Osprey PCI User Guide
ViewCast
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Render
The driver can internally render closed captions on video when NTSC video is selected on the input
(Figure 38). There is a control to select which channel to render (although CC 1 is the only channel
that is commonly used).
Note: This control only affects rendering on video performed internally by the driver. The AVStream
driver has two additional ways of delivering captions.
Figure 38. Render
First, it exposes a DirectShow-standard CC pin. This pin can be used directly by applications such as
Windows Media Encoder’s scripting facility.
Second, the driver has a proprietary Closed Caption API for use by C++ developers. It delivers raw
captioning data from any CC or Text channel. It also delivers line-interpreted data from these
channels, suitable for a scripting display or for capture to an ASCII file. It also delivers XDS – “Vchip”
and other ancillary data – in raw form. The applet named CCChannels.exe that is included with the
driver release demos these capabilities.
Figure 39. Render Logical White As
The control group “Render Logical White As” maps white captions to a color other than white
(Figure 38 and Figure 39). This is a proprietary extension to the Closed Captioning standard. When
logical white is mapped to, for example, red, the CC standard captioning red also works; however, it
is not possible to distinguish “logical white” red captions from “standard colored” red captions.
Since standard colored captions are so little used, this characteristic has little practical effect.
Summary of Contents for Osprey PCI
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Page 56: ...Setting Driver Properties 50 ViewCast Figure 35 Extras...
Page 67: ...Osprey PCI User Guide ViewCast 61 Figure 46 Weighting...
Page 70: ...Setting Driver Properties 64 ViewCast...
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