#include <TargetConditionals.h>
#if !defined(__COREAUDIO_USE_FLAT_INCLUDES__)
#include <AudioUnit/AudioUnit.h>
#else
#include <AudioUnit.h>
#endif
#include <string.h>
#include "CAStreamBasicDescription.h"
#include "CAAutoDisposer.h"
#include "CADebugMacros.h"
// make this usable outside the stricter context of AudiUnits
#ifndef COMPONENT_THROW
#define COMPONENT_THROW(err) \
do { DebugMessage(#err); throw static_cast<OSStatus>(err); } while (0)
#endif
/*! @class AUBufferList */
class AUBufferList {
enum EPtrState {
kPtrsInvalid,
kPtrsToMyMemory,
kPtrsToExternalMemory
};
public:
/*! @ctor AUBufferList */
AUBufferList() : mPtrState(kPtrsInvalid), mExternalMemory(false), mPtrs(NULL), mMemory(NULL),
mAllocatedStreams(0), mAllocatedFrames(0), mAllocatedBytes(0) { }
/*! @dtor ~AUBufferList */
~AUBufferList();
/*! @method PrepareBuffer */
AudioBufferList & PrepareBuffer(const CAStreamBasicDescription &format, UInt32 nFrames);
/*! @method PrepareNullBuffer */
AudioBufferList & PrepareNullBuffer(const CAStreamBasicDescription &format, UInt32 nFrames);
/*! @method SetBufferList */
AudioBufferList & SetBufferList(const AudioBufferList &abl) {
if (mAllocatedStreams < abl.mNumberBuffers)
COMPONENT_THROW(-1);
mPtrState = kPtrsToExternalMemory;
memcpy(mPtrs, &abl, (char *)&abl.mBuffers[abl.mNumberBuffers] - (char *)&abl);
return *mPtrs;
}
/*! @method SetBuffer */
void SetBuffer(UInt32 index, const AudioBuffer &ab) {
if (mPtrState == kPtrsInvalid || index >= mPtrs->mNumberBuffers)
COMPONENT_THROW(-1);
mPtrState = kPtrsToExternalMemory;
mPtrs->mBuffers[index] = ab;
}
/*! @method InvalidateBufferList */
void InvalidateBufferList() { mPtrState = kPtrsInvalid; }
/*! @method GetBufferList */
AudioBufferList & GetBufferList() const {
if (mPtrState == kPtrsInvalid)
COMPONENT_THROW(-1);
return *mPtrs;
}
/*! @method CopyBufferListTo */
void CopyBufferListTo(AudioBufferList &abl) const {
if (mPtrState == kPtrsInvalid)
COMPONENT_THROW(-1);
memcpy(&abl, mPtrs, (char *)&abl.mBuffers[abl.mNumberBuffers] - (char *)&abl);
}
/*! @method CopyBufferContentsTo */
void CopyBufferContentsTo(AudioBufferList &abl) const {
if (mPtrState == kPtrsInvalid)
COMPONENT_THROW(-1);
const AudioBuffer *srcbuf = mPtrs->mBuffers;
AudioBuffer *destbuf = abl.mBuffers;
for (UInt32 i = 0; i < abl.mNumberBuffers; ++i, ++srcbuf, ++destbuf) {
if (i >= mPtrs->mNumberBuffers) // duplicate last source to additional outputs [4341137]
--srcbuf;
if (destbuf->mData != srcbuf->mData)
memmove(destbuf->mData, srcbuf->mData, srcbuf->mDataByteSize);
destbuf->mDataByteSize = srcbuf->mDataByteSize;
}
}
/*! @method Allocate */
void Allocate(const CAStreamBasicDescription &format, UInt32 nFrames);
/*! @method Deallocate */
void Deallocate();
/*! @method UseExternalBuffer */
void UseExternalBuffer(const CAStreamBasicDescription &format, const AudioUnitExternalBuffer &buf);
// AudioBufferList utilities
/*! @method ZeroBuffer */
static void ZeroBuffer(AudioBufferList &abl) {
AudioBuffer *buf = abl.mBuffers;
for (UInt32 i = abl.mNumberBuffers ; i--; ++buf)
memset(buf->mData, 0, buf->mDataByteSize);
}
#if DEBUG
/*! @method PrintBuffer */
static void PrintBuffer(const char *label, int subscript, const AudioBufferList &abl, UInt32 nFrames = 8, bool asFloats = true);
#endif
/*! @method GetAllocatedFrames */
UInt32 GetAllocatedFrames() const { return mAllocatedFrames; }
private:
/*! @ctor AUBufferList */
AUBufferList(AUBufferList &) { } // prohibit copy constructor
/*! @var mPtrState */
EPtrState mPtrState;
/*! @var mExternalMemory */
bool mExternalMemory;
/*! @var mPtrs */
AudioBufferList * mPtrs;
/*! @var mMemory */
Byte * mMemory;
/*! @var mAllocatedStreams */
UInt32 mAllocatedStreams;
/*! @var mAllocatedFrames */
UInt32 mAllocatedFrames;
/*! @var mAllocatedBytes */
UInt32 mAllocatedBytes;
};
// Allocates an array of samples (type T), to be optimally aligned for the processor
/*! @class TAUBuffer */
template <class T>
class TAUBuffer {
public:
enum {
kAlignInterval = 0x10,
kAlignMask = kAlignInterval - 1
};
/*! @ctor TAUBuffer.0 */
TAUBuffer() : mMemObject(NULL), mAlignedBuffer(NULL), mBufferSizeBytes(0)
{
}
/*! @ctor TAUBuffer.1 */
TAUBuffer(UInt32 numElems, UInt32 numChannels) : mMemObject(NULL), mAlignedBuffer(NULL),
mBufferSizeBytes(0)
{
Allocate(numElems, numChannels);
}
/*! @dtor ~TAUBuffer */
~TAUBuffer()
{
Deallocate();
}
/*! @method Allocate */
void Allocate(UInt32 numElems) // can also re-allocate
{
UInt32 reqSize = numElems * sizeof(T);
if (mMemObject != NULL && reqSize == mBufferSizeBytes)
return; // already allocated
mBufferSizeBytes = reqSize;
mMemObject = CA_realloc(mMemObject, reqSize);
UInt32 misalign = (uintptr_t)mMemObject & kAlignMask;
if (misalign) {
mMemObject = CA_realloc(mMemObject, reqSize + kAlignMask);
mAlignedBuffer = (T *)((char *)mMemObject + kAlignInterval - misalign);
} else
mAlignedBuffer = (T *)mMemObject;
}
/*! @method Deallocate */
void Deallocate()
{
if (mMemObject == NULL) return; // so this method has no effect if we're using
// an external buffer
free(mMemObject);
mMemObject = NULL;
mAlignedBuffer = NULL;
mBufferSizeBytes = 0;
}
/*! @method AllocateClear */
void AllocateClear(UInt32 numElems) // can also re-allocate
{
Allocate(numElems);
Clear();
}
/*! @method Clear */
void Clear()
{
memset(mAlignedBuffer, 0, mBufferSizeBytes);
}
// accessors
/*! @method operator T *()@ */
operator T *() { return mAlignedBuffer; }
private:
/*! @var mMemObject */
void * mMemObject; // null when using an external buffer
/*! @var mAlignedBuffer */
T * mAlignedBuffer; // always valid once allocated
/*! @var mBufferSizeBytes */
UInt32 mBufferSizeBytes;
};
#endif // __AUBuffer_h__
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