Move usage of QualityScaler to ViEEncoder.

webrtc/modules/video_coding/utility/quality_scaler_unittest.cc

 /*
  *  Copyright (c) 2014 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/modules/video_coding/utility/quality_scaler.h"
 
+#include <memory>
+
+#include "webrtc/base/event.h"
+#include "webrtc/base/task_queue.h"
+#include "webrtc/test/gmock.h"
 #include "webrtc/test/gtest.h"
 
 namespace webrtc {
 namespace {
-static const int kNumSeconds = 10;
-static const int kWidth = 1920;
-static const int kHeight = 1080;
 static const int kFramerate = 30;
 static const int kLowQp = 15;
-static const int kNormalQp = 30;
 static const int kLowQpThreshold = 18;
 static const int kHighQp = 40;
-static const int kDisabledBadQpThreshold = 64;
-static const int kLowInitialBitrateKbps = 300;
-// These values need to be in sync with corresponding constants
-// in quality_scaler.cc
-static const int kMeasureSecondsFastUpscale = 2;
-static const int kMeasureSecondsUpscale = 5;
-static const int kMeasureSecondsDownscale = 5;
-static const int kMinDownscaleDimension = 140;
+static const size_t kDefaultTimeoutMs = 1000;
 }  // namespace
 
+class MockScaleObserver : public ScalingObserverInterface {
+ public:
+  MockScaleObserver() : event(false, false) {}
+  virtual ~MockScaleObserver() {}
+
+  void ScaleUp(ScaleReason r) override {
+    scaled_up++;
+    event.Set();
+  }
+  void ScaleDown(ScaleReason r) override {
+    scaled_down++;
+    event.Set();
+  }
+
+  rtc::Event event;
+  int scaled_up = 0;
+  int scaled_down = 0;
+};
+
+// Pass a lower sampling period to speed up the tests.
+class QualityScalerUnderTest : public QualityScaler {
+ public:
+  explicit QualityScalerUnderTest(ScalingObserverInterface* observer,
+                                  VideoEncoder::QpThresholds thresholds)
+      : QualityScaler(observer, thresholds, 5) {}
+};
+
 class QualityScalerTest : public ::testing::Test {
  protected:
   enum ScaleDirection {
     kKeepScaleAtHighQp,
     kScaleDown,
     kScaleDownAboveHighQp,
     kScaleUp
   };
 
-  QualityScalerTest() {
-    input_frame_ = I420Buffer::Create(kWidth, kHeight);
-    qs_.Init(kLowQpThreshold, kHighQp, 0, kWidth, kHeight, kFramerate);
-    qs_.OnEncodeFrame(input_frame_->width(), input_frame_->height());
+  QualityScalerTest()
+      : q_(new rtc::TaskQueue("QualityScalerTestQueue")),
+        observer_(new MockScaleObserver()) {
+    rtc::Event event(false, false);
+    q_->PostTask([this, &event] {
+      qs_ = std::unique_ptr<QualityScaler>(new QualityScalerUnderTest(
+          observer_.get(),
+          VideoEncoder::QpThresholds(kLowQpThreshold, kHighQp)));
+      event.Set();
+    });
+    EXPECT_TRUE(event.Wait(kDefaultTimeoutMs));
   }
 
