/// <summary>
/// The total samples in the stream are read from the flac header here.
/// This can be extracted from bits 173-208 of the stream.
/// More information: https://xiph.org/flac/format.html#metadata_block_streaminfo.
/// </summary>
/// <param name="stream">The flac file stream.</param>
/// <returns>The total samples.</returns>
public static Fin <ulong> ReadTotalSamples(Stream stream)
{
long position = stream.Seek(FlacSamplesOffset, SeekOrigin.Begin);
Debug.Assert(position == 21, $"Expected stream.Seek position to return 21, instead returned {position}");
Span <byte> buffer = stackalloc byte[5];
int bytesRead = stream.Read(buffer);
if (bytesRead != buffer.Length)
{
return(FileTooShort);
}
return(BinaryHelpers.Read36BitUnsignedBigEndianIgnoringFirstNibble(buffer));
}