Some experimental V4L code...

7 files changed, 901 insertions, 3 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index 4804101..7f62c50 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,16 +1,20 @@
 bin_PROGRAMS = simplertp
 
-simplertp_LDADD = $(QT_LIBS) $(AO_LIBS) \
+simplertp_LDADD = $(QT_LIBS) $(AO_LIBS) $(V4LC_LIBS) \
 	$(shell ../tools/MocList o ) qrc_simplertp.o 
 
-simplertp_CXXFLAGS = $(QT_CFLAGS) $(AO_CFLAGS)
+simplertp_CXXFLAGS = $(QT_CFLAGS) $(AO_CFLAGS) $(V4LC_CFLAGS)
 AM_CXXFLAGS = $(QT_CFLAGS)
 
 simplertp_SOURCES = \
-	simplertp.cc
+	simplertp.cc \
+	mainwindow.cc \
+	v4l.cc
 
 EXTRA_DIST = \
 	simplertp.qrc
+	mainwindow.h \
+	v4l.h
 
 simplertp_MOC = $(shell ../tools/MocList cc )
 
diff --git a/src/mainwindow.cc b/src/mainwindow.cc
new file mode 100644
index 0000000..a0a2986
--- /dev/null
+++ b/src/mainwindow.cc
@@ -0,0 +1,53 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            mainwindow.cc
+ *
+ *  Thu Sep 18 19:30:14 CEST 2014
+ *  Copyright 2014 Bent Bisballe Nyeng
+ *  deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ *  This file is part of SimpleRTP.
+ *
+ *  SimpleRTP is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  SimpleRTP is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with SimpleRTP; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#include "mainwindow.h"
+
+#include <QLabel>
+#include <stdio.h>
+
+MainWindow::MainWindow()
+{
+  connect(&v4l, SIGNAL(newImage(QImage)), this, SLOT(newImage(QImage)));
+  setCentralWidget(new QLabel());
+}
+
+void MainWindow::newImage(QImage img)
+{
+  if(img.isNull()) {
+    printf("Invalid image\n");
+    return;
+  }
+
+  printf("img->w: %d\n", img.width());
+  printf("img->h: %d\n", img.height());
+
+  QLabel *l = (QLabel*)centralWidget();
+  QPixmap p;
+  p.convertFromImage(img);
+  l->setPixmap(p);
+  printf("Got one\n");
+}
diff --git a/src/mainwindow.h b/src/mainwindow.h
new file mode 100644
index 0000000..419c302
--- /dev/null
+++ b/src/mainwindow.h
@@ -0,0 +1,46 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            mainwindow.h
+ *
+ *  Thu Sep 18 19:30:14 CEST 2014
+ *  Copyright 2014 Bent Bisballe Nyeng
+ *  deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ *  This file is part of SimpleRTP.
+ *
+ *  SimpleRTP is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  SimpleRTP is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with SimpleRTP; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#ifndef __SIMPLERTP_MAINWINDOW_H__
+#define __SIMPLERTP_MAINWINDOW_H__
+
+#include <QMainWindow>
+
+#include "v4l.h"
+
+class MainWindow : public QMainWindow {
+Q_OBJECT
+public:
+  MainWindow();
+
+public slots:
+  void newImage(QImage img);
+
+private:
+  V4L v4l;
+};
+
+#endif/*__SIMPLERTP_MAINWINDOW_H__*/
diff --git a/src/simplertp.cc b/src/simplertp.cc
index 7d61579..6cff1ff 100644
--- a/src/simplertp.cc
+++ b/src/simplertp.cc
@@ -24,5 +24,16 @@
  *  along with SimpleRTP; if not, write to the Free Software
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
  */
+#include <QApplication>
 
+#include "mainwindow.h"
 
+int main(int argc, char *argv[])
+{
+  QApplication app(argc, argv);
+
+  MainWindow wnd;
+  wnd.show();
+
+  return app.exec();
+}
diff --git a/src/simplertp.qrc b/src/simplertp.qrc
index ca52ef2..7cdbd41 100644
--- a/src/simplertp.qrc
+++ b/src/simplertp.qrc
@@ -1,5 +1,6 @@
 <!DOCTYPE RCC>
 <RCC version="1.0">
 <qresource>
+    <file>../icons/simple.png</file>
 </qresource>
 </RCC>
diff --git a/src/v4l.cc b/src/v4l.cc
new file mode 100644
index 0000000..c76ace2
--- /dev/null
+++ b/src/v4l.cc
@@ -0,0 +1,736 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            v4l.cc
+ *
+ *  Thu Sep 18 19:36:19 CEST 2014
+ *  Copyright 2014 Bent Bisballe Nyeng
+ *  deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ *  This file is part of SimpleRTP.