-  bool TriggerScale(ScaleDirection scale_direction) {
-    qs_.OnEncodeFrame(input_frame_->width(), input_frame_->height());
-    int initial_width = qs_.GetScaledResolution().width;
-    for (int i = 0; i < kFramerate * kNumSeconds; ++i) {
+  ~QualityScalerTest() {
+    rtc::Event event(false, false);
+    q_->PostTask([this, &event] {
+      qs_.reset(nullptr);
+      event.Set();
+    });
+    EXPECT_TRUE(event.Wait(kDefaultTimeoutMs));
+  }
+
+  void TriggerScale(ScaleDirection scale_direction) {
+    for (int i = 0; i < kFramerate * 5; ++i) {
       switch (scale_direction) {
         case kScaleUp:
-          qs_.ReportQP(kLowQp);
+          qs_->ReportQP(kLowQp);
           break;
         case kScaleDown:
-          qs_.ReportDroppedFrame();
+          qs_->ReportDroppedFrame();
           break;
         case kKeepScaleAtHighQp:
-          qs_.ReportQP(kHighQp);
+          qs_->ReportQP(kHighQp);
           break;
         case kScaleDownAboveHighQp:
-          qs_.ReportQP(kHighQp + 1);
+          qs_->ReportQP(kHighQp + 1);
           break;
       }
-      qs_.OnEncodeFrame(input_frame_->width(), input_frame_->height());
-      if (qs_.GetScaledResolution().width != initial_width)
-        return true;
     }
-
-    return false;
   }
 
-  void ExpectOriginalFrame() {
-    EXPECT_EQ(input_frame_, qs_.GetScaledBuffer(input_frame_))
-        << "Using scaled frame instead of original input.";
-  }
-
-  void ExpectScaleUsingReportedResolution() {
-    qs_.OnEncodeFrame(input_frame_->width(), input_frame_->height());
-    QualityScaler::Resolution res = qs_.GetScaledResolution();
-    rtc::scoped_refptr<VideoFrameBuffer> scaled_frame =
-        qs_.GetScaledBuffer(input_frame_);
-    EXPECT_EQ(res.width, scaled_frame->width());
-    EXPECT_EQ(res.height, scaled_frame->height());
-  }
-
-  void ContinuouslyDownscalesByHalfDimensionsAndBackUp();
-
-  void DoesNotDownscaleFrameDimensions(int width, int height);
-
-  void DownscaleEndsAt(int input_width,
-                       int input_height,
-                       int end_width,
-                       int end_height);
-
-  QualityScaler qs_;
-  rtc::scoped_refptr<VideoFrameBuffer> input_frame_;
+  std::unique_ptr<rtc::TaskQueue> q_;
+  std::unique_ptr<QualityScaler> qs_;
+  std::unique_ptr<MockScaleObserver> observer_;
 };
 
-TEST_F(QualityScalerTest, UsesOriginalFrameInitially) {
-  ExpectOriginalFrame();
-}
-
-TEST_F(QualityScalerTest, ReportsOriginalResolutionInitially) {
-  qs_.OnEncodeFrame(input_frame_->width(), input_frame_->height());
-  QualityScaler::Resolution res = qs_.GetScaledResolution();
-  EXPECT_EQ(input_frame_->width(), res.width);
-  EXPECT_EQ(input_frame_->height(), res.height);
-}
-
 TEST_F(QualityScalerTest, DownscalesAfterContinuousFramedrop) {
-  EXPECT_TRUE(TriggerScale(kScaleDown)) << "No downscale within " << kNumSeconds
-                                        << " seconds.";
-  QualityScaler::Resolution res = qs_.GetScaledResolution();
-  EXPECT_LT(res.width, input_frame_->width());
-  EXPECT_LT(res.height, input_frame_->height());
+  q_->PostTask([this] { TriggerScale(kScaleDown); });
+  EXPECT_TRUE(observer_->event.Wait(50));
+  EXPECT_EQ(1, observer_->scaled_down);
 }
 
 TEST_F(QualityScalerTest, KeepsScaleAtHighQp) {
-  EXPECT_FALSE(TriggerScale(kKeepScaleAtHighQp))
-      << "Downscale at high threshold which should keep scale.";
-  QualityScaler::Resolution res = qs_.GetScaledResolution();
-  EXPECT_EQ(res.width, input_frame_->width());
-  EXPECT_EQ(res.height, input_frame_->height());
+  q_->PostTask([this] { TriggerScale(kKeepScaleAtHighQp); });
+  EXPECT_FALSE(observer_->event.Wait(50));
+  EXPECT_EQ(0, observer_->scaled_down);
+  EXPECT_EQ(0, observer_->scaled_up);
 }
 
