public static void TestRead_FixedBitrate()
{
using (MemoryStream stream = new MemoryStream(mp3FixedBitrate))
{
MP3Header header = new MP3Header();
header.Read(stream, 4341760);
Debug.Assert(header.BitRate == 128);
Debug.Assert(header.FileSize == 4341760);
Debug.Assert(header.HasVBR == false);
Debug.Assert(Math.Abs(header.LengthInSeconds - 271.36) < 0.01);
Debug.Assert(header.Mode == MP3Header.Modes.JointStereo);
}
}
public static void TestRead_VariableBitrate()
{
using (MemoryStream stream = new MemoryStream(mp3VBR))
{
MP3Header header = new MP3Header();
header.Read(stream, 1171900);
Debug.Assert(header.BitRate == 185);
Debug.Assert(header.FileSize == 1171900);
Debug.Assert(header.HasVBR == true);
Debug.Assert(header.LengthInSeconds == 50.67675675675676);
Debug.Assert(header.Mode == MP3Header.Modes.JointStereo);
}
}
public static int ReadBitrate(Stream stream, long dataLength)
{
MP3Header h = new MP3Header();
h.Read(stream, dataLength);
if (h.IsValidHeader())
{
return(h.BitRate);
}
else
{
return(-1);
}
}
public static int LoadFileLengthFromMp3(string file, MpegDataSize sizeProvider, MpegSkipBytes skipBytes)
{
using (Stream stream = VirtualDrive.OpenInStream(file))
{
MP3Header mp3hdr = new MP3Header();
FileInfo fileInfo = new FileInfo(file);
stream.Seek(skipBytes(fileInfo), SeekOrigin.Current);
bool boolIsMP3 = mp3hdr.Read(stream, sizeProvider(fileInfo));
if (boolIsMP3)
{
return((int)Math.Round(mp3hdr.LengthInSeconds));
}
else
{
return(0);
}
}
}
