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 :

Qt Code: 
  1. #include <windows.h>
  2. #include <mmsystem.h>
  3. #include <iostream>
  4. #include <stdio.h>
  5.  
  6. using namespace std;
  7.  
  8. #pragma comment(lib, "winmm.lib")
  9.  
  10. int main()
  11. {
  12.     const int NUMPTS = 441000;
  13.     int sampleRate = 44100;
  14.     short int waveIn[NUMPTS];
  15.     HWAVEIN hWaveIn;
  16.     WAVEHDR WaveInHdr;
  17.     MMRESULT result;
  18.     HWAVEOUT hWaveOut;
  19.     WAVEFORMATEX pFormat;
  20.     pFormat.wFormatTag = WAVE_FORMAT_PCM;
  21.     pFormat.nChannels = 1;
  22.     pFormat.nSamplesPerSec = sampleRate;
  23.     pFormat.nAvgBytesPerSec = 2 * sampleRate;
  24.     pFormat.nBlockAlign = 2;
  25.     pFormat.wBitsPerSample = 16;
  26.     pFormat.cbSize = 0;
  27.     result = waveInOpen(&hWaveIn, WAVE_MAPPER, &pFormat, 0, 0, WAVE_FORMAT_DIRECT);
  28.     if(result)
  29.     {
  30.         char fault[256];
  31.         waveInGetErrorTextA(result, fault, 256);
  32.         MessageBoxA(NULL, fault, "open error.", MB_OK | MB_ICONEXCLAMATION);
  33.         return 1;
  34.     }
  35.     WaveInHdr.lpData = (LPSTR)waveIn;
  36.     WaveInHdr.dwBufferLength = 2 * NUMPTS;
  37.     WaveInHdr.dwBytesRecorded = 0;
  38.     WaveInHdr.dwUser = 0;
  39.     WaveInHdr.dwFlags = 0;
  40.     WaveInHdr.dwLoops = 0;
  41.     waveInPrepareHeader(hWaveIn, &WaveInHdr, sizeof(WAVEHDR));
  42.     result = waveInAddBuffer(hWaveIn, &WaveInHdr, sizeof(WAVEHDR));
  43.     if(result)
  44.     {
  45.         MessageBoxA(NULL, "add error", NULL, MB_OK | MB_ICONEXCLAMATION);
  46.         return 1;
  47.     }
  48.     result = waveInStart(hWaveIn);
  49.     if(result)
  50.     {
  51.         MessageBoxA(NULL, "start error", NULL, MB_OK | MB_ICONEXCLAMATION);
  52.         return 1;
  53.     }
  54.     cout << "Recording..." << endl;
  55.     Sleep((NUMPTS/sampleRate) * 1000);
  56.     cout << "Playing..." << endl;
  57.     if(waveOutOpen(&hWaveOut, WAVE_MAPPER, &pFormat, 0, 0, WAVE_FORMAT_DIRECT))
  58.     {
  59.         MessageBoxA(NULL, "outopen error", NULL, MB_OK | MB_ICONEXCLAMATION );
  60.     }
  61.     waveOutWrite(hWaveOut, &WaveInHdr, sizeof(WaveInHdr));
  62.     Sleep((NUMPTS/sampleRate) * 1000); 
  63.     waveOutUnprepareHeader(hWaveOut, &WaveInHdr, sizeof(WAVEHDR));
  64.     waveInUnprepareHeader(hWaveIn, &WaveInHdr, sizeof(WAVEHDR));
  65.     waveInClose(hWaveIn);
  66.     waveOutClose(hWaveOut);
  67.     return 0;
  68. }
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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.