// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <stddef.h>
#include <stdint.h>
#include <string.h>

#include <memory>

#include "base/at_exit.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/files/file_util.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/numerics/safe_conversions.h"
#include "base/path_service.h"
#include "base/stl_util.h"
#include "base/strings/string_split.h"
#include "base/strings/stringprintf.h"
#include "base/threading/thread.h"
#include "base/threading/thread_task_runner_handle.h"
#include "base/timer/elapsed_timer.h"
#include "build/build_config.h"
#include "components/chromeos_camera/gpu_mjpeg_decode_accelerator_factory.h"
#include "components/chromeos_camera/mjpeg_decode_accelerator.h"
#include "media/base/test_data_util.h"
#include "media/gpu/buildflags.h"
#include "media/gpu/test/video_accelerator_unittest_helpers.h"
#include "media/parsers/jpeg_parser.h"
#include "mojo/core/embedder/embedder.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/libyuv/include/libyuv.h"
#include "ui/gfx/codec/jpeg_codec.h"
#include "ui/gfx/codec/png_codec.h"

#if BUILDFLAG(USE_VAAPI)
#include "media/gpu/vaapi/vaapi_wrapper.h"
#endif

namespace chromeos_camera {
namespace {

// Default test image file.
const base::FilePath::CharType* kDefaultJpegFilename =
    FILE_PATH_LITERAL("peach_pi-1280x720.jpg");
constexpr int kDefaultPerfDecodeTimes = 600;
// Decide to save decode results to files or not. Output files will be saved
// in the same directory with unittest. File name is like input file but
// changing the extension to "yuv".
bool g_save_to_file = false;
// Threshold for mean absolute difference of hardware and software decode.
// Absolute difference is to calculate the difference between each pixel in two
// images. This is used for measuring of the similarity of two images.
constexpr double kDecodeSimilarityThreshold = 1.25;

// Environment to create test data for all test cases.
class MjpegDecodeAcceleratorTestEnvironment;
MjpegDecodeAcceleratorTestEnvironment* g_env;

// This struct holds a parsed, complete JPEG blob. It can be created from a
// FilePath or can be simply a black image.
struct ParsedJpegImage {
  static std::unique_ptr<ParsedJpegImage> CreateFromFile(
      const base::FilePath& file_path) {
    auto image = std::make_unique<ParsedJpegImage>(file_path);

    LOG_ASSERT(base::ReadFileToString(file_path, &image->data_str))
        << file_path;

    media::JpegParseResult parse_result;
    LOG_ASSERT(ParseJpegPicture(
        reinterpret_cast<const uint8_t*>(image->data_str.data()),
        image->data_str.size(), &parse_result));

    image->InitializeSizes(parse_result.frame_header.visible_width,
                           parse_result.frame_header.visible_height);
    return image;
  }

  static std::unique_ptr<ParsedJpegImage> CreateBlackImage(
      int width,
      int height,
      SkJpegEncoder::Downsample downsample = SkJpegEncoder::Downsample::k420) {
    // Generate a black image with the specified resolution.
    constexpr size_t kBytesPerPixel = 4;
    const std::vector<unsigned char> input_buffer(width * height *
                                                  kBytesPerPixel);
    const SkImageInfo info = SkImageInfo::Make(
        width, height, kRGBA_8888_SkColorType, kOpaque_SkAlphaType);
    const SkPixmap src(info, input_buffer.data(), width * kBytesPerPixel);

    // Encode the generated image in the JPEG format, the output buffer will be
    // automatically resized while encoding.
    constexpr int kJpegQuality = 100;
    std::vector<unsigned char> encoded;
    LOG_ASSERT(gfx::JPEGCodec::Encode(src, kJpegQuality, downsample, &encoded));

    base::FilePath filename;
    LOG_ASSERT(base::GetTempDir(&filename));
    filename =
        filename.Append(base::StringPrintf("black-%dx%d.jpg", width, height));

    auto image = std::make_unique<ParsedJpegImage>(filename);
    image->data_str.append(encoded.begin(), encoded.end());
    image->InitializeSizes(width, height);
    return image;
  }

  explicit ParsedJpegImage(const base::FilePath& path) : file_path(path) {}

  void InitializeSizes(int width, int height) {
    visible_size.SetSize(width, height);
    // We don't expect odd dimensions for camera captures.
    DCHECK_EQ(0, width % 2);
    DCHECK_EQ(0, height % 2);

    coded_size.SetSize((visible_size.width() + 1) & ~1,
                       (visible_size.height() + 1) & ~1);
    // The JPEG decoder will always return the decoded frame in I420 format.
    output_size =
        media::VideoFrame::AllocationSize(media::PIXEL_FORMAT_I420, coded_size);
  }

  const base::FilePath::StringType& filename() const {
    return file_path.value();
  }

  const base::FilePath file_path;

  std::string data_str;
  gfx::Size visible_size;
  gfx::Size coded_size;
  size_t output_size;
};

