real time voice capture
real time voice capture
- Subject: real time voice capture
- From: "Tim Dorcey" <email@hidden>
- Date: Wed, 4 Jun 2003 12:33:04 -0700
Can anyone point me to documentation or sample code for recording a
contiguous sequence of 50 msec audio samples in OSX? The documentation
search at developer.apple.com has me quite stumped. I can find the Core
Audio architecture diagram, and a lot of stuff for writing device drivers,
but am somehow not finding the root of the Core Audio documentation.
I have a Carbon application which uses SPBRecord to do what I need, but am
getting very mysterious results on some OSX systems. OSX systems seem to
ignore our SPBSetDeviceInfo request for mono recording, so I have been
averaging the 2 stereo channels, if that's what the device returns. This
works fine on some systems, but I get a "Darth Vader" voice effect on
others. Picking one or the other of the channels did not seem to help.
Other odd thing, is I use the SGSettingsDialogue to let users configure the
audio input device, and some have discovered that switching the
(playthrough) Speaker setting Off and On a few times fixes the problem, but
this does not work for all.
I was thinking maybe simplest thing is to re-write the capture code to use
OSX Core Audio, but can't even get off square 0 to find the documentation.
Am I right to guess that this will be relatively easy to drop into a mach-o
build that is otherwise Carbon compliant? Or had I better keep pressing to
find why the Carbon capture does not work?
Thanks for any help,
Tim
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