| /* |
| * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #ifndef WEBRTC_COMMON_VIDEO_H264_SPS_PARSER_H_ |
| #define WEBRTC_COMMON_VIDEO_H264_SPS_PARSER_H_ |
| |
| #include "webrtc/base/common.h" |
| #include "webrtc/base/optional.h" |
| |
| namespace rtc { |
| class BitBuffer; |
| } |
| |
| namespace webrtc { |
| |
| // A class for parsing out sequence parameter set (SPS) data from an H264 NALU. |
| class SpsParser { |
| public: |
| // The parsed state of the SPS. Only some select values are stored. |
| // Add more as they are actually needed. |
| struct SpsState { |
| SpsState() = default; |
| |
| uint32_t width = 0; |
| uint32_t height = 0; |
| uint32_t delta_pic_order_always_zero_flag = 0; |
| uint32_t separate_colour_plane_flag = 0; |
| uint32_t frame_mbs_only_flag = 0; |
| uint32_t log2_max_frame_num_minus4 = 0; |
| uint32_t log2_max_pic_order_cnt_lsb_minus4 = 0; |
| uint32_t pic_order_cnt_type = 0; |
| uint32_t max_num_ref_frames = 0; |
| uint32_t vui_params_present = 0; |
| uint32_t id = 0; |
| }; |
| |
| // Unpack RBSP and parse SPS state from the supplied buffer. |
| static rtc::Optional<SpsState> ParseSps(const uint8_t* data, size_t length); |
| |
| protected: |
| // Parse the SPS state, up till the VUI part, for a bit buffer where RBSP |
| // decoding has already been performed. |
| static rtc::Optional<SpsState> ParseSpsUpToVui(rtc::BitBuffer* buffer); |
| }; |
| |
| } // namespace webrtc |
| #endif // WEBRTC_COMMON_VIDEO_H264_SPS_PARSER_H_ |