Bitrate controller for VideoToolbox encoder.

webrtc/modules/remote_bitrate_estimator/rate_statistics.h

-/*
- *  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/base/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(size_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_;
-  rtc::scoped_ptr<size_t[]> buckets_;
-
-  // Total count recorded in buckets.
-  size_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_