如果该文件不存在或者有明确请求要求刷新文件，则代码获取存储在Amazon上的所有ami的详细列表。
If the file doesn't exist or there is an explicit request to refresh it, the code gets the list of details for all the AMIs at Amazon.
说明：DSP下的YUV转RGB图像程序，代码详细规范，有注释，适合新手使用。
DSP YUV to RGB image under the program, code detail specification, with annotations, suitable for novices to use.
汇编实例教程，内有汇编源代码多个，有详细注释说明。
Compilation of tutorial examples with source code has compiled more than detailed notes.
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