Re: Audio Sources Types
Re: Audio Sources Types
- Subject: Re: Audio Sources Types
- From: RolandCorp R&D <email@hidden>
- Date: Tue, 11 Dec 2001 16:19:45 -0800
>
No there is no way to tell whether the port on a device is digital or
>
analog. Many transport layers, particularly USB (and probably FireWire too
>
since it hews closely to the USB Audio spec, but I don't know for sure),
>
don't provide this information.
Section 3.5.1 and Section 3.5.2 of the "Universal Serial Bus Device Class
Definition for Audio Devices" describe the functions of Input and Output
Terminals (ports).
The specification called "Universal Serial Bus Device Class Definition for
Terminal Types" further define how the descriptor of a USB audio device
reports the type of input or output terminal (line, mic, speaker, SPDIF, CD
player, etc.)
Documents online at:
http://www.usb.org/developers/devclass_docs.html
Isn't this what you need?
Regards,
Mike.
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| Mike Kent, Manager of Technical Relations |
| Roland Corporation |
| Email: email@hidden |
| Tel: (604)543-2973 Fax: (604)543-2983 |
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