Re: AudioDevice AudioChannelLayout
Re: AudioDevice AudioChannelLayout
- Subject: Re: AudioDevice AudioChannelLayout
- From: Jeff Moore <email@hidden>
- Date: Wed, 22 Oct 2003 14:21:08 -0700
I agree that the driver should be able to inform the HAL about what the
channelization is. Sometimes it knows and at the very least it could
provide a reasonable default that the User can override in AMS. Such
support would make a good future direction for the IOAudio family.
On Oct 22, 2003, at 1:56 PM, Tommy Braas wrote:
Jeff,
Thank you for your quick response. I applied a setting using the Audio
MIDI Setup, and the channels had names. It is a shame that a sensible
default is not applied when installing the driver for the card.
At least we can now post a tech note on our website and Roxio's
website dealing with this issue.
Thanks again,
Tommy Braas
Sr. Software Engineer
Deep Sea Software
The Makers of CD Spin Doctor. 2
On Wednesday, October 22, 2003, at 12:54 PM, Jeff Moore wrote:
The User is the only one who can say how they wired up their system
and want it to be used. Consequently, one needs to use Audio MIDI
Setup to indicate the channel layout of an audio device to the system
before it can be reported back through the HAL.
On Oct 22, 2003, at 11:04 AM, Tommy Braas wrote:
Hi all,
I have a little problem regarding channel layouts in general, and
for the M-Audio Revolution 7.1 card in particular.
I am using the code attached below to get an AudioChannelLayout from
an audio device. In the case if the Revolution card, it reports that
it has 8 channels and that I should look at the
AudioChannelDescription
(kAudioChannelLayoutTag_UseChannelDescriptions) for each channel to
determine what type of channel it is (the channel bitmap is empty).
When I then proceed to examine each AudioChannelDescription, their
label tags are all set to kAudioChannelLabel_Unknown. It is
bewildering...
I need to be able to mix stereo audio into an n-channel buffer and I
want to be able to do it the right way. I am not using AudioUnits
currently as there is no time to implement that functionality right
now, but ultimately it is in that direction we're looking to take CD
Spin Doctor.
I am doing something wrong here, or is it common that audio devices
misrepresent themselves?
Hoping for a quick fix.
Kind regards,
Tommy Braas
Sr. Software Engineer
Deep Sea Software
The Makers of CD Spin Doctor. 2
--
Jeff Moore
Core Audio
Apple
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