public static XingHeader LoadXingHeader(Mp3Frame frame)
{
XingHeader xingHeader = new XingHeader();
xingHeader.frame = frame;
int num;
if (frame.MpegVersion == MpegVersion.Version1)
{
if (frame.ChannelMode != ChannelMode.Mono)
{
num = 36;
}
else
{
num = 21;
}
}
else
{
if (frame.MpegVersion != MpegVersion.Version2)
{
return(null);
}
if (frame.ChannelMode != ChannelMode.Mono)
{
num = 21;
}
else
{
num = 13;
}
}
if (frame.RawData[num] == 88 && frame.RawData[num + 1] == 105 && frame.RawData[num + 2] == 110 && frame.RawData[num + 3] == 103)
{
xingHeader.startOffset = num;
num += 4;
int arg_9E_0 = XingHeader.ReadBigEndian(frame.RawData, num);
num += 4;
if ((arg_9E_0 & 1) != 0)
{
xingHeader.framesOffset = num;
num += 4;
}
if ((arg_9E_0 & 2) != 0)
{
xingHeader.bytesOffset = num;
num += 4;
}
if ((arg_9E_0 & 4) != 0)
{
xingHeader.tocOffset = num;
num += 100;
}
if ((arg_9E_0 & 8) != 0)
{
xingHeader.vbrScale = XingHeader.ReadBigEndian(frame.RawData, num);
num += 4;
}
xingHeader.endOffset = num;
return(xingHeader);
}
return(null);
}
private Mp3FileReader(Stream inputStream, Mp3FileReader.FrameDecompressorBuilder frameDecompressorBuilder, bool ownInputStream)
{
if (inputStream == null)
{
throw new ArgumentNullException("inputStream");
}
if (frameDecompressorBuilder == null)
{
throw new ArgumentNullException("frameDecompressorBuilder");
}
this.ownInputStream = ownInputStream;
try
{
this.mp3Stream = inputStream;
this.Id3v2Tag = Id3v2Tag.ReadTag(this.mp3Stream);
this.dataStartPosition = this.mp3Stream.Position;
Mp3Frame mp3Frame = Mp3Frame.LoadFromStream(this.mp3Stream);
if (mp3Frame == null)
{
throw new InvalidDataException("Invalid MP3 file - no MP3 Frames Detected");
}
double num = (double)mp3Frame.BitRate;
this.xingHeader = XingHeader.LoadXingHeader(mp3Frame);
if (this.xingHeader != null)
{
this.dataStartPosition = this.mp3Stream.Position;
}
Mp3Frame mp3Frame2 = Mp3Frame.LoadFromStream(this.mp3Stream);
if (mp3Frame2 != null && (mp3Frame2.SampleRate != mp3Frame.SampleRate || mp3Frame2.ChannelMode != mp3Frame.ChannelMode))
{
this.dataStartPosition = mp3Frame2.FileOffset;
mp3Frame = mp3Frame2;
}
this.mp3DataLength = this.mp3Stream.Length - this.dataStartPosition;
this.mp3Stream.Position = this.mp3Stream.Length - 128L;
byte[] array = new byte[128];
this.mp3Stream.Read(array, 0, 128);
if (array[0] == 84 && array[1] == 65 && array[2] == 71)
{
this.Id3v1Tag = array;
this.mp3DataLength -= 128L;
}
this.mp3Stream.Position = this.dataStartPosition;
this.Mp3WaveFormat = new Mp3WaveFormat(mp3Frame.SampleRate, (mp3Frame.ChannelMode == ChannelMode.Mono) ? 1 : 2, mp3Frame.FrameLength, (int)num);
this.CreateTableOfContents();
this.tocIndex = 0;
num = (double)this.mp3DataLength * 8.0 / this.TotalSeconds();
this.mp3Stream.Position = this.dataStartPosition;
this.Mp3WaveFormat = new Mp3WaveFormat(mp3Frame.SampleRate, (mp3Frame.ChannelMode == ChannelMode.Mono) ? 1 : 2, mp3Frame.FrameLength, (int)num);
this.decompressor = frameDecompressorBuilder(this.Mp3WaveFormat);
this.waveFormat = this.decompressor.OutputFormat;
this.bytesPerSample = this.decompressor.OutputFormat.BitsPerSample / 8 * this.decompressor.OutputFormat.Channels;
this.bytesPerDecodedFrame = 1152 * this.bytesPerSample;
this.decompressBuffer = new byte[this.bytesPerDecodedFrame * 2];
}
catch (Exception)
{
if (ownInputStream)
{
inputStream.Dispose();
}
throw;
}
}
