/*
 *  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 <stdint.h>
#include <memory>

#include "absl/types/optional.h"
#include "api/video/color_space.h"
#include "api/video/encoded_image.h"
#include "api/video/video_frame.h"
#include "api/video_codecs/video_codec.h"
#include "api/video_codecs/video_decoder.h"
#include "api/video_codecs/video_encoder.h"
#include "common_video/libyuv/include/webrtc_libyuv.h"
#include "common_video/test/utilities.h"
#include "media/base/codec.h"
#include "media/base/media_constants.h"
#include "modules/video_coding/codecs/h264/include/h264.h"
#include "modules/video_coding/codecs/test/video_codec_unittest.h"
#include "modules/video_coding/include/video_codec_interface.h"
#include "modules/video_coding/include/video_error_codes.h"
#include "test/gtest.h"
#include "test/video_codec_settings.h"

namespace webrtc {

class TestH264Impl : public VideoCodecUnitTest {
 protected:
  std::unique_ptr<VideoEncoder> CreateEncoder() override {
    return H264Encoder::Create(cricket::VideoCodec(cricket::kH264CodecName));
  }

  std::unique_ptr<VideoDecoder> CreateDecoder() override {
    return H264Decoder::Create();
  }

  void ModifyCodecSettings(VideoCodec* codec_settings) override {
    webrtc::test::CodecSettings(kVideoCodecH264, codec_settings);
  }
};

#ifdef WEBRTC_USE_H264
#define MAYBE_EncodeDecode EncodeDecode
#define MAYBE_DecodedQpEqualsEncodedQp DecodedQpEqualsEncodedQp
#define MAYBE_EncodedColorSpaceEqualsInputColorSpace \
  EncodedColorSpaceEqualsInputColorSpace
#define MAYBE_DecodedColorSpaceEqualsEncodedColorSpace \
  DecodedColorSpaceEqualsEncodedColorSpace
#else
#define MAYBE_EncodeDecode DISABLED_EncodeDecode
#define MAYBE_DecodedQpEqualsEncodedQp DISABLED_DecodedQpEqualsEncodedQp
#define MAYBE_EncodedColorSpaceEqualsInputColorSpace \
  DISABLED_EncodedColorSpaceEqualsInputColorSpace
#define MAYBE_DecodedColorSpaceEqualsEncodedColorSpace \
  DISABLED_DecodedColorSpaceEqualsEncodedColorSpace
#endif

TEST_F(TestH264Impl, MAYBE_EncodeDecode) {
  VideoFrame* input_frame = NextInputFrame();
  EXPECT_EQ(WEBRTC_VIDEO_CODEC_OK, encoder_->Encode(*input_frame, nullptr));
  EncodedImage encoded_frame;
  CodecSpecificInfo codec_specific_info;
  ASSERT_TRUE(WaitForEncodedFrame(&encoded_frame, &codec_specific_info));
  // First frame should be a key frame.
  encoded_frame._frameType = VideoFrameType::kVideoFrameKey;
  EXPECT_EQ(WEBRTC_VIDEO_CODEC_OK, decoder_->Decode(encoded_frame, false, 0));
  std::unique_ptr<VideoFrame> decoded_frame;
  absl::optional<uint8_t> decoded_qp;
  ASSERT_TRUE(WaitForDecodedFrame(&decoded_frame, &decoded_qp));
  ASSERT_TRUE(decoded_frame);
  EXPECT_GT(I420PSNR(input_frame, decoded_frame.get()), 36);

  const ColorSpace color_space = *decoded_frame->color_space();
  EXPECT_EQ(ColorSpace::PrimaryID::kUnspecified, color_space.primaries());
  EXPECT_EQ(ColorSpace::TransferID::kUnspecified, color_space.transfer());
  EXPECT_EQ(ColorSpace::MatrixID::kUnspecified, color_space.matrix());
  EXPECT_EQ(ColorSpace::RangeID::kInvalid, color_space.range());
  EXPECT_EQ(ColorSpace::ChromaSiting::kUnspecified,
            color_space.chroma_siting_horizontal());
  EXPECT_EQ(ColorSpace::ChromaSiting::kUnspecified,
            color_space.chroma_siting_vertical());
}

