gstv4l2object.c 63.2 KB
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/* GStreamer
 *
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 * Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
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 *               2006 Edgard Lima <edgard.lima@indt.org.br>
 *
 * gstv4l2object.c: base class for V4L2 elements
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 *
 * This library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Library General Public License as published
 * by the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version. This library 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 Library General Public License for more details.
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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 * USA.
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 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>

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#ifdef HAVE_GUDEV
#include <gudev/gudev.h>
#endif

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#include "v4l2_calls.h"
#include "gstv4l2tuner.h"
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#ifdef HAVE_XVIDEO
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#include "gstv4l2xoverlay.h"
#endif
#include "gstv4l2colorbalance.h"

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#include "gst/gst-i18n-plugin.h"

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#include <gst/video/video.h>

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/* videodev2.h is not versioned and we can't easily check for the presence
 * of enum values at compile time, but the V4L2_CAP_VIDEO_OUTPUT_OVERLAY define
 * was added in the same commit as V4L2_FIELD_INTERLACED_{TB,BT} (b2787845) */
#ifndef V4L2_CAP_VIDEO_OUTPUT_OVERLAY
#define V4L2_FIELD_INTERLACED_TB 8
#define V4L2_FIELD_INTERLACED_BT 9
#endif
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GST_DEBUG_CATEGORY_EXTERN (v4l2_debug);
#define GST_CAT_DEFAULT v4l2_debug


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#define DEFAULT_PROP_DEVICE_NAME 	NULL
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#define DEFAULT_PROP_DEVICE_FD          -1
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#define DEFAULT_PROP_FLAGS              0
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#define DEFAULT_PROP_TV_NORM            0
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#define DEFAULT_PROP_CHANNEL            NULL
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#define DEFAULT_PROP_FREQUENCY          0

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enum
{
  PROP_0,
  V4L2_STD_OBJECT_PROPS,
};

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G_LOCK_DEFINE_STATIC (probe_lock);

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const GList *
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gst_v4l2_probe_get_properties (GstPropertyProbe * probe)
{
  GObjectClass *klass = G_OBJECT_GET_CLASS (probe);
  static GList *list = NULL;

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  G_LOCK (probe_lock);
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  if (!list) {
    list = g_list_append (NULL, g_object_class_find_property (klass, "device"));
  }

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  G_UNLOCK (probe_lock);
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  return list;
}

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static gboolean init = FALSE;
static GList *devices = NULL;

#ifdef HAVE_GUDEV
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static gboolean
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gst_v4l2_class_probe_devices_with_udev (GstElementClass * klass, gboolean check,
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    GList ** klass_devices)
{
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  GUdevClient *client = NULL;
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  GList *item;

  if (!check) {
    while (devices) {
      gchar *device = devices->data;
      devices = g_list_remove (devices, device);
      g_free (device);
    }

    GST_INFO ("Enumerating video4linux devices from udev");
    client = g_udev_client_new (NULL);
    if (!client) {
      GST_WARNING ("Failed to initialize gudev client");
      goto finish;
    }

    item = g_udev_client_query_by_subsystem (client, "video4linux");
    while (item) {
      GUdevDevice *device = item->data;
      gchar *devnode = g_strdup (g_udev_device_get_device_file (device));
      gint api = g_udev_device_get_property_as_int (device, "ID_V4L_VERSION");
      GST_INFO ("Found new device: %s, API: %d", devnode, api);
      /* Append v4l2 devices only. If api is 0 probably v4l_id has
         been stripped out of the current udev installation, append
         anyway */
      if (api == 0) {
        GST_WARNING
            ("Couldn't retrieve ID_V4L_VERSION, silly udev installation?");
      }
      if ((api == 2 || api == 0)) {
        devices = g_list_append (devices, devnode);
      } else {
        g_free (devnode);
      }
      g_object_unref (device);
      item = item->next;
    }
    g_list_free (item);
    init = TRUE;
  }

finish:
  if (client) {
    g_object_unref (client);
  }

  *klass_devices = devices;
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  return init;
}
#endif /* HAVE_GUDEV */

static gboolean
gst_v4l2_class_probe_devices (GstElementClass * klass, gboolean check,
    GList ** klass_devices)
{
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  if (!check) {
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    const gchar *dev_base[] = { "/dev/video", "/dev/v4l2/video", NULL };
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    gint base, n, fd;

    while (devices) {
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      gchar *device = devices->data;
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      devices = g_list_remove (devices, device);
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      g_free (device);
    }

    /*
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     * detect /dev entries
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     */
    for (n = 0; n < 64; n++) {
      for (base = 0; dev_base[base] != NULL; base++) {
        struct stat s;
        gchar *device = g_strdup_printf ("%s%d",
            dev_base[base],
            n);

