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1 /* | |
2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. | |
3 * | |
4 * Use of this source code is governed by a BSD-style license | |
5 * that can be found in the LICENSE file in the root of the source | |
6 * tree. An additional intellectual property rights grant can be found | |
7 * in the file PATENTS. All contributing project authors may | |
8 * be found in the AUTHORS file in the root of the source tree. | |
9 */ | |
10 | |
11 #include <string.h> | |
12 | |
13 #include <memory> | |
14 #include <utility> | |
15 | |
16 #include "testing/gtest/include/gtest/gtest.h" | |
17 #include "webrtc/base/basictypes.h" | |
18 #include "webrtc/base/checks.h" | |
19 #include "webrtc/base/random.h" | |
20 #include "webrtc/base/scoped_ref_ptr.h" | |
21 #include "webrtc/modules/rtp_rtcp/source/fec_test_helper.h" | |
22 #include "webrtc/modules/rtp_rtcp/source/forward_error_correction.h" | |
23 #include "webrtc/modules/rtp_rtcp/source/forward_error_correction_internal.h" | |
24 #include "webrtc/modules/rtp_rtcp/source/ulpfec_header_reader_writer.h" | |
25 | |
26 namespace webrtc { | |
27 | |
28 namespace { | |
29 | |
30 using Packet = ::webrtc::ForwardErrorCorrection::Packet; | |
31 using ReceivedFecPacket = ::webrtc::ForwardErrorCorrection::ReceivedFecPacket; | |
32 | |
33 constexpr uint32_t kMediaSsrc = 1254983; | |
34 constexpr uint16_t kMediaStartSeqNum = 825; | |
35 constexpr size_t kMediaPacketLength = 1234; | |
36 | |
37 constexpr size_t kUlpfecHeaderSizeLBitClear = 14; | |
38 constexpr size_t kUlpfecHeaderSizeLBitSet = 18; | |
39 constexpr size_t kUlpfecPacketMaskOffset = 12; | |
40 | |
41 std::unique_ptr<uint8_t[]> GeneratePacketMask(size_t packet_mask_size, | |
42 uint64_t seed) { | |
43 Random random(seed); | |
44 std::unique_ptr<uint8_t[]> packet_mask(new uint8_t[packet_mask_size]); | |
45 for (size_t i = 0; i < packet_mask_size; ++i) { | |
46 packet_mask[i] = random.Rand<uint8_t>(); | |
47 } | |
48 return packet_mask; | |
49 } | |
50 | |
51 std::unique_ptr<Packet> WriteHeader(const uint8_t* packet_mask, | |
52 size_t packet_mask_size) { | |
53 UlpfecHeaderWriter writer; | |
54 std::unique_ptr<Packet> written_packet(new Packet()); | |
55 written_packet->length = kMediaPacketLength; | |
56 for (size_t i = 0; i < written_packet->length; ++i) { | |
57 written_packet->data[i] = i; // Actual content doesn't matter. | |
58 } | |
59 writer.FinalizeFecHeader(kMediaStartSeqNum, packet_mask, packet_mask_size, | |
60 written_packet.get()); | |
61 return written_packet; | |
62 } | |
63 | |
64 std::unique_ptr<ReceivedFecPacket> ReadHeader(const Packet& written_packet) { | |
65 UlpfecHeaderReader reader; | |
66 std::unique_ptr<ReceivedFecPacket> read_packet(new ReceivedFecPacket()); | |
67 read_packet->ssrc = kMediaSsrc; | |
68 read_packet->pkt = rtc::scoped_refptr<Packet>(new Packet()); | |
69 memcpy(read_packet->pkt->data, written_packet.data, written_packet.length); | |
70 read_packet->pkt->length = written_packet.length; | |
71 EXPECT_TRUE(reader.ReadFecHeader(read_packet.get())); | |
72 return read_packet; | |
73 } | |
74 | |
75 void VerifyHeaders(size_t expected_fec_header_size, | |
76 const uint8_t* expected_packet_mask, | |
77 size_t expected_packet_mask_size, | |
78 const Packet& written_packet, | |