+ *
+ *  SimpleRTP is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  SimpleRTP is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with SimpleRTP; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#include "v4l.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#include <getopt.h>             /* getopt_long() */
+
+#include <fcntl.h>              /* low-level i/o */
+#include <unistd.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/mman.h>
+#include <sys/ioctl.h>
+
+#include <linux/videodev2.h>
+#include <libv4lconvert.h>
+
+static V4L *v4l = NULL;
+
+#define CLEAR(x) memset(&(x), 0, sizeof(x))
+
+enum io_method {
+  IO_METHOD_READ,
+  IO_METHOD_MMAP,
+  IO_METHOD_USERPTR,
+};
+
+struct buffer {
+  void   *start;
+  size_t  length;
+};
+
+static const char            *dev_name;
+static enum io_method   io = IO_METHOD_MMAP;
+static int              fd = -1;
+struct buffer          *buffers;
+static unsigned int     n_buffers;
+static int              out_buf;
+static int              force_format;
+static int              frame_count = 70;
+
+static void errno_exit(const char *s)
+{
+  fprintf(stderr, "%s error %d, %s\n", s, errno, strerror(errno));
+  exit(EXIT_FAILURE);
+}
+
+static int xioctl(int fh, int request, void *arg)
+{
+  int r;
+
+  do {
+    r = ioctl(fh, request, arg);
+  } while (-1 == r && EINTR == errno);
+
+  return r;
+}
+
+static void process_image(const void *p, int size)
+{
+  if(v4l) v4l->processImage(p, size);
+  /*
+  if (out_buf)
+    fwrite(p, size, 1, stdout);
+
+  fflush(stderr);
+  fprintf(stderr, "[%d]", size);
+  fflush(stdout);
+
+  FILE *fp = fopen("out.data", "w");
+  fwrite(p, size, 1, fp);
+  fclose(fp);
+  exit(0);
+  */
+}
+
+static int read_frame(void)
+{
+  struct v4l2_buffer buf;
+  unsigned int i;
+
+  switch (io) {
+  case IO_METHOD_READ:
+    if (-1 == read(fd, buffers[0].start, buffers[0].length)) {
+      switch (errno) {
+      case EAGAIN:
+        return 0;
+
+      case EIO:
+        /* Could ignore EIO, see spec. */
+
+        /* fall through */
+
+      default:
+        errno_exit("read");
+      }
+    }
+
+    process_image(buffers[0].start, buffers[0].length);
+    break;
+
+  case IO_METHOD_MMAP:
+    CLEAR(buf);
+
+    buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+    buf.memory = V4L2_MEMORY_MMAP;
+
+    if (-1 == xioctl(fd, VIDIOC_DQBUF, &buf)) {
+      switch (errno) {
+      case EAGAIN:
+        return 0;
+
+      case EIO:
+        /* Could ignore EIO, see spec. */
+
+        /* fall through */
+
+      default:
+        errno_exit("VIDIOC_DQBUF");
+      }
+    }
+
+    assert(buf.index < n_buffers);
+
+    process_image(buffers[buf.index].start, buf.bytesused);
+
+    if (-1 == xioctl(fd, VIDIOC_QBUF, &buf))
+      errno_exit("VIDIOC_QBUF");
+    break;
+
+  case IO_METHOD_USERPTR:
+    CLEAR(buf);
+
+    buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+    buf.memory = V4L2_MEMORY_USERPTR;
+
+    if (-1 == xioctl(fd, VIDIOC_DQBUF, &buf)) {
+      switch (errno) {
+      case EAGAIN:
+        return 0;
+
+      case EIO:
+        /* Could ignore EIO, see spec. */
+
+        /* fall through */
+
+      default:
+        errno_exit("VIDIOC_DQBUF");
+      }
+    }
+
+    for (i = 0; i < n_buffers; ++i)
+      if (buf.m.userptr == (unsigned long)buffers[i].start
+          && buf.length == buffers[i].length)
