| Microsoft DirectX 8.1 (C++) |
The IMediaParams interface sets and retrieves envelope-following parameters on an object.
To reduce overhead, parameters are referenced by index value, and all parameter values are 32 bits, defined as type MP_DATA. Use the IMediaParamInfo interface to determine whether a given parameter is an integer, floating-point value, Boolean value, or member of an enumerated type.
In addition to the methods inherited by IUnknown, the IMediaParams interface exposes the following methods.
| Method | Description |
| AddEnvelope | Adds an envelope to a parameter. |
| FlushEnvelope | Flushes envelope data for a specified parameter over the specified time range. |
| GetParam | Retrieves the most recent value of the specified parameter. |
| SetParam | Sets the value of a parameter. |
| SetTimeFormat | Specifies the time format for the object. |