h265_bitstream_parser.h

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/*

 *  Copyright (c) 2023 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 COMMON_VIDEO_H265_H265_BITSTREAM_PARSER_H_

#define COMMON_VIDEO_H265_H265_BITSTREAM_PARSER_H_

#include <stddef.h>

#include <stdint.h>

#include <vector>

#include "absl/types/optional.h"

#include "api/video_codecs/bitstream_parser.h"

#include "common_video/h265/h265_pps_parser.h"

#include "common_video/h265/h265_sps_parser.h"

#include "common_video/h265/h265_vps_parser.h"

#include "rtc_base/containers/flat_map.h"

#include "rtc_base/system/rtc_export.h"

namespace webrtc {

// Stateful H265 bitstream parser (due to VPS/SPS/PPS). Used to parse out QP

// values from the bitstream.

class RTC_EXPORT H265BitstreamParser : public BitstreamParser {

 public:

  H265BitstreamParser();

  ~H265BitstreamParser() override;

  // New interface.

  void ParseBitstream(rtc::ArrayView<const uint8_t> bitstream) override;

  absl::optional<int> GetLastSliceQp() const override;

  absl::optional<uint32_t> GetLastSlicePpsId() const;

  static absl::optional<uint32_t> ParsePpsIdFromSliceSegmentLayerRbsp(

      rtc::ArrayView<const uint8_t> data,

      uint8_t nalu_type);

 protected:

  enum Result {

    kOk,

    kInvalidStream,

    kUnsupportedStream,

};

  void ParseSlice(rtc::ArrayView<const uint8_t> slice);

  Result ParseNonParameterSetNalu(rtc::ArrayView<const uint8_t> source,

                                  uint8_t nalu_type);

  const H265PpsParser::PpsState* GetPPS(uint32_t id) const;

  const H265SpsParser::SpsState* GetSPS(uint32_t id) const;

  // VPS/SPS/PPS state, updated when parsing new VPS/SPS/PPS, used to parse

  // slices.

  flat_map<uint32_t, H265VpsParser::VpsState> vps_;

  flat_map<uint32_t, H265SpsParser::SpsState> sps_;

  flat_map<uint32_t, H265PpsParser::PpsState> pps_;

  // Last parsed slice QP.

  absl::optional<int32_t> last_slice_qp_delta_;

  absl::optional<uint32_t> last_slice_pps_id_;

};

}  // namespace webrtc

#endif  // COMMON_VIDEO_H265_H265_BITSTREAM_PARSER_H_