private static bool Overlaps(WaveFileInfo A, WaveFileInfo B)
{
if (A == null || B == null)
{
return(false);
}
//End of A
var AE = A.FilePosition + A.Header.DataSize + (A.Header.DataOffset - A.FilePosition);
//End of B
var BE = B.FilePosition + B.Header.DataSize + (B.Header.DataOffset - B.FilePosition);
//A is entirely before B or B is entirely before A
if (AE <= B.FilePosition || BE <= A.FilePosition)
{
return(false);
}
//A starts inside B or B starts inside A
if ((A.FilePosition > B.FilePosition && A.FilePosition < BE) || (B.FilePosition > A.FilePosition && B.FilePosition < AE))
{
return(true);
}
//A ends inside B or B ends inside A
if ((AE > B.FilePosition && AE < BE) || (BE > A.FilePosition && BE < AE))
{
return(true);
}
throw new NotImplementedException("");
}
private static void Scanner(object o)
{
var S = (Stream)o;
Cont = true;
Files = new List <WaveFileInfo>();
var buffer = new byte[100 * 1000 * 1000];
var SEQ = Encoding.Default.GetBytes("WAVEfmt ");
#if DEBUG
//For debug only.
//Right now the audio files seem to be towards the end of the file.
//To speed up debugging, we skip the first half of the file.
S.Seek(S.Length / 2, SeekOrigin.Begin);
#endif
while (Cont)
{
if (S.Position > 0)
{
S.Seek(-SEQ.Length, SeekOrigin.Current);
}
var StartPos = S.Position;
int count = S.Read(buffer, 0, buffer.Length);
Cont = count == buffer.Length;
for (var i = 0; i < count - SEQ.Length; i++)
{
//Don't bother doing anything if the first character is no match
if (SEQ[0] == buffer[i])
{
for (var j = 0; j < SEQ.Length; j++)
{
if (SEQ[j] != buffer[i + j])
{
break;
}
else if (j == SEQ.Length - 1)
{
Log.Write("WaveFinder: Found audio at {0}", S.Position - count + i);
var LastPos = S.Position;
//Found wave chunk, go to start of it
S.Seek(StartPos + i - 8, SeekOrigin.Begin);
var Info = new WaveFileInfo()
{
FilePosition = StartPos + i - 8,
Header = new WAVHeader(S)
};
//This is always 1 for some reason in Satisfactory
Log.Write("WaveFinder: Audio channel count: {0}", Info.Header.ChannelCount);
//Info.Header.ChannelCount = 2;
S.Seek(Info.Header.DataOffset, SeekOrigin.Begin);
if (IsOgg(S))
{
Info.Type = WaveFileType.OGG;
}
else if (Info.Header.SampleRate == 44100 && Info.Header.BitsPerSample == 16)
{
Info.Type = WaveFileType.PCM;
}
else
{
Info.Type = WaveFileType.Invalid;
}
//Remove overlapping section
//This means the Wave file was inside another wave file
if (Overlaps(Info, Files.LastOrDefault()))
{
Log.Write("WaveFinder: Removed overlapping WAV segment at NEW={0}; OLD={1}", Info.FilePosition, Files.Last().FilePosition);
Files.RemoveAt(Files.Count - 1);
}
Files.Add(Info);
//Restore stream position
S.Seek(LastPos, SeekOrigin.Begin);
}
}
}
}
}
T = null;
}
