85 lines
1.9 KiB
Objective-C
85 lines
1.9 KiB
Objective-C
//
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// SCBlackCameraRunningDetector.m
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// Snapchat
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//
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// Created by Derek Wang on 30/01/2018.
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//
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#import "SCBlackCameraRunningDetector.h"
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#import "SCBlackCameraReporter.h"
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#import <SCFoundation/SCAssertWrapper.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 isRunning within this period
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static CGFloat const kSCBlackCameraCheckingDelay = 5;
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@interface SCBlackCameraRunningDetector () {
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BOOL _isSessionRunning;
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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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@end
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@implementation SCBlackCameraRunningDetector
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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)sessionDidChangeIsRunning:(BOOL)running
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{
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[_queuePerformer perform:^{
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_isSessionRunning = running;
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}];
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}
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- (void)sessionDidCallStartRunning
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{
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[self _scheduleCheck];
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}
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- (void)sessionWillCallStopRunning
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{
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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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- (void)_scheduleCheck
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{
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[_queuePerformer perform:^{
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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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[_queuePerformer perform:_checkSessionBlock after:kSCBlackCameraCheckingDelay];
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}];
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}
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- (void)_checkSessionState
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{
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if (!_isSessionRunning) {
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[_reporter reportBlackCameraWithCause:SCBlackCameraSessionNotRunning];
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}
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}
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@end
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