Update encoder settings periodically, not only on new bandwidth estimate

webrtc/modules/video_coding/main/source/video_coding_impl.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 75 matching lines @@
                                   bool internalSource);
 
   int32_t CodecConfigParameters(uint8_t* buffer, int32_t size) const;
   int32_t SentFrameCount(VCMFrameCount* frameCount);
   int Bitrate(unsigned int* bitrate) const;
   int FrameRate(unsigned int* framerate) const;
 
   int32_t SetChannelParameters(uint32_t target_bitrate,  // bits/s.
                                uint8_t lossRate,
                                int64_t rtt);
+  int32_t UpdateEncoderParameters();
 
   int32_t RegisterTransportCallback(VCMPacketizationCallback* transport);
   int32_t RegisterSendStatisticsCallback(VCMSendStatisticsCallback* sendStats);
   int32_t RegisterProtectionCallback(VCMProtectionCallback* protection);
   void SetVideoProtection(bool enable, VCMVideoProtection videoProtection);
 
   int32_t AddVideoFrame(const VideoFrame& videoFrame,
                         const VideoContentMetrics* _contentMetrics,
                         const CodecSpecificInfo* codecSpecificInfo);
 
@@ skipping 19 matching lines @@
   VCMCodecDataBase _codecDataBase;
   bool frame_dropper_enabled_;
   VCMProcessTimer _sendStatsTimer;
 
   // Must be accessed on the construction thread of VideoSender.
   VideoCodec current_codec_;
   rtc::ThreadChecker main_thread_;
 
   VCMQMSettingsCallback* const qm_settings_callback_;
   VCMProtectionCallback* protection_callback_;
+
+  rtc::CriticalSection params_lock_;
+  struct EncoderParameters {
+    uint32_t target_bitrate;
+    uint8_t loss_rate;
+    int64_t rtt;
+    uint32_t input_frame_rate;
+    bool updated;
+  } encoder_params_ GUARDED_BY(params_lock_);
 };
 
 class VideoReceiver {
  public:
   typedef VideoCodingModule::ReceiverRobustness ReceiverRobustness;
 
   VideoReceiver(Clock* clock, EventFactory* event_factory);
   ~VideoReceiver();
 
   int32_t RegisterReceiveCodec(const VideoCodec* receiveCodec,
@@ skipping 86 matching lines @@
 
   VCMCodecDataBase _codecDataBase GUARDED_BY(_receiveCritSect);
   VCMProcessTimer _receiveStatsTimer;
   VCMProcessTimer _retransmissionTimer;
   VCMProcessTimer _keyRequestTimer;
 };
 
 }  // namespace vcm
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_VIDEO_CODING_VIDEO_CODING_IMPL_H_