/*

     File: AudioFileObject.cpp

 Abstract: AudioFileObject.h

  Version: 1.1

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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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*/

#include "AudioFileObject.h"

#include "CADebugMacros.h"

#include <algorithm>

#include <sys/stat.h>

#define kAudioFileNoCacheMask       0x20

const SInt64 kScanToEnd = 0x7fffFFFFffffFFFFLL;

//////////////////////////////////////////////////////////////////////////////////////////////////////////

AudioFileObject::~AudioFileObject()

{

    delete mDataSource;

    DeletePacketTable();

    SetURL(NULL);

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::DoCreate(     

                                    CFURLRef                            inFileRef,

                                    const AudioStreamBasicDescription   *inFormat,

                                    UInt32                              inFlags)

{

    // common prologue

    if (!IsDataFormatValid(inFormat))

        return kAudioFileUnsupportedDataFormatError;

    if (!IsDataFormatSupported(inFormat)) 

        return kAudioFileUnsupportedDataFormatError;

    SetPermissions(kAudioFileReadWritePermission);

    SetAlignDataWithFillerChunks(!(inFlags & 2 /* kAudioFileFlags_DontPageAlignAudioData */ ));

    // call virtual method for particular format.

    return Create(inFileRef, inFormat);

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::Create(       

                                    CFURLRef                            inFileRef,

                                    const AudioStreamBasicDescription   *inFormat)

{

    int fileD;

    OSStatus err = CreateDataFile (inFileRef, fileD);

    FailIf (err != noErr, Bail, "CreateDataFile failed");

    SetURL (inFileRef);

    err = OpenFile(kAudioFileReadWritePermission, fileD);

    FailIf (err != noErr, Bail, "OpenFile failed");

    err = SetDataFormat(inFormat);

    FailIf (err != noErr, Bail, "SetDataFormat failed");

    mIsInitialized = false;

Bail:

    return err;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::DoOpen(   

                                    CFURLRef        inFileRef, 

                                    SInt8           inPermissions,

                                    int             inFD)

{       

    OSStatus err = noErr;

    SetPermissions(inPermissions);

    err = Open(inFileRef, inPermissions, inFD);

    FailIf (err != noErr, Bail, "Open failed");

    err = ValidateFormatAndData();

    FailIf (err != noErr, Bail, "ValidateFormatAndData failed");

Bail:

    return err;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::Open(         

                                    CFURLRef        inFileRef, 

                                    SInt8           inPermissions,

                                    int             inFD)

{       

    if (!(inPermissions & kAudioFileReadPermission))

        return kAudioFilePermissionsError; // file must have read permissions

    SetURL(inFileRef);

    OSStatus err = OpenFile(inPermissions, inFD);

    FailIf (err != noErr, Bail, "OpenFile failed");

    err = OpenFromDataSource();

    FailIf (err != noErr, Bail, "OpenFromDataSource failed");

Bail:

    return err;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::ValidateFormatAndData()

{

    AudioStreamBasicDescription asbd = GetDataFormat();

    if (!IsDataFormatValid(&asbd))

        return kAudioFileInvalidFileError;

    if (asbd.mFormatID == kAudioFormatLinearPCM) 

    {

        SInt64 maxPackets = GetNumBytes() / asbd.mBytesPerPacket;

        if (GetNumPackets() > maxPackets) 

            return kAudioFileInvalidFileError;

    }

    return noErr;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::DoOpenWithCallbacks(

                void *                              inRefCon, 

                AudioFile_ReadProc                  inReadFunc, 

                AudioFile_WriteProc                 inWriteFunc, 

                AudioFile_GetSizeProc               inGetSizeFunc,

                AudioFile_SetSizeProc               inSetSizeFunc)

{

    SInt8   perms = (inSetSizeFunc || inWriteFunc) ? kAudioFileReadWritePermission : kAudioFileReadPermission;

    SetPermissions(perms);

    DataSource* dataSource = new Seekable_DataSource(inRefCon, inReadFunc, inWriteFunc, inGetSizeFunc, inSetSizeFunc);

    SetDataSource(dataSource);

    return OpenFromDataSource();

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::OpenFromDataSource(void)

{       

    return noErr;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::DoInitializeWithCallbacks(

                void *                              inRefCon, 

                AudioFile_ReadProc                  inReadFunc, 

                AudioFile_WriteProc                 inWriteFunc, 

                AudioFile_GetSizeProc               inGetSizeFunc,

                AudioFile_SetSizeProc               inSetSizeFunc,

                UInt32                              inFileType,

                const AudioStreamBasicDescription   *inFormat,

                UInt32                              inFlags)

{       

    DataSource* dataSource = new Seekable_DataSource(inRefCon, inReadFunc, inWriteFunc, inGetSizeFunc, inSetSizeFunc);

    if (!dataSource->CanWrite()) return -54/*permErr*/;

    dataSource->SetSize(0);

    SetDataSource(dataSource);

    SetPermissions(kAudioFileReadWritePermission);

    SetAlignDataWithFillerChunks(!(inFlags & 2 /* kAudioFileFlags_DontPageAlignAudioData */ ));

    OSStatus err = SetDataFormat(inFormat);

    if (err) return err;

    return InitializeDataSource(inFormat, inFlags);

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::DoInitialize( 

                                    CFURLRef                            inFileRef,

                                    const AudioStreamBasicDescription   *inFormat,

                                    UInt32          inFlags)

{

    SetURL (inFileRef);

    SetPermissions(kAudioFileReadWritePermission);

    SetAlignDataWithFillerChunks(!(inFlags & 2 /* kAudioFileFlags_DontPageAlignAudioData */ ));

    return Initialize(inFileRef, inFormat, inFlags);

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::Initialize(   

                                    CFURLRef                            inFileRef,

                                    const AudioStreamBasicDescription   *inFormat,

                                    UInt32                              inFlags)

{

    OSStatus err = noErr;

    UInt8 fPath[FILENAME_MAX];  

    if (!CFURLGetFileSystemRepresentation (inFileRef, true, fPath, FILENAME_MAX))

        return kAudio_FileNotFoundError;

#if TARGET_OS_WIN32

    int filePerms = 0;

    int flags = O_TRUNC | O_RDWR | O_BINARY;

#else

    mode_t filePerms = 0;

    int flags = O_TRUNC | O_RDWR;

#endif

    int fileD = open((const char*)fPath, flags, filePerms);

    if (fileD < 0)

        return AudioFileTranslateErrno(errno);

    err = OpenFile(kAudioFileReadWritePermission, fileD);

    FailIf (err != noErr, Bail, "OpenFile failed");

        // don't need to do this as open has an option to truncate the file

//  GetDataSource()->SetSize(0);

    err = SetDataFormat(inFormat);

    FailIf (err != noErr, Bail, "SetDataFormat failed");

    InitializeDataSource(inFormat, inFlags);

Bail:   

    return err;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::InitializeDataSource(const AudioStreamBasicDescription    *inFormat, UInt32 /*inFlags*/)

{       

    return noErr;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::DoClose()

{

    OSStatus err = UpdateSizeIfNeeded();

    if (err) return err;

    return Close();

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::Close()

{

    try {

        delete mDataSource;

        mDataSource = 0;

    } catch (OSStatus err) {

        return err;

    } catch (...) {

        return kAudioFileUnspecifiedError;

    }

    return noErr;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::Optimize()

{

    // default is that nothing needs to be done. This happens to be true for Raw, SD2 and NeXT/Sun types.

    SetIsOptimized(true); 

    return noErr;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::DoOptimize()

{

    if (!CanWrite()) return kAudioFilePermissionsError;

    OSStatus err = UpdateSizeIfNeeded();

    if (err) return err;

    if (IsOptimized()) return noErr;

    err = Optimize();

    return err;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::UpdateNumBytes(SInt64 inNumBytes) 

{

    OSStatus err = noErr;

    if (inNumBytes != GetNumBytes()) {

        SetNumBytes(inNumBytes);

        // #warning " this will not work for vbr formats"

        SetNumPackets(GetNumBytes() / mDataFormat.mBytesPerPacket);

        SizeChanged();

    }

    return err;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::UpdateNumPackets(SInt64 inNumPackets) 

{

    OSStatus err = noErr;

    if (inNumPackets != GetNumPackets()) {

        // sync current state.