 TEST_F(QualityScalerTest, DownscalesAboveHighQp) {
-  EXPECT_TRUE(TriggerScale(kScaleDownAboveHighQp))
-      << "No downscale within " << kNumSeconds << " seconds.";
-  QualityScaler::Resolution res = qs_.GetScaledResolution();
-  EXPECT_LT(res.width, input_frame_->width());
-  EXPECT_LT(res.height, input_frame_->height());
+  q_->PostTask([this] { TriggerScale(kScaleDownAboveHighQp); });
+  EXPECT_TRUE(observer_->event.Wait(50));
+  EXPECT_EQ(1, observer_->scaled_down);
+  EXPECT_EQ(0, observer_->scaled_up);
 }
 
 TEST_F(QualityScalerTest, DownscalesAfterTwoThirdsFramedrop) {
-  for (int i = 0; i < kFramerate * kNumSeconds / 3; ++i) {
-    qs_.ReportQP(kNormalQp);
-    qs_.ReportDroppedFrame();
-    qs_.ReportDroppedFrame();
-    qs_.OnEncodeFrame(input_frame_->width(), input_frame_->height());
-    if (qs_.GetScaledResolution().width < input_frame_->width())
-      return;
-  }
-
-  FAIL() << "No downscale within " << kNumSeconds << " seconds.";
+  q_->PostTask([this] {
+    qs_->ReportDroppedFrame();
+    qs_->ReportDroppedFrame();
+    qs_->ReportQP(kHighQp);
+  });
+  EXPECT_TRUE(observer_->event.Wait(50));
+  EXPECT_EQ(1, observer_->scaled_down);
+  EXPECT_EQ(0, observer_->scaled_up);
 }
 
 TEST_F(QualityScalerTest, DoesNotDownscaleOnNormalQp) {
-  for (int i = 0; i < kFramerate * kNumSeconds; ++i) {
-    qs_.ReportQP(kNormalQp);
-    qs_.OnEncodeFrame(input_frame_->width(), input_frame_->height());
-    ASSERT_EQ(input_frame_->width(), qs_.GetScaledResolution().width)
-        << "Unexpected scale on half framedrop.";
-  }
+  q_->PostTask([this] { TriggerScale(kScaleDownAboveHighQp); });
+  EXPECT_TRUE(observer_->event.Wait(50));
+  EXPECT_EQ(1, observer_->scaled_down);
+  EXPECT_EQ(0, observer_->scaled_up);
 }
 
 TEST_F(QualityScalerTest, DoesNotDownscaleAfterHalfFramedrop) {
-  for (int i = 0; i < kFramerate * kNumSeconds / 2; ++i) {
-    qs_.ReportQP(kNormalQp);
-    qs_.OnEncodeFrame(input_frame_->width(), input_frame_->height());
-    ASSERT_EQ(input_frame_->width(), qs_.GetScaledResolution().width)
-        << "Unexpected scale on half framedrop.";
-
-    qs_.ReportDroppedFrame();
-    qs_.OnEncodeFrame(input_frame_->width(), input_frame_->height());
-    ASSERT_EQ(input_frame_->width(), qs_.GetScaledResolution().width)
-        << "Unexpected scale on half framedrop.";
-  }
+  q_->PostTask([this] {
+    qs_->ReportDroppedFrame();
+    qs_->ReportQP(kHighQp);
+  });
+  EXPECT_FALSE(observer_->event.Wait(50));
+  EXPECT_EQ(0, observer_->scaled_down);
+  EXPECT_EQ(0, observer_->scaled_up);
 }
 
