---
name: "RTCPCompoundHandler_NACKPacket"
section: "3"
platform: "linux"
package: "libccrtp-doc"
version: "2.0.9-4.1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/RTCPCompoundHandler_NACKPacket"
---

# RTCPCompoundHandler\_NACKPacket(3)

Struct for Negative ACKnowledgements (NACK) RTCP packet.

## NAME

RTCPCompoundHandler::NACKPacket - Struct for Negative ACKnowledgements (NACK) RTCP packet.

## SYNOPSIS

`#include <rtcppkt.h>`

### Public Attributes

uint32 **ssrc**\
 ssrc identifier of source.  uint16 **fsn**\
 First Sequence Number lost.  uint16 **blp**\
 Bitmask of following Lost Packets.

## Detailed Description

Struct for Negative ACKnowledgements (NACK) RTCP packet.

Specific for H.261 sessions (see RFC 2032).

## Member Data Documentation

### uint16 RTCPCompoundHandler::NACKPacket::blp

Bitmask of following Lost Packets.

### uint16 RTCPCompoundHandler::NACKPacket::fsn

First Sequence Number lost.

### uint32 RTCPCompoundHandler::NACKPacket::ssrc

ssrc identifier of source.

## Author

Generated automatically by Doxygen for ccRTP from the source code.