MF_PD_ASF_MARKER attribute
Specifies the markers in an Advanced Systems Format (ASF) file. This attribute corresponds to the Marker Object in the ASF header, defined in the ASF specification.
Data type
Byte array
Remarks
This attribute applies to presentation descriptors for ASF content.
The IMFASFContentInfo::GeneratePresentationDescriptor method creates the presentation descriptor and generates this attribute from the Marker Object. The following table shows the format of the blob:
| Marker Object field | Data type | Size | Description |
|---|---|---|---|
| Markers Count | DWORD | 4 bytes | Number of markers |
| Markers | BYTE[] | Varies | Array of markers |
The first DWORD is the number of markers, followed by an array of markers. Each marker has the following format:
| Marker Object field | Data type | Size | Description |
|---|---|---|---|
| Marker Description Length | DWORD | 4 bytes | Size of the description string, in bytes, including the NULL character. |
| Marker Description | WCHAR[] | Varies | Null-terminated string that describes the marker. |
| Presentation Time | LONGLONG | 8 bytes | Presentation time of the marker, in 100-nanosecond units. |
| Send Time | LONGLONG | 8 bytes | Send time of the marker entry, in milliseconds. |
| Offset | UINT64 | 8 bytes | Offset, in bytes, into the Data Object that specifies the position of the market. |
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows Vista [desktop apps only] |
| Minimum supported server |
Windows Server 2008 [desktop apps only] |
| Header |
|
See also