Getting the USB device name of the USBSoundDevice #635
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nickverlinden
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Replies: 3 comments 2 replies
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Hi Nick, is this an USB string to be read? You can use the class |
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Well, i use a rather crude method of getting the usb audio interface. Everytime there is a USB change, i just try to get a new USBSoundBaseDevice like this: usb_change = m_pUSBHCI->UpdatePlugAndPlay ();
...
if (usb_change)
{
pSoundIn = new CUSBSoundBaseDevice (HAL_CIRCLE_AUDIO_SAMPLE_RATE, CUSBSoundBaseDevice::DeviceModeTXRX);It looks there is no function ->GetDevice() for pSoundIn. What do you think about this, is it too crude, should i change this? |
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Honestly I never used an USB sound device with USB Plug-and-Play. But the way,
you did it, seems to be the only possible way to me. So if it works, it's OK.
|
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Is there a way to access the USBString, or how do i get the device from the pSoundIn pointer? Using lsusb it looks like what i want is part of the interface descriptor. For example this is the Tascam Model 12. Also interesting to note is that i see the midi interface has it's own name (iInterface 10 Model 12 MIDI), this would also be very useful for me to get because i have multiple usb midi devices attached and it's always a guess which one is which because they are just known as umidi1, umidi2, ... But this is my esp32 based lsusb output, the audio interface in macOS appears under the name 'usb uac', but when you connect it to the mac a window appears with the custom name i gave the usb device. I cannot see this name anywhere in this output however, so i'm not actually sure where it is, but it must be there since macOS displays this name in the "Allow Device to Connect" window: |
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You can enumerate the control device of the USB audio streaming devices and display an eventual assigned USB string like that: #include <circle/usb/usbfunction.h>
#include <circle/usb/usbstring.h>
#include <circle/usb/usb.h>
for (unsigned nDevice = 1; 1; nDevice++)
{
CUSBFunction *pFunc = static_cast<CUSBFunction *> (CDeviceNameService::Get ()->GetDevice ("uaudioctl", nDevice, FALSE));
if (!pFunc)
{
break;
}
const TUSBInterfaceDescriptor *pDesc = pFunc->GetInterfaceDescriptor ();
assert (pDesc);
if (pDesc->iInterface == 0 || pDesc->iInterface == 0xFF) // no string assigned
{
continue;
}
CUSBString String (pFunc->GetDevice ());
if (String.GetFromDescriptor (pDesc->iInterface, String.GetLanguageID ()))
{
CLogger::Get ()->Write ("kernel", LogNotice, "USB audio streaming device #%u is %s",
nDevice, String.Get ());
}
}Unfortunately this will not work with USB MIDI devices and your esp32-based device should display "usb uac". Circle is not well prepared, when you want to handle (and distinguish) multiple USB audio devices of the same kind. To add support for this would take some time and I would have to get clear first, how this support could look like. |
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Hi Rene,
Is there any way to get the device name of the usb audio interface that is connected? I made a custom interface using an esp32 that has a specific name that i gave myself in the tinyusb header, and am trying to identify when it has been connected to my circle based project. I tried some things but didn't find a way yet.
Kind regards,
Nick
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