+        break;
+
+    assert(i < n_buffers);
+
+    process_image((void *)buf.m.userptr, buf.bytesused);
+
+    if (-1 == xioctl(fd, VIDIOC_QBUF, &buf))
+      errno_exit("VIDIOC_QBUF");
+    break;
+  }
+
+  return 1;
+}
+static bool running = true;
+static void mainloop(void)
+{
+  unsigned int count;
+
+  count = frame_count;
+
+  while(running) {
+    for (;;) {
+      fd_set fds;
+      struct timeval tv;
+      int r;
+
+      FD_ZERO(&fds);
+      FD_SET(fd, &fds);
+
+      /* Timeout. */
+      tv.tv_sec = 2;
+      tv.tv_usec = 0;
+
+      r = select(fd + 1, &fds, NULL, NULL, &tv);
+
+      if (-1 == r) {
+        if (EINTR == errno)
+          continue;
+        errno_exit("select");
+      }
+
+      if (0 == r) {
+        fprintf(stderr, "select timeout\n");
+        exit(EXIT_FAILURE);
+      }
+
+      if (read_frame())
+        break;
+      /* EAGAIN - continue select loop. */
+    }
+  }
+}
+
+static void stop_capturing(void)
+{
+  enum v4l2_buf_type type;
+
+  switch (io) {
+  case IO_METHOD_READ:
+    /* Nothing to do. */
+    break;
+
+  case IO_METHOD_MMAP:
+  case IO_METHOD_USERPTR:
+    type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+    if (-1 == xioctl(fd, VIDIOC_STREAMOFF, &type))
+      errno_exit("VIDIOC_STREAMOFF");
+    break;
+  }
+}
+
+static void start_capturing(void)
+{
+  unsigned int i;
+  enum v4l2_buf_type type;
+
+  switch (io) {
+  case IO_METHOD_READ:
+    /* Nothing to do. */
+    break;
+
+  case IO_METHOD_MMAP:
+    for (i = 0; i < n_buffers; ++i) {
+      struct v4l2_buffer buf;
+
+      CLEAR(buf);
+      buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+      buf.memory = V4L2_MEMORY_MMAP;
+      buf.index = i;
+
+      if (-1 == xioctl(fd, VIDIOC_QBUF, &buf))
+        errno_exit("VIDIOC_QBUF");
+    }
+    type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+    if (-1 == xioctl(fd, VIDIOC_STREAMON, &type))
+      errno_exit("VIDIOC_STREAMON");
+    break;
+
+  case IO_METHOD_USERPTR:
+    for (i = 0; i < n_buffers; ++i) {
+      struct v4l2_buffer buf;
+
+      CLEAR(buf);
+      buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+      buf.memory = V4L2_MEMORY_USERPTR;
+      buf.index = i;
+      buf.m.userptr = (unsigned long)buffers[i].start;
+      buf.length = buffers[i].length;
+
+      if (-1 == xioctl(fd, VIDIOC_QBUF, &buf))
+        errno_exit("VIDIOC_QBUF");
+    }
+    type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+    if (-1 == xioctl(fd, VIDIOC_STREAMON, &type))
+      errno_exit("VIDIOC_STREAMON");
+    break;
+  }
+}
+
+static void uninit_device(void)
+{
+  unsigned int i;
+
+  switch (io) {
+  case IO_METHOD_READ:
+    free(buffers[0].start);
+    break;
+
+  case IO_METHOD_MMAP:
+    for (i = 0; i < n_buffers; ++i)
+      if (-1 == munmap(buffers[i].start, buffers[i].length))
+        errno_exit("munmap");
+    break;
+
+  case IO_METHOD_USERPTR:
+    for (i = 0; i < n_buffers; ++i)
+      free(buffers[i].start);
+    break;
+  }
+
+  free(buffers);
+}
+
+static void init_read(unsigned int buffer_size)
+{
+	buffers = (buffer*)calloc(1, sizeof(*buffers));
+
+  if (!buffers) {
+    fprintf(stderr, "Out of memory\n");
+    exit(EXIT_FAILURE);
+  }
+
+  buffers[0].length = buffer_size;
+  buffers[0].start = malloc(buffer_size);
+
+  if (!buffers[0].start) {
+    fprintf(stderr, "Out of memory\n");
+    exit(EXIT_FAILURE);
