sdrangel/qrtplib/rtcppacketbuilder.h

/*

 This file is a part of JRTPLIB
 Copyright (c) 1999-2017 Jori Liesenborgs

 Contact: jori.liesenborgs@gmail.com

 This library was developed at the Expertise Centre for Digital Media
 (http://www.edm.uhasselt.be), a research center of the Hasselt University
 (http://www.uhasselt.be). The library is based upon work done for
 my thesis at the School for Knowledge Technology (Belgium/The Netherlands).

 Permission is hereby granted, free of charge, to any person obtaining a
 copy of this software and associated documentation files (the "Software"),
 to deal in the Software without restriction, including without limitation
 the rights to use, copy, modify, merge, publish, distribute, sublicense,
 and/or sell copies of the Software, and to permit persons to whom the
 Software is furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included
 in all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 IN THE SOFTWARE.

 */

/**
 * \file rtcppacketbuilder.h
 */

#ifndef RTCPPACKETBUILDER_H

#define RTCPPACKETBUILDER_H

#include "rtptypes.h"
#include "rtperrors.h"
#include "rtcpsdesinfo.h"
#include "rtptimeutilities.h"

#include "export.h"

namespace qrtplib
{

class RTPSources;
class RTPPacketBuilder;
class RTCPScheduler;
class RTCPCompoundPacket;
class RTCPCompoundPacketBuilder;

/** This class can be used to build RTCP compound packets, on a higher level than the RTCPCompoundPacketBuilder.
 *  The class RTCPPacketBuilder can be used to build RTCP compound packets. This class is more high-level
 *  than the RTCPCompoundPacketBuilder class: it uses the information of an RTPPacketBuilder instance and of
 *  an RTPSources instance to automatically generate the next compound packet which should be sent. It also
 *  provides functions to determine when SDES items other than the CNAME item should be sent.
 */
class QRTPLIB_API RTCPPacketBuilder
{
public:
    /** Creates an RTCPPacketBuilder instance.
     *  Creates an instance which will use the source table \c sources and the RTP packet builder
     *  \c rtppackbuilder to determine the information for the next RTCP compound packet. Optionally,
     *  the memory manager \c mgr can be installed.
     */
    RTCPPacketBuilder(RTPSources &sources, RTPPacketBuilder &rtppackbuilder);
    ~RTCPPacketBuilder();

    /** Initializes the builder.
     *  Initializes the builder to use the maximum allowed packet size \c maxpacksize, timestamp unit
     *  \c timestampunit and the SDES CNAME item specified by \c cname with length \c cnamelen.
     *  The timestamp unit is defined as a time interval divided by the timestamp interval corresponding to
     *  that interval: for 8000 Hz audio this would be 1/8000.
     */
    int Init(std::size_t maxpacksize, double timestampunit, const void *cname, std::size_t cnamelen);

    /** Cleans up the builder. */
    void Destroy();

    /** Sets the timestamp unit to be used to \c tsunit.
     *  Sets the timestamp unit to be used to \c tsunit. The timestamp unit is defined as a time interval
     *  divided by the timestamp interval corresponding to that interval: for 8000 Hz audio this would
     *  be 1/8000.
     */
    int SetTimestampUnit(double tsunit)
    {
        if (!init)
            return ERR_RTP_RTCPPACKETBUILDER_NOTINIT;
        if (tsunit < 0)
            return ERR_RTP_RTCPPACKETBUILDER_ILLEGALTIMESTAMPUNIT;
        timestampunit = tsunit;
        return 0;
    }

    /** Sets the maximum size allowed size of an RTCP compound packet to \c maxpacksize. */
    int SetMaximumPacketSize(std::size_t maxpacksize)
    {
        if (!init)
            return ERR_RTP_RTCPPACKETBUILDER_NOTINIT;
        if (maxpacksize < RTP_MINPACKETSIZE)
            return ERR_RTP_RTCPPACKETBUILDER_ILLEGALMAXPACKSIZE;
        maxpacketsize = maxpacksize;
        return 0;
    }

