Drop frames until specified bitrate is achieved.

webrtc/video/vie_encoder.h

 /*
  *  Copyright (c) 2012 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 157 matching lines @@
 
   void OnDroppedFrame() override;
 
   bool EncoderPaused() const;
   void TraceFrameDropStart();
   void TraceFrameDropEnd();
 
   rtc::Event shutdown_event_;
 
   const uint32_t number_of_cores_;
+  // Counts how many frames we've dropped in the initial rampup phase.

[perkj_webrtc, 2017/01/24 09:06:16]

This still happens every time the encoder it reconfigured. And the encoder is
reconfigured every time the incoming frame size change.
Is initil_rampup_ still a good name?

/s since the last time the frame size changed.

[kthelgason, 2017/01/24 10:53:10]

You're right, but we can't have that behaviour. In that case we would get
completely stuck at the limited resolution, and not be able to scale above it
when the quality is good. We need to find another place to reset this variable.

+  int initial_rampup_;
 
   const std::unique_ptr<VideoSourceProxy> source_proxy_;
   EncoderSink* sink_;
   const VideoSendStream::Config::EncoderSettings settings_;
   const VideoCodecType codec_type_;
 
   vcm::VideoSender video_sender_ ACCESS_ON(&encoder_queue_);
   OveruseFrameDetector overuse_detector_ ACCESS_ON(&encoder_queue_);
   std::unique_ptr<QualityScaler> quality_scaler_ ACCESS_ON(&encoder_queue_);
 
@@ skipping 52 matching lines @@
   // All public methods are proxied to |encoder_queue_|. It must must be
   // destroyed first to make sure no tasks are run that use other members.
   rtc::TaskQueue encoder_queue_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(ViEEncoder);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_VIDEO_VIE_ENCODER_H_