tree eb178bcde1e3179d9040fa13c85210e18246d1ed
parent 830b8976f00c0edb2f1182b4ba70c1d50742e11b
author Yue Chen <yuec@google.com> 1535144252 -0700
committer Yue Chen <yuec@google.com> 1554499279 +0000

Fix overflow caused by large timestamps

- Save the initial user-specified timestamp and rebase all further
timestamps by this value. This makes libaom internal timestamps to
always start from zero, regardless of the user's timestamps.
- Calculate reduced timestamp conversion ratio and use it to convert
user's timestamps to libaom internal timestamps and back. The effect
of this is that integer overflow due to multiplication doesn't
happen for a much longer time.
- Turned on TestAv1Rollover in TimestampTest to verify the
issue is fixed

BUG=aomedia:2053

Change-Id: I50817acf190027b71702303501439daa9a62505c