93 lines
2.3 KiB
Objective-C
93 lines
2.3 KiB
Objective-C
//
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// SCBlackCameraPreviewDetector.m
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// Snapchat
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//
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// Created by Derek Wang on 25/01/2018.
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//
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#import "SCBlackCameraPreviewDetector.h"
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#import "SCBlackCameraReporter.h"
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#import "SCMetalUtils.h"
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#import <SCCrashLogger/SCCrashLogger.h>
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#import <SCFoundation/SCQueuePerformer.h>
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#import <SCFoundation/SCThreadHelpers.h>
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#import <SCFoundation/SCZeroDependencyExperiments.h>
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// Check whether preview is visible when AVCaptureSession is running
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static CGFloat const kSCBlackCameraCheckingDelay = 0.5;
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@interface SCBlackCameraPreviewDetector () {
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BOOL _previewVisible;
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dispatch_block_t _checkingBlock;
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}
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@property (nonatomic) SCQueuePerformer *queuePerformer;
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@property (nonatomic) SCBlackCameraReporter *reporter;
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@end
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@implementation SCBlackCameraPreviewDetector
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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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- (void)capturePreviewDidBecomeVisible:(BOOL)visible
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{
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[_queuePerformer perform:^{
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_previewVisible = visible;
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}];
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}
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- (void)sessionDidChangeIsRunning:(BOOL)running
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{
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if (running) {
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[self _scheduleCheck];
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} else {
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[_queuePerformer perform:^{
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if (_checkingBlock) {
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dispatch_block_cancel(_checkingBlock);
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_checkingBlock = nil;
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}
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}];
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}
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}
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- (void)_scheduleCheck
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{
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[_queuePerformer perform:^{
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@weakify(self);
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_checkingBlock = dispatch_block_create(0, ^{
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@strongify(self);
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SC_GUARD_ELSE_RETURN(self);
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self->_checkingBlock = nil;
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[self _checkPreviewState];
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});
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[_queuePerformer perform:_checkingBlock after:kSCBlackCameraCheckingDelay];
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}];
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}
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- (void)_checkPreviewState
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{
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if (!_previewVisible) {
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runOnMainThreadAsynchronously(^{
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// Make sure the app is in foreground
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SC_GUARD_ELSE_RETURN([UIApplication sharedApplication].applicationState == UIApplicationStateActive);
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SCBlackCameraCause cause =
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SCDeviceSupportsMetal() ? SCBlackCameraRenderingPaused : SCBlackCameraPreviewIsHidden;
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[_reporter reportBlackCameraWithCause:cause];
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[_reporter fileShakeTicketWithCause:cause];
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});
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}
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}
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@end
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