public static MetadataBlock New(FlacStream stream)
{
MetadataBlockHeader header = new MetadataBlockHeader();
header.Read(stream);
MetadataBlock block = GetBlock(header);
block.Read(stream);
return block;
}
private static MetadataBlock GetBlock(MetadataBlockHeader header)
{
MetadataBlock block;
switch (header.BlockType)
{
case 0:
{
block = new MetadataBlockStreamInfo(header);
break;
}
case 1:
{
block = new MetadataBlockPadding(header);
break;
}
case 2:
case 3:
case 4:
case 5:
case 6:
{
// we won't read any block except streaminfo
// skip over them all.
// think of them as padding.
block = new MetadataBlockPadding(header);
break;
}
case 127:
{
throw new FlacFormatInvalidException();
}
default:
{
throw new FlacFormatReservedException();
}
}
return block;
}
protected MetadataBlock(MetadataBlockHeader header)
{
header_ = header;
}
public MetadataBlockPadding(MetadataBlockHeader header)
: base(header)
{
}
public MetadataBlockStreamInfo(MetadataBlockHeader header)
: base(header)
{
}
public MetadataBlockVorbisComment(MetadataBlockHeader header, byte [] blockData)
: base(header)
{
blockData_ = blockData;
}
private void ReadHeader()
{
outStream_.Encode();
inStream_.Reader.Seek(4);
MetadataBlockHeader h = new MetadataBlockHeader();
h.Read(inStream_);
MetadataBlockStreamInfo si = new MetadataBlockStreamInfo(h);
si.Read(inStream_);
h.IsLastMetadataBlock = false;
si.MinBlockSize = track_.MinBlockSize;
si.MaxBlockSize = track_.MaxBlockSize;
si.MinFrameSize = track_.MinFrameSize;
si.MaxFrameSize = track_.MaxFrameSize;
si.TotalSamples = track_.TotalSamples;
si.Checksum[0] = 0;
si.Checksum[1] = 0;
si.Checksum[2] = 0;
si.Checksum[3] = 0;
si.Write(outStream_);
long pos = outStream_.FileStream.Position;
h = new MetadataBlockHeader();
h.IsLastMetadataBlock = true;
h.BlockLengthInBytes = track_.Metadata.block.Length;
h.BlockType = MetadataBlockHeader.METADATA_BLOCK_VORBIS_COMMENT;
MetadataBlockVorbisComment vc = new MetadataBlockVorbisComment(h, track_.Metadata.block);
vc.Write(outStream_);
Debug.Assert(outStream_.FileStream.Position == pos + h.BlockLengthInBytes + 4);
outStream_.FileStream.Flush();
header_ = ReadAllBytes();
}
