CAFFileALAC.cpp

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*/

//
// CAFFileALAC.cpp
//
// Copyright 2011 Apple Inc. All rights reserved.
//

#include<stdio.h>
#include"CAFFileALAC.h"
#include"EndianPortable.h"

#definekSizeOfChanAtomPlusChannelLayout24

int32_tFindCAFFPacketTableStart(FILE * inputFile, int32_t * paktPos, int32_t * paktSize)
{
// returns the absolute position within the file
int32_t currentPosition = ftell(inputFile); // record the current position
uint8_t theReadBuffer[12];
uint32_t chunkType = 0, chunkSize = 0;
bool done = false;
int32_t bytesRead = 8;

fseek(inputFile, bytesRead, SEEK_SET); // start at 8!
while (!done && bytesRead > 0) // no file size here
 {
 bytesRead = fread(theReadBuffer, 1, 12, inputFile);
 chunkType = ((int32_t)(theReadBuffer[0]) << 24) + ((int32_t)(theReadBuffer[1]) << 16) + ((int32_t)(theReadBuffer[2]) << 8) + theReadBuffer[3];
switch(chunkType)
 {
case'pakt':
 *paktPos = ftell(inputFile) + kMinCAFFPacketTableHeaderSize;
// big endian size
 *paktSize = ((int32_t)(theReadBuffer[8]) << 24) + ((int32_t)(theReadBuffer[9]) << 16) + ((int32_t)(theReadBuffer[10]) << 8) + theReadBuffer[11];
 done = true;
break;
default:
 chunkSize = ((int32_t)(theReadBuffer[8]) << 24) + ((int32_t)(theReadBuffer[9]) << 16) + ((int32_t)(theReadBuffer[10]) << 8) + theReadBuffer[11];
fseek(inputFile, chunkSize, SEEK_CUR);
break;
 }
 }

fseek(inputFile, currentPosition, SEEK_SET); // start at 0

return0;

}

voidWriteCAFFcaffChunk(FILE * outputFile)
{
uint8_t theReadBuffer[8] = {'c', 'a', 'f', 'f', 0, 1, 0, 0};

fwrite(theReadBuffer, 1, 8, outputFile);
}

voidWriteCAFFdescChunk(FILE * outputFile, AudioFormatDescription theOutputFormat)
{
 port_CAFAudioDescription theDescription;
uint32_t tempFormatFlags = theOutputFormat.mFormatFlags;
uint8_t theReadBuffer[12] = {'d', 'e', 's', 'c', 0, 0, 0, 0, 0, 0, 0, 0}; 

if (theOutputFormat.mFormatID == kALACFormatLinearPCM)
 {
if (kALACFormatFlagsNativeEndian > 0) // kALACFormatFlagsNativeEndian is 2 on a big endian machine, 0 on little
 {
 tempFormatFlags = 0;
 }
else
 {
 tempFormatFlags = k_port_CAFLinearPCMFormatFlagIsLittleEndian;
 }
 }

 theDescription.mSampleRate = SwapFloat64NtoB(theOutputFormat.mSampleRate);
 theDescription.mFormatID = Swap32NtoB(theOutputFormat.mFormatID);
 theDescription.mFormatFlags = Swap32NtoB(tempFormatFlags);
 theDescription.mBytesPerPacket = Swap32NtoB(theOutputFormat.mBytesPerPacket);
 theDescription.mFramesPerPacket = Swap32NtoB(theOutputFormat.mFramesPerPacket);
 theDescription.mChannelsPerFrame = Swap32NtoB(theOutputFormat.mChannelsPerFrame);
 theDescription.mBitsPerChannel = Swap32NtoB(theOutputFormat.mBitsPerChannel);

 theReadBuffer[11] = sizeof(port_CAFAudioDescription);
fwrite(theReadBuffer, 1, 12, outputFile);
fwrite(&theDescription, 1, sizeof(port_CAFAudioDescription), outputFile);
}

voidWriteCAFFdataChunk(FILE * outputFile)
{
uint8_t theReadBuffer[16] = {'d', 'a', 't', 'a', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};

