PublicUtility/CABufferList.cpp
/* |
File: CABufferList.cpp |
Abstract: CABufferList.h |
Version: 1.01 |
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*/ |
#include "CABufferList.h" |
#include "CAByteOrder.h" |
void CABufferList::AllocateBuffers(UInt32 nBytes) |
{ |
if (nBytes <= GetNumBytes()) return; |
if (mABL.mNumberBuffers > 1) |
// align successive buffers for Altivec and to take alternating |
// cache line hits by spacing them by odd multiples of 16 |
nBytes = ((nBytes + 15) & ~15) | 16; |
UInt32 memorySize = nBytes * mABL.mNumberBuffers; |
Byte *newMemory = new Byte[memorySize], *p = newMemory; |
memset(newMemory, 0, memorySize); // get page faults now, not later |
AudioBuffer *buf = mABL.mBuffers; |
for (UInt32 i = mABL.mNumberBuffers; i--; ++buf) { |
if (buf->mData != NULL && buf->mDataByteSize > 0) |
// preserve existing buffer contents |
memcpy(p, buf->mData, buf->mDataByteSize); |
buf->mDataByteSize = nBytes; |
buf->mData = p; |
p += nBytes; |
} |
Byte *oldMemory = mBufferMemory; |
mBufferMemory = newMemory; |
mBufferCapacity = nBytes; |
delete[] oldMemory; |
} |
void CABufferList::AllocateBuffersAndCopyFrom(UInt32 nBytes, CABufferList *inSrcList, CABufferList *inSetPtrList) |
{ |
if (mABL.mNumberBuffers != inSrcList->mABL.mNumberBuffers) return; |
if (mABL.mNumberBuffers != inSetPtrList->mABL.mNumberBuffers) return; |
if (nBytes <= GetNumBytes()) { |
CopyAllFrom(inSrcList, inSetPtrList); |
return; |
} |
inSetPtrList->VerifyNotTrashingOwnedBuffer(); |
UInt32 fromByteSize = inSrcList->GetNumBytes(); |
if (mABL.mNumberBuffers > 1) |
// align successive buffers for Altivec and to take alternating |
// cache line hits by spacing them by odd multiples of 16 |
nBytes = ((nBytes + 15) & ~15) | 16; |
UInt32 memorySize = nBytes * mABL.mNumberBuffers; |
Byte *newMemory = new Byte[memorySize], *p = newMemory; |
memset(newMemory, 0, memorySize); // make buffer "hot" |
AudioBuffer *buf = mABL.mBuffers; |
AudioBuffer *ptrBuf = inSetPtrList->mABL.mBuffers; |
AudioBuffer *srcBuf = inSrcList->mABL.mBuffers; |
for (UInt32 i = mABL.mNumberBuffers; i--; ++buf, ++ptrBuf, ++srcBuf) { |
if (srcBuf->mData != NULL && srcBuf->mDataByteSize > 0) |
// preserve existing buffer contents |
memmove(p, srcBuf->mData, srcBuf->mDataByteSize); |
buf->mDataByteSize = nBytes; |
buf->mData = p; |
ptrBuf->mDataByteSize = srcBuf->mDataByteSize; |
ptrBuf->mData = p; |
p += nBytes; |
} |
Byte *oldMemory = mBufferMemory; |
mBufferMemory = newMemory; |
mBufferCapacity = nBytes; |
if (inSrcList != inSetPtrList) |
inSrcList->BytesConsumed(fromByteSize); |
delete[] oldMemory; |
} |
void CABufferList::DeallocateBuffers() |
{ |
AudioBuffer *buf = mABL.mBuffers; |
for (UInt32 i = mABL.mNumberBuffers; i--; ++buf) { |
buf->mData = NULL; |
buf->mDataByteSize = 0; |
} |
if (mBufferMemory != NULL) { |
delete[] mBufferMemory; |
mBufferMemory = NULL; |
mBufferCapacity = 0; |
} |
} |
static void show(const AudioBufferList &abl, int framesToPrint, int wordSize, const char *label, const char *fmtstr=NULL) |
{ |
printf("%s %p (%d fr%s):\n", label ? label : "AudioBufferList", &abl, framesToPrint, fmtstr ? fmtstr : ""); |
const AudioBuffer *buf = abl.mBuffers; |
for (UInt32 i = 0; i < abl.mNumberBuffers; ++i, ++buf) { |
printf(" [%2d] %5dbytes %dch @ %p", (int)i, (int)buf->mDataByteSize, (int)buf->mNumberChannels, buf->mData); |
