The following changes were made for 2.1.1:
- Return special TRMs for special conditions for TRM generation:
c457a4a8-b342-4ec9-8f13-b6bd26c0e400 — Sigserver busy and overloaded
f9809ab1-2b0f-4d78-8862-fb425ade8ab9 — Source file is too short to calculate TRM
7d154f52-b536-4fae-b58b-0666826c2bac — File is silence
If the TRM signature server becomes overloaded, it will now start
returning HTTP 503 error codes and the TRM generator will catch that
and return the Sigserver busy TRM shown above.