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1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "media/base/moving_average.h" | |
6 | |
7 #include <algorithm> | |
8 | |
9 namespace media { | |
10 | |
11 MovingAverage::MovingAverage(size_t depth) | |
12 : depth_(depth), | |
13 count_(0), | |
14 samples_(new base::TimeDelta[depth]) { | |
15 } | |
16 | |
17 MovingAverage::~MovingAverage() {} | |
18 | |
19 void MovingAverage::AddSample(base::TimeDelta sample) { | |
20 if (count_ < depth_) { | |
21 samples_[count_++] = sample; | |
22 total_ += sample; | |
23 return; | |
24 } | |
xhwang
2015/04/28 16:01:07
If you initialize |samples_| with all zeros (which
DaleCurtis
2015/04/28 21:45:23
Done.
| |
25 | |
26 base::TimeDelta& oldest = samples_[count_++ % depth_]; | |
27 total_ += sample - oldest; | |
28 oldest = sample; | |
29 } | |
30 | |
31 base::TimeDelta MovingAverage::Average() const { | |
32 DCHECK_GT(count_, 0u); | |
33 return total_ / std::min(depth_, count_); | |
xhwang
2015/04/28 16:01:07
nit: If we always choose a |depth_| of a power of
DaleCurtis
2015/04/28 21:45:24
Hmm, I feel that's a bit of premature optimization
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34 } | |
35 | |
36 void MovingAverage::Reset() { | |
37 count_ = 0; | |
38 total_ = base::TimeDelta(); | |
39 } | |
40 | |
41 } // namespace media | |
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