1 /* 2 * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_RATE_STATISTICS_H_ 12 #define WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_RATE_STATISTICS_H_ 13 14 #include "webrtc/system_wrappers/interface/scoped_ptr.h" 15 #include "webrtc/typedefs.h" 16 17 namespace webrtc { 18 19 class RateStatistics { 20 public: 21 // window_size = window size in ms for the rate estimation 22 // scale = coefficient to convert counts/ms to desired units, 23 // ex: if counts represents bytes, use 8*1000 to go to bits/s 24 RateStatistics(uint32_t window_size_ms, float scale); 25 ~RateStatistics(); 26 27 void Reset(); 28 void Update(uint32_t count, int64_t now_ms); 29 uint32_t Rate(int64_t now_ms); 30 31 private: 32 void EraseOld(int64_t now_ms); 33 34 // Counters are kept in buckets (circular buffer), with one bucket 35 // per millisecond. 36 const int num_buckets_; 37 scoped_ptr<uint32_t[]> buckets_; 38 39 // Total count recorded in buckets. 40 uint32_t accumulated_count_; 41 42 // Oldest time recorded in buckets. 43 int64_t oldest_time_; 44 45 // Bucket index of oldest counter recorded in buckets. 46 int oldest_index_; 47 48 // To convert counts/ms to desired units 49 const float scale_; 50 }; 51 } // namespace webrtc 52 53 #endif // WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_RATE_STATISTICS_H_ 54
