Solved

Enable 4channel audio output on Maya 44 USB

Posted on 2009-05-18
2
453 Views
Last Modified: 2013-12-08
Hello,

I've got code that plays 4 different waveforms on the 4 outputs of a quadrophonic sound card. It works fine when using the SoundBlaster Audigy card inside my computer, but it fails when using the Maya 44 USB card with which it is intended to work. The output in this case is limited to just 2 channels (front left+front right), the other two (back left, back right) being muted. The code uses DirectX and initializes the buffer using the code below. I tried to look at the mixer of the Maya card, also at the configuration of speakers of it and everything seems to be right - no muting and quadrophonic speakers. How do I enable the other 2 channels, either by code or by clicking somewhere in Windows?

Thanks a lot
// Create buffer
  DSBUFFERDESC dsbd;
  WAVEFORMATPCMEX wfex;
  wfex.Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
  wfex.Format.nChannels = 4;
  wfex.Format.nSamplesPerSec = 44100L;
  wfex.Format.nAvgBytesPerSec = 352800L; 
  wfex.Format.nBlockAlign = 8;  /* Same as the usual */
  wfex.Format.wBitsPerSample = 16;
  wfex.Format.cbSize = 22;  /* After this to GUID */
  wfex.Samples.wValidBitsPerSample = 16;  /* All bits have data */
  wfex.dwChannelMask = SPEAKER_FRONT_LEFT | 
                       SPEAKER_FRONT_RIGHT | 
                       SPEAKER_BACK_LEFT |
                       SPEAKER_BACK_RIGHT;
  wfex.SubFormat = KSDATAFORMAT_SUBTYPE_PCM;  // Specify PCM  
 
  dsbd.dwSize = sizeof( dsbd);
  dsbd.dwFlags = DSBCAPS_CTRLVOLUME | DSBCAPS_STICKYFOCUS | DSBCAPS_CTRLPOSITIONNOTIFY;
  // Prepare sound for 200 milliseconds
  // NOTE: We must make sure that the number is always even 
  // because of the way we fill in the buffer
  const int nSamples = wfex.Format.nSamplesPerSec / 5 + (wfex.Format.nSamplesPerSec / 5)  % 2;
  dsbd.dwBufferBytes = nSamples * wfex.Format.nChannels * (wfex.Format.wBitsPerSample / 8);
  dsbd.dwReserved = 0;
  dsbd.lpwfxFormat = &wfex.Format;
  dsbd.guid3DAlgorithm = GUID_NULL;
  if (FAILED(intOutputSound.lpds->CreateSoundBuffer( &dsbd, &intOutputSound.lpBuffer, 0)) || 
      !intOutputSound.lpBuffer) 
      return false;

Open in new window

0
Comment
Question by:bovlk
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 26

Assisted Solution

by:PCBONEZ
PCBONEZ earned 500 total points
ID: 24502319
You do have all 4 RCA cables connected on the input side,,, yes?
Those wouldn't be there if you could get 4 channels through USB.

My reading suggests the install loads generic drivers that you then have to go in and update to the correct drivers manually.
0
 

Accepted Solution

by:
bovlk earned 0 total points
ID: 24578761
Yes, I have all 4 channels connected. I solved the problem by using ASIO instead of DirectX meanwhile so I'm not sure whom to award the points.
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Charge laptop battery without a laptop 8 380
Is COM supported from Apache 1 79
FMX TCameraComponent Problem 2 105
Recommendation vb6 to vb.net or others 14 240
Whether you've completed a degree in computer sciences or you're a self-taught programmer, writing your first lines of code in the real world is always a challenge. Here are some of the most common pitfalls for new programmers.
On Beyond Tools A conversation I recently had with the DevOps manager of a major online retailer really made me think about DevOps monitoring tools (https://www.onpage.com/devops-incident-management-tool/). The manager and I discussed how sever…
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel. Part 1 of this series discussed basic error handling code using VBA. http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…

734 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question