This project forked from xieyugui/drm_mp4
Trafficserver plugin drm 视频文件拖拽加减密处理 ---mp4
文件访问流程 用户访问边缘节点的文件时,分为从头播放和拖拽播放两种情况。该插件主要参考ats官方的mp4插件写的，该插件默认需要传入一个参数（秘钥），选填参数(0/1 ---生成时，是否需要更新和增加mp4 header)；该插件拖动是根据range 请求大小来的，不是时间。
####从头播放 正常回源,并将 pcf 或 pcm 文件缓存至边缘节点,直接输出该文件即可,不需做额外处理。
####拖拽播放 拖拽播放的情况较复杂,由于加密后文件无法直接支持拖拽播放,所以必须先对加密文件进行解密, 生成flv或mp4文件后,通过flv 和 mp4 的拖拽模块输出新的flv和mp4文件,并对该文件重新进行加密输出。
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