| Microsoft DirectX 8.1 (C++) |
The following table lists the globally unique identifiers (GUIDs) defined for media parameter time formats.
| GUID | Description |
| GUID_TIME_MUSIC | Music time, in parts per quarter note. |
| GUID_TIME_REFERENCE | Reference time, in 100-nanosecond units. |
| GUID_TIME_SAMPLES | Samples per second. |