Apply best seeking strategy for MP3

ExoPlayer provides options to enable index-based seeking and constant bitrate seeking, but in order to choose an appropriate strategy for some arbitrary media file (e.g. an arbitrary URL not under the control of the app developer), it would be necessary to first know whether the file has a precise or approximate seek table, or in the absence of any seek table, whether it is encoded with a VBR. How is an app developer expected to best query these things in order to choose an appropriate seek strategy for a given file? Is there any way ExoPlayer could make this easier?