修复crash

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

@@ -713,11 +713,12 @@ bool NdkCamera::on_image(cv::Mat& rgb)
 
 void NdkCamera::on_image(const unsigned char* nv21, int nv21_width, int nv21_height)
 {
-    ALOGW("nv21 size: %d x %d", nv21_width, nv21_height);
+    // ALOGW("nv21 size: %d x %d", nv21_width, nv21_height);
     // rotate nv21
     int w = 0;
     int h = 0;
     int rotate_type = 0;
+    cv::Mat nv21_rotated;
     const unsigned char* yuv420data = nv21;
     // TODO !!!???
     // int co = camera_orientation > 0 ? camera_orientation + 90 : camera_orientation;
@@ -739,26 +740,26 @@ void NdkCamera::on_image(const unsigned char* nv21, int nv21_width, int nv21_hei
             h = nv21_height;
             rotate_type = camera_facing == 0 ? 2 : 1;
         }
-        if (co == 90)
+        else if (co == 90)
         {
             w = nv21_height;
             h = nv21_width;
             rotate_type = camera_facing == 0 ? 5 : 6;
         }
-        if (co == 180)
+        else if (co == 180)
         {
             w = nv21_width;
             h = nv21_height;
             rotate_type = camera_facing == 0 ? 4 : 3;
         }
-        if (co == 270)
+        else if (co == 270)
         {
             w = nv21_height;
             h = nv21_width;
             rotate_type = camera_facing == 0 ? 7 : 8;
         }
 
-        cv::Mat nv21_rotated(h + h / 2, w, CV_8UC1);
+        nv21_rotated.create(h + h / 2, w, CV_8UC1);
         ncnn::kanna_rotate_yuv420sp(nv21, nv21_width, nv21_height, nv21_rotated.data, w, h, rotate_type);
         yuv420data = nv21_rotated.data;
     }