+  }
+}
+
+static void init_mmap(void)
+{
+  struct v4l2_requestbuffers req;
+
+  CLEAR(req);
+
+  req.count = 4;
+  req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+  req.memory = V4L2_MEMORY_MMAP;
+
+  if (-1 == xioctl(fd, VIDIOC_REQBUFS, &req)) {
+    if (EINVAL == errno) {
+      fprintf(stderr, "%s does not support "
+              "memory mapping\n", dev_name);
+      exit(EXIT_FAILURE);
+    } else {
+      errno_exit("VIDIOC_REQBUFS");
+    }
+  }
+
+  if (req.count < 2) {
+    fprintf(stderr, "Insufficient buffer memory on %s\n",
+            dev_name);
+    exit(EXIT_FAILURE);
+  }
+
+  buffers = (buffer*)calloc(req.count, sizeof(*buffers));
+
+  if (!buffers) {
+    fprintf(stderr, "Out of memory\n");
+    exit(EXIT_FAILURE);
+  }
+
+  for (n_buffers = 0; n_buffers < req.count; ++n_buffers) {
+    struct v4l2_buffer buf;
+
+    CLEAR(buf);
+
+    buf.type        = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+    buf.memory      = V4L2_MEMORY_MMAP;
+    buf.index       = n_buffers;
+
+    if (-1 == xioctl(fd, VIDIOC_QUERYBUF, &buf))
+      errno_exit("VIDIOC_QUERYBUF");
+
+    buffers[n_buffers].length = buf.length;
+    buffers[n_buffers].start =
+      mmap(NULL /* start anywhere */,
+           buf.length,
+           PROT_READ | PROT_WRITE /* required */,
+           MAP_SHARED /* recommended */,
+           fd, buf.m.offset);
+
+    if (MAP_FAILED == buffers[n_buffers].start)
+      errno_exit("mmap");
+  }
+}
+
+static void init_userp(unsigned int buffer_size)
+{
+  struct v4l2_requestbuffers req;
+
+  CLEAR(req);
+
+  req.count  = 4;
+  req.type   = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+  req.memory = V4L2_MEMORY_USERPTR;
+
+  if (-1 == xioctl(fd, VIDIOC_REQBUFS, &req)) {
+    if (EINVAL == errno) {
+      fprintf(stderr, "%s does not support "
+              "user pointer i/o\n", dev_name);
+      exit(EXIT_FAILURE);
+    } else {
+      errno_exit("VIDIOC_REQBUFS");
+    }
+  }
+
+  buffers = (buffer*)calloc(4, sizeof(*buffers));
+
+  if (!buffers) {
+    fprintf(stderr, "Out of memory\n");
+    exit(EXIT_FAILURE);
+  }
+
+  for (n_buffers = 0; n_buffers < 4; ++n_buffers) {
+    buffers[n_buffers].length = buffer_size;
+    buffers[n_buffers].start = malloc(buffer_size);
+
+    if (!buffers[n_buffers].start) {
+      fprintf(stderr, "Out of memory\n");
+      exit(EXIT_FAILURE);
+    }
+  }
+}
+
+static void init_device(void)
+{
+  struct v4l2_capability cap;
+  struct v4l2_cropcap cropcap;
+  struct v4l2_crop crop;
+  struct v4l2_format fmt;
+  unsigned int min;
+
+  if (-1 == xioctl(fd, VIDIOC_QUERYCAP, &cap)) {
+    if (EINVAL == errno) {
+      fprintf(stderr, "%s is no V4L2 device\n",
+              dev_name);
+      exit(EXIT_FAILURE);
+    } else {
+      errno_exit("VIDIOC_QUERYCAP");
+    }
+  }
+
+  if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
+    fprintf(stderr, "%s is no video capture device\n",
+            dev_name);
+    exit(EXIT_FAILURE);
+  }
+  
+  switch (io) {
+  case IO_METHOD_READ:
+    if (!(cap.capabilities & V4L2_CAP_READWRITE)) {
+      fprintf(stderr, "%s does not support read i/o\n",
+              dev_name);
+      exit(EXIT_FAILURE);
+    }
+    break;
+    
+  case IO_METHOD_MMAP:
+  case IO_METHOD_USERPTR:
+    if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
+      fprintf(stderr, "%s does not support streaming i/o\n",
