/*
 *  Copyright (c) 2012 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 <math.h>
#include <string.h>

#include <memory>

#include "webrtc/api/video/i420_buffer.h"
#include "webrtc/api/video/video_frame.h"
#include "webrtc/common_video/libyuv/include/webrtc_libyuv.h"
#include "webrtc/test/frame_utils.h"
#include "webrtc/test/gmock.h"
#include "webrtc/test/gtest.h"
#include "webrtc/test/testsupport/fileutils.h"

namespace webrtc {

namespace {
void Calc16ByteAlignedStride(int width, int* stride_y, int* stride_uv) {
  *stride_y = 16 * ((width + 15) / 16);
  *stride_uv = 16 * ((width + 31) / 32);
}

}  // Anonymous namespace

class TestLibYuv : public ::testing::Test {
 protected:
  TestLibYuv();
  virtual void SetUp();
  virtual void TearDown();

  FILE* source_file_;
  std::unique_ptr<VideoFrame> orig_frame_;
  const int width_;
  const int height_;
  const int size_y_;
  const int size_uv_;
  const size_t frame_length_;
};

TestLibYuv::TestLibYuv()
    : source_file_(NULL),
      orig_frame_(),
      width_(352),
      height_(288),
      size_y_(width_ * height_),
      size_uv_(((width_ + 1) / 2) * ((height_ + 1) / 2)),
      frame_length_(CalcBufferSize(VideoType::kI420, 352, 288)) {}

void TestLibYuv::SetUp() {
  const std::string input_file_name = webrtc::test::ResourcePath("foreman_cif",
                                                                 "yuv");
  source_file_  = fopen(input_file_name.c_str(), "rb");
  ASSERT_TRUE(source_file_ != NULL) << "Cannot read file: "<<
                                       input_file_name << "\n";

  rtc::scoped_refptr<I420BufferInterface> buffer(
      test::ReadI420Buffer(width_, height_, source_file_));

  orig_frame_.reset(new VideoFrame(buffer, kVideoRotation_0, 0));
}

void TestLibYuv::TearDown() {
  if (source_file_ != NULL) {
    ASSERT_EQ(0, fclose(source_file_));
  }
  source_file_ = NULL;
}

TEST_F(TestLibYuv, ConvertSanityTest) {
  // TODO(mikhal)
}

TEST_F(TestLibYuv, ConvertTest) {
  // Reading YUV frame - testing on the first frame of the foreman sequence
  int j = 0;
  std::string output_file_name = webrtc::test::OutputPath() +
                                 "LibYuvTest_conversion.yuv";
  FILE*  output_file = fopen(output_file_name.c_str(), "wb");
  ASSERT_TRUE(output_file != NULL);

  double psnr = 0.0;

  rtc::scoped_refptr<I420Buffer> res_i420_buffer =
      I420Buffer::Create(width_, height_);

  printf("\nConvert #%d I420 <-> I420 \n", j);
  std::unique_ptr<uint8_t[]> out_i420_buffer(new uint8_t[frame_length_]);
  EXPECT_EQ(0, ConvertFromI420(*orig_frame_, VideoType::kI420, 0,
                               out_i420_buffer.get()));
  EXPECT_EQ(0,
            ConvertToI420(VideoType::kI420, out_i420_buffer.get(), 0, 0, width_,
                          height_, 0, kVideoRotation_0, res_i420_buffer.get()));

  if (PrintVideoFrame(*res_i420_buffer, output_file) < 0) {
    return;
  }
  psnr =
      I420PSNR(*orig_frame_->video_frame_buffer()->GetI420(), *res_i420_buffer);
  EXPECT_EQ(48.0, psnr);
  j++;

  printf("\nConvert #%d I420 <-> RGB24\n", j);
  std::unique_ptr<uint8_t[]> res_rgb_buffer2(new uint8_t[width_ * height_ * 3]);
  // Align the stride values for the output frame.
  int stride_y = 0;
  int stride_uv = 0;
  Calc16ByteAlignedStride(width_, &stride_y, &stride_uv);
  res_i420_buffer =
      I420Buffer::Create(width_, height_, stride_y, stride_uv, stride_uv);
  EXPECT_EQ(0, ConvertFromI420(*orig_frame_, VideoType::kRGB24, 0,
                               res_rgb_buffer2.get()));

  EXPECT_EQ(
      0, ConvertToI420(VideoType::kRGB24, res_rgb_buffer2.get(), 0, 0, width_,
                       height_, 0, kVideoRotation_0, res_i420_buffer.get()));

  if (PrintVideoFrame(*res_i420_buffer, output_file) < 0) {
    return;
  }
  psnr =
      I420PSNR(*orig_frame_->video_frame_buffer()->GetI420(), *res_i420_buffer);