// Global singleton to hold on to common data and other user-defined options.
class MjpegDecodeAcceleratorTestEnvironment : public ::testing::Environment {
 public:
  MjpegDecodeAcceleratorTestEnvironment(
      const base::FilePath::CharType* jpeg_filenames,
      const base::FilePath::CharType* test_data_path,
      int perf_decode_times)
      : perf_decode_times_(perf_decode_times ? perf_decode_times
                                             : kDefaultPerfDecodeTimes),
        user_jpeg_filenames_(jpeg_filenames ? jpeg_filenames
                                            : kDefaultJpegFilename),
        test_data_path_(test_data_path) {}

  void SetUp() override;

  // Resolve the specified file path. The file path can be either an absolute
  // path, relative to the current directory, or relative to the test data path.
  // This is either a custom test data path provided by --test_data_path, or the
  // default test data path (//media/test/data).
  base::FilePath GetOriginalOrTestDataFilePath(const std::string& file_path) {
    const base::FilePath original_file_path = base::FilePath(file_path);
    if (base::PathExists(original_file_path))
      return original_file_path;
    if (test_data_path_)
      return base::FilePath(test_data_path_).Append(original_file_path);
    return media::GetTestDataFilePath(file_path);
  }

  // Used for InputSizeChange test case. The image size should be smaller than
  // |kDefaultJpegFilename|.
  std::unique_ptr<ParsedJpegImage> image_data_1280x720_black_;
  // Used for ResolutionChange test case.
  std::unique_ptr<ParsedJpegImage> image_data_640x368_black_;
  // Used for testing some drivers which will align the output resolution to a
  // multiple of 16. 640x360 will be aligned to 640x368.
  std::unique_ptr<ParsedJpegImage> image_data_640x360_black_;
  // Generated black image used to test different JPEG sampling formats.
  std::unique_ptr<ParsedJpegImage> image_data_640x368_422_black_;
  // Parsed data of "peach_pi-1280x720.jpg".
  std::unique_ptr<ParsedJpegImage> image_data_1280x720_default_;
  // Parsed data of failure image.
  std::unique_ptr<ParsedJpegImage> image_data_invalid_;
  // Parsed data from command line.
  std::vector<std::unique_ptr<ParsedJpegImage>> image_data_user_;
  // Decode times for performance measurement.
  int perf_decode_times_;

 private:
  const base::FilePath::CharType* user_jpeg_filenames_;
  const base::FilePath::CharType* test_data_path_;
};

void MjpegDecodeAcceleratorTestEnvironment::SetUp() {
  image_data_1280x720_black_ = ParsedJpegImage::CreateBlackImage(1280, 720);
  image_data_640x368_black_ = ParsedJpegImage::CreateBlackImage(640, 368);
  image_data_640x360_black_ = ParsedJpegImage::CreateBlackImage(640, 360);
  image_data_640x368_422_black_ = ParsedJpegImage::CreateBlackImage(
      640, 368, SkJpegEncoder::Downsample::k422);

  image_data_1280x720_default_ = ParsedJpegImage::CreateFromFile(
      GetOriginalOrTestDataFilePath(kDefaultJpegFilename));

  image_data_invalid_ =
      std::make_unique<ParsedJpegImage>(base::FilePath("failure.jpg"));
  image_data_invalid_->data_str.resize(100, 0);
  image_data_invalid_->InitializeSizes(1280, 720);

  // |user_jpeg_filenames_| may include many files and use ';' as delimiter.
  std::vector<base::FilePath::StringType> filenames = base::SplitString(
      user_jpeg_filenames_, base::FilePath::StringType(1, ';'),
      base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
  for (const auto& filename : filenames) {
    const base::FilePath input_file = GetOriginalOrTestDataFilePath(filename);
    auto image_data = ParsedJpegImage::CreateFromFile(input_file);
    image_data_user_.push_back(std::move(image_data));
  }
}

enum ClientState {
  CS_CREATED,
  CS_INITIALIZED,
  CS_DECODE_PASS,
  CS_ERROR,
};

class JpegClient : public MjpegDecodeAccelerator::Client {
 public:
  // JpegClient takes ownership of |note|.
  JpegClient(
      const std::vector<ParsedJpegImage*>& test_image_files,
      std::unique_ptr<media::test::ClientStateNotification<ClientState>> note,
      bool is_skip);
  ~JpegClient() override;
  void CreateJpegDecoder();
  void StartDecode(int32_t bitstream_buffer_id, bool do_prepare_memory = true);
  void PrepareMemory(int32_t bitstream_buffer_id);
  bool GetSoftwareDecodeResult(int32_t bitstream_buffer_id);

  // MjpegDecodeAccelerator::Client implementation.
  void VideoFrameReady(int32_t bitstream_buffer_id) override;
  void NotifyError(int32_t bitstream_buffer_id,
                   MjpegDecodeAccelerator::Error error) override;

