void WriteHeader(MetadataDictionary metadata, Stream stream)
{
Contract.Requires(metadata != null);
Contract.Requires(stream != null);
Contract.Requires(stream.CanWrite);
var vorbisComment = new VorbisComment();
try
{
SafeNativeMethods.VorbisCommentInitialize(out vorbisComment);
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 vorbisComment, keyBytes, valueBytes);
}
OggPacket first;
OggPacket second;
OggPacket third;
_encoder.HeaderOut(ref vorbisComment, out first, out second, out third);
_oggStream.PacketIn(ref first);
_oggStream.PacketIn(ref second);
_oggStream.PacketIn(ref third);
}
finally
{
SafeNativeMethods.VorbisCommentClear(ref vorbisComment);
}
OggPage page;
while (_oggStream.Flush(out page))
{
WritePage(page, stream);
}
}
