Starting in Android U (14), libmediadrm (app-side) understands extra error details from AIDL DRM HALs passed through the binder exception message as a json string. The supported fields are:
cdmError (int)oemError (int)context (int)errorMessage (str)The errors details will be reported to apps through the java interface android.media.MediaDrmThrowable. Please see the javadoc of MediaDrmThrowable for detailed definitions of each field above.