isochronous transfer for UVC camera

[SAITOU Toshihide]

In message: <201210291436.08940.hselasky at c2i.net>
            Hans Petter Selasky <hselasky at c2i.net> writes:
> On Monday 29 October 2012 13:54:34 SAITOU Toshihide wrote:
>> #define PKT_LEN        0x1400
> 
> The packet length is not this value I think.
> 
> The 0x1000 is part of the packet multiplier for High-Speed USB's 
> wMaxPacketSize.
> 
> It is (1+2) * 0x400. Try that and see what happens.

Thank you for your quick response.

I can't use the FreeBSD now so I will try this tomorrow.  But Mac OS X 10.6.8 with libus 1.0.9, callback is not invoked too with some combination of the value below:

#define PKT_LEN        0x400
#define PKTS_PER_XFER  8

$ ./ex10
libusb: 0.000000 info [darwin_open] device open for access
libusb: 0.285678 info [darwin_async_io_callback] an async io operation has completed
libusb: 0.286030 info [op_handle_events] checking fd 4 with revents = 0
libusb: 0.286187 info [op_handle_events] checking fd 6 with revents = 1
libusb: 0.286343 info [darwin_handle_callback] handling control completion with kernel status 0
1 0 1 1 40 4b 4c 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
libusb: 0.287708 info [darwin_async_io_callback] an async io operation has completed
libusb: 0.287751 info [op_handle_events] checking fd 4 with revents = 0
libusb: 0.287761 info [op_handle_events] checking fd 6 with revents = 1
libusb: 0.287775 info [darwin_handle_callback] handling control completion with kernel status 0
1 0 1 1 d0 12 13 0 0 0 0 0 0 0 0 0 0 0 0 60 9 0 0 c 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
libusb: 0.288714 info [darwin_async_io_callback] an async io operation has completed
libusb: 0.288770 info [op_handle_events] checking fd 4 with revents = 0
libusb: 0.288781 info [op_handle_events] checking fd 6 with revents = 1
libusb: 0.288799 info [darwin_handle_callback] handling control completion with kernel status 0
1 0 1 1 d0 12 13 0 0 0 0 0 0 0 0 0 0 0 0 60 9 0 0 c 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
libusb: 0.289960 info [get_endpoints] building table of endpoints.
libusb: 0.290151 info [darwin_claim_interface] interface opened
libusb: 0.292436 info [get_endpoints] building table of endpoints.
libusb: 0.292459 info [get_endpoints] interface: 1 pipe 1: dir: 1 number: 2
libusb: 0.292478 info [ep_to_pipeRef] converting ep address 0x82 to pipeRef and interface
libusb: 0.292484 info [ep_to_pipeRef] pipe 1 on interface 1 matches
libusb: 0.297929 info [darwin_async_io_callback] an async io operation has completed
libusb: 30.289159 error [do_close] Device handle closed while transfer was still being processed, but the device is still connected as far as we know
libusb: 30.289196 error [do_close] A cancellation hasn't even been scheduled on the transfer for which the device is closing
libusb: 30.290970 info [event_thread_main] thread exiting

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SAITOU Toshihide