I am aiming to make an ESP32-S3: Appear as a USB Audio Class Device when plugged into a host PC Receive digital audio (PCM) from the host. Decode the audio and play it into a DAC/amp An alternative plan I have looked at would be: 1. USB Audio Class Support use the TinyUSB stack, which is supported in ESP-IDF and Arduino-ESP32 Implement a UAC1 or UAC2 sink device (only needs to receive audio). 2. Audio Streaming Interface The host sends PCM frames (typically 16-bit, stereo, 44.1kHz or 48kHz) over isochronous USB endpoints. define a USB descriptor that tells the host that the device supports audio streaming at certain formats. 3. Audio Output Path Streamed audio is written to a DMA-capable I2S buffer, which outputs to a DAC to the headphone amp Has anyone implemented the UAC2 or UAC1? Something like [UAC 2.0 ](https://docs.espressif.com/projects/esp-iot-solution/en/latest/usb/usb_overview/usb_device_solutions.html#usb-audio-device-solution)

I have played with I2S and managed to play audio through it. Spottune.com also uses I2S (iirc). afaik nobody has yet used USB together with Toit. Until it is exposed through primitives, bundling a C library could indeed be a good solution. Have a look at https://docs.toit.io/tutorials/misc/c-service to see how Toit can communicate with C. The biggest downside of this approach is that you need to build your own envelope (and maintain it). My suggestion, if you are for it: try to get things working with tiny-usb as an external library, and if the API surface isn't too big, we can then try to integrate tiny-usb through primitives, making it a first-class citizen.

@MichaelK https://discord.com/channels/918498540232253480/918498540232253483/1401859279958573106 I saw you asked a similar question to this one here in the #918498540232253483 channel

I was asked to write a post in #1025033592688087120

yeah, check out where this thread is?