[f] Support continuousAutoFocus & continuousAutoExposure

LFLiveKit/LFLiveSession.h

@@ -86,6 +86,13 @@ typedef NS_ENUM(NSInteger,LFLiveCaptureTypeMask) {
 /** The torch control capture flash is on or off */
 @property (nonatomic, assign) BOOL torch;
 
+/** The continuousAutoFocus control continuousAutoFocus is on or off */
+@property (nonatomic, assign) BOOL continuousAutoFocus;
+
+/** The continuousAutoExposure control continuousAutoExposure is on or off */
+@property (nonatomic, assign) BOOL continuousAutoExposure;
+
+
 /** The mirror control mirror of front camera is on or off */
 @property (nonatomic, assign) BOOL mirror;
 

LFLiveKit/LFLiveSession.m

@@ -312,6 +312,26 @@ - (BOOL)torch {
     return self.videoCaptureSource.torch;
 }
 
+- (void)setContinuousAutoFocus:(BOOL)continuousAutoFocus {
+  [self willChangeValueForKey:@"continuousAutoFocus"];
+  [self.videoCaptureSource setContinuousAutoFocus:continuousAutoFocus];
+  [self didChangeValueForKey:@"continuousAutoFocus"];
+}
+
+- (BOOL)continuousAutoFocus {
+  return self.videoCaptureSource.continuousAutoFocus;
+}
+
+- (void)setContinuousAutoExposure:(BOOL)continuousAutoExposure {
+  [self willChangeValueForKey:@"continuousAutoExposure"];
+  [self.videoCaptureSource setContinuousAutoExposure:continuousAutoExposure];
+  [self didChangeValueForKey:@"continuousAutoExposure"];
+}
+
+- (BOOL)continuousAutoExposure {
+  return self.videoCaptureSource.continuousAutoExposure;
+}
+
 - (void)setMirror:(BOOL)mirror {
     [self willChangeValueForKey:@"mirror"];
     [self.videoCaptureSource setMirror:mirror];

LFLiveKit/capture/LFVideoCapture.h

@@ -41,6 +41,13 @@
 /** The torch control capture flash is on or off */
 @property (nonatomic, assign) BOOL torch;
 
+/** The continuousAutoFocus control continuousAutoFocus is on or off */
+@property (nonatomic, assign) BOOL continuousAutoFocus;
+
+/** The continuousAutoExposure control continuousAutoExposure is on or off */
+@property (nonatomic, assign) BOOL continuousAutoExposure;
+
+
 /** The mirror control mirror of front camera is on or off */
 @property (nonatomic, assign) BOOL mirror;
 

LFLiveKit/capture/LFVideoCapture.m

@@ -41,6 +41,8 @@ @implementation LFVideoCapture
 @synthesize beautyLevel = _beautyLevel;
 @synthesize brightLevel = _brightLevel;
 @synthesize zoomScale = _zoomScale;
+@synthesize continuousAutoFocus = _continuousAutoFocus;
+@synthesize continuousAutoExposure = _continuousAutoExposure;
 
 #pragma mark -- LifeCycle
 - (instancetype)initWithVideoConfiguration:(LFLiveVideoConfiguration *)configuration {
@@ -158,6 +160,58 @@ - (BOOL)torch {
     return self.videoCamera.inputCamera.torchMode;
 }
 
+- (void)setContinuousAutoFocus:(BOOL)continuousAutoFocus {
+  bool ret = false;
+
+  if (!self.videoCamera.captureSession) return;
+  AVCaptureFocusMode newMode = continuousAutoFocus ? AVCaptureFocusModeContinuousAutoFocus : AVCaptureFocusModeAutoFocus;
+  AVCaptureSession *session = (AVCaptureSession *)self.videoCamera.captureSession;
+  [session beginConfiguration];
+  if (self.videoCamera.inputCamera) {
+    if ([self.videoCamera.inputCamera isFocusModeSupported:newMode]) {
+      NSError *err = nil;
+      if ([self.videoCamera.inputCamera lockForConfiguration:&err]) {
+        self.videoCamera.inputCamera.focusMode = newMode;
+        [self.videoCamera.inputCamera unlockForConfiguration];
+        ret = true;
+      } else {
+        NSLog(@"Error while locking device for auto focus: %@", err);
+        ret = false;
+      }
+    } else {
+      NSLog(@"Auto focus not available in current camera input");
+    }
+  }
+  [session commitConfiguration];
+  _continuousAutoFocus = ret;
+}
+
+- (void)setContinuousAutoExposure:(BOOL)continuousAutoExposure {
+  bool ret = false;
+
+  if (!self.videoCamera.captureSession) return;
+  AVCaptureExposureMode newMode = continuousAutoExposure ? AVCaptureExposureModeContinuousAutoExposure : AVCaptureExposureModeAutoExpose;
+  AVCaptureSession *session = (AVCaptureSession *)self.videoCamera.captureSession;
+  [session beginConfiguration];
+  if (self.videoCamera.inputCamera) {
+    if ([self.videoCamera.inputCamera isExposureModeSupported: newMode]) {
+      NSError *err = nil;
+      if ([self.videoCamera.inputCamera lockForConfiguration:&err]) {
+        self.videoCamera.inputCamera.exposureMode = newMode;
+        [self.videoCamera.inputCamera unlockForConfiguration];
+        ret = true;
+      } else {
+        NSLog(@"Error while locking device for auto exposure: %@", err);
+        ret = false;
+      }
+    } else {
+      NSLog(@"Auto exposure not available in current camera input");
+    }
+  }
+  [session commitConfiguration];
+  continuousAutoExposure = ret;
+}
+
 - (void)setMirror:(BOOL)mirror {
     _mirror = mirror;
 }