Re: [PATCH 0 of 4] ov534 patches

[Antonio Ospite <ospite@xxxxxxxxxxxxxxxxx>]

On Thu, 4 Dec 2008 12:15:46 -0500
Jim Paris <jim@xxxxxxxx> wrote:

> 
> Antonio Ospite wrote:
> > Tested the latest version, I am getting "payload error"s setting
> > frame_rate=50, loosing about 50% of frames. I tried raising
> > bulk_size but then I get "frame overflow" errors from gspca, I'll
> > investigate further.
> 
> I don't think I see any payload errors even at 50fps.  For the bulk
> size, I'm not sure exactly how the payloads work into that.  I suppose
> that when bulk_size is larger than the camera's payload size (2048),
> we get another payload header at data[2048] but don't pay attention to
> it.  If this header had the EOF then we can send gspca too much data,
> causing frame overflow.  (there's no overflow check in ov534 since
> gspca handles it already).
>
> With the current setup, we're essentially getting a UVC stream.  This
> makes sense since the marketing for ov534 says it supports UVC.  So
> some documentation for this would be
>   http://www.usb.org/developers/devclass_docs/USB_Video_Class_1_1.zip
>

I need to read something more about UVC.

Ah, and from a quick test on PS3 it looks like the header is not added
here, but I haven't had the chance to see what exactly happened.

Hope to post some news soon.

Regards,
   Antonio

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