Add overhead to audio bwe min, max.

webrtc/media/engine/webrtcvoiceengine_unittest.cc

 /*
  *  Copyright (c) 2008 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 2453 matching lines @@
   options.audio_network_adaptor = rtc::Optional<bool>();
   // Unvalued |options.audio_network_adaptor|.should not reset audio network
   // adaptor.
   SetAudioSend(kSsrc1, true, nullptr, &options);
   // AudioSendStream not expected to be recreated.
   EXPECT_EQ(initial_num, call_.GetNumCreatedSendStreams());
   EXPECT_EQ(send_parameters_.options.audio_network_adaptor_config,
             GetAudioNetworkAdaptorConfig(kSsrc1));
 }
 
+class WebRtcVoiceEngineWithSendSideBweWithOverheadTest
+    : public WebRtcVoiceEngineTestFake {
+ public:
+  WebRtcVoiceEngineWithSendSideBweWithOverheadTest()
+      : WebRtcVoiceEngineTestFake(
+            "WebRTC-Audio-SendSideBwe/Enabled/WebRTC-SendSideBwe-WithOverhead/"
+            "Enabled/") {}
+};
+
+TEST_F(WebRtcVoiceEngineWithSendSideBweWithOverheadTest, MinAndMaxBitrate) {
+  EXPECT_TRUE(SetupSendStream());
+  cricket::AudioSendParameters parameters;
+  parameters.codecs.push_back(kOpusCodec);
+  SetSendParameters(parameters);
+  const int initial_num = call_.GetNumCreatedSendStreams();
+  EXPECT_EQ(initial_num, call_.GetNumCreatedSendStreams());
+
+  // OverheadPerPacket = Ipv4(20B) + UDP(8B) + SRTP(10B) + RTP(12)
+  constexpr int kOverheadPerPacket = 20 + 8 + 10 + 12;
+  constexpr int kMinOverheadBps = kOverheadPerPacket * 8 * 1000 / 60;
+  constexpr int kMaxOverheadBps = kOverheadPerPacket * 8 * 1000 / 20;
+
+  constexpr int kOpusMinBitrateBps = 6000;
+  EXPECT_EQ(kOpusMinBitrateBps + kMinOverheadBps,
+            GetSendStreamConfig(kSsrc1).min_bitrate_bps);
+  constexpr int kOpusBitrateFbBps = 32000;
+  EXPECT_EQ(kOpusBitrateFbBps + kMaxOverheadBps,
+            GetSendStreamConfig(kSsrc1).max_bitrate_bps);
+}
+
 // Test that we can set the outgoing SSRC properly.
 // SSRC is set in SetupSendStream() by calling AddSendStream.
 TEST_F(WebRtcVoiceEngineTestFake, SetSendSsrc) {
   EXPECT_TRUE(SetupSendStream());
   EXPECT_TRUE(call_.GetAudioSendStream(kSsrc1));
 }
 
 TEST_F(WebRtcVoiceEngineTestFake, GetStats) {
   // Setup. We need send codec to be set to get all stats.
   EXPECT_TRUE(SetupSendStream());
@@ skipping 1068 matching lines @@
       nullptr, webrtc::CreateBuiltinAudioDecoderFactory());
   webrtc::RtcEventLogNullImpl event_log;
   std::unique_ptr<webrtc::Call> call(
       webrtc::Call::Create(webrtc::Call::Config(&event_log)));
   cricket::WebRtcVoiceMediaChannel channel(&engine, cricket::MediaConfig(),
                                            cricket::AudioOptions(), call.get());
   cricket::AudioRecvParameters parameters;
   parameters.codecs = engine.recv_codecs();
   EXPECT_TRUE(channel.SetRecvParameters(parameters));
 }