  // Accessors.
  media::test::ClientStateNotification<ClientState>* note() const {
    return note_.get();
  }

 private:
  FRIEND_TEST_ALL_PREFIXES(JpegClientTest, GetMeanAbsoluteDifference);

  void SetState(ClientState new_state);

  // Save a video frame that contains a decoded JPEG. The output is a PNG file.
  // The suffix will be added before the .png extension.
  void SaveToFile(int32_t bitstream_buffer_id,
                  scoped_refptr<media::VideoFrame> in_frame,
                  const std::string& suffix = "");

  // Calculate mean absolute difference of hardware and software decode results
  // to check the similarity.
  double GetMeanAbsoluteDifference();

  // JpegClient doesn't own |test_image_files_|.
  const std::vector<ParsedJpegImage*>& test_image_files_;

  ClientState state_;

  // Used to notify another thread about the state. JpegClient owns this.
  std::unique_ptr<media::test::ClientStateNotification<ClientState>> note_;

  // Skip JDA decode result. Used for testing performance.
  bool is_skip_;

  // Mapped memory of input file.
  base::UnsafeSharedMemoryRegion in_shm_;
  base::WritableSharedMemoryMapping in_shm_mapping_;
  // Mapped memory of output buffer from hardware decoder.
  std::unique_ptr<base::SharedMemory> hw_out_shm_;
  // Video frame corresponding to the output of the hardware decoder.
  scoped_refptr<media::VideoFrame> hw_out_frame_;
  // Mapped memory of output buffer from software decoder.
  std::unique_ptr<base::SharedMemory> sw_out_shm_;
  // Video frame corresponding to the output of the software decoder.
  scoped_refptr<media::VideoFrame> sw_out_frame_;

  // This should be the first member to get destroyed because |decoder_|
  // potentially uses other members in the JpegClient instance. For example,
  // as decode tasks finish in a new thread spawned by |decoder_|, |hw_out_shm_|
  // can be accessed.
  std::unique_ptr<MjpegDecodeAccelerator> decoder_;

  DISALLOW_COPY_AND_ASSIGN(JpegClient);
};

JpegClient::JpegClient(
    const std::vector<ParsedJpegImage*>& test_image_files,
    std::unique_ptr<media::test::ClientStateNotification<ClientState>> note,
    bool is_skip)
    : test_image_files_(test_image_files),
      state_(CS_CREATED),
      note_(std::move(note)),
      is_skip_(is_skip) {}

JpegClient::~JpegClient() {}

void JpegClient::CreateJpegDecoder() {
  decoder_ = nullptr;

  auto jda_factories =
      GpuMjpegDecodeAcceleratorFactory::GetAcceleratorFactories();
  if (jda_factories.empty()) {
    LOG(ERROR) << "MjpegDecodeAccelerator not supported on this platform.";
    SetState(CS_ERROR);
    return;
  }

  for (const auto& create_jda_func : jda_factories) {
    decoder_ = create_jda_func.Run(base::ThreadTaskRunnerHandle::Get());
    if (decoder_)
      break;
  }
  if (!decoder_) {
    LOG(ERROR) << "Failed to create MjpegDecodeAccelerator.";
    SetState(CS_ERROR);
    return;
  }

  if (!decoder_->Initialize(this)) {
    LOG(ERROR) << "MjpegDecodeAccelerator::Initialize() failed";
    SetState(CS_ERROR);
    return;
  }
  SetState(CS_INITIALIZED);
}

void JpegClient::VideoFrameReady(int32_t bitstream_buffer_id) {
  if (is_skip_) {
    SetState(CS_DECODE_PASS);
    return;
  }

  if (!GetSoftwareDecodeResult(bitstream_buffer_id)) {
    SetState(CS_ERROR);
    return;
  }
  if (g_save_to_file) {
    SaveToFile(bitstream_buffer_id, hw_out_frame_, "_hw");
    SaveToFile(bitstream_buffer_id, sw_out_frame_, "_sw");
  }

  double difference = GetMeanAbsoluteDifference();
  if (difference <= kDecodeSimilarityThreshold) {
    SetState(CS_DECODE_PASS);
  } else {
    LOG(ERROR) << "The mean absolute difference between software and hardware "
               << "decode is " << difference;
    SetState(CS_ERROR);
  }
}

void JpegClient::NotifyError(int32_t bitstream_buffer_id,
                             MjpegDecodeAccelerator::Error error) {
  LOG(ERROR) << "Notifying of error " << error << " for buffer id "
             << bitstream_buffer_id;
  SetState(CS_ERROR);
}

void JpegClient::PrepareMemory(int32_t bitstream_buffer_id) {
  ParsedJpegImage* image_file = test_image_files_[bitstream_buffer_id];

  size_t input_size = image_file->data_str.size();
  if (!in_shm_mapping_.IsValid() || input_size > in_shm_mapping_.size()) {
    in_shm_ = base::UnsafeSharedMemoryRegion::Create(input_size);
    in_shm_mapping_ = in_shm_.Map();
    LOG_ASSERT(in_shm_mapping_.IsValid());
  }
  memcpy(in_shm_mapping_.memory(), image_file->data_str.data(), input_size);

