Periodically update codec bit/frame rate settings.

webrtc/video/vie_encoder.cc

Index: webrtc/video/vie_encoder.cc
diff --git a/webrtc/video/vie_encoder.cc b/webrtc/video/vie_encoder.cc
index 203d1c405a8813d05b627cd464803bb9df39f645..6e48f97e66a369da9956bea64c10a1261bc7e0ee 100644
--- a/webrtc/video/vie_encoder.cc
+++ b/webrtc/video/vie_encoder.cc
@@ -211,7 +211,6 @@ class ViEEncoder::VideoSourceProxy {
     // the used degradation_preference.
     switch (degradation_preference_) {
       case VideoSendStream::DegradationPreference::kBalanced:
-        FALLTHROUGH();
       case VideoSendStream::DegradationPreference::kMaintainFramerate:
         wants.max_framerate_fps = std::numeric_limits<int>::max();
         break;
@@ -677,13 +676,14 @@ void ViEEncoder::EncodeVideoFrame(const VideoFrame& video_frame,
   int64_t now_ms = clock_->TimeInMilliseconds();
   if (pending_encoder_reconfiguration_) {
     ReconfigureEncoder();
+    last_parameters_update_ms_.emplace(now_ms);
   } else if (!last_parameters_update_ms_ ||
              now_ms - *last_parameters_update_ms_ >=
                  vcm::VCMProcessTimer::kDefaultProcessIntervalMs) {
     video_sender_.UpdateChannelParemeters(rate_allocator_.get(),
                                           bitrate_observer_);
+    last_parameters_update_ms_.emplace(now_ms);
   }
-  last_parameters_update_ms_.emplace(now_ms);
 
   if (EncoderPaused()) {
     TraceFrameDropStart();
@@ -806,7 +806,6 @@ void ViEEncoder::AdaptDown(AdaptReason reason) {
   int max_downgrades = 0;
   switch (degradation_preference_) {
     case VideoSendStream::DegradationPreference::kBalanced:
-      FALLTHROUGH();
     case VideoSendStream::DegradationPreference::kMaintainFramerate:
       max_downgrades = kMaxCpuResolutionDowngrades;
       if (downgrade_requested &&
@@ -842,7 +841,6 @@ void ViEEncoder::AdaptDown(AdaptReason reason) {
 
   switch (degradation_preference_) {
     case VideoSendStream::DegradationPreference::kBalanced:
-      FALLTHROUGH();
     case VideoSendStream::DegradationPreference::kMaintainFramerate:
       // Scale down resolution.
       if (!source_proxy_->RequestResolutionLowerThan(
@@ -890,7 +888,6 @@ void ViEEncoder::AdaptUp(AdaptReason reason) {
 
   switch (degradation_preference_) {
     case VideoSendStream::DegradationPreference::kBalanced:
-      FALLTHROUGH();
     case VideoSendStream::DegradationPreference::kMaintainFramerate:
       if (adapt_up_requested &&
           adaptation_request.input_pixel_count_ <=
@@ -910,7 +907,6 @@ void ViEEncoder::AdaptUp(AdaptReason reason) {
 
   switch (degradation_preference_) {
     case VideoSendStream::DegradationPreference::kBalanced:
-      FALLTHROUGH();
     case VideoSendStream::DegradationPreference::kMaintainFramerate: {
       // Scale up resolution.
       int pixel_count = adaptation_request.input_pixel_count_;