如果当前亮度值低于25，调整曝光时间和ISO后重新拍一张作为对比

app/src/main/cpp/PhoneDevice.cpp

@@ -1241,6 +1241,41 @@ bool CPhoneDevice::OnImageReady(cv::Mat& mat)
     cv::Scalar scalarRed(0, 0, 255);  // red
 
     NdkCamera::CAPTURE_RESULT captureResult = mCamera->getCaptureResult();
+
+    if (captureResult.avgY < 25 && mPhotoInfo.autoExposure != 0)
+    {
+        // Take another photo
+        CPhoneDevice* pThis = this;
+        std::string path = mPath;
+        IDevice::PHOTO_INFO photoInfo = mPhotoInfo;
+        std::vector<IDevice::OSD_INFO> osds = mOsds;
+
+        photoInfo.photoId += 1;
+        photoInfo.autoExposure = 0;
+        if (captureResult.avgY == 0)
+        {
+            photoInfo.exposureTime = 400;
+            photoInfo.sensitivity = 2000;
+        }
+        else
+        {
+            photoInfo.exposureTime = captureResult.exposureTime / 100000 * 120 / captureResult.avgY;
+            photoInfo.sensitivity = photoInfo.sensitivity * 60 / captureResult.avgY;
+            if (photoInfo.sensitivity > 2000)
+            {
+                photoInfo.sensitivity = 2000;
+            }
+        }
+
+        std::thread t([=]
+            {
+                std::this_thread::sleep_for(std::chrono::milliseconds(5000));
+                pThis->TakePhoto(photoInfo, osds, path);
+            });
+
+        t.detach();
+    }
+
     char extimeunit[4] = { 0 };
     unsigned int extime = (captureResult.exposureTime >= 1000000) ? ((unsigned int)(captureResult.exposureTime / 1000000)) : ((unsigned int)(captureResult.exposureTime / 1000));
     strcpy(extimeunit, (captureResult.exposureTime >= 1000000) ? "ms" : "ns");

app/src/main/cpp/camera2/ndkcamera.cpp

@@ -847,20 +847,17 @@ void NdkCamera::onImageAvailable(AImageReader* reader)
     // int y_len = 0;
     int u_len = 0;
     int v_len = 0;
-    if (y_data == 0)
-    {
     AImage_getPlaneData(image, 0, &y_data, &y_len);
-    }
     AImage_getPlaneData(image, 1, &u_data, &u_len);
     AImage_getPlaneData(image, 2, &v_data, &v_len);
 
-#if 0
+#if 1
 #if __cplusplus >= 201703L
-    uint64_t avgy = std::reduce(y_data, y_data + y_len, 0);
+    uint64_t avgY = std::reduce(y_data, y_data + y_len, 0);
 #else
-    uint64_t avgy = std::accumulate(y_data, y_data + y_len, 0);
+    uint64_t avgY = std::accumulate(y_data, y_data + y_len, 0);
 #endif
-    mResult.avgY = avgy / y_len;
+    mResult.avgY = avgY / y_len;
 #endif
 
     if (u_data == v_data + 1 && v_data == y_data + width * height && y_pixelStride == 1 && u_pixelStride == 2 && v_pixelStride == 2 && y_rowStride == width && u_rowStride == width && v_rowStride == width)