On Aug 17, 2006, at 7:47 PM, Bob Wyttenbach wrote:
Has anyone written RB classes to handle simple audio io?
It depends what you mean by simple i/o.
I want to read from the microphone or line input for a simple
oscilloscope-like display.
Again, it really depends on what you mean by simple oscilloscope-like
display. If you're looking for the level of audio coming in, then
Real Capture Canvas can do what you want.
http://realcapture.com
If, however, you want something more sophisticated like calculating
the frequency of incoming audio (or really any other FFT-type task),
then you're going to have to get your hands (most likely very) dirty.
For Mac OS X, you'd need to dig into the CoreAudio API. I'm less
comfortable recommending the best solution on Windows.
Sending brief pulses out the headphone jack (to trigger external
equipment) would also be useful.
This is another task altogether. What kind of pulse? Would a sine
wave suffice? If so, I probably have some Mac code you could use for
this.
I need a solution for OSX and Windows.
Except for high level APIs (like QuickTime), audio usually requires
some heavy lifting. Additional platforms only increase that workload;
sometimes considerably.
I assume this must be done with declares to the system API, since
it doesn't seem to exist in RB itself.
Yes, probably so.
I'm comfortable working with declares if someone tells me what
belongs in them, but I'm surprised this functionality doesn't
already exist in RB.
I'm not surprised. It can get pretty complex. And many of those types
of users don't use REALbasic.
Have I missed it?
No, don't think so.
Regards,
Erick
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