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C++ EDID library

This is a C++ library for parsing and generating EDID binaries. It's targeted against E-EDID Release A, Revision 2 with EDID structure 1.4 and CTA Extension Version 3 (as described in CTA-861-I) however the full support of them is not guaranteed.

Besides providing interfaces for working with EDID binaries in C++ applications, libedid provides bidirectional JSON adapters in order to achieve a language-independent interface.

This code is written for educational purposes. Use it on your risk.

Build procedure

The project uses CMake as a build tool and nix as a package manager.

Here is an example of build procedure for Linux:

nix-shell
cmake -B build/ .
cmake --build build/

Or just invoke

nix-build

and build output will appear in result/.

Supported blocks

The list of supported blocks of Base EDID is here in EighteenByteDescriptor.

The list of supported blocks of CTA Extension is here in CtaDataBlock.

Known issues

Development-related (TODO)

  • GitHub Actions workflows could be cleaned up.
  • Some cpplint checks are skipped (see TODOs in scripts/static_analysis.sh).
  • src/json.cc has too much boilerplate code.
  • linuxhw/EDID coverage could be indicated via GitHub Badges.
  • Rework Established Timings III multi-byte enums in the Colorimetry Data Block style.
  • Unify using of optional values in JSON Schemas.

Base EDID

  • Setting Aspect Ratio instead of Screen Size is not supported.
  • Incorrect Video input parameters bitmap and Display type for analog input type. (TODO: std::variant to distinct)
  • Display Range Limits Display Descriptor doesn't describe Secondary GTF curve and CVT data.
  • Chromaticity is not deserialized.
  • Gamma is printed in the floating-point format though BaseBlock stores it in the integer format.
  • YCbCr color encodings are named as YCrCb (in the spec also, maybe due to the order mentioned in BT.601).
  • ID Serial Number always exists even if it's all zero.
  • No UnknownDataBlock for Base EDID.

CTA Extension

  • Format-specific parameters of Short Audio Descriptors are incorrect for any audio formats except of Linear PCM.