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zqxwceandClaude Opus 4.7
ba70b6f523
libcamfix.dylib is loaded into Camera.app (com.apple.camera) by
TweakLoader (the .app/-rule covers Camera.app automatically; the plist
filters to Bundles=[com.apple.camera]). It bridges the vphone shm
frames from libvcamcaptured into Camera.app's normal photo + preview
pipeline so the user can take real photos via the standard shutter.
Hooks (only fire for connections backed by AVCaptureDevice uid
"vphone:vcam:0"):
- _setActiveFormat: substitute device.formats.firstObject when
the session-preset->format lookup hands us a
nil format (would otherwise throw at launch).
- capturePhoto deliver a CMSampleBuffer (built from shm) via
the deprecated didFinishProcessingPhotoSample
delegate path — kept for test harnesses that
use the documented AVCapturePhotoOutput API.
- beginMomentCapture / commitMomentCaptureToPhotoWithUniqueID:
Camera.app's actual shutter path. Skip orig
(would throw), stash the delegate at begin,
drive a synthesized AVCapturePhoto at commit.
- cancelMomentCaptureWithUniqueID: no-op (orig would throw).
- AVCaptureSession _setRunning: / _setInterrupted: setters swallowed
for vcam-bound sessions, and isRunning /
isInterrupted getters force YES / NO so
Camera.app's "preview live" poll keeps the
viewfinder visible past ~4-5 s.
- AVCaptureVideoPreviewLayer: scan UIApplication.windows at 1 Hz
for layers bound to a vcam session and pump
CGImage frames into layer.contents at 30 Hz.
- AVCapturePhoto fileDataRepresentation / CGImageRepresentation:
when the photo we synthesized is the receiver,
return the JPEG / CGImage we built from shm
instead of asking the (non-existent) photo
surface to encode itself.
- CAMStillImageCaptureRequest: dynamically add three stubs
(resolvedSettings, unresolvedSettings,
lensStabilizationSupported) so AVCapturePhoto's
private 27-arg init does not throw on the
CAM-internal request we pass in.
Synthesized AVCapturePhoto construction:
- extract the real CAMStillImageCaptureRequest for the current uid
from CAMCaptureEngine._resultsQueueRegisteredStillImageRequests
(Camera.app's pending-photo dict),
- hand-build a minimal AVCaptureResolvedPhotoSettings via
class_createInstance + ivar writes for uniqueID + dimensions +
empty NSArray ivars (CFRetained so the dealloc chain stays valid),
- feed both into AVCapturePhoto's documented 27-arg
initWithTimestamp:photoSurface:... via NSInvocation,
- tag the photo with the JPEG bytes via objc_setAssociatedObject
so the fileDataRepresentation hook returns them.
Full AVF + CAM internal delegate sequence fired at commit time:
willBeginCaptureBeforeResolvingSettingsForUniqueID,
willBeginCaptureForResolvedSettings, willCapturePhotoForResolvedSettings,
didCapturePhotoForResolvedSettings, didFinishProcessingPhoto:error:,
didFinishCaptureForResolvedSettings:error:,
_didFinishStillImageCaptureForUniqueID:error:, and crucially
captureOutput:readyForResponsiveRequestAfterResolvedSettings:.
Without that last "responsive ready" signal AVF's 2-deep pipeline
never frees its slots and Camera.app's shutter stops accepting
input after the 2nd capture.
Install wiring in scripts/cfw_install_exp.sh:
- build_libcamfix() — clang -arch arm64e -fobjc-arc -Os, frameworks
AVFoundation / CoreImage / CoreMedia / CoreVideo / Foundation /
ImageIO / IOSurface / MobileCoreServices / Photos / QuartzCore /
UIKit, ldid-signed.
- [JB-4.2] scp the dylib + plist into procursus/Library/MobileSubstrate/
DynamicLibraries (same location as libvcamcaptured) and chmod /
chown so TweakLoader picks them up on next boot.
End state: Camera.app on EXP shows live preview from the host-supplied
vcam frames, the shutter takes real photos that get saved into Photos
via Camera.app's own pipeline (no PHPhotoLibrary back-channel), and
the shutter button keeps working across many consecutive captures.
Co-Authored-By: Claude Opus 4.7 <[email protected]>