Bug 1350912: Set min and start bandwidth according to b=TIAS, instead of only max r=drno

MozReview-Commit-ID: DH1rFn53sNN

media/webrtc/signaling/src/media-conduit/VideoConduit.cpp

@@ -1409,6 +1409,15 @@ WebrtcVideoConduit::SelectBitrates(
     out_max = std::max(static_cast<int>(out_max * ((10 - (framerate / 2)) / 30)), cap);
   }
 
+  // Note: mNegotiatedMaxBitrate is the max transport bitrate - it applies to
+  // a single codec encoding, but should also apply to the sum of all
+  // simulcast layers in this encoding!  So sum(layers.maxBitrate) <=
+  // mNegotiatedMaxBitrate
+  // Note that out_max already has had mPrefMaxBitrate applied to it
+  out_max = MinIgnoreZero((int)mNegotiatedMaxBitrate, out_max);
+  out_min = std::min(out_min, out_max);
+  out_start = std::min(out_start, out_max);
+
   if (mMinBitrate && mMinBitrate > out_min) {
     out_min = mMinBitrate;
   }
@@ -1419,13 +1428,6 @@ WebrtcVideoConduit::SelectBitrates(
   }
   out_start = std::max(out_start, out_min);
 
-  // Note: mNegotiatedMaxBitrate is the max transport bitrate - it applies to
-  // a single codec encoding, but should also apply to the sum of all
-  // simulcast layers in this encoding!  So sum(layers.maxBitrate) <=
-  // mNegotiatedMaxBitrate
-  // Note that out_max already has had mPrefMaxBitrate applied to it
-  out_max = MinIgnoreZero((int)mNegotiatedMaxBitrate, out_max);
-
   MOZ_ASSERT(mPrefMaxBitrate == 0 || out_max <= mPrefMaxBitrate);
 }