137 lines
3.8 KiB
Objective-C
137 lines
3.8 KiB
Objective-C
//
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// SCBlackCameraDetectorCameraView.m
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// Snapchat
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//
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// Created by Derek Wang on 24/01/2018.
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//
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#import "SCBlackCameraViewDetector.h"
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#import "SCBlackCameraReporter.h"
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#import "SCCaptureDeviceAuthorization.h"
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#import <SCFoundation/SCAssertWrapper.h>
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#import <SCFoundation/SCLog.h>
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#import <SCFoundation/SCQueuePerformer.h>
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#import <SCFoundation/SCTraceODPCompatible.h>
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#import <SCLogger/SCCameraMetrics.h>
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// Check whether we called [AVCaptureSession startRunning] within this period
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static CGFloat const kSCBlackCameraCheckingDelay = 0.5;
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@interface SCBlackCameraViewDetector () {
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BOOL _startRunningCalled;
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BOOL _sessionIsRecreating;
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dispatch_block_t _checkSessionBlock;
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}
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@property (nonatomic) SCQueuePerformer *queuePerformer;
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@property (nonatomic) SCBlackCameraReporter *reporter;
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@property (nonatomic, weak) UIGestureRecognizer *cameraViewGesture;
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@end
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@implementation SCBlackCameraViewDetector
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- (instancetype)initWithPerformer:(SCQueuePerformer *)performer reporter:(SCBlackCameraReporter *)reporter
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{
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self = [super init];
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if (self) {
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_queuePerformer = performer;
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_reporter = reporter;
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}
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return self;
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}
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#pragma mark - Camera view visibility change trigger
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- (void)onCameraViewVisible:(BOOL)visible
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{
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SCTraceODPCompatibleStart(2);
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SCLogCoreCameraInfo(@"[BlackCamera] onCameraViewVisible: %d", visible);
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BOOL firstTimeAccess = [SCCaptureDeviceAuthorization notDeterminedForVideoCapture];
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if (firstTimeAccess) {
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// We don't want to check black camera for firstTimeAccess
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return;
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}
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// Visible and application is active
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if (visible && [UIApplication sharedApplication].applicationState == UIApplicationStateActive) {
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// Since this method is usually called before the view is actually visible, leave some margin to check
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[self _scheduleCheckDelayed:YES];
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} else {
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[_queuePerformer perform:^{
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if (_checkSessionBlock) {
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dispatch_block_cancel(_checkSessionBlock);
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_checkSessionBlock = nil;
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}
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}];
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}
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}
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// Call this when [AVCaptureSession startRunning] is called
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- (void)sessionWillCallStartRunning
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{
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[_queuePerformer perform:^{
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_startRunningCalled = YES;
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}];
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}
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- (void)sessionWillCallStopRunning
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{
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[_queuePerformer perform:^{
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_startRunningCalled = NO;
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}];
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}
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- (void)_scheduleCheckDelayed:(BOOL)delay
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{
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[_queuePerformer perform:^{
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SC_GUARD_ELSE_RETURN(!_checkSessionBlock);
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@weakify(self);
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_checkSessionBlock = dispatch_block_create(0, ^{
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@strongify(self);
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SC_GUARD_ELSE_RETURN(self);
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self->_checkSessionBlock = nil;
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[self _checkSessionState];
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});
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if (delay) {
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[_queuePerformer perform:_checkSessionBlock after:kSCBlackCameraCheckingDelay];
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} else {
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[_queuePerformer perform:_checkSessionBlock];
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}
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}];
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}
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- (void)_checkSessionState
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{
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SCLogCoreCameraInfo(@"[BlackCamera] checkSessionState startRunning: %d, sessionIsRecreating: %d",
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_startRunningCalled, _sessionIsRecreating);
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if (!_startRunningCalled && !_sessionIsRecreating) {
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[_reporter reportBlackCameraWithCause:SCBlackCameraStartRunningNotCalled];
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[_reporter fileShakeTicketWithCause:SCBlackCameraStartRunningNotCalled];
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}
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}
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- (void)sessionWillRecreate
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{
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[_queuePerformer perform:^{
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_sessionIsRecreating = YES;
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}];
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}
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- (void)sessionDidRecreate
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{
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[_queuePerformer perform:^{
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_sessionIsRecreating = NO;
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}];
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}
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- (void)onCameraViewVisibleWithTouch:(UIGestureRecognizer *)gesture
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{
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if (gesture != _cameraViewGesture) {
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// Skip repeating gesture
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self.cameraViewGesture = gesture;
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[self _scheduleCheckDelayed:NO];
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}
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}
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@end
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