Remove overhead from video bitrate.

webrtc/video/video_send_stream_tests.cc

 /*
  *  Copyright (c) 2013 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 <algorithm>  // max
@@ skipping 18 matching lines @@
 #include "webrtc/system_wrappers/include/sleep.h"
 #include "webrtc/test/call_test.h"
 #include "webrtc/test/configurable_frame_size_encoder.h"
 #include "webrtc/test/fake_texture_frame.h"
 #include "webrtc/test/frame_generator.h"
 #include "webrtc/test/frame_utils.h"
 #include "webrtc/test/gtest.h"
 #include "webrtc/test/null_transport.h"
 #include "webrtc/test/rtcp_packet_parser.h"
 #include "webrtc/test/testsupport/perf_test.h"
+#include "webrtc/test/field_trial.h"
 
 #include "webrtc/video/send_statistics_proxy.h"
 #include "webrtc/video/transport_adapter.h"
 #include "webrtc/video_frame.h"
 #include "webrtc/video_send_stream.h"
 
 namespace webrtc {
 
 enum VideoFormat { kGeneric, kVP8, };
 
@@ skipping 3118 matching lines @@
 TEST_F(VideoSendStreamTest,
        RequestSourceRotateIfVideoOrientationExtensionNotSupported) {
   TestRequestSourceRotateVideo(false);
 }
 
 TEST_F(VideoSendStreamTest,
        DoNotRequestsRotationIfVideoOrientationExtensionSupported) {
   TestRequestSourceRotateVideo(true);
 }
 
+// This test verifies that overhead is removed from the bandwidth estimate by
+// testing that the maximum possible target payload rate is smaller than the
+// maximum bandwidth estimate by the overhead rate.
+TEST_F(VideoSendStreamTest, RemoveOverheadFromBandwidth) {
+  class RemoveOverheadFromBandwidthTest : public test::EndToEndTest,
+                                          public test::FakeEncoder {
+   public:
+    RemoveOverheadFromBandwidthTest()
+        : EndToEndTest(test::CallTest::kDefaultTimeoutMs),
+          FakeEncoder(Clock::GetRealTimeClock()),
+          call_(nullptr),
+          max_bitrate_kbps_(0) {}
+
+    int32_t SetRateAllocation(const BitrateAllocation& bitrate,
+                              uint32_t frameRate) override {
+      if (max_bitrate_kbps_ < bitrate.get_sum_kbps())
+        max_bitrate_kbps_ = bitrate.get_sum_kbps();
+      return FakeEncoder::SetRateAllocation(bitrate, frameRate);
+    }
+
+    void OnCallsCreated(Call* sender_call, Call* receiver_call) override {
+      call_ = sender_call;
+    }
+
+    void ModifyVideoConfigs(
+        VideoSendStream::Config* send_config,
+        std::vector<VideoReceiveStream::Config>* receive_configs,
+        VideoEncoderConfig* encoder_config) override {
+      send_config->rtp.max_packet_size = 1200;
+      send_config->encoder_settings.encoder = this;
+      EXPECT_FALSE(send_config->rtp.extensions.empty());
+    }
+
+    void PerformTest() override {
+      call_->OnTransportOverheadChanged(webrtc::MediaType::VIDEO, 20);
+      Call::Config::BitrateConfig bitrate_config;
+      constexpr int kStartBitrateBps = 50000;
+      constexpr int kMaxBitrateBps = 60000;
+      bitrate_config.start_bitrate_bps = kStartBitrateBps;
+      bitrate_config.max_bitrate_bps = kMaxBitrateBps;
+
+      test::ScopedFieldTrials override_field_trials_(

[minyue-webrtc, 2016/11/25 10:50:33]

nit: override_field_trials

[michaelt, 2016/11/28 13:52:21]

Done.

+          "WebRTC-SendSideBwe-WithOverhead/Enabled/");
+      call_->SetBitrateConfig(bitrate_config);
+
+      // At a bitrate of 60kbps with a packet size of 1200B video and an
+      // overhead of 40B per packet video produces 2kbps overhead.
+      // So with a BWE should reach 58kbps but not 60kbps.
+      Wait();
+      EXPECT_EQ(58u, max_bitrate_kbps_);
+    }
+
+   private:
+    Call* call_;
+    uint32_t max_bitrate_kbps_;
+  } test;
+
+  RunBaseTest(&test);
+}
+
 }  // namespace webrtc