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/*
* Copyright (C) 2008-2019 The QXmpp developers
*
* Author:
* Jeremy Lainé
*
* Source:
* https://github.com/qxmpp-project/qxmpp
*
* This file is a part of QXmpp library.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
*/
#include <QDataStream>
#include <QSharedData>
#include "QXmppRtpPacket.h"
#define RTP_VERSION 2
class QXmppRtpPacketPrivate : public QSharedData
{
public:
QXmppRtpPacketPrivate();
/// Marker flag.
bool marker;
/// Payload type.
quint8 type;
/// Synchronization source.
quint32 ssrc;
/// Contributing sources.
QList<quint32> csrc;
/// Sequence number.
quint16 sequence;
/// Timestamp.
quint32 stamp;
/// Raw payload data.
QByteArray payload;
};
QXmppRtpPacketPrivate::QXmppRtpPacketPrivate()
: marker(false)
, type(0)
, ssrc(0)
, sequence(0)
, stamp(0)
{
}
/// Constructs an empty RTP packet
QXmppRtpPacket::QXmppRtpPacket()
: d(new QXmppRtpPacketPrivate())
{
}
/// Constructs a copy of other.
///
/// \param other
///
QXmppRtpPacket::QXmppRtpPacket(const QXmppRtpPacket &other)
: d(other.d)
{
}
QXmppRtpPacket::~QXmppRtpPacket()
{
}
/// Assigns the other packet to this one.
///
/// \param other
///
QXmppRtpPacket& QXmppRtpPacket::operator=(const QXmppRtpPacket& other)
{
d = other.d;
return *this;
}
/// Parses an RTP packet.
///
/// \param ba
bool QXmppRtpPacket::decode(const QByteArray &ba)
{
if (ba.isEmpty())
return false;
// fixed header
quint8 tmp;
QDataStream stream(ba);
stream >> tmp;
const quint8 cc = (tmp & 0xf);
const int hlen = 12 + 4 * cc;
if ((tmp >> 6) != RTP_VERSION || ba.size() < hlen)
return false;
stream >> tmp;
d->marker = (tmp >> 7);
d->type = tmp & 0x7f;
stream >> d->sequence;
stream >> d->stamp;
stream >> d->ssrc;
// contributing source IDs
d->csrc.clear();
quint32 src;
for (int i = 0; i < cc; ++i) {
stream >> src;
d->csrc << src;
}
// retrieve payload
d->payload = ba.right(ba.size() - hlen);
return true;
}
/// Encodes an RTP packet.
QByteArray QXmppRtpPacket::encode() const
{
Q_ASSERT(d->csrc.size() < 16);
// fixed header
QByteArray ba;
ba.resize(d->payload.size() + 12 + 4 * d->csrc.size());
QDataStream stream(&ba, QIODevice::WriteOnly);
stream << quint8((RTP_VERSION << 6) |
(d->csrc.size() & 0xf));
stream << quint8((d->type & 0x7f) | (d->marker << 7));
stream << d->sequence;
stream << d->stamp;
stream << d->ssrc;
// contributing source ids
foreach (const quint32 &src, d->csrc)
stream << src;
stream.writeRawData(d->payload.constData(), d->payload.size());
return ba;
}
QList<quint32> QXmppRtpPacket::csrc() const
{
return d->csrc;
}
void QXmppRtpPacket::setCsrc(const QList<quint32> &csrc)
{
d->csrc = csrc;
}
bool QXmppRtpPacket::marker() const
{
return d->marker;
}
void QXmppRtpPacket::setMarker(bool marker)
{
d->marker = marker;
}
QByteArray QXmppRtpPacket::payload() const
{
return d->payload;
}
void QXmppRtpPacket::setPayload(const QByteArray &payload)
{
d->payload = payload;
}
quint32 QXmppRtpPacket::ssrc() const
{
return d->ssrc;
}
void QXmppRtpPacket::setSsrc(quint32 ssrc)
{
d->ssrc = ssrc;
}
quint16 QXmppRtpPacket::sequence() const
{
return d->sequence;
}
void QXmppRtpPacket::setSequence(quint16 sequence)
{
d->sequence = sequence;
}
quint32 QXmppRtpPacket::stamp() const
{
return d->stamp;
}
void QXmppRtpPacket::setStamp(quint32 stamp)
{
d->stamp = stamp;
}
quint8 QXmppRtpPacket::type() const
{
return d->type;
}
void QXmppRtpPacket::setType(quint8 type)
{
d->type = type;
}
/// Returns a string representation of the RTP header.
QString QXmppRtpPacket::toString() const
{
return QString("RTP packet seq %1 stamp %2 marker %3 type %4 size %5").arg(
QString::number(d->sequence),
QString::number(d->stamp),
QString::number(d->marker),
QString::number(d->type),
QString::number(d->payload.size()));
}
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