olly 9a893e3003 Fix thread-safety issue using DefaultTrackOutput.
Reading the format and/or a sample needs to be done as a
single operation. Else you can have a situation where the
queue is initially empty, and this happens:

1) Read downstream format X
2) Read downstream format X (unchanged)
3) Write format Y
4) Write first sample
5) Read first sample

The first sample then appears to be format X rather than Y.

Note that readData in the SampleSource implementations always
looks roughly the same. readReset is identical in all cases.
isReady is identical in all cases now I've fixed them to be
that way. So it should be pretty easy to get DefaultTrackOutput
to implement TrackStream directly, at which point a whole load
of duplication will disappear.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=120546377
2016-06-15 19:39:11 +01:00
..