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}
75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
/*
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* Copyright (c) 2016 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_H264_PPS_PARSER_H_
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#define COMMON_VIDEO_H264_PPS_PARSER_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <optional>
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#include "api/array_view.h"
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namespace webrtc {
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// A class for parsing out picture parameter set (PPS) data from a H264 NALU.
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class PpsParser {
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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 bottom_field_pic_order_in_frame_present_flag = false;
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bool weighted_pred_flag = false;
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bool entropy_coding_mode_flag = false;
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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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uint32_t weighted_bipred_idc = false;
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uint32_t redundant_pic_cnt_present_flag = 0;
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int pic_init_qp_minus26 = 0;
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uint32_t id = 0;
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uint32_t sps_id = 0;
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};
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struct SliceHeader {
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SliceHeader() = default;
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uint32_t first_mb_in_slice = 0;
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uint32_t pic_parameter_set_id = 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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// TODO: bugs.webrtc.org/42225170 - Deprecate.
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static inline std::optional<PpsState> ParsePps(const uint8_t* data,
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size_t length) {
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return ParsePps(rtc::MakeArrayView(data, length));
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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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static std::optional<SliceHeader> ParseSliceHeader(
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rtc::ArrayView<const uint8_t> data);
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protected:
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// Parse the PPS state, for a 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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};
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} // namespace webrtc
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#endif // COMMON_VIDEO_H264_PPS_PARSER_H_
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