48 lines
1.4 KiB
Objective-C
48 lines
1.4 KiB
Objective-C
//
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// SCExposureState.m
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// Snapchat
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//
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// Created by Derek Peirce on 4/10/17.
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// Copyright © 2017 Snapchat, Inc. All rights reserved.
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//
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#import "SCExposureState.h"
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#import "AVCaptureDevice+ConfigurationLock.h"
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#import <SCBase/SCMacros.h>
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@import AVFoundation;
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@implementation SCExposureState {
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float _ISO;
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CMTime _exposureDuration;
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}
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- (instancetype)initWithDevice:(AVCaptureDevice *)device
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{
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if (self = [super init]) {
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_ISO = device.ISO;
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_exposureDuration = device.exposureDuration;
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}
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return self;
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}
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- (void)applyISOAndExposureDurationToDevice:(AVCaptureDevice *)device
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{
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if ([device isExposureModeSupported:AVCaptureExposureModeCustom]) {
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[device runTask:@"set prior exposure"
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withLockedConfiguration:^() {
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CMTime exposureDuration =
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CMTimeClampToRange(_exposureDuration, CMTimeRangeMake(device.activeFormat.minExposureDuration,
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device.activeFormat.maxExposureDuration));
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[device setExposureModeCustomWithDuration:exposureDuration
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ISO:SC_CLAMP(_ISO, device.activeFormat.minISO,
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device.activeFormat.maxISO)
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completionHandler:nil];
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}];
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}
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}
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@end
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