        SetNeedsSizeUpdate(true);

        UpdateSizeIfNeeded();

        SetNumPackets(inNumPackets);

        // #warning " this will not work for vbr formats"

        SetNumBytes(GetNumPackets() * mDataFormat.mBytesPerFrame);

        SizeChanged();

    }

    return err;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::PacketToFrame(SInt64 inPacket, SInt64& outFirstFrameInPacket)

{

    if (mDataFormat.mFramesPerPacket == 0)

    {

        OSStatus err = ScanForPackets(inPacket+1); // the packet count must be one greater than the packet index

        if (err) return err;

        SInt64 packetTableSize = GetPacketTableSize();

        if (mPacketTable && inPacket >= packetTableSize)

            return kAudioFileEndOfFileError;

        CompressedPacketTable* packetTable = GetPacketTable();

        if (!packetTable)

            return kAudioFileInvalidPacketOffsetError;

        if (inPacket < 0 || inPacket >= packetTableSize)

            return kAudioFileInvalidPacketOffsetError;

        outFirstFrameInPacket = (*packetTable)[(size_t)inPacket].mFrameOffset;

    }

    else

    {

        outFirstFrameInPacket = inPacket * mDataFormat.mFramesPerPacket;

    }

    return noErr;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::FrameToPacket(SInt64 inFrame, SInt64& outPacket, UInt32& outFrameOffsetInPacket)

{

    if (mDataFormat.mFramesPerPacket == 0)

    {

        CompressedPacketTable* packetTable = GetPacketTable();

        if (!packetTable)

            return kAudioFileInvalidPacketOffsetError;

        // search packet table

        AudioStreamPacketDescriptionExtended pext;

        memset(&pext, 0, sizeof(pext));

        pext.mFrameOffset = inFrame;

        CompressedPacketTable::iterator iter = std::lower_bound(packetTable->begin(), packetTable->end(), pext);

        if (iter == packetTable->end())

            return kAudioFileInvalidPacketOffsetError;

        if (iter > packetTable->begin()) --iter;

        outPacket = iter - packetTable->begin();

        outFrameOffsetInPacket = (UInt32)(inFrame - iter->mFrameOffset);

    }

    else

    {

        outPacket = inFrame / mDataFormat.mFramesPerPacket;

        outFrameOffsetInPacket = (UInt32)(inFrame % mDataFormat.mFramesPerPacket);

    }

    return noErr;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::PacketToByte(AudioBytePacketTranslation* abpt)

{

    if (abpt->mPacket < 0)

        return kAudioFileInvalidPacketOffsetError;

    if (mDataFormat.mBytesPerPacket == 0)

    {

        CompressedPacketTable* packetTable = GetPacketTable();

        if (!packetTable)

            return kAudioFileInvalidPacketOffsetError;

        if (abpt->mPacket < GetPacketTableSize()) {

            abpt->mByte = (*packetTable)[(int)abpt->mPacket].mStartOffset;

            abpt->mFlags = 0;

        } else {

            SInt64 numPackets = packetTable->size();

            if (numPackets < 8) 

                return 'more' /*kAudioFileStreamError_DataUnavailable*/ ;

            const AudioStreamPacketDescriptionExtended lastPacket = (*packetTable)[numPackets - 1];

            SInt64 bytesReadSoFar = lastPacket.mStartOffset + lastPacket.mDataByteSize;

            double averageBytesPerPacket = (double)(bytesReadSoFar - GetDataOffset()) / (double)numPackets;

            abpt->mByte = (SInt64)floor((double)abpt->mPacket * averageBytesPerPacket);

            abpt->mFlags = kBytePacketTranslationFlag_IsEstimate;

        }

    }

    else

    {

        abpt->mByte = abpt->mPacket * mDataFormat.mBytesPerPacket;

        abpt->mFlags = 0;

    }

    return noErr;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

inline bool byte_less_than (const AudioStreamPacketDescriptionExtended& a, const AudioStreamPacketDescriptionExtended& b)

{

    return a.mStartOffset < b.mStartOffset;

}

OSStatus AudioFileObject::ByteToPacket(AudioBytePacketTranslation* abpt)

{

    if (abpt->mByte < 0)

        return kAudioFileInvalidPacketOffsetError;

    if (mDataFormat.mBytesPerPacket == 0)

    {

        CompressedPacketTable* packetTable = GetPacketTable();

        if (!packetTable)

            return kAudioFileInvalidPacketOffsetError;

            // search packet table

        AudioStreamPacketDescriptionExtended pext;

        memset(&pext, 0, sizeof(pext));

        pext.mStartOffset = abpt->mByte;

        CompressedPacketTable::iterator iter = std::lower_bound(packetTable->begin(), packetTable->end(), pext, byte_less_than);

        if (iter == packetTable->end()) {

            SInt64 numPackets = packetTable->size();

            if (numPackets < 8) 

                return 'more' /*kAudioFileStreamError_DataUnavailable*/ ;

            const AudioStreamPacketDescriptionExtended lastPacket = (*packetTable)[numPackets - 1];

            SInt64 bytesReadSoFar = lastPacket.mStartOffset + lastPacket.mDataByteSize;

            double averageBytesPerPacket = (double)(bytesReadSoFar - GetDataOffset()) / (double)numPackets;

            double fpacket = (double)abpt->mByte / averageBytesPerPacket;

            abpt->mPacket = (SInt64)floor(fpacket);

            abpt->mByteOffsetInPacket = (UInt32)floor((fpacket - (double)abpt->mPacket) * averageBytesPerPacket);

            abpt->mFlags = kBytePacketTranslationFlag_IsEstimate;

        } else {

            if (iter > packetTable->begin()) --iter;

            abpt->mPacket = iter - packetTable->begin();

            abpt->mByteOffsetInPacket = (UInt32)(abpt->mByte - iter->mStartOffset);

            abpt->mFlags = 0;

        }

    }

    else

    {

        abpt->mPacket = abpt->mByte / mDataFormat.mBytesPerPacket;

        abpt->mByteOffsetInPacket = (UInt32)(abpt->mByte % mDataFormat.mBytesPerPacket);

        abpt->mFlags = 0;

    }

    return noErr;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::ReadBytes(        

                                Boolean         inUseCache,

                                SInt64          inStartingByte, 

                                UInt32          *ioNumBytes, 

                                void            *outBuffer)

{

    OSStatus        err = noErr;

    UInt16          mode = SEEK_SET;

    SInt64          fileOffset = mDataOffset + inStartingByte;

    bool            readingPastEnd = false;

    FailWithAction((ioNumBytes == NULL) || (outBuffer == NULL), err = kAudio_ParamError, 

        Bail, "invalid num bytes parameter");

    //printf("inStartingByte %lld  GetNumBytes %lld\n", inStartingByte, GetNumBytes());

    if (inStartingByte >= GetNumBytes()) 

    {

        *ioNumBytes = 0;

        return kAudioFileEndOfFileError;

    }

    if ((fileOffset + *ioNumBytes) > (GetNumBytes() + mDataOffset)) 

    {

        *ioNumBytes = (UInt32)(GetNumBytes() + mDataOffset - fileOffset);

        readingPastEnd = true;

    }

    //printf("fileOffset %lld  mDataOffset %lld  readingPastEnd %d\n", fileOffset, mDataOffset, readingPastEnd);

    if (!inUseCache)

        mode |= kAudioFileNoCacheMask;

    err = GetDataSource()->ReadBytes(mode, fileOffset, *ioNumBytes, outBuffer, ioNumBytes);

    if (readingPastEnd && err == noErr)

        err = kAudioFileEndOfFileError;

