1 files changed, 201 insertions, 0 deletions
diff --git a/third_party/libwebrtc/test/fuzzers/neteq_signal_fuzzer.cc b/third_party/libwebrtc/test/fuzzers/neteq_signal_fuzzer.cc
new file mode 100644
index 0000000000..8653f137a2
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+++ b/third_party/libwebrtc/test/fuzzers/neteq_signal_fuzzer.cc
@@ -0,0 +1,201 @@
+/*
+ *  Copyright (c) 2017 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 <cmath>
+#include <limits>
+#include <memory>
+#include <vector>
+
+#include "api/array_view.h"
+#include "api/audio_codecs/builtin_audio_decoder_factory.h"
+#include "modules/audio_coding/codecs/pcm16b/audio_encoder_pcm16b.h"
+#include "modules/audio_coding/neteq/tools/audio_checksum.h"
+#include "modules/audio_coding/neteq/tools/encode_neteq_input.h"
+#include "modules/audio_coding/neteq/tools/neteq_test.h"
+#include "rtc_base/numerics/safe_conversions.h"
+#include "rtc_base/random.h"
+#include "test/fuzzers/fuzz_data_helper.h"
+
+namespace webrtc {
+namespace test {
+namespace {
+// Generate a mixture of sine wave and gaussian noise.
+class SineAndNoiseGenerator : public EncodeNetEqInput::Generator {
+ public:
+  // The noise generator is seeded with a value from the fuzzer data, but 0 is
+  // avoided (since it is not allowed by the Random class).
+  SineAndNoiseGenerator(int sample_rate_hz, FuzzDataHelper* fuzz_data)
+      : sample_rate_hz_(sample_rate_hz),
+        fuzz_data_(*fuzz_data),
+        noise_generator_(fuzz_data_.ReadOrDefaultValueNotZero<uint64_t>(1)) {}
+
+  // Generates num_samples of the sine-gaussian mixture.
+  rtc::ArrayView<const int16_t> Generate(size_t num_samples) override {
+    if (samples_.size() < num_samples) {
+      samples_.resize(num_samples);
+    }
+
+    rtc::ArrayView<int16_t> output(samples_.data(), num_samples);
+    // Randomize an amplitude between 0 and 32768; use 65000/2 if we are out of
+    // fuzzer data.
+    const float amplitude = fuzz_data_.ReadOrDefaultValue<uint16_t>(65000) / 2;
+    // Randomize a noise standard deviation between 0 and 1999.
+    const float noise_std = fuzz_data_.ReadOrDefaultValue<uint16_t>(0) % 2000;
+    for (auto& x : output) {
+      x = rtc::saturated_cast<int16_t>(amplitude * std::sin(phase_) +
+                                       noise_generator_.Gaussian(0, noise_std));
+      phase_ += 2 * kPi * kFreqHz / sample_rate_hz_;
+    }
+    return output;
+  }
+
+ private:
+  static constexpr int kFreqHz = 300;  // The sinewave frequency.
+  const int sample_rate_hz_;
+  const double kPi = std::acos(-1);
+  std::vector<int16_t> samples_;
+  double phase_ = 0.0;
+  FuzzDataHelper& fuzz_data_;
+  Random noise_generator_;
+};
+
+class FuzzSignalInput : public NetEqInput {
+ public:
+  explicit FuzzSignalInput(FuzzDataHelper* fuzz_data,
+                           int sample_rate,
+                           uint8_t payload_type)
+      : fuzz_data_(*fuzz_data) {
+    AudioEncoderPcm16B::Config config;
+    config.payload_type = payload_type;
+    config.sample_rate_hz = sample_rate;
+    std::unique_ptr<AudioEncoder> encoder(new AudioEncoderPcm16B(config));
+    std::unique_ptr<EncodeNetEqInput::Generator> generator(
+        new SineAndNoiseGenerator(config.sample_rate_hz, fuzz_data));
+    input_.reset(new EncodeNetEqInput(std::move(generator), std::move(encoder),
+                                      std::numeric_limits<int64_t>::max()));
+    packet_ = input_->PopPacket();
+
+    // Select an output event period. This is how long time we wait between each
+    // call to NetEq::GetAudio. 10 ms is nominal, 9 and 11 ms will both lead to
+    // clock drift (in different directions).
