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

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


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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