72 lines
2.6 KiB
C
72 lines
2.6 KiB
C
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/*
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* Copyright (c) 2015 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_H265_H265_BITSTREAM_PARSER_H_
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#define COMMON_VIDEO_H265_H265_BITSTREAM_PARSER_H_
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#include <stddef.h>
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#include <stdint.h>
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#include "absl/types/optional.h"
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#include "api/video_codecs/bitstream_parser.h"
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#include "common_video/h265/h265_pps_parser.h"
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#include "common_video/h265/h265_sps_parser.h"
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namespace webrtc {
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// Stateful H265 bitstream parser (due to SPS/PPS). Used to parse out QP values
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// from the bitstream.
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// TODO(pbos): Unify with RTP SPS parsing and only use one H265 parser.
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// TODO(pbos): If/when this gets used on the receiver side CHECKs must be
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// removed and gracefully abort as we have no control over receive-side
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// bitstreams.
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class H265BitstreamParser : public BitstreamParser {
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public:
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H265BitstreamParser();
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~H265BitstreamParser() override;
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// These are here for backwards-compatability for the time being.
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void ParseBitstream(const uint8_t* bitstream, size_t length);
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bool GetLastSliceQp(int* qp) const;
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// New interface.
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void ParseBitstream(rtc::ArrayView<const uint8_t> bitstream) override;
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absl::optional<int> GetLastSliceQp() const override;
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protected:
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enum Result {
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kOk,
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kInvalidStream,
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kUnsupportedStream,
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};
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void ParseSlice(const uint8_t* slice, size_t length);
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Result ParseNonParameterSetNalu(const uint8_t* source,
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size_t source_length,
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uint8_t nalu_type);
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uint32_t CalcNumPocTotalCurr(uint32_t num_long_term_sps,
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uint32_t num_long_term_pics,
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const std::vector<uint32_t> lt_idx_sps,
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const std::vector<uint32_t> used_by_curr_pic_lt_flag,
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uint32_t short_term_ref_pic_set_sps_flag,
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uint32_t short_term_ref_pic_set_idx,
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const H265SpsParser::ShortTermRefPicSet& short_term_ref_pic_set);
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// SPS/PPS state, updated when parsing new SPS/PPS, used to parse slices.
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absl::optional<H265SpsParser::SpsState> sps_;
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absl::optional<H265PpsParser::PpsState> pps_;
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// Last parsed slice QP.
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absl::optional<int32_t> last_slice_qp_delta_;
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};
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} // namespace webrtc
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#endif // COMMON_VIDEO_H265_H265_BITSTREAM_PARSER_H_
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