calling VIDIOC_STREAMON - webcam light blinks!

git-svn-id: svn://anubis/misc/WebcamTracker@122 bd8a9e45-a331-0410-811e-c64571078777

WebcamTracker.cc

@@ -81,6 +81,35 @@ WebcamTracker::WebcamTracker(const char * device)
                 cerr << " (ENOMEM)";
             cerr << endl;
         }
+
+        v4l2_buffer qbuf;
+        qbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+        qbuf.memory = V4L2_MEMORY_MMAP;
+        qbuf.index = 0;
+        ret = ioctl(m_fd, VIDIOC_QBUF, &qbuf);
+        if (ret != 0)
+        {
+            cerr << "VIDIOC_QBUF failed! errno = " << errno;
+            if (errno == EAGAIN)
+                cerr << " (EAGAIN)";
+            if (errno == EINVAL)
+                cerr << " (EINVAL)";
+            if (errno == ENOMEM)
+                cerr << " (ENOMEM)";
+            if (errno == EIO)
+                cerr << " (EIO)";
+            cerr << endl;
+        }
+
+        int type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+        ret = ioctl(m_fd, VIDIOC_STREAMON, &type);
+        if (ret != 0)
+        {
+            cerr << "VIDIOC_STREAMON ioctl failed! errno = " << errno;
+            if (errno == EINVAL)
+                cerr << " (EINVAL)";
+            cerr << endl;
+        }
     }
     else
     {