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Re: kAudioStreamPropertyTerminalType return values
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Re: kAudioStreamPropertyTerminalType return values


  • Subject: Re: kAudioStreamPropertyTerminalType return values
  • From: Jeff Moore <email@hidden>
  • Date: Thu, 13 Aug 2009 11:25:40 -0700

Think of the various lists as suggested return values, as the value for the terminal type may come from the list in either header. The value can also be driver specific and therefore not in either header.

Also, don't forget that a driver is also free to not specify any terminal type at all. Indeed, it is also possible that a device can say it has a SPDIF interface and still not support sending out AC-3 data.

In general, it is more reliable to identify the devices that support AC-3 output over SPDIF by looking for a device that has an output stream that supports the format, kAudioFormat60958AC3.


On Aug 13, 2009, at 3:55 AM, Ryan Walklin wrote:

I'm still working on my AC3 encoder driver, and was attempting to use kAudioStreamPropertyTerminalType to find SPDIF interfaces attached to my Mac. I was expecting it to return a value as defined in AudioHardware.h, ie kAudioStreamTerminalTypeDigitalAudioInterface or similar. However, after checking the HALLab source, I find it returns a terminal define in IOKit's AudioTypes.h. This works just as well, but I was wondering what the point of having the various terminal type defines in AudioHardware.h was, particularly as the header suggests these are returned when the terminal type is queried.


--

Jeff Moore
Core Audio
Apple



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 >kAudioStreamPropertyTerminalType return values (From: Ryan Walklin <email@hidden>)

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