Re: Using the new "Input" bus of the DefaultOutputUnit
Re: Using the new "Input" bus of the DefaultOutputUnit
- Subject: Re: Using the new "Input" bus of the DefaultOutputUnit
- From: Robert Grant <email@hidden>
- Date: Wed, 12 Nov 2003 07:39:07 -0500
Hi Brad,
Yeah - I spotted that right before I went to bed last night - my eyes
must have drifted from reading the EnableIO description to the HasIO
property. I've fixed it now:
status = AudioUnitSetProperty(output,
kAudioOutputUnitProperty_EnableIO,
kAudioUnitScope_Input,
1,
&data,
sizeof(data) );
But I'm still getting an InvalidProperty error. I even tried turning
off Output with the same problem....
Also isn't Metering now available for the StereoMixer? I've tried
turning that on but it's also giving me InvalidProperty. I'm running
Panther and QT 6.4 but I'm starting to think I've got the old
DefaultOutputUnit and the old StereoMixer....? I've definitely got the
new MatrixMixer (though that's a whole other area for confusion for me
:-))
Thanks,
Robert.
On Nov 12, 2003, at 12:21 AM, Brad Ford wrote:
_HasIO is a getter only. If you want to set up which busses are
active on an output unit, you need to use the setter equivalent of the
_HasIO property, _EnableIO.
As for why you are getting a bus count of 1 on your DefaultOutputUnit,
I would guess it's because you haven't enabled the input side of your
output unit. By default, AudioOutputUnits are instantiated as
output-only units. Input is disabled.
Also, what is your default device? Is it a USB device? If it is, AMS
is tricking you--it's actually coalescing two AudioDevice's into one
behind your back, since USB devices present their input and their
output as two separate devices.
HTH.
-Brad Ford
QuickTime Engineering
On Nov 11, 2003, at 6:58 PM, Robert Grant wrote:
Researching the AudioUnitRender issue in the other thread helped me
find this property for enabling Input on the OutputUnit:
status = AudioUnitSetProperty(output,
kAudioOutputUnitProperty_HasIO,
kAudioUnitScope_Input,
1,
&data,
sizeof(data) );
But setting this property gets me an InvalidProperty error...
I think I interpreted this correctly: "scope input, element 1 =
input" but the comments in the header file are a little hard to
parse...
But perhaps it's getting too late! :-)
Robert.
On Nov 11, 2003, at 9:01 PM, Robert Grant wrote:
I'm also trying to use the new input capability of the
DefaultOutputUnit but I'm not sure how it's supposed to work...
actually I don't think it is working.
From the docs: "Any of these I/O units may be used to pull input
data from its associated audio device, through any number or
combination of audio units or audio unit graphs, and output back
through the I/O unit. The I/O unit itself has two busses: 0 and 1,
where the 0 bus is designated as the output, and the 1 bus is the
input bus. The connections between the output of the 0 bus and the
audio device and the input of the 1 bus and the audio device are
made when the unit is associated with the device."
However when I query the bus count of the output unit I get only one
bus which is probably not the case despite the fact that AMS is
showing I have input and output enabled.
Should I get two buses reported for DefaultOutputUnit?
Thanks,
Robert.
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