Bail:

    return err;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::WriteBytes(   

                                Boolean         inUseCache,

                                SInt64          inStartingByte, 

                                UInt32          *ioNumBytes, 

                                const void      *inBuffer)

{

    OSStatus        err = noErr;

    UInt16          mode = SEEK_SET;

    bool            extendingTheAudioData;

    if (!CanWrite()) return kAudioFilePermissionsError;

    FailWithAction((ioNumBytes == NULL) || (inBuffer == NULL), err = kAudioFileUnspecifiedError, Bail, "invalid parameters");

    // Do not try to write to a postion greater than 32 bits for some file types

    // see if starting byte + ioNumBytes is greater than 32 bits

    // if so, see if file type supports this and bail if not

    err = IsValidFilePosition(inStartingByte + *ioNumBytes);

    FailIf(err != noErr, Bail, "invalid file position");

    extendingTheAudioData = inStartingByte + *ioNumBytes > GetNumBytes();

    // if file is not optimized, then do not write data that would overwrite chunks following the sound data chunk

    FailWithAction( extendingTheAudioData && !IsOptimized(), 

                    err = kAudioFileNotOptimizedError, Bail, "Can't write more data until the file is optimized");

    if (!inUseCache)

        mode |= kAudioFileNoCacheMask;

    err = GetDataSource()->WriteBytes(mode, mDataOffset + inStartingByte, *ioNumBytes, 

                        inBuffer, ioNumBytes);

    FailIf(err != noErr, Bail, "couldn't write new data");

    if (extendingTheAudioData) {

        SInt64      nuEOF;                      // Get the total bytes of audio data

        SInt64      nuByteTotal;

        err = GetDataSource()->GetSize(nuEOF);

        FailIf(err != noErr, Bail, "GetSize failed");

        nuByteTotal = nuEOF - mDataOffset;

        err = UpdateNumBytes(nuByteTotal);

    }

Bail:

    return err;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::ReadPackets(  

                                Boolean                         inUseCache,

                                UInt32                          *outNumBytes,

                                AudioStreamPacketDescription    *outPacketDescriptions,

                                SInt64                          inStartingPacket, 

                                UInt32                          *ioNumPackets, 

                                void                            *outBuffer)

{

    // This only works with CBR. To suppport VBR you must override.

    OSStatus        err = noErr;

    FailWithAction(outBuffer == NULL, err = kAudio_ParamError, Bail, "NULL buffer");

    FailWithAction((ioNumPackets == NULL) || (*ioNumPackets < 1), err = kAudio_ParamError, Bail, "invalid num packets parameter");

    {

        UInt32          byteCount = *ioNumPackets * mDataFormat.mBytesPerPacket;

        SInt64          startingByte = inStartingPacket * mDataFormat.mBytesPerPacket;

        err = ReadBytes (inUseCache, startingByte, &byteCount, outBuffer);

        if ((err == noErr) || (err == kAudioFileEndOfFileError))

        {

            if (byteCount != (*ioNumPackets * mDataFormat.mBytesPerPacket))

            {

                *ioNumPackets = byteCount / mDataFormat.mBytesPerPacket;

                byteCount = *ioNumPackets * mDataFormat.mBytesPerPacket;

            }

            if (outNumBytes)

                *outNumBytes = byteCount;

            if (err == kAudioFileEndOfFileError)

                err = noErr;

        }

    }

Bail:

    return err;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::ReadPacketData(   

                                Boolean                         inUseCache,

                                UInt32                          *ioNumBytes,

                                AudioStreamPacketDescription    *outPacketDescriptions,

                                SInt64                          inStartingPacket, 

                                UInt32                          *ioNumPackets, 

                                void                            *outBuffer)

{

    OSStatus        err = noErr;

    FailWithAction(ioNumPackets == NULL || *ioNumPackets < 1, err = kAudio_ParamError, Bail, "invalid ioNumPackets parameter");

    FailWithAction(ioNumBytes   == NULL || *ioNumBytes   < 1, err = kAudio_ParamError, Bail, "invalid ioNumBytes parameter");

    if (mDataFormat.mBytesPerPacket) {

        // CBR

        FailWithAction(outBuffer    == NULL, err = kAudio_ParamError, Bail, "NULL buffer");

        UInt32 maxPackets = *ioNumBytes / mDataFormat.mBytesPerPacket;

        if (*ioNumPackets > maxPackets) *ioNumPackets = maxPackets;

        if (outBuffer) {

            UInt32 byteCount = *ioNumPackets * mDataFormat.mBytesPerPacket;

            SInt64 startingByte = inStartingPacket * mDataFormat.mBytesPerPacket;

            err = ReadBytes (inUseCache, startingByte, &byteCount, outBuffer);

            if (err == noErr || err == kAudioFileEndOfFileError) {

                if (byteCount != (*ioNumPackets * mDataFormat.mBytesPerPacket)) {

                    *ioNumPackets = byteCount / mDataFormat.mBytesPerPacket;

                    byteCount = *ioNumPackets * mDataFormat.mBytesPerPacket;

                }

                *ioNumBytes = byteCount;

            }

        }

    } else {

        FailWithAction(outPacketDescriptions   == NULL, err = kAudio_ParamError, Bail, "invalid outPacketDescriptions parameter");

        err = ReadPacketDataVBR(inUseCache, ioNumBytes, outPacketDescriptions, inStartingPacket, ioNumPackets, outBuffer);

    }

Bail:

    return err;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::ReadPacketDataVBR(    

                                Boolean                         inUseCache,

                                UInt32                          *ioNumBytes,

                                AudioStreamPacketDescription    *outPacketDescriptions,

                                SInt64                          inStartingPacket, 

                                UInt32                          *ioNumPackets, 

                                void                            *outBuffer)

{

    OSStatus err = ScanForPackets(inStartingPacket+1); // need to scan packets up to start

    if (err && err != kAudioFileEndOfFileError)

        return err;

    SInt64 dataOffset = GetDataOffset();

    CompressedPacketTable* packetTable = GetPacketTable();

    if (!packetTable) 

        return kAudioFileInvalidFileError;

    SInt64 packetTableSize = GetPacketTableSize();

    if (inStartingPacket >= packetTableSize) {

        *ioNumBytes = 0;

        *ioNumPackets = 0;

        return kAudioFileEndOfFileError;

    }

    if (inStartingPacket + *ioNumPackets <= packetTableSize) {

        err = ReadPacketDataVBR_InTable(inUseCache, ioNumBytes, outPacketDescriptions, inStartingPacket, ioNumPackets, outBuffer);

    } else {

        AudioStreamPacketDescription firstPacket = (*packetTable)[inStartingPacket];

        SInt64 firstPacketOffset = firstPacket.mStartOffset;

        UInt32 bytesRead = *ioNumBytes;

        SInt64 fileSize = 0;

        GetDataSource()->GetSize(fileSize);

        SInt64 remainingBytesInFile = fileSize - firstPacketOffset - dataOffset;

        if (bytesRead > remainingBytesInFile)

            bytesRead = (UInt32)remainingBytesInFile;

        err = ReadBytes (inUseCache, firstPacketOffset, &bytesRead, outBuffer);

        if (err && err != kAudioFileEndOfFileError) {

            *ioNumBytes = 0;

            *ioNumPackets = 0;

            return err;

        }

        Buffer_DataSource bufSrc(bytesRead, outBuffer, dataOffset + firstPacketOffset);

        OSStatus scanErr = ScanForPackets(kScanToEnd, &bufSrc, false);

        if (scanErr && scanErr != kAudioFileEndOfFileError)

            return scanErr;

        packetTableSize = packetTable->size();

        UInt32 numPacketsRead = 0;

        UInt32 endOfData = 0;

