Re: General question
Re: General question
- Subject: Re: General question
- From: William Stewart <email@hidden>
- Date: Tue, 4 Nov 2008 18:21:20 -0800
On Nov 4, 2008, at 5:10 PM, Daniel Birns wrote:
Two questions:
My application will do automatically change the (HAL/preamp) input
volume, and adjust for this later in the playback process. I could
use some advice about how best to accomplish this.
To take a simple example: During recording my input AudioUnit
determines that the volume needs to be higher. So I change the HAL
input volume (not the recorder trim value) up by, say 6 db at time
t. (I know most devices don't support this yet -- but the built-in
mic does, and I'm working with manufacturers on getting their
support.) Later, during playback, from time 0 to time t, I will add
automatically add 6 db gain to the audio. I need only record the
time (t) and the delta in volume (+6db) during the record process,
and I need to get this information back later during playback or
processing. Not a lot of data.
Questions:
1) Where can I store this volume adjustment (time/db) information?
In track automation? in some data chunk in the wav file? In midi
somehow?
2) Can an AudioUnit access HAL objects? For example, the audio unit
usually has an opaque input source. Can I discover what that source
is and operate on it?
nope - you have no idea where the input comes from - could be a file,
could be generated, could be from a mic, etc...
3) Does apple provide SDKs for GarageBand and/or Logic so I can
provide (non AU) plug-ins, if my product needs it for ease-of-use?
GB and Logic both host audio units
My eternal gratitude to the soul who is able to set me on the right
track :-)
--Daniel
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