fwrite(theReadBuffer, 1, 16, outputFile);
}

voidWriteCAFFkukiChunk(FILE * outputFile, void * inCookie, uint32_t inCookieSize)
{
uint8_t thekukiHeaderBuffer[12] = {'k', 'u', 'k', 'i', 0, 0, 0, 0, 0, 0, 0, 0}; 

 thekukiHeaderBuffer[11] = inCookieSize;
fwrite(thekukiHeaderBuffer, 1, 12, outputFile);
fwrite(inCookie, 1, inCookieSize, outputFile);
}

voidWriteCAFFChunkSize(FILE * outputFile, int64_t numDataBytes)
{
uint8_t theBuffer[8];

 theBuffer[0] = (numDataBytes >> 56) & 0xff;
 theBuffer[1] = (numDataBytes >> 48) & 0xff;
 theBuffer[2] = (numDataBytes >> 40) & 0xff;
 theBuffer[3] = (numDataBytes >> 32) & 0xff;
 theBuffer[4] = (numDataBytes >> 24) & 0xff;
 theBuffer[5] = (numDataBytes >> 16) & 0xff;
 theBuffer[6] = (numDataBytes >> 8) & 0xff;
 theBuffer[7] = numDataBytes & 0xff;
fwrite(theBuffer, 1, 8, outputFile);
}

voidWriteCAFFchanChunk(FILE * outputFile, uint32_t inChannelTag)
{
uint8_t theBuffer[24] = {'c', 'h', 'a', 'n', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; 

 theBuffer[11] = sizeof(ALACAudioChannelLayout);
 theBuffer[12] = inChannelTag >> 24;
 theBuffer[13] = (inChannelTag >> 16) & 0xff;
 theBuffer[14] = (inChannelTag >> 8) & 0xff;
 theBuffer[15] = inChannelTag & 0xff;

fwrite(theBuffer, 1, 24, outputFile);
}

voidWriteCAFFfreeChunk(FILE * outputFile, uint32_t theSize)
{
uint8_t theBuffer[12] = {'f', 'r', 'e', 'e', 0, 0, 0, 0, 0, 0, 0, 0};
uint32_t i = 0;
uint32_t theAdjustedSize = theSize - sizeof(port_CAFChunkHeader);

if (theSize > theAdjustedSize) // cause we might have wrapped theAdjustedSize
 {
 theBuffer[8] = theAdjustedSize >> 24;
 theBuffer[9] = (theAdjustedSize >> 16) & 0xff;
 theBuffer[10] = (theAdjustedSize >> 8) & 0xff;
 theBuffer[11] = theAdjustedSize & 0xff;
fwrite(theBuffer, 1, 12, outputFile);

for (i = 0; i < theAdjustedSize; ++i)
 {
fwrite(&(theBuffer[4]), 1, 1, outputFile);
 }
 }
}

voidWriteCAFFpaktChunkHeader(FILE * outputFile, port_CAFPacketTableHeader * thePacketTableHeader, uint32_t thePacketTableSize)
{
uint8_t theBuffer[12];
// Endian swap!
 thePacketTableHeader->mNumberPackets = Swap64NtoB(thePacketTableHeader->mNumberPackets);
 thePacketTableHeader->mNumberValidFrames = Swap64NtoB(thePacketTableHeader->mNumberValidFrames);
 thePacketTableHeader->mPrimingFrames = Swap32NtoB(thePacketTableHeader->mPrimingFrames);
 thePacketTableHeader->mRemainderFrames = Swap32NtoB(thePacketTableHeader->mRemainderFrames);
// write out the pakt chunk -- big endian!
 theBuffer[0] = 'p';
 theBuffer[1] = 'a';
 theBuffer[2] = 'k';
 theBuffer[3] = 't';
 theBuffer[4] = 0;
 theBuffer[5] = 0;
 theBuffer[6] = 0;
 theBuffer[7] = 0;
 theBuffer[8] = thePacketTableSize >> 24;
 theBuffer[9] = (thePacketTableSize >> 16) & 0xff;
 theBuffer[10] = (thePacketTableSize >> 8) & 0xff;
 theBuffer[11] = thePacketTableSize & 0xff;
fwrite(theBuffer, 1, 12, outputFile);