        SInt64 packetNumber = inStartingPacket;

        for (; numPacketsRead < *ioNumPackets && packetNumber < packetTableSize; ++numPacketsRead, ++packetNumber) {

            AudioStreamPacketDescription curPacket = (*packetTable)[numPacketsRead + inStartingPacket];

            SInt64 curPacketOffset = curPacket.mStartOffset - firstPacketOffset;

            SInt64 endOfPacket = curPacketOffset + curPacket.mDataByteSize;

            if (endOfPacket > bytesRead) break;

            endOfData = (UInt32)endOfPacket;

            outPacketDescriptions[numPacketsRead] = curPacket;              

            outPacketDescriptions[numPacketsRead].mStartOffset = curPacketOffset;

        }

        *ioNumBytes = endOfData;

        *ioNumPackets = numPacketsRead;

    }

    return err;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::HowManyPacketsCanBeReadIntoBuffer(UInt32* ioNumBytes, SInt64 inStartingPacket, UInt32 *ioNumPackets)

{       

    CompressedPacketTable*  packetTable = GetPacketTable();

    SInt64 packetTableSize = GetPacketTableSize();

    if (inStartingPacket + *ioNumPackets > (SInt64)packetTableSize) {

        *ioNumPackets = (UInt32)(packetTableSize - inStartingPacket);

    }

    AudioStreamPacketDescription firstPacket = (*packetTable)[inStartingPacket];

    if (*ioNumBytes < firstPacket.mDataByteSize) {

        *ioNumBytes = 0;

        *ioNumPackets = 0;

        return kAudio_ParamError;

    }

    SInt64 lastPacketIndex = inStartingPacket + *ioNumPackets - 1;

    if (lastPacketIndex >= packetTableSize) 

        lastPacketIndex = packetTableSize - 1;

    AudioStreamPacketDescription lastPacket = (*packetTable)[lastPacketIndex];

    SInt64 readBytes = lastPacket.mStartOffset + lastPacket.mDataByteSize - firstPacket.mStartOffset;

    if (readBytes <= *ioNumBytes) {

        *ioNumBytes = (UInt32)readBytes;

        return noErr;

    }

    SInt64 lowBound = inStartingPacket;

    SInt64 highBound = lastPacketIndex + 1;

    SInt64 okIndex = lowBound;

    while (highBound >= lowBound) {     

        SInt64 tryBound = (lowBound + highBound) >> 1;

        if (tryBound > lastPacketIndex) 

            break;

        AudioStreamPacketDescription tryPacket = (*packetTable)[tryBound];

        SInt64 readBytes = tryPacket.mStartOffset + tryPacket.mDataByteSize - firstPacket.mStartOffset;

        if (readBytes > (SInt64)*ioNumBytes) {

            highBound = tryBound - 1;

        } else if (readBytes < (SInt64)*ioNumBytes) {

            okIndex = tryBound;

            lowBound = tryBound + 1;

        } else {

            okIndex = tryBound;

            break;

        }

    }   

    SInt64 numPackets = okIndex - inStartingPacket + 1;

    if (numPackets > *ioNumPackets) {

        numPackets = *ioNumPackets;

        okIndex = inStartingPacket + numPackets - 1;

    }

    AudioStreamPacketDescription packet = (*packetTable)[okIndex];

    *ioNumBytes = (UInt32)(packet.mStartOffset + packet.mDataByteSize - firstPacket.mStartOffset);

    *ioNumPackets = (UInt32)numPackets;

    return noErr;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::ReadPacketDataVBR_InTable(    

                                Boolean                         inUseCache,

                                UInt32                          *ioNumBytes,

                                AudioStreamPacketDescription    *outPacketDescriptions,

                                SInt64                          inStartingPacket, 

                                UInt32                          *ioNumPackets, 

                                void                            *outBuffer)

{

    CompressedPacketTable* packetTable = GetPacketTable();

    if (!packetTable) 

        return kAudioFileInvalidFileError;

    OSStatus err = HowManyPacketsCanBeReadIntoBuffer(ioNumBytes, inStartingPacket, ioNumPackets);

    if (err) return err;

    AudioStreamPacketDescription firstPacket = (*packetTable)[inStartingPacket];

    SInt64 firstPacketOffset = firstPacket.mStartOffset;

    UInt32 bytesRead = *ioNumBytes;

    if (outBuffer) {

        err = ReadBytes (inUseCache, firstPacketOffset, &bytesRead, outBuffer);

        if (err && err != kAudioFileEndOfFileError) {

            *ioNumBytes = 0;

            *ioNumPackets = 0;

            return err;

        }

        *ioNumBytes = bytesRead;

    }

    // fill out packet descriptions

    if (outPacketDescriptions) {                        

        for (UInt32 i = 0; i < *ioNumPackets; i++) {

            AudioStreamPacketDescription curPacket = (*packetTable)[i + inStartingPacket];

            outPacketDescriptions[i] = curPacket;               

            outPacketDescriptions[i].mStartOffset = curPacket.mStartOffset - firstPacketOffset;

        }

    }

    return err;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::WritePackets( 

                                    Boolean                             inUseCache,

                                    UInt32                              inNumBytes,

                                    const AudioStreamPacketDescription  *inPacketDescriptions,

                                    SInt64                              inStartingPacket, 

                                    UInt32                              *ioNumPackets, 

                                    const void                          *inBuffer)

{

    // This only works with CBR. To suppport VBR you must override.

    OSStatus        err = noErr;

    FailWithAction(inStartingPacket > GetNumPackets(), err = kAudioFileInvalidPacketOffsetError, Bail, "write past end");

    FailWithAction((ioNumPackets == NULL) || (inBuffer == NULL), err = kAudioFileUnspecifiedError, Bail, "invalid parameter");

    {

        UInt32 byteCount = *ioNumPackets * mDataFormat.mBytesPerPacket;

        SInt64 startingByte = inStartingPacket * mDataFormat.mBytesPerPacket;

        err = WriteBytes(inUseCache, startingByte, &byteCount, inBuffer);

        FailIf (err != noErr, Bail, "Write Bytes Failed");

        if (byteCount != (*ioNumPackets * mDataFormat.mBytesPerPacket))

            *ioNumPackets = byteCount / mDataFormat.mBytesPerPacket;

    }

Bail:

    return (err);

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::GetBitRate(           UInt32                  *outBitRate)

{

    if (!outBitRate) return kAudioFileUnspecifiedError;

    UInt32 bytesPerPacket = GetDataFormat().mBytesPerPacket;

    UInt32 framesPerPacket = GetDataFormat().mFramesPerPacket;

    Float64 sampleRate = GetDataFormat().mSampleRate;

    const Float64 bitsPerByte = 8.;

    if (bytesPerPacket && framesPerPacket) {

        *outBitRate = (UInt32)(bitsPerByte * (Float64)bytesPerPacket * sampleRate / (Float64)framesPerPacket);

    } else {        

        SInt64 numPackets = GetNumPackets();

        SInt64 numBytes = GetNumBytes();

        SInt64 numFrames = 0;

        if (framesPerPacket) {

            numFrames = numPackets * framesPerPacket;

        } else {

            // count frames

            CompressedPacketTable* packetTable = GetPacketTable();

            if (packetTable) {

                if (packetTable->size() != numPackets) {

                    return kAudioFileInvalidFileError;

                }

#if !TARGET_OS_WIN32

                for (ssize_t i = 0; i < numPackets; i++)

#else

                for (int i = 0; i < numPackets; i++)

#endif

                {

                    numFrames += (*packetTable)[i].mVariableFramesInPacket;

                }       

            } else {

                return kAudioFileUnsupportedPropertyError;

            }

        }

        if (numFrames == 0 || (sampleRate == 0.)) {

            *outBitRate = 0;

            return noErr;

        }

        Float64 duration = (Float64)numFrames / sampleRate;

        *outBitRate = (UInt32)(bitsPerByte * (Float64)numBytes / duration);

