Re: Audio driver outside kernel
Re: Audio driver outside kernel
- Subject: Re: Audio driver outside kernel
- From: "try another" <email@hidden>
- Date: Mon, 07 Nov 2005 21:02:40 +0000
I was told that the only way to write a CoreAudio driver was via a kext. Is
this a new API?
So I can write a user-land driver for an audio "device" using the
<CoreAudio/AudioHardwarePlugIn.h> API?
Thanks,
This is really good news.
From: Jeff Moore <email@hidden>
To: CoreAudio API <email@hidden>
Subject: Re: Audio driver outside kernel
Date: Mon, 7 Nov 2005 11:59:47 -0800
On Nov 7, 2005, at 8:11 AM, try another wrote:
I have been studying the PhantomAudioDriver sample in order to write my
own audio driver. I see that the timerFired (IOTimerEventSource) is
simulating a DMA interrupt. When this "interrupt" occurs, it means that
the currentBlock has been transferred.
I would like to do this from a userland application. Any suggestions on
how I could do this?
User-land APIs have many timer APIs. Which you use depends on many
factors.
I thought of sharing the outputBuffer and the currentBlock with the
userland app, but I would need to modify the userclient. I don't think I
have access to it; it's provided for me by the IOAudioDevice?
The other problem with this approach is: how do I timestamp the
wrap-around of the ring buffer from the userland app?
Any recommendations?
The IOAudio family is for kernel drivers. You won't be using any of it's
constructs in a user-land driver. In fact, user-land drivers are very
different beasts than IOAudio drivers and are defined by the API in
<CoreAudio/AudioHardwarePlugIn.h>. While it's entirely feasible to use a
model like what the IOAudio family uses, the code you need to write to
implement it is very different.
--
Jeff Moore
Core Audio
Apple
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