fwrite(thePacketTableHeader, 1, kMinCAFFPacketTableHeaderSize, outputFile);
}

voidGetBERInteger(int32_t theOriginalValue, uint8_t * theBuffer, int32_t * theBERSize)
{
if ((theOriginalValue & 0x7f) == theOriginalValue)
 {
 *theBERSize = 1;
 theBuffer[0] = theOriginalValue;
 }
elseif ((theOriginalValue & 0x3fff) == theOriginalValue)
 {
 *theBERSize = 2;
 theBuffer[0] = theOriginalValue >> 7;
 theBuffer[0] |= 0x80;
 theBuffer[1] = theOriginalValue & 0x7f;
 }
elseif ((theOriginalValue & 0x1fffff) == theOriginalValue)
 {
 *theBERSize = 3;
 theBuffer[0] = theOriginalValue >> 14;
 theBuffer[0] |= 0x80;
 theBuffer[1] = (theOriginalValue >> 7) & 0x7f;
 theBuffer[1] |= 0x80;
 theBuffer[2] = theOriginalValue & 0x7f;
 }
elseif ((theOriginalValue & 0x0fffffff) == theOriginalValue)
 {
 *theBERSize = 4;
 theBuffer[0] = theOriginalValue >> 21;
 theBuffer[0] |= 0x80;
 theBuffer[1] = (theOriginalValue >> 14) & 0x7f;
 theBuffer[1] |= 0x80;
 theBuffer[2] = (theOriginalValue >> 7) & 0x7f;
 theBuffer[2] |= 0x80;
 theBuffer[3] = theOriginalValue & 0x7f;
 }
else
 {
 *theBERSize = 5;
 theBuffer[0] = theOriginalValue >> 28;
 theBuffer[0] |= 0x80;
 theBuffer[1] = (theOriginalValue >> 21) & 0x7f;
 theBuffer[1] |= 0x80;
 theBuffer[2] = (theOriginalValue >> 14) & 0x7f;
 theBuffer[2] |= 0x80;
 theBuffer[3] = (theOriginalValue >> 7) & 0x7f;
 theBuffer[3] |= 0x80;
 theBuffer[4] = theOriginalValue & 0x7f;
 }
}

uint32_tReadBERInteger(uint8_t * theInputBuffer, int32_t * ioNumBytes)
{
uint32_t theAnswer = 0;
uint8_t theData;
int32_t size = 0;
do
 {
 theData = theInputBuffer[size];
 theAnswer = (theAnswer << 7) | (theData & 0x7F);
if (++size > 5)
 {
 size = 0xFFFFFFFF;
return0;
 }
 }
while(((theData & 0x80) != 0) && (size <= *ioNumBytes));

 *ioNumBytes = size;

return theAnswer;
}

int32_tBuildBasePacketTable(AudioFormatDescription theInputFormat, int32_t inputDataSize, int32_t * theMaxPacketTableSize, port_CAFPacketTableHeader * thePacketTableHeader)
{
int32_t theMaxPacketSize = 0, theByteSizeTableEntry = 0;

// fill out the header
 thePacketTableHeader->mNumberValidFrames = inputDataSize/((theInputFormat.mBitsPerChannel >> 3) * theInputFormat.mChannelsPerFrame);
 thePacketTableHeader->mNumberPackets = thePacketTableHeader->mNumberValidFrames/kALACDefaultFramesPerPacket;
 thePacketTableHeader->mPrimingFrames = 0;
 thePacketTableHeader->mRemainderFrames = thePacketTableHeader->mNumberValidFrames - thePacketTableHeader->mNumberPackets * kALACDefaultFramesPerPacket;
 thePacketTableHeader->mRemainderFrames = kALACDefaultFramesPerPacket - thePacketTableHeader->mRemainderFrames;
if (thePacketTableHeader->mRemainderFrames) thePacketTableHeader->mNumberPackets += 1;