    /** This function allows you to inform RTCP packet builder about the delay between sampling the first
     *  sample of a packet and sending the packet.
     *  This function allows you to inform RTCP packet builder about the delay between sampling the first
     *  sample of a packet and sending the packet. This delay is taken into account when calculating the
     *  relation between RTP timestamp and wallclock time, used for inter-media synchronization.
     */
    int SetPreTransmissionDelay(const RTPTime &delay)
    {
        if (!init)
            return ERR_RTP_RTCPPACKETBUILDER_NOTINIT;
        transmissiondelay = delay;
        return 0;
    }

    /** Builds the next RTCP compound packet which should be sent and stores it in \c pack. */
    int BuildNextPacket(RTCPCompoundPacket **pack);

    /** Builds a BYE packet with reason for leaving specified by \c reason and length \c reasonlength.
     *  Builds a BYE packet with reason for leaving specified by \c reason and length \c reasonlength. If
     *  \c useSRifpossible is set to \c true, the RTCP compound packet will start with a sender report if
     *  allowed. Otherwise, a receiver report is used.
     */
    int BuildBYEPacket(RTCPCompoundPacket **pack, const void *reason, std::size_t reasonlength, bool useSRifpossible = true);

    /** Sets the RTCP interval for the SDES name item.
     *  After all possible sources in the source table have been processed, the class will check if other
     *  SDES items need to be sent. If \c count is zero or negative, nothing will happen. If \c count
     *  is positive, an SDES name item will be added after the sources in the source table have been
     *  processed \c count times.
     */
    void SetNameInterval(int count)
    {
        if (!init)
            return;
        interval_name = count;
    }

    /** Sets the RTCP interval for the SDES e-mail item.
     *  After all possible sources in the source table have been processed, the class will check if other
     *  SDES items need to be sent. If \c count is zero or negative, nothing will happen. If \c count
     *  is positive, an SDES e-mail item will be added after the sources in the source table have been
     *  processed \c count times.
     */
    void SetEMailInterval(int count)
    {
        if (!init)
            return;
        interval_email = count;
    }

    /** Sets the RTCP interval for the SDES location item.
     *  After all possible sources in the source table have been processed, the class will check if other
     *  SDES items need to be sent. If \c count is zero or negative, nothing will happen. If \c count
     *  is positive, an SDES location item will be added after the sources in the source table have been
     *  processed \c count times.
     */
    void SetLocationInterval(int count)
    {
        if (!init)
            return;
        interval_location = count;
    }

    /** Sets the RTCP interval for the SDES phone item.
     *  After all possible sources in the source table have been processed, the class will check if other
     *  SDES items need to be sent. If \c count is zero or negative, nothing will happen. If \c count
     *  is positive, an SDES phone item will be added after the sources in the source table have been
     *  processed \c count times.
     */
    void SetPhoneInterval(int count)
    {
        if (!init)
            return;
        interval_phone = count;
    }

    /** Sets the RTCP interval for the SDES tool item.
     *  After all possible sources in the source table have been processed, the class will check if other
     *  SDES items need to be sent. If \c count is zero or negative, nothing will happen. If \c count
     *  is positive, an SDES tool item will be added after the sources in the source table have been
     *  processed \c count times.
     */
    void SetToolInterval(int count)
    {
        if (!init)
            return;
        interval_tool = count;
    }

    /** Sets the RTCP interval for the SDES note item.
     *  After all possible sources in the source table have been processed, the class will check if other
     *  SDES items need to be sent. If \c count is zero or negative, nothing will happen. If \c count
     *  is positive, an SDES note item will be added after the sources in the source table have been
     *  processed \c count times.
     */
    void SetNoteInterval(int count)
    {
        if (!init)
            return;
        interval_note = count;
    }

    /** Sets the SDES name item for the local participant to the value \c s with length \c len. */
    int SetLocalName(const void *s, std::size_t len)
    {
        if (!init)
            return ERR_RTP_RTCPPACKETBUILDER_NOTINIT;
        return ownsdesinfo.SetName((const uint8_t *) s, len);
    }

