tree 084c8f7baf4ecb8236a48c32afd247783dd16500
parent bf72631a10c14630282ad0da6b5f0a0215f9480a
author Jiwen 'Steve' Cai <jwcai@google.com> 1498867468 -0700
committer Jiwen 'Steve' Cai <jwcai@google.com> 1498867468 -0700

dvrReadBufferQueueDequeue: allow empty metadata

Currently, when there is no metadata on the read buffer queue, we have
to pass in dummy out_metadata; otherwise the API always return
-EINVAL. This CL allows (nullptr, 0) as legit input and add test to
cover that.

Bug: 62958474
Test: Ran the updated DvrBufferQueueTest
Change-Id: I0ad666006a5d93b67a48b9c34f27e325dfa9a419