Reland of Periodically update codec bit/frame rate settings.

webrtc/test/fake_encoder.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.
  */
 
@@ skipping 27 matching lines @@
   int32_t Encode(const VideoFrame& input_image,
                  const CodecSpecificInfo* codec_specific_info,
                  const std::vector<FrameType>* frame_types) override;
   int32_t RegisterEncodeCompleteCallback(
       EncodedImageCallback* callback) override;
   int32_t Release() override;
   int32_t SetChannelParameters(uint32_t packet_loss, int64_t rtt) override;
   int32_t SetRateAllocation(const BitrateAllocation& rate_allocation,
                             uint32_t framerate) override;
   const char* ImplementationName() const override;
+  int GetConfiguredInputFramerate() const;
 
   static const char* kImplementationName;
 
  protected:
   Clock* const clock_;
   VideoCodec config_ GUARDED_BY(crit_sect_);
   EncodedImageCallback* callback_ GUARDED_BY(crit_sect_);
   BitrateAllocation target_bitrate_ GUARDED_BY(crit_sect_);
+  int configured_input_framerate_ GUARDED_BY(crit_sect_);
   int max_target_bitrate_kbps_ GUARDED_BY(crit_sect_);
-  int64_t last_encode_time_ms_ GUARDED_BY(crit_sect_);
+  bool pending_keyframe_ GUARDED_BY(crit_sect_);
   rtc::CriticalSection crit_sect_;
 
   uint8_t encoded_buffer_[100000];
+
+  // Current byte debt to be payed over a number of frames.
+  // The debt is acquired by keyframes overshooting the bitrate target.
+  size_t debt_bytes_;
 };
 
 class FakeH264Encoder : public FakeEncoder, public EncodedImageCallback {
  public:
   explicit FakeH264Encoder(Clock* clock);
   virtual ~FakeH264Encoder() = default;
 
   int32_t RegisterEncodeCompleteCallback(
       EncodedImageCallback* callback) override;
 
@@ skipping 51 matching lines @@
   int current_queue_ ACCESS_ON(sequence_checker_);
   std::unique_ptr<rtc::TaskQueue> queue1_ ACCESS_ON(sequence_checker_);
   std::unique_ptr<rtc::TaskQueue> queue2_ ACCESS_ON(sequence_checker_);
   rtc::SequencedTaskChecker sequence_checker_;
 };
 
 }  // namespace test
 }  // namespace webrtc
 
 #endif  // WEBRTC_TEST_FAKE_ENCODER_H_