Bitrate controller for VideoToolbox encoder.

webrtc/modules/remote_bitrate_estimator/rate_statistics_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.
- */
-
-#include "testing/gtest/include/gtest/gtest.h"
-#include "webrtc/modules/remote_bitrate_estimator/rate_statistics.h"
-
-namespace {
-
-using webrtc::RateStatistics;
-
-class RateStatisticsTest : public ::testing::Test {
- protected:
-  RateStatisticsTest() : stats_(500, 8000) {}
-  RateStatistics stats_;
-};
-
-TEST_F(RateStatisticsTest, TestStrictMode) {
-  int64_t now_ms = 0;
-  // Should be initialized to 0.
-  EXPECT_EQ(0u, stats_.Rate(now_ms));
-  stats_.Update(1500, now_ms);
-  // Expecting 24 kbps given a 500 ms window with one 1500 bytes packet.
-  EXPECT_EQ(24000u, stats_.Rate(now_ms));
-  stats_.Reset();
-  // Expecting 0 after init.
-  EXPECT_EQ(0u, stats_.Rate(now_ms));
-  for (int i = 0; i < 100000; ++i) {
-    if (now_ms % 10 == 0) {
-      stats_.Update(1500, now_ms);
-    }
-    // Approximately 1200 kbps expected. Not exact since when packets
-    // are removed we will jump 10 ms to the next packet.
-    if (now_ms > 0 && now_ms % 500 == 0) {
-      EXPECT_NEAR(1200000u, stats_.Rate(now_ms), 24000u);
-    }
-    now_ms += 1;
-  }
-  now_ms += 500;
-  // The window is 2 seconds. If nothing has been received for that time
-  // the estimate should be 0.
-  EXPECT_EQ(0u, stats_.Rate(now_ms));
-}
-
-TEST_F(RateStatisticsTest, IncreasingThenDecreasingBitrate) {
-  int64_t now_ms = 0;
-  stats_.Reset();
-  // Expecting 0 after init.
-  uint32_t bitrate = stats_.Rate(now_ms);
-  EXPECT_EQ(0u, bitrate);
-  // 1000 bytes per millisecond until plateau is reached.
-  while (++now_ms < 10000) {
-    stats_.Update(1000, now_ms);
-    uint32_t new_bitrate = stats_.Rate(now_ms);
-    if (new_bitrate != bitrate) {
-      // New bitrate must be higher than previous one.
-      EXPECT_GT(new_bitrate, bitrate);
-    } else {
-      // Plateau reached, 8000 kbps expected.
-      EXPECT_NEAR(8000000u, bitrate, 80000u);
-      break;
-    }
-    bitrate = new_bitrate;
-  }
-  // 1000 bytes per millisecond until 10-second mark, 8000 kbps expected.
-  while (++now_ms < 10000) {
-    stats_.Update(1000, now_ms);
-    bitrate = stats_.Rate(now_ms);
-    EXPECT_NEAR(8000000u, bitrate, 80000u);
-  }
-  // Zero bytes per millisecond until 0 is reached.
-  while (++now_ms < 20000) {
-    stats_.Update(0, now_ms);
-    uint32_t new_bitrate = stats_.Rate(now_ms);
-    if (new_bitrate != bitrate) {
-      // New bitrate must be lower than previous one.
-      EXPECT_LT(new_bitrate, bitrate);
-    } else {
-      // 0 kbps expected.
-      EXPECT_EQ(0u, bitrate);
-      break;
-    }
-    bitrate = new_bitrate;
-  }
-  // Zero bytes per millisecond until 20-second mark, 0 kbps expected.
-  while (++now_ms < 20000) {
-    stats_.Update(0, now_ms);
-    EXPECT_EQ(0u, stats_.Rate(now_ms));
-  }
-}
-}  // namespace