tree badaf6dd1aaaed21ad560e36a76354646b447ca4
parent f888020c6e2735624f2b2a30e72aca24e17b8b4d
author Marco Nelissen <marcone@google.com> 1418238332 -0800
committer Marco Nelissen <marcone@google.com> 1418238332 -0800

Truncate file before recording into it.

Recording into an existing file of non-zero length could leave old
data in the file after the recording ends. Best case that wastes
space, worst case it results in a file that's considered corrupt
on playback.

Change-Id: I2c77a107603b2b36790958360ff0856c2b28d677