        /*
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         * does the /dev/ entry exist at all?
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         */
        if (stat (device, &s) == 0) {
          /*
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           * yes: is a device attached?
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           */
          if (S_ISCHR (s.st_mode)) {

            if ((fd = open (device, O_RDWR | O_NONBLOCK)) > 0 || errno == EBUSY) {
              if (fd > 0)
                close (fd);

              devices = g_list_append (devices, device);
              break;
            }
          }
        }
        g_free (device);
      }
    }
    init = TRUE;
  }

  *klass_devices = devices;

  return init;
}

void
gst_v4l2_probe_probe_property (GstPropertyProbe * probe,
    guint prop_id, const GParamSpec * pspec, GList ** klass_devices)
{
  GstElementClass *klass = GST_ELEMENT_GET_CLASS (probe);

  switch (prop_id) {
    case PROP_DEVICE:
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#ifdef HAVE_GUDEV
      if (!gst_v4l2_class_probe_devices_with_udev (klass, FALSE, klass_devices))
        gst_v4l2_class_probe_devices (klass, FALSE, klass_devices);
#else /* !HAVE_GUDEV */
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      gst_v4l2_class_probe_devices (klass, FALSE, klass_devices);
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#endif /* HAVE_GUDEV */
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      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
      break;
  }
}

gboolean
gst_v4l2_probe_needs_probe (GstPropertyProbe * probe,
    guint prop_id, const GParamSpec * pspec, GList ** klass_devices)
{
  GstElementClass *klass = GST_ELEMENT_GET_CLASS (probe);
  gboolean ret = FALSE;

  switch (prop_id) {
    case PROP_DEVICE:
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#ifdef HAVE_GUDEV
      ret =
          !gst_v4l2_class_probe_devices_with_udev (klass, FALSE, klass_devices);
#else /* !HAVE_GUDEV */
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      ret = !gst_v4l2_class_probe_devices (klass, TRUE, klass_devices);
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#endif /* HAVE_GUDEV */
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      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
      break;
  }
  return ret;
}

static GValueArray *
gst_v4l2_class_list_devices (GstElementClass * klass, GList ** klass_devices)
{
  GValueArray *array;
  GValue value = { 0 };
  GList *item;

  if (!*klass_devices)
    return NULL;

  array = g_value_array_new (g_list_length (*klass_devices));
  item = *klass_devices;
  g_value_init (&value, G_TYPE_STRING);
  while (item) {
    gchar *device = item->data;

    g_value_set_string (&value, device);
    g_value_array_append (array, &value);

    item = item->next;
  }
  g_value_unset (&value);

  return array;
}

GValueArray *
gst_v4l2_probe_get_values (GstPropertyProbe * probe,
    guint prop_id, const GParamSpec * pspec, GList ** klass_devices)
{
  GstElementClass *klass = GST_ELEMENT_GET_CLASS (probe);
  GValueArray *array = NULL;

  switch (prop_id) {
    case PROP_DEVICE:
      array = gst_v4l2_class_list_devices (klass, klass_devices);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
      break;
  }

  return array;
}

#define GST_TYPE_V4L2_DEVICE_FLAGS (gst_v4l2_device_get_type ())
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static GType
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gst_v4l2_device_get_type (void)
{
  static GType v4l2_device_type = 0;

  if (v4l2_device_type == 0) {
    static const GFlagsValue values[] = {
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      {V4L2_CAP_VIDEO_CAPTURE, "Device supports video capture", "capture"},
      {V4L2_CAP_VIDEO_OUTPUT, "Device supports video playback", "output"},
      {V4L2_CAP_VIDEO_OVERLAY, "Device supports video overlay", "overlay"},

      {V4L2_CAP_VBI_CAPTURE, "Device supports the VBI capture", "vbi-capture"},
      {V4L2_CAP_VBI_OUTPUT, "Device supports the VBI output", "vbi-output"},

      {V4L2_CAP_TUNER, "Device has a tuner or modulator", "tuner"},
      {V4L2_CAP_AUDIO, "Device has audio inputs or outputs", "audio"},
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      {0, NULL, NULL}
    };

    v4l2_device_type =
        g_flags_register_static ("GstV4l2DeviceTypeFlags", values);
  }

  return v4l2_device_type;
}

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#define GST_TYPE_V4L2_TV_NORM (gst_v4l2_tv_norm_get_type ())
static GType
gst_v4l2_tv_norm_get_type (void)
{
  static GType v4l2_tv_norm = 0;

  if (!v4l2_tv_norm) {
    static const GEnumValue tv_norms[] = {
      {0, "none", "none"},

      {V4L2_STD_NTSC, "NTSC", "NTSC"},
      {V4L2_STD_NTSC_M, "NTSC-M", "NTSC-M"},
      {V4L2_STD_NTSC_M_JP, "NTSC-M-JP", "NTSC-M-JP"},
      {V4L2_STD_NTSC_M_KR, "NTSC-M-KR", "NTSC-M-KR"},
      {V4L2_STD_NTSC_443, "NTSC-443", "NTSC-443"},