    }

    return noErr;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::GetMagicCookieDataSize(

                                                UInt32                  *outDataSize,

                                                UInt32                  *isWritable)

{

    if (outDataSize)  *outDataSize = 0;

    if (isWritable)  *isWritable = 0;

    return kAudioFileUnsupportedPropertyError;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::GetMagicCookieData(

                                                UInt32                  *ioDataSize,

                                                void                    *ioPropertyData)

{

    *ioDataSize = 0;

    return kAudioFileUnsupportedPropertyError;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::SetMagicCookieData(   UInt32                  /*inDataSize*/,

                                                const void              *inPropertyData)

{

    return kAudioFileInvalidChunkError;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::GetMarkerListSize(

                                                UInt32                  *outDataSize,

                                                UInt32                  *isWritable)

{

    if (outDataSize) *outDataSize = 0;

    if (isWritable) *isWritable = 0;

    return kAudioFileUnsupportedPropertyError;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::GetMarkerList(

                                                UInt32                  *ioDataSize,

                                                AudioFileMarkerList*    /*ioPropertyData*/)

{

    *ioDataSize = 0;

    return kAudioFileUnsupportedPropertyError;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::SetMarkerList(    UInt32                      /*inDataSize*/,

                                            const AudioFileMarkerList*  /*inPropertyData*/)

{

    return kAudioFileUnsupportedPropertyError;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::GetRegionListSize(

                                                UInt32                  *outDataSize,

                                                UInt32                  *isWritable)

{

    if (outDataSize) *outDataSize = 0;

    if (isWritable) *isWritable = 0;

    return kAudioFileUnsupportedPropertyError;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::GetRegionList(

                                                UInt32                  *ioDataSize,

                                                AudioFileRegionList     *ioPropertyData)

{

    *ioDataSize = 0;

    return kAudioFileUnsupportedPropertyError;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::SetRegionList(    UInt32                      /*inDataSize*/,

                                            const AudioFileRegionList*   /*inPropertyData*/)

{

    return kAudioFileUnsupportedPropertyError;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::GetChannelLayoutSize(

                                                UInt32                  *outDataSize,

                                                UInt32                  *isWritable)

{

    if (outDataSize) *outDataSize = 0;

    if (isWritable) *isWritable = 0;

    return kAudioFileUnsupportedPropertyError;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::GetChannelLayout(

                                                UInt32                      *ioDataSize,

                                                AudioChannelLayout*         /*ioPropertyData*/)

{

    *ioDataSize = 0;

    return kAudioFileUnsupportedPropertyError;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::SetChannelLayout( UInt32                      /*inDataSize*/,

                                            const AudioChannelLayout*   /*inPropertyData*/)

{

    return kAudioFileUnsupportedPropertyError;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::GetInfoDictionarySize(        UInt32                      *outDataSize,

                                    UInt32                      *isWritable)

{

    if (outDataSize) *outDataSize = sizeof(CFDictionaryRef);

    if (isWritable) *isWritable = 0;

    return noErr;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::GetInfoDictionary(CACFDictionary  *infoDict)

{   

    Float64 fl;

    if (GetEstimatedDuration(&fl) == noErr)

        return AddDurationToInfoDictionary(infoDict, fl);

    return kAudioFileUnsupportedPropertyError;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::SetInfoDictionary(CACFDictionary *infoDict)

{

    return kAudioFileUnsupportedPropertyError;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::GetEstimatedDuration(Float64*     duration)

{

    // calculate duration

    AudioStreamBasicDescription     ASBD = GetDataFormat();

    *duration  = (ASBD.mFramesPerPacket != 0) ? (GetNumPackets() * ASBD.mFramesPerPacket) / ASBD.mSampleRate : 0.0;

    /*

        For now, assume that any ASBD that has zero in the frames per packet field has been subclassed for this

        method. i.e. A CAF file has a frame count in one of it's chunks.

        MP3 has been subclassed because it guesstimates a duration so the entire file does not 

        need to be parsed in order to calculate the total frames.

    */

    return noErr;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::GetPropertyInfo   (   

                                        AudioFilePropertyID     inPropertyID,

                                        UInt32                  *outDataSize,

                                        UInt32                  *isWritable)

{

    OSStatus        err = noErr;

    UInt32          writable = 0;

    switch (inPropertyID)

    {

        case kAudioFilePropertyDeferSizeUpdates :

            if (outDataSize) *outDataSize = sizeof(UInt32);

            writable = 1;

            break;

        case kAudioFilePropertyFileFormat:

            if (outDataSize) *outDataSize = sizeof(UInt32);

            writable = 0;

            break;

        case kAudioFilePropertyDataFormat:

            if (outDataSize) *outDataSize = sizeof(AudioStreamBasicDescription);

            writable = 1;

            break;

        case kAudioFilePropertyFormatList:

            err = GetFormatListInfo(*outDataSize, writable);

            break;

        case kAudioFilePropertyPacketSizeUpperBound:

        case kAudioFilePropertyIsOptimized:

        case kAudioFilePropertyMaximumPacketSize:

            if (outDataSize) *outDataSize = sizeof(UInt32);

            writable = 0;

            break;

        case kAudioFilePropertyAudioDataByteCount:

        case kAudioFilePropertyAudioDataPacketCount:

            writable = 1;

            if (outDataSize) *outDataSize = sizeof(SInt64);

            break;

        case kAudioFilePropertyDataOffset:

            writable = 0;

            if (outDataSize) *outDataSize = sizeof(SInt64);

            break;

        case kAudioFilePropertyBitRate:            

            writable = 0;

            if (outDataSize) *outDataSize = sizeof(UInt32);

            break;

        case kAudioFilePropertyMagicCookieData:            

            err = GetMagicCookieDataSize(outDataSize, &writable);

            break;

        case kAudioFilePropertyMarkerList :

            err = GetMarkerListSize(outDataSize, &writable);            

            break;

        case kAudioFilePropertyRegionList :

            err = GetRegionListSize(outDataSize, &writable);            

            break;

        case kAudioFilePropertyChannelLayout :

            err = GetChannelLayoutSize(outDataSize, &writable);         

            break;

        case kAudioFilePropertyPacketToFrame :

        case kAudioFilePropertyFrameToPacket :

            if (outDataSize) *outDataSize = sizeof(AudioFramePacketTranslation);

            writable = 0;

            break;

        case kAudioFilePropertyPacketToByte :

        case kAudioFilePropertyByteToPacket :

            if (outDataSize) *outDataSize = sizeof(AudioBytePacketTranslation);

            writable = 0;

            break;

        case kAudioFilePropertyInfoDictionary :

            err = GetInfoDictionarySize(outDataSize, &writable);            

            break;

        case kTEMPAudioFilePropertySoundCheckDictionary :

            err = GetSoundCheckDictionarySize(outDataSize, &writable);          

            break;

        case kTEMPAudioFilePropertyGenerateLoudnessInfo :

            err = GetLoudnessInfoSize(outDataSize, &writable);

            writable = 0;

            break;

        case kTEMPAudioFilePropertyLoudnessInfo :

            err = GetLoudnessInfoSize(outDataSize, &writable);

            break;

        case kAudioFilePropertyEstimatedDuration :

            if (outDataSize) *outDataSize = sizeof(Float64);

            writable = 0;

            break;

        case 'LYRC':

            if (outDataSize) *outDataSize = sizeof(CFStringRef);

            if (isWritable) *isWritable = 0;

            break;

        case 'eof?':

            if (outDataSize) *outDataSize = sizeof(UInt32);

            if (isWritable) *isWritable = 0;

            break;

        case 'sbtd' /*kAudioFilePropertySourceBitDepth*/ :

            if (outDataSize) *outDataSize = sizeof(SInt32);

            if (isWritable) *isWritable = CanWrite();

            break;

        default:

            writable = 0;

            err = kAudioFileUnsupportedPropertyError;

            break;

