private static void FixHeaderAndCloseWriter(FileStream pFs, ExtractXaStruct pExtractXaStruct,
bool nonSilentBlockFound)
{
string filename = pFs.Name;
if (pExtractXaStruct.AddRiffHeader)
{
UInt32 xaFileSize = (UInt32)pFs.Length;
// add file size
pFs.Position = Cdxa.FILESIZE_OFFSET;
pFs.Write(BitConverter.GetBytes(xaFileSize - 8), 0, 4);
// add data size
pFs.Position = Cdxa.DATA_LENGTH_OFFSET;
pFs.Write(BitConverter.GetBytes((uint)(xaFileSize - Cdxa.XA_RIFF_HEADER.Length)), 0, 4);
}
pFs.Close();
pFs.Dispose();
if (!nonSilentBlockFound)
{
File.Delete(filename);
}
}
private static string GetOutputFileName(ExtractXaStruct pExtractXaStruct, byte[] pTrackId)
{
string outputDirectory = Path.Combine(Path.GetDirectoryName(pExtractXaStruct.Path),
Path.GetFileNameWithoutExtension(pExtractXaStruct.Path));
string outputFileName = Path.GetFileNameWithoutExtension(pExtractXaStruct.Path) + "_" + ParseFile.ByteArrayToString(pTrackId) + Cdxa.XA_FILE_EXTENSION;
int fileCount = Directory.GetFiles(outputDirectory, String.Format("{0}*", Path.GetFileNameWithoutExtension(outputFileName)), SearchOption.TopDirectoryOnly).Length;
outputFileName = String.Format("{0}_{1}{2}", Path.GetFileNameWithoutExtension(outputFileName), fileCount.ToString("X4"), Cdxa.XA_FILE_EXTENSION);
//if (outputFileName.Equals("BGM2_01016401_0005.xa"))
//{
// int x = 1;
//}
string ret = Path.Combine(outputDirectory, outputFileName);
return(ret);
}
private static bool IsSilentBlock(byte[] pCdxaBlock, ExtractXaStruct pExtractXaStruct)
{
bool ret = false;
int silentFrameCount = 0;
long bufferOffset = 0;
while ((bufferOffset = ParseFile.GetNextOffset(pCdxaBlock, bufferOffset, Cdxa.XA_SILENT_FRAME)) > -1)
{
silentFrameCount++;
bufferOffset += 1;
}
// did we find enough silent frames?
if (silentFrameCount >= pExtractXaStruct.SilentFramesCount)
{
ret = true;
}
return(ret);
}
public static void ExtractXaFiles(ExtractXaStruct pExtractXaStruct)
{
Dictionary <UInt32, CdxaWriterStruct> bwDictionary = new Dictionary <UInt32, CdxaWriterStruct>();
List <UInt32> bwKeys;
long offset;
byte[] trackId;
byte[] buffer = new byte[Cdxa.XA_BLOCK_SIZE];
UInt32 trackKey;
byte[] tempTrackId;
UInt32 tempTrackKey;
long previousOffset;
long distanceBetweenBlocks;
long distanceCeiling = EMPTY_BLOCK_OFFSET_FLAG;
Dictionary <long, int> distanceFrequency = new Dictionary <long, int>();
CdxaWriterStruct workingStruct = new CdxaWriterStruct();
string outputFileName;
string outputDirectory = Path.Combine(Path.GetDirectoryName(pExtractXaStruct.Path),
Path.GetFileNameWithoutExtension(pExtractXaStruct.Path));
int totalPasses = 1;
bool doFileWrite = false;
if (pExtractXaStruct.DoTwoPass)
{
totalPasses = 2;
}
using (FileStream fs = File.OpenRead(pExtractXaStruct.Path))
{
for (int currentPass = 1; currentPass <= totalPasses; currentPass++)
{
// turn on write flag
if (currentPass == totalPasses)
{
doFileWrite = true;
}
// get first offset to start the party
offset = ParseFile.GetNextOffset(fs, 0, Cdxa.XA_SIG);
if (offset != -1) // we have found an XA sig
{
if (!Directory.Exists(outputDirectory))
{
Directory.CreateDirectory(outputDirectory);
}
while ((offset != -1) && ((offset + Cdxa.XA_BLOCK_SIZE) <= fs.Length))
{
trackId = ParseFile.ParseSimpleOffset(fs, offset + Cdxa.XA_TRACK_OFFSET, Cdxa.XA_TRACK_SIZE);
trackKey = GetTrackKey(trackId);
//trackKey = ParseFile.ReadUintBE(fs, offset + Cdxa.XA_TRACK_OFFSET) & 0xFFFF0000;
if (pExtractXaStruct.UseEndOfTrackMarkerForEof &&
(
((trackId[2] & Cdxa.XA_END_OF_TRACK_MARKER) == Cdxa.XA_END_OF_TRACK_MARKER) ||
((trackId[2] & Cdxa.XA_END_OF_AUDIO_MARKER) == Cdxa.XA_END_OF_AUDIO_MARKER)
))
{
// close the track
tempTrackId = trackId;
tempTrackId[2] = Cdxa.XA_CHUNK_ID_DIGITS;
tempTrackKey = GetTrackKey(tempTrackId);
if (bwDictionary.ContainsKey(tempTrackKey))
{
// close up this file, we're done.
