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Re: Using vDSP in audio USB Driver
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Re: Using vDSP in audio USB Driver

  • Subject: Re: Using vDSP in audio USB Driver
  • From: "support (One Red Dog Media)" <email@hidden>
  • Date: Tue, 21 Aug 2012 21:26:01 +0000
  • Thread-topic: Using vDSP in audio USB Driver
Hi

You have to use OSvKernDSPLib, which is the kernel space version of the accelerate framework. Alternatively you can use the SIMD intrinsics directly (or even inline assembler which is a bit easier now that there's only i386 and not so much PPC). 

Sent from my iPhone

On 21/08/2012, at 23:44, "Alexis Zbik" <email@hidden> wrote:

thanks peter!

I just try to add some vDSP deature and i link my driver with the accelerate framework ...

When i try to load my kext, i get link failure with the DSP method i used ...

(kernel) kxld[com.MySoftwareCompany.driver.SampleUSBAudioPlugin]: The following symbols are unresolved for this kext:
(kernel) kxld[com.MySoftwareCompany.driver.SampleUSBAudioPlugin]:     _vDSP_vadd
(kernel) Can't load kext com.MySoftwareCompany.driver.SampleUSBAudioPlugin - link failed.
(kernel) Failed to load executable for kext com.MySoftwareCompany.driver.SampleUSBAudioPlugin.
(kernel) Kext com.MySoftwareCompany.driver.SampleUSBAudioPlugin failed to load (0xdc008016).
(kernel) Failed to load kext com.MySoftwareCompany.driver.SampleUSBAudioPlugin (error 0xdc008016).
Failed to load /System/Library/Extensions/SampleUSBAudioPlugin.kext - (libkern/kext) link error.

if you habe some tips ...

2012/8/21 support (One Red Dog Media) <email@hidden>
Hi

>
> So I would to know if i can use the Accelerate framework in kernel mode?

Yes

regards
peter




--
Alexis ZBIK
Mac & Audio Developer

A-Volute
25, rue Corneille
59100, Roubaix, France

email@hidden


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References: 
 >Using vDSP in audio USB Driver (From: Alexis Zbik <email@hidden>)
 >Re: Using vDSP in audio USB Driver (From: "support (One Red Dog Media)" <email@hidden>)
 >Re: Using vDSP in audio USB Driver (From: Alexis Zbik <email@hidden>)

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