Revert of Refactor NACK bitrate allocation

webrtc/base/rate_limiter_unittest.cc

-/*
- *  Copyright (c) 2016 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>
-#include <memory>
-
-#include "testing/gtest/include/gtest/gtest.h"
-
-#include "webrtc/base/event.h"
-#include "webrtc/base/platform_thread.h"
-#include "webrtc/base/rate_limiter.h"
-#include "webrtc/base/task_queue.h"
-#include "webrtc/system_wrappers/include/clock.h"
-
-namespace webrtc {
-
-class RateLimitTest : public ::testing::Test {
- public:
-  RateLimitTest()
-      : clock_(0), rate_limiter(new RateLimiter(&clock_, kWindowSizeMs)) {}
-  virtual ~RateLimitTest() {}
-
-  void SetUp() override { rate_limiter->SetMaxRate(kMaxRateBps); }
-
- protected:
-  static constexpr int64_t kWindowSizeMs = 1000;
-  static constexpr uint32_t kMaxRateBps = 100000;
-  // Bytes needed to completely saturate the rate limiter.
-  static constexpr size_t kRateFillingBytes =
-      (kMaxRateBps * kWindowSizeMs) / (8 * 1000);
-  SimulatedClock clock_;
-  std::unique_ptr<RateLimiter> rate_limiter;
-};
-
-TEST_F(RateLimitTest, IncreasingMaxRate) {
-  // Fill rate, extend window to full size.
-  EXPECT_TRUE(rate_limiter->TryUseRate(kRateFillingBytes / 2));
-  clock_.AdvanceTimeMilliseconds(kWindowSizeMs - 1);
-  EXPECT_TRUE(rate_limiter->TryUseRate(kRateFillingBytes / 2));
-
-  // All rate consumed.
-  EXPECT_FALSE(rate_limiter->TryUseRate(1));
-
-  // Double the available rate and fill that too.
-  rate_limiter->SetMaxRate(kMaxRateBps * 2);
-  EXPECT_TRUE(rate_limiter->TryUseRate(kRateFillingBytes));
-
-  // All rate consumed again.
-  EXPECT_FALSE(rate_limiter->TryUseRate(1));
-}
-
-TEST_F(RateLimitTest, DecreasingMaxRate) {
-  // Fill rate, extend window to full size.
-  EXPECT_TRUE(rate_limiter->TryUseRate(kRateFillingBytes / 2));
-  clock_.AdvanceTimeMilliseconds(kWindowSizeMs - 1);
-  EXPECT_TRUE(rate_limiter->TryUseRate(kRateFillingBytes / 2));
-
-  // All rate consumed.
-  EXPECT_FALSE(rate_limiter->TryUseRate(1));
-
-  // Halve the available rate and move window so half of the data falls out.
-  rate_limiter->SetMaxRate(kMaxRateBps / 2);
-  clock_.AdvanceTimeMilliseconds(1);
-
-  // All rate still consumed.
-  EXPECT_FALSE(rate_limiter->TryUseRate(1));
-}
-
-TEST_F(RateLimitTest, ChangingWindowSize) {
-  // Fill rate, extend window to full size.
-  EXPECT_TRUE(rate_limiter->TryUseRate(kRateFillingBytes / 2));
-  clock_.AdvanceTimeMilliseconds(kWindowSizeMs - 1);
-  EXPECT_TRUE(rate_limiter->TryUseRate(kRateFillingBytes / 2));
-
-  // All rate consumed.
-  EXPECT_FALSE(rate_limiter->TryUseRate(1));
-
-  // Decrease window size so half of the data falls out.
-  rate_limiter->SetWindowSize(kWindowSizeMs / 2);
-  // Average rate should still be the same, so rate is still all consumed.
-  EXPECT_FALSE(rate_limiter->TryUseRate(1));
-
-  // Increase window size again. Now the rate is only half used (removed data
-  // points don't come back to life).
-  rate_limiter->SetWindowSize(kWindowSizeMs);
-  EXPECT_TRUE(rate_limiter->TryUseRate(kRateFillingBytes / 2));
-
-  // All rate consumed again.
-  EXPECT_FALSE(rate_limiter->TryUseRate(1));
-}
-
-TEST_F(RateLimitTest, SingleUsageAlwaysOk) {
-  // Using more bytes than can fit in a window is OK for a single packet.
