Update bitrate only when we have incoming packet.

webrtc/call/congestion_controller.cc

Index: webrtc/call/congestion_controller.cc
diff --git a/webrtc/call/congestion_controller.cc b/webrtc/call/congestion_controller.cc
index 08cdb11d2fbaf66a385429a66fe6e197cbef4200..59713d30576cec2b98ed55752e6e457b0d92f2d9 100644
--- a/webrtc/call/congestion_controller.cc
+++ b/webrtc/call/congestion_controller.cc
@@ -10,6 +10,7 @@
 
 #include "webrtc/call/congestion_controller.h"
 
+#include <algorithm>
 #include <vector>
 
 #include "webrtc/base/checks.h"
@@ -82,11 +83,6 @@ class WrappingBitrateEstimator : public RemoteBitrateEstimator {
     return rbe_->LatestEstimate(ssrcs, bitrate_bps);
   }
 
-  bool GetStats(ReceiveBandwidthEstimatorStats* output) const override {
-    CriticalSectionScoped cs(crit_sect_.get());
-    return rbe_->GetStats(output);
-  }
-
   void SetMinBitrate(int min_bitrate_bps) {
     CriticalSectionScoped cs(crit_sect_.get());
     rbe_->SetMinBitrate(min_bitrate_bps);
@@ -193,8 +189,18 @@ CongestionController::~CongestionController() {
 void CongestionController::SetBweBitrates(int min_bitrate_bps,
                                           int start_bitrate_bps,
                                           int max_bitrate_bps) {
-  if (start_bitrate_bps > 0)
+  // TODO(holmer): We should make sure the default bitrates are set to 10 kbps,
+  // and that we don't try to set the min bitrate to 0 from any applications.
+  // The congestion controller should allow a min bitrate of 0.
+  const int kMinBitrateBps = 10000;
+  if (min_bitrate_bps < kMinBitrateBps)
+    min_bitrate_bps = kMinBitrateBps;
+  if (max_bitrate_bps > 0)
+    max_bitrate_bps = std::max(min_bitrate_bps, max_bitrate_bps);
+  if (start_bitrate_bps > 0) {
+    start_bitrate_bps = std::max(min_bitrate_bps, start_bitrate_bps);
     bitrate_controller_->SetStartBitrate(start_bitrate_bps);
+  }
   bitrate_controller_->SetMinMaxBitrate(min_bitrate_bps, max_bitrate_bps);
   if (remote_bitrate_estimator_.get())
     remote_bitrate_estimator_->SetMinBitrate(min_bitrate_bps);