Media MDB Object Properties (Compact 7)
3/12/2014
Media MDB Object Properties for All Object Formats
The following table lists the object properties that the Media MDB supports for all object formats.
| Object property | MTP datacode | Description |
|---|---|---|
StorageID |
0xDC01 |
The storage area on the device where the object is stored. In MTP storage, you designate only one StorageID on the device for the folders that are shared for MTP access. All MTP objects on the device have the same StorageID. |
Object Format |
0xDC02 |
An object’s format determines the properties that the object will support. The format is either 0x3000 (file) or 0x3001 (folder) and is stored implicitly in the MTP file system on the device. |
Protection Status |
0xDC03 |
The status is either 0x0000 (No Protection) or 0x8001 (Read-only data); the mapping depends on whether the object is marked read-only in the MTP file system. |
Object Size |
0xDC04 |
The size of the data component of the object, in bytes. This property is ignored for folders. |
Object File Name |
0xDC07 |
The file name of the object, including the extension, but not the path. |
Parent Object |
0xDC0B |
The object handle of the parent folder, which must be an object of the Association (0x3001) format. If the object is at the root, this value is 0xffffffff. |
Persistent Unique Object Identifier |
0xDC41 |
Although called the persistent unique object identifier (PUOID) in the MTP specification, the PUOID is not persistent between sessions in the MTP storage implementation. The PUOID is a 128-bit version of the object handle. It is not used by the computer. Because the PUOID is not persistent in the device’s Media MDB, the computer cannot rely on the PUOID to maintain data synchronization with the device. |
Name |
0xDC44 |
The value returned for a file is the file name without the path or extension. For a folder, the value returned is the folder name without the path. The value that is sent by Windows when Windows creates an object is ignored. |
Non-Consumable |
0xDC4F |
Indicates whether the object was transferred to the portable media player for storage only and is not available to be consumed (for example, played) by the portable device. The device returns 1 for files and 0 (zero) for folders. Windows does not send values for this property, but any such values would be ignored if sent. |
Date Created |
0xDC08 |
The date and time when the object was created. This value maps to the value in the MTP responder file system on the device. |
Date Modified |
0xDC09 |
The date and time when the object was last altered. This value maps to the value in the file system. |
Hidden |
0xDC0D |
Identifies whether an object is displayed to users or is hidden and only used by applications. This value maps to the value in the MTP responder file system. |
Association Type |
0xDC05 |
Describes the kind of collection. A value of 1 indicates that the Association Type is a generic folder, which is the only Association Type that MTP storage supports. This value is never sent by Windows. MTP storage ignores any values sent; returns 1 for folder and returns 0 (zero) for a file. |
AssociationDesc |
0xDC06 |
Provides additional information about the Association Type. MTP storage ignores any values sent; returns 0 (zero) for either a file or a folder. This value is never sent by Windows. |
Media MDB Object Properties by Content Format
In addition, the Media MDB supports more object properties if the object format translates to an image file, an audio file, or a video file. The following table lists the object properties that the Media MDB supports for image, audio, and video object formats.
| Object property | MTP datacode | Image | Audio | Video |
|---|---|---|---|---|
Artist |
0xDC46 |
X |
X |
|
Description |
0xDC48 |
X |
||
Representative Sample Format |
0xDC81 |
X |
||
Representative Sample Size |
0xDC82 |
X |
||
Representative Sample Height |
0xDC83 |
X |
||
Representative Sample Width |
0xDC84 |
X |
||
Representative Sample Data |
0xDC86 |
X |
||
Width |
0xDC87 |
X |
X |
|
Height |
0xDC88 |
X |
X |
|
Duration |
0xDC89 |
X |
X |
|
User Rating |
0xDC8A |
X |
X |
|
Track |
0xDC8B |
X |
X |
|
Genre |
0xDC8C |
X |
X |
|
Use Count |
0xDC91 |
X |
X |
|
Album Name |
0xDC9A |
X |
X |
|
Album Artist |
0xDC9B |
X |
X |
|
Bit Rate Type |
0xDE92 |
X |
X |
|
Sample Rate |
0xDE93 |
X |
X |
|
Number of Channels |
0xDE94 |
X |
X |
|
Scan Type |
0xDE97 |
X |
||
Audio Wave Codec |
0xDE99 |
X |
X |
|
Audio Bit Rate |
0xDE9A |
X |
X |
|
Video FourCC Codec |
0xDE9B |
X |
||
Video Bit Rate |
0xDE9C |
X |
||
Frames Per Thousand Seconds |
0xDE9D |
X |
||
Key Frame Distance |
0xDE9E |
X |
||
Encoding Profile |
0xDEA1 |
X |
||
Encoding Quality |
0xDEA0 |
X |
||
Audio Bit Depth |
0xDE95 |
X |
X |
|
DRM Protection |
0xDC9D |
X |
X |
For more information about MTP object formats and properties, see the MTP 1.0 Specification. (Opens as a .zip file.)
See Also
Concepts
MTP Storage
Media MDB MTP Operations
Media MDB Object Formats
Media MDB Implementation
Media MDB Optimization