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);
}