      {V4L2_STD_PAL, "PAL", "PAL"},
      {V4L2_STD_PAL_BG, "PAL-BG", "PAL-BG"},
      {V4L2_STD_PAL_B, "PAL-B", "PAL-B"},
      {V4L2_STD_PAL_B1, "PAL-B1", "PAL-B1"},
      {V4L2_STD_PAL_G, "PAL-G", "PAL-G"},
      {V4L2_STD_PAL_H, "PAL-H", "PAL-H"},
      {V4L2_STD_PAL_I, "PAL-I", "PAL-I"},
      {V4L2_STD_PAL_DK, "PAL-DK", "PAL-DK"},
      {V4L2_STD_PAL_D, "PAL-D", "PAL-D"},
      {V4L2_STD_PAL_D1, "PAL-D1", "PAL-D1"},
      {V4L2_STD_PAL_K, "PAL-K", "PAL-K"},
      {V4L2_STD_PAL_M, "PAL-M", "PAL-M"},
      {V4L2_STD_PAL_N, "PAL-N", "PAL-N"},
      {V4L2_STD_PAL_Nc, "PAL-Nc", "PAL-Nc"},
      {V4L2_STD_PAL_60, "PAL-60", "PAL-60"},

      {V4L2_STD_SECAM, "SECAM", "SECAM"},
      {V4L2_STD_SECAM_B, "SECAM-B", "SECAM-B"},
      {V4L2_STD_SECAM_G, "SECAM-G", "SECAM-G"},
      {V4L2_STD_SECAM_H, "SECAM-H", "SECAM-H"},
      {V4L2_STD_SECAM_DK, "SECAM-DK", "SECAM-DK"},
      {V4L2_STD_SECAM_D, "SECAM-D", "SECAM-D"},
      {V4L2_STD_SECAM_K, "SECAM-K", "SECAM-K"},
      {V4L2_STD_SECAM_K1, "SECAM-K1", "SECAM-K1"},
      {V4L2_STD_SECAM_L, "SECAM-L", "SECAM-L"},
      {V4L2_STD_SECAM_LC, "SECAM-Lc", "SECAM-Lc"},

      {0, NULL, NULL}
    };

    v4l2_tv_norm = g_enum_register_static ("V4L2_TV_norms", tv_norms);
  }

  return v4l2_tv_norm;
}

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void
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gst_v4l2_object_install_properties_helper (GObjectClass * gobject_class,
    const char *default_device)
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{
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  g_object_class_install_property (gobject_class, PROP_DEVICE,
      g_param_spec_string ("device", "Device", "Device location",
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          default_device, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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  g_object_class_install_property (gobject_class, PROP_DEVICE_NAME,
      g_param_spec_string ("device-name", "Device name",
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          "Name of the device", DEFAULT_PROP_DEVICE_NAME,
          G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
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  g_object_class_install_property (gobject_class, PROP_DEVICE_FD,
      g_param_spec_int ("device-fd", "File descriptor",
          "File descriptor of the device", -1, G_MAXINT, DEFAULT_PROP_DEVICE_FD,
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          G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
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  g_object_class_install_property (gobject_class, PROP_FLAGS,
      g_param_spec_flags ("flags", "Flags", "Device type flags",
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          GST_TYPE_V4L2_DEVICE_FLAGS, DEFAULT_PROP_FLAGS,
          G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
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  /**
   * GstV4l2Src:brightness
   *
   * Picture brightness, or more precisely, the black level
   *
   * Since: 0.10.26
   */
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  g_object_class_install_property (gobject_class, PROP_BRIGHTNESS,
      g_param_spec_int ("brightness", "Brightness",
          "Picture brightness, or more precisely, the black level", G_MININT,
          G_MAXINT, 0,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
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  /**
   * GstV4l2Src:contrast
   *
   * Picture contrast or luma gain
   *
   * Since: 0.10.26
   */
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  g_object_class_install_property (gobject_class, PROP_CONTRAST,
      g_param_spec_int ("contrast", "Contrast",
          "Picture contrast or luma gain", G_MININT,
          G_MAXINT, 0,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
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  /**
   * GstV4l2Src:saturation
   *
   * Picture color saturation or chroma gain
   *
   * Since: 0.10.26
   */
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  g_object_class_install_property (gobject_class, PROP_SATURATION,
      g_param_spec_int ("saturation", "Saturation",
          "Picture color saturation or chroma gain", G_MININT,
          G_MAXINT, 0,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
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  /**
   * GstV4l2Src:hue
   *
   * Hue or color balance
   *
   * Since: 0.10.26
   */
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  g_object_class_install_property (gobject_class, PROP_HUE,
      g_param_spec_int ("hue", "Hue",
          "Hue or color balance", G_MININT,
          G_MAXINT, 0,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
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  /**
   * GstV4l2Src:norm
   *
   * TV norm
   *
   * Since: 0.10.30
   */
  g_object_class_install_property (gobject_class, PROP_TV_NORM,
      g_param_spec_enum ("norm", "TV norm",
          "video standard",
          GST_TYPE_V4L2_TV_NORM, DEFAULT_PROP_TV_NORM,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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}

