Suggestion: usb audio

[mchamsteryt2]

Hi, Just saw the new version of Cardputer (i.e. Cardputer Adv) that automaticlly supports the Audio jack natively and no update on the Audio over USB

Originally posted by @sanchitminda in #1

Is it possible to revisit this and add usb audio support so people can use a usb to 3.5mm converter to allow for stereo audio as built in cardputer adv 3.5mm port is mono audio only and i would like to be able to use a stereo audio output

[mchamsteryt2]

Also some newer songs sound extremely slowed down for some reason (might have something to do with stereo mixing on the built in dac so usb audio implementation will help quite a lot)

[sanchitminda]

Did someone relaease any library for USB Audio. I was not able to find anyhting if you have please let me know

[sanchitminda]

Also please can you please provide the song so i can check what is causing slow down, and can you check if reducing the dac rate helps a bit you can try reducing it to 41K

[mchamsteryt2]

Did someone relaease any library for USB Audio. I was not able to find anyhting if you have please let me know

https://github.com/esp-arduino-libs/ESP32_USB_Stream
https://github.com/espressif/esp-iot-solution/tree/dc88ac67/examples/usb/host/usb_audio_player
https://docs.espressif.com/projects/esp-iot-solution/en/latest/usb/usb_host/usb_stream.html

[sanchitminda]

Thanks a bunch

[mchamsteryt2]

Also please can you please provide the song so i can check what is causing slow down, and can you check if reducing the dac rate helps a bit you can try reducing it to 41K

Mostly paint it black by the rolling stones but also a few other newer or older songs with stereo mixing

[sanchitminda]

So is that 320kbps mp3 or 900kbps flac?

[mchamsteryt2]

So is that 320kbps mp3 or 900kbps flac?

Flac but all my files are flac and the ones i seem to have the issue with are stereo mixed songs

[sanchitminda]

Can you share any sample file on my email sanchitminda@gmail.com. I have tried but all seems perfectly fine with the songs i tried.

[mchamsteryt2]

Can you share any sample file on my email sanchitminda@gmail.com. I have tried but all seems perfectly fine with the songs i tried.

Sent you one of the songs

[sanchitminda]

Yup, That sounds terrible, let me investigate, I am assuming that I need to add buffer for flac. currently I am playing it directly from SD card to save RAM, let me try if that works

[mchamsteryt2]

Yup, That sounds terrible, let me investigate, I am assuming that I need to add buffer for flac. currently I am playing it directly from SD card to save RAM, let me try if that works

Any luck?

[sanchitminda]

Need to research a bit. With only 320kb of ram it's very difficult to alot much buffer. But I'll try to come up with work around. Let me try me best and see what can I come up with.

[mchamsteryt2]

Need to research a bit. With only 320kb of ram it's very difficult to alot much buffer. But I'll try to come up with work around. Let me try me best and see what can I come up with.

Alrighty and also guessing eventually you might consider adding usb audio?

[sanchitminda]

Yess that's something seems possible