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f1f17948c6
The merge pipeline concatenates stored bytes, so features it cannot reproduce faithfully are now detected and rejected with a clear error instead of silently succeeding with a broken output: - EXT-X-GAP (a hole in the merged file) and EXT-X-DISCONTINUITY (a broken timeline) - separate audio renditions referenced by the selected variant: the master EXT-X-MEDIA groups are parsed and an AUDIO group with its own URI fails the resolve; unreferenced groups are ignored - changing init sections: a repeated EXT-X-MAP is compared by all of its attributes (URI and BYTERANGE), not just the URI - encrypted EXT-X-MAP without an explicit IV: the spec does not define a sequence-derived IV for init sections - non-identity AES-128 KEYFORMAT values The supported matrix is documented in the package doc. Add regression tests for every rejection plus real media validation: ffmpeg-generated TS segments and fMP4 init/fragments are committed as fixtures, downloaded through the fetcher (including an AES-128 key rotation variant), and the merged outputs are validated structurally - TS on the 188 byte grid with continuity counter rules, PAT/PMT and PES presence, fMP4 by walking the ISO-BMFF box hierarchy.
25 lines
1.3 KiB
Go
25 lines
1.3 KiB
Go
// Package hls implements native HTTP Live Streaming downloads for m3u8
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// playlists. A task produces exactly one merged, playable output file:
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// MPEG-2 TS segments are concatenated as-is, fMP4 streams are merged as
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// init section followed by the media fragments, and AES-128 encrypted
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// segments are decrypted before they are stored.
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//
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// Supported subset:
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// - VOD media playlists (EXT-X-ENDLIST present) and master playlists whose
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// selected variant carries its own audio
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// - AES-128 with the identity KEYFORMAT, explicit IV or media-sequence
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// derived IV, including key rotation mid-playlist
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// - EXT-X-BYTERANGE (including offset inheritance) and fMP4 init sections
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// via a single, constant EXT-X-MAP
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//
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// Everything the merge pipeline cannot reproduce faithfully is rejected with
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// an explicit error instead of silently producing a broken output file:
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// - live streams (no EXT-X-ENDLIST) and SAMPLE-AES / DRM encryption
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// - EXT-X-GAP (would leave a hole) and EXT-X-DISCONTINUITY (broken timeline)
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// - changing init sections (a repeated EXT-X-MAP is compared by all its
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// attributes, not just the URI) and encrypted EXT-X-MAP without an
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// explicit IV
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// - separate audio renditions referenced by the selected variant (the
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// merged output would have no audio) and non-identity KEYFORMATs
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package hls
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