Re: getting 22050 Hz sample rate on Bronze PowerBook G3
Re: getting 22050 Hz sample rate on Bronze PowerBook G3
- Subject: Re: getting 22050 Hz sample rate on Bronze PowerBook G3
- From: "Laurent" <email@hidden>
- Date: Wed, 20 Mar 2002 12:21:53 -0800
There is a sample code located in DefaultOutputSample (the one using SRC.)
It's pretty easy to insert a SRC audio unit to convert to the supported hw
features. If you don't output to what the hw support, then nada, zip,
nothing will come out.
LdS
----- Original Message -----
From: "Phil Burk" <email@hidden>
To: <email@hidden>
Sent: Wednesday, March 20, 2002 11:04 AM
Subject: getting 22050 Hz sample rate on Bronze PowerBook G3
>
I am developing an implementation of PortAudio for Mac OS X CoreAudio.
>
(PortAudio is a free open-source cross platform audio API for Windows,
Mac,
>
Linux, BeOS, Solaris, SGI, etc.) I am really enjoying the low latencies of
>
CoreAudio and I like the CoreAudio API the best of all the systems I have
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tried.
>
>
But I am having a problem with getting 22050 Hz sample rate on a Bronze
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PowerBook G3. A rate of 22050 Hz is supported under OS 9 SoundManager but
I
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can't get it to work under OS X. I am testing for support using:
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>
AudioDeviceGetProperty(deviceID, 0, isInput,
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kAudioDevicePropertyStreamFormatSupported, &outSize,
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&formatDesc );
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It passes for 44100 but not for 22050 so I think I am making the call
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correctly. Is it not supported because the device is shared?
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Do I need to do the sample rate conversion myself, or is there something
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simple that I am not understanding?
>
>
Phil Burk
>
http://www.portaudio.com/
>
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