Dominik Schmidt created TIKA-4801:
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Summary: Extract cover art from audio files
Key: TIKA-4801
URL: https://issues.apache.org/jira/browse/TIKA-4801
Project: Tika
Issue Type: New Feature
Reporter: Dominik Schmidt
Audio containers commonly embed cover art, but Tika drops it everywhere:
Mp3Parser ignores ID3v2 APIC frames, TikaUserDataBox explicitly skips the
MP4/M4A 'covr' atom ("skip this for now"), and the Ogg family parsers do not
handle METADATA_BLOCK_PICTURE respectively the FLAC PICTURE block.
Proposal: emit the pictures through the standard EmbeddedDocumentExtractor
mechanism, the same way PDF and Office parsers emit embedded images. No new
metadata properties are needed: with the RecursiveParserWrapper (/rmeta) each
cover shows up as its own metadata entry with content type and real dimensions
from the image parser, uniformly for all four formats, and /unpack delivers the
bytes. That is deliberately preferred over mapping the width/height fields that
FLAC and Vorbis picture blocks declare, since ID3 and MP4 declare no dimensions
at all and the declared values are unreliable anyway.
Where available, the declared picture type (front cover, back cover, ...) and
description can be set on the embedded document's metadata.
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