  // Optimization Speed- quality trade-off => 45 dB only (platform dependant).
  EXPECT_GT(ceil(psnr), 44);
  j++;

  printf("\nConvert #%d I420 <-> UYVY\n", j);
  std::unique_ptr<uint8_t[]> out_uyvy_buffer(new uint8_t[width_ * height_ * 2]);
  EXPECT_EQ(0, ConvertFromI420(*orig_frame_, VideoType::kUYVY, 0,
                               out_uyvy_buffer.get()));
  EXPECT_EQ(0,
            ConvertToI420(VideoType::kUYVY, out_uyvy_buffer.get(), 0, 0, width_,
                          height_, 0, kVideoRotation_0, res_i420_buffer.get()));
  psnr =
      I420PSNR(*orig_frame_->video_frame_buffer()->GetI420(), *res_i420_buffer);
  EXPECT_EQ(48.0, psnr);
  if (PrintVideoFrame(*res_i420_buffer, output_file) < 0) {
    return;
  }
  j++;

  printf("\nConvert #%d I420 <-> YUY2\n", j);
  std::unique_ptr<uint8_t[]> out_yuy2_buffer(new uint8_t[width_ * height_ * 2]);
  EXPECT_EQ(0, ConvertFromI420(*orig_frame_, VideoType::kYUY2, 0,
                               out_yuy2_buffer.get()));

  EXPECT_EQ(0,
            ConvertToI420(VideoType::kYUY2, out_yuy2_buffer.get(), 0, 0, width_,
                          height_, 0, kVideoRotation_0, res_i420_buffer.get()));

  if (PrintVideoFrame(*res_i420_buffer, output_file) < 0) {
    return;
  }

  psnr =
      I420PSNR(*orig_frame_->video_frame_buffer()->GetI420(), *res_i420_buffer);
  EXPECT_EQ(48.0, psnr);

  printf("\nConvert #%d I420 <-> RGB565\n", j);
  std::unique_ptr<uint8_t[]> out_rgb565_buffer(
      new uint8_t[width_ * height_ * 2]);
  EXPECT_EQ(0, ConvertFromI420(*orig_frame_, VideoType::kRGB565, 0,
                               out_rgb565_buffer.get()));

  EXPECT_EQ(0, ConvertToI420(VideoType::kRGB565, out_rgb565_buffer.get(), 0, 0,
                             width_, height_, 0, kVideoRotation_0,
                             res_i420_buffer.get()));
  if (PrintVideoFrame(*res_i420_buffer, output_file) < 0) {
    return;
  }
  j++;

  psnr =
      I420PSNR(*orig_frame_->video_frame_buffer()->GetI420(), *res_i420_buffer);
  // TODO(leozwang) Investigate the right psnr should be set for I420ToRGB565,
  // Another example is I420ToRGB24, the psnr is 44
  // TODO(mikhal): Add psnr for RGB565, 1555, 4444, convert to ARGB.
  EXPECT_GT(ceil(psnr), 40);

  printf("\nConvert #%d I420 <-> ARGB8888\n", j);
  std::unique_ptr<uint8_t[]> out_argb8888_buffer(
      new uint8_t[width_ * height_ * 4]);
  EXPECT_EQ(0, ConvertFromI420(*orig_frame_, VideoType::kARGB, 0,
                               out_argb8888_buffer.get()));

  EXPECT_EQ(0, ConvertToI420(VideoType::kARGB, out_argb8888_buffer.get(), 0, 0,
                             width_, height_, 0, kVideoRotation_0,
                             res_i420_buffer.get()));

  if (PrintVideoFrame(*res_i420_buffer, output_file) < 0) {
    return;
  }

  psnr =
      I420PSNR(*orig_frame_->video_frame_buffer()->GetI420(), *res_i420_buffer);
  // TODO(leozwang) Investigate the right psnr should be set for
  // I420ToARGB8888,
  EXPECT_GT(ceil(psnr), 42);

