Blackmagicdesign Studio Camera - Page 343

Defined Commands
Command 0 : change configuration
Category (uint8)
The category number specifies one of up to 256 configuration categories
available on the device.
Parameter (uint8)
The parameter number specifies one of 256 potential configuration
parameters available on the device. Parameters 0 through 127 are device
specific parameters. Parameters 128 though 255 are reserved for parameters
that apply to multiple types of devices.
Data type (uint8)
The data type specifies the type of the remaining data. Thepacket length is
used to determine the number of elements in the message. Each message
must contain an integral number of data elements.
Currently defined values are:
0: void / boolean
A void value is represented as a boolean array of length zero.
The data field is a 8 bit value with 0 meaning false and all other values
meaning true.
1: signed byte Data elements are signed bytes
2: signed 16bit integer Data elements are signed 16 bit values
3: signed 32bit integer Data elements are signed 32 bit values
4: signed 64bit integer Data elements are signed 64 bit values
5: UTF-8 string Data elements represent a UTF-8 string with no terminating character.
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.
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