lib uvc - isochronous mode transfer doesnt seem correct, causes callback to client on each partial frame packet (IEC-34)

[sxrap1]

Answers checklist.

• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

General issue report

I can connect to USB UVC Camera, ans start streaming,
Frame Callback has packet lengths around the 1 to 2K bytes length, should be closer to 61K bytes
I can see the bytes coming in, in stream.c _uvc_stream_callback, however this code looks wrong to build up the full packet, hence the callback getting scrambled data.

[leeebo]

@sxrap1 If you only need the UVC/UAC function in your USB Host project/product, try the usb_stream also. Which is based on a lower-level HCD driver, incompatible with other ESP-IDF USB host drivers, but easier to use and debug.