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    <p>An ancient question, but here's an answer. It could definitely be trimmed if we were really going for conciseness, but this is a little bit less than 100 effective lines:</p> <pre><code>#include &lt;AL/al.h&gt; // OpenAL header files #include &lt;AL/alc.h&gt; #include &lt;list&gt; using std::list; #define FREQ 22050 // Sample rate #define CAP_SIZE 2048 // How much to capture at a time (affects latency) int main(int argC,char* argV[]) { list&lt;ALuint&gt; bufferQueue; // A quick and dirty queue of buffer objects ALenum errorCode=0; ALuint helloBuffer[16], helloSource[1]; ALCdevice* audioDevice = alcOpenDevice(NULL); // Request default audio device errorCode = alcGetError(audioDevice); ALCcontext* audioContext = alcCreateContext(audioDevice,NULL); // Create the audio context alcMakeContextCurrent(audioContext); errorCode = alcGetError(audioDevice); // Request the default capture device with a half-second buffer ALCdevice* inputDevice = alcCaptureOpenDevice(NULL,FREQ,AL_FORMAT_MONO16,FREQ/2); errorCode = alcGetError(inputDevice); alcCaptureStart(inputDevice); // Begin capturing errorCode = alcGetError(inputDevice); alGenBuffers(16,&amp;helloBuffer[0]); // Create some buffer-objects errorCode = alGetError(); // Queue our buffers onto an STL list for (int ii=0;ii&lt;16;++ii) { bufferQueue.push_back(helloBuffer[ii]); } alGenSources (1, &amp;helloSource[0]); // Create a sound source errorCode = alGetError(); short buffer[FREQ*2]; // A buffer to hold captured audio ALCint samplesIn=0; // How many samples are captured ALint availBuffers=0; // Buffers to be recovered ALuint myBuff; // The buffer we're using ALuint buffHolder[16]; // An array to hold catch the unqueued buffers bool done = false; while (!done) { // Main loop // Poll for recoverable buffers alGetSourcei(helloSource[0],AL_BUFFERS_PROCESSED,&amp;availBuffers); if (availBuffers&gt;0) { alSourceUnqueueBuffers(helloSource[0],availBuffers,buffHolder); for (int ii=0;ii&lt;availBuffers;++ii) { // Push the recovered buffers back on the queue bufferQueue.push_back(buffHolder[ii]); } } // Poll for captured audio alcGetIntegerv(inputDevice,ALC_CAPTURE_SAMPLES,1,&amp;samplesIn); if (samplesIn&gt;CAP_SIZE) { // Grab the sound alcCaptureSamples(inputDevice,buffer,CAP_SIZE); //***** Process/filter captured data here *****// //for (int ii=0;ii&lt;CAP_SIZE;++ii) { // buffer[ii]*=0.1; // Make it quieter //} // Stuff the captured data in a buffer-object if (!bufferQueue.empty()) { // We just drop the data if no buffers are available myBuff = bufferQueue.front(); bufferQueue.pop_front(); alBufferData(myBuff,AL_FORMAT_MONO16,buffer,CAP_SIZE*sizeof(short),FREQ); // Queue the buffer alSourceQueueBuffers(helloSource[0],1,&amp;myBuff); // Restart the source if needed // (if we take too long and the queue dries up, // the source stops playing). ALint sState=0; alGetSourcei(helloSource[0],AL_SOURCE_STATE,&amp;sState); if (sState!=AL_PLAYING) { alSourcePlay(helloSource[0]); } } } } // Stop capture alcCaptureStop(inputDevice); alcCaptureCloseDevice(inputDevice); // Stop the sources alSourceStopv(1,&amp;helloSource[0]); for (int ii=0;ii&lt;1;++ii) { alSourcei(helloSource[ii],AL_BUFFER,0); } // Clean-up alDeleteSources(1,&amp;helloSource[0]); alDeleteBuffers(16,&amp;helloBuffer[0]); errorCode = alGetError(); alcMakeContextCurrent(NULL); errorCode = alGetError(); alcDestroyContext(audioContext); alcCloseDevice(audioDevice); return 0; } </code></pre>
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    1. COI commend you for having the CLEANEST shutdown logic I have ever seen for OpenAL. Most other examples force OpenAL to emit complaints out to seterr
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