    /** Sets the SDES e-mail item for the local participant to the value \c s with length \c len. */
    int SetLocalEMail(const void *s, std::size_t len)
    {
        if (!init)
            return ERR_RTP_RTCPPACKETBUILDER_NOTINIT;
        return ownsdesinfo.SetEMail((const uint8_t *) s, len);
    }

    /** Sets the SDES location item for the local participant to the value \c s with length \c len. */
    int SetLocalLocation(const void *s, std::size_t len)
    {
        if (!init)
            return ERR_RTP_RTCPPACKETBUILDER_NOTINIT;
        return ownsdesinfo.SetLocation((const uint8_t *) s, len);
    }

    /** Sets the SDES phone item for the local participant to the value \c s with length \c len. */
    int SetLocalPhone(const void *s, std::size_t len)
    {
        if (!init)
            return ERR_RTP_RTCPPACKETBUILDER_NOTINIT;
        return ownsdesinfo.SetPhone((const uint8_t *) s, len);
    }

    /** Sets the SDES tool item for the local participant to the value \c s with length \c len. */
    int SetLocalTool(const void *s, std::size_t len)
    {
        if (!init)
            return ERR_RTP_RTCPPACKETBUILDER_NOTINIT;
        return ownsdesinfo.SetTool((const uint8_t *) s, len);
    }

    /** Sets the SDES note item for the local participant to the value \c s with length \c len. */
    int SetLocalNote(const void *s, std::size_t len)
    {
        if (!init)
            return ERR_RTP_RTCPPACKETBUILDER_NOTINIT;
        return ownsdesinfo.SetNote((const uint8_t *) s, len);
    }

    /** Returns the own CNAME item with length \c len */
    uint8_t *GetLocalCNAME(std::size_t *len) const
    {
        if (!init)
            return 0;
        return ownsdesinfo.GetCNAME(len);
    }
private:
    void ClearAllSourceFlags();
    int FillInReportBlocks(RTCPCompoundPacketBuilder *pack, const RTPTime &curtime, int maxcount, bool *full, int *added, int *skipped, bool *atendoflist);
    int FillInSDES(RTCPCompoundPacketBuilder *pack, bool *full, bool *processedall, int *added);
    void ClearAllSDESFlags();

    RTPSources &sources;
    RTPPacketBuilder &rtppacketbuilder;

    bool init;
    std::size_t maxpacketsize;
    double timestampunit;
    bool firstpacket;
    RTPTime prevbuildtime, transmissiondelay;

    class RTCPSDESInfoInternal: public RTCPSDESInfo
    {
    public:
        RTCPSDESInfoInternal()
        {
            ClearFlags();
        }
        void ClearFlags()
        {
            pname = false;
            pemail = false;
            plocation = false;
            pphone = false;
            ptool = false;
            pnote = false;
        }
        bool ProcessedName() const
        {
            return pname;
        }
        bool ProcessedEMail() const
        {
            return pemail;
        }
        bool ProcessedLocation() const
        {
            return plocation;
        }
        bool ProcessedPhone() const
        {
            return pphone;
        }
        bool ProcessedTool() const
        {
            return ptool;
        }
        bool ProcessedNote() const
        {
            return pnote;
        }
        void SetProcessedName(bool v)
        {
            pname = v;
        }
        void SetProcessedEMail(bool v)
        {
            pemail = v;
        }
        void SetProcessedLocation(bool v)
        {
            plocation = v;
        }
        void SetProcessedPhone(bool v)
        {
            pphone = v;
        }
        void SetProcessedTool(bool v)
        {
            ptool = v;
        }
        void SetProcessedNote(bool v)
        {
            pnote = v;
        }
    private:
        bool pname, pemail, plocation, pphone, ptool, pnote;
    };

    RTCPSDESInfoInternal ownsdesinfo;
    int interval_name, interval_email, interval_location;
    int interval_phone, interval_tool, interval_note;
    bool doname, doemail, doloc, dophone, dotool, donote;
    bool processingsdes;

    int sdesbuildcount;
};

} // end namespace

#endif // RTCPPACKETBUILDER_H