The ornamental design for a digitalmediaadapter, as shown and described.
FIG. 1 is a front perspective view of our design for a digital media adapter;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
The broken lines shown on the digital media adapter are included for the purpose of illustrating environmental structure and forms no part of the claimed design.