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The following attribute names and global pointers have been defined for use in this SDK.
| Attribute name | Global pointer | Description |
| Title | g_wszWMTitle | The attribute value is a string containing the content title. |
| Author | g_wszWMAuthor | The attribute value is a string containing the name of the content author. |
| Description | g_wszWMDescription | The attribute value is a string containing a description of the content. |
| Rating | g_wszWMRating | The attribute value is a string containing a content rating. |
| Copyright | g_wszWMCopyright | The attribute value is a string containing a content copyright message. |
| Duration | g_wszWMDuration | The attribute value is a double word value containing the playing duration of the file, in 100-nanosecond units. |
| Bitrate | g_wszWMBitrate | The attribute value is a double word value containing the bit rate. |
| Seekable | g_wszWMSeekable | The attribute value contains a Boolean value denoting that the content is seekable. |
| Broadcast | g_wszWMBroadcast | The attribute value contains a Boolean value denoting that the content is not copyright-protected, and can be broadcast. |
| Use_DRM | g_wszWMUse_DRM | The attribute value contains a Boolean value. When set to True, it means this content must be encrypted so that it can only be played back on the local computer. When set to False (the default), it means the content must not be encrypted. |
| DRM_Flags | g_wszWMDRM_Flags | The attribute value contains a double word value. When this value is set to WMT_RIGHT_PLAYBACK (1), the content can only be played back on the local computer. The content can be copied to a portable playback device by bitwise OR'ing DRM_Flags with WMT_RIGHT_COPY_TO_PORTABLE (2). Decompressed data can be copied to a compact disc by bitwise OR'ing DRM_Flags with WMT_RIGHT_COPY_TO_CD (8). The default value of this attribute is for all three right flags to be set. |
| DRM_Level | g_wszWMDRM_Level | The attribute value contains a double word indicating the security level that the calling application must have to use this content. The default value is 150. If you set the value higher than 1000, Microsoft® Windows Media™ Player cannot play the content. If it is set at 500, clear text devices (those in which the content is decrypted by an application using this SDK, and sent to the device without any encryption) cannot play the content. |
| Is_Protected | g_wszWMProtected | The attribute value contains a Boolean value indicating that the content was encrypted using DRM. |
| Is_Trusted | g_wszWMTrusted | The attribute value contains a Boolean value indicating that the header for the content was digitally signed, and that the signature is trusted by this computer. |
| Signature_Name | g_wszWMSignature_Name | The attribute value contains a string. If Is_Trusted is set to True, this attribute returns the name from the certificate with which the content was signed. |
| WM/AlbumTitle | g_wszWMAlbumTitle | The attribute value contains a string with the album title. |
| WM/Track | g_wszWMTrack | The attribute value contains the track number. |
| WM/PromotionURL | g_wszWMPromotionURL | The attribute value contains a string with a URL to an HTML page that contains information about products and events (such as concerts) that are related to this music. |
| WM/AlbumCoverURL | g_wszWMAlbumCoverURL | The attribute value contains a string with a URL to an HTML page that contains an image of the album cover and information about the album. |
| WM/Genre | g_wszWMGenre | The attribute value contains a string with the genre of the music. |
| WM/Year | g_wszWMYear | The attribute value contains a string with the year of publication of the music. |
Remarks
To use the attribute names, a developer can code, for example, either SetAttribute(L"Title",...) or SetAttribute(g_wszWMTitle,...). Both methods are identical, but the advantage of the second method is that it returns a compile time error if there is a spelling mistake in the global pointer. The L prefix in the attribute name specifies that the name in quotation marks is a wide-character string.
The attributes Duration, Bitrate, Seekable, Broadcast, Is_Protected, Is_Trusted and Signature_Name cannot be set by the SetAttribute method. If this is attempted, the error code E_FAIL is returned. These values are known or calculated by the system software, and are not stored in the header in the same way as other attributes. These values can be retrieved by GetAttributeByName or GetAttributeByIndex.
See Also
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