chromium/media/gpu/hrd_buffer_unittest.cc

// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif

#include "media/gpu/hrd_buffer.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace media {
namespace {
constexpr int kCommonFps = …;
constexpr base::TimeDelta kCommonBufferDelay = …;
constexpr uint32_t kCommonAvgBitrate = …;   // bits per second
constexpr uint32_t kCommonPeakBitrate = …;  // bits per second

// Test HRDBufferTest runs the test frame size sequence in various
// scenarios and check whether the component behaves as expected.
class HRDBufferTest : public testing::Test { … };

// Test Cases

// Running a simple sequence of frames and taking a snapshot of the parameters
// after the last frame is added. The parameters must strictly satisfy the
// predefined state.
TEST_F(HRDBufferTest, RunBasicBufferTest) { … }

// The test runs the predefined test sequence three times using different buffer
// parameters. A snapshot of the buffer state is taken after each sequence
// run. The snapshot must strictly satisfy the predefined state.
TEST_F(HRDBufferTest, CheckBufferParameterChange) { … }

// The test uses extended HRD buffer constructor which initiates the buffer
// internal state with the provided parameters. After running the first test
// sequence, a new buffer is created with predefined state and another sequence
// is run after that. A snapshot of the buffer state is checked stirictly
// against predefined values after each sequence run.
TEST_F(HRDBufferTest, CheckSettingBufferState) { … }

// Checks the last frame timestamp parameter after a frame is added to the
// buffer.
TEST_F(HRDBufferTest, CheckBufferLastFrameTimestamp) { … }

// Checks the buffer fullness parameter when the size of the buffer is being
// reduced. The size should follow strictly the predefined buffer size values.
TEST_F(HRDBufferTest, CheckBufferShrinking) { … }

// Checks the buffer overshoot condition. After running the test frame sequence
// the buffer should overshoot at the predefined frame index.
TEST_F(HRDBufferTest, CheckBufferOvershoot) { … }

}  // namespace
}  // namespace media