+              dev_name);
+      exit(EXIT_FAILURE);
+    }
+    break;
+  }
+  
+  
+  /* Select video input, video standard and tune here. */
+  
+  
+  CLEAR(cropcap);
+  
+  cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+  
+  if (0 == xioctl(fd, VIDIOC_CROPCAP, &cropcap)) {
+    crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+    crop.c = cropcap.defrect; /* reset to default */
+    
+    if (-1 == xioctl(fd, VIDIOC_S_CROP, &crop)) {
+      switch (errno) {
+      case EINVAL:
+        /* Cropping not supported. */
+        break;
+      default:
+        /* Errors ignored. */
+        break;
+      }
+    }
+  } else {
+    /* Errors ignored. */
+  }
+  
+
+  CLEAR(fmt);
+
+  fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+  if (true || force_format) {
+    fmt.fmt.pix.width       = 640;
+    fmt.fmt.pix.height      = 480;
+    fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_RGB32;
+    //    fmt.fmt.pix.field       = V4L2_FIELD_NONE;
+
+    if (-1 == xioctl(fd, VIDIOC_S_FMT, &fmt))
+      errno_exit("VIDIOC_S_FMT");
+
+    printf("w: %d\n", fmt.fmt.pix.width);
+    printf("h: %d\n", fmt.fmt.pix.height);
+    char *p = (char*)&fmt.fmt.pix.pixelformat;
+    printf("f: %c\n", p[0]);
+    printf("f: %c\n", p[1]);
+    printf("f: %c\n", p[2]);
+    printf("f: %c\n", p[3]);
+
+    /* Note VIDIOC_S_FMT may change width and height. */
+  } else {
+    /* Preserve original settings as set by v4l2-ctl for example */
+    if (-1 == xioctl(fd, VIDIOC_G_FMT, &fmt))
+      errno_exit("VIDIOC_G_FMT");
+  }
+  
+  /* Buggy driver paranoia. */
+  min = fmt.fmt.pix.width * 2;
+  if (fmt.fmt.pix.bytesperline < min)
+    fmt.fmt.pix.bytesperline = min;
+  min = fmt.fmt.pix.bytesperline * fmt.fmt.pix.height;
+  if (fmt.fmt.pix.sizeimage < min)
+    fmt.fmt.pix.sizeimage = min;
+  
+  switch (io) {
+  case IO_METHOD_READ:
+    init_read(fmt.fmt.pix.sizeimage);
+    break;
+    
+  case IO_METHOD_MMAP:
+    init_mmap();
+    break;
+    
+  case IO_METHOD_USERPTR:
+    init_userp(fmt.fmt.pix.sizeimage);
+    break;
+  }
+}
+
+static void close_device(void)
+{
+  if (-1 == close(fd))
+    errno_exit("close");
+  
+  fd = -1;
+}
+
+static void open_device(void)
+{
+  struct stat st;
+
+  if (-1 == stat(dev_name, &st)) {
+    fprintf(stderr, "Cannot identify '%s': %d, %s\n",
+            dev_name, errno, strerror(errno));
+    exit(EXIT_FAILURE);
+  }
+
+  if (!S_ISCHR(st.st_mode)) {
+    fprintf(stderr, "%s is no device\n", dev_name);
+    exit(EXIT_FAILURE);
+  }
+
+  fd = open(dev_name, O_RDWR /* required */ | O_NONBLOCK, 0);
+
+  if (-1 == fd) {
+    fprintf(stderr, "Cannot open '%s': %d, %s\n",
+            dev_name, errno, strerror(errno));
+    exit(EXIT_FAILURE);
+  }
+}
+
+#if 0
+static void usage(FILE *fp, int argc, char **argv)
+{
+  fprintf(fp,
+          "Usage: %s [options]\n\n"
+          "Version 1.3\n"
+          "Options:\n"
+          "-d | --device name   Video device name [%s]\n"
+          "-h | --help          Print this message\n"
+          "-m | --mmap          Use memory mapped buffers [default]\n"
+          "-r | --read          Use read() calls\n"
+          "-u | --userp         Use application allocated buffers\n"
+          "-o | --output        Outputs stream to stdout\n"
+          "-f | --format        Force format to 640x480 YUYV\n"
