[Libusb-devel] isochronous - usb_isochronous_submit - help

[Mounir W. <mou...@ya...>]

Hi, I am fairly new to libusb and I am having problems
with Mac Cody's isochronous code. I am using a patched
version of libusb-0.1.10a, which contains the
isochronous code written by Mac Cody.

I am trying to capture video data from the isochronous
endpoint of my tv/pvr device. After device setup, I
create a usb_urb and call usb_isochronous_setup to
initialize it. Everything works fine until I call
usb_isochronous_submit on that usb_urb. I noticed that
the IOCTL_USB_SUBMITURB ioctl returns -1 (Invalid
argument). A short version of the code is listed
below. Would anyone be able to help me figure out this
problem? Has anyone been successful at using Mac
Cody's isochronous code? I am running Gentoo Linux on
a x86_64 machine. I'm not sure if the architecture is
the problem here, because I tried to run my code on a
x86 machine and I got the same results. Any help would
be much appreciated. Thank you.

--------------------- code begins
---------------------

// ...

struct usb_urb* iso_urb = NULL;
struct timeval tval;
int iso_ret;

// ...

iso_ret = usb_isochronous_setup(&iso_urb, 0x82, 2580,
buffer, 12 * 2580);

printf("EP: 0x%X\n", iso_urb->endpoint);
printf("Buffer length: %d\n", iso_urb->buffer_length);
printf("Packets: %d\n", iso_urb->number_of_packets);

iso_ret = usb_isochronous_submit(dev_h, iso_urb,
&tval);

// ...

---------------------- code ends ----------------------


	



	
		
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