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VANC Processing Framework
C C++ Other
Branch: master
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Libklvanc is a library which can be used for parsing/generation of Vertical Ancillary Data (VANC) commonly found in the Serial Digital Interface (SDI) wire protocol.

The library includes a general parser/decoder and an encoder for VANC lines, as well as the ability to both decode and generate protocols commonly found in SDI, including:

  • CEA-708 closed captions
  • Active Format Descriptor (AFD)
  • SCTE-104 Ad triggers
  • SMPTE 2038 arbitrary VANC encapsulation

By providing both encoders and decoders, the library can be used for common use cases involving both capture of SDI (and subsequent decoding) as well as generation of VANC for inclusion in an SDI output interface. This includes computing/validating checksums at various levels and dealing with subtle edge cases related to VANC line formatting such as ensuring packets are contiguous.

The library also provides utility functions for various colorspaces VANC may be represented in, including the V210 format typically used by BlackMagic Decklink SDI cards.

Beyond this Readme.MD file, API level documentation can be generated via Doxygen (see "Making Documentation" section below).

Users should refer to the "tools" subdirectory for some example applications which make use of the library. Note that these tools depend on the Decklink API headers since they generally interact with a real SDI card. The library itself has no dependency on the Decklink API, but the example tools do.


See the included lgpl-2.1.txt for the complete license agreement.


  • ncurses (optional)
  • zlib-dev
  • Doxygen (if generation of API documentation is desired)


./ --build
./configure --enable-shared=no

Making Documentation:

To make doxygen documentation in the doxygen folder, run the following command:

    make docs

To view the documentation, cd into the doxygen/html/ directory and open the index.html file in a browser window.

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