将YUV420P像素数据的周围加上边框

README.md

@@ -102,6 +102,24 @@ yuv420_split.cpp 程序中的函数可以将YUV420P数据中的Y、U、V三个
 
 
 
+## 将YUV420P像素数据的周围加上边框
+> 说明：本程序将距离图像边缘border范围内的像素的Y分量、U分量、Y分量的取值设置成了最大值255。
+
+调用方法：
+> ./yuv420p_border ./mediadata/lena_256x256_yuv420p.yuv 256 256 30
+
+上述代码运行后，将会把一张分辨率为256x256的名称为lena_256x256_yuv420p.yuv的YUV420P格式的像素数据文件处理成名称为output_420p_border.yuv的YUV420P格式的像素数据文件。输入的原图如下所示。
+
+![](./images/yuv420p.png)   ![](./images/yuv420p_border.png)
+
+
+
+
+
+<br />
+<br />
+
+
 
 参考：[视音频数据处理入门：RGB、YUV像素数据处理](http://blog.csdn.net/leixiaohua1020/article/details/50534150)
 ![](./images/leixiaohua_avDataProcess.png)

yuv420p_border.cpp

@@ -0,0 +1,120 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef int BOOL;
+#define TRUE  1
+#define FALSE 0
+
+//分离YUV420P像素数据中的Y、U、V分量
+BOOL yuv420p_border(const char *file, int width, int height, int border)
+{
+    if (file == NULL) {
+        return FALSE;
+    }
+    FILE *fp  = fopen(file, "rb+");   
+    FILE *fp0 = fopen("./out/output_420p_border.yuv", "wb+");
+    
+    unsigned char *data = (unsigned char *)malloc(width*height*3/2);
+    memset(data, 0, width*height*3/2);
+    
+    fread(data, 1, width*height*3/2, fp);
+    
+    //给Y分量添加边框
+    for(int i=0; i<height; i++) {
+        for(int j=0; j<width; j++) {
+            //添加左右边框
+            if (j < border) {
+                data[i*width + j] = 255;
+                continue;
+            }
+            if (j >= width-border) {
+                data[i*width + j] = 255;
+                continue;
+            }
+            
+            //添加上下边框
+            if (i < border) {
+                data[i*width + j] = 255;
+                continue;
+            }
+            if (i >= width-border) {
+                data[i*width + j] = 255;
+                continue;
+            }
+        }
+    }
+
+    int tmpBorder = border/2;
+    int tmpW = width/2;
+    int tmpH = height/2;
+    
+    //给U分量添加边框
+    int uDataStart = width*height;
+    for(int i=0; i<tmpH; i++) {
+        for(int j=0; j<tmpW; j++) {
+            //添加左右边框
+            if (j < tmpBorder) {
+                data[uDataStart + i*tmpW + j] = 255;
+                continue;
+            }
+            if (j >= tmpW-tmpBorder) {
+                data[uDataStart + i*tmpW + j] = 255;
+                continue;
+            }
+            
+            //添加上下边框
+            if (i < tmpBorder) {
+                data[uDataStart + i*tmpW + j] = 255;
+                continue;
+            }
+            if (i >= tmpW-tmpBorder) {
+                data[uDataStart + i*tmpW + j] = 255;
+                continue;
+            }
+        }    
+    }
+    
+    //给V分量添加边框
+    int vDataStart = width*height*5/4;
+    for(int i=0; i<tmpH; i++) {
+        for(int j=0; j<tmpW; j++) {
+            //添加左右边框
+            if (j < tmpBorder) {
+                data[vDataStart + i*tmpW + j] = 255;
+                continue;
+            }
+            if (j >= tmpW-tmpBorder) {
+                data[vDataStart + i*tmpW + j] = 255;
+                continue;
+            }
+            
+            //添加上下边框
+            if (i < tmpBorder) {
+                data[vDataStart + i*tmpW + j] = 255;
+                continue;
+            }
+            if (i >= tmpW-tmpBorder) {
+                data[vDataStart + i*tmpW + j] = 255;
+                continue;
+            }
+        }    
+    }
+    
+    fwrite(data, 1, width*height*3/2, fp0);
+    
+    free(data);
+    fclose(fp);
+    fclose(fp0);
+    
+    return TRUE;
+}
+
+int main(int argc, char *argv[])
+{
+    if (argc == 5) {
+        yuv420p_border(argv[1], atoi(argv[2]), atoi(argv[3]), atoi(argv[4]));
+    }
+    
+    return 0;
+}