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WMP Error - Contact Content Provider

, 29 Aug 2005
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A set of error codes from raw_GetLicenseFromURL() of Windows Media Player API.

Introduction

I bet you see this quite often: Error code: 0xFFF00XXX blah, blah, blah if it does not help please contact your system administrator or, in case of Windows Media Player (WMP), your content provider. But what if you are that system administrator or content provider people should contact. What do you do then? You "Google" the error code and few things come up. You dismiss those search results that say to contact you and … nothing is left. It happened to me when I worked on DRM license acquisition for WMP. In this article, I would like to share my research about specific DRM error codes.

Background

Recently, as I already mentioned, I have been working with Microsoft DRM. My task was to deliver a license to a user’s desktop from a license server. Only one license was allowed per media file. If a user is not eligible to receive anymore licenses the license server would send an HTTP response with 403 status code and nicely crafted error massage in its context. Please note that DRM license acquisition utilizes HTTP.

I thought I could just simply display the error message that came with the HTTP response to the user. It would provide a pleasant experience to the user by explaining nicely and clearly about the encountered problem. It will also make me happy, as I'll able to make a simple and elegant solution. "Not so fast cowboy" – stated the WMP API – "I will give you only an error code, no access to HTTP header or/and context whatsoever, gee, and now try to figure out what those error codes mean". I can still hear its giggling.

WMP errors

I decided to conduct a simple experiment. On every license request from a user’s desktop I would send a response from an HTTP server with different HTTP status code and see what error code WMP returns.

Here is the C code that I used to request DRM licenses:

#define CLEANLICOBJ     pLicense->Release(); \
                        CoUninitialize()
                        
HRESULT GetLicenses() 
{
    CoInitialize(NULL);

    IRMGetLicense* pLicense = NULL;
    HRESULT hr = CoCreateInstance( 
                   __uuidof(RMGetLicense), 
                   NULL, CLSCTX_INPROC_SERVER, 
                   __uuidof(IRMGetLicense), 
                   (void**)&pLicense);

    if(FAILED(hr)) 
    {
        return hr;
    }

    CComBSTR bstrXMLDoc, bstrDRMVersion, bstrURL;

    hr = pLicense->raw_GetDRMVersion(&bstrDRMVersion);
    if(FAILED(hr)) 
    {
        CLEANLICOBJ;
        return hr;
    }

    hr = pLicense->raw_GetSystemInfo(&bstrXMLDoc); 
    if(FAILED(hr)) 
    {
        CLEANLICOBJ;
        return hr;
    }

    char url[1024];
    for( int i = 0; i < STATUSCODESMAX; i++ )
    {
        sprintf(url, 
          "http://localhost/HttpErrorProducer/default.aspx?statuscode=%d", 
          httpStatusCode[i].StatusCode);
        bstrURL.Append(url);
        hr = pLicense->raw_GetLicenseFromURL(bstrXMLDoc, bstrURL);
        printf("\n0x%X\t\t%d\t%s", hr, 
                              httpStatusCode[i].StatusCode, 
                              httpStatusCode[i].ReasonPhrase);
        bstrURL.Empty();
    }
    CLEANLICOBJ;
    return S_OK;
}

Here is an excerpt of ASP.NET server side code:

protected void Page_Load(object sender, EventArgs e)
{
    int code = Convert.ToInt32(Request["statuscode"]);
    HttpStatusCode statusCode = 
                       HttpStatusCode.GetStatus(code);
    Response.StatusCode = statusCode.StatusCode;
    Response.Write(statusCode.ReasonPhrase);
}

Now this is the time for the error codes:

Error Code HTTP Status Code HTTP Reason Phrase
0xC00D2712 200 OK
0xC00D275E 201 Created
0xC00D275E 202 Accepted
0xC00D275E 203 Non-Authoritative Information
0xC00D275E 204 No Content
0xC00D275E 205 Reset Content
0xC00D275E 206 Partial Content
0xC00D275E 300 Multiple Choices
0x80072F76 301 Moved Permanently
0x80072F76 302 Moved Temporarily
0xC00D275E 303 See Other
0xC00D275E 304 Not Modified
0xC00D275E 305 Use Proxy
0xC00D275E 400 Bad Request
0xC00D2EFB 401 Unauthorized
0xC00D275E 402 Payment Required
0xC00D2EFB 403 Forbidden
0xC00D2EE6 404 Not Found
0xC00D2EE3 405 Method Not Allowed
0xC00D275E 406 Not Acceptable
0xC00D2EF6 407 Proxy Authentication Required
0xC00D2EE6 408 Request Time-out
0xC00D275E 409 Conflict
0xC00D275E 410 Gone
0xC00D275E 411 Length Required
0xC00D275E 412 Precondition Failed
0xC00D275E 413 Request Entity Too Large
0xC00D275E 414 Request-URI Too Large
0xC00D275E 415 Unsupported Media Type
0xC00D2EE2 500 Internal Server Error
0xC00D275E 501 Not Implemented
0xC00D2EE4 502 Bad Gateway
0xC00D2EE6 503 Service Unavailable
0xC00D2EE5 504 Gateway Time-out
0xC00D275E 505 HTTP Version not supported

HTTP Status code 100 – "Continue" and 101 - "Switching Protocols" are not included as they would hang HTTP communication as they are suppose to.

The following error codes are worth noticing:

  • 0xC00D2712: WMP has not received a license blob.
  • 0xC00D2EFB: WMP likely has no credentials required to access to the server.
  • 0xC00D2EE6: more likely to occur when WMP hits a wrong URL.
  • 0xC00D2EE2: it is definitely time to contact the content provider!.
  • 0xC00D275E: just very popular ;~).

Conclusion

I hope this article sheds some light on WMP error codes. Also you can find a sample of C code to request a license from a DRM server.

References

Please check these useful links for Windows Media Player error codes:

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

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About the Author

Andrew Chabokha
Systems Engineer
Canada Canada
No Biography provided

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