GstV4l2Object *
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gst_v4l2_object_new (GstElement * element,
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    enum v4l2_buf_type type,
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    const char *default_device,
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    GstV4l2GetInOutFunction get_in_out_func,
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    GstV4l2SetInOutFunction set_in_out_func,
    GstV4l2UpdateFpsFunction update_fps_func)
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{
  GstV4l2Object *v4l2object;

  /*
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   * some default values
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   */
  v4l2object = g_new0 (GstV4l2Object, 1);

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  v4l2object->type = type;
  v4l2object->formats = NULL;

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  v4l2object->element = element;
  v4l2object->get_in_out_func = get_in_out_func;
  v4l2object->set_in_out_func = set_in_out_func;
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  v4l2object->update_fps_func = update_fps_func;
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  v4l2object->video_fd = -1;
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  v4l2object->poll = gst_poll_new (TRUE);
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  v4l2object->buffer = NULL;
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  v4l2object->videodev = g_strdup (default_device);
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  v4l2object->norms = NULL;
  v4l2object->channels = NULL;
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  v4l2object->colors = NULL;

  v4l2object->xwindow_id = 0;

  return v4l2object;
}

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static gboolean gst_v4l2_object_clear_format_list (GstV4l2Object * v4l2object);


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void
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gst_v4l2_object_destroy (GstV4l2Object * v4l2object)
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{
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  g_return_if_fail (v4l2object != NULL);
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  if (v4l2object->videodev)
    g_free (v4l2object->videodev);

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  if (v4l2object->poll)
    gst_poll_free (v4l2object->poll);

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  if (v4l2object->channel)
    g_free (v4l2object->channel);

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  if (v4l2object->formats) {
    gst_v4l2_object_clear_format_list (v4l2object);
  }

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  g_free (v4l2object);
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}

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static gboolean
gst_v4l2_object_clear_format_list (GstV4l2Object * v4l2object)
{
  g_slist_foreach (v4l2object->formats, (GFunc) g_free, NULL);
  g_slist_free (v4l2object->formats);
  v4l2object->formats = NULL;

  return TRUE;
}

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static gint
gst_v4l2_object_prop_to_cid (guint prop_id)
{
  gint cid = -1;

  switch (prop_id) {
    case PROP_BRIGHTNESS:
      cid = V4L2_CID_BRIGHTNESS;
      break;
    case PROP_CONTRAST:
      cid = V4L2_CID_CONTRAST;
      break;
    case PROP_SATURATION:
      cid = V4L2_CID_SATURATION;
      break;
    case PROP_HUE:
      cid = V4L2_CID_HUE;
      break;
    default:
      GST_WARNING ("unmapped property id: %d", prop_id);
  }
  return cid;
}

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gboolean
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gst_v4l2_object_set_property_helper (GstV4l2Object * v4l2object,
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    guint prop_id, const GValue * value, GParamSpec * pspec)
{
  switch (prop_id) {
    case PROP_DEVICE:
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      g_free (v4l2object->videodev);
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      v4l2object->videodev = g_value_dup_string (value);
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      break;
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    case PROP_BRIGHTNESS:
    case PROP_CONTRAST:
    case PROP_SATURATION:
    case PROP_HUE:
    {
      gint cid = gst_v4l2_object_prop_to_cid (prop_id);

      if (cid != -1) {
        if (GST_V4L2_IS_OPEN (v4l2object)) {
          gst_v4l2_set_attribute (v4l2object, cid, g_value_get_int (value));
        }
      }
      return TRUE;
    }
      break;
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    case PROP_TV_NORM:
      v4l2object->tv_norm = g_value_get_enum (value);
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      break;
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#if 0
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    case PROP_CHANNEL:
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      if (GST_V4L2_IS_OPEN (v4l2object)) {
        GstTuner *tuner = GST_TUNER (v4l2object->element);
        GstTunerChannel *channel = gst_tuner_find_channel_by_name (tuner,
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            (gchar *) g_value_get_string (value));
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        if (channel) {
          /* like gst_tuner_set_channel (tuner, channel)
             without g_object_notify */
          gst_v4l2_tuner_set_channel (v4l2object, channel);
        }
      } else {
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        g_free (v4l2object->channel);
        v4l2object->channel = g_value_dup_string (value);
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      }
      break;
    case PROP_FREQUENCY:
      if (GST_V4L2_IS_OPEN (v4l2object)) {
        GstTuner *tuner = GST_TUNER (v4l2object->element);
        GstTunerChannel *channel = gst_tuner_get_channel (tuner);