// Ok, we have to assume the worst case scenario for packet sizes
 theMaxPacketSize = (theInputFormat.mBitsPerChannel >> 3) * theInputFormat.mChannelsPerFrame * kALACDefaultFramesPerPacket + kALACMaxEscapeHeaderBytes;

if (theMaxPacketSize < 16384)
 {
 theByteSizeTableEntry = 2;
 }
else
 {
 theByteSizeTableEntry = 3;
 }
 *theMaxPacketTableSize = theByteSizeTableEntry * thePacketTableHeader->mNumberPackets;

return0;
}

uint32_tGetMagicCookieSizeFromCAFFkuki(FILE * inputFile)
{
// returns to the current absolute position within the file
int32_t currentPosition = ftell(inputFile); // record the current position
uint8_t theReadBuffer[sizeof(ALACSpecificConfig)];
uint32_t chunkType = 0, chunkSize = 0;
bool done = false;
int32_t bytesRead = sizeof(port_CAFFileHeader);
uint32_t theCookieSize = 0;

fseek(inputFile, bytesRead, SEEK_SET); // start at 8!
while (!done && bytesRead > 0) // no file size here
 {
 bytesRead = fread(theReadBuffer, 1, 12, inputFile);
 chunkType = ((int32_t)(theReadBuffer[0]) << 24) + ((int32_t)(theReadBuffer[1]) << 16) + ((int32_t)(theReadBuffer[2]) << 8) + theReadBuffer[3];
switch(chunkType)
 { 
case'kuki':
 {
 theCookieSize = theReadBuffer[11];
 done = true;
break;
 }
default:
 chunkSize = ((int32_t)(theReadBuffer[8]) << 24) + ((int32_t)(theReadBuffer[9]) << 16) + ((int32_t)(theReadBuffer[10]) << 8) + theReadBuffer[11];
fseek(inputFile, chunkSize, SEEK_CUR);
break;
 }
 }

fseek(inputFile, currentPosition, SEEK_SET); // start at 0

if (!done) return -1;

return theCookieSize;

}
// gets the kuki chunk from a caff file
int32_tGetMagicCookieFromCAFFkuki(FILE * inputFile, uint8_t * outMagicCookie, uint32_t * ioMagicCookieSize)
{
// returns to the current absolute position within the file
int32_t currentPosition = ftell(inputFile); // record the current position
uint8_t theReadBuffer[12];
uint32_t chunkType = 0, chunkSize = 0;
bool done = false, cookieFound = false;
int32_t bytesRead = sizeof(port_CAFFileHeader);
uint32_t theStoredCookieSize = 0;

fseek(inputFile, bytesRead, SEEK_SET); // start at 8!
while (!done && bytesRead > 0) // no file size here
 {
 bytesRead = fread(theReadBuffer, 1, 12, inputFile);
 chunkType = ((int32_t)(theReadBuffer[0]) << 24) + ((int32_t)(theReadBuffer[1]) << 16) + ((int32_t)(theReadBuffer[2]) << 8) + theReadBuffer[3];
switch(chunkType)
 { 
case'kuki':
 {
 theStoredCookieSize = theReadBuffer[11];
if (*ioMagicCookieSize >= theStoredCookieSize)
 {
fread(outMagicCookie, 1, theStoredCookieSize, inputFile);
 *ioMagicCookieSize = theStoredCookieSize;
 cookieFound = true;
 }
else
 {
 *ioMagicCookieSize = 0;
 }
 done = true;
break;
 }
default:
 chunkSize = ((int32_t)(theReadBuffer[8]) << 24) + ((int32_t)(theReadBuffer[9]) << 16) + ((int32_t)(theReadBuffer[10]) << 8) + theReadBuffer[11];
fseek(inputFile, chunkSize, SEEK_CUR);
break;
 }
 }

fseek(inputFile, currentPosition, SEEK_SET); // start at 0

if (!done || !cookieFound) return -1;

return0;
}

boolFindCAFFDataStart(FILE * inputFile, int32_t * dataPos, int32_t * dataSize)
{
bool done = false;
int32_t bytesRead = 8;
uint32_t chunkType = 0, chunkSize = 0;
uint8_t theBuffer[12];