  if (!hw_out_shm_.get() ||
      image_file->output_size > hw_out_shm_->mapped_size()) {
    hw_out_shm_.reset(new base::SharedMemory);
    LOG_ASSERT(hw_out_shm_->CreateAndMapAnonymous(image_file->output_size));
  }
  memset(hw_out_shm_->memory(), 0, image_file->output_size);

  if (!sw_out_shm_.get() ||
      image_file->output_size > sw_out_shm_->mapped_size()) {
    sw_out_shm_.reset(new base::SharedMemory);
    LOG_ASSERT(sw_out_shm_->CreateAndMapAnonymous(image_file->output_size));
  }
  memset(sw_out_shm_->memory(), 0, image_file->output_size);
}

void JpegClient::SetState(ClientState new_state) {
  DVLOG(2) << "Changing state " << state_ << "->" << new_state;
  note_->Notify(new_state);
  state_ = new_state;
}

void JpegClient::SaveToFile(int32_t bitstream_buffer_id,
                            scoped_refptr<media::VideoFrame> in_frame,
                            const std::string& suffix) {
  LOG_ASSERT(in_frame);
  ParsedJpegImage* image_file = test_image_files_[bitstream_buffer_id];

  // First convert to ARGB format. Note that in our case, the coded size and the
  // visible size will be the same.
  scoped_refptr<media::VideoFrame> argb_out_frame =
      media::VideoFrame::CreateFrame(
          media::VideoPixelFormat::PIXEL_FORMAT_ARGB, image_file->visible_size,
          gfx::Rect(image_file->visible_size), image_file->visible_size,
          base::TimeDelta());
  LOG_ASSERT(argb_out_frame);
  LOG_ASSERT(in_frame->visible_rect() == argb_out_frame->visible_rect());

  // Note that we use J420ToARGB instead of I420ToARGB so that the
  // kYuvJPEGConstants YUV-to-RGB conversion matrix is used.
  const int conversion_status =
      libyuv::J420ToARGB(in_frame->data(media::VideoFrame::kYPlane),
                         in_frame->stride(media::VideoFrame::kYPlane),
                         in_frame->data(media::VideoFrame::kUPlane),
                         in_frame->stride(media::VideoFrame::kUPlane),
                         in_frame->data(media::VideoFrame::kVPlane),
                         in_frame->stride(media::VideoFrame::kVPlane),
                         argb_out_frame->data(media::VideoFrame::kARGBPlane),
                         argb_out_frame->stride(media::VideoFrame::kARGBPlane),
                         argb_out_frame->visible_rect().width(),
                         argb_out_frame->visible_rect().height());
  LOG_ASSERT(conversion_status == 0);

  // Save as a PNG.
  std::vector<uint8_t> png_output;
  const bool png_encode_status = gfx::PNGCodec::Encode(
      argb_out_frame->data(media::VideoFrame::kARGBPlane),
      gfx::PNGCodec::FORMAT_BGRA, argb_out_frame->visible_rect().size(),
      argb_out_frame->stride(media::VideoFrame::kARGBPlane),
      true, /* discard_transparency */
      std::vector<gfx::PNGCodec::Comment>(), &png_output);
  LOG_ASSERT(png_encode_status);
  const base::FilePath in_filename(image_file->filename());
  const base::FilePath out_filename =
      in_filename.ReplaceExtension(".png").InsertBeforeExtension(suffix);
  const int size = base::checked_cast<int>(png_output.size());
  const int file_written_bytes = base::WriteFile(
      out_filename, reinterpret_cast<char*>(png_output.data()), size);
  LOG_ASSERT(file_written_bytes == size);
}

double JpegClient::GetMeanAbsoluteDifference() {
  double mean_abs_difference = 0;
  size_t num_samples = 0;
  const size_t planes[] = {media::VideoFrame::kYPlane,
                           media::VideoFrame::kUPlane,
                           media::VideoFrame::kVPlane};
  for (size_t plane : planes) {
    const uint8_t* hw_data = hw_out_frame_->data(plane);
    const uint8_t* sw_data = sw_out_frame_->data(plane);
    LOG_ASSERT(hw_out_frame_->visible_rect() == sw_out_frame_->visible_rect());
    const size_t rows =
        media::VideoFrame::Rows(plane, media::PIXEL_FORMAT_I420,
                                hw_out_frame_->visible_rect().height());
    const size_t columns = media::VideoFrame::Columns(
        plane, media::PIXEL_FORMAT_I420, hw_out_frame_->visible_rect().width());
    LOG_ASSERT(hw_out_frame_->stride(plane) == sw_out_frame_->stride(plane));
    const int stride = hw_out_frame_->stride(plane);
    for (size_t row = 0; row < rows; ++row) {
      for (size_t col = 0; col < columns; ++col)
        mean_abs_difference += std::abs(hw_data[col] - sw_data[col]);
      hw_data += stride;
      sw_data += stride;
    }
    num_samples += rows * columns;
  }
  LOG_ASSERT(num_samples > 0);
  mean_abs_difference /= num_samples;
  return mean_abs_difference;
}

