h265_vps_parser.h (1601B)
1 /* 2 * Copyright (c) 2023 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef COMMON_VIDEO_H265_H265_VPS_PARSER_H_ 12 #define COMMON_VIDEO_H265_H265_VPS_PARSER_H_ 13 14 #include <cstddef> 15 #include <cstdint> 16 #include <optional> 17 18 #include "api/array_view.h" 19 #include "rtc_base/system/rtc_export.h" 20 21 namespace webrtc { 22 23 // A class for parsing out video parameter set (VPS) data from an H265 NALU. 24 class RTC_EXPORT H265VpsParser { 25 public: 26 // The parsed state of the VPS. Only some select values are stored. 27 // Add more as they are actually needed. 28 struct RTC_EXPORT VpsState { 29 VpsState(); 30 31 uint32_t id = 0; 32 }; 33 34 // Unpack RBSP and parse VPS state from the supplied buffer. 35 static std::optional<VpsState> ParseVps(ArrayView<const uint8_t> data); 36 // TODO: bugs.webrtc.org/42225170 - Deprecate. 37 static inline std::optional<VpsState> ParseVps(const uint8_t* data, 38 size_t length) { 39 return ParseVps(MakeArrayView(data, length)); 40 } 41 42 protected: 43 // Parse the VPS state, for a bit buffer where RBSP decoding has already been 44 // performed. 45 static std::optional<VpsState> ParseInternal(ArrayView<const uint8_t> buffer); 46 }; 47 48 } // namespace webrtc 49 #endif // COMMON_VIDEO_H265_H265_VPS_PARSER_H_