if (framesToPrint && buf->mData != NULL) { |
printf(":"); |
Byte *p = (Byte *)buf->mData; |
for (int j = framesToPrint * buf->mNumberChannels; --j >= 0; ) |
switch (wordSize) { |
case 0: // native float |
printf(" %6.3f", *(Float32 *)p); |
p += sizeof(Float32); |
break; |
// positive: big endian |
case 1: |
case -1: |
printf(" %02X", *p); |
p += 1; |
break; |
case 2: |
printf(" %04X", CFSwapInt16BigToHost(*(UInt16 *)p)); |
p += 2; |
break; |
case 3: |
printf(" %06X", (p[0] << 16) | (p[1] << 8) | p[2]); |
p += 3; |
break; |
case 4: |
printf(" %08X", (unsigned int)CFSwapInt32BigToHost(*(UInt32 *)p)); |
p += 4; |
break; |
case 10: |
printf(" %6.3f", CASwapFloat32BigToHost(*(Float32 *)p)); |
p += sizeof(Float32); |
break; |
case -2: |
printf(" %04X", CFSwapInt16LittleToHost(*(UInt16 *)p)); |
p += 2; |
break; |
case -3: |
printf(" %06X", (p[2] << 16) | (p[1] << 8) | p[0]); |
p += 3; |
break; |
case -4: |
printf(" %08X", (unsigned int)CFSwapInt32LittleToHost(*(UInt32 *)p)); |
p += 4; |
break; |
case -10: |
printf(" %6.3f", CASwapFloat32LittleToHost(*(Float32 *)p)); |
p += sizeof(Float32); |
break; |
} |
} |
printf("\n"); |
} |
} |
void CAShowAudioBufferList(const AudioBufferList &abl, int framesToPrint, const AudioStreamBasicDescription &asbd, const char *label) |
{ |
CAStreamBasicDescription fmt(asbd); |
int wordSize = 1; |
char fmtstr[80] = { 0 }; |
if (fmt.mFormatID == kAudioFormatLinearPCM) { |
if (fmt.mFormatFlags & kLinearPCMFormatFlagIsFloat) { |
if (fmt.mBitsPerChannel == 32) { |
if (fmt.mFormatFlags & kLinearPCMFormatFlagIsBigEndian) { |
wordSize = 10; |
strcpy(fmtstr, ", BEF"); |
} else { |
wordSize = -10; |
strcpy(fmtstr, ", LEF"); |
} |
} |
} else { |
wordSize = fmt.SampleWordSize(); |
if (wordSize > 0) { |
int fracbits = (asbd.mFormatFlags & kLinearPCMFormatFlagsSampleFractionMask) >> kLinearPCMFormatFlagsSampleFractionShift; |
if (fracbits > 0) |
sprintf(fmtstr, ", %d.%d-bit", (int)asbd.mBitsPerChannel - fracbits, fracbits); |
else |
sprintf(fmtstr, ", %d-bit", (int)asbd.mBitsPerChannel); |
if (!(fmt.mFormatFlags & kLinearPCMFormatFlagIsBigEndian)) { |
wordSize = -wordSize; |
strcat(fmtstr, " LEI"); |
} else { |
strcat(fmtstr, " BEI"); |
} |
} |
} |
} |
show(abl, framesToPrint, wordSize, label, fmtstr); |
} |
void CAShowAudioBufferList(const AudioBufferList &abl, int framesToPrint, int wordSize, const char *label) |
{ |
show(abl, framesToPrint, wordSize, label); |
} |
extern "C" void CAShowAudioBufferList(const AudioBufferList *abl, int framesToPrint, int wordSize) |
{ |
show(*abl, framesToPrint, wordSize, NULL); |
} |
// if the return result is odd, there was a null buffer. |
extern "C" int CrashIfClientProvidedBogusAudioBufferList(const AudioBufferList *abl, bool nullok) |
{ |
const AudioBuffer *buf = abl->mBuffers, *bufend = buf + abl->mNumberBuffers; |
int sum = 0; // defeat attempts by the compiler to optimize away the code that touches the buffers |
int anyNull = 0; |
for ( ; buf < bufend; ++buf) { |
const int *p = (const int *)buf->mData; |
if (p == NULL) { |
anyNull = 1; |
if (nullok) continue; |
} |
unsigned datasize = buf->mDataByteSize; |
if (datasize >= sizeof(int)) { |
sum += p[0]; |
sum += p[datasize / sizeof(int) - 1]; |
} |
} |
return anyNull | (sum & ~1); |
} |
Copyright © 2012 Apple Inc. All Rights Reserved. Terms of Use | Privacy Policy | Updated: 2012-07-17