  ASSERT_EQ(0, fclose(output_file));
}

TEST_F(TestLibYuv, ConvertAlignedFrame) {
  // Reading YUV frame - testing on the first frame of the foreman sequence
  std::string output_file_name = webrtc::test::OutputPath() +
                                 "LibYuvTest_conversion.yuv";
  FILE*  output_file = fopen(output_file_name.c_str(), "wb");
  ASSERT_TRUE(output_file != NULL);

  double psnr = 0.0;

  int stride_y = 0;
  int stride_uv = 0;
  Calc16ByteAlignedStride(width_, &stride_y, &stride_uv);

  rtc::scoped_refptr<I420Buffer> res_i420_buffer =
      I420Buffer::Create(width_, height_, stride_y, stride_uv, stride_uv);
  std::unique_ptr<uint8_t[]> out_i420_buffer(new uint8_t[frame_length_]);
  EXPECT_EQ(0, ConvertFromI420(*orig_frame_, VideoType::kI420, 0,
                               out_i420_buffer.get()));
  EXPECT_EQ(0,
            ConvertToI420(VideoType::kI420, out_i420_buffer.get(), 0, 0, width_,
                          height_, 0, kVideoRotation_0, res_i420_buffer.get()));

  if (PrintVideoFrame(*res_i420_buffer, output_file) < 0) {
    return;
  }
  psnr =
      I420PSNR(*orig_frame_->video_frame_buffer()->GetI420(), *res_i420_buffer);
  EXPECT_EQ(48.0, psnr);
}

TEST_F(TestLibYuv, RotateTest) {
  // Use ConvertToI420 for multiple rotations - see that nothing breaks, all
  // memory is properly allocated and end result is equal to the starting point.
  int rotated_width = height_;
  int rotated_height = width_;
  int stride_y;
  int stride_uv;

  // Assume compact layout, no padding.
  const uint8_t* orig_buffer =
      orig_frame_->video_frame_buffer()->GetI420()->DataY();

  Calc16ByteAlignedStride(rotated_width, &stride_y, &stride_uv);
  rtc::scoped_refptr<I420Buffer> rotated_res_i420_buffer = I420Buffer::Create(
      rotated_width, rotated_height, stride_y, stride_uv, stride_uv);
  EXPECT_EQ(
      0, ConvertToI420(VideoType::kI420, orig_buffer, 0, 0, width_, height_, 0,
                       kVideoRotation_90, rotated_res_i420_buffer.get()));
  EXPECT_EQ(
      0, ConvertToI420(VideoType::kI420, orig_buffer, 0, 0, width_, height_, 0,
                       kVideoRotation_270, rotated_res_i420_buffer.get()));
  rotated_res_i420_buffer = I420Buffer::Create(width_, height_);
  EXPECT_EQ(
      0, ConvertToI420(VideoType::kI420, orig_buffer, 0, 0, width_, height_, 0,
                       kVideoRotation_180, rotated_res_i420_buffer.get()));
}

static uint8_t Average(int a, int b, int c, int d) {
  return (a + b + c + d + 2) / 4;
}

TEST_F(TestLibYuv, NV12Scale2x2to2x2) {
  const std::vector<uint8_t> src_y = {0, 1,
                                      2, 3};
  const std::vector<uint8_t> src_uv = {0, 1};
  std::vector<uint8_t> dst_y(4);
  std::vector<uint8_t> dst_uv(2);

  uint8_t* tmp_buffer = nullptr;

  NV12Scale(tmp_buffer,
            src_y.data(), 2,
            src_uv.data(), 2,
            2, 2,
            dst_y.data(), 2,
            dst_uv.data(), 2,
            2, 2);

  EXPECT_THAT(dst_y, ::testing::ContainerEq(src_y));
  EXPECT_THAT(dst_uv, ::testing::ContainerEq(src_uv));
}

TEST_F(TestLibYuv, NV12Scale4x4to2x2) {
  const uint8_t src_y[] = { 0,  1,  2,  3,
                            4,  5,  6,  7,
                            8,  9, 10, 11,
                           12, 13, 14, 15};
  const uint8_t src_uv[] = {0, 1, 2, 3,
                            4, 5, 6, 7};
  std::vector<uint8_t> dst_y(4);
  std::vector<uint8_t> dst_uv(2);

  std::vector<uint8_t> tmp_buffer;
  const int src_chroma_width = (4 + 1) / 2;
  const int src_chroma_height = (4 + 1) / 2;
  const int dst_chroma_width = (2 + 1) / 2;
  const int dst_chroma_height = (2 + 1) / 2;
  tmp_buffer.resize(src_chroma_width * src_chroma_height * 2 +
                    dst_chroma_width * dst_chroma_height * 2);
  tmp_buffer.shrink_to_fit();

  NV12Scale(tmp_buffer.data(),
            src_y, 4,
            src_uv, 4,
            4, 4,
            dst_y.data(), 2,
            dst_uv.data(), 2,
            2, 2);

  EXPECT_THAT(dst_y, ::testing::ElementsAre(
                         Average(0, 1, 4, 5), Average(2, 3, 6, 7),
                         Average(8, 9, 12, 13), Average(10, 11, 14, 15)));
  EXPECT_THAT(dst_uv,
              ::testing::ElementsAre(Average(0, 2, 4, 6), Average(1, 3, 5, 7)));
}

}  // namespace webrtc