From 5fa97bb196c5e176e5930037668b85fb8368c314 Mon Sep 17 00:00:00 2001
From: josh <josh@bd8a9e45-a331-0410-811e-c64571078777>
Date: Fri, 7 Aug 2009 23:24:18 +0000
Subject: [PATCH] calling VIDIOC_STREAMON - webcam light blinks!

git-svn-id: svn://anubis/misc/WebcamTracker@122 bd8a9e45-a331-0410-811e-c64571078777
---
 WebcamTracker.cc | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/WebcamTracker.cc b/WebcamTracker.cc
index 3bf1b7b..9890e5e 100644
--- a/WebcamTracker.cc
+++ b/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
     {