如何切换摄像头录制会话AVfoundation？

Question

我有一个录音会话，但是当我更换相机时，这只保存第一个摄像头的第一个视频，然后开关不保存，我该怎么做？

我使用此功能切换和加载新相机：

 - (IBAction)switchCameras:(id)sender

AVCaptureDevicePosition desiredPosition;
if (isUsingFrontFacingCamera)
    desiredPosition = AVCaptureDevicePositionBack;
else
    desiredPosition = AVCaptureDevicePositionFront;

for (AVCaptureDevice *d in [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo]) {
    if ([d position] == desiredPosition) {
        [[previewLayer session] beginConfiguration];
        AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:d error:nil];
        for (AVCaptureInput *oldInput in [[previewLayer session] inputs]) {
            [[previewLayer session] removeInput:oldInput];
        }
        [[previewLayer session] addInput:input];
        [[previewLayer session] commitConfiguration];
        break;
    }
}
isUsingFrontFacingCamera = !isUsingFrontFacingCamera;
 }

谢谢！

Answer 1

删除旧的AVCaptureDeviceInput并添加新的AVCaptureDeviceInput后，您可能需要重新创建AVCaptureConnection，调整从新捕获输入到捕获输出的流量。