PublicUtility/AUOutputBL.cpp
/* |
File: AUOutputBL.cpp |
Abstract: AUOutputBL.h |
Version: 1.01 |
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*/ |
#include "AUOutputBL.h" |
#if !defined(__COREAUDIO_USE_FLAT_INCLUDES__) |
#include <AudioUnit/AUComponent.h> |
#else |
#include <AUComponent.h> |
#endif |
/* |
struct AudioBufferList |
{ |
UInt32 mNumberBuffers; |
AudioBuffer mBuffers[1]; |
}; |
struct AudioBuffer |
{ |
UInt32 mNumberChannels; // number of interleaved channels in the buffer |
UInt32 mDataByteSize; // the size of the buffer pointed to by mData |
void* mData; // the pointer to the buffer |
}; |
*/ |
AUOutputBL::AUOutputBL (const CAStreamBasicDescription &inDesc, UInt32 inDefaultNumFrames) |
: mFormat (inDesc), |
mBufferMemory(NULL), |
mBufferList (NULL), |
mNumberBuffers (0), // keep this here, so can ensure integrity of ABL |
mBufferSize (0), |
mFrames(inDefaultNumFrames) |
{ |
mNumberBuffers = mFormat.IsInterleaved() ? 1 : mFormat.NumberChannels(); |
mBufferList = reinterpret_cast<AudioBufferList*>(new Byte[offsetof(AudioBufferList, mBuffers) + (mNumberBuffers * sizeof(AudioBuffer))]); |
} |
AUOutputBL::~AUOutputBL() |
{ |
if (mBufferMemory) |
delete[] mBufferMemory; |
if (mBufferList) |
delete [] (Byte *)mBufferList; |
} |
void AUOutputBL::Prepare (UInt32 inNumFrames, bool inWantNullBufferIfAllocated) |
{ |
UInt32 channelsPerBuffer = mFormat.IsInterleaved() ? mFormat.NumberChannels() : 1; |
if (mBufferMemory == NULL || inWantNullBufferIfAllocated) |
{ |
mBufferList->mNumberBuffers = mNumberBuffers; |
AudioBuffer *buf = &mBufferList->mBuffers[0]; |
for (UInt32 i = 0; i < mNumberBuffers; ++i, ++buf) { |
buf->mNumberChannels = channelsPerBuffer; |
buf->mDataByteSize = mFormat.FramesToBytes (inNumFrames); |
buf->mData = NULL; |
} |
} |
else |
{ |
UInt32 nBytes = mFormat.FramesToBytes (inNumFrames); |
if ((nBytes * mNumberBuffers) > AllocatedBytes()) |
throw OSStatus(kAudioUnitErr_TooManyFramesToProcess); |
mBufferList->mNumberBuffers = mNumberBuffers; |
AudioBuffer *buf = &mBufferList->mBuffers[0]; |
Byte* p = mBufferMemory; |
for (UInt32 i = 0; i < mNumberBuffers; ++i, ++buf) { |
buf->mNumberChannels = channelsPerBuffer; |
buf->mDataByteSize = nBytes; |
buf->mData = p; |
p += mBufferSize; |
} |
} |
} |
void AUOutputBL::Allocate (UInt32 inNumFrames) |
{ |
if (inNumFrames) |
{ |
UInt32 nBytes = mFormat.FramesToBytes (inNumFrames); |
if (nBytes <= AllocatedBytes()) |
return; |
// align successive buffers for Altivec and to take alternating |
// cache line hits by spacing them by odd multiples of 16 |
if (mNumberBuffers > 1) |
nBytes = (nBytes + (0x10 - (nBytes & 0xF))) | 0x10; |
mBufferSize = nBytes; |
UInt32 memorySize = mBufferSize * mNumberBuffers; |
Byte *newMemory = new Byte[memorySize]; |
memset(newMemory, 0, memorySize); // make buffer "hot" |
Byte *oldMemory = mBufferMemory; |
mBufferMemory = newMemory; |
delete[] oldMemory; |
mFrames = inNumFrames; |
} |
else |
{ |
if (mBufferMemory) { |
delete [] mBufferMemory; |
mBufferMemory = NULL; |
} |
mBufferSize = 0; |
mFrames = 0; |
} |
} |
#if DEBUG |
void AUOutputBL::Print() |
{ |
printf ("AUOutputBL::Print\n"); |
mFormat.Print(); |
printf ("Num Buffers:%d, mFrames:%d, allocatedMemory:%c\n", (int)mBufferList->mNumberBuffers, (int)mFrames, (mBufferMemory != NULL ? 'T' : 'F')); |
AudioBuffer *buf = &mBufferList->mBuffers[0]; |
for (UInt32 i = 0; i < mBufferList->mNumberBuffers; ++i, ++buf) |
printf ("\tBuffer:%d, Size:%d, Chans:%d, Buffer:%p\n", (int)i, (int)buf->mDataByteSize, (int)buf->mNumberChannels, buf->mData); |
} |
#endif |
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