| // 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 "media/cast/cast_defines.h" |
| #include "media/cast/net/cast_transport_defines.h" |
| |
| namespace media { |
| namespace cast { |
| |
| class FrameIdWrapHelperTest : public ::testing::Test { |
| protected: |
| FrameIdWrapHelperTest() {} |
| ~FrameIdWrapHelperTest() override {} |
| |
| void RunOneTest(uint32 starting_point, int iterations) { |
| const int window_size = 127; |
| uint32 window_base = starting_point; |
| frame_id_wrap_helper_.largest_frame_id_seen_ = starting_point; |
| for (int i = 0; i < iterations; i++) { |
| uint32 largest_frame_id_seen = |
| frame_id_wrap_helper_.largest_frame_id_seen_; |
| int offset = rand() % window_size; |
| uint32 frame_id = window_base + offset; |
| uint32 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) { |
| EXPECT_EQ(kStartFrameId, frame_id_wrap_helper_.MapTo32bitsFrameId(255u)); |
| } |
| |
| TEST_F(FrameIdWrapHelperTest, Rollover) { |
| uint32 new_frame_id = 0u; |
| for (int i = 0; i <= 256; ++i) { |
| new_frame_id = |
| frame_id_wrap_helper_.MapTo32bitsFrameId(static_cast<uint8>(i)); |
| } |
| EXPECT_EQ(256u, new_frame_id); |
| } |
| |
| TEST_F(FrameIdWrapHelperTest, OutOfOrder) { |
| uint32 new_frame_id = 0u; |
| for (int i = 0; i < 255; ++i) { |
| new_frame_id = |
| frame_id_wrap_helper_.MapTo32bitsFrameId(static_cast<uint8>(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 |