1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
|
/*
* Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <memory>
#include "api/rtp_packet_infos.h"
#include "modules/video_coding/frame_object.h"
#include "modules/video_coding/rtp_frame_reference_finder.h"
namespace webrtc {
namespace {
class DataReader {
public:
DataReader(const uint8_t* data, size_t size) : data_(data), size_(size) {}
template <typename T>
void CopyTo(T* object) {
static_assert(std::is_pod<T>(), "");
uint8_t* destination = reinterpret_cast<uint8_t*>(object);
size_t object_size = sizeof(T);
size_t num_bytes = std::min(size_ - offset_, object_size);
memcpy(destination, data_ + offset_, num_bytes);
offset_ += num_bytes;
// If we did not have enough data, fill the rest with 0.
object_size -= num_bytes;
memset(destination + num_bytes, 0, object_size);
}
template <typename T>
T GetNum() {
T res;
if (offset_ + sizeof(res) < size_) {
memcpy(&res, data_ + offset_, sizeof(res));
offset_ += sizeof(res);
return res;
}
offset_ = size_;
return T(0);
}
bool MoreToRead() { return offset_ < size_; }
private:
const uint8_t* data_;
size_t size_;
size_t offset_ = 0;
};
absl::optional<RTPVideoHeader::GenericDescriptorInfo>
GenerateGenericFrameDependencies(DataReader* reader) {
absl::optional<RTPVideoHeader::GenericDescriptorInfo> result;
uint8_t flags = reader->GetNum<uint8_t>();
if (flags & 0b1000'0000) {
// i.e. with 50% chance there are no generic dependencies.
// in such case codec-specfic code path of the RtpFrameReferenceFinder will
// be validated.
return result;
}
result.emplace();
result->frame_id = reader->GetNum<int32_t>();
result->spatial_index = (flags & 0b0111'0000) >> 4;
result->temporal_index = (flags & 0b0000'1110) >> 1;
// Larger than supported by the RtpFrameReferenceFinder.
int num_diffs = (reader->GetNum<uint8_t>() % 16);
for (int i = 0; i < num_diffs; ++i) {
result->dependencies.push_back(result->frame_id -
(reader->GetNum<uint16_t>() % (1 << 14)));
}
return result;
}
} // namespace
void FuzzOneInput(const uint8_t* data, size_t size) {
DataReader reader(data, size);
RtpFrameReferenceFinder reference_finder;
auto codec = static_cast<VideoCodecType>(reader.GetNum<uint8_t>() % 5);
while (reader.MoreToRead()) {
uint16_t first_seq_num = reader.GetNum<uint16_t>();
uint16_t last_seq_num = reader.GetNum<uint16_t>();
bool marker_bit = reader.GetNum<uint8_t>();
RTPVideoHeader video_header;
switch (reader.GetNum<uint8_t>() % 3) {
case 0:
video_header.frame_type = VideoFrameType::kEmptyFrame;
break;
case 1:
video_header.frame_type = VideoFrameType::kVideoFrameKey;
break;
case 2:
video_header.frame_type = VideoFrameType::kVideoFrameDelta;
break;
}
switch (codec) {
case kVideoCodecVP8:
reader.CopyTo(
&video_header.video_type_header.emplace<RTPVideoHeaderVP8>());
break;
case kVideoCodecVP9:
reader.CopyTo(
&video_header.video_type_header.emplace<RTPVideoHeaderVP9>());
break;
case kVideoCodecH264:
reader.CopyTo(
&video_header.video_type_header.emplace<RTPVideoHeaderH264>());
break;
default:
break;
}
video_header.generic = GenerateGenericFrameDependencies(&reader);
// clang-format off
auto frame = std::make_unique<RtpFrameObject>(
first_seq_num,
last_seq_num,
marker_bit,
/*times_nacked=*/0,
/*first_packet_received_time=*/0,
/*last_packet_received_time=*/0,
/*rtp_timestamp=*/0,
/*ntp_time_ms=*/0,
VideoSendTiming(),
/*payload_type=*/0,
codec,
kVideoRotation_0,
VideoContentType::UNSPECIFIED,
video_header,
/*color_space=*/absl::nullopt,
RtpPacketInfos(),
EncodedImageBuffer::Create(/*size=*/0));
// clang-format on
reference_finder.ManageFrame(std::move(frame));
}
}
} // namespace webrtc
|