    }

    if (isWritable)

        *isWritable = writable;

    return (err);

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus    AudioFileObject::GetProperty(

                                    AudioFilePropertyID     inPropertyID,

                                    UInt32                  *ioDataSize,

                                    void                    *ioPropertyData)

{

    OSStatus        err = noErr;

    UInt32          neededSize;

    UInt32          writable;

    switch (inPropertyID)

    {

        case kAudioFilePropertyFileFormat:

            FailWithAction(*ioDataSize != sizeof(UInt32), 

                err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            *(UInt32 *) ioPropertyData = GetFileType();

            break;

        case kAudioFilePropertyFormatList:

            err = GetFormatList(*ioDataSize, (AudioFormatListItem*)ioPropertyData);

            break;

        case kAudioFilePropertyDataFormat:

            FailWithAction(*ioDataSize != sizeof(AudioStreamBasicDescription), 

                err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            memcpy(ioPropertyData, &mDataFormat, sizeof(AudioStreamBasicDescription));

            break;

        case kAudioFilePropertyDataOffset:

            FailWithAction(*ioDataSize != sizeof(SInt64), 

                err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            *(SInt64 *) ioPropertyData = mDataOffset;

            break;

        case kAudioFilePropertyIsOptimized:

            FailWithAction(*ioDataSize != sizeof(UInt32), 

                err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            *(UInt32 *) ioPropertyData = mIsOptimized;

            break;

        case kAudioFilePropertyAudioDataByteCount:

            FailWithAction(*ioDataSize != sizeof(SInt64), 

                err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            *(SInt64 *)ioPropertyData = GetNumBytes();

            break;

        case kAudioFilePropertyAudioDataPacketCount:

            FailWithAction(*ioDataSize != sizeof(SInt64), 

                err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            *(SInt64 *)ioPropertyData = GetNumPackets();

            break;

        case kAudioFilePropertyPacketSizeUpperBound:

            FailWithAction(*ioDataSize != sizeof(UInt32), 

                err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            *(UInt32 *)ioPropertyData = GetPacketSizeUpperBound();

            break;

        case kAudioFilePropertyMaximumPacketSize:

            FailWithAction(*ioDataSize != sizeof(UInt32), 

                err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            *(UInt32 *)ioPropertyData = FindMaximumPacketSize();

            break;

         case kAudioFilePropertyBitRate:            

            FailWithAction(*ioDataSize != sizeof(UInt32), 

                err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            err = GetBitRate((UInt32*)ioPropertyData);

            break;

         case kAudioFilePropertyMagicCookieData:            

            err = GetMagicCookieData(ioDataSize, ioPropertyData);

            break;

        case kAudioFilePropertyMarkerList :

            err = GetMarkerList(ioDataSize, static_cast<AudioFileMarkerList*>(ioPropertyData));         

            break;

        case kAudioFilePropertyRegionList :

            memset(ioPropertyData, 0, *ioDataSize);

            err = GetRegionList(ioDataSize, static_cast<AudioFileRegionList*>(ioPropertyData));         

            break;

        case kAudioFilePropertyChannelLayout :

            err = GetChannelLayoutSize(&neededSize, &writable);

            FailIf(err, Bail, "GetChannelLayoutSize failed");

            FailWithAction(*ioDataSize != neededSize, err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            err = GetChannelLayout(ioDataSize, static_cast<AudioChannelLayout*>(ioPropertyData));           

            break;

        case kAudioFilePropertyDeferSizeUpdates :

            FailWithAction(*ioDataSize != sizeof(UInt32), 

                err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            *(UInt32 *) ioPropertyData = DeferSizeUpdates();

            break;

        case kAudioFilePropertyPacketToFrame : 

        {

            FailWithAction(*ioDataSize != sizeof(AudioFramePacketTranslation), 

                err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            AudioFramePacketTranslation* afpt = (AudioFramePacketTranslation*)ioPropertyData;

            err = PacketToFrame(afpt->mPacket, afpt->mFrame);

            break;

        }   

        case kAudioFilePropertyFrameToPacket :

        {

            FailWithAction(*ioDataSize != sizeof(AudioFramePacketTranslation), 

                err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            AudioFramePacketTranslation* afpt = (AudioFramePacketTranslation*)ioPropertyData;

            err = FrameToPacket(afpt->mFrame, afpt->mPacket, afpt->mFrameOffsetInPacket);

            break;

        }

        case kAudioFilePropertyPacketToByte : 

        {

            FailWithAction(*ioDataSize != sizeof(AudioBytePacketTranslation), 

                err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            AudioBytePacketTranslation* abpt = (AudioBytePacketTranslation*)ioPropertyData;

            err = PacketToByte(abpt);

            break;

        }   

        case kAudioFilePropertyByteToPacket :

        {

            FailWithAction(*ioDataSize != sizeof(AudioBytePacketTranslation), 

                err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            AudioBytePacketTranslation* abpt = (AudioBytePacketTranslation*)ioPropertyData;

            err = ByteToPacket(abpt);

            break;

        }

        case kAudioFilePropertyInfoDictionary :

        {

            FailWithAction(*ioDataSize != sizeof(CFDictionaryRef), 

                err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            CACFDictionary      afInfoDictionary(true);

            err = GetInfoDictionary(&afInfoDictionary);         

            if (!err)

            {

                *(CFMutableDictionaryRef *)ioPropertyData = afInfoDictionary.CopyCFMutableDictionary();

            }

            break;

        }

        case kTEMPAudioFilePropertySoundCheckDictionary :

        {

            FailWithAction(*ioDataSize != sizeof(CFDictionaryRef), 

                err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            CACFDictionary      afInfoDictionary(true);

            err = GetSoundCheckDictionary(&afInfoDictionary);

            if (err) {

                OSStatus err2 = GetSoundCheckDictionaryFromLoudnessInfo(&afInfoDictionary);

                if (err2 == noErr) err = noErr; // else report original error from GetSoundCheckDictionary.

            }

            if (!err)

            {

                *(CFMutableDictionaryRef *)ioPropertyData = afInfoDictionary.CopyCFMutableDictionary();

            }

            break;

        }

        case kTEMPAudioFilePropertyLoudnessInfo :

        {

            FailWithAction(*ioDataSize != sizeof(CFDictionaryRef), 

                err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            CACFDictionary      afInfoDictionary(true);

            err = GetLoudnessInfo(&afInfoDictionary);

            if (err) {

                OSStatus err2 = GetLoudnessInfoFromSoundCheckDictionary(&afInfoDictionary);

                if (err2 == noErr) err = noErr; // else report original error from GetLoudnessInfo.

            }

            if (!err) 

            {

                *(CFMutableDictionaryRef *)ioPropertyData = afInfoDictionary.CopyCFMutableDictionary();

            }

            break;

        }

        case kTEMPAudioFilePropertyGenerateLoudnessInfo :

        {

            FailWithAction(*ioDataSize != sizeof(CFDictionaryRef),

                err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            CACFDictionary      afInfoDictionary(true);

            err = GenerateLoudnessInfo(&afInfoDictionary);          

            if (!err)

            {

                *(CFMutableDictionaryRef *)ioPropertyData = afInfoDictionary.CopyCFMutableDictionary();

            }

            break;

        }

        case kAudioFilePropertyEstimatedDuration :

        {

            FailWithAction(*ioDataSize != sizeof(Float64), 

                err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            err = GetEstimatedDuration((Float64*)ioPropertyData); 

            break;

        }

        case 'LYRC' :

            if (*ioDataSize < sizeof(CFStringRef))

                return kAudioFileBadPropertySizeError;

            *ioDataSize = sizeof(CFStringRef);

            err = GetLyrics((CFStringRef*) ioPropertyData);

            break;

        case 'eof?' : 

        {

            if (*ioDataSize != sizeof(UInt32))

                return kAudioFileBadPropertySizeError;