-void QualityScalerTest::ContinuouslyDownscalesByHalfDimensionsAndBackUp() {
-  const int initial_min_dimension =
-      input_frame_->width() < input_frame_->height() ? input_frame_->width()
-                                                     : input_frame_->height();
-  int min_dimension = initial_min_dimension;
-  int current_shift = 0;
-  // Drop all frames to force-trigger downscaling.
-  while (min_dimension >= 2 * kMinDownscaleDimension) {
-    EXPECT_TRUE(TriggerScale(kScaleDown)) << "No downscale within "
-                                          << kNumSeconds << " seconds.";
-    qs_.OnEncodeFrame(input_frame_->width(), input_frame_->height());
-    QualityScaler::Resolution res = qs_.GetScaledResolution();
-    min_dimension = res.width < res.height ? res.width : res.height;
-    ++current_shift;
-    ASSERT_EQ(input_frame_->width() >> current_shift, res.width);
-    ASSERT_EQ(input_frame_->height() >> current_shift, res.height);
-    ExpectScaleUsingReportedResolution();
-  }
-
-  // Make sure we can scale back with good-quality frames.
-  while (min_dimension < initial_min_dimension) {
-    EXPECT_TRUE(TriggerScale(kScaleUp)) << "No upscale within " << kNumSeconds
-                                        << " seconds.";
-    qs_.OnEncodeFrame(input_frame_->width(), input_frame_->height());
-    QualityScaler::Resolution res = qs_.GetScaledResolution();
-    min_dimension = res.width < res.height ? res.width : res.height;
-    --current_shift;
-    ASSERT_EQ(input_frame_->width() >> current_shift, res.width);
-    ASSERT_EQ(input_frame_->height() >> current_shift, res.height);
-    ExpectScaleUsingReportedResolution();
-  }
-
-  // Verify we don't start upscaling after further low use.
-  for (int i = 0; i < kFramerate * kNumSeconds; ++i) {
-    qs_.ReportQP(kLowQp);
-    ExpectOriginalFrame();
-  }
+TEST_F(QualityScalerTest, UpscalesAfterLowQp) {
+  q_->PostTask([this] { TriggerScale(kScaleUp); });
+  EXPECT_TRUE(observer_->event.Wait(50));
+  EXPECT_EQ(0, observer_->scaled_down);
+  EXPECT_EQ(1, observer_->scaled_up);
 }
 
