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/*
* 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 "testing/gtest/include/gtest/gtest.h"
namespace webrtc {
namespace {
static const int kNumSeconds = 10;
static const int kWidth = 1920;
static const int kHalfWidth = kWidth / 2;
static const int kHeight = 1080;
static const int kFramerate = 30;
static const int kLowQp = 15;
static const int kNormalQp = 30;
static const int kMaxQp = 56;
} // namespace
class QualityScalerTest : public ::testing::Test {
protected:
enum ScaleDirection { kScaleDown, kScaleUp };
QualityScalerTest() {
input_frame_.CreateEmptyFrame(
kWidth, kHeight, kWidth, kHalfWidth, kHalfWidth);
qs_.Init(kMaxQp);
qs_.ReportFramerate(kFramerate);
}
void TriggerScale(ScaleDirection scale_direction) {
int initial_width = qs_.GetScaledResolution(input_frame_).width;
for (int i = 0; i < kFramerate * kNumSeconds; ++i) {
switch (scale_direction) {
case kScaleUp:
qs_.ReportEncodedFrame(kLowQp);
break;
case kScaleDown:
qs_.ReportDroppedFrame();
break;
}
if (qs_.GetScaledResolution(input_frame_).width != initial_width)
return;
}
FAIL() << "No downscale within " << kNumSeconds << " seconds.";
}
void ExpectOriginalFrame() {
EXPECT_EQ(&input_frame_, &qs_.GetScaledFrame(input_frame_))
<< "Using scaled frame instead of original input.";
}
void ExpectScaleUsingReportedResolution() {
QualityScaler::Resolution res = qs_.GetScaledResolution(input_frame_);
const I420VideoFrame& scaled_frame = qs_.GetScaledFrame(input_frame_);
EXPECT_EQ(res.width, scaled_frame.width());
EXPECT_EQ(res.height, scaled_frame.height());
}
void ContinuouslyDownscalesByHalfDimensionsAndBackUp();
void DoesNotDownscaleFrameDimensions(int width, int height);
QualityScaler qs_;
I420VideoFrame input_frame_;
};
TEST_F(QualityScalerTest, UsesOriginalFrameInitially) {
ExpectOriginalFrame();
}
TEST_F(QualityScalerTest, ReportsOriginalResolutionInitially) {
QualityScaler::Resolution res = qs_.GetScaledResolution(input_frame_);
EXPECT_EQ(input_frame_.width(), res.width);
EXPECT_EQ(input_frame_.height(), res.height);
}
TEST_F(QualityScalerTest, DownscalesAfterContinuousFramedrop) {
TriggerScale(kScaleDown);
QualityScaler::Resolution res = qs_.GetScaledResolution(input_frame_);
EXPECT_LT(res.width, input_frame_.width());
EXPECT_LT(res.height, input_frame_.height());
}
TEST_F(QualityScalerTest, DownscalesAfterTwoThirdsFramedrop) {
for (int i = 0; i < kFramerate * kNumSeconds / 3; ++i) {
qs_.ReportEncodedFrame(kNormalQp);
qs_.ReportDroppedFrame();
qs_.ReportDroppedFrame();
if (qs_.GetScaledResolution(input_frame_).width < input_frame_.width())
return;
}
FAIL() << "No downscale within " << kNumSeconds << " seconds.";
}
TEST_F(QualityScalerTest, DoesNotDownscaleOnNormalQp) {
for (int i = 0; i < kFramerate * kNumSeconds; ++i) {
qs_.ReportEncodedFrame(kNormalQp);
ASSERT_EQ(input_frame_.width(), qs_.GetScaledResolution(input_frame_).width)
<< "Unexpected scale on half framedrop.";
}
}
TEST_F(QualityScalerTest, DoesNotDownscaleAfterHalfFramedrop) {
for (int i = 0; i < kFramerate * kNumSeconds / 2; ++i) {
qs_.ReportEncodedFrame(kNormalQp);
ASSERT_EQ(input_frame_.width(), qs_.GetScaledResolution(input_frame_).width)
<< "Unexpected scale on half framedrop.";
qs_.ReportDroppedFrame();
ASSERT_EQ(input_frame_.width(), qs_.GetScaledResolution(input_frame_).width)
<< "Unexpected scale on half framedrop.";
}
}
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 > 16) {
TriggerScale(kScaleDown);
QualityScaler::Resolution res = qs_.GetScaledResolution(input_frame_);
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) {
TriggerScale(kScaleUp);
QualityScaler::Resolution res = qs_.GetScaledResolution(input_frame_);
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_.ReportEncodedFrame(kLowQp);
ExpectOriginalFrame();
}
}
TEST_F(QualityScalerTest, ContinuouslyDownscalesByHalfDimensionsAndBackUp) {
ContinuouslyDownscalesByHalfDimensionsAndBackUp();
}
TEST_F(QualityScalerTest,
ContinuouslyDownscalesOddResolutionsByHalfDimensionsAndBackUp) {
const int kOddWidth = 517;
const int kHalfOddWidth = (kOddWidth + 1) / 2;
const int kOddHeight = 1239;
input_frame_.CreateEmptyFrame(
kOddWidth, kOddHeight, kOddWidth, kHalfOddWidth, kHalfOddWidth);
ContinuouslyDownscalesByHalfDimensionsAndBackUp();
}
void QualityScalerTest::DoesNotDownscaleFrameDimensions(int width, int height) {
input_frame_.CreateEmptyFrame(
width, height, width, (width + 1) / 2, (width + 1) / 2);
for (int i = 0; i < kFramerate * kNumSeconds; ++i) {
qs_.ReportDroppedFrame();
ASSERT_EQ(input_frame_.width(), qs_.GetScaledResolution(input_frame_).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);
}
} // namespace webrtc
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