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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 <optional>
#include <vector>
#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;
std::optional<int> GetLastSliceQp() const override;
std::optional<uint32_t> GetLastSlicePpsId() const;
static std::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.
std::optional<int32_t> last_slice_qp_delta_;
std::optional<uint32_t> last_slice_pps_id_;
};
} // namespace webrtc
#endif // COMMON_VIDEO_H265_H265_BITSTREAM_PARSER_H_