Fix an implicit narrowing conversion found by MSVC

webrtc/call/rtp_demuxer_unittest.cc

 /*
  *  Copyright (c) 2017 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.
  */
 
 #include "webrtc/call/rtp_demuxer.h"
 
 #include <memory>
 #include <set>
 #include <string>
 
 #include "webrtc/call/ssrc_binding_observer.h"
 #include "webrtc/call/test/mock_rtp_packet_sink_interface.h"
 #include "webrtc/common_types.h"
 #include "webrtc/modules/rtp_rtcp/include/rtp_header_extension_map.h"
 #include "webrtc/modules/rtp_rtcp/source/rtp_header_extensions.h"
 #include "webrtc/modules/rtp_rtcp/source/rtp_packet_received.h"
 #include "webrtc/rtc_base/arraysize.h"
 #include "webrtc/rtc_base/basictypes.h"
 #include "webrtc/rtc_base/checks.h"
 #include "webrtc/rtc_base/ptr_util.h"
+#include "webrtc/rtc_base/safe_conversions.h"
 #include "webrtc/test/gmock.h"
 #include "webrtc/test/gtest.h"
 
 namespace webrtc {
 
 namespace {
 
 using ::testing::_;
 using ::testing::AtLeast;
 using ::testing::AtMost;
@@ skipping 302 matching lines @@
 }
 
 TEST_F(RtpDemuxerTest, OnRtpPacketCalledOnCorrectSinkByRsid) {
   const std::string rsids[] = {"a", "b", "c"};
   MockRtpPacketSink sinks[arraysize(rsids)];
   for (size_t i = 0; i < arraysize(rsids); i++) {
     AddSinkOnlyRsid(rsids[i], &sinks[i]);
   }
 
   for (size_t i = 0; i < arraysize(rsids); i++) {
-    auto packet = CreatePacketWithSsrcRsid(i, rsids[i]);
+    auto packet = CreatePacketWithSsrcRsid(rtc::checked_cast<uint32_t>(i),
+                                           rsids[i]);
     EXPECT_CALL(sinks[i], OnRtpPacket(SamePacketAs(*packet))).Times(1);
     EXPECT_TRUE(demuxer_.OnRtpPacket(*packet));
   }
 }
 
 TEST_F(RtpDemuxerTest, OnRtpPacketCalledOnCorrectSinkByMid) {
   const std::string mids[] = {"a", "v", "s"};
   MockRtpPacketSink sinks[arraysize(mids)];
   for (size_t i = 0; i < arraysize(mids); i++) {
     AddSinkOnlyMid(mids[i], &sinks[i]);
   }
 
   for (size_t i = 0; i < arraysize(mids); i++) {
-    auto packet = CreatePacketWithSsrcMid(i, mids[i]);
+    auto packet = CreatePacketWithSsrcMid(rtc::checked_cast<uint32_t>(i),
+                                          mids[i]);
     EXPECT_CALL(sinks[i], OnRtpPacket(SamePacketAs(*packet))).Times(1);
     EXPECT_TRUE(demuxer_.OnRtpPacket(*packet));
   }
 }
 
 TEST_F(RtpDemuxerTest, OnRtpPacketCalledOnCorrectSinkByMidAndRsid) {
   const std::string mid = "v";
   const std::string rsid = "1";
   constexpr uint32_t ssrc = 10;
 
@@ skipping 33 matching lines @@
 }
 
 TEST_F(RtpDemuxerTest, PacketsDeliveredInRightOrder) {
   constexpr uint32_t ssrc = 101;
   MockRtpPacketSink sink;
   AddSinkOnlySsrc(ssrc, &sink);
 
   std::unique_ptr<RtpPacketReceived> packets[5];
   for (size_t i = 0; i < arraysize(packets); i++) {
     packets[i] = CreatePacketWithSsrc(ssrc);
-    packets[i]->SetSequenceNumber(i);
+    packets[i]->SetSequenceNumber(rtc::checked_cast<uint16_t>(i));
   }
 
   InSequence sequence;
   for (const auto& packet : packets) {
     EXPECT_CALL(sink, OnRtpPacket(SamePacketAs(*packet))).Times(1);
   }
 
   for (const auto& packet : packets) {
     EXPECT_TRUE(demuxer_.OnRtpPacket(*packet));
   }
@@ skipping 1087 matching lines @@
 TEST_F(RtpDemuxerTest,
        DregisterationOfNeverRegisteredSsrcBindingObserverDisallowed) {
   MockSsrcBindingObserver observer;
   EXPECT_DEATH(DeregisterSsrcBindingObserver(&observer), "");
 }
 
 #endif
 
 }  // namespace
 }  // namespace webrtc