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GeneralRe: Getting Excel sheet names Pin
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GeneralRe: Getting Excel sheet names Pin
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QuestionCall an COM Server dispinterface C++ Pin
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AnswerRe: Call an COM Server dispinterface C++ Pin
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QuestionWMP SDK 11 audio and video file DRM and attribute querying Pin
Barney Wray29-Sep-09 6:17
Barney Wray29-Sep-09 6:17 
Hi - thanks in advance for any enlightenment you can provide!!

I have a basic C# app running on XP SP2, using the Media Player 11 SDK download.   Code looks like the following...

- The PROBLEM is that this runs OK for a WMA audio file, but throws for a WMV file on the line
drm.GetDRMProperty( strWMDRM_ActionAllowed_Playback,...   with HRESULT 0xC00D002B, which is NS_E_INVALID_REQUEST

- so the QUESTIONs:
1) The IsDRM attribute that I can query on the WMA, which I found in the SDK drmexternals.h, Why is this not anywhere
in the SDK sample code, or elsewhere in the SDK includes?   It is not documented in Microsoft's media attributes lists either.

2) Where can I get better info regarding audio vs video file attribute and DRM querying in C++ or C#?

3) How can I query WMV for playability and protection, as I have working for WMA?

code....

<pre>
// File attributes to be queried
public string strATTR_IsProtected = "Is_Protected";

// DRM properties to be queried
// This works for wma, but not wmv??   Do not see this in the DRM attribute list in Help.
public string strWMDRM_IsDRM     = "IsDRM";

public string strWMDRM_ActionAllowed_Playback = "ActionAllowed.Play";
public string strWMDRM_DRMHeader_LicenseAcqURL = "DRMHeader.LAINFO";


private void OnPickAudioFileToPlay(object sender, EventArgs e)
{
     OpenFileDialog openFileDlg = new OpenFileDialog();

     openFileDlg.InitialDirectory = "c:\\";
     openFileDlg.Filter = "WMA files (*.wma)|*.wma|MP3 files (*.mp3)|*.mp3|All files (*.*)|*.*";
     openFileDlg.FilterIndex = 0;
     openFileDlg.RestoreDirectory = true;

     checkBoxFileProtected.Checked = false;

     DialogResult dr = openFileDlg.ShowDialog();
     if (DialogResult.OK == dr)
     {
          string file = openFileDlg.FileName;

          // Get properties
          // from wmsdkidl.h
          // static const WCHAR g_wszWMProtected[] =L"Is_Protected";

          IWMMetadataEditor editor;
          IWMHeaderInfo3 hi3;
          IWMDRMEditor drm;

          bool bLocked = false;
          uint iRes;

          try
          {
               iRes = WMFSDKFunctions.WMCreateEditor(out editor);
               bool bProtected = false;
               string strDistributedBy = null;

               editor.Open(file);
               hi3 = (IWMHeaderInfo3)editor;

               ushort wAttribValueLen = 4;
               byte[] pbAttribValue = new Byte[wAttribValueLen];

               WMT_ATTR_DATATYPE wAttribType;
               ushort pwStreamNum = 0;

               iRes = hi3.GetAttributeByName(
                    ref pwStreamNum,
                    strATTR_IsProtected,
                    out wAttribType,
                    pbAttribValue,
                    ref wAttribValueLen);

               bProtected = BitConverter.ToBoolean(pbAttribValue, 0);

               drm = (IWMDRMEditor)editor;

               iRes = drm.GetDRMProperty(
                    strWMDRM_ActionAllowed_Playback,
                    out wAttribType,
                    pbAttribValue,
                    ref wAttribValueLen);

               bLocked = (!BitConverter.ToBoolean(pbAttribValue, 0));

               checkBoxFileProtected.Checked = bProtected;
               checkBoxFileLocked.Checked = bLocked;

               if (bLocked)
               {
                    pbAttribValue = null;

                    iRes = drm.GetDRMProperty(
                         strWMDRM_DRMHeader_LicenseAcqURL,
                         out wAttribType,
                         pbAttribValue,
                         ref wAttribValueLen);

                    pbAttribValue = new byte[wAttribValueLen];

                    iRes = drm.GetDRMProperty(
                         strWMDRM_DRMHeader_LicenseAcqURL,
                         out wAttribType,
                         pbAttribValue,
                         ref wAttribValueLen);

                    if (2 &lt; wAttribValueLen)
                    {
                         if ((0xFE == Convert.ToInt16(pbAttribValue[0])) &amp;&amp;
                              (0xFF == Convert.ToInt16(pbAttribValue[1])))
                         {
                              // UTF-16LE BOM+
                              if (4 &lt;= wAttribValueLen)
                              {
                                   for (int i = 0; i &lt; pbAttribValue.Length - 2; i += 2)
                                   {
                                        strDistributedBy += Convert.ToString(BitConverter.ToChar(pbAttribValue, i));
                                   }
                              }
                         }
                         else if ((0xFF == Convert.ToInt16(pbAttribValue[0])) &amp;&amp;
                                      (0xFE == Convert.ToInt16(pbAttribValue[1])))
                         {
                              // UTF-16BE BOM+
                              if (4 &lt;= wAttribValueLen)
                              {
                                   for (int i = 0; i &lt; pbAttribValue.Length - 2; i += 2)
                                   {
                                        strDistributedBy += Convert.ToString(BitConverter.ToChar(pbAttribValue, i));
                                   }
                              }
                         }
                         else
                         {
                              for (int i = 0; i &lt; pbAttribValue.Length - 2; i += 2)
                              {
                                   strDistributedBy += Convert.ToString(BitConverter.ToChar(pbAttribValue, i));
                              }
                         }
                    }
               }

               textBoxDistributedBy.Text = strDistributedBy;

          }
          catch( System.Runtime.InteropServices.COMException ex)
          {
               Console.WriteLine( ex.Message );
               return;
          }

          // Play file...
          if (! bLocked)
          {
               textPlayAudioFile.Text = file;
               axWindowsMediaPlayer1.URL = file;
          }

     }

}     // END pick file to play

<\pre>
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