-TEST_F(QualityScalerTest, ContinuouslyDownscalesByHalfDimensionsAndBackUp) {
-  ContinuouslyDownscalesByHalfDimensionsAndBackUp();
-}
-
-TEST_F(QualityScalerTest,
-       ContinuouslyDownscalesOddResolutionsByHalfDimensionsAndBackUp) {
-  const int kOddWidth = 517;
-  const int kOddHeight = 1239;
-  input_frame_ = I420Buffer::Create(kOddWidth, kOddHeight);
-  ContinuouslyDownscalesByHalfDimensionsAndBackUp();
-}
-
-void QualityScalerTest::DoesNotDownscaleFrameDimensions(int width, int height) {
-  input_frame_ = I420Buffer::Create(width, height);
-
-  for (int i = 0; i < kFramerate * kNumSeconds; ++i) {
-    qs_.ReportDroppedFrame();
-    qs_.OnEncodeFrame(input_frame_->width(), input_frame_->height());
-    ASSERT_EQ(input_frame_->width(), qs_.GetScaledResolution().width)
-        << "Unexpected scale of minimal-size frame.";
-  }
-}
-
-TEST_F(QualityScalerTest, DoesNotDownscaleFrom1PxWidth) {
-  DoesNotDownscaleFrameDimensions(1, kHeight);
-}
-
-TEST_F(QualityScalerTest, DoesNotDownscaleFrom1PxHeight) {
-  DoesNotDownscaleFrameDimensions(kWidth, 1);
-}
-
-TEST_F(QualityScalerTest, DoesNotDownscaleFrom1Px) {
-  DoesNotDownscaleFrameDimensions(1, 1);
-}
-
-TEST_F(QualityScalerTest, DoesNotDownscaleBelow2xDefaultMinDimensionsWidth) {
-  DoesNotDownscaleFrameDimensions(
-      2 * kMinDownscaleDimension - 1, 1000);
-}
-
-TEST_F(QualityScalerTest, DoesNotDownscaleBelow2xDefaultMinDimensionsHeight) {
-  DoesNotDownscaleFrameDimensions(
-      1000, 2 * kMinDownscaleDimension - 1);
-}
-
-TEST_F(QualityScalerTest, DownscaleToVgaOnLowInitialBitrate) {
-  static const int kWidth720p = 1280;
-  static const int kHeight720p = 720;
-  static const int kInitialBitrateKbps = 300;
-  input_frame_ = I420Buffer::Create(kWidth720p, kHeight720p);
-  qs_.Init(kLowQpThreshold, kDisabledBadQpThreshold, kInitialBitrateKbps,
-           kWidth720p, kHeight720p, kFramerate);
-  qs_.OnEncodeFrame(input_frame_->width(), input_frame_->height());
-  int init_width = qs_.GetScaledResolution().width;
-  int init_height = qs_.GetScaledResolution().height;
-  EXPECT_EQ(640, init_width);
-  EXPECT_EQ(360, init_height);
-}
-
-TEST_F(QualityScalerTest, DownscaleToQvgaOnLowerInitialBitrate) {
-  static const int kWidth720p = 1280;
-  static const int kHeight720p = 720;
-  static const int kInitialBitrateKbps = 200;
-  input_frame_ = I420Buffer::Create(kWidth720p, kHeight720p);
-  qs_.Init(kLowQpThreshold, kDisabledBadQpThreshold, kInitialBitrateKbps,
-           kWidth720p, kHeight720p, kFramerate);
-  qs_.OnEncodeFrame(input_frame_->width(), input_frame_->height());
-  int init_width = qs_.GetScaledResolution().width;
-  int init_height = qs_.GetScaledResolution().height;
-  EXPECT_EQ(320, init_width);
-  EXPECT_EQ(180, init_height);
-}
-
-TEST_F(QualityScalerTest, DownscaleAfterMeasuredSecondsThenSlowerBackUp) {
-  qs_.Init(kLowQpThreshold, kHighQp, 0, kWidth, kHeight, kFramerate);
-  qs_.OnEncodeFrame(input_frame_->width(), input_frame_->height());
-  QualityScaler::Resolution initial_res = qs_.GetScaledResolution();
-
-  // Should not downscale if less than kMeasureSecondsDownscale seconds passed.
-  for (int i = 0; i < kFramerate * kMeasureSecondsDownscale - 1; ++i) {
-    qs_.ReportQP(kHighQp + 1);
-    qs_.OnEncodeFrame(input_frame_->width(), input_frame_->height());
-  }
-  EXPECT_EQ(initial_res.width, qs_.GetScaledResolution().width);
-  EXPECT_EQ(initial_res.height, qs_.GetScaledResolution().height);
-
-  // Should downscale if more than kMeasureSecondsDownscale seconds passed (add
-  // last frame).
-  qs_.ReportQP(kHighQp + 1);
-  qs_.OnEncodeFrame(input_frame_->width(), input_frame_->height());
