Video::Capture::VBI.3pm

Langue: en

Version: 2005-11-06 (debian - 07/07/09)

Section: 3 (Bibliothèques de fonctions)

Sommaire

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...