private FlacMetadata CreateFlacMetadataInstance(FlacMetaDataType flacMetadataType)
{
var flacMetadataTypeAsInt = (int)flacMetadataType;
if (!_registeredmetadataTypes.TryGetValue(flacMetadataTypeAsInt, out var type))
{
return(new DefaultFlacMetadata(flacMetadataType));
}
return((FlacMetadata)Activator.CreateInstance(type));
}
public unsafe static FlacMetadata FromStream(Stream stream)
{
bool lastBlock = false;
FlacMetaDataType type = FlacMetaDataType.Undef;
int length = 0;
byte[] b = new byte[4];
if (stream.Read(b, 0, 4) <= 0)
{
throw new FlacException(new EndOfStreamException("Could not read metadata"), FlacLayer.Metadata);
fixed(byte *headerBytes = b)
{
FlacBitReader bitReader = new FlacBitReader(headerBytes, 0);
lastBlock = bitReader.ReadBits(1) == 1;
type = (FlacMetaDataType)bitReader.ReadBits(7);
length = (int)bitReader.ReadBits(24);
////1000 0000
//if (((b[0] & 0x80) >> 7) == 1)
// lastBlock = true;
//type = (FlacMetaDataType)(b[0] & 0x7F);
//int length = (b[1] + (b[2] << 8) + (b[3] << 16));
}
FlacMetadata data;
long streamStartPosition = stream.Position;
if ((int)type < 0 || (int)type > 6)
return(null); }
else
{
switch (type)
{
case FlacMetaDataType.StreamInfo:
data = new FlacMetadataStreamInfo(stream, length, lastBlock);
break;
case FlacMetaDataType.Seektable:
data = new FlacMetadataSeekTable(stream, length, lastBlock);
break;
default:
data = new FlacMetadata(type, lastBlock, length);
break;
}
}
stream.Seek(length - (stream.Position - streamStartPosition), SeekOrigin.Current);
return(data);
}
/// <summary>
/// Registers a new <see cref="FlacMetaDataType"/>.
/// </summary>
/// <param name="metadataType">The <see cref="FlacMetaDataType"/>.</param>
/// <typeparam name="T">The <see cref="FlacMetadata"/> object assigned to the <paramref name="metadataType"/>.</typeparam>
public void RegistermetadataType <T>(FlacMetaDataType metadataType) where T : FlacMetadata
{
RegistermetadataType <T>((int)metadataType);
}
/// <summary>
/// Initializes a new instance of the <see cref="FlacMetadata"/> class.
/// </summary>
/// <param name="metadataType">The type of the metadata.</param>
public DefaultFlacMetadata(FlacMetaDataType metadataType)
{
_metadataType = metadataType;
}
protected FlacMetadata(FlacMetaDataType type, bool lastBlock, Int32 length)
{
MetaDataType = type;
IsLastMetaBlock = lastBlock;
Length = length;
}
/// <summary>
/// Initializes a new instance of the <see cref="FlacMetadata"/> class.
/// </summary>
/// <param name="type">The type of the metadata.</param>
/// <param name="lastBlock">A value which indicates whether this is the last <see cref="FlacMetadata"/> block inside of the stream. <c>true</c> means that this is the last <see cref="FlacMetadata"/> block inside of the stream.</param>
/// <param name="length">The length of <see cref="FlacMetadata"/> block inside of the stream in bytes. Does not include the metadata header.</param>
protected FlacMetadata(FlacMetaDataType type, bool lastBlock, int length)
{
MetaDataType = type;
IsLastMetaBlock = lastBlock;
Length = length;
}