fseek(inputFile, bytesRead, SEEK_SET); // start at 8!
while (!done && bytesRead > 0) // no file size here
 {
 bytesRead = fread(theBuffer, 1, 12, inputFile);
 chunkType = ((int32_t)(theBuffer[0]) << 24) + ((int32_t)(theBuffer[1]) << 16) + ((int32_t)(theBuffer[2]) << 8) + theBuffer[3];
switch(chunkType)
 {
case'data':
 *dataPos = ftell(inputFile) + sizeof(uint32_t); // skip the edits
// big endian size
 *dataSize = ((int32_t)(theBuffer[8]) << 24) + ((int32_t)(theBuffer[9]) << 16) + ((int32_t)(theBuffer[10]) << 8) + theBuffer[11];
 *dataSize -= 4; // the edits are included in the size
 done = true;
break;
default:
 chunkSize = ((int32_t)(theBuffer[8]) << 24) + ((int32_t)(theBuffer[9]) << 16) + ((int32_t)(theBuffer[10]) << 8) + theBuffer[11];
fseek(inputFile, chunkSize, SEEK_CUR);
break;
 }
 }
return done;
}

boolGetCAFFdescFormat(FILE * inputFile, AudioFormatDescription * theInputFormat)
{
bool done = false;
uint32_t theChunkSize = 0, theChunkType = 0;
uint8_t theReadBuffer[32];

fseek(inputFile, 4, SEEK_CUR); // skip 4 bytes

while (!done)
 {
fread(theReadBuffer, 1, 4, inputFile);
 theChunkType = ((int32_t)(theReadBuffer[0]) << 24) + ((int32_t)(theReadBuffer[1]) << 16) + ((int32_t)(theReadBuffer[2]) << 8) + theReadBuffer[3];
switch (theChunkType)
 {
case'desc':
fseek(inputFile, 8, SEEK_CUR); // skip 8 bytes
fread(theReadBuffer, 1, sizeof(port_CAFAudioDescription), inputFile);
 theInputFormat->mFormatID = Swap32BtoN(((port_CAFAudioDescription *)(theReadBuffer))->mFormatID);
 theInputFormat->mChannelsPerFrame = Swap32BtoN(((port_CAFAudioDescription *)(theReadBuffer))->mChannelsPerFrame);
 theInputFormat->mSampleRate = SwapFloat64BtoN(((port_CAFAudioDescription *)(theReadBuffer))->mSampleRate);
 theInputFormat->mBitsPerChannel = Swap32BtoN(((port_CAFAudioDescription *)(theReadBuffer))->mBitsPerChannel);
 theInputFormat->mFormatFlags = Swap32BtoN(((port_CAFAudioDescription *)(theReadBuffer))->mFormatFlags);
 theInputFormat->mBytesPerPacket = Swap32BtoN(((port_CAFAudioDescription *)(theReadBuffer))->mBytesPerPacket);
if (theInputFormat->mFormatID == kALACFormatAppleLossless)
 {
 theInputFormat->mBytesPerFrame = 0;
 }
else
 {
 theInputFormat->mBytesPerFrame = theInputFormat->mBytesPerPacket;
if ((theInputFormat->mFormatFlags & 0x02) == 0x02)
 {
 theInputFormat->mFormatFlags &= 0xfffffffc;
 }
else
 {
 theInputFormat->mFormatFlags |= 0x02;
 }

 }
 theInputFormat->mFramesPerPacket = Swap32BtoN(((port_CAFAudioDescription *)(theReadBuffer))->mFramesPerPacket);
 theInputFormat->mReserved = 0;
 done = true;
break;
default:
// read the size and skip
fread(theReadBuffer, 1, 8, inputFile);
 theChunkSize = ((int32_t)(theReadBuffer[4]) << 24) + ((int32_t)(theReadBuffer[5]) << 16) + ((int32_t)(theReadBuffer[6]) << 8) + theReadBuffer[7];
fseek(inputFile, theChunkSize, SEEK_CUR);
break;
 }
 }
return done;
}