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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <gtest/gtest.h>
#include <stdint.h>
#include "base/macros.h"
#include "media/cast/constants.h"
#include "media/cast/net/cast_transport_defines.h"
namespace media {
namespace cast {
class FrameIdWrapHelperTest : public ::testing::Test {
protected:
FrameIdWrapHelperTest() : frame_id_wrap_helper_(kFirstFrameId - 1) {}
~FrameIdWrapHelperTest() override {}
void RunOneTest(uint32_t starting_point, int iterations) {
const int window_size = 127;
uint32_t window_base = starting_point;
frame_id_wrap_helper_.largest_frame_id_seen_ = starting_point;
for (int i = 0; i < iterations; i++) {
uint32_t largest_frame_id_seen =
frame_id_wrap_helper_.largest_frame_id_seen_;
int offset = rand() % window_size;
uint32_t frame_id = window_base + offset;
uint32_t mapped_frame_id =
frame_id_wrap_helper_.MapTo32bitsFrameId(frame_id & 0xff);
EXPECT_EQ(frame_id, mapped_frame_id)
<< " Largest ID seen: " << largest_frame_id_seen
<< " Window base: " << window_base
<< " Offset: " << offset;
window_base = frame_id;
}
}
FrameIdWrapHelper frame_id_wrap_helper_;
DISALLOW_COPY_AND_ASSIGN(FrameIdWrapHelperTest);
};
TEST_F(FrameIdWrapHelperTest, FirstFrame) {
uint32_t expected_frame_id = kFirstFrameId;
EXPECT_EQ(expected_frame_id, frame_id_wrap_helper_.MapTo32bitsFrameId(0u));
--expected_frame_id;
EXPECT_EQ(expected_frame_id, frame_id_wrap_helper_.MapTo32bitsFrameId(255u));
}
TEST_F(FrameIdWrapHelperTest, Rollover) {
uint32_t new_frame_id = 0u;
for (int i = 0; i <= 256; ++i) {
new_frame_id =
frame_id_wrap_helper_.MapTo32bitsFrameId(static_cast<uint8_t>(i));
}
EXPECT_EQ(256u, new_frame_id);
}
TEST_F(FrameIdWrapHelperTest, OutOfOrder) {
uint32_t new_frame_id = 0u;
for (int i = 0; i < 255; ++i) {
new_frame_id =
frame_id_wrap_helper_.MapTo32bitsFrameId(static_cast<uint8_t>(i));
}
EXPECT_EQ(254u, new_frame_id);
new_frame_id = frame_id_wrap_helper_.MapTo32bitsFrameId(0u);
EXPECT_EQ(256u, new_frame_id);
new_frame_id = frame_id_wrap_helper_.MapTo32bitsFrameId(255u);
EXPECT_EQ(255u, new_frame_id);
new_frame_id = frame_id_wrap_helper_.MapTo32bitsFrameId(1u);
EXPECT_EQ(257u, new_frame_id);
}
TEST_F(FrameIdWrapHelperTest, Windowed) {
srand(0);
for (int i = 0; i < 50000 && !HasFailure(); i++) {
RunOneTest(i * 4711, 20);
// Test wrap-around scenarios.
RunOneTest(0x7fffff00ul, 20);
RunOneTest(0xffffff00ul, 20);
}
}
} // namespace cast
} // namespace media
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