---
name: "Video::Capture::VBI"
section: "3pm"
platform: "linux"
package: "libvideo-capture-v4l-perl"
version: "0.902-6"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Video::Capture::VBI"
---

# Video::Capture::VBI(3pm)

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...
```