+    constexpr int output_event_periods[] = {9, 10, 11};
+    output_event_period_ms_ = fuzz_data_.SelectOneOf(output_event_periods);
+  }
+
+  absl::optional<int64_t> NextPacketTime() const override {
+    return packet_->time_ms;
+  }
+
+  absl::optional<int64_t> NextOutputEventTime() const override {
+    return next_output_event_ms_;
+  }
+
+  std::unique_ptr<PacketData> PopPacket() override {
+    RTC_DCHECK(packet_);
+    std::unique_ptr<PacketData> packet_to_return = std::move(packet_);
+    do {
+      packet_ = input_->PopPacket();
+      // If the next value from the fuzzer input is 0, the packet is discarded
+      // and the next one is pulled from the source.
+    } while (fuzz_data_.CanReadBytes(1) && fuzz_data_.Read<uint8_t>() == 0);
+    if (fuzz_data_.CanReadBytes(1)) {
+      // Generate jitter by setting an offset for the arrival time.
+      const int8_t arrival_time_offset_ms = fuzz_data_.Read<int8_t>();
+      // The arrival time can not be before the previous packets.
+      packet_->time_ms = std::max(packet_to_return->time_ms,
+                                  packet_->time_ms + arrival_time_offset_ms);
+    } else {
+      // Mark that we are at the end of the test. However, the current packet is
+      // still valid (but it may not have been fuzzed as expected).
+      ended_ = true;
+    }
+    return packet_to_return;
+  }
+
+  void AdvanceOutputEvent() override {
+    next_output_event_ms_ += output_event_period_ms_;
+  }
+
+  bool ended() const override { return ended_; }
+
+  absl::optional<RTPHeader> NextHeader() const override {
+    RTC_DCHECK(packet_);
+    return packet_->header;
+  }
+
+ private:
+  bool ended_ = false;
+  FuzzDataHelper& fuzz_data_;
+  std::unique_ptr<EncodeNetEqInput> input_;
+  std::unique_ptr<PacketData> packet_;
+  int64_t next_output_event_ms_ = 0;
+  int64_t output_event_period_ms_ = 10;
+};
+
+template <class T>
+bool MapHas(const std::map<int, T>& m, int key, const T& value) {
+  const auto it = m.find(key);
+  return (it != m.end() && it->second == value);
+}
+
+}  // namespace
+
+void FuzzOneInputTest(const uint8_t* data, size_t size) {
+  if (size < 1 || size > 65000) {
+    return;
+  }
+
+  FuzzDataHelper fuzz_data(rtc::ArrayView<const uint8_t>(data, size));
+
+  // Allowed sample rates and payload types used in the test.
+  std::pair<int, uint8_t> rate_types[] = {
+      {8000, 93}, {16000, 94}, {32000, 95}, {48000, 96}};
+  const auto rate_type = fuzz_data.SelectOneOf(rate_types);
+  const int sample_rate = rate_type.first;
+  const uint8_t payload_type = rate_type.second;
+
+  // Set up the input signal generator.
+  std::unique_ptr<FuzzSignalInput> input(
+      new FuzzSignalInput(&fuzz_data, sample_rate, payload_type));
+
+  // Output sink for the test.
+  std::unique_ptr<AudioChecksum> output(new AudioChecksum);
+
+  // Configure NetEq and the NetEqTest object.
+  NetEqTest::Callbacks callbacks;
+  NetEq::Config config;
+  config.enable_post_decode_vad = true;
+  config.enable_fast_accelerate = true;
+  auto codecs = NetEqTest::StandardDecoderMap();
+  // rate_types contains the payload types that will be used for encoding.
+  // Verify that they all are included in the standard decoder map, and that
+  // they point to the expected decoder types.
+  RTC_CHECK(
+      MapHas(codecs, rate_types[0].second, SdpAudioFormat("l16", 8000, 1)));
+  RTC_CHECK(
+      MapHas(codecs, rate_types[1].second, SdpAudioFormat("l16", 16000, 1)));
+  RTC_CHECK(
+      MapHas(codecs, rate_types[2].second, SdpAudioFormat("l16", 32000, 1)));
+  RTC_CHECK(
+      MapHas(codecs, rate_types[3].second, SdpAudioFormat("l16", 48000, 1)));
+
+  NetEqTest test(config, CreateBuiltinAudioDecoderFactory(), codecs,
+                 /*text_log=*/nullptr, /*neteq_factory=*/nullptr,
+                 std::move(input), std::move(output), callbacks);
+  test.Run();
+}
+
+}  // namespace test
+
+void FuzzOneInput(const uint8_t* data, size_t size) {
+  test::FuzzOneInputTest(data, size);
+}
+
+}  // namespace webrtc