8037fc6ffa
Bug: webrtc:342905193 No-Try: True Change-Id: Icc968be43b8830038ea9a1f5f604307220457807 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/361021 Auto-Submit: Florent Castelli <orphis@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Florent Castelli <orphis@webrtc.org> Cr-Commit-Position: refs/heads/main@{#42911}
82 lines
2.9 KiB
C++
82 lines
2.9 KiB
C++
/*
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* Copyright (c) 2023 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef COMMON_VIDEO_H265_H265_PPS_PARSER_H_
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#define COMMON_VIDEO_H265_H265_PPS_PARSER_H_
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#include <optional>
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#include "api/array_view.h"
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#include "common_video/h265/h265_sps_parser.h"
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#include "rtc_base/bitstream_reader.h"
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#include "rtc_base/system/rtc_export.h"
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namespace webrtc {
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// A class for parsing out picture parameter set (PPS) data from a H265 NALU.
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class RTC_EXPORT H265PpsParser {
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public:
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// The parsed state of the PPS. Only some select values are stored.
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// Add more as they are actually needed.
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struct PpsState {
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PpsState() = default;
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bool dependent_slice_segments_enabled_flag = false;
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bool cabac_init_present_flag = false;
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bool output_flag_present_flag = false;
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uint32_t num_extra_slice_header_bits = 0;
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uint32_t num_ref_idx_l0_default_active_minus1 = 0;
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uint32_t num_ref_idx_l1_default_active_minus1 = 0;
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int init_qp_minus26 = 0;
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bool weighted_pred_flag = false;
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bool weighted_bipred_flag = false;
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bool lists_modification_present_flag = false;
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uint32_t pps_id = 0;
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uint32_t sps_id = 0;
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int qp_bd_offset_y = 0;
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};
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// Unpack RBSP and parse PPS state from the supplied buffer.
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static std::optional<PpsState> ParsePps(rtc::ArrayView<const uint8_t> data,
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const H265SpsParser::SpsState* sps);
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// TODO: bugs.webrtc.org/42225170 - Deprecate.
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static inline std::optional<PpsState> ParsePps(
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const uint8_t* data,
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size_t length,
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const H265SpsParser::SpsState* sps) {
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return ParsePps(rtc::MakeArrayView(data, length), sps);
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}
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static bool ParsePpsIds(rtc::ArrayView<const uint8_t> data,
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uint32_t* pps_id,
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uint32_t* sps_id);
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// TODO: bugs.webrtc.org/42225170 - Deprecate.
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static inline bool ParsePpsIds(const uint8_t* data,
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size_t length,
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uint32_t* pps_id,
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uint32_t* sps_id) {
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return ParsePpsIds(rtc::MakeArrayView(data, length), pps_id, sps_id);
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}
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protected:
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// Parse the PPS state, for a bit buffer where RBSP decoding has already been
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// performed.
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static std::optional<PpsState> ParseInternal(
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rtc::ArrayView<const uint8_t> buffer,
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const H265SpsParser::SpsState* sps);
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static bool ParsePpsIdsInternal(BitstreamReader& reader,
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uint32_t& pps_id,
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uint32_t& sps_id);
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};
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} // namespace webrtc
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#endif // COMMON_VIDEO_H265_H265_PPS_PARSER_H_
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