void JpegClient::StartDecode(int32_t bitstream_buffer_id,
                             bool do_prepare_memory) {
  DCHECK_LT(static_cast<size_t>(bitstream_buffer_id), test_image_files_.size());
  ParsedJpegImage* image_file = test_image_files_[bitstream_buffer_id];

  if (do_prepare_memory)
    PrepareMemory(bitstream_buffer_id);

  auto dup_region = base::UnsafeSharedMemoryRegion::TakeHandleForSerialization(
      in_shm_.Duplicate());
  media::BitstreamBuffer bitstream_buffer(
      bitstream_buffer_id, std::move(dup_region), image_file->data_str.size());

  hw_out_frame_ = media::VideoFrame::WrapExternalSharedMemory(
      media::PIXEL_FORMAT_I420, image_file->coded_size,
      gfx::Rect(image_file->visible_size), image_file->visible_size,
      static_cast<uint8_t*>(hw_out_shm_->memory()), image_file->output_size,
      hw_out_shm_->handle(), 0, base::TimeDelta());
  LOG_ASSERT(hw_out_frame_.get());

  decoder_->Decode(std::move(bitstream_buffer), hw_out_frame_);
}

bool JpegClient::GetSoftwareDecodeResult(int32_t bitstream_buffer_id) {
  ParsedJpegImage* image_file = test_image_files_[bitstream_buffer_id];
  sw_out_frame_ = media::VideoFrame::WrapExternalSharedMemory(
      media::PIXEL_FORMAT_I420, image_file->coded_size,
      gfx::Rect(image_file->visible_size), image_file->visible_size,
      static_cast<uint8_t*>(sw_out_shm_->memory()), image_file->output_size,
      sw_out_shm_->handle(), 0, base::TimeDelta());
  LOG_ASSERT(sw_out_shm_.get());

  if (libyuv::ConvertToI420(static_cast<uint8_t*>(in_shm_mapping_.memory()),
                            image_file->data_str.size(),
                            sw_out_frame_->data(media::VideoFrame::kYPlane),
                            sw_out_frame_->stride(media::VideoFrame::kYPlane),
                            sw_out_frame_->data(media::VideoFrame::kUPlane),
                            sw_out_frame_->stride(media::VideoFrame::kUPlane),
                            sw_out_frame_->data(media::VideoFrame::kVPlane),
                            sw_out_frame_->stride(media::VideoFrame::kVPlane),
                            0, 0, sw_out_frame_->visible_rect().width(),
                            sw_out_frame_->visible_rect().height(),
                            sw_out_frame_->visible_rect().width(),
                            sw_out_frame_->visible_rect().height(),
                            libyuv::kRotate0, libyuv::FOURCC_MJPG) != 0) {
    LOG(ERROR) << "Software decode " << image_file->filename() << " failed.";
    return false;
  }
  return true;
}

// This class holds a |client| that will be deleted on |task_runner|. This is
// necessary because |client->decoder_| expects to be destroyed on the thread on
// which it was created.
class ScopedJpegClient {
 public:
  ScopedJpegClient(scoped_refptr<base::SingleThreadTaskRunner> task_runner,
                   std::unique_ptr<JpegClient> client)
      : task_runner_(task_runner), client_(std::move(client)) {}
  ~ScopedJpegClient() {
    task_runner_->DeleteSoon(FROM_HERE, std::move(client_));
  }
  JpegClient* client() const { return client_.get(); }

 private:
  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
  std::unique_ptr<JpegClient> client_;

  DISALLOW_COPY_AND_ASSIGN(ScopedJpegClient);
};

class MjpegDecodeAcceleratorTest : public ::testing::Test {
 protected:
  MjpegDecodeAcceleratorTest() = default;

  void TestDecode(const std::vector<ParsedJpegImage*>& images,
                  const std::vector<ClientState>& expected_status,
                  size_t num_concurrent_decoders = 1);
  void PerfDecodeByJDA(int decode_times,
                       const std::vector<ParsedJpegImage*>& images);
  void PerfDecodeBySW(int decode_times,
                      const std::vector<ParsedJpegImage*>& images);

 protected:
  DISALLOW_COPY_AND_ASSIGN(MjpegDecodeAcceleratorTest);
};

void MjpegDecodeAcceleratorTest::TestDecode(
    const std::vector<ParsedJpegImage*>& images,
    const std::vector<ClientState>& expected_status,
    size_t num_concurrent_decoders) {
  LOG_ASSERT(images.size() >= expected_status.size());
  base::Thread decoder_thread("DecoderThread");
  ASSERT_TRUE(decoder_thread.Start());

