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OutgoingRTPPkt(3) Library Functions Manual OutgoingRTPPkt(3)

NAME

OutgoingRTPPkt - RTP packets being sent.

SYNOPSIS

#include <rtppkt.h>

Inherits RTPPacket.

Public Member Functions


OutgoingRTPPkt (const uint32 *const csrcs, uint16 numcsrc, const unsigned char *const hdrext, uint32 hdrextlen, const unsigned char *const data, size_t datalen, uint8 paddinglen=0, CryptoContext *pcc=NULL)
Construct a new packet to be sent, containing several contributing source identifiers, header extensions and payload. OutgoingRTPPkt (const uint32 *const csrcs, uint16 numcsrc, const unsigned char *const data, size_t datalen, uint8 paddinglen=0, CryptoContext *pcc=NULL)
Construct a new packet to be sent, containing several contributing source identifiers and payload. OutgoingRTPPkt (const unsigned char *const data, size_t datalen, uint8 paddinglen=0, CryptoContext *pcc=NULL)
Construct a new packet (fast variant, with no contributing sources and no header extension) to be sent. ~OutgoingRTPPkt ()
void setPayloadType (PayloadType pt)
void setSeqNum (uint16 seq)
void setTimestamp (uint32 pts)
void setSSRC (uint32 ssrc) const
Set synchronization source numeric identifier. void setSSRCNetwork (uint32 ssrc) const
Set synchronization source numeric identifier. void setMarker (bool mark)
Specify the value of the marker bit. void protect (uint32 ssrc, CryptoContext *pcc)
Called packet is setup. bool operator== (const OutgoingRTPPkt &p) const
Outgoing packets are equal if their sequence numbers match. bool operator!= (const OutgoingRTPPkt &p) const
Outgoing packets are not equal if their sequence numbers differ.

Public Member Functions inherited from RTPPacket
RTPPacket (const unsigned char *const block, size_t len, bool duplicate=false)
Constructor, construct a packet object given the memory zone its content (header and payload) is stored. RTPPacket (size_t hdrlen, size_t plen, uint8 paddinglen, CryptoContext *pcc=NULL)
Construct a packet object without specifying its real content yet. uint32 getHeaderSize () const
Get the length of the header, including contributing sources identifiers and header extension, if present. const uint8 *const getPayload () const
uint32 getPayloadSize () const
PayloadType getPayloadType () const
uint16 getSeqNum () const
uint32 getTimestamp () const
uint8 getProtocolVersion () const
bool isPadded () const
Ask whether the packet contains padding bytes at the end. uint8 getPaddingSize () const
Get the number of octets padding the end of the payload section. bool isMarked () const
Ask whether the packet is marked (for isntance, is a new talk spurt in some audio profiles). bool isExtended () const
Ask whether the packet contains header extensions. uint16 getCSRCsCount () const
Get the number of contributing sources specified in the packet header. const uint32 * getCSRCs () const
Get the 32-bit identifiers of the contributing sources for the packet as an array, of length getCSRCsCount(). uint16 getHdrExtUndefined () const
Get the first 16 bits (in network order) of the header of the RTP header extension. uint32 getHdrExtSize () const
Get the length (in octets) of the data contained in the header extension. const unsigned char * getHdrExtContent () const
Get the content of the header extension. const unsigned char *const getRawPacket () const
Get the raw packet as it will be sent through the network. uint32 getRawPacketSize () const
Get the raw packet length, including header, extension, payload and padding. uint32 getRawPacketSizeSrtp () const
size_t getSizeOfFixedHeader () const
void reComputePayLength (bool padding)
Re-compute payload length. struct RFC2833Payload * getRaw2833Payload (void)
Fetch a raw 2833 packet. uint16 get2833Duration (void)
Fetch 2833 duration field. void set2833Duration (uint16 timestamp)
Set 2833 duration field.

Additional Inherited Members

Protected Member Functions inherited from RTPPacket
virtual ~RTPPacket ()
Destructor, free the buffer provided in the constructor. void endPacket ()
Free memory allocated for the packet. RTPFixedHeader * getHeader () const
Return low level structure for the header of the packet. void setExtension (bool e)
const RTPHeaderExt * getHeaderExt () const
Get a pointer to RTPHeaderExt pointing after the RTP header (fixed part plus contributing sources). uint32 getRawTimestamp () const
Obtain the absolute timestamp carried in the packet header. void setbuffer (const void *src, size_t len, size_t pos)

Protected Attributes inherited from RTPPacket
uint16 cachedSeqNum
Packet sequence number in host order. uint32 cachedTimestamp
Packet timestamp in host order (includes initial shift). uint32 srtpDataOffset
Offset into packet memory pointing to area for SRTP data. int32 srtpLength
Lebgth of additional SRTP data. uint32 total
total length, including header, payload and padding uint32 payloadSize
note: payload (not full packet) size.

