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/*
* 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.
*/
#ifndef COMMON_VIDEO_H265_H265_PPS_PARSER_H_
#define COMMON_VIDEO_H265_H265_PPS_PARSER_H_
#include "absl/types/optional.h"
#include "api/array_view.h"
#include "common_video/h265/h265_sps_parser.h"
#include "rtc_base/bitstream_reader.h"
namespace webrtc {
// A class for parsing out picture parameter set (PPS) data from a H265 NALU.
class H265PpsParser {
public:
// The parsed state of the PPS. Only some select values are stored.
// Add more as they are actually needed.
struct PpsState {
PpsState() = default;
bool dependent_slice_segments_enabled_flag = false;
bool cabac_init_present_flag = false;
bool output_flag_present_flag = false;
uint32_t num_extra_slice_header_bits = 0;
uint32_t num_ref_idx_l0_default_active_minus1 = 0;
uint32_t num_ref_idx_l1_default_active_minus1 = 0;
int init_qp_minus26 = 0;
bool weighted_pred_flag = false;
bool weighted_bipred_flag = false;
bool lists_modification_present_flag = false;
uint32_t pps_id = 0;
uint32_t sps_id = 0;
int qp_bd_offset_y = 0;
};
// Unpack RBSP and parse PPS state from the supplied buffer.
static absl::optional<PpsState> ParsePps(const uint8_t* data,
size_t length,
const H265SpsParser::SpsState* sps);
static bool ParsePpsIds(const uint8_t* data,
size_t length,
uint32_t* pps_id,
uint32_t* sps_id);
protected:
// Parse the PPS state, for a bit buffer where RBSP decoding has already been
// performed.
static absl::optional<PpsState> ParseInternal(
rtc::ArrayView<const uint8_t> buffer,
const H265SpsParser::SpsState* sps);
static bool ParsePpsIdsInternal(BitstreamReader& reader,
uint32_t& pps_id,
uint32_t& sps_id);
};
} // namespace webrtc
#endif // COMMON_VIDEO_H265_H265_PPS_PARSER_H_
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