        if (channel &&
            GST_TUNER_CHANNEL_HAS_FLAG (channel, GST_TUNER_CHANNEL_FREQUENCY)) {
          /* like
             gst_tuner_set_frequency (tuner, channel, g_value_get_ulong (value))
             without g_object_notify */
          gst_v4l2_tuner_set_frequency (v4l2object, channel,
              g_value_get_ulong (value));
        }
      } else {
        v4l2object->frequency = g_value_get_ulong (value);
      }
      break;
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#endif
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    default:
      return FALSE;
      break;
  }
  return TRUE;
}


gboolean
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gst_v4l2_object_get_property_helper (GstV4l2Object * v4l2object,
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    guint prop_id, GValue * value, GParamSpec * pspec)
{
  switch (prop_id) {
    case PROP_DEVICE:
      g_value_set_string (value, v4l2object->videodev);
      break;
    case PROP_DEVICE_NAME:
    {
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      const guchar *new = NULL;
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      if (GST_V4L2_IS_OPEN (v4l2object)) {
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        new = v4l2object->vcap.card;
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      } else if (gst_v4l2_open (v4l2object)) {
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        new = v4l2object->vcap.card;
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        gst_v4l2_close (v4l2object);
      }
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      g_value_set_string (value, (gchar *) new);
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      break;
    }
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    case PROP_DEVICE_FD:
    {
      if (GST_V4L2_IS_OPEN (v4l2object))
        g_value_set_int (value, v4l2object->video_fd);
      else
        g_value_set_int (value, DEFAULT_PROP_DEVICE_FD);
      break;
    }
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    case PROP_FLAGS:
    {
      guint flags = 0;

      if (GST_V4L2_IS_OPEN (v4l2object)) {
        flags |= v4l2object->vcap.capabilities &
            (V4L2_CAP_VIDEO_CAPTURE |
            V4L2_CAP_VIDEO_OUTPUT |
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            V4L2_CAP_VIDEO_OVERLAY |
            V4L2_CAP_VBI_CAPTURE |
            V4L2_CAP_VBI_OUTPUT | V4L2_CAP_TUNER | V4L2_CAP_AUDIO);
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      }
      g_value_set_flags (value, flags);
      break;
    }
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    case PROP_BRIGHTNESS:
    case PROP_CONTRAST:
    case PROP_SATURATION:
    case PROP_HUE:
    {
      gint cid = gst_v4l2_object_prop_to_cid (prop_id);

      if (cid != -1) {
        if (GST_V4L2_IS_OPEN (v4l2object)) {
          gint v;
          if (gst_v4l2_get_attribute (v4l2object, cid, &v)) {
            g_value_set_int (value, v);
          }
        }
      }
      return TRUE;
    }
      break;
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    case PROP_TV_NORM:
      g_value_set_enum (value, v4l2object->tv_norm);
      break;
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    default:
      return FALSE;
      break;
  }
  return TRUE;
}

static void
gst_v4l2_set_defaults (GstV4l2Object * v4l2object)
{
  GstTunerNorm *norm = NULL;
  GstTunerChannel *channel = NULL;
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  GstTuner *tuner;

  if (!GST_IS_TUNER (v4l2object->element))
    return;

  tuner = GST_TUNER (v4l2object->element);
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  if (v4l2object->tv_norm)
    norm = gst_v4l2_tuner_get_norm_by_std_id (v4l2object, v4l2object->tv_norm);
  GST_DEBUG_OBJECT (v4l2object->element, "tv_norm=%d, norm=%p",
      v4l2object->tv_norm, norm);
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  if (norm) {
    gst_tuner_set_norm (tuner, norm);
  } else {
    norm =
        GST_TUNER_NORM (gst_tuner_get_norm (GST_TUNER (v4l2object->element)));
    if (norm) {
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      v4l2object->tv_norm =
          gst_v4l2_tuner_get_std_id_by_norm (v4l2object, norm);
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      gst_tuner_norm_changed (tuner, norm);
    }
  }

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  if (v4l2object->channel)
    channel = gst_tuner_find_channel_by_name (tuner, v4l2object->channel);
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  if (channel) {
    gst_tuner_set_channel (tuner, channel);
  } else {
    channel =
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        GST_TUNER_CHANNEL (gst_tuner_get_channel (GST_TUNER
            (v4l2object->element)));
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    if (channel) {
      g_free (v4l2object->channel);
      v4l2object->channel = g_strdup (channel->label);
      gst_tuner_channel_changed (tuner, channel);
    }
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  }

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  if (channel
      && GST_TUNER_CHANNEL_HAS_FLAG (channel, GST_TUNER_CHANNEL_FREQUENCY)) {
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    if (v4l2object->frequency != 0) {
      gst_tuner_set_frequency (tuner, channel, v4l2object->frequency);
    } else {
      v4l2object->frequency = gst_tuner_get_frequency (tuner, channel);
      if (v4l2object->frequency == 0) {
        /* guess */
        gst_tuner_set_frequency (tuner, channel, 1000);
      } else {
      }
    }
  }
}

gboolean
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gst_v4l2_object_start (GstV4l2Object * v4l2object)
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{
  if (gst_v4l2_open (v4l2object))
    gst_v4l2_set_defaults (v4l2object);
  else
    return FALSE;

