feat(player): SABR playback (chunk-based, seekable)#47

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Priveetee wants to merge 29 commits into

InfinityLoop1308:devfrom

Priveetee:feat/sabr-client

Commits on Jun 6, 2026

build: replace ExoPlayer 2.18.7 with media3 1.4.1 dependencies
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feat(player): vendor exo_icon_/exo_media_action_ drawables for media3-ui
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feat(player): rewrite the media session glue for media3
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feat(player): convert HttpDataSource subclasses to delegation for media3
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feat(player): swap exoplayer2 imports to media3 across the player stack
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chore(player): bump media3 to 1.10.1 (raises minSdk to 23) and migrate the HLS tracker factory
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feat(player): SABR PO token via headless WebView
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feat(player): SABR session store and format selection
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feat(player): SABR pump and datasource (reader-driven)
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feat(player): wire SABR into the player, resolver and load control
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fix(sabr): cap cached sessions to 2 to stop the cross-video black screen
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feat(sabr): per-segment data source for the chunk-based source (tier2)
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feat(sabr): seekable chunk-based MediaSource core (tier2)
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feat(sabr): wire chunk MediaSource into the resolver (tier2 wip)
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feat(sabr): self-contained webm/mp4 chunks, playback works (tier2)
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fix(sabr): track reader position so playback and seek keep feeding (tier2)
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chore(sabr): drop tier2 debug logging
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feat(sabr): respect the user-selected video quality and force AAC audio
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perf(sabr): persist the PO token on disk and harden the mint timeout/retry
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fix(sabr): ignore ended tracks when reporting the buffered position
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fix(sabr): time segment stalls per-request so a throttled pump can't false-stall
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chore(sabr): remove the dead v1 byte-stream data source
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fix(sabr): adapt LoadControl and ChunkSampleStream to the media3 1.10 APIs
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docs(sabr): clarify the AAC-over-Opus comment, separate the pump false-stall
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fix(sabr): rebuild the session when the user changes video quality/codec
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fix(sabr): keep a 30s back-buffer so short backward seeks land in cache
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fix(sabr): re-fetch evicted segments on a backward seek past the back-buffer
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fix(sabr): fall back to a decodable codec at the chosen resolution, not the highest
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fix(sabr): shrink the back-buffer when the cache is over budget so eviction can drain
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