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259 lines
7.9 KiB
C++
259 lines
7.9 KiB
C++
/*
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This file is a part of JRTPLIB
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Copyright (c) 1999-2017 Jori Liesenborgs
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Contact: jori.liesenborgs@gmail.com
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This library was developed at the Expertise Centre for Digital Media
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(http://www.edm.uhasselt.be), a research center of the Hasselt University
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(http://www.uhasselt.be). The library is based upon work done for
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my thesis at the School for Knowledge Technology (Belgium/The Netherlands).
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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IN THE SOFTWARE.
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*/
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/**
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* \file rtppacket.h
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*/
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#ifndef RTPPACKET_H
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#define RTPPACKET_H
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#include "rtpconfig.h"
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#include "rtptypes.h"
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#include "rtptimeutilities.h"
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#include "rtpendian.h"
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namespace qrtplib
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{
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class RTPRawPacket;
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/** Represents an RTP Packet.
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* The RTPPacket class can be used to parse a RTPRawPacket instance if it represents RTP data.
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* The class can also be used to create a new RTP packet according to the parameters specified by
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* the user.
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*/
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class RTPPacket
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{
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public:
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/** Creates an RTPPacket instance based upon the data in \c rawpack, optionally installing a memory manager.
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* Creates an RTPPacket instance based upon the data in \c rawpack, optionally installing a memory manager.
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* If successful, the data is moved from the raw packet to the RTPPacket instance.
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*/
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RTPPacket(RTPRawPacket &rawpack);
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/** Creates a new buffer for an RTP packet and fills in the fields according to the specified parameters.
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* Creates a new buffer for an RTP packet and fills in the fields according to the specified parameters.
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* If \c maxpacksize is not equal to zero, an error is generated if the total packet size would exceed
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* \c maxpacksize. The arguments of the constructor are self-explanatory. Note that the size of a header
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* extension is specified in a number of 32-bit words. A memory manager can be installed.
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*/
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RTPPacket(uint8_t payloadtype,
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const void *payloaddata,
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unsigned int payloadlen,
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uint16_t seqnr,
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uint32_t timestamp,
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uint32_t ssrc,
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bool gotmarker,
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uint8_t numcsrcs,
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const uint32_t *csrcs,
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bool gotextension,
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uint16_t extensionid,
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uint16_t extensionlen_numwords,
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const void *extensiondata,
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unsigned int maxpacksize);
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/** This constructor is similar to the other constructor, but here data is stored in an external buffer
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* \c buffer with size \c buffersize. */
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RTPPacket(uint8_t payloadtype,
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const void *payloaddata,
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unsigned int payloadlen,
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uint16_t seqnr,
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uint32_t timestamp,
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uint32_t ssrc,
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bool gotmarker,
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uint8_t numcsrcs,
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const uint32_t *csrcs,
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bool gotextension,
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uint16_t extensionid,
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uint16_t extensionlen_numwords,
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const void *extensiondata,
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void *buffer,
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unsigned int buffersize);
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virtual ~RTPPacket()
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{
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if (packet && !externalbuffer)
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delete[] packet;
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}
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/** If an error occurred in one of the constructors, this function returns the error code. */
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int GetCreationError() const
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{
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return error;
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}
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/** Returns \c true if the RTP packet has a header extension and \c false otherwise. */
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bool HasExtension() const
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{
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return hasextension;
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}
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/** Returns \c true if the marker bit was set and \c false otherwise. */
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bool HasMarker() const
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{
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return hasmarker;
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}
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/** Returns the number of CSRCs contained in this packet. */
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int GetCSRCCount() const
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{
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return numcsrcs;
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}
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/** Returns a specific CSRC identifier.
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* Returns a specific CSRC identifier. The parameter \c num can go from 0 to GetCSRCCount()-1.
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*/
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uint32_t GetCSRC(int num) const;
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/** Returns the payload type of the packet. */
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uint8_t GetPayloadType() const
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{
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return payloadtype;
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}
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/** Returns the extended sequence number of the packet.
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* Returns the extended sequence number of the packet. When the packet is just received,
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* only the low $16$ bits will be set. The high 16 bits can be filled in later.
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*/
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uint32_t GetExtendedSequenceNumber() const
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{
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return extseqnr;
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}
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/** Returns the sequence number of this packet. */
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uint16_t GetSequenceNumber() const
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{
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return (uint16_t) (extseqnr & 0x0000FFFF);
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}
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/** Sets the extended sequence number of this packet to \c seq. */
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void SetExtendedSequenceNumber(uint32_t seq)
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{
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extseqnr = seq;
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}
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/** Returns the timestamp of this packet. */
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uint32_t GetTimestamp() const
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{
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return timestamp;
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}
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/** Returns the SSRC identifier stored in this packet. */
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uint32_t GetSSRC() const
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{
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return ssrc;
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}
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/** Returns a pointer to the data of the entire packet. */
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uint8_t *GetPacketData() const
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{
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return packet;
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}
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/** Returns a pointer to the actual payload data. */
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uint8_t *GetPayloadData() const
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{
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return payload;
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}
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/** Returns the length of the entire packet. */
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unsigned int GetPacketLength() const
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{
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return packetlength;
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}
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/** Returns the payload length. */
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unsigned int GetPayloadLength() const
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{
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return payloadlength;
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}
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/** If a header extension is present, this function returns the extension identifier. */
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uint16_t GetExtensionID() const
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{
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return extid;
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}
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/** Returns the length of the header extension data. */
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uint8_t *GetExtensionData() const
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{
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return extension;
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}
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/** Returns the length of the header extension data. */
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unsigned int GetExtensionLength() const
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{
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return extensionlength;
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}
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/** Returns the time at which this packet was received.
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* When an RTPPacket instance is created from an RTPRawPacket instance, the raw packet's
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* reception time is stored in the RTPPacket instance. This function then retrieves that
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* time.
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*/
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RTPTime GetReceiveTime() const
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{
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return receivetime;
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}
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private:
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void Clear();
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int ParseRawPacket(RTPRawPacket &rawpack);
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int BuildPacket(uint8_t payloadtype, const void *payloaddata, unsigned int payloadlen, uint16_t seqnr, uint32_t timestamp, uint32_t ssrc, bool gotmarker, uint8_t numcsrcs,
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const uint32_t *csrcs, bool gotextension, uint16_t extensionid, uint16_t extensionlen_numwords, const void *extensiondata, void *buffer, unsigned int maxsize);
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RTPEndian m_endian;
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int error;
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bool hasextension, hasmarker;
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int numcsrcs;
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uint8_t payloadtype;
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uint32_t extseqnr, timestamp, ssrc;
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uint8_t *packet, *payload;
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unsigned int packetlength, payloadlength;
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uint16_t extid;
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uint8_t *extension;
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unsigned int extensionlength;
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bool externalbuffer;
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RTPTime receivetime;
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};
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} // end namespace
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#endif // RTPPACKET_H
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