1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include <gtest/gtest.h> 6 #include "media/cast/cast_defines.h" 7 #include "media/cast/net/cast_transport_defines.h" 8 9 namespace media { 10 namespace cast { 11 12 class FrameIdWrapHelperTest : public ::testing::Test { 13 protected: 14 FrameIdWrapHelperTest() {} 15 virtual ~FrameIdWrapHelperTest() {} 16 17 void RunOneTest(uint32 starting_point, int iterations) { 18 const int window_size = 127; 19 uint32 window_base = starting_point; 20 frame_id_wrap_helper_.largest_frame_id_seen_ = starting_point; 21 for (int i = 0; i < iterations; i++) { 22 uint32 largest_frame_id_seen = 23 frame_id_wrap_helper_.largest_frame_id_seen_; 24 int offset = rand() % window_size; 25 uint32 frame_id = window_base + offset; 26 uint32 mapped_frame_id = 27 frame_id_wrap_helper_.MapTo32bitsFrameId(frame_id & 0xff); 28 EXPECT_EQ(frame_id, mapped_frame_id) 29 << " Largest ID seen: " << largest_frame_id_seen 30 << " Window base: " << window_base 31 << " Offset: " << offset; 32 window_base = frame_id; 33 } 34 } 35 36 FrameIdWrapHelper frame_id_wrap_helper_; 37 38 DISALLOW_COPY_AND_ASSIGN(FrameIdWrapHelperTest); 39 }; 40 41 TEST_F(FrameIdWrapHelperTest, FirstFrame) { 42 EXPECT_EQ(kStartFrameId, frame_id_wrap_helper_.MapTo32bitsFrameId(255u)); 43 } 44 45 TEST_F(FrameIdWrapHelperTest, Rollover) { 46 uint32 new_frame_id = 0u; 47 for (int i = 0; i <= 256; ++i) { 48 new_frame_id = 49 frame_id_wrap_helper_.MapTo32bitsFrameId(static_cast<uint8>(i)); 50 } 51 EXPECT_EQ(256u, new_frame_id); 52 } 53 54 TEST_F(FrameIdWrapHelperTest, OutOfOrder) { 55 uint32 new_frame_id = 0u; 56 for (int i = 0; i < 255; ++i) { 57 new_frame_id = 58 frame_id_wrap_helper_.MapTo32bitsFrameId(static_cast<uint8>(i)); 59 } 60 EXPECT_EQ(254u, new_frame_id); 61 new_frame_id = frame_id_wrap_helper_.MapTo32bitsFrameId(0u); 62 EXPECT_EQ(256u, new_frame_id); 63 new_frame_id = frame_id_wrap_helper_.MapTo32bitsFrameId(255u); 64 EXPECT_EQ(255u, new_frame_id); 65 new_frame_id = frame_id_wrap_helper_.MapTo32bitsFrameId(1u); 66 EXPECT_EQ(257u, new_frame_id); 67 } 68 69 TEST_F(FrameIdWrapHelperTest, Windowed) { 70 srand(0); 71 for (int i = 0; i < 50000 && !HasFailure(); i++) { 72 RunOneTest(i * 4711, 20); 73 // Test wrap-around scenarios. 74 RunOneTest(0x7fffff00ul, 20); 75 RunOneTest(0xffffff00ul, 20); 76 } 77 } 78 79 } // namespace cast 80 } // namespace media 81