BLACKMAGIC Pocket Cinema Camera 6K (CINECAMPOCHDEF6K) - Инструкция по эксплуатации - Страница 146

Data types 6 through 127 are reserved. 

128: signed 5.11 fixed point

Data elements are signed 16 bit integers representing a real number with 
5 bits for the integer component and 11 bits for the fractional component. 
The fixed point representation is equal to the real value multiplied by 2^11. 
The representable range is from -16.0 to 15.9995 (15 + 2047/2048).

Data types 129 through 255 are available for device specific purposes.

Operation type (uint8)

The operation type specifies what action to perform on the specified 
parameter. Currently defined values are:

0: assign value

The supplied values are assigned to the specified parameter. Each element 
will be clamped according to its valid range. A void parameter may only be 
'assigned' an empty list of boolean type. This operation will trigger the action 
associated with that parameter. A boolean value may be assigned the value 
zero for false, and any other value for true.

1: offset / toggle value

Each value specifies signed offsets of the same type to be added to the 
current parameter values. The resulting parameter value will be clamped 
according to their valid range. It is not valid to apply an offset to a void value. 
Applying any offset other than zero to a boolean value will invert that value.

Operation types 2 through 127 are reserved.

Operation types 128 through 255 are available for device specific purposes.

Data (void)

The data field is 0 or more bytes as determined by the data type and number 
of elements.

The category, parameter, data type and operation type partition a 24 bit operation space.

Group

ID

Parameter

Type

Index

Minimum

Maximum

Interpretation

Lens

0.0 Focus

fixed16

–

0.0

1.0

0.0 = near, 1.0 = far

0.1

Instantaneous autofocus

void

–

–

–

trigger instantaneous autofocus

0.2 Aperture (f-stop)

fixed16

–

-1.0

16.0

Aperture Value (where fnumber 

= sqrt(2^AV))

0.3 Aperture (normalised)

fixed16

–

0.0

1.0

0.0 = smallest, 1.0 = largest

0.4 Aperture (ordinal)

int16

–

0

n

Steps through available aperture 

values from minimum (0) to 

maximum (n)

0.5 Instantaneous auto aperture void

–

–

–

trigger instantaneous auto 

aperture

0.6 Optical image stabilisation

boolean

–

–

–

true = enabled, false = disabled

0.7

Set absolute zoom (mm)

int16

–

0

max

Move to specified focal length 

in mm, from minimum (0) to 

maximum (max)

0.8 Set absolute zoom 

(normalised)

fixed16

–

0.0

1.0

Move to specified focal length: 

0.0 = wide, 1.0 = tele

0.9 Set continuous zoom 

(speed)

fixed16

–

-1.0

+1.0

Start/stop zooming at specified 

rate: -1.0 = zoom wider fast, 0.0 

= stop,  

+1 = zoom tele fast

1240

Developer Information