🚀 go-pugleaf

<ghislain.ruy@ieee.org> wrote in message news:3B48CDA3.CE2AAD36@ieee.org...
> Hello,
>
> does somebody know how to retrieve raw samples from a sound card in
> order to process them ?
> I had a look to winapi but it's quite cumbersome and I would prefer
> something like a linux driver (just read a file for example). Is there a
> dll to do the job ?
> Is it possible via the media player trough undocumented class members or
> so ?

Sorry about the delay replying... been messing around with news readers and
servers.

Anyway, there are two main ways to access the sound card: MMSystem and
DirectSound.  I prefer the first, because I've already got lots of code to
refer to.

Here's the basic sequence I use to record sound:

1: Prepare a WAVEFORMATEX struct to define the sample format
   (rate, bits, channels, etc)

2: Call waveInOpen() to open the input device

3: prepare a couple of WAVEHDR structs by allocating buffers,
   then calling waveInPrepareHeader() on both of them

4: Call waveInAddBuffer() to add both buffers to the record
   queue, then waveInStart() to start it running

5: message loop.  Wait on MM_WIM_DATA messages, process them
   (copy the data out of the buffer, then add it back into
   the queue with waveInAddBuffer)

6: when done, call waveInStop() and wait until all buffers
   have been returned

7: call waveInReset(), waveInUnprepareHeader() on both buffers,
   the waveInClose() to release the port.


Hope this helps.  I have some code I can send you if you get bogged down.


--
Corey Murtagh
The Electric Monk
"Quidquid latine dictum sit, altum viditur."