Move BitrateAdjuster into common_video

webrtc/modules/video_coding/include/bitrate_adjuster.h

-/*
- *  Copyright 2016 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_VIDEO_CODING_INCLUDE_BITRATE_ADJUSTER_H_
-#define WEBRTC_MODULES_VIDEO_CODING_INCLUDE_BITRATE_ADJUSTER_H_
-
-#include <functional>
-
-#include "webrtc/base/criticalsection.h"
-#include "webrtc/base/rate_statistics.h"
-
-namespace webrtc {
-
-class Clock;
-
-// Certain hardware encoders tend to consistently overshoot the bitrate that
-// they are configured to encode at. This class estimates an adjusted bitrate
-// that when set on the encoder will produce the desired bitrate.
-class BitrateAdjuster {
- public:
-  // min_adjusted_bitrate_pct and max_adjusted_bitrate_pct are the lower and
-  // upper bound outputted adjusted bitrates as a percentage of the target
-  // bitrate.
-  BitrateAdjuster(Clock* clock,
-                  float min_adjusted_bitrate_pct,
-                  float max_adjusted_bitrate_pct);
-  virtual ~BitrateAdjuster() {}
-
-  static const uint32_t kBitrateUpdateIntervalMs;
-  static const uint32_t kBitrateUpdateFrameInterval;
-  static const float kBitrateTolerancePct;
-  static const float kBytesPerMsToBitsPerSecond;
-
-  // Sets the desired bitrate in bps (bits per second).
-  // Should be called at least once before Update.
-  void SetTargetBitrateBps(uint32_t bitrate_bps);
-  uint32_t GetTargetBitrateBps() const;
-
-  // Returns the adjusted bitrate in bps.
-  uint32_t GetAdjustedBitrateBps() const;
-
-  // Returns what we think the current bitrate is.
-  uint32_t GetEstimatedBitrateBps();
-
-  // This should be called after each frame is encoded. The timestamp at which
-  // it is called is used to estimate the output bitrate of the encoder.
-  // Should be called from only one thread.
-  void Update(size_t frame_size);
-
- private:
-  // Returns true if the bitrate is within kBitrateTolerancePct of bitrate_bps.
-  bool IsWithinTolerance(uint32_t bitrate_bps, uint32_t target_bitrate_bps);
-
-  // Returns smallest possible adjusted value.
-  uint32_t GetMinAdjustedBitrateBps() const EXCLUSIVE_LOCKS_REQUIRED(crit_);
-  // Returns largest possible adjusted value.
-  uint32_t GetMaxAdjustedBitrateBps() const EXCLUSIVE_LOCKS_REQUIRED(crit_);
-
-  void Reset();
-  void UpdateBitrate(uint32_t current_time_ms) EXCLUSIVE_LOCKS_REQUIRED(crit_);
-
-  rtc::CriticalSection crit_;
-  Clock* const clock_;
-  const float min_adjusted_bitrate_pct_;
-  const float max_adjusted_bitrate_pct_;
-  // The bitrate we want.
-  volatile uint32_t target_bitrate_bps_ GUARDED_BY(crit_);
-  // The bitrate we use to get what we want.
-  volatile uint32_t adjusted_bitrate_bps_ GUARDED_BY(crit_);
-  // The target bitrate that the adjusted bitrate was computed from.
-  volatile uint32_t last_adjusted_target_bitrate_bps_ GUARDED_BY(crit_);
-  // Used to estimate bitrate.
-  RateStatistics bitrate_tracker_ GUARDED_BY(crit_);
-  // The last time we tried to adjust the bitrate.
-  uint32_t last_bitrate_update_time_ms_ GUARDED_BY(crit_);
-  // The number of frames since the last time we tried to adjust the bitrate.
-  uint32_t frames_since_last_update_ GUARDED_BY(crit_);
-};
-
-}  // namespace webrtc
-
-#endif  // WEBRTC_MODULES_VIDEO_CODING_INCLUDE_BITRATE_ADJUSTER_H_