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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_NACK_H_
#define WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_NACK_H_
#include <vector>
#include "webrtc/base/basictypes.h"
#include "webrtc/modules/rtp_rtcp/source/rtcp_packet/rtpfb.h"
#include "webrtc/modules/rtp_rtcp/source/rtcp_utility.h"
namespace webrtc {
namespace rtcp {
class Nack : public Rtpfb {
public:
const uint8_t kFeedbackMessageType = 1;
Nack() {}
virtual ~Nack() {}
// Parse assumes header is already parsed and validated.
bool Parse(const RTCPUtility::RtcpCommonHeader& header,
const uint8_t* payload); // Size of the payload is in the header.
void WithList(const uint16_t* nack_list, size_t length);
const std::vector<uint16_t>& packet_ids() const { return packet_ids_; }
protected:
bool Create(uint8_t* packet,
size_t* index,
size_t max_length,
RtcpPacket::PacketReadyCallback* callback) const override;
size_t BlockLength() const override;
private:
const size_t kNackItemLength = 4;
struct PackedNack {
uint16_t first_pid;
uint16_t bitmask;
};
void Pack(); // Fills packed_ using packed_ids_. (used in WithList).
void Unpack(); // Fills packet_ids_ using packed_. (used in Parse).
std::vector<PackedNack> packed_;
std::vector<uint16_t> packet_ids_;
RTC_DISALLOW_COPY_AND_ASSIGN(Nack);
};
} // namespace rtcp
} // namespace webrtc
#endif // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_NACK_H_
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