1 files changed, 139 insertions, 0 deletions
diff --git a/tests/fuzzer/decoder_fuzzer_frame_parallel.cc b/tests/fuzzer/decoder_fuzzer_frame_parallel.cc
new file mode 100644
index 0000000..d1b1c54
--- /dev/null
+++ b/tests/fuzzer/decoder_fuzzer_frame_parallel.cc
@@ -0,0 +1,139 @@
+// Copyright 2020 The libgav1 Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <cstddef>
+#include <cstdint>
+#include <deque>
+#include <memory>
+#include <vector>
+
+#include "examples/file_reader.h"
+#include "examples/file_reader_constants.h"
+#include "examples/file_reader_interface.h"
+#include "src/gav1/decoder.h"
+#include "src/gav1/status_code.h"
+#include "tests/fuzzer/fuzzer_temp_file.h"
+
+namespace {
+
+#if defined(LIBGAV1_EXHAUSTIVE_FUZZING)
+// Set a large upper bound to give more coverage of a single input; this value
+// should be larger than most of the frame counts in the corpus.
+constexpr size_t kMaxDataSize = 400 * 1024;
+#else
+constexpr size_t kMaxDataSize = 200 * 1024;
+#endif
+
+using InputBuffer = std::vector<uint8_t>;
+
+struct InputBuffers {
+  ~InputBuffers() {
+    for (auto& buffer : free_buffers) {
+      delete buffer;
+    }
+  }
+  std::deque<InputBuffer*> free_buffers;
+};
+
+void ReleaseInputBuffer(void* callback_private_data,
+                        void* buffer_private_data) {
+  auto* const test = static_cast<InputBuffers*>(callback_private_data);
+  test->free_buffers.push_back(static_cast<InputBuffer*>(buffer_private_data));
+}
+
+}  // namespace
+
+// Always returns 0. Nonzero return values are reserved by libFuzzer for future
+// use.
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  // Reject large chunks of data to improve fuzzer throughput.
+  if (size > kMaxDataSize) return 0;
+
+  // Note that |input_buffers| has to outlive the |decoder| object since the
+  // |release_input_buffer| callback could be called on the |decoder|'s
+  // destructor.
+  InputBuffers input_buffers;
+
+  libgav1::Decoder decoder;
+  libgav1::DecoderSettings settings = {};
+  // Use the 33 + low byte of the width to seed the number of threads. This
+  // ensures that we will trigger the frame parallel path in most cases.
+  // We use both nibbles of the lower byte as this results in values != 1 much
+  // more quickly than using the lower nibble alone.
+  settings.threads =
+      33 + ((size >= 13) ? ((data[12] >> 4 | data[12]) & 0xF) + 1 : 1);
+
+  settings.frame_parallel = true;
+  settings.blocking_dequeue = true;
+  settings.callback_private_data = &input_buffers;
+  settings.release_input_buffer = ReleaseInputBuffer;
+  if (decoder.Init(&settings) != libgav1::kStatusOk) return 0;
+
+  FuzzerTemporaryFile tempfile(data, size);
+  auto file_reader =
+      libgav1::FileReader::Open(tempfile.filename(), /*error_tolerant=*/true);
+  if (file_reader == nullptr) return 0;
+
+  InputBuffer* input_buffer = nullptr;
+  bool dequeue_finished = false;
+
+  do {
+    if (input_buffer == nullptr && !file_reader->IsEndOfFile()) {
+      if (input_buffers.free_buffers.empty()) {
+        auto* const buffer = new (std::nothrow) InputBuffer();
+        if (buffer == nullptr) {
+          break;
+        }
+        input_buffers.free_buffers.push_back(buffer);
+      }
+      input_buffer = input_buffers.free_buffers.front();
+      input_buffers.free_buffers.pop_front();
+      if (!file_reader->ReadTemporalUnit(input_buffer, nullptr)) {
+        break;
+      }
+    }
+
+    if (input_buffer != nullptr) {
+      libgav1::StatusCode status =
+          decoder.EnqueueFrame(input_buffer->data(), input_buffer->size(),
+                               /*user_private_data=*/0,
+                               /*buffer_private_data=*/input_buffer);
+      if (status == libgav1::kStatusOk) {
+        input_buffer = nullptr;
+        // Continue to enqueue frames until we get a kStatusTryAgain status.
+        continue;
+      }
+      if (status != libgav1::kStatusTryAgain) {
+        break;
+      }
+    }
+
+    const libgav1::DecoderBuffer* buffer;
+    libgav1::StatusCode status = decoder.DequeueFrame(&buffer);
+    if (status == libgav1::kStatusNothingToDequeue) {
+      dequeue_finished = true;
+    } else if (status == libgav1::kStatusOk) {
+      dequeue_finished = false;
+    } else {
+      break;
+    }
+  } while (input_buffer != nullptr || !file_reader->IsEndOfFile() ||
+           !dequeue_finished);
+
+  if (input_buffer != nullptr) {
+    input_buffers.free_buffers.push_back(input_buffer);
+  }
+
+  return 0;
+}