diff --git a/samples/sample_c/module_sample/camera_emu/dji_media_file_manage/dji_media_file_core.c b/samples/sample_c/module_sample/camera_emu/dji_media_file_manage/dji_media_file_core.c
index 644ca4e..b99d40b 100644
--- a/samples/sample_c/module_sample/camera_emu/dji_media_file_manage/dji_media_file_core.c
+++ b/samples/sample_c/module_sample/camera_emu/dji_media_file_manage/dji_media_file_core.c
@@ -93,11 +93,11 @@ bool DjiMediaFile_IsSupported(const char *filePath)
 
 T_DjiReturnCode DjiMediaFile_CreateHandle(const char *filePath, T_DjiMediaFileHandle *pMediaFileHandle)
 {
-    int optIndex;
+    int optIndex;//这个指数 指明了 filePath中的文件格式 处于数组s_mediaFileOpt中的哪一个元素
     T_DjiOsalHandler *osalHandler = DjiPlatform_GetOsalHandler();
 
     for (optIndex = 0; optIndex < s_mediaFileOptCount; optIndex++) {
-        if (s_mediaFileOpt[optIndex].isSupportedFunc(filePath) == true) {
+        if (s_mediaFileOpt[optIndex].isSupportedFunc(filePath) == true) {//查看filePath的格式是否 存在于 所有支持的格式中
             break;
         }
     }
@@ -116,7 +116,7 @@ T_DjiReturnCode DjiMediaFile_CreateHandle(const char *filePath, T_DjiMediaFileHa
         return DJI_ERROR_SYSTEM_MODULE_CODE_MEMORY_ALLOC_FAILED;
     }
 
-    (*pMediaFileHandle)->mediaFileOptItem = s_mediaFileOpt[optIndex];
+    (*pMediaFileHandle)->mediaFileOptItem = s_mediaFileOpt[optIndex];//为pMediaFileHandle(媒体文件句柄)添加处理函数
     (*pMediaFileHandle)->mediaFileThm.privThm = NULL;
     (*pMediaFileHandle)->mediaFileScr.privScr = NULL;