/*
 *  Copyright (c) 2023 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 "common_video/h265/h265_bitstream_parser.h"

#include <cstdint>
#include <optional>

#include "api/array_view.h"
#include "common_video/h265/h265_common.h"
#include "test/gmock.h"
#include "test/gtest.h"

using ::testing::Eq;
using ::testing::Optional;

namespace webrtc {

// VPS/SPS/PPS part of below chunk.
constexpr uint8_t kH265VpsSpsPps[] = {
    0x00, 0x00, 0x00, 0x01, 0x40, 0x01, 0x0c, 0x01, 0xff, 0xff, 0x04, 0x08,
    0x00, 0x00, 0x03, 0x00, 0x9d, 0x08, 0x00, 0x00, 0x03, 0x00, 0x00, 0x78,
    0x95, 0x98, 0x09, 0x00, 0x00, 0x00, 0x01, 0x42, 0x01, 0x01, 0x04, 0x08,
    0x00, 0x00, 0x03, 0x00, 0x9d, 0x08, 0x00, 0x00, 0x03, 0x00, 0x00, 0x78,
    0xb0, 0x03, 0xc0, 0x80, 0x10, 0xe5, 0x96, 0x56, 0x69, 0x24, 0xca, 0xe0,
    0x10, 0x00, 0x00, 0x03, 0x00, 0x10, 0x00, 0x00, 0x03, 0x01, 0xe0, 0x80,
    0x00, 0x00, 0x00, 0x01, 0x44, 0x01, 0xc1, 0x72, 0xb4, 0x62, 0x40};

// Contains enough of the image slice to contain slice QP.
constexpr uint8_t kH265BitstreamChunk[] = {
    0x00, 0x00, 0x00, 0x01, 0x40, 0x01, 0x0c, 0x01, 0xff, 0xff, 0x04, 0x08,
    0x00, 0x00, 0x03, 0x00, 0x9d, 0x08, 0x00, 0x00, 0x03, 0x00, 0x00, 0x78,
    0x95, 0x98, 0x09, 0x00, 0x00, 0x00, 0x01, 0x42, 0x01, 0x01, 0x04, 0x08,
    0x00, 0x00, 0x03, 0x00, 0x9d, 0x08, 0x00, 0x00, 0x03, 0x00, 0x00, 0x78,
    0xb0, 0x03, 0xc0, 0x80, 0x10, 0xe5, 0x96, 0x56, 0x69, 0x24, 0xca, 0xe0,
    0x10, 0x00, 0x00, 0x03, 0x00, 0x10, 0x00, 0x00, 0x03, 0x01, 0xe0, 0x80,
    0x00, 0x00, 0x00, 0x01, 0x44, 0x01, 0xc1, 0x72, 0xb4, 0x62, 0x40, 0x00,
    0x00, 0x01, 0x26, 0x01, 0xaf, 0x08, 0x42, 0x23, 0x10, 0x5d, 0x2b, 0x51,
    0xf9, 0x7a, 0x55, 0x15, 0x0d, 0x10, 0x40, 0xe8, 0x10, 0x05, 0x30, 0x95,
    0x09, 0x9a, 0xa5, 0xb6, 0x6a, 0x66, 0x6d, 0xde, 0xe0, 0xf9,
};

// Contains enough of the image slice to contain slice QP.
constexpr uint8_t kH265BitstreamNextImageSliceChunk[] = {
    0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0xe0, 0x24, 0xbf, 0x82, 0x05,
    0x21, 0x12, 0x22, 0xa3, 0x29, 0xb4, 0x21, 0x91, 0xa1, 0xaa, 0x40,
};

// Contains enough of the image slice to contain slice QP.
constexpr uint8_t kH265SliceChunk[] = {
    0xa4, 0x04, 0x55, 0xa2, 0x6d, 0xce, 0xc0, 0xc3, 0xed, 0x0b, 0xac, 0xbc,
    0x00, 0xc4, 0x44, 0x2e, 0xf7, 0x55, 0xfd, 0x05, 0x86, 0x92, 0x19, 0xdf,
    0x58, 0xec, 0x38, 0x36, 0xb7, 0x7c, 0x00, 0x15, 0x33, 0x78, 0x03, 0x67,
    0x26, 0x0f, 0x7b, 0x30, 0x1c, 0xd7, 0xd4, 0x3a, 0xec, 0xad, 0xef, 0x73,
};

// Contains enough of data for the second slice of a frame.
constexpr uint8_t kH265SecondSliceChunkInAFrame[] = {
    0x02, 0x01, 0x23, 0xfc, 0x20, 0x22, 0xad, 0x13, 0x68, 0xce, 0xc3, 0x5a,
    0x00, 0xdc, 0xeb, 0x86, 0x4b, 0x0b, 0xa7, 0x6a, 0xe1, 0x9c, 0x5c, 0xea,
};

