audio input/output help
audio input/output help
- Subject: audio input/output help
- From: Nigel Redmon <email@hidden>
- Date: Thu, 18 Oct 2007 11:45:04 -0700
I hate to ask these types of questions, but I'm time limited ("ship
this week" they say :-/), and I'd appreciate any help in cutting
directly to the chase...
I've taken over a project that uses Portaudio on PC and Mac. It
mostly works, except when I use my digital mixer (Tascam DM-3200)
with firewire interface as both input and output. Maybe something to
do with 24 channels each way, but the point is I don't have time to
figure out the problem which ultimately might find me down at the
core audio level anyway, so I'd like to just ditch it and go with
core audio.
So far, I figured out how to find all the input and output devices,
with numbers of channels and other properties, and that works fine.
Now to audio input and output...
My understanding is that I need to work at the HAL level, since I
need input. My needs in a nutshell:
This is a multichannel speaker calibration app. There are an
arbitrary number of sets of arbitrary number of speakers, each of
which may be connected to an arbitrary output device (that sounds
more complicated than it is--the idea is that an recording engineer
might have a speaker configuration for 5.1 mix down and a
configuration for stereo--even 10.2, etc.; he may have some of these
configuration split over multiple output devices).
Input is always a single channel (from a calibrated mic), device and
channel selected by the user. Output is (mostly) on a single channel
as well (noise pulses and sweeps--you can only calibrate one speaker
at a time). There is stereo output as well, just for simple audio
cues--because it sounds good that way--but the needs are pretty
simple overall. The app assumes a fixed 44.1 kHz on the software end,
so I'd have to have sample rate conversion on input and output to
ensure that rate on the app side.
Can someone recommend some example code that cuts right to this sort
of thing? Again, sorry to ask this sort of basic question, but I'd
appreciate any help in getting something together (and debugged)
quickly.
Thanks,
Nigel
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