            SInt64 pos;

            err = GetDataSource()->GetPos(pos);

            if (err) break;

            SInt64 endOfData = GetDataOffset() + GetNumBytes();

            *(UInt32*)ioPropertyData = pos >= endOfData;

            break;

        }   

        case 'sbtd' /*kAudioFilePropertySourceBitDepth*/ :

        {

            if (*ioDataSize != sizeof(SInt32))

                return kAudioFileBadPropertySizeError;

            SInt32 outValue = 0;

            err = GetSourceBitDepth(outValue);

            if ((err || outValue == 0) && GetDataFormat().mFormatID == kAudioFormatLinearPCM) {

                // if there was no stored source bit depth, and this file is LPCM, then report this file's bit depth.

                err = noErr;

                outValue = GetDataFormat().mBitsPerChannel;

                if (GetDataFormat().mFormatFlags & kAudioFormatFlagIsFloat) 

                    outValue = -outValue;

            } else if (err) 

                break;

            *(SInt32 *) ioPropertyData = outValue;

            break;

        }   

        default:

            err = kAudioFileUnsupportedPropertyError;           

            break;

    }

Bail:

    return err;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus    AudioFileObject::SetProperty(

                                    AudioFilePropertyID     inPropertyID,

                                    UInt32                  inDataSize,

                                    const void              *inPropertyData)

{

    OSStatus        err = noErr;

    switch (inPropertyID)

    {

        case kAudioFilePropertyDataFormat:

            FailWithAction(inDataSize != sizeof(AudioStreamBasicDescription), 

                err = kAudioFileBadPropertySizeError, Bail, "Incorrect data size");

            err = UpdateDataFormat((AudioStreamBasicDescription *) inPropertyData);

            break;

        case kAudioFilePropertyFormatList:

            err = SetFormatList(inDataSize, (AudioFormatListItem*)inPropertyData);

            break;

        case kAudioFilePropertyAudioDataByteCount: {

            FailWithAction(inDataSize != sizeof(SInt64), err = kAudioFileBadPropertySizeError, Bail, "Incorrect data size");

            SInt64 numBytes = *(SInt64 *) inPropertyData;

            if (numBytes > GetNumBytes()) {

                // can't use this to increase data size.

                return kAudioFileOperationNotSupportedError;

            }

            UInt32 saveDefer = DeferSizeUpdates();

            SetDeferSizeUpdates(0); // force an update.

            err = UpdateNumBytes(numBytes);

            SetDeferSizeUpdates(saveDefer);

        } break;

        case kAudioFilePropertyAudioDataPacketCount: {

            SInt64 numPackets = *(SInt64 *) inPropertyData;

            if (numPackets > GetNumPackets()) {

                // can't use this to increase data size.

                return kAudioFileOperationNotSupportedError;

            }

            err = UpdateNumPackets(numPackets);

        } break;

        case kAudioFilePropertyMagicCookieData:            

            err = SetMagicCookieData(inDataSize, inPropertyData);

            break;

        case kAudioFilePropertyMarkerList :

            err = SetMarkerList(inDataSize, static_cast<const AudioFileMarkerList*>(inPropertyData));           

            break;

        case kAudioFilePropertyRegionList :

            err = SetRegionList(inDataSize, static_cast<const AudioFileRegionList*>(inPropertyData));           

            break;

        case kAudioFilePropertyChannelLayout :

            err = SetChannelLayout(inDataSize, static_cast<const AudioChannelLayout*>(inPropertyData));         

            break;

        case kAudioFilePropertyDeferSizeUpdates :

            FailWithAction(inDataSize != sizeof(UInt32), 

                err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            SetDeferSizeUpdates(*(UInt32 *) inPropertyData);

            break;

        case kAudioFilePropertyInfoDictionary :

        {

            FailWithAction(inDataSize != sizeof(CFDictionaryRef), 

                err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            // pass the SetInfoDictionary a CACFDictionary object made with the provided CFDictionaryRef

            // Let the caller release their own CFObject so pass false for th erelease parameter

            CACFDictionary      afInfoDictionary(*(CFDictionaryRef *)inPropertyData, false);

            err = SetInfoDictionary(&afInfoDictionary);         

            break;

        }

        case kTEMPAudioFilePropertySoundCheckDictionary :

        {

            FailWithAction(inDataSize != sizeof(CFDictionaryRef), 

                err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            // pass the SetInfoDictionary a CACFDictionary object made with the provided CFDictionaryRef

            // Let the caller release their own CFObject so pass false for the release parameter

            CACFDictionary      afInfoDictionary(*(CFDictionaryRef *)inPropertyData, false);

            err = SetSoundCheckDictionary(&afInfoDictionary);           

            break;

        }

        case kTEMPAudioFilePropertyLoudnessInfo :

        {

            FailWithAction(inDataSize != sizeof(CFDictionaryRef), 

                err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            // pass the SetInfoDictionary a CACFDictionary object made with the provided CFDictionaryRef

            // Let the caller release their own CFObject so pass false for the release parameter

            CACFDictionary      afInfoDictionary(*(CFDictionaryRef *)inPropertyData, false);

            err = SetLoudnessInfo(&afInfoDictionary);           

            break;

        }

        case 'sbtd' /*kAudioFilePropertySourceBitDepth*/ :

        {

            FailWithAction(inDataSize != sizeof(SInt32), 

                err = kAudioFileBadPropertySizeError, Bail, "inDataSize is wrong");

            SInt32 inValue = *(SInt32 *)inPropertyData;

            err = SetSourceBitDepth(inValue);

            break;

        }   

      default:

            err = kAudioFileUnsupportedPropertyError;           

        break;

    }

Bail:

    return err;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::SetDataFormat(const AudioStreamBasicDescription* inStreamFormat)

{

    OSStatus err = noErr;

    if (!IsDataFormatValid(inStreamFormat))

        return kAudioFileUnsupportedDataFormatError;

    if (!IsDataFormatSupported(inStreamFormat)) 

        return kAudioFileUnsupportedDataFormatError;

    UInt32 prevBytesPerPacket = mDataFormat.mBytesPerPacket;

    mDataFormat = *inStreamFormat;

    // if CBR and bytes per packet changes, we need to change the number of packets we think we have.

    if (mDataFormat.mBytesPerPacket && mDataFormat.mBytesPerPacket != prevBytesPerPacket)

    {

        SInt64 numPackets = GetNumBytes() / mDataFormat.mBytesPerPacket;

        SetNumPackets(numPackets);

        SetMaximumPacketSize(mDataFormat.mBytesPerPacket);

        if (!mFirstSetFormat)

            SizeChanged();

    }

    mFirstSetFormat = false;

    return err;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::GetFormatListInfo(    UInt32              &outDataSize,

                                                    UInt32              &outWritable)

{

    // default implementation is to just return the data format

    outDataSize = sizeof(AudioFormatListItem);

    outWritable = false;

    return noErr;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::GetFormatList(    UInt32                                  &ioDataSize,

                                                AudioFormatListItem                     *ioPropertyData)

{

    // default implementation is to just return the data format

    if (ioDataSize < sizeof(AudioFormatListItem))

        return kAudioFileBadPropertySizeError;

    AudioFormatListItem afli;

    afli.mASBD = mDataFormat;

    AudioChannelLayoutTag layoutTag = /*kAudioChannelLayoutTag_Unknown*/ 0xFFFF0000 | mDataFormat.mChannelsPerFrame;

    UInt32 layoutSize, isWritable;

    OSStatus err = GetChannelLayoutSize(&layoutSize, &isWritable);

    if (err == noErr)

    {

        CAAutoFree<AudioChannelLayout> layout;

        layout.allocBytes(layoutSize);

        err = GetChannelLayout(&layoutSize, layout());

        if (err == noErr) {

            layoutTag = layout->mChannelLayoutTag;

