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

webrtc/video/payload_router_unittest.cc

 /*
  *  Copyright (c) 2015 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 160 matching lines @@
   BitrateAllocation layer1_bitrate;
   layer1_bitrate.SetBitrate(0, 0, 40000);
   layer1_bitrate.SetBitrate(0, 1, 80000);
 
   EXPECT_CALL(rtp_1, SetVideoBitrateAllocation(layer0_bitrate)).Times(1);
   EXPECT_CALL(rtp_2, SetVideoBitrateAllocation(layer1_bitrate)).Times(1);
 
   payload_router.OnBitrateAllocationUpdated(bitrate);
 }
 
+TEST(PayloadRouterTest, SimulcastTargetBitrateWithInactiveStream) {
+  // Set up two active rtp modules.
+  NiceMock<MockRtpRtcp> rtp_1;
+  NiceMock<MockRtpRtcp> rtp_2;
+  std::vector<RtpRtcp*> modules;
+  modules.push_back(&rtp_1);
+  modules.push_back(&rtp_2);
+  PayloadRouter payload_router(modules, 42);
+  payload_router.SetActive(true);
+
+  // Create bitrate allocation with bitrate only for the first stream.
+  BitrateAllocation bitrate;
+  bitrate.SetBitrate(0, 0, 10000);
+  bitrate.SetBitrate(0, 1, 20000);
+
+  // Expect only the first rtp module to be asked to send a TargetBitrate
+  // message. (No target bitrate with 0bps sent from the second one.)
+  EXPECT_CALL(rtp_1, SetVideoBitrateAllocation(bitrate)).Times(1);
+  EXPECT_CALL(rtp_2, SetVideoBitrateAllocation(_)).Times(0);
+
+  payload_router.OnBitrateAllocationUpdated(bitrate);
+}
+
 TEST(PayloadRouterTest, SvcTargetBitrate) {
   NiceMock<MockRtpRtcp> rtp_1;
   std::vector<RtpRtcp*> modules;
   modules.push_back(&rtp_1);
   PayloadRouter payload_router(modules, 42);
   payload_router.SetActive(true);
 
   BitrateAllocation bitrate;
   bitrate.SetBitrate(0, 0, 10000);
   bitrate.SetBitrate(0, 1, 20000);
   bitrate.SetBitrate(1, 0, 40000);
   bitrate.SetBitrate(1, 1, 80000);
 
   EXPECT_CALL(rtp_1, SetVideoBitrateAllocation(bitrate)).Times(1);
 
   payload_router.OnBitrateAllocationUpdated(bitrate);
 }
 
 }  // namespace webrtc