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225 lines
7.5 KiB
C++
225 lines
7.5 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 rtcpscheduler.h
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*/
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#ifndef RTCPSCHEDULER_H
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#define RTCPSCHEDULER_H
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#include "rtptimeutilities.h"
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#include "rtprandom.h"
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#include <cstddef>
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#include "export.h"
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namespace qrtplib
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{
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class RTCPCompoundPacket;
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class RTPPacket;
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class RTPSources;
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/** Describes parameters used by the RTCPScheduler class. */
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class QRTPLIB_API RTCPSchedulerParams
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{
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public:
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RTCPSchedulerParams();
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~RTCPSchedulerParams();
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/** Sets the RTCP bandwidth to be used to \c bw (in bytes per second). */
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int SetRTCPBandwidth(double bw);
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/** Returns the used RTCP bandwidth in bytes per second (default is 1000). */
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double GetRTCPBandwidth() const
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{
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return bandwidth;
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}
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/** Sets the fraction of the RTCP bandwidth reserved for senders to \c fraction. */
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int SetSenderBandwidthFraction(double fraction);
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/** Returns the fraction of the RTCP bandwidth reserved for senders (default is 25%). */
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double GetSenderBandwidthFraction() const
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{
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return senderfraction;
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}
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/** Sets the minimum (deterministic) interval between RTCP compound packets to \c t. */
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int SetMinimumTransmissionInterval(const RTPTime &t);
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/** Returns the minimum RTCP transmission interval (default is 5 seconds). */
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RTPTime GetMinimumTransmissionInterval() const
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{
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return mininterval;
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}
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/** If \c usehalf is \c true, only use half the minimum interval before sending the first RTCP compound packet. */
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void SetUseHalfAtStartup(bool usehalf)
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{
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usehalfatstartup = usehalf;
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}
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/** Returns \c true if only half the minimum interval should be used before sending the first RTCP compound packet
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* (defualt is \c true).
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*/
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bool GetUseHalfAtStartup() const
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{
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return usehalfatstartup;
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}
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/** If \c v is \c true, the scheduler will schedule a BYE packet to be sent immediately if allowed. */
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void SetRequestImmediateBYE(bool v)
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{
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immediatebye = v;
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}
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/** Returns if the scheduler will schedule a BYE packet to be sent immediately if allowed
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* (default is \c true).
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*/
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bool GetRequestImmediateBYE() const
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{
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return immediatebye;
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}
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private:
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double bandwidth;
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double senderfraction;
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RTPTime mininterval;
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bool usehalfatstartup;
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bool immediatebye;
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};
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/** This class determines when RTCP compound packets should be sent. */
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class RTCPScheduler
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{
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public:
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/** Creates an instance which will use the source table RTPSources to determine when RTCP compound
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* packets should be scheduled.
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* Creates an instance which will use the source table RTPSources to determine when RTCP compound
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* packets should be scheduled. Note that for correct operation the \c sources instance should have information
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* about the own SSRC (added by RTPSources::CreateOwnSSRC). You must also supply a random number
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* generator \c rtprand which will be used for adding randomness to the RTCP intervals.
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*/
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RTCPScheduler(RTPSources &sources, RTPRandom &rtprand);
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~RTCPScheduler();
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/** Resets the scheduler. */
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void Reset();
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/** Sets the scheduler parameters to be used to \c params. */
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void SetParameters(const RTCPSchedulerParams ¶ms)
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{
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schedparams = params;
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}
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/** Returns the currently used scheduler parameters. */
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RTCPSchedulerParams GetParameters() const
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{
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return schedparams;
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}
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/** Sets the header overhead from underlying protocols (for example UDP and IP) to \c numbytes. */
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void SetHeaderOverhead(std::size_t numbytes)
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{
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headeroverhead = numbytes;
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}
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/** Returns the currently used header overhead. */
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std::size_t GetHeaderOverhead() const
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{
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return headeroverhead;
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}
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/** For each incoming RTCP compound packet, this function has to be called for the scheduler to work correctly. */
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void AnalyseIncoming(RTCPCompoundPacket &rtcpcomppack);
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/** For each outgoing RTCP compound packet, this function has to be called for the scheduler to work correctly. */
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void AnalyseOutgoing(RTCPCompoundPacket &rtcpcomppack);
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/** This function has to be called each time a member times out or sends a BYE packet. */
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void ActiveMemberDecrease();
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/** Asks the scheduler to schedule an RTCP compound packet containing a BYE packetl; the compound packet
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* has size \c packetsize.
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*/
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void ScheduleBYEPacket(std::size_t packetsize);
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/** Returns the delay after which an RTCP compound will possibly have to be sent.
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* Returns the delay after which an RTCP compound will possibly have to be sent. The IsTime member function
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* should be called afterwards to make sure that it actually is time to send an RTCP compound packet.
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*/
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RTPTime GetTransmissionDelay();
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/** This function returns \c true if it's time to send an RTCP compound packet and \c false otherwise.
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* This function returns \c true if it's time to send an RTCP compound packet and \c false otherwise.
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* If the function returns \c true, it will also have calculated the next time at which a packet should
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* be sent, so if it is called again right away, it will return \c false.
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*/
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bool IsTime();
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/** Calculates the deterministic interval at this time.
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* Calculates the deterministic interval at this time. This is used - in combination with a certain multiplier -
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* to time out members, senders etc.
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*/
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RTPTime CalculateDeterministicInterval(bool sender = false);
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private:
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void CalculateNextRTCPTime();
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void PerformReverseReconsideration();
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RTPTime CalculateBYETransmissionInterval();
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RTPTime CalculateTransmissionInterval(bool sender);
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RTPSources &sources;
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RTCPSchedulerParams schedparams;
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std::size_t headeroverhead;
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std::size_t avgrtcppacksize;
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bool hassentrtcp;
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bool firstcall;
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RTPTime nextrtcptime;
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RTPTime prevrtcptime;
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int pmembers;
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// for BYE packet scheduling
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bool byescheduled;
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int byemembers, pbyemembers;
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std::size_t avgbyepacketsize;
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bool sendbyenow;
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RTPRandom &rtprand;
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};
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} // end namespace
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#endif // RTCPSCHEDULER_H
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