-  EXPECT_GT(initial_res.width, qs_.GetScaledResolution().width);
-  EXPECT_GT(initial_res.height, qs_.GetScaledResolution().height);
-
-  // Should not upscale if less than kMeasureSecondsUpscale seconds passed since
-  // we saw issues initially (have already gone down).
-  for (int i = 0; i < kFramerate * kMeasureSecondsUpscale - 1; ++i) {
-    qs_.ReportQP(kLowQp);
-    qs_.OnEncodeFrame(input_frame_->width(), input_frame_->height());
-  }
-  EXPECT_GT(initial_res.width, qs_.GetScaledResolution().width);
-  EXPECT_GT(initial_res.height, qs_.GetScaledResolution().height);
-
-  // Should upscale (back to initial) if kMeasureSecondsUpscale seconds passed
-  // (add last frame).
-  qs_.ReportQP(kLowQp);
-  qs_.OnEncodeFrame(input_frame_->width(), input_frame_->height());
-  EXPECT_EQ(initial_res.width, qs_.GetScaledResolution().width);
-  EXPECT_EQ(initial_res.height, qs_.GetScaledResolution().height);
-}
-
-TEST_F(QualityScalerTest, UpscaleQuicklyInitiallyAfterMeasuredSeconds) {
-  qs_.Init(kLowQpThreshold, kHighQp, kLowInitialBitrateKbps, kWidth, kHeight,
-           kFramerate);
-  qs_.OnEncodeFrame(input_frame_->width(), input_frame_->height());
-  QualityScaler::Resolution initial_res = qs_.GetScaledResolution();
-
-  // Should not upscale if less than kMeasureSecondsFastUpscale seconds passed.
-  for (int i = 0; i < kFramerate * kMeasureSecondsFastUpscale - 1; ++i) {
-    qs_.ReportQP(kLowQp);
-    qs_.OnEncodeFrame(input_frame_->width(), input_frame_->height());
-  }
-  EXPECT_EQ(initial_res.width, qs_.GetScaledResolution().width);
-  EXPECT_EQ(initial_res.height, qs_.GetScaledResolution().height);
-
-  // Should upscale if kMeasureSecondsFastUpscale seconds passed (add last
-  // frame).
-  qs_.ReportQP(kLowQp);
-  qs_.OnEncodeFrame(input_frame_->width(), input_frame_->height());
-  EXPECT_LT(initial_res.width, qs_.GetScaledResolution().width);
-  EXPECT_LT(initial_res.height, qs_.GetScaledResolution().height);
-}
-
-void QualityScalerTest::DownscaleEndsAt(int input_width,
-                                        int input_height,
-                                        int end_width,
-                                        int end_height) {
-  // Create a frame with 2x expected end width/height to verify that we can
-  // scale down to expected end width/height.
-  input_frame_ = I420Buffer::Create(input_width, input_height);
-
-  int last_width = input_width;
-  int last_height = input_height;
-  // Drop all frames to force-trigger downscaling.
-  while (true) {
-    TriggerScale(kScaleDown);
-    QualityScaler::Resolution res = qs_.GetScaledResolution();
-    if (last_width == res.width) {
-      EXPECT_EQ(last_height, res.height);
-      EXPECT_EQ(end_width, res.width);
-      EXPECT_EQ(end_height, res.height);
-      break;
-    }
-    last_width = res.width;
-    last_height = res.height;
-  }
-}
-
-TEST_F(QualityScalerTest, DownscalesTo320x180) {
-  DownscaleEndsAt(640, 360, 320, 180);
-}
-
-TEST_F(QualityScalerTest, DownscalesTo180x320) {
-  DownscaleEndsAt(360, 640, 180, 320);
-}
-
-TEST_F(QualityScalerTest, DownscalesFrom1280x720To320x180) {
-  DownscaleEndsAt(1280, 720, 320, 180);
-}
-
-TEST_F(QualityScalerTest, DoesntDownscaleInitialQvga) {
-  DownscaleEndsAt(320, 180, 320, 180);
+TEST_F(QualityScalerTest, ScalesDownAndBackUp) {
+  q_->PostTask([this] { TriggerScale(kScaleDown); });
+  EXPECT_TRUE(observer_->event.Wait(50));
+  EXPECT_EQ(1, observer_->scaled_down);
+  EXPECT_EQ(0, observer_->scaled_up);
+  q_->PostTask([this] { TriggerScale(kScaleUp); });
+  EXPECT_TRUE(observer_->event.Wait(50));
+  EXPECT_EQ(1, observer_->scaled_down);
+  EXPECT_EQ(1, observer_->scaled_up);
 }
 
 }  // namespace webrtc