Data Translation DT3120, User Manual

Page: 85 / 128

Chapter 4
68
Set the Standard Controls for the Input Channel
Set the input sync source with
OlFgSetInputControlValue.
Use the key OLC_FG_CTL_FRAME_HEIGHT to set
the number of lines per field of video to digitize for
the selected input channel. The default is 576 for 50
Hz and 480 for 60 Hz.
Set the height of the frame with
OlFgSetInputControlValue.
Use the key OLC_FG_CTL_VIDEO_TYPE to select
a composite sync source and
OLC_FG_CTL_CSYNC_SOURCE to specify that
the current channel provides the sync signal.
Use the key OLC_FG_CTL_FRAME_WIDTH to set
the number of pixels per line of video to digitize for the
selected input channel. The default is 786 for 50 Hz
and 640 for 60 Hz.
Set the width of the frame with
OlFgSetInputControlValue.
Return to main flowchart.
Set the top of the frame with
OlFgSetInputControlValue.
Use the key OLC_FG_CTL_FRAME_TOP to set
the first line of video, relative to the active video
area, to digitize for the selected input channel. The
default is 0.
Set the left of the frame with
OlFgSetInputControlValue.
Use the key OLC_FG_CTL_FRAME_LEFT to set
the first pixel of video, relative to the active video
area, to digitize for the selected input channel. The
default is 0.