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AN295: USB Audio Class Tutorial - Silicon Labs
https://www.silabs.com/documents/public/application-notes/AN295.pdf
The USB Audio class uses the isochronous transfer type to stream audio across a USB link. 2.1. USB Operational Overview When a USB device connects to a USB port, the host controlling the port retrieves information about the capabilities of a device through control transfers during a process called enumeration.
USB Audio 2.0 Drivers - Windows drivers | Microsoft Docs
https://docs.microsoft.com/en-us/windows-hardware/drivers/audio/usb-2-0-audio-drivers
The USB Audio 2.0 driver does not support clock selection. The driver uses the Clock Source Entity which is selected by default and never issues a Clock Selector Control SET CUR request. The Clock Selector Control GET …
Universal Serial Bus Device Class Definition for Audio …
https://www.usb.org/sites/default/files/audio10.pdf
USB Device Class Definition for Audio Devices Release 1.0 March 18, 1998 ii Scope of This Release This document is the 1.0 release of this device class definition.
Technical Note TN2274: USB Audio on the Mac
https://developer.apple.com/library/archive/technotes/tn2274/_index.html
Feature Units contain volume and mute controls which can logically map to volume, mute, and hardware play through controls on the Mac. When AppleUSBAudio creates input and output stream volume and mute …
Looking for clarification on USB Feature Unit Descriptors ...
https://social.msdn.microsoft.com/Forums/en-US/2a8bbd6b-aff9-4777-90ea-aef606349125/looking-for-clarification-on-usb-feature-unit-descriptors-and-their-revelance-in-windows-7
Hi there, I am developing a USB-to-analog audio device, and am seeing strange volume scaling behavior from Windows 7/Vista machines. The problem is not apparent with XP machines. When I move the volume slider in a Windows 7/Vista machine, the volume (I am looking at Set_Cur packets) moves in a ... · Can you mail the full descriptor of your device to me ...
Modifying USB Audio Speaker Example | Microchip
https://www.microchip.com/forums/m823778.aspx
Hey guys, I'm trying to modify the USB device Audio Speaker example from harmony v1.0. I would like to add another endpoint (IN) and thereby make the connection able to send data to the PC as well. I have changed the descriptor to match this Audio Control Function, with the feature units only s...
Chapter 2 - USBX Device Class Considerations | Microsoft …
https://docs.microsoft.com/en-us/azure/rtos/usbx/usbx-device-stack-supplemental-2
USB Device Audio Class. The USB device Audio class allows for a USB host system to communicate with the device as an audio device. This class is based on the USB standard and USB Audio Class 1.0 or 2.0 standard. A USB …
embedded - USB Audio Descriptor - Stack Overflow
https://stackoverflow.com/questions/23519753/usb-audio-descriptor
I'm trying to implement a PIC32 MCU as a Audio device, using USB audio class 1. I have implementet this project: PIC32 USB Digital Audio Accesory Board Demos.zip and it works fine, but now i want to cut away some of the Audio Control Interface, so i'm having a more simple Audio function: The device seems to get enumerated properly acording to the status LED's on …
Linux device driver to send AND receive audio over USB ...
https://stackoverflow.com/questions/27261244/linux-device-driver-to-send-and-receive-audio-over-usb
I understand there are 2 protocols to send audio over USB - USB Audio Class 1 and 2 (UAC1 & UAC... Stack Overflow. About; Products ... 0x02 wChannelConfig: 0x0003 iChannelNames: 0x00 iTerminal: 0x00 Audio Control Feature Unit Descriptor: bLength: 0x0A bDescriptorType: 0x24 bDescriptorSubtype: 0x06 bUnitID: 0x04 bSourceID: 0x03 bControlSize ...
Wireshark Q&A
https://osqa-ask.wireshark.org/questions/60012/does-wireshark224-decode-usb-audio-feature-unit-descriptor-correctly/
Does Wireshark2.2.4 decode USB Audio Feature Unit Descriptor correctly? 0. Hi All, I'm using wShark v2.2.4 on Win10 to capture USB Audio Traffic. However, I find the feature descriptor bmaControls (listed as "Controls" in wShark) value (0x010002) doesn't match the breakdown bitset list of 0x0100, here bControlSize ("ControlSize" in wShark) is ...
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