// Contains short term ref pic set slice to verify Log2Ceiling path.
constexpr uint8_t kH265SliceStrChunk[] = {
    0x00, 0x00, 0x00, 0x01, 0x40, 0x01, 0x0c, 0x01, 0xff, 0xff, 0x01, 0x00,
    0x00, 0x03, 0x00, 0x00, 0x03, 0x00, 0x00, 0x03, 0x00, 0x00, 0x03, 0x00,
    0x00, 0x99, 0x94, 0x90, 0x24, 0x00, 0x00, 0x00, 0x01, 0x42, 0x01, 0x01,
    0x01, 0x00, 0x00, 0x03, 0x00, 0x00, 0x03, 0x00, 0x00, 0x03, 0x00, 0x00,
    0x03, 0x00, 0x00, 0x99, 0xa0, 0x01, 0x40, 0x20, 0x06, 0x41, 0xfe, 0x59,
    0x49, 0x26, 0x4d, 0x86, 0x16, 0x22, 0xaa, 0x4c, 0x4c, 0x32, 0xfb, 0x3e,
    0xbc, 0xdf, 0x96, 0x7d, 0x78, 0x51, 0x18, 0x9c, 0xbb, 0x20, 0x00, 0x00,
    0x00, 0x01, 0x44, 0x01, 0xc1, 0xa5, 0x58, 0x11, 0x20, 0x00, 0x00, 0x01,
    0x02, 0x01, 0xe1, 0x18, 0xfe, 0x47, 0x60, 0xd2, 0x74, 0xd6, 0x9f, 0xfc,
    0xbe, 0x6b, 0x15, 0x48, 0x59, 0x1f, 0xf7, 0xc1, 0x7c, 0xe2, 0xe8, 0x10,
};

// Contains enough of the image slice to contain invalid slice QP -52.
constexpr uint8_t kH265BitstreamInvalidQPChunk[] = {
    0x00, 0x00, 0x00, 0x01, 0x40, 0x01, 0x0c, 0x01, 0xff, 0xff, 0x04, 0x08,
    0x00, 0x00, 0x03, 0x00, 0x9d, 0x08, 0x00, 0x00, 0x03, 0x00, 0x00, 0x78,
    0x95, 0x98, 0x09, 0x00, 0x00, 0x00, 0x01, 0x42, 0x01, 0x01, 0x04, 0x08,
    0x00, 0x00, 0x03, 0x00, 0x9d, 0x08, 0x00, 0x00, 0x03, 0x00, 0x00, 0x78,
    0xb0, 0x03, 0xc0, 0x80, 0x10, 0xe5, 0x96, 0x56, 0x69, 0x24, 0xca, 0xe0,
    0x10, 0x00, 0x00, 0x03, 0x00, 0x10, 0x00, 0x00, 0x03, 0x01, 0xe0, 0x80,
    0x00, 0x00, 0x00, 0x01, 0x44, 0x01, 0xc1, 0x72, 0xb4, 0x62, 0x40, 0x00,
    0x00, 0x01, 0x26, 0x01, 0xaf, 0x03, 0x4c,
};

// Contains enough of the image slice to contain invalid slice QP 52.
constexpr uint8_t kH265BitstreamInvalidQPChunk52[] = {
    0x00, 0x00, 0x00, 0x01, 0x40, 0x01, 0x0c, 0x01, 0xff, 0xff, 0x04, 0x08,
    0x00, 0x00, 0x03, 0x00, 0x9d, 0x08, 0x00, 0x00, 0x03, 0x00, 0x00, 0x78,
    0x95, 0x98, 0x09, 0x00, 0x00, 0x00, 0x01, 0x42, 0x01, 0x01, 0x04, 0x08,
    0x00, 0x00, 0x03, 0x00, 0x9d, 0x08, 0x00, 0x00, 0x03, 0x00, 0x00, 0x78,
    0xb0, 0x03, 0xc0, 0x80, 0x10, 0xe5, 0x96, 0x56, 0x69, 0x24, 0xca, 0xe0,
    0x10, 0x00, 0x00, 0x03, 0x00, 0x10, 0x00, 0x00, 0x03, 0x01, 0xe0, 0x80,
    0x00, 0x00, 0x00, 0x01, 0x44, 0x01, 0xc1, 0x72, 0xb4, 0x62, 0x40, 0x00,
    0x00, 0x01, 0x26, 0x01, 0xaf, 0x03, 0x44,
};

