webrtc android里的统一时间戳单位

SurfaceTexture.getTimestamp()是纳秒级的时间单位,这个时间实际上是一个相对时间戳，因此初使的时间是不肯定的.java 官方对于这个时间的解释: Some cameras have built in timestamping which is more accurate than reading the system clock, but using a differen

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