        }

    }

    afli.mChannelLayoutTag = layoutTag; 

    memcpy(ioPropertyData, &afli, sizeof(AudioFormatListItem));

    ioDataSize = sizeof(AudioFormatListItem);

    return noErr;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::SetFormatList(    UInt32                                  inDataSize,

                                            const AudioFormatListItem               *inPropertyData)

{

    return kAudioFileOperationNotSupportedError;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

OSStatus AudioFileObject::UpdateDataFormat(const AudioStreamBasicDescription* inStreamFormat)

{

    return SetDataFormat(inStreamFormat);

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Boolean AudioFileObject::IsDataFormatValid(AudioStreamBasicDescription const* inDesc)

{

    if (inDesc->mSampleRate < 0.)

        return false;

    if (inDesc->mSampleRate > 3e6)

        return false;

    if (inDesc->mChannelsPerFrame < 1 || inDesc->mChannelsPerFrame > 0x000FFFFF)

        return false;

    if (inDesc->mFormatID == kAudioFormatLinearPCM)

    {           

        if (inDesc->mBitsPerChannel < 1 || inDesc->mBitsPerChannel > 64)

            return false;

        if (inDesc->mFramesPerPacket != 1)

            return false;

        if (inDesc->mBytesPerPacket == 0) 

            return false;

        if (inDesc->mBytesPerFrame != inDesc->mBytesPerPacket)

            return false;

        // [3605260] we assume here that a packet is an integer number of frames.

        UInt32 minimumBytesPerPacket = (inDesc->mBitsPerChannel * inDesc->mChannelsPerFrame + 7) / 8;

        if (inDesc->mBytesPerPacket < minimumBytesPerPacket) 

            return false;

    }

    return true;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

void AudioFileObject::SetDataSource(DataSource* inDataSource)   

{

    if (mDataSource != inDataSource) {

        delete mDataSource;

        mDataSource = inDataSource;

    }

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

void    AudioFileObject::SetURL (CFURLRef inURL)

{

    if (mFileRef == inURL) return;

    if (inURL) CFRetain (inURL);

    if (mFileRef) CFRelease(mFileRef);

    mFileRef = inURL;

}

OSStatus AudioFileObject::OpenFile(SInt8 inPermissions, int inFD)

{

    OSStatus err = noErr;

    SetDataSource(new Cached_DataSource(new UnixFile_DataSource(inFD, inPermissions, true)));

    mFileD = inFD;

    SetPermissions (inPermissions);

    return err;

}

OSStatus AudioFileObject::CreateDataFile (CFURLRef  inFileRef, int  &outFileD)

{    

    UInt8 fPath[FILENAME_MAX];  

    if (!CFURLGetFileSystemRepresentation (inFileRef, true, fPath, FILENAME_MAX))

        return kAudio_FileNotFoundError;

    struct stat stbuf;

    if (stat ((const char*)fPath, &stbuf) == 0) 

        return kAudioFilePermissionsError;

#if TARGET_OS_WIN32

    int filePerms = S_IREAD | S_IWRITE;

    int flags = O_CREAT | O_EXCL | O_RDWR | O_BINARY;

#else

    mode_t filePerms = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;

    int flags = O_CREAT | O_EXCL | O_RDWR;

#endif

    outFileD = open((const char*)fPath, flags, filePerms);

    if (outFileD < 0)

        return AudioFileTranslateErrno(errno);

    return noErr;

}

OSStatus AudioFileObject::AddDurationToInfoDictionary(CACFDictionary *infoDict, Float64 &inDuration)

{

#if !TARGET_OS_WIN32

    CFLocaleRef currentLocale = CFLocaleGetSystem();

    CFNumberFormatterRef numberFormatter = NULL;

    numberFormatter = CFNumberFormatterCreate(kCFAllocatorDefault, currentLocale, kCFNumberFormatterDecimalStyle);

    CFStringRef cfStr = CFNumberFormatterCreateStringWithValue( kCFAllocatorDefault, numberFormatter, kCFNumberFloat64Type, &inDuration);

    if (cfStr)

    {

        if (CFStringGetLength(cfStr) != 0)

            infoDict->AddString(CFSTR(kAFInfoDictionary_ApproximateDurationInSeconds), cfStr);

        CFRelease(cfStr);

    }

    CFRelease(numberFormatter);

#endif

    return noErr;

}

OSStatus AudioFileObject::SizeChanged()

{

    OSStatus err = noErr;

    if (mPermissions & kAudioFileWritePermission) 

    {

        if (DeferSizeUpdates())

            SetNeedsSizeUpdate(true);

        else

            err = UpdateSize();

    }

    return err;

}

OSStatus AudioFileObject::UpdateSizeIfNeeded()

{       

    if (GetNeedsSizeUpdate()) 

    {

        OSStatus err = UpdateSize();

        if (err) return err;

        SetNeedsSizeUpdate(false);

    }

    return noErr;

}

OSStatus AudioFileObject::CountUserData(    UInt32                  /*inUserDataID*/,

                                            UInt32*                 /*outNumberItems*/)

{

    return kAudioFileOperationNotSupportedError;

}

OSStatus AudioFileObject::GetUserDataSize(  UInt32                  /*inUserDataID*/,

                                            UInt32                  /*inIndex*/,

                                            UInt32*                 /*outDataSize*/)

{

    return kAudioFileOperationNotSupportedError;

}

OSStatus AudioFileObject::GetUserData(      UInt32                  /*inUserDataID*/,

                                            UInt32                  /*inIndex*/,

                                            UInt32*                 /*ioDataSize*/,

                                            void*                   /*ioUserData*/)

{

    return kAudioFileOperationNotSupportedError;

}

OSStatus AudioFileObject::SetUserData(      UInt32                  /*inUserDataID*/,

                                            UInt32                  /*inIndex*/,

                                            UInt32                  /*inDataSize*/,

                                            const void*             /*inUserData*/)

{

    return kAudioFileOperationNotSupportedError;

}

OSStatus AudioFileObject::RemoveUserData(   UInt32                  /*inUserDataID*/,

                                            UInt32                  /*inIndex*/)

{

    return kAudioFileOperationNotSupportedError;

}

OSStatus AudioFileObject::MoveData(SInt64 fromPos, SInt64 toPos, SInt64 size)

{

    if (fromPos == toPos) 

        return noErr;

    OSStatus err = noErr;

    CAAutoFree<char> audioData(kCopySoundDataBufferSize, true);

    SInt64 bytesRemaining = size;

    if (fromPos < toPos) {

        while (bytesRemaining > 0)

        {

            // read from old file

            UInt32 byteCount;

            SInt64 count = (bytesRemaining < kCopySoundDataBufferSize) ? bytesRemaining : kCopySoundDataBufferSize; 

            err = GetDataSource()->ReadBytes(SEEK_SET, fromPos+(bytesRemaining-count), (UInt32)count, audioData(), &byteCount);

            FailIf (err != noErr, Bail, "MoveData ReadBytes failed");

            err = GetDataSource()->WriteBytes(SEEK_SET, toPos+(bytesRemaining-count), (UInt32)count, audioData(), &byteCount);

            FailIf (err != noErr, Bail, "WriteBytes failed");

            bytesRemaining -= count;

        }

    } else {

        while (bytesRemaining > 0)

        {

            // read from old file

            UInt32 byteCount;

            SInt64 count = (bytesRemaining < kCopySoundDataBufferSize) ? bytesRemaining : kCopySoundDataBufferSize; 

            err = GetDataSource()->ReadBytes(SEEK_SET, fromPos+(size - bytesRemaining), (UInt32)count, audioData(), &byteCount);

            FailIf (err != noErr, Bail, "MoveData ReadBytes failed");

            err = GetDataSource()->WriteBytes(SEEK_SET, toPos+(size - bytesRemaining), (UInt32)count, audioData(), &byteCount);

            FailIf (err != noErr, Bail, "WriteBytes failed");

            bytesRemaining -= count;

        }

    }

Bail:

    return err;

}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~