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Rockbox as a USB audio device?

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gevaerts:

--- Quote from: thomaspf on March 30, 2008, 12:42:30 AM ---Edit:  Now that I thought of it a bit more. Would it be possible to write a USB audio host stack? In that case you could use the media player as a source for external USB audio devices. That would be pretty nice too.

--- End quote ---

All of this is somewhere on my list of things I want to do some time, but as people said higher up, it's always dependent on what hardware a particular player has

nullstring:
Has any work been done on this?

Particular DAP's, such as the ipod 5G w/ a LOD and possibly a diymod would offer a high(ish) quality solution for an external USB DAC.


How hard do you think this would be to implement? I'd really like to see this.

I am gonna do some research on USB communication and audio drivers, but it seems to be a hard topic to google.
Feel free to share any insight of the correct direction to look in, etc.

gevaerts:
The specification for usb audio is at http://www.usb.org/developers/devclass_docs

Vchat20:
Regardless of sound quality, another possible pro would be to use the headphone amps in these players and possibly even use the players own volume control as an in-line volume control.

My laptop has a pretty lousy headphone amp that can only push comfortable volumes to the dinky little earbuds but my good over-the-ear cans are JUST audible at maxed out volume (often have to kick up the preamp in winamp's EQ to help as little as it can).

The Sansas (esp. the c200 line) would make a nice portable formfactor to act as a usb sound card and headphone amp. And then when it's not being used in that fashion it goes back to being an mp3 player.

If I had any programming expertise I'd jump on this myself. There is a patch up from some time back dealing in making a dummy usb audio stack which just showed up as an audio device to the host but didn't do anything else. Might be worth taking a look at?

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