87 lines
2.9 KiB
C++
87 lines
2.9 KiB
C++
/*
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* Copyright (c) 2018 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_SPS_PARSER_H_
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#define COMMON_VIDEO_H265_H265_SPS_PARSER_H_
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#include <vector>
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#include "absl/types/optional.h"
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namespace rtc {
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class BitBuffer;
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}
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namespace webrtc {
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// A class for parsing out sequence parameter set (SPS) data from an H265 NALU.
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class H265SpsParser {
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public:
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struct ShortTermRefPicSet {
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ShortTermRefPicSet();
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uint32_t inter_ref_pic_set_prediction_flag = 0;
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std::vector<uint32_t> used_by_curr_pic_flag;
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std::vector<uint32_t> use_delta_flag;
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uint32_t num_negative_pics = 0;
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uint32_t num_positive_pics = 0;
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std::vector<uint32_t> delta_poc_s0_minus1;
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std::vector<uint32_t> used_by_curr_pic_s0_flag;
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std::vector<uint32_t> delta_poc_s1_minus1;
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std::vector<uint32_t> used_by_curr_pic_s1_flag;
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};
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// The parsed state of the SPS. Only some select values are stored.
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// Add more as they are actually needed.
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struct SpsState {
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SpsState();
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uint32_t sps_max_sub_layers_minus1;
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uint32_t chroma_format_idc = 0;
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uint32_t separate_colour_plane_flag = 0;
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uint32_t pic_width_in_luma_samples = 0;
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uint32_t pic_height_in_luma_samples = 0;
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uint32_t log2_max_pic_order_cnt_lsb_minus4 = 0;
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std::vector<uint32_t> sps_max_dec_pic_buffering_minus1;
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uint32_t log2_min_luma_coding_block_size_minus3 = 0;
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uint32_t log2_diff_max_min_luma_coding_block_size = 0;
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uint32_t sample_adaptive_offset_enabled_flag = 0;
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uint32_t num_short_term_ref_pic_sets = 0;
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std::vector<H265SpsParser::ShortTermRefPicSet> short_term_ref_pic_set;
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uint32_t long_term_ref_pics_present_flag = 0;
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uint32_t num_long_term_ref_pics_sps = 0;
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std::vector<uint32_t> used_by_curr_pic_lt_sps_flag;
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uint32_t sps_temporal_mvp_enabled_flag = 0;
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uint32_t width = 0;
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uint32_t height = 0;
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uint32_t id = 0;
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uint32_t vps_id = 0;
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};
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// Unpack RBSP and parse SPS state from the supplied buffer.
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static absl::optional<SpsState> ParseSps(const uint8_t* data, size_t length);
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static bool ParseScalingListData(rtc::BitBuffer* buffer);
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static absl::optional<ShortTermRefPicSet> ParseShortTermRefPicSet(
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uint32_t st_rps_idx, uint32_t num_short_term_ref_pic_sets,
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const std::vector<ShortTermRefPicSet>& ref_pic_sets,
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SpsState& sps, rtc::BitBuffer* buffer);
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protected:
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// Parse the SPS state, for a bit buffer where RBSP decoding has already been
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// performed.
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static absl::optional<SpsState> ParseSpsInternal(rtc::BitBuffer* buffer);
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};
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} // namespace webrtc
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#endif // COMMON_VIDEO_H265_H265_SPS_PARSER_H_
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