Re: [Libusb-win32-devel] libusbK: Isochronous OUT

[nikkov <ni...@gm...>]

>From: Travis
>http://libusb-win32.sourceforge.net/libusbKv3/struct_k_i_s_o___p_a_c_k_e_t.html
>Length
>  Set by the host controller to indicate the actual number of bytes
>  received by the device for isochronous IN transfers. Length not used for
>  isochronous OUT transfers.
>
>;)
 Yes it is :-) . But I checked also transfer by sniffer and all the same data length=0

>libusbK.sys will manage the start frame by default,  but there is a pipe 
>policy to force the ASAP flag.
>http://libusb-win32.sourceforge.net/libusbKv3/usbk_pipe_management.html
>I need to update my docs but they only thing they do say is it should 
>default to use ASAP for OUT (by default) and the start frame for (IN).
>
>Set the ISO_ALWAYS_START_ASAP pipe policy and see if that helps. ..or 
>maybe clear it.. ;)
>
>Regards,
>Travis

I set pipe policy ISO_ALWAYS_START_ASAP and get ISO_ALWAYS_START_ASAP and StartFrame=0 in all packets.
Data to device is still not passed.

>From: Xiaofan Chen
>Just curious, why not use the Windows audio related API? What
>do you gain by using libusbK?
>
>-- 
>Xiaofan

It's only for learning. In future I plan to work with custom high speed USB audio device

Best regards.
Nikolay