transcoder: initial version of pause/resume
- Add pause/resume in TranscoderWrapper, save paused state on pause
and use it to create new transcoder on resume.
Misc fixes:
- TranscoderWrapper::stop should only cancel transcoder if the stop
is for the currently running job. Scheduler could call stop to
cancel a job any time.
- Don't hold TranscoderWrapper lock when running event runnable. If
the runnable calls back into scheduler, and scheduler may call
transcoder again and deadlock.
- Don't report abort as error if the transcoder is cancelled explicitly.
- Push decoder/encoder start as msgs, so that they could be skipped too
if the job is cancelled shortly after starts.
Tests:
Add tests for cancel/pause/resume with real transcoder.
bug: 154734285
bug: 154733948
test: unit testing
Change-Id: I2b7d3da69df53b92ab351db455310799ba0e0e8f
16 files changed