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/*
* 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 "modules/video_coding/histogram.h"
#include "test/gtest.h"
namespace webrtc {
namespace video_coding {
class TestHistogram : public ::testing::Test {
protected:
TestHistogram() : histogram_(5, 10) {}
Histogram histogram_;
};
TEST_F(TestHistogram, NumValues) {
EXPECT_EQ(0ul, histogram_.NumValues());
histogram_.Add(0);
EXPECT_EQ(1ul, histogram_.NumValues());
}
TEST_F(TestHistogram, InverseCdf) {
histogram_.Add(0);
histogram_.Add(1);
histogram_.Add(2);
histogram_.Add(3);
histogram_.Add(4);
EXPECT_EQ(5ul, histogram_.NumValues());
EXPECT_EQ(1ul, histogram_.InverseCdf(0.2f));
EXPECT_EQ(2ul, histogram_.InverseCdf(0.2000001f));
EXPECT_EQ(4ul, histogram_.InverseCdf(0.8f));
histogram_.Add(0);
EXPECT_EQ(6ul, histogram_.NumValues());
EXPECT_EQ(1ul, histogram_.InverseCdf(0.2f));
EXPECT_EQ(1ul, histogram_.InverseCdf(0.2000001f));
}
TEST_F(TestHistogram, ReplaceOldValues) {
histogram_.Add(0);
histogram_.Add(0);
histogram_.Add(0);
histogram_.Add(0);
histogram_.Add(0);
histogram_.Add(1);
histogram_.Add(1);
histogram_.Add(1);
histogram_.Add(1);
histogram_.Add(1);
EXPECT_EQ(10ul, histogram_.NumValues());
EXPECT_EQ(1ul, histogram_.InverseCdf(0.5f));
EXPECT_EQ(2ul, histogram_.InverseCdf(0.5000001f));
histogram_.Add(4);
histogram_.Add(4);
histogram_.Add(4);
histogram_.Add(4);
EXPECT_EQ(10ul, histogram_.NumValues());
EXPECT_EQ(1ul, histogram_.InverseCdf(0.1f));
EXPECT_EQ(2ul, histogram_.InverseCdf(0.5f));
histogram_.Add(20);
EXPECT_EQ(10ul, histogram_.NumValues());
EXPECT_EQ(2ul, histogram_.InverseCdf(0.5f));
EXPECT_EQ(5ul, histogram_.InverseCdf(0.5000001f));
}
} // namespace video_coding
} // namespace webrtc
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