blob: 48f27ef2e7dae8ad91769f0d435bebbe8d34ef90 [file] [log] [blame]
* 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.
#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 {
~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(
const uint8_t* data,
size_t length,
uint8_t nalu_type);
enum Result {
void ParseSlice(const uint8_t* slice, size_t length);
Result ParseNonParameterSetNalu(const uint8_t* source,
size_t source_length,
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