poka.sh

 Docs

OGG

Generated by scripts/gen-format-pages.py from docs/data/format-metadata/, FILE_FORMATS.csv and docs/formats-master.csv. Do not edit by hand: change the source, then run the script.

Symphonia Audio Decode.

At a glance
Original creator The Xiph.Org open-source project
Purpose A container for Vorbis audio and other Xiph audio and video streams.
Extensions .m4a, .flac, .oga, .ogg, .opus, .spx, .alac, .wavpack, .tak, .aif, .aiff, .wma, .wmapro, .asf, .atrac, .at3, .m4b
Poka parser poka-symphonia
Viewer none: the parser draws its own preview
Depth tier Standalone parser (see Depth tiers)
Breadth tier B5 Identification (see Breadth tiers)

How much Poka reads

B5 Identification. The format is recognised and a few properties are shown (name, size, version string). Nothing of the content is decoded.

Confidence: high (the reviewer read the code and a test that proves the claim). Basis: Reviewed 2026-10-16: .ogg and .oga are aliases of poka-symphonia, whose preview_bytes returns the POKA_MEDIA|audio marker by extension alone, without checking the OggS magic. The browser plays the original file (web/tests/audio.spec.js plays tos.ogg). Corpus has tos.ogg, Turdus_merula_2.ogg and chained-meta*.ogg; no test reads their structure. poka-opus (.opus-info only) walks Ogg pages for Opus, but no Ogg or Vorbis card exists and .ogg does not reach poka-opus. Judgement: B5 because Poka reads nothing; playback is delegated. Covers Ogg version 0 files.

What Poka does not read

  • Ogg pages and logical streams are not read (serial numbers, chaining, granule positions)
  • codec is not identified (Vorbis, Opus, FLAC, Speex, Theora)
  • Vorbis comment tags and cover art are not shown
  • duration, sample rate and channels are not shown
  • chained and multiplexed streams are left to the browser
  • no check that the file is Ogg at all
  • files the browser cannot play show only an unsupported note

Background

The Library of Congress calls Ogg a wrapper for Vorbis sound data and other bitstreams, and the Xiph site calls it a container and an encapsulation format (version 0). Poka does not decode Ogg itself: the module hands the original file to the frontend, which plays it in the browser's audio element, without checking the file first.

Versions

Version Identifier Poka Note
Ogg encapsulation format, version 0 (RFC 3533) OggS Not recorded Played by the browser, so the codecs that play are the browser's.
  • Ogg audio (.oga): Has its own row in FILE_FORMATS.csv.
  • Opus in Ogg (.opus): Has its own row in FILE_FORMATS.csv.
  • Speex in Ogg (.spx): Has its own row in FILE_FORMATS.csv.

Libraries

Libraries Poka uses or has assessed for this format, with the status, licence and language the registry records.

Sources