if (doFileWrite)
{
// write the block
// set offset, doing this way because of boxing issues
workingStruct = bwDictionary[tempTrackKey];
workingStruct.CurrentChunkOffset = offset;
bwDictionary[tempTrackKey] = workingStruct;
// get the next block
buffer = ParseFile.ParseSimpleOffset(fs, offset, Cdxa.XA_BLOCK_SIZE);
// patch if needed
if (pExtractXaStruct.PatchByte0x11)
{
buffer[0x11] = 0x00;
}
// write the block
bwDictionary[tempTrackKey].FileWriter.Write(buffer, 0, buffer.Length);
// set flag that a non-silent block was found
if (!bwDictionary[tempTrackKey].NonSilentBlockDetected)
{
// doing this way because of boxing issues
workingStruct = bwDictionary[tempTrackKey];
workingStruct.NonSilentBlockDetected = true;
bwDictionary[tempTrackKey] = workingStruct;
}
FixHeaderAndCloseWriter(bwDictionary[tempTrackKey].FileWriter, pExtractXaStruct,
bwDictionary[tempTrackKey].NonSilentBlockDetected);
}
bwDictionary.Remove(tempTrackKey);
}
offset += Cdxa.XA_BLOCK_SIZE;
}
else if ((pExtractXaStruct.FilterAgainstBlockId) &&
((trackId[2] & 0x0F) != Cdxa.XA_AUDIO_MASK))
{
offset = ParseFile.GetNextOffset(fs, offset + 1, Cdxa.XA_SIG);
}
else
{
// check distance between blocks for possible split
if ((doFileWrite) &&
(bwDictionary.ContainsKey(trackKey)) &&
(distanceCeiling != EMPTY_BLOCK_OFFSET_FLAG) &&
(bwDictionary[trackKey].CurrentChunkOffset != EMPTY_BLOCK_OFFSET_FLAG))
{
previousOffset = bwDictionary[trackKey].CurrentChunkOffset;
distanceBetweenBlocks = offset - previousOffset;
if (distanceBetweenBlocks > distanceCeiling)
{
// close up this file, we're done.
FixHeaderAndCloseWriter(bwDictionary[trackKey].FileWriter, pExtractXaStruct,
bwDictionary[trackKey].NonSilentBlockDetected);
bwDictionary.Remove(trackKey);
}
}
// First Block only
if (!bwDictionary.ContainsKey(trackKey))
{
outputFileName = GetOutputFileName(pExtractXaStruct, trackId);
workingStruct = new CdxaWriterStruct();
workingStruct.CurrentChunkOffset = EMPTY_BLOCK_OFFSET_FLAG;
workingStruct.NonSilentBlockDetected = false;
if (doFileWrite)
{
workingStruct.FileWriter = File.Open(outputFileName, FileMode.Create, FileAccess.ReadWrite);
}
bwDictionary.Add(trackKey, workingStruct);
if (doFileWrite && pExtractXaStruct.AddRiffHeader)
{
bwDictionary[trackKey].FileWriter.Write(Cdxa.XA_RIFF_HEADER, 0, Cdxa.XA_RIFF_HEADER.Length);
}
}
// calculate distance between blocks for possible split
if ((!doFileWrite) &&
(bwDictionary[trackKey].CurrentChunkOffset != EMPTY_BLOCK_OFFSET_FLAG))
{
previousOffset = bwDictionary[trackKey].CurrentChunkOffset;
distanceBetweenBlocks = offset - previousOffset;
if (!distanceFrequency.ContainsKey(distanceBetweenBlocks))
{
distanceFrequency.Add(distanceBetweenBlocks, 1);
}
else
{
distanceFrequency[distanceBetweenBlocks]++;
}
}
// set offset, doing this way because of boxing issues
workingStruct = bwDictionary[trackKey];
workingStruct.CurrentChunkOffset = offset;
bwDictionary[trackKey] = workingStruct;
// get the next block
buffer = ParseFile.ParseSimpleOffset(fs, offset, Cdxa.XA_BLOCK_SIZE);
// check if this is a "silent" block
if ((pExtractXaStruct.UseSilentBlocksForEof) && IsSilentBlock(buffer, pExtractXaStruct))
{
if (doFileWrite)
{
// close up this file, we're done.
FixHeaderAndCloseWriter(bwDictionary[trackKey].FileWriter, pExtractXaStruct,
bwDictionary[trackKey].NonSilentBlockDetected);
}
bwDictionary.Remove(trackKey);
}
else if (doFileWrite)
{
// patch if needed
if (pExtractXaStruct.PatchByte0x11)
{
buffer[0x11] = 0x00;
}
// write the block
bwDictionary[trackKey].FileWriter.Write(buffer, 0, buffer.Length);
// set flag that a non-silent block was found
if (!bwDictionary[trackKey].NonSilentBlockDetected)
{
// doing this way because of boxing issues
workingStruct = bwDictionary[trackKey];
workingStruct.NonSilentBlockDetected = true;
bwDictionary[trackKey] = workingStruct;
}
}
offset += Cdxa.XA_BLOCK_SIZE;
}
}
// fix header and close writers
bwKeys = new List <UInt32>(bwDictionary.Keys);
foreach (UInt32 keyname in bwKeys)
{
if (doFileWrite)
{
FixHeaderAndCloseWriter(bwDictionary[keyname].FileWriter, pExtractXaStruct,
bwDictionary[keyname].NonSilentBlockDetected);
}
bwDictionary.Remove(keyname);
}
// get statistical mode of distance between blocks
if (!doFileWrite)
{
distanceCeiling = GetDistanceCeiling(distanceFrequency);
}
}
else
{
// no CD-XA found
break;
}
}
}
}