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#ifdef HAVE_XVIDEO
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  gst_v4l2_xoverlay_start (v4l2object);
#endif

  return TRUE;
}

gboolean
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gst_v4l2_object_stop (GstV4l2Object * v4l2object)
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{
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#ifdef HAVE_XVIDEO
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  gst_v4l2_xoverlay_stop (v4l2object);
#endif

  if (!gst_v4l2_close (v4l2object))
    return FALSE;

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  if (v4l2object->formats) {
    gst_v4l2_object_clear_format_list (v4l2object);
  }

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  return TRUE;
}
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/*
 * common format / caps utilities:
 */
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typedef struct
{
  guint32 format;
  gboolean dimensions;
} GstV4L2FormatDesc;
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static const GstV4L2FormatDesc gst_v4l2_formats[] = {
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  /* from Linux 2.6.15 videodev2.h */
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  {V4L2_PIX_FMT_RGB332, TRUE},
  {V4L2_PIX_FMT_RGB555, TRUE},
  {V4L2_PIX_FMT_RGB565, TRUE},
  {V4L2_PIX_FMT_RGB555X, TRUE},
  {V4L2_PIX_FMT_RGB565X, TRUE},
  {V4L2_PIX_FMT_BGR24, TRUE},
  {V4L2_PIX_FMT_RGB24, TRUE},
  {V4L2_PIX_FMT_BGR32, TRUE},
  {V4L2_PIX_FMT_RGB32, TRUE},
  {V4L2_PIX_FMT_GREY, TRUE},
  {V4L2_PIX_FMT_YVU410, TRUE},
  {V4L2_PIX_FMT_YVU420, TRUE},
  {V4L2_PIX_FMT_YUYV, TRUE},
  {V4L2_PIX_FMT_UYVY, TRUE},
  {V4L2_PIX_FMT_YUV422P, TRUE},
  {V4L2_PIX_FMT_YUV411P, TRUE},
  {V4L2_PIX_FMT_Y41P, TRUE},
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  /* two planes -- one Y, one Cr + Cb interleaved  */
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  {V4L2_PIX_FMT_NV12, TRUE},
  {V4L2_PIX_FMT_NV21, TRUE},
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  /*  The following formats are not defined in the V4L2 specification */
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  {V4L2_PIX_FMT_YUV410, TRUE},
  {V4L2_PIX_FMT_YUV420, TRUE},
  {V4L2_PIX_FMT_YYUV, TRUE},
  {V4L2_PIX_FMT_HI240, TRUE},
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  /* see http://www.siliconimaging.com/RGB%20Bayer.htm */
#ifdef V4L2_PIX_FMT_SBGGR8
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  {V4L2_PIX_FMT_SBGGR8, TRUE},
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#endif

  /* compressed formats */
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  {V4L2_PIX_FMT_MJPEG, TRUE},
  {V4L2_PIX_FMT_JPEG, TRUE},
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#ifdef V4L2_PIX_FMT_PJPG
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  {V4L2_PIX_FMT_PJPG, TRUE},
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#endif
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  {V4L2_PIX_FMT_DV, TRUE},
  {V4L2_PIX_FMT_MPEG, FALSE},
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  /*  Vendor-specific formats   */
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  {V4L2_PIX_FMT_WNVA, TRUE},
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#ifdef V4L2_PIX_FMT_SN9C10X
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  {V4L2_PIX_FMT_SN9C10X, TRUE},
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#endif
#ifdef V4L2_PIX_FMT_PWC1
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  {V4L2_PIX_FMT_PWC1, TRUE},
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#endif
#ifdef V4L2_PIX_FMT_PWC2
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  {V4L2_PIX_FMT_PWC2, TRUE},
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#endif
#ifdef V4L2_PIX_FMT_YVYU
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  {V4L2_PIX_FMT_YVYU, TRUE},
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#endif
};

#define GST_V4L2_FORMAT_COUNT (G_N_ELEMENTS (gst_v4l2_formats))


static struct v4l2_fmtdesc *
gst_v4l2_object_get_format_from_fourcc (GstV4l2Object * v4l2object,
    guint32 fourcc)
{
  struct v4l2_fmtdesc *fmt;
  GSList *walk;

  if (fourcc == 0)
    return NULL;

  walk = gst_v4l2_object_get_format_list (v4l2object);
  while (walk) {
    fmt = (struct v4l2_fmtdesc *) walk->data;
    if (fmt->pixelformat == fourcc)
      return fmt;
    /* special case for jpeg */
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    if (fmt->pixelformat == V4L2_PIX_FMT_MJPEG ||
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        fmt->pixelformat == V4L2_PIX_FMT_JPEG
#ifdef V4L2_PIX_FMT_PJPG
        || fmt->pixelformat == V4L2_PIX_FMT_PJPG
#endif
        ) {
      if (fourcc == V4L2_PIX_FMT_JPEG || fourcc == V4L2_PIX_FMT_MJPEG
#ifdef V4L2_PIX_FMT_PJPG
          || fourcc == V4L2_PIX_FMT_PJPG
#endif
          ) {
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        return fmt;
      }
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    }
    walk = g_slist_next (walk);
  }

