1 files changed, 115 insertions, 0 deletions
diff --git a/src/base/QXmppRtpPacket.cpp b/src/base/QXmppRtpPacket.cpp
new file mode 100644
index 00000000..37d4eb7b
--- /dev/null
+++ b/src/base/QXmppRtpPacket.cpp
@@ -0,0 +1,115 @@
+/*
+ * Copyright (C) 2008-2014 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 "QXmppRtpPacket.h"
+
+#define RTP_VERSION 2
+
+QXmppRtpPacket::QXmppRtpPacket()
+    : marker(false)
+    , type(0)
+    , ssrc(0)
+    , sequence(0)
+    , stamp(0)
+{
+}
+
+QXmppRtpPacket::~QXmppRtpPacket()
+{
+}
+
+/// 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 >> 1) & 0xf;
+    const int hlen = 12 + 4 * cc;
+    if ((tmp >> 6) != RTP_VERSION || ba.size() < hlen)
+        return false;
+    stream >> tmp;
+    marker = (tmp >> 7);
+    type = tmp & 0x7f;
+    stream >> sequence;
+    stream >> stamp;
+    stream >> ssrc;
+
+    // contributing source IDs
+    csrc.clear();
+    quint32 src;
+    for (int i = 0; i < cc; ++i) {
+        stream >> src;
+        csrc << src;
+    }
+
+    // retrieve payload
+    payload = ba.right(ba.size() - hlen);
+    return true;
+}
+
+/// Encodes an RTP packet.
+
+QByteArray QXmppRtpPacket::encode() const
+{
+    Q_ASSERT(csrc.size() < 16);
+
+    // fixed header
+    QByteArray ba;
+    ba.resize(payload.size() + 12 + 4 * csrc.size());
+    QDataStream stream(&ba, QIODevice::WriteOnly);
+    stream << quint8((RTP_VERSION << 6) |
+                     ((csrc.size() & 0xf) << 1));
+    stream << quint8((type & 0x7f) | (marker << 7));
+    stream << sequence;
+    stream << stamp;
+    stream << ssrc;
+
+    // contributing source ids
+    foreach (const quint32 &src, csrc)
+        stream << src;
+
+    stream.writeRawData(payload.constData(), payload.size());
+    return ba;
+}
+
+/// 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(sequence),
+        QString::number(stamp),
+        QString::number(marker),
+        QString::number(type),
+        QString::number(payload.size()));
+}