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Time at start of exposure of first row of the image sensor active array, in nanoseconds.
The timestamps are also included in all image buffers produced for the same capture, and will be identical on all the outputs.
When CameraCharacteristics.SensorInfoTimestampSource== UNKNOWN, the timestamps measure time since an unspecified starting point, and are monotonically increasing. They can be compared with the timestamps for other captures from the same camera device, but are not guaranteed to be comparable to any other time source.
When CameraCharacteristics.SensorInfoTimestampSource== REALTIME, the timestamps measure time in the same timebase as android.os.SystemClock#elapsedRealtimeNanos(), and they can be compared to other timestamps from other subsystems that are using that base.
Units: Nanoseconds
Range of valid values:
> 0
This key is available on all devices.