Windows Media Video (WMV) Specification and Resources

I would like to write my own cross-platform library (cod开发者_JAVA技巧ec etc..) for Windows Media Video format, so I'm looking for a specification and other papers about this video format, but I didn't found any so I'm asking you if you know about any good resources...

Note: I found the ASF specs.

As I know, there is no public official specifications of WMV codecs. You can try to view open sources from third party implementations (for example ffmpeg, VLC). In addition, there are number of codecs from WMV family, and for some of the codecs (e.g. WMV 9 Screen) I doubt, that a third party implementation exists at all.

File format of WMV is same as ASF, download ASF viewer(https://www.microsoft.com/en-in/download/confirmation.aspx?id=12826) which is a Microsoft tool to view the file structure of ASF and WMV, where you can see both formats are same.