  return NULL;
}



/* complete made up ranking, the values themselves are meaningless */
#define YUV_BASE_RANK     1000
#define JPEG_BASE_RANK     500
#define DV_BASE_RANK       200
#define RGB_BASE_RANK      100
#define YUV_ODD_BASE_RANK   50
#define RGB_ODD_BASE_RANK   25
#define BAYER_BASE_RANK     15
#define S910_BASE_RANK      10
#define GREY_BASE_RANK       5
#define PWC_BASE_RANK        1

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/* This flag is already used by libv4l2 although
 * it was added to the Linux kernel in 2.6.32
 */
#ifndef V4L2_FMT_FLAG_EMULATED
#define V4L2_FMT_FLAG_EMULATED 0x0002
#endif

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static gint
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gst_v4l2_object_format_get_rank (const struct v4l2_fmtdesc *fmt)
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{
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  guint32 fourcc = fmt->pixelformat;
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  gboolean emulated = ((fmt->flags & V4L2_FMT_FLAG_EMULATED) != 0);
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  gint rank = 0;

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  switch (fourcc) {
    case V4L2_PIX_FMT_MJPEG:
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#ifdef V4L2_PIX_FMT_PJPG
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    case V4L2_PIX_FMT_PJPG:
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      rank = JPEG_BASE_RANK;
      break;
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#endif
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    case V4L2_PIX_FMT_JPEG:
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      rank = JPEG_BASE_RANK + 1;
      break;
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    case V4L2_PIX_FMT_MPEG:    /* MPEG          */
      rank = JPEG_BASE_RANK + 2;
      break;
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    case V4L2_PIX_FMT_RGB332:
    case V4L2_PIX_FMT_RGB555:
    case V4L2_PIX_FMT_RGB555X:
    case V4L2_PIX_FMT_RGB565:
    case V4L2_PIX_FMT_RGB565X:
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      rank = RGB_ODD_BASE_RANK;
      break;
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    case V4L2_PIX_FMT_RGB24:
    case V4L2_PIX_FMT_BGR24:
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      rank = RGB_BASE_RANK - 1;
      break;
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    case V4L2_PIX_FMT_RGB32:
    case V4L2_PIX_FMT_BGR32:
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      rank = RGB_BASE_RANK;
      break;
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    case V4L2_PIX_FMT_GREY:    /*  8  Greyscale     */
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      rank = GREY_BASE_RANK;
      break;
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    case V4L2_PIX_FMT_NV12:    /* 12  Y/CbCr 4:2:0  */
    case V4L2_PIX_FMT_NV21:    /* 12  Y/CrCb 4:2:0  */
    case V4L2_PIX_FMT_YYUV:    /* 16  YUV 4:2:2     */
    case V4L2_PIX_FMT_HI240:   /*  8  8-bit color   */
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      rank = YUV_ODD_BASE_RANK;
      break;
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    case V4L2_PIX_FMT_YVU410:  /* YVU9,  9 bits per pixel */
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      rank = YUV_BASE_RANK + 3;
      break;
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    case V4L2_PIX_FMT_YUV410:  /* YUV9,  9 bits per pixel */
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      rank = YUV_BASE_RANK + 2;
      break;
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    case V4L2_PIX_FMT_YUV420:  /* I420, 12 bits per pixel */
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      rank = YUV_BASE_RANK + 7;
      break;
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    case V4L2_PIX_FMT_YUYV:    /* YUY2, 16 bits per pixel */
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      rank = YUV_BASE_RANK + 10;
      break;
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    case V4L2_PIX_FMT_YVU420:  /* YV12, 12 bits per pixel */
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      rank = YUV_BASE_RANK + 6;
      break;
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    case V4L2_PIX_FMT_UYVY:    /* UYVY, 16 bits per pixel */
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      rank = YUV_BASE_RANK + 9;
      break;
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    case V4L2_PIX_FMT_Y41P:    /* Y41P, 12 bits per pixel */
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      rank = YUV_BASE_RANK + 5;
      break;
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    case V4L2_PIX_FMT_YUV411P: /* Y41B, 12 bits per pixel */
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      rank = YUV_BASE_RANK + 4;
      break;
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    case V4L2_PIX_FMT_YUV422P: /* Y42B, 16 bits per pixel */
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      rank = YUV_BASE_RANK + 8;
      break;
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    case V4L2_PIX_FMT_DV:
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      rank = DV_BASE_RANK;
      break;
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    case V4L2_PIX_FMT_WNVA:    /* Winnov hw compres */
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      rank = 0;
      break;
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#ifdef V4L2_PIX_FMT_SBGGR8
    case V4L2_PIX_FMT_SBGGR8:
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      rank = BAYER_BASE_RANK;
      break;
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#endif

