Android camera2修改相机快门速度
时间: 2023-09-29 08:08:06 浏览: 85
要修改Android camera2相机的快门速度,可以通过设置CaptureRequest.CONTROL_AE_MODE和CaptureRequest.SENSOR_EXPOSURE_TIME参数来实现。
首先,使用CameraManager打开相机并创建CaptureSession。然后,创建一个CaptureRequest.Builder对象,并设置CONTROL_AE_MODE为OFF,这样可以手动控制曝光时间。接着,设置SENSOR_EXPOSURE_TIME参数为所需的快门速度(以纳秒为单位),然后使用CaptureSession.capture()方法发送CaptureRequest请求即可。
以下是一个示例代码片段:
```
// 获取CameraManager实例
CameraManager cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
// 打开相机
CameraCharacteristics characteristics = cameraManager.getCameraCharacteristics(cameraId);
StreamConfigurationMap map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
cameraManager.openCamera(cameraId, new CameraDevice.StateCallback() {
@Override
public void onOpened(@NonNull CameraDevice cameraDevice) {
try {
// 创建CaptureSession
List<Surface> surfaces = new ArrayList<>();
Surface surface = new Surface(textureView.getSurfaceTexture());
surfaces.add(surface);
cameraDevice.createCaptureSession(surfaces, new CameraCaptureSession.StateCallback() {
@Override
public void onConfigured(@NonNull CameraCaptureSession session) {
try {
// 创建CaptureRequest
CaptureRequest.Builder builder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
builder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_OFF);
builder.set(CaptureRequest.SENSOR_EXPOSURE_TIME, exposureTime);
builder.addTarget(surface);
// 发送CaptureRequest请求
session.setRepeatingRequest(builder.build(), null, null);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
@Override
public void onConfigureFailed(@NonNull CameraCaptureSession session) {
// 配置失败
}
}, null);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
@Override
public void onDisconnected(@NonNull CameraDevice cameraDevice) {
// 相机断开连接
}
@Override
public void onError(@NonNull CameraDevice cameraDevice, int error) {
// 相机错误
}
}, null);
```
在上面的代码中,exposureTime变量表示所需的快门速度。注意,快门速度不能超过相机支持的最大值。可以使用CameraCharacteristics.SENSOR_INFO_EXPOSURE_TIME_RANGE获取相机支持的最小和最大快门速度。