  std::vector<std::unique_ptr<ScopedJpegClient>> scoped_clients;

  for (size_t i = 0; i < num_concurrent_decoders; i++) {
    auto client = std::make_unique<JpegClient>(
        images,
        std::make_unique<media::test::ClientStateNotification<ClientState>>(),
        false /* is_skip */);
    scoped_clients.emplace_back(
        new ScopedJpegClient(decoder_thread.task_runner(), std::move(client)));

    decoder_thread.task_runner()->PostTask(
        FROM_HERE,
        base::BindOnce(&JpegClient::CreateJpegDecoder,
                       base::Unretained(scoped_clients.back()->client())));
    ASSERT_EQ(scoped_clients.back()->client()->note()->Wait(), CS_INITIALIZED);
  }

  for (size_t index = 0; index < images.size(); index++) {
    for (const auto& scoped_client : scoped_clients) {
      decoder_thread.task_runner()->PostTask(
          FROM_HERE, base::BindOnce(&JpegClient::StartDecode,
                                    base::Unretained(scoped_client->client()),
                                    index, true));
    }
    if (index < expected_status.size()) {
      for (const auto& scoped_client : scoped_clients) {
        ASSERT_EQ(scoped_client->client()->note()->Wait(),
                  expected_status[index]);
      }
    }
  }
}

void MjpegDecodeAcceleratorTest::PerfDecodeByJDA(
    int decode_times,
    const std::vector<ParsedJpegImage*>& images) {
  LOG_ASSERT(images.size() == 1);
  base::Thread decoder_thread("DecoderThread");
  ASSERT_TRUE(decoder_thread.Start());

  auto client = std::make_unique<JpegClient>(
      images,
      std::make_unique<media::test::ClientStateNotification<ClientState>>(),
      true /* is_skip */);
  auto scoped_client = std::make_unique<ScopedJpegClient>(
      decoder_thread.task_runner(), std::move(client));

  decoder_thread.task_runner()->PostTask(
      FROM_HERE, base::BindOnce(&JpegClient::CreateJpegDecoder,
                                base::Unretained(scoped_client->client())));
  ASSERT_EQ(scoped_client->client()->note()->Wait(), CS_INITIALIZED);

  const int32_t bitstream_buffer_id = 0;
  scoped_client->client()->PrepareMemory(bitstream_buffer_id);
  const base::ElapsedTimer timer;
  for (int index = 0; index < decode_times; index++) {
    decoder_thread.task_runner()->PostTask(
        FROM_HERE, base::BindOnce(&JpegClient::StartDecode,
                                  base::Unretained(scoped_client->client()),
                                  bitstream_buffer_id, false));
    ASSERT_EQ(scoped_client->client()->note()->Wait(), CS_DECODE_PASS);
  }
  const base::TimeDelta elapsed_time = timer.Elapsed();
  LOG(INFO) << elapsed_time << " for " << decode_times
            << " iterations (avg: " << elapsed_time / decode_times << ") -- "
            << images[0]->visible_size.ToString() << ", ("
            << images[0]->visible_size.GetArea() << " pixels) "
            << images[0]->filename();
}

void MjpegDecodeAcceleratorTest::PerfDecodeBySW(
    int decode_times,
    const std::vector<ParsedJpegImage*>& images) {
  LOG_ASSERT(images.size() == 1);

  std::unique_ptr<JpegClient> client = std::make_unique<JpegClient>(
      images,
      std::make_unique<media::test::ClientStateNotification<ClientState>>(),
      true /* is_skip */);

  const int32_t bitstream_buffer_id = 0;
  client->PrepareMemory(bitstream_buffer_id);
  const base::ElapsedTimer timer;
  for (int index = 0; index < decode_times; index++)
    client->GetSoftwareDecodeResult(bitstream_buffer_id);
  const base::TimeDelta elapsed_time = timer.Elapsed();
  LOG(INFO) << elapsed_time << " for " << decode_times
            << " iterations (avg: " << elapsed_time / decode_times << ") -- "
            << images[0]->visible_size.ToString() << ", ("
            << images[0]->visible_size.GetArea() << " pixels) "
            << images[0]->filename();
}

// Returns a media::VideoFrame that contains YUV data using 4:2:0 subsampling.
// The visible size is 3x3, and the coded size is 4x4 which is 3x3 rounded up to
// the next even dimensions.
scoped_refptr<media::VideoFrame> GetTestDecodedData() {
  scoped_refptr<media::VideoFrame> frame =
      media::VideoFrame::CreateZeroInitializedFrame(
          media::PIXEL_FORMAT_I420, gfx::Size(4, 4) /* coded_size */,
          gfx::Rect(3, 3) /* visible_rect */,
          gfx::Size(3, 3) /* natural_size */, base::TimeDelta());
  LOG_ASSERT(frame.get());
  uint8_t* y_data = frame->data(media::VideoFrame::kYPlane);
  int y_stride = frame->stride(media::VideoFrame::kYPlane);
  uint8_t* u_data = frame->data(media::VideoFrame::kUPlane);
  int u_stride = frame->stride(media::VideoFrame::kUPlane);
  uint8_t* v_data = frame->data(media::VideoFrame::kVPlane);
  int v_stride = frame->stride(media::VideoFrame::kVPlane);

