Camera2前置摄像头预览旋转
Camera2前置摄像头预览旋转
提问于 2015-12-10 21:37:04
我正在camera2上工作，并且遇到了旋转的问题。在某些设备中，当切换到前置摄像头时，预览会旋转180度。我正在为camera2寻找这样的"setDefaultOrientation()“方法，但找不到。
谢谢
回答 3
Stack Overflow用户
回答已采纳
发布于 2015-12-20 17:42:25
对于GLSurfaceView，您可能会使用SurfaceTexture将摄影机预览流映射到GL纹理，然后对其进行渲染。
纹理中的图像数据不会自动旋转为“直立”--首先，操作系统无法知道您将如何渲染纹理。
但是，SurfaceTexture有一个getTransformMatrix调用，当连接到camera2应用编程接口时，它将为您提供从相机方向到设备本机方向的必要转换(通常是手机的纵向，平板电脑的横向，但并不总是如此)。然后，您必须将从原生方向到应用程序方向的转换添加到此矩阵中，然后应用组合矩阵转换来调整预览图像。
Stack Overflow用户
发布于 2015-12-14 21:57:36
使用CameraCharacterisitics在CameraCaptureSession.StateCallback中捕获图像时，可以在CaptureRequest对象中设置正确的图像旋转
CameraCharacterisitics cameraCharacteristics = cameraManager.getCameraCharacteristics(cameraId);就像这样。
private CameraCaptureSession.StateCallback sessionStateCallback = new CameraCaptureSession.StateCallback() {
@Override
public void onConfigured(@NonNull CameraCaptureSession session) {
captureSession = session;
try {
CaptureRequest.Builder builder = session.getDevice().createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
builder.addTarget(imageReader.getSurface());
builder.set(CaptureRequest.JPEG_ORIENTATION, cameraCharacteristics.get(CameraCharacteristics.SENSOR_ORIENTATION));
session.capture(builder.build(), null, backgroundHandler);
} catch (CameraAccessException e) {
Log.d("tag", e.getMessage());
}
}
@Override
public void onConfigureFailed(@NonNull CameraCaptureSession session) {
}
};Stack Overflow用户
发布于 2015-12-10 21:56:31
你可以试试这个代码来打开你的相机
我希望这能有所帮助。
public void startPreview() {
try {
Log.i(TAG, "starting preview: " + started);
// ....
Camera.CameraInfo camInfo = new Camera.CameraInfo();
Camera.getCameraInfo(cameraIndex, camInfo);
int cameraRotationOffset = camInfo.orientation;
// ...
Camera.Parameters parameters = camera.getParameters();
List<Camera.Size> previewSizes = parameters.getSupportedPreviewSizes();
Camera.Size previewSize = null;
float closestRatio = Float.MAX_VALUE;
int targetPreviewWidth = isLandscape() ? getWidth() : getHeight();
int targetPreviewHeight = isLandscape() ? getHeight() : getWidth();
float targetRatio = targetPreviewWidth / (float) targetPreviewHeight;
Log.v(TAG, "target size: " + targetPreviewWidth + " / " + targetPreviewHeight + " ratio:" + targetRatio);
for (Camera.Size candidateSize : previewSizes) {
float whRatio = candidateSize.width / (float) candidateSize.height;
if (previewSize == null || Math.abs(targetRatio - whRatio) < Math.abs(targetRatio - closestRatio)) {
closestRatio = whRatio;
previewSize = candidateSize;
}
}
int rotation = getWindowManager().getDefaultDisplay().getRotation();
int degrees = 0;
switch (rotation) {
case Surface.ROTATION_0:
degrees = 0;
break; // Natural orientation
case Surface.ROTATION_90:
degrees = 90;
break; // Landscape left
case Surface.ROTATION_180:
degrees = 180;
break;// Upside down
case Surface.ROTATION_270:
degrees = 270;
break;// Landscape right
}
int displayRotation;
if (isFrontFacingCam) {
displayRotation = (cameraRotationOffset + degrees) % 360;
displayRotation = (360 - displayRotation) % 360; // compensate
// the
// mirror
} else { // back-facing
displayRotation = (cameraRotationOffset - degrees + 360) % 360;
}
Log.v(TAG, "rotation cam / phone = displayRotation: " + cameraRotationOffset + " / " + degrees + " = "
+ displayRotation);
this.camera.setDisplayOrientation(displayRotation);
int rotate;
if (isFrontFacingCam) {
rotate = (360 + cameraRotationOffset + degrees) % 360;
} else {
rotate = (360 + cameraRotationOffset - degrees) % 360;
}
Log.v(TAG, "screenshot rotation: " + cameraRotationOffset + " / " + degrees + " = " + rotate);
Log.v(TAG, "preview size: " + previewSize.width + " / " + previewSize.height);
parameters.setPreviewSize(previewSize.width, previewSize.height);
parameters.setRotation(rotate);
camera.setParameters(parameters);
camera.setPreviewDisplay(mHolder);
camera.startPreview();
Log.d(TAG, "preview started");
started = true;
} catch (IOException e) {
Log.d(TAG, "Error setting camera preview: " + e.getMessage());
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/34203340
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