We help IT Professionals succeed at work.

We've partnered with Certified Experts, Carl Webster and Richard Faulkner, to bring you two Citrix podcasts. Learn about 2020 trends and get answers to your biggest Citrix questions!Listen Now

x

Microphone input

snkpilot
snkpilot asked
on
Medium Priority
870 Views
Last Modified: 2010-05-18
How do I receive microphone input using C++?
Comment
Watch Question

Commented:
I know of some C code that does this - I can point you to this if you like?

Commented:
What platform? Win32, Win16? Do you want to record it or just get the signal?
Commented:
Use wave in and mixer manager APIs, do something like that:

mixerOpen(...);   //open mixer device
mixerSetControlDetails(...);   //set microphone mixer control for recording

waveInOpen(...);   //open wave in device with callback to get recorded data
waveInPrepareBuffer(...);
waveInAddBuffer(...);
waveInStart(...);   //start recording

Not the solution you were looking for? Getting a personalized solution is easy.

Ask the Experts

Author

Commented:
Ronslow,
     alexxx's answer I think is going to do it for me but I
would always appreciate some more advice.  If you could point
me to the code that would be great.

Commented:
the waveIn system is nice, and much more powerful, but that
means you have to use low level stuff. To do it under win32
the simlest way is to use mci:

(mciHandleError is at the end)

// first you open the device :
      MCIERROR ret;

      ret = mciSendString ("open new type waveaudio alias wavedev",NULL,0,NULL);
      mciHandleError ("open",ret);

// Then if you need too, you can set the info.
      ret = mciSendString ("set wavedev channels 1 samplespersec 11025 bitspersample 8 format tag pcm time format milliseconds",NULL,0,NULL);
      mciHandleError ("set",ret);

// Then you start recording
// say you want 400 ms of sound, the notify will be later.
      mciHandleError ("record",mciSendString ("record wavedev from 0 to 400 overwrite notify",NULL,0,hwnd));      

// Now when it is finished it will notify you :
// ( In a wndproc )
      case MM_MCINOTIFY:
          mciHandleError ("stop",mciSendString ("stop wavedev",NULL,0,NULL));
        break;

// And you can save it to disk
      mciHandleError ("save",mciSendString ("save wavedev c:\\temp\\1.wav ",NULL,0,NULL));

// To make it simple, there is this :
static void mciHandleError (char *cmd,MCIERROR ret)
{
      if (ret==0)
            return;

      char errorstr[101];
      char outstr[101];

      mciGetErrorString (ret,errorstr,100);

      sprintf (outstr,"[%s] %s",cmd,errorstr);

      MessageBox (hWndTruster,outstr,"ERROR",MB_ICONSTOP|MB_OK);
}

Access more of Experts Exchange with a free account
Thanks for using Experts Exchange.

Create a free account to continue.

Limited access with a free account allows you to:

  • View three pieces of content (articles, solutions, posts, and videos)
  • Ask the experts questions (counted toward content limit)
  • Customize your dashboard and profile

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

OR

Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.