rtppacketbuilder.h

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/*

 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.

 */

#ifndef RTPPACKETBUILDER_H

#define RTPPACKETBUILDER_H

#include "rtpconfig.h"
#include "rtperrors.h"
#include "rtpdefines.h"
#include "rtprandom.h"
#include "rtptimeutilities.h"
#include "rtptypes.h"

#include "export.h"

namespace qrtplib
{

class RTPSources;

class QRTPLIB_API RTPPacketBuilder
{
public:
    RTPPacketBuilder(RTPRandom &rtprand);
    ~RTPPacketBuilder();

    int Init(unsigned int maxpacksize);

    void Destroy();

    uint32_t GetPacketCount()
    {
        if (!init)
            return 0;
        return numpackets;
    }

    uint32_t GetPayloadOctetCount()
    {
        if (!init)
            return 0;
        return numpayloadbytes;
    }

    int SetMaximumPacketSize(unsigned int maxpacksize);

    int AddCSRC(uint32_t csrc);

    int DeleteCSRC(uint32_t csrc);

    void ClearCSRCList();

    int BuildPacket(const void *data, unsigned int len);

    int BuildPacket(const void *data, unsigned int len, uint8_t pt, bool mark, uint32_t timestampinc);

    int BuildPacketEx(const void *data, unsigned int len, uint16_t hdrextID, const void *hdrextdata, unsigned int numhdrextwords);

    int BuildPacketEx(const void *data, unsigned int len, uint8_t pt, bool mark, uint32_t timestampinc, uint16_t hdrextID, const void *hdrextdata, unsigned int numhdrextwords);

    uint8_t *GetPacket()
    {
        if (!init)
            return 0;
        return buffer;
    }

    unsigned int GetPacketLength()
    {
        if (!init)
            return 0;
        return packetlength;
    }

    int SetDefaultPayloadType(uint8_t pt);

    int SetDefaultMark(bool m);

    int SetDefaultTimestampIncrement(uint32_t timestampinc);

    int IncrementTimestamp(uint32_t inc);

    int IncrementTimestampDefault();

    uint32_t CreateNewSSRC();

    uint32_t CreateNewSSRC(RTPSources &sources);

    uint32_t GetSSRC() const
    {
        if (!init)
            return 0;
        return ssrc;
    }

    uint32_t GetTimestamp() const
    {
        if (!init)
            return 0;
        return timestamp;
    }

    uint16_t GetSequenceNumber() const
    {
        if (!init)
            return 0;
        return seqnr;
    }

    RTPTime GetPacketTime() const
    {
        if (!init)
            return RTPTime(0, 0);
        return lastwallclocktime;
    }

    uint32_t GetPacketTimestamp() const
    {
        if (!init)
            return 0;
        return lastrtptimestamp;
    }

    void AdjustSSRC(uint32_t s)
    {
        ssrc = s;
    }
private:
    int PrivateBuildPacket(
            const void *data,
            unsigned int len, uint8_t pt,
            bool mark,
            uint32_t timestampinc,
            bool gotextension, uint16_t hdrextID = 0,
            const void *hdrextdata = 0,
            unsigned int numhdrextwords = 0);

    RTPRandom &rtprnd;
    unsigned int maxpacksize;
    uint8_t *buffer;
    unsigned int packetlength;

    uint32_t numpayloadbytes;
    uint32_t numpackets;
    bool init;

    uint32_t ssrc;
    uint32_t timestamp;
    uint16_t seqnr;

    uint32_t defaulttimestampinc;
    uint8_t defaultpayloadtype;
    bool defaultmark;

    bool deftsset, defptset, defmarkset;

    uint32_t csrcs[RTP_MAXCSRCS];
    int numcsrcs;

    RTPTime lastwallclocktime;
    uint32_t lastrtptimestamp;
    uint32_t prevrtptimestamp;
};

inline int RTPPacketBuilder::SetDefaultPayloadType(uint8_t pt)
{
    if (!init)
        return ERR_RTP_PACKBUILD_NOTINIT;
    defptset = true;
    defaultpayloadtype = pt;
    return 0;
}

inline int RTPPacketBuilder::SetDefaultMark(bool m)
{
    if (!init)
        return ERR_RTP_PACKBUILD_NOTINIT;
    defmarkset = true;
    defaultmark = m;
    return 0;
}

inline int RTPPacketBuilder::SetDefaultTimestampIncrement(uint32_t timestampinc)
{
    if (!init)
        return ERR_RTP_PACKBUILD_NOTINIT;
    deftsset = true;
    defaulttimestampinc = timestampinc;
    return 0;
}

inline int RTPPacketBuilder::IncrementTimestamp(uint32_t inc)
{
    if (!init)
        return ERR_RTP_PACKBUILD_NOTINIT;
    timestamp += inc;
    return 0;
}

inline int RTPPacketBuilder::IncrementTimestampDefault()
{
    if (!init)
        return ERR_RTP_PACKBUILD_NOTINIT;
    if (!deftsset)
        return ERR_RTP_PACKBUILD_DEFAULTTSINCNOTSET;
    timestamp += defaulttimestampinc;
    return 0;
}

} // end namespace

#endif // RTPPACKETBUILDER_H