TEST_F(TestH264Impl, MAYBE_DecodedQpEqualsEncodedQp) {
  EXPECT_EQ(WEBRTC_VIDEO_CODEC_OK,
            encoder_->Encode(*NextInputFrame(), nullptr));
  EncodedImage encoded_frame;
  CodecSpecificInfo codec_specific_info;
  ASSERT_TRUE(WaitForEncodedFrame(&encoded_frame, &codec_specific_info));
  // First frame should be a key frame.
  encoded_frame._frameType = VideoFrameType::kVideoFrameKey;
  EXPECT_EQ(WEBRTC_VIDEO_CODEC_OK, decoder_->Decode(encoded_frame, false, 0));
  std::unique_ptr<VideoFrame> decoded_frame;
  absl::optional<uint8_t> decoded_qp;
  ASSERT_TRUE(WaitForDecodedFrame(&decoded_frame, &decoded_qp));
  ASSERT_TRUE(decoded_frame);
  ASSERT_TRUE(decoded_qp);
  EXPECT_EQ(encoded_frame.qp_, *decoded_qp);
}

TEST_F(TestH264Impl, MAYBE_EncodedColorSpaceEqualsInputColorSpace) {
  VideoFrame* input_frame = NextInputFrame();
  EXPECT_EQ(WEBRTC_VIDEO_CODEC_OK, encoder_->Encode(*input_frame, nullptr));
  EncodedImage encoded_frame;
  CodecSpecificInfo codec_specific_info;
  ASSERT_TRUE(WaitForEncodedFrame(&encoded_frame, &codec_specific_info));
  EXPECT_FALSE(encoded_frame.ColorSpace());

  // Video frame with explicit color space information.
  ColorSpace color_space = CreateTestColorSpace(/*with_hdr_metadata=*/false);
  VideoFrame input_frame_w_color_space =
      VideoFrame::Builder()
          .set_video_frame_buffer(input_frame->video_frame_buffer())
          .set_color_space(color_space)
          .build();

  EXPECT_EQ(WEBRTC_VIDEO_CODEC_OK,
            encoder_->Encode(input_frame_w_color_space, nullptr));
  ASSERT_TRUE(WaitForEncodedFrame(&encoded_frame, &codec_specific_info));
  ASSERT_TRUE(encoded_frame.ColorSpace());
  EXPECT_EQ(*encoded_frame.ColorSpace(), color_space);
}

TEST_F(TestH264Impl, MAYBE_DecodedColorSpaceEqualsEncodedColorSpace) {
  EXPECT_EQ(WEBRTC_VIDEO_CODEC_OK,
            encoder_->Encode(*NextInputFrame(), nullptr));
  EncodedImage encoded_frame;
  CodecSpecificInfo codec_specific_info;
  ASSERT_TRUE(WaitForEncodedFrame(&encoded_frame, &codec_specific_info));
  // Add color space to encoded frame.
  ColorSpace color_space = CreateTestColorSpace(/*with_hdr_metadata=*/false);
  encoded_frame.SetColorSpace(color_space);
  EXPECT_EQ(WEBRTC_VIDEO_CODEC_OK, decoder_->Decode(encoded_frame, false, 0));
  std::unique_ptr<VideoFrame> decoded_frame;
  absl::optional<uint8_t> decoded_qp;
  ASSERT_TRUE(WaitForDecodedFrame(&decoded_frame, &decoded_qp));
  ASSERT_TRUE(decoded_frame);
  ASSERT_TRUE(decoded_frame->color_space());
  EXPECT_EQ(color_space, *decoded_frame->color_space());
}

}  // namespace webrtc