Re: mic or line input selection?
Re: mic or line input selection?
- Subject: Re: mic or line input selection?
- From: Stephen Davis <email@hidden>
- Date: Fri, 6 Sep 2002 10:02:53 -0700
The Sound Prefs on 10.1 do not have an input selector, it was added for
10.2. In addition, there is a more complex setup app called "Audio
MIDI Setup" in the Application/Utilities folder. (I know you said you
don't have 10.2 but someday you will...)
stephen
On Friday, September 6, 2002, at 09:25 AM, Gary Scavone wrote:
Hi Mark,
The Sound Prefs on my titanium (OS 10.1.5) have no controls for
selecting the default input device. The allow me to select the output
device only. Please let me know if there is some "secret" panel or
something I am missing here. Thanks.
--gary
On Fri, 6 Sep 2002, Mark Cookson wrote:
The Sound Prefs panel is a sub-panel in the System Preferences
application. You can launch the System Preferences application via
it's menu entry under the "Apple" menu (the farthest left menu).
The Sound Prefs setting is what the user has set as the global
default
input device, which may or may not make sense as an input source in
your application.
It's probably best that you have some UI for choosing the input
source
in your application because requiring the user to make a global
change,
which is what Sound Prefs does, to their configuration just for your
application is generally not encouraged. Multiple applications can
be
recording simultaneously, and therefore changing the global input
device for just one application is problematic. If all applications
present their own interface for choosing the input source used in
their
application then there are no conflicts between applications and
input
sources.
If you always want to record from the default input source, that's
fine, but if you might like more options in where your users record
from, I strongly recommend that you have your own interface to allow
them to select the input source. Daisy has sample code showing how
you
can change input sources.
Regards,
Mark
On Thursday, September 5, 2002, at 08:21 PM, Gary Scavone wrote:
Hi Jeff,
Thanks for the info. Actually, I'd prefer that there be an external
app (gui) to make that setting ... it doesn't belong in my code.
But
I have no idea where the "Sound Prefs panel" is under OS-X. I don't
see any sort of control panel type thing in OS-X 10.1 (I know that
there is such in OS 9). I was told by Apple support that there
would
be such a thing in OS X 10.2, but I just bought this computer
(delivered in early July) and I don't have the cash to fork out for
an
upgrade that I think should have come with the machine (especially
for
a developer!).
--gary
On Thu, 5 Sep 2002, Jeff Moore wrote:
The kAudioDevicePropertyDataSource family of properties are what
you
want to use with the HAL API to select where the data for a given
device/stream comes from.
Note that the Sound Prefs panel and Audio MIDI Setup offer GUIs
for
this property. The Daisy and DisplayHALDeviceInfo sample code has
code
for getting and setting the values for this property.
On Thursday, September 5, 2002, at 03:22 PM, Gary Scavone wrote:
I have a new titanium, OS-X 10.1, with both a line input on the
back
and an internal microphone. Is there a way provided by the
CoreAudio
API to select the input source? At the moment, it only uses the
line
input on the back.
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--
-------------------------------------------------
Gary Scavone
Center for Computer Research in Music & Acoustics
Stanford University
email@hidden
http://www-ccrma.stanford.edu/~gary/
-------------------------------------------------
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