voice chat via network

[Con Nít]

I want to write an online voice chat program used QTcpSocket
I refer to examples of code input / output audio in the QT example, but I had trouble reading the code, I do not understand in the QT example, which part is input / output ....
similar to the code below I have found it is written win32API :

#include <windows.h>
#include <mmsystem.h>
#include <iostream>
#include <stdio.h>
 
using namespace std;
 
#pragma comment(lib, "winmm.lib")
 
int main()
{
    const int NUMPTS = 441000;
    int sampleRate = 44100;
    short int waveIn[NUMPTS];
    HWAVEIN hWaveIn;
    WAVEHDR WaveInHdr;
    MMRESULT result;
    HWAVEOUT hWaveOut;
    WAVEFORMATEX pFormat;
    pFormat.wFormatTag = WAVE_FORMAT_PCM;
    pFormat.nChannels = 1;
    pFormat.nSamplesPerSec = sampleRate;
    pFormat.nAvgBytesPerSec = 2 * sampleRate;
    pFormat.nBlockAlign = 2;
    pFormat.wBitsPerSample = 16;
    pFormat.cbSize = 0;
    result = waveInOpen(&hWaveIn, WAVE_MAPPER, &pFormat, 0, 0, WAVE_FORMAT_DIRECT);
    if(result)
    {
        char fault[256];
        waveInGetErrorTextA(result, fault, 256);
        MessageBoxA(NULL, fault, "open error.", MB_OK | MB_ICONEXCLAMATION);
        return 1;
    }
    WaveInHdr.lpData = (LPSTR)waveIn;
    WaveInHdr.dwBufferLength = 2 * NUMPTS;
    WaveInHdr.dwBytesRecorded = 0;
    WaveInHdr.dwUser = 0;
    WaveInHdr.dwFlags = 0;
    WaveInHdr.dwLoops = 0;
    waveInPrepareHeader(hWaveIn, &WaveInHdr, sizeof(WAVEHDR));
    result = waveInAddBuffer(hWaveIn, &WaveInHdr, sizeof(WAVEHDR));
    if(result)
    {
        MessageBoxA(NULL, "add error", NULL, MB_OK | MB_ICONEXCLAMATION);
        return 1;
    }
    result = waveInStart(hWaveIn);
    if(result)
    {
        MessageBoxA(NULL, "start error", NULL, MB_OK | MB_ICONEXCLAMATION);
        return 1;
    }
    cout << "Recording..." << endl;
    Sleep((NUMPTS/sampleRate) * 1000);
    cout << "Playing..." << endl;
    if(waveOutOpen(&hWaveOut, WAVE_MAPPER, &pFormat, 0, 0, WAVE_FORMAT_DIRECT))
    {
        MessageBoxA(NULL, "outopen error", NULL, MB_OK | MB_ICONEXCLAMATION );
    }
    waveOutWrite(hWaveOut, &WaveInHdr, sizeof(WaveInHdr));
    Sleep((NUMPTS/sampleRate) * 1000); 
    waveOutUnprepareHeader(hWaveOut, &WaveInHdr, sizeof(WAVEHDR));
    waveInUnprepareHeader(hWaveIn, &WaveInHdr, sizeof(WAVEHDR));
    waveInClose(hWaveIn);
    waveOutClose(hWaveOut);
    return 0;
}

#include <windows.h>
#include <mmsystem.h>
#include <iostream>
#include <stdio.h>

using namespace std;

#pragma comment(lib, "winmm.lib")

int main()
{
    const int NUMPTS = 441000;
    int sampleRate = 44100;
    short int waveIn[NUMPTS];
    HWAVEIN hWaveIn;
    WAVEHDR WaveInHdr;
    MMRESULT result;
    HWAVEOUT hWaveOut;
    WAVEFORMATEX pFormat;
    pFormat.wFormatTag = WAVE_FORMAT_PCM;
    pFormat.nChannels = 1;
    pFormat.nSamplesPerSec = sampleRate;
    pFormat.nAvgBytesPerSec = 2 * sampleRate;
    pFormat.nBlockAlign = 2;
    pFormat.wBitsPerSample = 16;
    pFormat.cbSize = 0;
    result = waveInOpen(&hWaveIn, WAVE_MAPPER, &pFormat, 0, 0, WAVE_FORMAT_DIRECT);
    if(result)
    {
        char fault[256];
        waveInGetErrorTextA(result, fault, 256);
        MessageBoxA(NULL, fault, "open error.", MB_OK | MB_ICONEXCLAMATION);
        return 1;
    }
    WaveInHdr.lpData = (LPSTR)waveIn;
    WaveInHdr.dwBufferLength = 2 * NUMPTS;
    WaveInHdr.dwBytesRecorded = 0;
    WaveInHdr.dwUser = 0;
    WaveInHdr.dwFlags = 0;
    WaveInHdr.dwLoops = 0;
    waveInPrepareHeader(hWaveIn, &WaveInHdr, sizeof(WAVEHDR));
    result = waveInAddBuffer(hWaveIn, &WaveInHdr, sizeof(WAVEHDR));
    if(result)
    {
        MessageBoxA(NULL, "add error", NULL, MB_OK | MB_ICONEXCLAMATION);
        return 1;
    }
    result = waveInStart(hWaveIn);
    if(result)
    {
        MessageBoxA(NULL, "start error", NULL, MB_OK | MB_ICONEXCLAMATION);
        return 1;
    }
    cout << "Recording..." << endl;
    Sleep((NUMPTS/sampleRate) * 1000);
    cout << "Playing..." << endl;
    if(waveOutOpen(&hWaveOut, WAVE_MAPPER, &pFormat, 0, 0, WAVE_FORMAT_DIRECT))
    {
        MessageBoxA(NULL, "outopen error", NULL, MB_OK | MB_ICONEXCLAMATION );
    }
    waveOutWrite(hWaveOut, &WaveInHdr, sizeof(WaveInHdr));
    Sleep((NUMPTS/sampleRate) * 1000); 
    waveOutUnprepareHeader(hWaveOut, &WaveInHdr, sizeof(WAVEHDR));
    waveInUnprepareHeader(hWaveIn, &WaveInHdr, sizeof(WAVEHDR));
    waveInClose(hWaveIn);
    waveOutClose(hWaveOut);
    return 0;
}

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I need a similar code is written with QT. or can anyone give me demo code simple voice chat with QT.

[tbscope]

Wouldn't it be better to use UDP for voice?

[Con Nít]

i need a simple example input>send/receive>output audio easy to read and analyze code.can you help me?

[squidge]

There are separate examples in Qt for input and for output, so you should easily be able to analyse.