Fix rtcp_sender to support sdes with 31 chunk

webrtc/modules/rtp_rtcp/source/rtcp_sender_unittest.cc

 /*
  *  Copyright (c) 2012 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 369 matching lines @@
 TEST_F(RtcpSenderTest, SendSdes) {
   rtcp_sender_->SetRTCPStatus(RtcpMode::kReducedSize);
   EXPECT_EQ(0, rtcp_sender_->SetCNAME("alice@host"));
   EXPECT_EQ(0, rtcp_sender_->SendRTCP(feedback_state(), kRtcpSdes));
   EXPECT_EQ(1, parser()->sdes()->num_packets());
   EXPECT_EQ(1U, parser()->sdes()->chunks().size());
   EXPECT_EQ(kSenderSsrc, parser()->sdes()->chunks()[0].ssrc);
   EXPECT_EQ("alice@host", parser()->sdes()->chunks()[0].cname);
 }
 
+TEST_F(RtcpSenderTest, SendSdesWithMaxChunks) {
+  rtcp_sender_->SetRTCPStatus(RtcpMode::kReducedSize);
+  EXPECT_EQ(0, rtcp_sender_->SetCNAME("alice@host"));
+  const char cname[] = "smith@host";
+  for (size_t i = 0; i < 30; ++i) {
+    const uint32_t csrc = 0x1234 + i;
+    EXPECT_EQ(0, rtcp_sender_->AddMixedCNAME(csrc, cname));
+  }
+  EXPECT_EQ(0, rtcp_sender_->SendRTCP(feedback_state(), kRtcpSdes));
+  EXPECT_EQ(1, parser()->sdes()->num_packets());
+  EXPECT_EQ(31U, parser()->sdes()->chunks().size());
+}
+
 TEST_F(RtcpSenderTest, SdesIncludedInCompoundPacket) {
   rtcp_sender_->SetRTCPStatus(RtcpMode::kCompound);
   EXPECT_EQ(0, rtcp_sender_->SetCNAME("alice@host"));
   EXPECT_EQ(0, rtcp_sender_->SendRTCP(feedback_state(), kRtcpReport));
   EXPECT_EQ(1, parser()->receiver_report()->num_packets());
   EXPECT_EQ(1, parser()->sdes()->num_packets());
   EXPECT_EQ(1U, parser()->sdes()->chunks().size());
 }
 
 TEST_F(RtcpSenderTest, SendBye) {
@@ skipping 401 matching lines @@
       const rtcp::TargetBitrate::BitrateItem& item = bitrates[index];
       EXPECT_EQ(sl, item.spatial_layer);
       EXPECT_EQ(tl, item.temporal_layer);
       EXPECT_EQ(start_bitrate_bps + (tl * 20000),
                 item.target_bitrate_kbps * 1000);
     }
   }
 }
 
 }  // namespace webrtc