Marc Lehmann > Video-Capture-V4l > Video::Capture::VBI

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Video-Capture-V4l-0.902.tar.gz

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Module Version: 0.05   Source  

NAME ^

Video::Capture::VBI - Functions to manipulate vbi fields & lines.

SYNOPSIS ^

   use Video::Capture::VBI;

DESCRIPTION ^

new

Create a new VBI decoder object. VBI decoding often requires state, which this object represents

reset (NYI)

Reset the state (e.g. after switching a channel).

CONSTANTS / MASK OPERATORS ^

The following constants are available (see ETS 300 706 for a more thorough definition).

   VTX_SUB 0x003f7f # S1..S4 field mask

   VTX_C4  0x000080 # erase page
   VTX_C5  0x004000 # newsflash
   VTX_C6  0x008000 # subtitle
   VTX_C7  0x010000 # suppress header
   VTX_C8  0x020000 # update indicator
   VTX_C9  0x040000 # interrupted sequence
   VTX_C10 0x080000 # inhibit display
   VTX_C11 0x100000 # magazine serial

   VTX_C12 0x200000 # ... option ...
   VTX_C13 0x400000 # ... character ...
   VTX_C14 0x800000 # ... set

The following mask functions all take a single "CTRL" bitfield and return the corresponding subfield:

   VTX_S1  (shift    )&15 } # S1
   VTX_S2  (shift>> 4)& 7 } # S2
   VTX_S3  (shift>> 8)&15 } # S3
   VTX_S4  (shift>>12)& 3 } # S4
   VTX_NOC (shift>>21)& 7 } # national character set...
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