Overview
IEC 62942:2019 specifies a standardized file format for the professional transfer and exchange of digital audio data. Commonly referenced as a Broadcast Wave File (BWF) profile of the RIFF/WAVE format, the standard targets professional recording, production, post‑production and archiving workflows. It defines how PCM‑coded audio and associated metadata are packaged to ensure interoperability between compliant equipment and systems.
Key topics and requirements
- BWF structure and chunks: Defines the use of the RIFF/WAVE container and the broadcast audio extension chunk (bext) for metadata. Annex A contains normative details on the RIFF WAVE format and PCM structure.
- Metadata fields: Specifies standardized metadata such as originator, recording date, coding history, loudness parameters and identifiers (e.g., USID examples in Annex I and CodingHistory syntax in Annex J).
- Multi‑channel and channel assignment: Guidance on channel usage, packing and assignments for multi‑channel files (informative Annex D).
- Filename and character set rules: Conventions and restrictions for filenames (Annex C).
- Extended file format (BWF‑E / RF64): Optional support for 64‑bit addressing to permit files larger than 4 GB; compatibility rules between conventional BWF and extended RF64/WAVE are given in Annex F.
- Universal extension (ubxt): A universal broadcast audio extension chunk is specified (Annex K) to enable broader metadata interoperability.
- Loudness parameters and rounding rules: Normative handling of loudness metadata (Annex H).
- Interoperability focus: Derived from AES31‑2, with compatibility to EBU Tech 3285, ITU‑R BR.1352 variants and BWF‑J.
Applications and who uses it
- Audio engineers and post‑production facilities: Ensures exchanged files retain accurate metadata and sample integrity across DAWs, mastering suites and editorial systems.
- Archives and libraries: Secure, metadata‑rich packaging for long‑term preservation of master audio.
- Broadcast and production houses: Reliable transfer of loudness metadata, coding history and channel assignments between systems.
- Manufacturers and software developers: Implementers of recording devices, file converters, ingest systems and asset management platforms seeking interoperability with professional workflows.
Related standards
- AES31‑2 (source influence)
- EBU Tech 3285 series (compatibility)
- ITU‑R BR.1352 (variants)
- BWF‑J (Japan Post Production Association extension)
IEC 62942:2019 is a practical, implementation‑oriented standard that promotes consistent file interchange of PCM audio and rich metadata across professional audio ecosystems. Keywords: IEC 62942:2019, Broadcast Wave Format, BWF, RIFF, WAVE, PCM, RF64, BWF‑E, professional audio, metadata, archival.