Hello. Can you add the ability to control playback from the remote when connected to a Mac or PC via USB? Many devices can do this. I mean the functions stop, pause, play, next track, previous track.

Sounds to me as if this is only possible for a remote of a device like e.g. a CD-Player or Streamer which has such a playback function for content like CD-player or streamer.

The ADI-2 DAC/Pro is only a DAC without any own media or own storage or access to network storage with audio content.
How shall this work ? How should such a command trigger the application through USB ?

I personally do not know any such standard .. you ? Do you have a URL or a concrete example ?

jr.radnev wrote:

wedding.pixel_0w wrote:

Hello. Can you add the ability to control playback from the remote when connected to a Mac or PC via USB? Many devices can do this. I mean the functions stop, pause, play, next track, previous track.

If you use a software player, most have applications for Android and iOS - smartphone control.

That's what I do. This is very inconvenient. You need to unlock the iPhone and launch the application, only then you can switch the track or pause it. The hardware remote is much more convenient.

If I connect my PC to my Hegel's internal DAC with USB, I can control basic media player functions like play, pause, skip etc. from the Hegels remote control. Just like any other gaming keyboard or whatever. This works with windows sound drivers, maybe there is a hitch to combine it with ASIO drivers? It would be a really nice function to have.

Hmm, strange, when looking at the remote of this Topping D90 (picture from Amazon), then I do not see any knob for such a function:

I had assumed that you were already using IOKit/HID Manager to a degree as the play/pause USB Consumer Usage 0xCD element is already being captured by Roon - i.e. pressing play/pause on DAC remote controls causes roon to play/pause. But it’s quite possible that OS X simply traps this input and forwards it as a “spacebar” type UI event that plays/pauses almost all apps, as you suggested. This is why pressing space bar seems to universally play/pause almost any application? I wonder if OS X is likewise forwarding next/previous track as UI events as well?

All that said, the more robust solution is to directly use IOKit to catch these events. I think you just create queues to get notification of HID element value changes from the specified class of device (consumer class?) via HID manager, and associated callbacks. These are the 3 most common and important USB HID elements that DAC remotes seem to support, at least from the DACs I have owned:

0xB5 - Scan next track
0xB6 - Scan previous track
0xCD - Play/Pause

See http://www.usb.org/developers/hidpage/Hut1_12v2.pdf 42, section 15 for more info. The benefit of this is that roon core server could also catch these events and control output to the given USB device.

If it’s not obvious, this is extremely useful for all of us who use USB DACS(with or without amp) for quick playback control, including volume when force max volume/disable volume is set. For example, my DAC remote allows me to control volume (of my integrated amp), play/pause, next/previous track. Once I have a playlist set up in iTunes, Audirvana, etc all I need to control things is the DAC remote. If Roon could do this too then one doesn’t need to use the Roon app/remote to control playback once started.