[android-developers] Camera and Encoder related thread query

Dear Experts,

In case of video recording, there would be 3 major players in the flow
graph i.e. Camera Source, Encoder encapsulated as an OMXCodec
component and MPEG4 Writer. I am referring to the one the latest
versions of code from android GIT and I have this doubt.

- Each of these components read data from the predecessor through
mSource->read.

- MPEG4 Writer spawns off separate threads for writing tracks.

- However, I couldn't observe that CameraSource and OMXCodec are
running in different threads. From my current understanding, I presume
that both of these components run in same thread, probably in a
sequential manner.

Hence, my doubts are:

1) Is my current understanding correct or have I missed out any detail/
implementation related to threads?

2) Since the default implementation is a stub, is it expected/assumed
that the Camera HAL implementation would implement a thread of it's
own, thereby decoupling the capture from the OMXCodec in terms of
picture capture.

Please help me to correct my misunderstandings. Thanks for your help.

Best Regards,
Ganesh

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