static OggPacket GetCommentPacket(MetadataDictionary metadata)
{
Contract.Requires(metadata != null);
var comment = new VorbisComment();
try
{
SafeNativeMethods.VorbisCommentInitialize(out comment);
foreach (var item in new MetadataToVorbisCommentAdapter(metadata))
{
// The key and value need to be marshaled as null-terminated UTF-8 strings:
var keyBytes = new byte[Encoding.UTF8.GetByteCount(item.Key) + 1];
Encoding.UTF8.GetBytes(item.Key, 0, item.Key.Length, keyBytes, 0);
var valueBytes = new byte[Encoding.UTF8.GetByteCount(item.Value) + 1];
Encoding.UTF8.GetBytes(item.Value, 0, item.Value.Length, valueBytes, 0);
SafeNativeMethods.VorbisCommentAddTag(ref comment, keyBytes, valueBytes);
}
OggPacket result;
if (SafeNativeMethods.VorbisCommentHeaderOut(ref comment, out result) != 0)
{
throw new IOException(Resources.MetadataEncoderHeaderOutError);
}
return(result);
}
finally
{
SafeNativeMethods.VorbisCommentClear(ref comment);
}
}