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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 WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_TRANSPORT_FEEDBACK_H_
#define WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_TRANSPORT_FEEDBACK_H_
#include <deque>
#include <vector>
#include "webrtc/base/constructormagic.h"
#include "webrtc/modules/include/module_common_types.h"
#include "webrtc/modules/rtp_rtcp/source/rtcp_packet.h"
namespace webrtc {
namespace rtcp {
class PacketStatusChunk;
class TransportFeedback : public RtcpPacket {
public:
TransportFeedback();
virtual ~TransportFeedback();
void WithPacketSenderSsrc(uint32_t ssrc);
void WithMediaSourceSsrc(uint32_t ssrc);
void WithBase(uint16_t base_sequence, // Seq# of first packet in this msg.
int64_t ref_timestamp_us); // Reference timestamp for this msg.
void WithFeedbackSequenceNumber(uint8_t feedback_sequence);
// NOTE: This method requires increasing sequence numbers (excepting wraps).
bool WithReceivedPacket(uint16_t sequence_number, int64_t timestamp_us);
enum class StatusSymbol {
kNotReceived,
kReceivedSmallDelta,
kReceivedLargeDelta,
};
uint16_t GetBaseSequence() const;
std::vector<TransportFeedback::StatusSymbol> GetStatusVector() const;
std::vector<int16_t> GetReceiveDeltas() const;
// Get the reference time in microseconds, including any precision loss.
int64_t GetBaseTimeUs() const;
// Convenience method for getting all deltas as microseconds. The first delta
// is relative the base time.
std::vector<int64_t> GetReceiveDeltasUs() const;
uint32_t GetPacketSenderSsrc() const;
uint32_t GetMediaSourceSsrc() const;
static const int kDeltaScaleFactor = 250; // Convert to multiples of 0.25ms.
static const uint8_t kFeedbackMessageType = 15; // TODO(sprang): IANA reg?
static const uint8_t kPayloadType = 205; // RTPFB, see RFC4585.
static rtc::scoped_ptr<TransportFeedback> ParseFrom(const uint8_t* buffer,
size_t length);
protected:
bool Create(uint8_t* packet,
size_t* position,
size_t max_length,
PacketReadyCallback* callback) const override;
size_t BlockLength() const override;
private:
static PacketStatusChunk* ParseChunk(const uint8_t* buffer, size_t max_size);
int64_t Unwrap(uint16_t sequence_number);
bool AddSymbol(StatusSymbol symbol, int64_t seq);
bool Encode(StatusSymbol symbol);
bool HandleRleCandidate(StatusSymbol symbol,
int current_capacity,
int delta_size);
void EmitRemaining();
void EmitVectorChunk();
void EmitRunLengthChunk();
uint32_t packet_sender_ssrc_;
uint32_t media_source_ssrc_;
int32_t base_seq_;
int64_t base_time_;
uint8_t feedback_seq_;
std::vector<PacketStatusChunk*> status_chunks_;
std::vector<int16_t> receive_deltas_;
int64_t last_seq_;
int64_t last_timestamp_;
std::deque<StatusSymbol> symbol_vec_;
uint16_t first_symbol_cardinality_;
bool vec_needs_two_bit_symbols_;
uint32_t size_bytes_;
RTC_DISALLOW_COPY_AND_ASSIGN(TransportFeedback);
};
} // namespace rtcp
} // namespace webrtc
#endif // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_TRANSPORT_FEEDBACK_H_
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