72 lines
2.7 KiB
Plaintext
72 lines
2.7 KiB
Plaintext
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#import <AVFoundation/AVFoundation.h>
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#import <UIKit/UIKit.h>
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/// 获取当前正在使用的后置摄像头设备
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static AVCaptureDevice *GetActiveRearCamera(void)
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{
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// 遍历所有正在运行的 AVCaptureSession，找到后置摄像头的输入
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if (@available(iOS 10.0, *)) {
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AVCaptureDeviceDiscoverySession *session = [AVCaptureDeviceDiscoverySession
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discoverySessionWithDeviceTypes:@[AVCaptureDeviceTypeBuiltInWideAngleCamera]
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mediaType:AVMediaTypeVideo
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position:AVCaptureDevicePositionBack];
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for (AVCaptureDevice *d in session.devices) {
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if (d.deviceType == AVCaptureDeviceTypeBuiltInWideAngleCamera) {
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return d;
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}
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}
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}
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return [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
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}
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extern "C" {
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/// 开启连续自动对焦
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void _EnableContinuousAutoFocus(void)
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{
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AVCaptureDevice *device = GetActiveRearCamera();
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if (!device) return;
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NSError *error = nil;
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if ([device lockForConfiguration:&error]) {
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if ([device isFocusModeSupported:AVCaptureFocusModeContinuousAutoFocus]) {
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device.focusMode = AVCaptureFocusModeContinuousAutoFocus;
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NSLog(@"[CameraFocusHelper] 已开启连续自动对焦");
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}
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if ([device isExposureModeSupported:AVCaptureExposureModeContinuousAutoExposure]) {
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device.exposureMode = AVCaptureExposureModeContinuousAutoExposure;
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}
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[device unlockForConfiguration];
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} else {
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NSLog(@"[CameraFocusHelper] 配置失败: %@", error.localizedDescription);
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}
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}
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/// 触发单次自动对焦（点击对焦用）
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void _TriggerAutoFocus(float normalizedX, float normalizedY)
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{
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AVCaptureDevice *device = GetActiveRearCamera();
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if (!device) return;
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NSError *error = nil;
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if ([device lockForConfiguration:&error]) {
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if ([device isFocusPointOfInterestSupported]) {
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device.focusPointOfInterest = CGPointMake(normalizedX, normalizedY);
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device.focusMode = AVCaptureFocusModeAutoFocus;
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}
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if ([device isExposurePointOfInterestSupported]) {
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device.exposurePointOfInterest = CGPointMake(normalizedX, normalizedY);
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device.exposureMode = AVCaptureExposureModeAutoExpose;
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}
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[device unlockForConfiguration];
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// 1.5秒后恢复连续对焦
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dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.5 * NSEC_PER_SEC)),
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dispatch_get_main_queue(), ^{
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_EnableContinuousAutoFocus();
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});
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}
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}
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}
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