This is the part one.
- Let CameraSource be a MediaBufferObserver. It releases the recording frame when the ref count of a MediaBuffer containing
the recording frame drops to 0.
This reduces the CPU load from 90+% down to 50-60%.
Part two is related to the avoidance of copying the input video frames to the video encoder.
However, we are not able to use OMX_UseBuffer directly. Still work on the second part.
Change-Id: I906f1d054ae8bdcf82e1617f1fc120152f2eb2eb
dfb1dd6a8c