| /* |
| * 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_PPS_PARSER_H_ |
| #define WEBRTC_COMMON_VIDEO_H264_PPS_PARSER_H_ |
| |
| #include "webrtc/base/common.h" |
| #include "webrtc/base/optional.h" |
| |
| namespace rtc { |
| class BitBuffer; |
| } |
| |
| namespace webrtc { |
| |
| // A class for parsing out picture parameter set (PPS) data from a H264 NALU. |
| class PpsParser { |
| public: |
| // The parsed state of the PPS. Only some select values are stored. |
| // Add more as they are actually needed. |
| struct PpsState { |
| PpsState() = default; |
| |
| bool bottom_field_pic_order_in_frame_present_flag = false; |
| bool weighted_pred_flag = false; |
| uint32_t weighted_bipred_idc = false; |
| uint32_t redundant_pic_cnt_present_flag = 0; |
| int pic_init_qp_minus26 = 0; |
| uint32_t id = 0; |
| uint32_t sps_id = 0; |
| }; |
| |
| // Unpack RBSP and parse PPS state from the supplied buffer. |
| static rtc::Optional<PpsState> ParsePps(const uint8_t* data, size_t length); |
| |
| static bool ParsePpsIds(const uint8_t* data, |
| size_t length, |
| uint32_t* pps_id, |
| uint32_t* sps_id); |
| |
| static rtc::Optional<uint32_t> ParsePpsIdFromSlice(const uint8_t* data, |
| size_t length); |
| |
| protected: |
| // Parse the PPS state, for a bit buffer where RBSP decoding has already been |
| // performed. |
| static rtc::Optional<PpsState> ParseInternal(rtc::BitBuffer* bit_buffer); |
| static bool ParsePpsIdsInternal(rtc::BitBuffer* bit_buffer, |
| uint32_t* pps_id, |
| uint32_t* sps_id); |
| }; |
| |
| } // namespace webrtc |
| |
| #endif // WEBRTC_COMMON_VIDEO_H264_PPS_PARSER_H_ |