fix(recording): stop a camera name from matching a different camera - #405
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Included review availability: Your plan provides up to 4 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe PR adds shared deterministic camera-name matching, applies whole-word matching in Electron and the Windows helper, adds unit and Windows integration tests, and documents DirectShow fallback behavior. ChangesCamera matching
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to The change removes unsafe partial-name matching so unrelated cameras are no longer selected and valid fallback devices remain reachable; no actionable merge-blocking risk remains after normal checks and review. Possibly related PRs
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EtienneLescot
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The camera side of this mistake (#405) showed that making the word match whole-word only fixes the instance and leaves the guessing in place, so the tier goes here as well and the two helpers state the same rule. Nothing real needed it. Every microphone on the reporter's machine resolves at 900 or above without it, because Chromium appends USB ids to the name the driver reports and the rest matches outright. What the tier bought was the ability to answer when it should have said "not this one", and saying that is what makes `microphone-defaulted` reachable. The smoke test gains the case that names the class rather than one instance: a request sharing only a BRAND with a present device -- another Logitech thing is still another device -- must resolve to nothing. npm run test:wgc-mic-selection:win 5/5 on real hardware Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Inline comments:
In `@electron/recording/deviceNameMatching.ts`:
- Around line 31-35: Update normalizeDeviceName to preserve Unicode letters and
numbers by replacing non-letter/non-number runs with spaces using Unicode-aware
matching, while retaining lowercasing and trimming. Apply the same normalization
contract in both native helper implementations, and add tests covering exact
matches and mismatches for non-ASCII device names.
In `@scripts/test-windows-camera-selection.mjs`:
- Around line 108-127: Update the negative-case fixtures and assertion loop to
include an expectedCandidate for each case, skip the case with a clear setup
message when that candidate is absent, and otherwise assert it was enumerated
with score 0 before checking expectOpened. Use the existing candidate
enumeration and assertion symbols in the loop around the negative cases.
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electron/ipc/handlers.tselectron/native/wgc-capture/src/webcam_capture.cppelectron/recording/deviceNameMatching.test.tselectron/recording/deviceNameMatching.tspackage.jsonscripts/test-windows-camera-selection.mjstechnical-documentation/architecture/recording.md
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EtienneLescot
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The camera side of this mistake (#405) showed that making the word match whole-word only fixes the instance and leaves the guessing in place, so the tier goes here as well and the two helpers state the same rule. Nothing real needed it. Every microphone on the reporter's machine resolves at 900 or above without it, because Chromium appends USB ids to the name the driver reports and the rest matches outright. What the tier bought was the ability to answer when it should have said "not this one", and saying that is what makes `microphone-defaulted` reachable. The smoke test gains the case that names the class rather than one instance: a request sharing only a BRAND with a present device -- another Logitech thing is still another device -- must resolve to nothing. npm run test:wgc-mic-selection:win 5/5 on real hardware Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Asking for "Logi Capture" opened the Logitech StreamCam. They are two different real devices sharing no word -- but "logi" sits inside "logitech", and the name matcher scored substrings, which was enough to win. Reproduced on the reporter's machine, where both devices exist. The damage is not only the wrong camera. Scoring anything at all means Media Foundation claims the request, so the DirectShow fallback is never reached -- and that fallback is where every camera Media Foundation cannot enumerate lives, NVIDIA Broadcast among them. A near miss did not degrade the answer, it replaced it. So the word-scoring tier goes, rather than being made stricter. Every real pairing resolves without it: the names match once normalized, or one contains the other, which is the ordinary case since Chromium appends USB ids to what the driver reports. Measured on the reporter's hardware, all four cameras and both microphones land at 800 or above. What the tier bought was the ability to answer when it should have said "not this one", and returning zero is what makes the fallback reachable. The rules move to `electron/recording/deviceNameMatching.ts`, where they can be unit-tested at all -- `handlers.ts` calls `app.getPath()` at import and cannot be loaded from a test, which is why its copy never had any. `npm run test:wgc-camera-selection:win` covers the helper's own copy by driving the real binary, since Media Foundation cannot run on Linux CI. Regression-checked on real hardware: OBS Virtual Camera and NVIDIA Broadcast still record through the DirectShow fallback, and the Logitech StreamCam still resolves in Media Foundation at 900. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
…atin names apart
Two more from the review, both real, and the first is the same mistake one
layer down from the tier this branch removed.
