C / C++ / MFC

// AudioTest.c : console application.<br />
<br />
#include "stdafx.h"<br />
#include <windows.h><br />
#include <vfw.h><br />
#include <mmsystem.h><br />
<br />
#define DEF_BlocksPerSecond 25<br />
#define DEF_NumAudioBlocks 1500<br />
// grabbing at 25Hz to match PAL video frames, 1500 frames = 60 seconds<br />
<br />
int main(int argc, char* argv[])<br />
{<br />
   unsigned int uiNumWaveInDevices;<br />
   unsigned int uiCounter;<br />
   unsigned int uiReturn;<br />
   char szTempString[100];<br />
   WAVEINCAPS WaveInCaps;<br />
   BOOL bSoundModeValid;<br />
   HWAVEIN hWaveInDevice;<br />
   WAVEFORMATEX WaveFormat;<br />
   unsigned int uiAudioBufferNumBytes;<br />
<br />
   WAVEHDR WaveHeaders[DEF_NumAudioBlocks];<br />
<br />
   // going to capture at 11.025Hz, Mono, 16 bps<br />
   uiAudioBufferNumBytes = 11025 * 2 / DEF_BlocksPerSecond;<br />
<br />
   uiNumWaveInDevices = waveInGetNumDevs();<br />
<br />
   for (uiCounter=0; uiCounter < uiNumWaveInDevices; uiCounter++)<br />
   {<br />
      // Check device can do mono, 11.025kHz, 16 bit/sample<br />
      waveInGetDevCaps(uiCounter, &WaveInCaps, sizeof(WaveInCaps));<br />
      bSoundModeValid = WaveInCaps.dwFormats & WAVE_FORMAT_1M16;<br />
      if (bSoundModeValid)<br />
         break; // Stop with first suitable device<br />
   }<br />
<br />
   if (!bSoundModeValid)<br />
      return(1); // First possible error exit<br />
<br />
   // Hard-code the wave format - mono, 16bit, 11.025kHz<br />
   WaveFormat.wFormatTag = WAVE_FORMAT_PCM;<br />
   WaveFormat.nChannels = 1; // Mono<br />
   WaveFormat.nSamplesPerSec = 11025; // 11.025 kHz<br />
   WaveFormat.nBlockAlign = 2; // 2 bytes per sample<br />
   WaveFormat.wBitsPerSample = 16; // 16 bits per sample<br />
   WaveFormat.nAvgBytesPerSec = 11025 * 2; // obvious<br />
   WaveFormat.cbSize = 0; // no additional data<br />
<br />
   hWaveInDevice = NULL;<br />
   <br />
   uiReturn = waveInOpen(&hWaveInDevice,uiCounter-1,&WaveFormat,0,0,CALLBACK_NULL);<br />
   if (uiReturn != MMSYSERR_NOERROR)<br />
   {<br />
      MessageBox(0, "Error opening wave in device", "WaveInOpen Error",<br />
            MB_OK);<br />
      return (2); // Second possible error exit<br />
   }<br />
<br />
   // Create the buffers<br />
   for(uiCounter = 0; uiCounter<DEF_NumAudioBlocks; uiCounter++)<br />
   {<br />
      // Allocate storage space for wave data<br />
      WaveHeaders[uiCounter].lpData = <br />
            GlobalLock(GlobalAlloc(GMEM_FIXED, uiAudioBufferNumBytes));<br />
      if (WaveHeaders[uiCounter].lpData == NULL)<br />
      {<br />
         MessageBox(0, "Error allocating wave data", "Wave Data Error",<br />
               MB_OK);<br />
         return (3); // 3rd error - rely on Windows to un-allocate on exit<br />
      }<br />
<br />
      WaveHeaders[uiCounter].dwBufferLength = uiAudioBufferNumBytes;<br />
      WaveHeaders[uiCounter].dwBytesRecorded = 0;<br />
      WaveHeaders[uiCounter].dwUser = 0;<br />
      WaveHeaders[uiCounter].dwFlags = 0;<br />
      WaveHeaders[uiCounter].dwLoops = 0;<br />
      uiReturn = waveInPrepareHeader(hWaveInDevice, &(WaveHeaders[uiCounter]),<br />
               sizeof(WAVEHDR));<br />
      if (uiReturn != MMSYSERR_NOERROR )<br />
      {<br />
         sprintf(szTempString, "Error %d preparing header %d.",<br />
               uiReturn, uiCounter);<br />
         MessageBox(0, szTempString, "Wave Data Error", MB_OK);<br />
         return(4);<br />
      }<br />
   }<br />
<br />
   MessageBox(0, "Allocated and prepared all buffers - cleaning up!",<br />
         "All successful!", MB_OK);<br />
   // Problem not repeated - clean up & exit!!!<br />
   // OK, I don't clean up - hopefully Windows does!!!<br />
<br />
   return 0;<br />
}