// Bitstream that contains pred_weight_table. Contains enough data to parse
// over pred_weight_table for slice QP. This is bear.hevc from Chromium source,
// used for H265 hardware decoder's parser test, with some slices truncated.
constexpr uint8_t kH265BitstreamWithPredWeightTable[] = {
    0x00, 0x00, 0x00, 0x01, 0x40, 0x01, 0x0c, 0x01, 0xff, 0xff, 0x01, 0x60,
    0x00, 0x00, 0x03, 0x00, 0x80, 0x00, 0x00, 0x03, 0x00, 0x00, 0x03, 0x00,
    0x3c, 0x95, 0xc0, 0x90, 0x00, 0x00, 0x00, 0x01, 0x42, 0x01, 0x01, 0x01,
    0x60, 0x00, 0x00, 0x03, 0x00, 0x80, 0x00, 0x00, 0x03, 0x00, 0x00, 0x03,
    0x00, 0x3c, 0xa0, 0x0a, 0x08, 0x0b, 0x9f, 0x79, 0x65, 0x79, 0x24, 0xca,
    0xe0, 0x10, 0x00, 0x00, 0x06, 0x40, 0x00, 0x00, 0xbb, 0x50, 0x80, 0x00,
    0x00, 0x00, 0x01, 0x44, 0x01, 0xc1, 0x73, 0xd1, 0x89, 0x00, 0x00, 0x00,
    0x01, 0x02, 0x01, 0xd0, 0x21, 0x49, 0xe8, 0xee, 0x50, 0x9c, 0x27, 0x20,
    0x42, 0xc4, 0xcd, 0x33, 0xf0, 0xb1, 0x23, 0x7b, 0xfe, 0x4d, 0xcf, 0x40,
    0xeb, 0x17, 0x37, 0x91, 0x1c, 0xb6, 0xba, 0x21, 0x42, 0xf7, 0xef, 0x01,
    0x08, 0x90, 0x49, 0xdc, 0xfc, 0x10, 0x1f, 0x5e, 0x02, 0xd9, 0xaa, 0xe8,
    0x32, 0xeb, 0x74, 0xbc, 0xdb, 0x2c, 0xa3, 0xec,
};

TEST(H265BitstreamParserTest, ReportsNoQpWithoutParsedSlices) {
  H265BitstreamParser h265_parser;
  EXPECT_FALSE(h265_parser.GetLastSliceQp().has_value());
}

TEST(H265BitstreamParserTest, ReportsNoQpWithOnlyParsedPpsAndSpsSlices) {
  H265BitstreamParser h265_parser;
  h265_parser.ParseBitstream(kH265VpsSpsPps);
  EXPECT_FALSE(h265_parser.GetLastSliceQp().has_value());
}

TEST(H265BitstreamParserTest, ReportQpWithPredWeightTable) {
  H265BitstreamParser h265_parser;
  h265_parser.ParseBitstream(kH265BitstreamWithPredWeightTable);
  std::optional<int> qp = h265_parser.GetLastSliceQp();
  ASSERT_TRUE(qp.has_value());
  EXPECT_EQ(34, *qp);
}

TEST(H265BitstreamParserTest, ReportsLastSliceQpForImageSlices) {
  H265BitstreamParser h265_parser;
  h265_parser.ParseBitstream(kH265BitstreamChunk);
  std::optional<int> qp = h265_parser.GetLastSliceQp();
  ASSERT_TRUE(qp.has_value());
  EXPECT_EQ(34, *qp);

  // Parse an additional image slice.
  h265_parser.ParseBitstream(kH265BitstreamNextImageSliceChunk);
  qp = h265_parser.GetLastSliceQp();
  ASSERT_TRUE(qp.has_value());
  EXPECT_EQ(36, *qp);
}

TEST(H265BitstreamParserTest, ReportsLastSliceQpFromShortTermReferenceSlices) {
  H265BitstreamParser h265_parser;
  h265_parser.ParseBitstream(kH265SliceStrChunk);
  std::optional<int> qp = h265_parser.GetLastSliceQp();
  ASSERT_TRUE(qp.has_value());
  EXPECT_EQ(33, *qp);
}

TEST(H265BitstreamParserTest, PpsIdFromSlice) {
  H265BitstreamParser h265_parser;
  std::optional<uint32_t> pps_id =
      h265_parser.ParsePpsIdFromSliceSegmentLayerRbsp(kH265SliceChunk,
                                                      H265::NaluType::kTrailR);
  ASSERT_TRUE(pps_id);
  EXPECT_EQ(1u, *pps_id);
}

TEST(H265BitstreamParserTest, ReportsLastSliceQpInvalidQPSlices) {
  H265BitstreamParser h265_parser;
  h265_parser.ParseBitstream(kH265BitstreamInvalidQPChunk);
  std::optional<int> qp = h265_parser.GetLastSliceQp();
  ASSERT_FALSE(qp.has_value());

  h265_parser.ParseBitstream(kH265BitstreamInvalidQPChunk52);
  qp = h265_parser.GetLastSliceQp();
  ASSERT_FALSE(qp.has_value());
}

TEST(H265BitstreamParserTest, ReportsFirstSliceSegmentInPic) {
  EXPECT_THAT(H265BitstreamParser::IsFirstSliceSegmentInPic(kH265SliceChunk),
              Optional(Eq(true)));
}

TEST(H265BitstreamParserTest, ReportsFirstSliceSegmentInPicFalse) {
  EXPECT_THAT(H265BitstreamParser::IsFirstSliceSegmentInPic(
                  kH265SecondSliceChunkInAFrame),
              Optional(Eq(false)));
}

TEST(H265BitstreamParserTest, ReportsFirstSliceSegmentInPicParseInvalidSlice) {
  ArrayView<const uint8_t> slice_data(kH265SliceChunk);
  EXPECT_THAT(
      H265BitstreamParser::IsFirstSliceSegmentInPic(slice_data.subview(50)),
      Eq(std::nullopt));
}

}  // namespace webrtc