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      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