THANK YOU!!!! Re: Re: Accessing a USB 1.0 audio device

I just knew it had to be simple;)
[ Now how often have we all said that ;?]
Now just have to wait for Presidents' Day so I'll have time to play.
(thanks George&Abe)

Glenn Dixon wrote:
> Hi Richard,
>
> Sound and video sources, including your USB microphone,
> may be accessed through the WINMM.DLL (Windows
> Multi-Media)
> Searching the web with WINMM.DLL gives some good info.
> Basically, you ask the DLL to enumerate what sound sources
> are available, and your USB mike should appear in the
> list (along with CD drive, etc.). You then open the
> device and get a handle. When you open it, you can
> specify the format you want the data in (many formats are
> defined and the DLL will tell you which ones are supported
> for your microphone). When you open the file (or later
> on) you specify how you want the data sent to you: what
> size block (which determines how often you get new data)
> how many blocks and where they are, and how you are
> notified when new data is ready (via callback, or by
> windows message, for example).
>
> You have commands to start the stream, stop it, set
> volume, find recording status etc. The stream is
> presented to you as a series of memory blocks, and a
> popular way to handle the stream is by setting up two
> blocks. The DLL fills one as you process the other, then
> you flip-flop when new data are available (double
> buffering).
>
> I've posted a code snippet that does a similar thing: it
> opens a speaker for playing sound, accepts input from a
> DSP card I designed, then plays the sound. It uses triple
> buffering: www.madengineer.com/mmonkey/monitor.f
> This file won't compile as it depends on other files, but
> hopefully you can follow the procedure. Getting an input
> stream with the WaveIn functions is very similar.
>
> Hope this helps,
> Glenn
>
>
>
>
>
>
>
> On Sat, 24 Jan 2004 11:45:51 -0600
> Richard Owlett <rcowlett_at_atlascomm.net> wrote:
>
>>Jerry Avins wrote:
>>
>>>Richard Owlett wrote:
>>>
>>> ...
>>>
>>>
>>>
>>>>I have the driver and it works fine.
>>>>What I want to do is access it from Swiftforth.
>>>
>>>
>>>I'm obviously not the one to give you a good answer, but
>>>before anyone
>>>can, you'll have to reveal what the microphone device
>>>"looks like" to
>>>the system. Is it a bit stream? A file?
>>
>>That's would be part of the info I need ;}
>>What I know is its a USB 1.0 device conforming to USB
>>Audio 1.0.
>>WindowsXP correctly identifies it as AK5370.
>>
>>I suspect from file names that I'm looking for info on
>>usbmon.dll and usbui.dll.
>>
>>
>>
>>>You should be able to plug a mic
>>>into the sound card and use the output from there. It
>>>might be an easier
>>>interface.
>>>
>>
>>Probably, but I need to use USB as access to sound card is
>>physically non-optimal.
>>
>>>Jerry
>>
>>
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>
>
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Received on Tue Jan 27 2004 - 11:38:53 PST