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/*
* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_RATE_STATISTICS_H_
#define WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_RATE_STATISTICS_H_
#include "webrtc/system_wrappers/interface/scoped_ptr.h"
#include "webrtc/typedefs.h"
namespace webrtc {
class RateStatistics {
public:
// window_size = window size in ms for the rate estimation
// scale = coefficient to convert counts/ms to desired units,
// ex: if counts represents bytes, use 8*1000 to go to bits/s
RateStatistics(uint32_t window_size_ms, float scale);
~RateStatistics();
void Reset();
void Update(uint32_t count, int64_t now_ms);
uint32_t Rate(int64_t now_ms);
private:
void EraseOld(int64_t now_ms);
// Counters are kept in buckets (circular buffer), with one bucket
// per millisecond.
const int num_buckets_;
scoped_ptr<uint32_t[]> buckets_;
// Total count recorded in buckets.
uint32_t accumulated_count_;
// Oldest time recorded in buckets.
int64_t oldest_time_;
// Bucket index of oldest counter recorded in buckets.
int oldest_index_;
// To convert counts/ms to desired units
const float scale_;
};
} // namespace webrtc
#endif // WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_RATE_STATISTICS_H_
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