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fix(sw): stop repositioning a forward-only source on the software path - #15
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A forward-only source (one chunked response with no ranges, a sequential origin, a one-shot custom reader) has one read position. Three paths tried to move it, and each ended the session: the reposition flushes the packets the demuxer has queued, the reader cannot rewind to read them again, libavformat reports "partial file", and the read loop stops. - load with a start position: the software host no longer seeks. A start inside the clock anchor's 2 s tolerance is reached by decoding forward from the stream origin; a later one is dropped and playback begins at the origin. A host resuming a server-seeked progressive stream hit the seek on every resume, because the server starts the stream at the preceding keyframe and asks the player to skip the pre-roll. - seek: rejected at the engine with the new SeekEvent.Rejection.sourceNotSeekable, before the target is clamped to the container's duration or published. The host refuses too, before any decoder or queue is disturbed. - play: no rewind to zero. A fragmented MP4 served as one response reports its first fragment as the duration, so the playhead read as parked at the end and the first play after a pause ended playback. Seekable and live sources are unchanged. The audio-only host still repositions a forward-only source. Refs Silo-Server/silo-apple#656 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Included review availability: This review used your included allowance. Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe software video path now plans start positions for forward-only sources. It rejects unsupported seeks and avoids rewinding those sources before playback. Seekable and live source handling remains unchanged. ChangesForward-only playback
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Merge Risk: 🔵 Low · up to A rejected seek may briefly display the wrong position, but playback continues and the display corrects itself. This does not block merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Full details: Docstring CoverageExplanation Docstring coverage is 31.25% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 16 functions across 5 files. (1 skipped: 1 unsupported.)
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Inline comments:
Review comments at @Sources/AetherEngine/AetherEngine.swift:
- Around line 5059-5064: Update the forward-only refusal guard in the seek flow
to close an in-flight deferred ticket with a rejected result when replay is
refused. Preserve the standalone emitSeekRejected behavior when no deferred
ticket is active.
Review comments at @Sources/AetherEngine/SeekEvent.swift:
- Line 46: Update the release notes for the public `SeekEvent.Rejection`
addition to identify `sourceNotSeekable` as a source-breaking change for
exhaustive switches and document that clients must handle the new case; follow
the existing `.ended` note for `PlaybackState` in `CHANGELOG.md`.
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CHANGELOG.mdSources/AetherEngine/AetherEngine.swiftSources/AetherEngine/Native/SoftwarePlaybackHost.swiftSources/AetherEngine/SeekEvent.swiftTests/AetherEngineTests/SeekToEndOfMediaTests.swiftTests/AetherEngineTests/SoftwareHostForwardOnlyStartTests.swift
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… its replay A seek stashed during load is replayed once the session settles, with its deferred ticket still open. The forward-only rejection returned without closing it, so isSeeking stayed latched over a session that played on. Close the ticket with the rejection; a seek with no stash still gets the standalone event. Also say in the changelog that SeekEvent.Rejection.sourceNotSeekable is a new public case an exhaustive switch has to handle. Refs Silo-Server/silo-apple#656 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Summary
A forward-only source (one chunked response with no ranges) ends its session whenever the software path tries to reposition it: on load with a start position, on a seek, and on the first play after a pause. This stops all three. Silo's Apple client hits it on every resumed or paused "Server Remux" title.
Related issue: Silo-Server/silo-apple#656 (issues are disabled on this repository; that issue has the logs and the trace).
What changed
SoftwarePlaybackHost.loadno longer seeks a forward-only source. A start inside the clock anchor's 2 s tolerance is reached by decoding forward from the stream origin; a later one is dropped and playback begins at the origin. The limit isSWClockAnchorPolicy.toleranceSecondsbecause past it the clock re-anchors at the first audio sample, which without a reposition is the origin: pre-roll audio with no picture.AetherEngine.seek(to:)rejects a seek on such a source with a newSeekEvent.Rejection.sourceNotSeekable, before the target is clamped to the container's duration or published.SoftwarePlaybackHost.seek(to:)refuses as well, before any decoder or queue is disturbed. A seek stashed during load and refused on replay has its deferred ticket closed with the rejection, soisSeekingdoes not stay latched.shouldRewindBeforePlaynever rewinds a source that cannot be repositioned. A fragmented MP4 served as one response reports its first fragment as the duration (3.5 s for a feature film), so the playhead reads as parked at the end for the rest of the session.Why the reposition is fatal:
avformat_seek_fileandavformat_flushdiscard the packets the probe queued, the reader cannot rewind to read them again, libavformat logspartial file, and the read loop stops.Not covered:
AudioPlaybackHoststill repositions a forward-only source on load and seek, andplay()can still rewind when it owns the transport.positionUnderReconstruction, the subtitle start anchor) keeps the requested value while playback is at the origin.Test plan
Content-Lengthand no range support (server-side remux), HEVC Main10 3840x1608 HDR10, E-AC-3 5.1, 23.976 fps.aed4dde1), three loads of the same title:start at 0.49s reached by decoding from the stream origin, first frame at pts 0.501 s, clock anchored at 0.495 s, playing. Onmainthe same load logspartial fileanddemux read failedand never shows a frame.mainthis logsseek#1 programmatic began target=0.00, thenpartial file.swift test --skip "$AUTHORIZATION_TEST_SUITES": 3396 tests passed.swift test --skip-build --filter "$AUTHORIZATION_TEST_SUITES": 56 passed.Checklist
CHANGELOG.mdupdatedfeat(...),fix(...),chore(...))Public API: one new case,
SeekEvent.Rejection.sourceNotSeekable. A host that switches exhaustively overRejectionneeds a new arm.AI Disclosure
AudioPlaybackHostis untouched; and that the tests cover only the pure decisions. The limit is now the anchor tolerance and the seek is rejected at the engine; the audio host and the test coverage are listed above as not covered. The repository's review bots (silo-kody and CodeRabbit) then reported that the rejection left a stashed seek's ticket open; the second commit closes it. That path has no test.🤖 Generated with Claude Code
Note
Stop repositioning forward-only software sources on play and seek
SoftwarePlaybackHost.loaduses a newStartPlanpolicy: starts within the clock-anchor tolerance (SWClockAnchorPolicy.toleranceSeconds) decode forward from the origin, farther starts drop to origin playback, and seekable/live sources keep the existing reposition path in SoftwarePlaybackHost.swiftAetherEngine.playno longer requests an end-of-media rewind for non-repositionable sources, via the newsourceCanRepositionguard in AetherEngine.swiftSeekEvent.Rejection.sourceNotSeekablecase in SeekEvent.swift; playback continues at its current position without disturbing demuxer or decoder state.stalledbefore any seek work, and far requested starts begin at the stream origin instead of the requested positionMacroscope summarized aed4dde.