RTPPacket(3) | Library Functions Manual | RTPPacket(3) |
NAME¶
RTPPacket - A base class for both IncomingRTPPkt and OutgoingRTPPkt.SYNOPSIS¶
#include <rtppkt.h> Inherited by IncomingRTPPkt, and OutgoingRTPPkt.Classes¶
struct RFC2833Payload
Public Member Functions¶
RTPPacket (const unsigned char *const block, size_t len, bool duplicate=false)
Protected Member Functions¶
virtual ~RTPPacket ()
Protected Attributes¶
uint16 cachedSeqNum
Detailed Description¶
A base class for both IncomingRTPPkt and OutgoingRTPPkt. Provides common low level header structures and related methods. This class provides an interface that allows for partial and generic manipulation of RTP data packets. Values are returned in host order, except raw structures, which are returned as they are sent through the network. Author:David Sugar dyfet@ostel.com
Constructor & Destructor Documentation¶
RTPPacket::RTPPacket (const unsigned char *constblock, size_tlen, boolduplicate = false)¶
Constructor, construct a packet object given the memory zone its content (header and payload) is stored. Commonly used to build RTPPacket objects from incoming data. Parameters:block whole packet
len total length (header + payload + padding) of the packet
duplicate whether to memcopy the packet. At present, this feature is not
used.
Note:
used in IncomingRTPPkt.
RTPPacket::RTPPacket (size_thdrlen, size_tplen, uint8paddinglen, CryptoContext *pcc = NULL)¶
Construct a packet object without specifying its real content yet. Commonly used for outgoing packets. Header fields and payload must be filled in by another methods or by a derived constructor. Parameters:hdrlen length of the header (including CSRC and
extension).
plen payload length.
paddinglen pad packet to a multiple of paddinglen
Note:
used in OutgoingRTPPkt.
virtual RTPPacket::~RTPPacket () [inline], [protected], [virtual]¶
Destructor, free the buffer provided in the constructor.Member Function Documentation¶
void RTPPacket::endPacket () [protected]¶
Free memory allocated for the packet.uint16 RTPPacket::get2833Duration (void) [inline]¶
Fetch 2833 duration field. Returns:2833 duration in native host machine byte order.
const uint32* RTPPacket::getCSRCs () const [inline]¶
Get the 32-bit identifiers of the contributing sources for the packet as an array, of length getCSRCsCount(). Returns:An array of CSRC identifiers as they are in the packet
(in network order).
uint16 RTPPacket::getCSRCsCount () const [inline]¶
Get the number of contributing sources specified in the packet header.const unsigned char* RTPPacket::getHdrExtContent () const [inline]¶
Get the content of the header extension. Returns:NULL if the packet has no header extension, otherwise a
pointer to the packet header extension content.
uint32 RTPPacket::getHdrExtSize () const [inline]¶
Get the length (in octets) of the data contained in the header extension. Note that this length does not include the four octets at the beginning of the header extension. Returns:0 if the packet has no header extension, otherwise the
length.
Note:
0 is a valid value for this field, so
RTPPacket::isExtended() should be used.
uint16 RTPPacket::getHdrExtUndefined () const [inline]¶
Get the first 16 bits (in network order) of the header of the RTP header extension. Its meaning is undefined at this level. Returns:0 if the packet has no header extension, otherwise the
first 16 bits of the header extension, in network order.
Note:
0 could be a valid value for the first 16 bits, in that
case RTPPacket::isExtended() should be use.
RTPFixedHeader* RTPPacket::getHeader () const [inline], [protected]¶
Return low level structure for the header of the packet. Returns:RTPFixedHeader pointer to the header of the packet.
const RTPHeaderExt* RTPPacket::getHeaderExt () const [inline], [protected]¶
Get a pointer to RTPHeaderExt pointing after the RTP header (fixed part plus contributing sources). No check for for the X bit is done. Returns:header extension if present, garbage if not.
uint32 RTPPacket::getHeaderSize () const [inline]¶
Get the length of the header, including contributing sources identifiers and header extension, if present. Returns:number of octets.
uint8 RTPPacket::getPaddingSize () const [inline]¶
Get the number of octets padding the end of the payload section. Returns:Padding length in octets.
const uint8* const RTPPacket::getPayload () const [inline]¶
Returns:pointer to the payload section of the packet.
uint32 RTPPacket::getPayloadSize () const [inline]¶
Returns:length of the payload section, in octets.
PayloadType RTPPacket::getPayloadType () const [inline]¶
Returns:value of the PT header field.
uint8 RTPPacket::getProtocolVersion () const [inline]¶
Returns:RTP protocol version of packet.
struct RFC2833Payload* RTPPacket::getRaw2833Payload (void) [inline]¶
Fetch a raw 2833 packet. Returns:low level 2833 data structure.
const unsigned char* const RTPPacket::getRawPacket () const [inline]¶
Get the raw packet as it will be sent through the network. Returns:memory zone where the raw packet structure is stored
in.
uint32 RTPPacket::getRawPacketSize () const [inline]¶
Get the raw packet length, including header, extension, payload and padding. Returns:size of the raw packet structure.
uint32 RTPPacket::getRawPacketSizeSrtp () const [inline]¶
uint32 RTPPacket::getRawTimestamp () const [inline], [protected]¶
Obtain the absolute timestamp carried in the packet header. Returns:32-bit timestamp in host order.
uint16 RTPPacket::getSeqNum () const [inline]¶
Returns:value of the sequence number header field, in host
order.
size_t RTPPacket::getSizeOfFixedHeader () const [inline]¶
uint32 RTPPacket::getTimestamp () const [inline]¶
Returns:packet timestamp in host order.
bool RTPPacket::isExtended () const [inline]¶
Ask whether the packet contains header extensions. Returns:true if the header extension bit is 1.
bool RTPPacket::isMarked () const [inline]¶
Ask whether the packet is marked (for isntance, is a new talk spurt in some audio profiles). Returns:true is the header marker bit is 1.
bool RTPPacket::isPadded () const [inline]¶
Ask whether the packet contains padding bytes at the end. Returns:true if the header padding bit is 1.
void RTPPacket::reComputePayLength (boolpadding)¶
Re-compute payload length. This recomputation may be necessary in case of SRTP. We need to decrypt the packet before we can handle padding. See takeInDataPacket in incqueue.cpp Parameters:padding If true then set padding flag in RTP
header and re-compute payloadSize.
void RTPPacket::set2833Duration (uint16timestamp) [inline]¶
Set 2833 duration field. Parameters:timestamp to use, native host machine byte
order.
void RTPPacket::setbuffer (const void *src, size_tlen, size_tpos) [inline], [protected]¶
void RTPPacket::setExtension (boole) [inline], [protected]¶
Member Data Documentation¶
uint16 RTPPacket::cachedSeqNum [protected]¶
Packet sequence number in host order.uint32 RTPPacket::cachedTimestamp [protected]¶
Packet timestamp in host order (includes initial shift).uint32 RTPPacket::payloadSize [protected]¶
note: payload (not full packet) size.uint32 RTPPacket::srtpDataOffset [protected]¶
Offset into packet memory pointing to area for SRTP data. This offset points to the memory where the SRTP protect will store the authentication and MKI data.int32 RTPPacket::srtpLength [protected]¶
Lebgth of additional SRTP data. Covers the SRTP authentication and MKI data.uint32 RTPPacket::total [protected]¶
total length, including header, payload and paddingAuthor¶
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