Namespace inet::rtp

RtpHeader

class

This class represents an RTP data packet. Real data can either be encapsulated, or simulated by adding length.

The following RTP header fields exist but aren't used: padding, extension, csrcCount. The csrcList can't be used because csrcCount is always 0.

Extends

Name	Type	Description
FieldsChunk	(unknown -- not in documented files)

Fields

Name	Type	Description
chunkLength		12-byte fixed header
version	uint8_t	The rtp version of this RtpPacket.
paddingFlag	bool	Set to 1 if padding is used in this RtpPacket, 0 otherwise. This implementation doesn't use padding bytes, so it is always 0.
extensionFlag	bool	Set to 1, if this RtpPacket contains an rtp header extension, 0 otherwise. This implementation doesn't support rtp header extensions, so it is always 0.
marker	bool	The marker.
payloadType	int8_t	The type of payload carried in this RtpPacket.
sequenceNumber	uint16_t	The sequence number of this RtpPacket.
timeStamp	uint32_t	The rtp time stamp of this RtpPacket.
ssrc	uint32_t	The ssrc identifier of the creator of this RtpPacket.
csrc	uint32_t[]	no mixers, no contributing sources

Packet operations (observed)

action	module
insertAtFront	RtpAvProfilePayload32Sender
peekAtFront	Rtcp, Rtp, RtpAvProfile, RtpAvProfilePayload32Receiver
popAtFront	RtpAvProfilePayload32Receiver

Source code

//
// This class represents an RTP data packet. Real data can either
// be encapsulated, or simulated by adding length.
//
// The following RTP header fields exist but aren't used:
// padding, extension, csrcCount. The csrcList can't be used
// because csrcCount is always 0.
//
class RtpHeader extends FieldsChunk
{
    chunkLength = RTPPACKET_FIX_HEADERLENGTH;  // 12-byte fixed header

    // The rtp version of this ~RtpPacket.
    uint8_t version = 2;      // 2 bits

    // Set to 1 if padding is used in this ~RtpPacket, 0 otherwise.
    // This implementation doesn't use padding bytes, so it is always 0.
    bool paddingFlag = false;      // 1 bit

    // Set to 1, if this ~RtpPacket contains an rtp header extension, 0 otherwise.
    // This implementation doesn't support rtp header extensions, so it is always 0.
    bool extensionFlag = false;      // 1 bit

    // uint8_t cc;      // 4 bits, csrc count

    // The marker.
    bool marker = false;      // 1 bit

    // The type of payload carried in this ~RtpPacket.
    int8_t payloadType;      // 7 bits

    // The sequence number of this ~RtpPacket.
    uint16_t sequenceNumber;      // 16 bits

    // The rtp time stamp of this ~RtpPacket.
    uint32_t timeStamp;      // 32 bits

    // The ssrc identifier of the creator of this ~RtpPacket.
    uint32_t ssrc;      // 32 bits

    // no mixers, no contributing sources
    uint32_t csrc[];      // cc * 32 bits
}

File: src/inet/transportlayer/rtp/RtpPacket.msg