63 lines
2.0 KiB
C
63 lines
2.0 KiB
C
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/*
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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 "absl/types/optional.h"
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namespace rtc {
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class BitBuffer;
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}
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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 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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// Unpack RBSP and parse PPS state from the supplied buffer.
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static absl::optional<PpsState> ParsePps(const uint8_t* data, size_t length);
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static bool ParsePpsIds(const uint8_t* data,
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size_t length,
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uint32_t* pps_id,
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uint32_t* sps_id);
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static absl::optional<uint32_t> ParsePpsIdFromSlice(const uint8_t* data,
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size_t length);
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protected:
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// Parse the PPS state, for a bit buffer where RBSP decoding has already been
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// performed.
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static absl::optional<PpsState> ParseInternal(rtc::BitBuffer* bit_buffer);
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static bool ParsePpsIdsInternal(rtc::BitBuffer* bit_buffer,
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uint32_t* pps_id,
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uint32_t* sps_id);
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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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