Showcase 2 – QT Simple VoIP Program

This software is a DEMO, intended to demonstrates MY SKILLS in this subjects:

[table id=2 /]

Abstract

Showcase2 is a simple VoIP program completely developed using QT libraries, and C++, intended to be used inside your private network (does not implements any NAT traversal algorithm). Download this demo and prepare yourself with microphone and earphones.

Instructions

Windows:

1. download & install VS 2015 redist using this link (or search from google).
2. download software using this link
3. unpack contents in a empty folder
4. Double click and run simple_voip_program.exe
5. You must see first about dialog, just click OK and continue next screen.

Ubuntu 16.04:

1. download software using this link
2. unpack contentes in a empty folder
3. Double click and run deploy/simple_voip_linux_qt
4. You must see first about dialog, just click OK and continue next screen.

Then you see VoIP program screen:

Just follow steps in order is showed.

NOTE: maybe you guess, but this program needs a partner or peer program running in other pc machine, both connected to the same private network (same router for example).

NOTE: i suggest you download and run Wireshark software, in order to sniff UDP packets traveling through UDP ports 20000 (control channel) & 20001 (voice channel).

Code Snippet

qint64 AudioInput::readData(char *data, qint64 maxlen)
{
    qint64 total = 0;
    QByteArray datagram;
    QHostAddress src_addr;
    int s, count;

    count = 0;
    do
    {
        audioUdpSocket->waitForReadyRead(100);
        while(total < maxlen && audioUdpSocket->hasPendingDatagrams())
        {
            datagram.resize(audioUdpSocket->pendingDatagramSize());
            if(audioUdpSocket->readDatagram(datagram.data(), datagram.size(), &src_addr) <= 0) continue;
            QByteArray decompress = qUncompress(datagram);
            s = decompress.size() - sizeof(int);
            if(s + total > maxlen) s = maxlen - total;
            if(s <= 0) return total;
            memcpy(data + total, decompress.data() + sizeof(int), s);
            total += s;
        }
    } while(total == 0 && count++ < 5);
    return total;
}