00b8f6b364
BUG= R=andrew@webrtc.org Review URL: https://webrtc-codereview.appspot.com/36229004 Cr-Commit-Position: refs/heads/master@{#8517} git-svn-id: http://webrtc.googlecode.com/svn/trunk@8517 4adac7df-926f-26a2-2b94-8c16560cd09d
54 lines
1.6 KiB
C++
54 lines
1.6 KiB
C++
/*
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* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_RATE_STATISTICS_H_
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#define WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_RATE_STATISTICS_H_
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#include "webrtc/base/scoped_ptr.h"
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#include "webrtc/typedefs.h"
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namespace webrtc {
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class RateStatistics {
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public:
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// window_size = window size in ms for the rate estimation
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// scale = coefficient to convert counts/ms to desired units,
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// ex: if counts represents bytes, use 8*1000 to go to bits/s
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RateStatistics(uint32_t window_size_ms, float scale);
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~RateStatistics();
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void Reset();
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void Update(size_t count, int64_t now_ms);
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uint32_t Rate(int64_t now_ms);
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private:
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void EraseOld(int64_t now_ms);
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// Counters are kept in buckets (circular buffer), with one bucket
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// per millisecond.
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const int num_buckets_;
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rtc::scoped_ptr<size_t[]> buckets_;
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// Total count recorded in buckets.
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size_t accumulated_count_;
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// Oldest time recorded in buckets.
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int64_t oldest_time_;
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// Bucket index of oldest counter recorded in buckets.
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int oldest_index_;
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// To convert counts/ms to desired units
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const float scale_;
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};
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} // namespace webrtc
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#endif // WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_RATE_STATISTICS_H_
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