cam: Implement OptMetadata

Implement support for the new '--metadata' option by printing the
value of each metadata entry associated with a completed Request.

As sample of the output, running on raspberry pi, looks like the
following:

3050.205672 (30.01 fps) stream0 seq: 000033 bytesused: 720000
	ScalerCrop = (0x2)/3280x2460
	ExposureTime = 13969
	AeLocked = true
	DigitalGain = 1.000721
	Lux = 771.204224
	ColourGains = [ 1.561101, 1.629698 ]
	ColourTemperature = 4289
	SensorBlackLevels = [ 4096, 4096, 4096, 4096 ]
	ColourCorrectionMatrix = [ 1.691066, -0.599756, -0.091317, -0.437452, 1.983766, -0.546314, -0.083429, -0.722407, 1.805836 ]
	AnalogueGain = 2.000000
	SensorTimestamp = 3050205672000

3050.238999 (30.01 fps) stream0 seq: 000034 bytesused: 720000
	ScalerCrop = (0x2)/3280x2460
	ExposureTime = 13969
	AeLocked = true
	DigitalGain = 1.000709
	Lux = 771.232422
	ColourGains = [ 1.560868, 1.630029 ]
	ColourTemperature = 4289
	SensorBlackLevels = [ 4096, 4096, 4096, 4096 ]
	ColourCorrectionMatrix = [ 1.691081, -0.599726, -0.091362, -0.437497, 1.983627, -0.546130, -0.083420, -0.722523, 1.805943 ]
	AnalogueGain = 2.000000
	SensorTimestamp = 3050238999000

Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

0 files changed, 0 insertions, 0 deletions