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POwaveInProc / Windows audio question
 

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  1. POwaveInProc / Windows audio question
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    <p>I'm using the Windows API to get audio input. I've followed all the steps on MSDN and managed to record audio to a WAV file. No problem. I'm using multiple buffers and all that. I'd like to do more with the buffers than simply write to a file, so now I've got a callback set up. It works great and I'm getting the data, but I'm not sure what to do with it once I have it.</p> <p>Here's my callback... everything here works:</p> <pre><code>// Media API callback void CALLBACK AudioRecorder::waveInProc(HWAVEIN hWaveIn, UINT uMsg, DWORD dwInstance, DWORD dwParam1, DWORD dwParam2) { // Data received if (uMsg == WIM_DATA) { // Get wav header LPWAVEHDR mBuffer = (WAVEHDR *)dwParam1; // Now what? for (unsigned i = 0; i != mBuffer-&gt;dwBytesRecorded; ++i) { // I can see the char, how do get them into my file and audio buffers? cout &lt;&lt; mBuffer-&gt;lpData[i] &lt;&lt; "\n"; } // Re-use buffer mResultHnd = waveInAddBuffer(hWaveIn, mBuffer, sizeof(mInputBuffer[0])); // mInputBuffer is a const WAVEHDR * } } // waveInOpen cannot use an instance method as its callback, // so we create a static method which calls the instance version void CALLBACK AudioRecorder::staticWaveInProc(HWAVEIN hWaveIn, UINT uMsg, DWORD_PTR dwInstance, DWORD_PTR dwParam1, DWORD_PTR dwParam2) { // Call instance version of method reinterpret_cast&lt;AudioRecorder *&gt;(dwParam1)-&gt;waveInProc(hWaveIn, uMsg, dwInstance, dwParam1, dwParam2); } </code></pre> <p>Like I said, it works great, but I'm trying to do the following:</p> <ul> <li>Convert the data to short and copy into an array</li> <li>Convert the data to float and copy into an array</li> <li>Copy the data to a larger char array which I'll write into a WAV</li> <li>Relay the data to an arbitrary output device</li> </ul> <p>I've worked with FMOD a lot and I'm familiar with interleaving and all that. But FMOD dishes everything out as floats. In this case, I'm going the other way. I guess I'm basically just looking for resources on how to go from LPSTR to short, float, and unsigned char.</p> <p>Thanks much in advance!</p>
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      1. POwaveInProc / Windows audio question
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    1. COWow, thanks for all the help! I know it's a pretty general question so I appreciate the specific answers. Back to work and will mark an answer/respond soon.
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    2. COOne word of caution: The wave APIs are quite finicky - you can't do too much work inside the wave procedure. The warning on MSDN (http://msdn.microsoft.com/en-us/library/aa909756.aspx) is quite clear: calling wave* functions (like waveInAddBuffer) from a callback is highly likely to deadlock.
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      1. POwaveInProc / Windows audio question
      1. USLarry Osterman
 

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