SlimDX audio, newb

FenixRoA · 2010-02-17T18:10:01

Hello, I am using the SlimDX framework for the first time in a Windows 7 x64 environment. I think I've got the project set to compile correctly (target is Debug/x64). I am using the following code as a test. The object of the test is to write a number of samples from a capture device to a file on the hard drive. Below is my code. /*I've tried enumerating all the capture devices returned by the DirectSoundCapture class. The final entry (#3, zero-based) was the stereo mix. The others were primary, microphone, and CD Audio, in that order. I've also tried Primary, and Microphone and those fail in the same way. My goal is to sample the stereo mix.*/ var dsc = new SlimDX.DirectSound.DirectSoundCapture(SlimDX.DirectSound.DirectSoundCapture.GetDevices()[3].DriverGuid); var wf = new SlimDX.Multimedia.WaveFormat(); wf.BitsPerSample = 16; wf.BlockAlignment = (short)(wf.BitsPerSample/8); wf.Channels = 2; wf.FormatTag = SlimDX.Multimedia.WaveFormatTag.Pcm; wf.SamplesPerSecond = 44100; wf.AverageBytesPerSecond = wf.SamplesPerSecond * wf.BlockAlignment * wf.Channels; var cbd = new SlimDX.DirectSound.CaptureBufferDescription(); cbd.Format = wf; cbd.BufferBytes = 8192; cbd.WaveMapped = false; System.Windows.Forms.MessageBox.Show("Creating Buffer..."); cb = new SlimDX.DirectSound.CaptureBuffer(dsc, cbd); System.Windows.Forms.MessageBox.Show("Buffer Created!"); cb.Start(false); short[] samples = new short[5000]; cb.Read<short>(samples, 0, true); cb.Stop(); System.IO.BinaryWriter bw = new System.IO.BinaryWriter(System.IO.File.Open("test.hex", System.IO.FileMode.Create, System.IO.FileAccess.Write, System.IO.FileShare.None)); for (int x = 0; x < samples.Length; x++) { bw.Write(samples[x]); } bw.Close(); System.Windows.Forms.MessageBox.Show("Done!"); This code is placed in a form_load method. Whenever I run this code I get the "Creating Buffer..." messagebox. But as soon as I OK that, the form loads as regular without showing the "Buffer Created!" or "Done!" messages. Also, the text.hex file is never created. What am I doing wrong?

Graphics and GPU Programming Programming

Started by FenixRoA February 17, 2010 11:37 AM

12 comments, last by FenixRoA 14 years, 2 months ago

Mike.Popoloski

3,259

February 17, 2010 05:02 PM

My guess is that it doesn't like your WaveFormat, but I don't know for sure. The DirectX documentation doesn't say much about this particular method.

Mike Popoloski | Journal | SlimDX

FenixRoA

142

Author

February 17, 2010 05:12 PM

Does anyone know what the restrictions on waveformats are then? Or maybe you know a safe one to use that will work in my case?

Mike.Popoloski

3,259

February 17, 2010 05:27 PM

Looking at it, I think that you need to multiply your BlockAlignment by 2, in which case your AverageBytesPerSecond does't need to be multiplied by Channels anymore. From the DirectX documentation for WAVEFORMATEX:

Quote:Block alignment, in bytes. The block alignment is the minimum atomic unit of data for the wFormatTag format type. If wFormatTag is WAVE_FORMAT_PCM or WAVE_FORMAT_EXTENSIBLE, nBlockAlign must be equal to the product of nChannels and wBitsPerSample divided by 8 (bits per byte).

Mike Popoloski | Journal | SlimDX

FenixRoA

142

Author

February 17, 2010 06:10 PM

That did it!

I cannot express how happy it makes me that it now works (although I still haven't gone through the output).

However I'm still unhappy with my DX problem. Does anyone know of a good way to check if my DX is running in debug mode from my program?

SlimDX audio, newb

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