Re: using AUMatrixMixer & format conversions
Re: using AUMatrixMixer & format conversions
- Subject: Re: using AUMatrixMixer & format conversions
- From: William Stewart <email@hidden>
- Date: Thu, 23 Oct 2008 19:32:09 -0700
On Oct 23, 2008, at 12:40 AM, Brian Willoughby wrote:
What about sample rate conversion, Bill? I told John off-list that
I thought the mixer would not automatically handle SRC, but that I
could not remember for sure. I believe he would appreciate a
confirmation that sample rate as well as bus and channel conversions
will be handled transparently.
Brian Willoughby
Sound Consulting
No SRC - the matrix mixer assumes that all of its inputs and outputs
are at the same sample rate
On Oct 23, 2008, at 1:30 AM, John Clayton wrote:
but they all have to be of the same ASDB format, right? I saw
somewhere else on this list that the mixer is pretty much just doing
channel mapping, which implied that it wasn't performing format
conversion.
Yes, but No. ASBD format in that it is float 32, same sample rate. No,
in that num channels is a part of the ASBD, so that is as different as
you want.
Ultimately, you'd need to decide upon the sample rate that you are
going to mix at, and then add an AUConverter unit on each input that
doesn't conform to that sample rate. The AUConverter unit can do any
number of channels In to Out, but I would set it up to just do an SRC
(and keep the num channels the same)
Thanks
--
John Clayton
Skype: johncclayton
On 23/10/2008, at 3:01 AM, William Stewart wrote:
yep - the matrix mixer can be configured to any number of buses
with any number of channels
On Oct 21, 2008, at 11:19 PM, John Clayton wrote:
Hi All,
I'm wondering if an AUMatrixMixer has the capability to accept
different inputs on its input busses. E.g. can I put 5 channels
of 44.1k into Bus 0 and 2 (stereo) channels of 8k into Bus 1 and
expect things to work - or am I asking for trouble? Another way
of asking this I suppose, is; will it perform the format and rate
conversion tasks for me - or do I have to make sure all the input
*and* output busses are set to the same format/channel and sample
rate?
Reason:
I have a situation where I'm going to be feeding audio from QT
movie files into coreaudio units. I'm extracting audio via the
MoveAudioExtraction API, which for any given movie creates a
summary mix of all of the audio tracks contained in the movie, I
then need to push these into a ducking component (that I'm going
to write).
Thanks
--
John Clayton
Skype: johncclayton
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