Containment scored substrings, and containment is what actually resolves a
camera. A requested "Logi" is spelled inside "Logitech" without being a
word of it, so it resolved the StreamCam -- and resolving anything is what
stops the request reaching the DirectShow fallback, where the cameras
Media Foundation cannot enumerate live. Containment now has to land on
word boundaries, which keeps every real pairing, since Chromium's name is
the driver's plus USB ids and both are whole words.
The other is worse where it applies. `[^a-z0-9]` stripped every non-Latin
letter, so a Japanese "カメラ A" and "ウェブカメラ A" both normalized to "a"
and matched each other at 1000 -- two different cameras, the highest score
there is. `\p{L}\p{N}` keeps them. Only the TypeScript copy had this: both
C++ helpers use `std::iswalnum` on wide characters and were always right.
The smoke test stops passing on evidence it did not have. A helper that
dies, is signalled, or never starts is now a failure rather than a silent
one, and a negative case asserts the cameras were ENUMERATED and all
scored zero -- otherwise it passes merely because nothing was there to
match.
npm run test:wgc-camera-selection:win 5/5 on real hardware
Regression-checked through the fallback again: OBS Virtual Camera 312 KB,
NVIDIA Broadcast 2.2 MB.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
The review asked for the enumerated fixture to be asserted per case, and it was half done: the loop refused a case where NOTHING was enumerated, but not one where the camera it exists to be tempted by was absent while others were present. "Logi Capture must not open the StreamCam" passes on a machine with no StreamCam, having tested nothing. Each negative case now names what tempts it. A case whose temptation is not on offer is skipped with the reason and counted apart, rather than reporting a pass it did not earn. Verified by pointing one case at a camera that is not here: SKIP shares-a-prefix-only — A Camera Not Here was not enumerated here All 4 camera selection cases behaved, 1 skipped for want of the camera they test against. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Asking for "Logi Capture" opened the Logitech StreamCam. Both devices are real and present on the reporter's machine, and they share no word — but
"logi"sits inside"logitech", and the name matcher scored substrings, which was enough to win.Found while adding native coverage for the microphone equivalent in #404, which reached the same place by the same road:
"micro"sits inside the"microphone"that opens nearly every Windows endpoint name.The damage is not only the wrong camera
Scoring anything at all means Media Foundation claims the request — so the DirectShow fallback is never reached. That fallback is where every camera Media Foundation cannot enumerate lives, NVIDIA Broadcast among them. A near miss did not degrade the answer, it replaced it.
Removing the tier rather than tightening it
Making the word match whole-word fixes this instance and leaves the guessing in place. So the tier goes.
Nothing real depends on it. Every pairing on the reporter's hardware resolves without it — the names match once normalized, or one contains the other, which is the ordinary case since Chromium appends USB ids to what the driver reports:
What the tier bought was the ability to answer when it should have said "not this one". Returning zero is what makes the fallback reachable, so it is a real answer rather than a weak match.
Where the rules live now
electron/recording/deviceNameMatching.ts— becausehandlers.tscallsapp.getPath()at import and cannot be loaded from a test, which is why its copy never had one. The helper keeps its own copy in C++;npm run test:wgc-camera-selection:wincovers that by driving the real binary, since Media Foundation cannot run on Linux CI.Verification
Real hardware, after the change:
Regression-checked through the DirectShow fallback too: OBS Virtual Camera records 312 KB and NVIDIA Broadcast 1.29 MB, both unchanged.
1813 tests pass across 155 suites, 0 failures.
tsc,biome,i18n:checkanddocs:checkclean.Note for review order
#404 (microphone) currently makes its own copy of this matcher whole-word. Once this lands, that branch should drop its word tier too, so the three implementations state the same rule. They touch different files, so the two PRs conflict only in the
handlers.tsimport list.🤖 Generated with Claude Code
Summary by CodeRabbit
Bug Fixes
Tests
Documentation