Feature: support rotate degree of 180

Live/src/main/java/com/frank/live/camera/Camera2Helper.java

@@ -584,11 +584,15 @@ public class Camera2Helper {
                     offset += len / 4;
                 }
 
-                if (rotateDegree == 90) {
+                if (rotateDegree == 90 || rotateDegree == 180) {
                     if (dstData == null) {
                         dstData = new byte[len * 3 / 2];
                     }
+                    if (rotateDegree == 90) {
                         YUVUtil.YUV420pRotate90(dstData, yuvData, width, height);
+                    } else {
+                        YUVUtil.YUV420pRotate180(dstData, yuvData, width, height);
+                    }
                     if (camera2Listener != null) {
                         camera2Listener.onPreviewFrame(dstData);
                     }

Live/src/main/java/com/frank/live/util/YUVUtil.java

@@ -1,5 +1,7 @@
 package com.frank.live.util;
 
+import android.util.Log;
+
 /**
  * Tool of transforming YUV format
  * Created by frank on 2018/7/1.
@@ -43,25 +45,53 @@ public class YUVUtil {
         return yuv420sp;
     }
 
-  public static void YUV420pRotate90(byte[] dstData, byte[] data, int width, int height) {
+    public static void YUV420pRotate90(byte[] dst, byte[] src, int width, int height) {
         int n = 0;
         int wh = width * height;
-    //y
+        int halfWidth = width / 2;
+        int halfHeight = height / 2;
+        // y
         for (int j = 0; j < width; j++) {
-      for(int i = height - 1; i >= 0; i--) {
+            for (int i = height - 1; i >= 0; i--) {
-        dstData[n++] = data[width * i + j];
+                dst[n++] = src[width * i + j];
+            }
+        }
+        // u
+        for (int i = 0; i < halfWidth; i++) {
+            for (int j = 1; j <= halfHeight; j++) {
+                dst[n++] = src[wh + ((halfHeight - j) * halfWidth + i)];
+            }
+        }
+        // v
+        for (int i = 0; i < halfWidth; i++) {
+            for (int j = 1; j <= halfHeight; j++) {
+                dst[n++] = src[wh + wh / 4 + ((halfHeight - j) * halfWidth + i)];
+            }
+        }
+    }
+
+    public static void YUV420pRotate180(byte[] dst, byte[] src, int width, int height) {
+        int n = 0;
+        int halfWidth = width / 2;
+        int halfHeight = height / 2;
+        // y
+        for (int j = height - 1; j >= 0; j--) {
+            for (int i = width; i > 0; i--) {
+                dst[n++] = src[width * j + i - 1];
             }
         }
-    //u
+        // u
-    for (int i = 0; i < width / 2; i++) {
+        int offset = width * height;
-      for (int j = 1; j <= height / 2; j++) {
+        for (int j = halfHeight - 1; j >= 0; j--) {
-        dstData[n++] = data[wh + ((height/2 - j) * (width / 2) + i)];
+            for (int i = halfWidth; i > 0; i--) {
+                dst[n++] = src[offset + halfWidth * j + i - 1];
             }
         }
-    //v
+        // v
-    for(int i = 0; i < width / 2; i++) {
+        offset += halfWidth * halfHeight;
-      for(int j = 1; j <= height / 2; j++) {
+        for (int j = halfHeight - 1; j >= 0; j--) {
-        dstData[n++] = data[wh + wh / 4 + ((height / 2 - j) * (width / 2) + i)];
+            for (int i = halfWidth; i > 0; i--) {
+                dst[n++] = src[offset + halfWidth * j + i - 1];
             }
         }
     }