  // Data for the Y plane.
  memcpy(&y_data[0 * y_stride], "\x01\x02\x03", 3);
  memcpy(&y_data[1 * y_stride], "\x04\x05\x06", 3);
  memcpy(&y_data[2 * y_stride], "\x07\x08\x09", 3);

  // Data for the U plane.
  memcpy(&u_data[0 * u_stride], "\x0A\x0B", 2);
  memcpy(&u_data[1 * u_stride], "\x0C\x0D", 2);

  // Data for the V plane.
  memcpy(&v_data[0 * v_stride], "\x0E\x0F", 2);
  memcpy(&v_data[1 * v_stride], "\x10\x11", 2);

  return frame;
}

TEST(JpegClientTest, GetMeanAbsoluteDifference) {
  JpegClient client(std::vector<ParsedJpegImage*>(), nullptr, false);
  client.hw_out_frame_ = GetTestDecodedData();
  client.sw_out_frame_ = GetTestDecodedData();

  uint8_t* y_data = client.sw_out_frame_->data(media::VideoFrame::kYPlane);
  const int y_stride = client.sw_out_frame_->stride(media::VideoFrame::kYPlane);
  uint8_t* u_data = client.sw_out_frame_->data(media::VideoFrame::kUPlane);
  const int u_stride = client.sw_out_frame_->stride(media::VideoFrame::kUPlane);
  uint8_t* v_data = client.sw_out_frame_->data(media::VideoFrame::kVPlane);
  const int v_stride = client.sw_out_frame_->stride(media::VideoFrame::kVPlane);

  // Change some visible data in the software decoding result.
  double expected_abs_mean_diff = 0;
  y_data[0] = 0xF0;  // Previously 0x01.
  expected_abs_mean_diff += 0xF0 - 0x01;
  y_data[y_stride + 1] = 0x8A;  // Previously 0x05.
  expected_abs_mean_diff += 0x8A - 0x05;
  u_data[u_stride] = 0x02;  // Previously 0x0C.
  expected_abs_mean_diff += 0x0C - 0x02;
  v_data[v_stride + 1] = 0x54;  // Previously 0x11.
  expected_abs_mean_diff += 0x54 - 0x11;
  expected_abs_mean_diff /= 3 * 3 + 2 * 2 * 2;

  constexpr double kMaxAllowedDifference = 1e-7;
  EXPECT_NEAR(expected_abs_mean_diff, client.GetMeanAbsoluteDifference(),
              kMaxAllowedDifference);

  // Change some non-visible data in the software decoding result, i.e., part of
  // the stride padding. This should not affect the absolute mean difference.
  y_data[3] = 0xAB;
  EXPECT_NEAR(expected_abs_mean_diff, client.GetMeanAbsoluteDifference(),
              kMaxAllowedDifference);
}

TEST_F(MjpegDecodeAcceleratorTest, SimpleDecode) {
  std::vector<ParsedJpegImage*> images;
  for (auto& image : g_env->image_data_user_)
    images.push_back(image.get());
  const std::vector<ClientState> expected_status(images.size(), CS_DECODE_PASS);
  TestDecode(images, expected_status);
}

TEST_F(MjpegDecodeAcceleratorTest, MultipleDecoders) {
  std::vector<ParsedJpegImage*> images;
  for (auto& image : g_env->image_data_user_)
    images.push_back(image.get());
  const std::vector<ClientState> expected_status(images.size(), CS_DECODE_PASS);
  TestDecode(images, expected_status, 3 /* num_concurrent_decoders */);
}

TEST_F(MjpegDecodeAcceleratorTest, InputSizeChange) {
  // The size of |image_data_1280x720_black_| is smaller than
  // |image_data_1280x720_default_|.
  const std::vector<ParsedJpegImage*> images = {
      g_env->image_data_1280x720_black_.get(),
      g_env->image_data_1280x720_default_.get(),
      g_env->image_data_1280x720_black_.get()};
  const std::vector<ClientState> expected_status(images.size(), CS_DECODE_PASS);
  TestDecode(images, expected_status);
}

TEST_F(MjpegDecodeAcceleratorTest, ResolutionChange) {
  const std::vector<ParsedJpegImage*> images = {
      g_env->image_data_640x368_black_.get(),
      g_env->image_data_1280x720_default_.get(),
      g_env->image_data_640x368_black_.get()};
  const std::vector<ClientState> expected_status(images.size(), CS_DECODE_PASS);
  TestDecode(images, expected_status);
}

