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AN295: USB Audio Class Tutorial - Silicon Labs
https://www.silabs.com/documents/public/application-notes/AN295.pdf
Feature Unit Audio Class Descriptor Lists controls (volume, muting, etc.) associated with the above terminal. Output Terminal Audio Class Descriptor Describes the audio data traveling out of the device and into the host. Audio Stream Interface Descriptor Describes the audio stream that uses an isochronous endpoint to transfer the audio.
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 …
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 ...
Wireshark Q&A
https://osqa-ask.wireshark.org/questions/60012/does-wireshark224-decode-usb-audio-feature-unit-descriptor-correctly/
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 decoded as 2, and NrChannels (in Input Terminal Descriptor) is 2.
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.
USB Audio 2.0 Drivers - Windows drivers | Microsoft Docs
https://docs.microsoft.com/en-us/windows-hardware/drivers/audio/usb-2-0-audio-drivers
An audio function must implement exactly one AudioControl Interface Descriptor (ADC-2 4.7) and one or more AudioStreaming Interface Descriptors (ADC-2 4.9). A function with an audio control interface but no streaming interface is not supported. The driver supports all descriptor types defined in ADC-2, section 4.
Chapter 2 - USBX Device Class Considerations | Microsoft …
https://docs.microsoft.com/en-us/azure/rtos/usbx/usbx-device-stack-supplemental-2
The DFU class is a USB-IF standard class. USBX DFU class is relatively simple. It device descriptor does not require anything but a control endpoint. Most of the time, this class will be embedded into a USB composite device.
How to Use Freescale USB Stack
https://www.nxp.com/docs/en/application-note/AN4665.pdf
Feature Unit is a commonly used multi-channel processing unit that provides the basic manipulation of multiple single-parameter Audio Controls on the incoming logical channels such as mute, volume control, and so on. The Feature Unit Descriptor reports what controls are present for every channel in the Feature Unit and for the ‘master’ channel.
Modifying USB Audio Speaker Example | Microchip
https://www.microchip.com/forums/m823778.aspx
Modifying USB Audio Speaker Example. 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 supporting mute ...
Atmel AT06475: SAM D21 USB - Microchip Technology
https://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-42261-SAM-D21-USB_Application-Note_AT06475.pdf
USBCRM to manage the jitter within the USB specification limit. This feature eliminates the requirement of an external ... through the USB descriptors. The device can conserve power in L1-SLEEP state by entering any of the sleep modes ... asynchronous USB Audio applications to provide an explicit feedback on the isochronous endpoints usage in the
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