-  EXPECT_TRUE(rate_limiter->TryUseRate(kRateFillingBytes + 1));
-}
-
-TEST_F(RateLimitTest, WindowSizeLimits) {
-  EXPECT_TRUE(rate_limiter->SetWindowSize(1));
-  EXPECT_FALSE(rate_limiter->SetWindowSize(0));
-  EXPECT_TRUE(rate_limiter->SetWindowSize(kWindowSizeMs));
-  EXPECT_FALSE(rate_limiter->SetWindowSize(kWindowSizeMs + 1));
-}
-
-static const int64_t kMaxTimeoutMs = 30000;
-
-class ThreadTask {
- public:
-  explicit ThreadTask(RateLimiter* rate_limiter)
-      : rate_limiter_(rate_limiter),
-        start_signal_(false, false),
-        end_signal_(false, false) {}
-  virtual ~ThreadTask() {}
-
-  void Run() {
-    start_signal_.Wait(kMaxTimeoutMs);
-    DoRun();
-    end_signal_.Set();
-  }
-
-  virtual void DoRun() = 0;
-
-  RateLimiter* const rate_limiter_;
-  rtc::Event start_signal_;
-  rtc::Event end_signal_;
-};
-
-bool RunTask(void* thread_task) {
-  reinterpret_cast<ThreadTask*>(thread_task)->Run();
-  return false;
-}
-
-TEST_F(RateLimitTest, MultiThreadedUsage) {
-  // Simple sanity test, with different threads calling the various methods.
-  // Runs a few simple tasks, each on its own thread, but coordinated with
-  // events so that they run in a serialized order. Intended to catch data
-  // races when run with tsan et al.
-
-  // Half window size, double rate -> same amount of bytes needed to fill rate.
-
-  class SetWindowSizeTask : public ThreadTask {
-   public:
-    explicit SetWindowSizeTask(RateLimiter* rate_limiter)
-        : ThreadTask(rate_limiter) {}
-    virtual ~SetWindowSizeTask() {}
-
-    void DoRun() override {
-      EXPECT_TRUE(rate_limiter_->SetWindowSize(kWindowSizeMs / 2));
-    }
-  } set_window_size_task(rate_limiter.get());
-  rtc::PlatformThread thread1(RunTask, &set_window_size_task, "Thread1");
-  thread1.Start();
-
-  class SetMaxRateTask : public ThreadTask {
-   public:
-    explicit SetMaxRateTask(RateLimiter* rate_limiter)
-        : ThreadTask(rate_limiter) {}
-    virtual ~SetMaxRateTask() {}
-
-    void DoRun() override { rate_limiter_->SetMaxRate(kMaxRateBps * 2); }
-  } set_max_rate_task(rate_limiter.get());
-  rtc::PlatformThread thread2(RunTask, &set_max_rate_task, "Thread2");
-  thread2.Start();
-
-  class UseRateTask : public ThreadTask {
-   public:
-    UseRateTask(RateLimiter* rate_limiter, SimulatedClock* clock)
-        : ThreadTask(rate_limiter), clock_(clock) {}
-    virtual ~UseRateTask() {}
-
-    void DoRun() override {
-      EXPECT_TRUE(rate_limiter_->TryUseRate(kRateFillingBytes / 2));
-      clock_->AdvanceTimeMilliseconds((kWindowSizeMs / 2) - 1);
-      EXPECT_TRUE(rate_limiter_->TryUseRate(kRateFillingBytes / 2));
-    }
-
-    SimulatedClock* const clock_;
-  } use_rate_task(rate_limiter.get(), &clock_);
-  rtc::PlatformThread thread3(RunTask, &use_rate_task, "Thread3");
-  thread3.Start();
-
-  set_window_size_task.start_signal_.Set();
-  EXPECT_TRUE(set_window_size_task.end_signal_.Wait(kMaxTimeoutMs));
-
-  set_max_rate_task.start_signal_.Set();
-  EXPECT_TRUE(set_max_rate_task.end_signal_.Wait(kMaxTimeoutMs));
-
-  use_rate_task.start_signal_.Set();
-  EXPECT_TRUE(use_rate_task.end_signal_.Wait(kMaxTimeoutMs));
-
-  // All rate consumed.
-  EXPECT_FALSE(rate_limiter->TryUseRate(1));
-
-  thread1.Stop();
-  thread2.Stop();
-  thread3.Stop();
-}
-
-}  // namespace webrtc