+          "-c | --count         Number of frames to grab [%i]\n"
+          "",
+          argv[0], dev_name, frame_count);
+}
+
+static const char short_options[] = "d:hmruofc:";
+
+static const struct option
+long_options[] = {
+  { "device", required_argument, NULL, 'd' },
+  { "help",   no_argument,       NULL, 'h' },
+  { "mmap",   no_argument,       NULL, 'm' },
+  { "read",   no_argument,       NULL, 'r' },
+  { "userp",  no_argument,       NULL, 'u' },
+  { "output", no_argument,       NULL, 'o' },
+  { "format", no_argument,       NULL, 'f' },
+  { "count",  required_argument, NULL, 'c' },
+  { 0, 0, 0, 0 }
+};
+
+int main(int argc, char **argv)
+{
+  dev_name = "/dev/video0";
+
+  for (;;) {
+    int idx;
+    int c;
+
+    c = getopt_long(argc, argv,
+                    short_options, long_options, &idx);
+
+    if (-1 == c)
+      break;
+
+    switch (c) {
+    case 0: /* getopt_long() flag */
+      break;
+
+    case 'd':
+      dev_name = optarg;
+      break;
+
+    case 'h':
+      usage(stdout, argc, argv);
+      exit(EXIT_SUCCESS);
+
+    case 'm':
+      io = IO_METHOD_MMAP;
+      break;
+
+    case 'r':
+      io = IO_METHOD_READ;
+      break;
+
+    case 'u':
+      io = IO_METHOD_USERPTR;
+      break;
+
+    case 'o':
+      out_buf++;
+      break;
+
+    case 'f':
+      force_format++;
+      break;
+
+    case 'c':
+      errno = 0;
+      frame_count = strtol(optarg, NULL, 0);
+      if (errno)
+        errno_exit(optarg);
+      break;
+
+    default:
+      usage(stderr, argc, argv);
+      exit(EXIT_FAILURE);
+    }
+  }
+
+  open_device();
+  init_device();
+  start_capturing();
+  mainloop();
+  stop_capturing();
+  uninit_device();
+  close_device();
+  fprintf(stderr, "\n");
+  return 0;
+}
+#endif/*0*/
+
+V4L::V4L()
+{
+  v4l = this; // Set global V4L object pointer.
+  start();
+}
+
+V4L::~V4L()
+{
+  v4l = NULL; // Unset global V4L object pointer.
+  
+  // TODO: Stop thread.... somehow.
+}
+
+void V4L::run()
+{
+  dev_name = "/dev/video0";
+  force_format = true;
+
+  open_device();
+  init_device();
+  start_capturing();
+  mainloop();
+  stop_capturing();
+  uninit_device();
+  close_device();
+}
+
+
+void V4L::processImage(const void *p, int size)
+{
+  int width = 640;
+  int height = 480;
+  printf("processImage(%d, should be %d)\n", size, width * height * 4);
+  uchar *i = (uchar *)malloc(size);
+  memcpy(i, p, size);
+  QImage img(i, width, height, QImage::Format_RGB32);
+  emit newImage(img);
+}
diff --git a/src/v4l.h b/src/v4l.h
new file mode 100644
index 0000000..877843c
--- /dev/null
+++ b/src/v4l.h
@@ -0,0 +1,47 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            v4l.h
+ *
+ *  Thu Sep 18 19:36:19 CEST 2014
+ *  Copyright 2014 Bent Bisballe Nyeng
+ *  deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ *  This file is part of SimpleRTP.
+ *
+ *  SimpleRTP is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  SimpleRTP is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with SimpleRTP; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#ifndef __SIMPLERTP_V4L_H__
+#define __SIMPLERTP_V4L_H__
+
+#include <QThread>
+#include <QImage>
+
+class V4L : public QThread {
+Q_OBJECT
+public:
+  V4L();
+  ~V4L();
+
+  void run();
+
+  void processImage(const void *p, int size);
+
+signals:
+  void newImage(QImage image);
+};
+
+#endif/*__SIMPLERTP_V4L_H__*/