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kAudioDevicePropertyStreamFormatMatch rate is zero in Panther
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kAudioDevicePropertyStreamFormatMatch rate is zero in Panther


  • Subject: kAudioDevicePropertyStreamFormatMatch rate is zero in Panther
  • From: "Phil Burk" <email@hidden>
  • Date: Wed, 19 Nov 2003 14:39:22 -0800

Does anyone know the status of the bug demonstrated in this letter from July
18?

http://lists.apple.com/archives/coreaudio-api/2003/Jul/18/halpatherformatmatchingb.001.txt

I cannot find any further discussion of it.

It appears that Panther returns a ZERO sample rate for

AudioDeviceGetProperty ( ..., kAudioDevicePropertyStreamFormatMatch, ...)

while earlier versions returned a reasonable match.
This may only affect USB devices such as the iMic.

I believe that this new bug is the cause of some failures of PortAudio code
under Panther. Several applications are using PortAudio, including Audacity,
JSyn, PD, etc. so I would like to know how to fix this.

Thanks,
Phil Burk
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  • Follow-Ups:
    • Re: kAudioDevicePropertyStreamFormatMatch rate is zero in Panther
      • From: Jeff Moore <email@hidden>
    • Re: kAudioDevicePropertyStreamFormatMatch rate is zero in Panther
      • From: Michael Thornburgh <email@hidden>
References: 
 >Looking for PlayEffect example code (From: Robert Grant <email@hidden>)

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