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/*
* Copyright (c) 2015 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_H264_H264_BITSTREAM_PARSER_H_
#define COMMON_VIDEO_H264_H264_BITSTREAM_PARSER_H_
#include <stddef.h>
#include <stdint.h>
#include <optional>
#include "api/video_codecs/bitstream_parser.h"
#include "common_video/h264/pps_parser.h"
#include "common_video/h264/sps_parser.h"
namespace webrtc {
// Stateful H264 bitstream parser (due to SPS/PPS). Used to parse out QP values
// from the bitstream.
// TODO(pbos): Unify with RTP SPS parsing and only use one H264 parser.
// TODO(pbos): If/when this gets used on the receiver side CHECKs must be
// removed and gracefully abort as we have no control over receive-side
// bitstreams.
class H264BitstreamParser : public BitstreamParser {
public:
H264BitstreamParser();
~H264BitstreamParser() override;
void ParseBitstream(rtc::ArrayView<const uint8_t> bitstream) override;
std::optional<int> GetLastSliceQp() const override;
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);
// SPS/PPS state, updated when parsing new SPS/PPS, used to parse slices.
std::optional<SpsParser::SpsState> sps_;
std::optional<PpsParser::PpsState> pps_;
// Last parsed slice QP.
std::optional<int32_t> last_slice_qp_delta_;
};
} // namespace webrtc
#endif // COMMON_VIDEO_H264_H264_BITSTREAM_PARSER_H_