45e5e385f3
No-Try: true Bug: webrtc:42225170 Change-Id: I4682f400054fee5c86ea24bebf6d703fb90074da Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/354722 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Ilya Nikolaevskiy <ilnik@webrtc.org> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Reviewed-by: Sergey Silkin <ssilkin@webrtc.org> Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org> Reviewed-by: Erik Språng <sprang@webrtc.org> Cr-Commit-Position: refs/heads/main@{#42650}
60 lines
2.1 KiB
C++
60 lines
2.1 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_SPS_PARSER_H_
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#define COMMON_VIDEO_H264_SPS_PARSER_H_
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#include "absl/types/optional.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 sequence parameter set (SPS) data from an H264 NALU.
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class RTC_EXPORT SpsParser {
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public:
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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 RTC_EXPORT SpsState {
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SpsState();
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SpsState(const SpsState&);
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~SpsState();
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uint32_t width = 0;
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uint32_t height = 0;
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uint32_t delta_pic_order_always_zero_flag = 0;
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uint32_t chroma_format_idc = 1;
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uint32_t separate_colour_plane_flag = 0;
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uint32_t frame_mbs_only_flag = 0;
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uint32_t log2_max_frame_num = 4; // Smallest valid value.
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uint32_t log2_max_pic_order_cnt_lsb = 4; // Smallest valid value.
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uint32_t pic_order_cnt_type = 0;
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uint32_t max_num_ref_frames = 0;
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uint32_t vui_params_present = 0;
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uint32_t 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(rtc::ArrayView<const uint8_t> data);
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// TODO: bugs.webrtc.org/42225170 - Deprecate.
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static inline absl::optional<SpsState> ParseSps(const uint8_t* data,
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size_t length) {
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return ParseSps(rtc::MakeArrayView(data, length));
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}
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protected:
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// Parse the SPS state, up till the VUI part, for a buffer where RBSP
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// decoding has already been performed.
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static absl::optional<SpsState> ParseSpsUpToVui(BitstreamReader& reader);
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};
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} // namespace webrtc
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#endif // COMMON_VIDEO_H264_SPS_PARSER_H_
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