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// Copyright (c) 2016 The WebM 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 SRC_BLOCK_HEADER_PARSER_H_
#define SRC_BLOCK_HEADER_PARSER_H_
#include <cassert>
#include <cstdint>
#include "src/parser.h"
#include "src/var_int_parser.h"
#include "webm/callback.h"
#include "webm/reader.h"
#include "webm/status.h"
namespace webm {
struct BlockHeader {
std::uint64_t track_number;
std::int16_t timecode;
std::uint8_t flags;
bool operator==(const BlockHeader& other) const {
return track_number == other.track_number && timecode == other.timecode &&
flags == other.flags;
}
};
class BlockHeaderParser : public Parser {
public:
Status Feed(Callback* callback, Reader* reader,
std::uint64_t* num_bytes_read) override;
// Gets the parsed block header information. This must not be called until the
// parse has been successfully completed.
const BlockHeader& value() const {
assert(state_ == State::kDone);
return value_;
}
private:
BlockHeader value_;
VarIntParser uint_parser_;
int timecode_bytes_remaining_ = 2;
enum class State {
/* clang-format off */
// State Transitions to state When
kReadingTrackNumber, // kReadingTimecode track parsed
kReadingTimecode, // kReadingFlags timecode parsed
kReadingFlags, // kDone flags parsed
kDone, // No transitions from here (must call Init)
/* clang-format on */
} state_ = State::kReadingTrackNumber;
};
} // namespace webm
#endif // SRC_BLOCK_HEADER_PARSER_H_
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