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Re: Bug in IOAudioStream?
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Re: Bug in IOAudioStream?


  • Subject: Re: Bug in IOAudioStream?
  • From: BlazeAudio Developer <email@hidden>
  • Date: Thu, 18 Aug 2005 17:09:10 +0530

At 12:21 AM 8/16/2005, Shaun Wexler wrote:
On Aug 15, 2005, at 11:42 AM, Jeff Moore wrote:

Looking at the IORegistry I see that all three streams are 
present, but the IOAudioStreamStartingChannelNumber property for 
the third stream is missing.

This is why the HAL ignores this third stream. That property is 
vital so that the HAL knows what order to present the streams in 
the IOProc.

FWIW, this is also one of the bugs in Digidesign's CoreAudio user- land driver.  It doesn't set the starting channel number of its 
streams; they all report 0.

As I mentioned in my other message, the driver cannot set this property. The driver can set the starting channel Id, but not the starting channel number.

  This can wreak havoc on app's which 
depend on the property.  As a workaround I simply rely on the HAL to 
give me a proper buffer list, and parse from that.

Understood!

Thanks.
Devendra.
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References: 
 >Audio clipping (From: Jonathan Lott <email@hidden>)
 >Re: Audio clipping (From: Jeff Moore <email@hidden>)
 >Bug in IOAudioStream? (From: BlazeAudio Developer <email@hidden>)
 >Re: Bug in IOAudioStream? (From: Jeff Moore <email@hidden>)
 >Re: Bug in IOAudioStream? (From: Shaun Wexler <email@hidden>)

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