[Opalvoip-devel] HAS_V4L not set --> libv4l2 not used

[Denis L. <den...@go...>]

Hi Robert, hi mailing list,

I have a problem with using V4L2 with the latest revision of ptlib. The
HAS_V4L macro is not set, therefore the V4L2 headers are not used.

First, I thought it was because I disabled V4L1, but it doesn't help.

The output of configure said:

checking linux/videodev.h usability... yes
checking linux/videodev.h presence... yes
checking for linux/videodev.h... yes
checking for V4L video support... yes
checking for linux/videodev2.h... yes
checking for V4L2 video support... yes
checking libv4l2.h usability... yes
checking libv4l2.h presence... yes
checking for libv4l2.h... yes
checking for v4l2_fd_open in -lv4l2... yes
checking for libv4l2 support... yes

However, I didn't find an entry in ptbuildopts.h

PS:

I had to apply this patch to get vidinput_v4l working:

Index: plugins/vidinput_v4l/vidinput_v4l.cxx
===================================================================
--- plugins/vidinput_v4l/vidinput_v4l.cxx    (Revision 27352)
+++ plugins/vidinput_v4l/vidinput_v4l.cxx    (Arbeitskopie)
@@ -369,7 +369,7 @@
         matches++;
         PStringStream revisedUserName;
         revisedUserName << userName << " (" << matches << ")";
-        tempList.SetDataAt(j, revisedUserName);
+        tempList.SetAt(j, revisedUserName);
       }
     }
   }
@@ -1121,11 +1121,12 @@
     for (int i=0; i<2; i++) {
       if (pendingSync[i]) {
         int res = ::ioctl(videoFd, VIDIOCSYNC, &i);
-        if (res < 0)
+        if (res < 0){
           PTRACE(1,"PVideoInputDevice_V4L::GetFrameData csync failed : "
<< ::strerror(errno));
           pendingSync[i] = PFalse;
         }
         ::munmap(videoBuffer, frame.size);
+      }
     }
   }

Anyway, I think V4L is a bit out-dated, so I don't think it's very useful.