SDK / exoplayer

SoftAAC2 would cause an exception to be thrown from
dequeueOutputBuffer/releaseOutputBuffer after queueing an end-of-stream buffer
for certain streams.

The bug was introduced in L and fixed in L MR1, so the workaround is targeted to
API 21.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=147613659