Re: libv4l2 and the Hauppauge HVR1600 (cx18 driver) not working well together

[Simon Farnsworth <simon.farnsworth@onelan.com>]

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Hans de Goede wrote:
> Ok,
> 
> That was even easier then I thought it would be. Attached is a patch
> (against libv4l-0.6.1), which implements 1) and 3) from above.
> 
I applied it to a clone of your HG repository, and had to make a minor
change to get it to compile. I've attached the updated patch.

It looks like the read() from the card isn't reading entire frames ata a
time - I'm using a piece of test gear that I have to return in a couple
of hours to send colourbars to it, and I'm seeing bad colour, and the
picture moving across the screen. I'll try and chase this, see whether
there's something obviously wrong.

The repository I went against was http://linuxtv.org/hg/~hgoede/libv4l/
identified as:
$ hg identify
c51a90c0f62f+ tip

-- 
Simon Farnsworth


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diff -r c51a90c0f62f v4l2-apps/libv4l/libv4l2/libv4l2.c
--- a/v4l2-apps/libv4l/libv4l2/libv4l2.c	Tue Sep 01 10:03:27 2009 +0200
+++ b/v4l2-apps/libv4l/libv4l2/libv4l2.c	Thu Sep 03 11:17:05 2009 +0100
@@ -526,10 +526,9 @@
     return -1;
   }
 
-  /* we only add functionality for video capture devices, and we do not
-     handle devices which don't do mmap */
+  /* we only add functionality for video capture devices */
   if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) ||
-      !(cap.capabilities & V4L2_CAP_STREAMING))
+      !(cap.capabilities & (V4L2_CAP_STREAMING|V4L2_CAP_READWRITE)))
     return fd;
 
   /* Get current cam format */
@@ -564,6 +563,8 @@
   devices[index].flags = v4l2_flags;
   if (cap.capabilities & V4L2_CAP_READWRITE)
     devices[index].flags |= V4L2_SUPPORTS_READ;
+  if (!(cap.capabilities & V4L2_CAP_STREAMING))
+    devices[index].flags |= V4L2_USE_READ_FOR_READ;
   if (!strcmp((char *)cap.driver, "uvcvideo"))
     devices[index].flags |= V4L2_IS_UVC;
   devices[index].open_count = 1;
@@ -571,7 +572,7 @@
   devices[index].dest_fmt = fmt;
 
   /* When a user does a try_fmt with the current dest_fmt and the dest_fmt
-     is a supported one we will align the resulution (see try_fmt for why).
+     is a supported one we will align the resolution (see try_fmt for why).
      Do the same here now, so that a try_fmt on the result of a get_fmt done
      immediately after open leaves the fmt unchanged. */
   if (v4lconvert_supported_dst_format(