TEST_F(MjpegDecodeAcceleratorTest, CodedSizeAlignment) {
  const std::vector<ParsedJpegImage*> images = {
      g_env->image_data_640x360_black_.get()};
  const std::vector<ClientState> expected_status = {CS_DECODE_PASS};
  TestDecode(images, expected_status);
}

// Tests whether different JPEG sampling formats will be decoded correctly.
TEST_F(MjpegDecodeAcceleratorTest, SamplingFormatChange) {
  const std::vector<ParsedJpegImage*> images = {
      g_env->image_data_640x368_black_.get(),
      g_env->image_data_640x368_422_black_.get()};
  const std::vector<ClientState> expected_status(images.size(), CS_DECODE_PASS);
  TestDecode(images, expected_status);
}

TEST_F(MjpegDecodeAcceleratorTest, FailureJpeg) {
  const std::vector<ParsedJpegImage*> images = {
      g_env->image_data_invalid_.get()};
  const std::vector<ClientState> expected_status = {CS_ERROR};
  TestDecode(images, expected_status);
}

TEST_F(MjpegDecodeAcceleratorTest, KeepDecodeAfterFailure) {
  const std::vector<ParsedJpegImage*> images = {
      g_env->image_data_invalid_.get(),
      g_env->image_data_1280x720_default_.get()};
  const std::vector<ClientState> expected_status = {CS_ERROR, CS_DECODE_PASS};
  TestDecode(images, expected_status);
}

TEST_F(MjpegDecodeAcceleratorTest, Abort) {
  constexpr size_t kNumOfJpegToDecode = 5;
  const std::vector<ParsedJpegImage*> images(
      kNumOfJpegToDecode, g_env->image_data_1280x720_default_.get());
  // Verify only one decode success to ensure both decoders have started the
  // decoding. Then destroy the first decoder when it is still decoding. The
  // kernel should not crash during this test.
  const std::vector<ClientState> expected_status = {CS_DECODE_PASS};
  TestDecode(images, expected_status, 2 /* num_concurrent_decoders */);
}

TEST_F(MjpegDecodeAcceleratorTest, PerfJDA) {
  // Only the first image will be used for perf testing.
  ASSERT_GE(g_env->image_data_user_.size(), 1u);
  const std::vector<ParsedJpegImage*> images = {
      g_env->image_data_user_[0].get()};
  PerfDecodeByJDA(g_env->perf_decode_times_, images);
}

TEST_F(MjpegDecodeAcceleratorTest, PerfSW) {
  // Only the first image will be used for perf testing.
  ASSERT_GE(g_env->image_data_user_.size(), 1u);
  const std::vector<ParsedJpegImage*> images = {
      g_env->image_data_user_[0].get()};
  PerfDecodeBySW(g_env->perf_decode_times_, images);
}

}  // namespace
}  // namespace chromeos_camera

int main(int argc, char** argv) {
  testing::InitGoogleTest(&argc, argv);
  base::CommandLine::Init(argc, argv);
  mojo::core::Init();
  base::ShadowingAtExitManager at_exit_manager;

  // Needed to enable DVLOG through --vmodule.
  logging::LoggingSettings settings;
  settings.logging_dest =
      logging::LOG_TO_SYSTEM_DEBUG_LOG | logging::LOG_TO_STDERR;
  LOG_ASSERT(logging::InitLogging(settings));

  const base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess();
  DCHECK(cmd_line);

  const base::FilePath::CharType* jpeg_filenames = nullptr;
  const base::FilePath::CharType* test_data_path = nullptr;
  int perf_decode_times = 0;
  base::CommandLine::SwitchMap switches = cmd_line->GetSwitches();
  for (base::CommandLine::SwitchMap::const_iterator it = switches.begin();
       it != switches.end(); ++it) {
    // jpeg_filenames can include one or many files and use ';' as delimiter.
    if (it->first == "jpeg_filenames") {
      jpeg_filenames = it->second.c_str();
      continue;
    }
    if (it->first == "test_data_path") {
      test_data_path = it->second.c_str();
      continue;
    }
    if (it->first == "perf_decode_times") {
      perf_decode_times = std::stoi(it->second);
      continue;
    }
    if (it->first == "save_to_file") {
      chromeos_camera::g_save_to_file = true;
      continue;
    }
    if (it->first == "v" || it->first == "vmodule")
      continue;
    if (it->first == "h" || it->first == "help")
      continue;
    LOG(ERROR) << "Unexpected switch: " << it->first << ":" << it->second;
    return -EINVAL;
  }
#if BUILDFLAG(USE_VAAPI)
  media::VaapiWrapper::PreSandboxInitialization();
#endif

  chromeos_camera::g_env =
      reinterpret_cast<chromeos_camera::MjpegDecodeAcceleratorTestEnvironment*>(
          testing::AddGlobalTestEnvironment(
              new chromeos_camera::MjpegDecodeAcceleratorTestEnvironment(
                  jpeg_filenames, test_data_path, perf_decode_times)));

  return RUN_ALL_TESTS();
}