Detailed Description

RTP packets being sent.

This class is intented to construct packet objects just before they are inserted into the sending queue, so that they are processed in a understandable and format independent manner inside the stack.

Author

Federico Montesino Pouzols fedemp@altern.org

Constructor & Destructor Documentation

OutgoingRTPPkt::OutgoingRTPPkt (const uint32 *const csrcs, uint16 numcsrc, const unsigned char *const hdrext, uint32 hdrextlen, const unsigned char *const data, size_t datalen, uint8 paddinglen = 0, CryptoContext * pcc = NULL)

Construct a new packet to be sent, containing several contributing source identifiers, header extensions and payload.

A new copy in memory (holding all this components


along with the fixed header) is created. If the pointer to the SRTP CryptoContext is not NULL and holds a CryptoContext for the SSRC take the SSRC data into account when computing the required memory buffer.

Parameters

csrcs array of countributing source 32-bit identifiers, in host order.
numcsrc number of CSRC identifiers in the array.
hdrext whole header extension.
hdrextlen size of whole header extension, in octets.
data payload.
datalen payload length, in octets.
paddinglen pad packet to a multiple of paddinglen.
pcc Pointer to the SRTP CryptoContext, defaults to NULL if not specified.

Note

For efficiency purposes, since this constructor is valid for all packets but is too complex for the common case, two simpler others are provided.

OutgoingRTPPkt::OutgoingRTPPkt (const uint32 *const csrcs, uint16 numcsrc, const unsigned char *const data, size_t datalen, uint8 paddinglen = 0, CryptoContext * pcc = NULL)

Construct a new packet to be sent, containing several contributing source identifiers and payload.

A new copy in


memory (holding all this components along with the fixed header) is created. If the pointer to the SRTP CryptoContext is not NULL and holds a CryptoContext for the SSRC take the SSRC data into account when computing the required memory buffer.

Parameters

csrcs array of countributing source 32-bit identifiers, in host order.
numcsrc number of CSRC identifiers in the array.
data payload.
datalen payload length, in octets.
paddinglen pad packet to a multiple of paddinglen.
pcc Pointer to the SRTP CryptoContext, defaults to NULL if not specified.

OutgoingRTPPkt::OutgoingRTPPkt (const unsigned char *const data, size_t datalen, uint8 paddinglen = 0, CryptoContext * pcc = NULL)

Construct a new packet (fast variant, with no contributing sources and no header extension) to be sent.

A new copy in
memory (holding the whole packet) is created. If the pointer
to the SRTP CryptoContext is not NULL and holds a CryptoContext
for the SSRC take the SSRC data into account when computing
the required memory buffer.

Parameters

data payload.
datalen payload length, in octets.
paddinglen pad packet to a multiple of paddinglen.
pcc Pointer to the SRTP CryptoContext, defaults to NULL if not specified.

OutgoingRTPPkt::~OutgoingRTPPkt () [inline]

Member Function Documentation

bool OutgoingRTPPkt::operator!= (const OutgoingRTPPkt & p) const [inline]

Outgoing packets are not equal if their sequence numbers differ.

bool OutgoingRTPPkt::operator== (const OutgoingRTPPkt & p) const [inline]

Outgoing packets are equal if their sequence numbers match.

void OutgoingRTPPkt::protect (uint32 ssrc, CryptoContext * pcc)

Called packet is setup. This private method computes the SRTP data and stores it in the packet. Then encrypt the payload data (ex padding).

void OutgoingRTPPkt::setMarker (bool mark) [inline]

Specify the value of the marker bit. By default, the marker bit of outgoing packets is false/0. This method allows one to explicity specify and change that value.

Parameters

mark value for the market bit.

void OutgoingRTPPkt::setPayloadType (PayloadType pt) [inline]

Parameters

pt Packet payload type.

void OutgoingRTPPkt::setSeqNum (uint16 seq) [inline]

Sets the sequence number in the header.

Parameters

seq Packet sequence number, in host order.

void OutgoingRTPPkt::setSSRC (uint32 ssrc) const [inline]

Set synchronization source numeric identifier.

Parameters

ssrc 32-bit Synchronization SouRCe numeric identifier, in host order.

void OutgoingRTPPkt::setSSRCNetwork (uint32 ssrc) const [inline]

Set synchronization source numeric identifier. Special version to save endianness conversion.

Parameters

ssrc 32-bit Synchronization SouRCe numeric identifier, in network order.

void OutgoingRTPPkt::setTimestamp (uint32 pts) [inline]

Parameters

pts Packet timestamp, in host order.

Author

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