josh/WebcamTracker
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checking if buffer filled and dequeuing, blocking forever with only 1 queued

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git-svn-id: svn://anubis/misc/WebcamTracker@123 bd8a9e45-a331-0410-811e-c64571078777
This commit is contained in:
josh 2009-08-07 23:43:22 +00:00
parent 5fa97bb196
commit 5a72b568b9
1 changed files with 36 additions and 0 deletions
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36
WebcamTracker.cc
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@ -110,6 +110,42 @@ WebcamTracker::WebcamTracker(const char * device)
cerr << " (EINVAL)";
cerr << endl;
}
struct v4l2_buffer querybuf;
querybuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
querybuf.index = 0;
ret = ioctl(m_fd, VIDIOC_QUERYBUF, &querybuf);
if (ret != 0)
{
cerr << "VIDIOC_QUERYBUF ioctl failed: returned " << ret
<< ", errno: " << errno;
if (errno == EINVAL)
cerr << " (EINVAL)";
cerr << endl;
}
if (querybuf.flags & V4L2_BUF_FLAG_DONE)
{
cout << "buf done" << endl;
}
v4l2_buffer dqbuf;
dqbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
dqbuf.memory = V4L2_MEMORY_MMAP;
ret = ioctl(m_fd, VIDIOC_DQBUF, &dqbuf);
if (ret != 0)
{
cerr << "VIDIOC_DQBUF 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;
}
}
else
{