79 const ReceivedFecPacket& read_packet) { | |
80 EXPECT_EQ(kMediaSsrc, read_packet.ssrc); | |
81 EXPECT_EQ(expected_fec_header_size, read_packet.fec_header_size); | |
82 EXPECT_EQ(kMediaSsrc, read_packet.protected_ssrc); | |
83 EXPECT_EQ(kMediaStartSeqNum, read_packet.seq_num_base); | |
84 EXPECT_EQ(kUlpfecPacketMaskOffset, read_packet.packet_mask_offset); | |
85 ASSERT_EQ(expected_packet_mask_size, read_packet.packet_mask_size); | |
86 EXPECT_EQ(written_packet.length - expected_fec_header_size, | |
87 read_packet.protection_length); | |
88 EXPECT_EQ(0, memcmp(expected_packet_mask, | |
89 &read_packet.pkt->data[read_packet.packet_mask_offset], | |
90 read_packet.packet_mask_size)); | |
91 // Verify that the call to ReadFecHeader did not tamper with the payload. | |
92 EXPECT_EQ(0, memcmp(&written_packet.data[expected_fec_header_size], | |
93 &read_packet.pkt->data[expected_fec_header_size], | |
94 written_packet.length - expected_fec_header_size)); | |
95 } | |
96 | |
97 } // namespace | |
98 | |
99 TEST(UlpfecHeaderReaderWriterTest, CalculateSmallHeaderSize) { | |
100 UlpfecHeaderWriter writer; | |
101 const size_t packet_mask_size = kUlpfecPacketMaskSizeLBitClear; | |
102 auto packet_mask = GeneratePacketMask(packet_mask_size, 0xabcd); | |
103 size_t min_packet_mask_size = | |
104 writer.MinPacketMaskSize(packet_mask.get(), packet_mask_size); | |
105 EXPECT_EQ(kUlpfecPacketMaskSizeLBitClear, min_packet_mask_size); | |
106 EXPECT_EQ(kUlpfecHeaderSizeLBitClear, | |
107 writer.FecHeaderSize(min_packet_mask_size)); | |
108 } | |
109 | |
110 TEST(UlpfecHeaderReaderWriterTest, CalculateLargeHeaderSize) { | |
111 UlpfecHeaderWriter writer; | |
112 const size_t packet_mask_size = kUlpfecPacketMaskSizeLBitSet; | |
113 auto packet_mask = GeneratePacketMask(packet_mask_size, 0xabcd); | |
114 size_t min_packet_mask_size = | |
115 writer.MinPacketMaskSize(packet_mask.get(), packet_mask_size); | |
116 EXPECT_EQ(kUlpfecPacketMaskSizeLBitSet, min_packet_mask_size); | |
117 EXPECT_EQ(kUlpfecHeaderSizeLBitSet, | |
118 writer.FecHeaderSize(min_packet_mask_size)); | |
119 } | |
120 | |
121 TEST(UlpfecHeaderReaderWriterTest, WriteAndReadSmallHeader) { | |
122 const size_t packet_mask_size = kUlpfecPacketMaskSizeLBitClear; | |
123 auto packet_mask = GeneratePacketMask(packet_mask_size, 0xabcd); | |
124 auto written_packet = WriteHeader(packet_mask.get(), packet_mask_size); | |
125 auto read_packet = ReadHeader(*written_packet); | |
126 VerifyHeaders(kUlpfecHeaderSizeLBitClear, packet_mask.get(), packet_mask_size, | |
127 *written_packet, *read_packet); | |
128 } | |
129 | |
130 TEST(UlpfecHeaderReaderWriterTest, WriteAndReadLargeHeader) { | |
131 const size_t packet_mask_size = kUlpfecPacketMaskSizeLBitSet; | |
132 auto packet_mask = GeneratePacketMask(packet_mask_size, 0xabcd); | |
133 auto written_packet = WriteHeader(packet_mask.get(), packet_mask_size); | |
134 auto read_packet = ReadHeader(*written_packet); | |
135 VerifyHeaders(kUlpfecHeaderSizeLBitSet, packet_mask.get(), packet_mask_size, | |
136 *written_packet, *read_packet); | |
137 } | |
stefan-webrtc
2016/09/13 08:49:34
Maybe add one test where you have a small "correct
brandtr
2016/09/14 11:45:41
Done.
| |
138 | |
139 } // namespace webrtc | |
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