[wdmaudiodev] Re: Raspberry Pi OTG Audio

  • From: "Genadi V. Zawidowski" <dmarc-noreply@xxxxxxxxxxxxx> (Redacted sender "mgs2001" for DMARC)
  • To: <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Sun, 4 Feb 2018 19:03:30 +0300

Total length of listed below descriptors not match to shown in header:

AC Clock Source Descriptor:
------------------------------
0x08    bLength
0x24    bDescriptorType
0x0A    bDescriptorSubtype
0x06    bClockID
0x01    bmAttributes
0x01    bmControls
0x00    bAssocTerminal
0x07    iClockSource   "48000Hz"

AC Clock Source Descriptor:
------------------------------
0x08    bLength
0x24    bDescriptorType
0x0A    bDescriptorSubtype
0x05    bClockID
0x01    bmAttributes
0x01    bmControls
0x00    bAssocTerminal
0x08    iClockSource   "48000Hz"

AC Input Terminal Descriptor:
------------------------------
0x11    bLength
0x24    bDescriptorType
0x02    bDescriptorSubtype
0x01    bTerminalID
0x0101  wTerminalType   (USB Streaming)
0x00    bAssocTerminal
0x05    bCSourceID
0x02    bNrChannels   (2 channels)
0x00000003      bmChannelConfig
0x00    iChannelNames
0x03    bmControls
0x09    iTerminal   "USBH Out"

AC Input Terminal Descriptor:
------------------------------
0x11    bLength
0x24    bDescriptorType
0x02    bDescriptorSubtype
0x02    bTerminalID
0x0200  wTerminalType   (Input Undefined)
0x00    bAssocTerminal
0x06    bCSourceID
0x02    bNrChannels   (2 channels)
0x00000003      bmChannelConfig
0x00    iChannelNames
0x03    bmControls
0x0A    iTerminal   "USBD Out"

AC Output Terminal Descriptor:
------------------------------
0x0C    bLength
0x24    bDescriptorType
0x03    bDescriptorSubtype
0x04    bTerminalID
0x0101  wTerminalType   (USB Streaming)
0x00    bAssocTerminal
0x02    bSourceID
0x06    bCSourceID
0x0003  bmControls
0x0B    iTerminal   "USBH In"

AC Output Terminal Descriptor:
------------------------------
0x0C    bLength
0x24    bDescriptorType
0x03    bDescriptorSubtype
0x03    bTerminalID
0x0300  wTerminalType   (Output Undefined)
0x00    bAssocTerminal
0x01    bSourceID
0x05    bCSourceID
0x0003  bmControls
0x0C    iTerminal   "USBD In"


-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Robert Bielik
Sent: Sunday, February 4, 2018 6:22 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: Raspberry Pi OTG Audio

Hi Genadi, et al,

In dump only partial listing of NODE descriptors array. I think, MAC is
weak
in checking.

Ok, thanks. Although I'm not USB savvy enough to know what you mean. There
should then theoretically be a way forward ? I've reproduced the issue with
the libusbgx library (https://github.com/libusbgx/libusbgx/issues/24). Some
pointer where to look for information what is missing would be very much
appreciated. It feels like I've vaccuumed the internet this weekend for
this.

Regards
/Robert
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