Allow parsing empty RTCP TargetBitrate messages, but stop sending them.

webrtc/common_types.cc

Index: webrtc/common_types.cc
diff --git a/webrtc/common_types.cc b/webrtc/common_types.cc
index 5cbc452db33f82735092fd28460a56859f70e982..f495142d29a996de15f502979a20c87e052c76f2 100644
--- a/webrtc/common_types.cc
+++ b/webrtc/common_types.cc
@@ -207,4 +207,52 @@ uint32_t BitrateAllocation::GetSpatialLayerSum(size_t spatial_index) const {
   return sum;
 }
 
+std::string BitrateAllocation::ToString() const {
+  if (sum_ == 0)
+    return "BitrateAllocation [ [] ]";
+
+  std::ostringstream oss;
+  oss << "BitrateAllocation [";
+  uint32_t spatial_cumulator = 0;
+  for (int si = 0; si < kMaxSpatialLayers; ++si) {
+    RTC_DCHECK_LE(spatial_cumulator, sum_);
+    if (spatial_cumulator == sum_)
+      break;
+
+    const uint32_t layer_sum = GetSpatialLayerSum(si);
+    if (layer_sum == sum_) {
+      oss << " [";
+    } else {
+      if (si > 0)
+        oss << ",";
+      oss << std::endl << "  [";
+    }
+    spatial_cumulator += layer_sum;
+
+    uint32_t temporal_cumulator = 0;
+    for (int ti = 0; ti < kMaxTemporalStreams; ++ti) {
+      RTC_DCHECK_LE(temporal_cumulator, layer_sum);
+      if (temporal_cumulator == layer_sum)
+        break;
+
+      if (ti > 0)
+        oss << ", ";
+
+      uint32_t bitrate = bitrates_[si][ti];
+      oss << bitrate;
+      temporal_cumulator += bitrate;
+    }
+    oss << "]";
+  }
+
+  RTC_DCHECK_EQ(spatial_cumulator, sum_);
+  oss << " ]";
+  return oss.str();
+}
+
+std::ostream& operator<<(std::ostream& os, const BitrateAllocation& bitrate) {
+  os << bitrate.ToString();
+  return os;
+}
+
 }  // namespace webrtc