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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// Tracks information about an FEC group, including the packets
// that have been seen, and the running parity. Provides the ability
// to revive a dropped packet.
#ifndef NET_QUIC_QUIC_FEC_GROUP_H_
#define NET_QUIC_QUIC_FEC_GROUP_H_
#include <cstddef>
#include "base/strings/string_piece.h"
#include "net/quic/quic_fec_group_interface.h"
#include "net/quic/quic_protocol.h"
namespace net {
class NET_EXPORT_PRIVATE QuicFecGroup : public QuicFecGroupInterface {
public:
explicit QuicFecGroup(QuicPacketNumber fec_group_number);
virtual ~QuicFecGroup();
// Implementation of QuicFecGroupInterface.
bool Update(EncryptionLevel encryption_level,
const QuicPacketHeader& header,
base::StringPiece decrypted_payload) override;
bool UpdateFec(EncryptionLevel encryption_level,
const QuicPacketHeader& header,
base::StringPiece redundancy) override;
bool CanRevive() const override;
bool IsFinished() const override;
size_t Revive(QuicPacketHeader* header,
char* decrypted_payload,
size_t decrypted_payload_len) override;
bool IsWaitingForPacketBefore(QuicPacketNumber num) const override;
const base::StringPiece PayloadParity() const override;
QuicPacketCount NumReceivedPackets() const override;
EncryptionLevel EffectiveEncryptionLevel() const override;
QuicFecGroupNumber FecGroupNumber() const override;
private:
bool UpdateParity(base::StringPiece payload);
// Returns the number of missing packets, or QuicPacketCount max
// if the number of missing packets is not known.
QuicPacketCount NumMissingPackets() const;
bool has_received_fec_packet() const {
return max_protected_packet_ != kInvalidPacketNumber;
}
// Set of packets that we have recevied.
PacketNumberSet received_packets_;
// packet number of the first protected packet in this group (the one
// with the lowest packet number). Will only be set once the FEC
// packet has been seen.
const QuicPacketNumber min_protected_packet_;
// packet number of the last protected packet in this group (the one
// with the highest packet number). Will only be set once the FEC
// packet has been seen.
QuicPacketNumber max_protected_packet_;
// The cumulative parity calculation of all received packets.
char payload_parity_[kMaxPacketSize];
size_t payload_parity_len_;
// The effective encryption level, which is the lowest encryption level of
// the data and FEC in the group.
EncryptionLevel effective_encryption_level_;
DISALLOW_COPY_AND_ASSIGN(QuicFecGroup);
};
} // namespace net
#endif // NET_QUIC_QUIC_FEC_GROUP_H_
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