chromium/third_party/libgav1/src/src/obu_parser.h

/*
 * Copyright 2019 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.
 */

#ifndef LIBGAV1_SRC_OBU_PARSER_H_
#define LIBGAV1_SRC_OBU_PARSER_H_

#include <array>
#include <cstddef>
#include <cstdint>
#include <memory>
#include <type_traits>
#include <utility>

#include "src/buffer_pool.h"
#include "src/decoder_state.h"
#include "src/dsp/common.h"
#include "src/gav1/decoder_buffer.h"
#include "src/gav1/status_code.h"
#include "src/quantizer.h"
#include "src/utils/common.h"
#include "src/utils/compiler_attributes.h"
#include "src/utils/constants.h"
#include "src/utils/raw_bit_reader.h"
#include "src/utils/segmentation.h"
#include "src/utils/vector.h"

namespace libgav1 {

// structs and enums related to Open Bitstream Units (OBU).

enum { … };  // anonymous enum

struct ObuHeader { … };

enum BitstreamProfile : uint8_t { … };

// In the bitstream the level is encoded in five bits: the first three bits
// encode |major| - 2 and the last two bits encode |minor|.
//
// If the mapped level (major.minor) is in the tables in Annex A.3, there are
// bitstream conformance requirements on the maximum or minimum values of
// several variables. The encoded value of 31 (which corresponds to the mapped
// level 9.3) is the "maximum parameters" level and imposes no level-based
// constraints on the bitstream.
struct BitStreamLevel { … };

struct ColorConfig { … };

struct TimingInfo { … };

struct DecoderModelInfo { … };

struct OperatingParameters { … };

struct ObuSequenceHeader { … };
// Verify it is safe to use offsetof with ObuSequenceHeader and to use memcmp
// to compare two ObuSequenceHeader objects.
static_assert …;
// Verify operating_parameters is the last member of ObuSequenceHeader. The
// second assertion assumes that ObuSequenceHeader has no padding after the
// operating_parameters field. The first assertion is a sufficient condition
// for ObuSequenceHeader to have no padding after the operating_parameters
// field.
static_assert …;
static_assert …;

struct TileBuffer { … };

enum MetadataType : uint8_t { … };

class ObuParser : public Allocable { … };

}  // namespace libgav1

#endif  // LIBGAV1_SRC_OBU_PARSER_H_