#ifdef V4L2_PIX_FMT_SN9C10X
    case V4L2_PIX_FMT_SN9C10X:
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      rank = S910_BASE_RANK;
      break;
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#endif

#ifdef V4L2_PIX_FMT_PWC1
    case V4L2_PIX_FMT_PWC1:
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      rank = PWC_BASE_RANK;
      break;
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#endif
#ifdef V4L2_PIX_FMT_PWC2
    case V4L2_PIX_FMT_PWC2:
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      rank = PWC_BASE_RANK;
      break;
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#endif

    default:
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      rank = 0;
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      break;
  }

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  /* All ranks are below 1<<15 so a shift by 15
   * will a) make all non-emulated formats larger
   * than emulated and b) will not overflow
   */
  if (!emulated)
    rank <<= 15;

  return rank;
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}



static gint
format_cmp_func (gconstpointer a, gconstpointer b)
{
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  const struct v4l2_fmtdesc *fa = a;
  const struct v4l2_fmtdesc *fb = b;
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  if (fa->pixelformat == fb->pixelformat)
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    return 0;

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  return gst_v4l2_object_format_get_rank (fb) -
      gst_v4l2_object_format_get_rank (fa);
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}

/******************************************************
 * gst_v4l2_object_fill_format_list():
 *   create list of supported capture formats
 * return value: TRUE on success, FALSE on error
 ******************************************************/
static gboolean
gst_v4l2_object_fill_format_list (GstV4l2Object * v4l2object)
{
  gint n;
  struct v4l2_fmtdesc *format;

  GST_DEBUG_OBJECT (v4l2object->element, "getting src format enumerations");

  /* format enumeration */
  for (n = 0;; n++) {
    format = g_new0 (struct v4l2_fmtdesc, 1);

    format->index = n;
    format->type = v4l2object->type;

    if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENUM_FMT, format) < 0) {
      if (errno == EINVAL) {
        g_free (format);
        break;                  /* end of enumeration */
      } else {
        goto failed;
      }
    }

    GST_LOG_OBJECT (v4l2object->element, "index:       %u", format->index);
    GST_LOG_OBJECT (v4l2object->element, "type:        %d", format->type);
    GST_LOG_OBJECT (v4l2object->element, "flags:       %08x", format->flags);
    GST_LOG_OBJECT (v4l2object->element, "description: '%s'",
        format->description);
    GST_LOG_OBJECT (v4l2object->element, "pixelformat: %" GST_FOURCC_FORMAT,
        GST_FOURCC_ARGS (format->pixelformat));

    /* sort formats according to our preference;  we do this, because caps
     * are probed in the order the formats are in the list, and the order of
     * formats in the final probed caps matters for things like fixation */
    v4l2object->formats = g_slist_insert_sorted (v4l2object->formats, format,
        (GCompareFunc) format_cmp_func);
  }

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#ifndef GST_DISABLE_GST_DEBUG
  {
    GSList *l;

    GST_INFO_OBJECT (v4l2object->element, "got %d format(s):", n);
    for (l = v4l2object->formats; l != NULL; l = l->next) {
      format = l->data;

      GST_INFO_OBJECT (v4l2object->element,
          "  %" GST_FOURCC_FORMAT "%s", GST_FOURCC_ARGS (format->pixelformat),
          ((format->flags & V4L2_FMT_FLAG_EMULATED)) ? " (emulated)" : "");
    }
  }
#endif
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  return TRUE;

  /* ERRORS */
failed:
  {
    GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
        (_("Failed to enumerate possible video formats device '%s' can work with"), v4l2object->videodev), ("Failed to get number %d in pixelformat enumeration for %s. (%d - %s)", n, v4l2object->videodev, errno, g_strerror (errno)));
    g_free (format);
    return FALSE;
  }
}

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/*
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 * Get the list of supported capture formats, a list of
 * <code>struct v4l2_fmtdesc</code>.
 */
GSList *
gst_v4l2_object_get_format_list (GstV4l2Object * v4l2object)
{
  if (!v4l2object->formats)
    gst_v4l2_object_fill_format_list (v4l2object);
  return v4l2object->formats;
}


GstStructure *
gst_v4l2_object_v4l2fourcc_to_structure (guint32 fourcc)
{
  GstStructure *structure = NULL;

  switch (fourcc) {
    case V4L2_PIX_FMT_MJPEG:   /* Motion-JPEG */
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#ifdef V4L2_PIX_FMT_PJPG
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    case V4L2_PIX_FMT_PJPG:    /* Progressive-JPEG */
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#endif
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    case V4L2_PIX_FMT_JPEG:    /* JFIF JPEG */
      structure = gst_structure_new ("image/jpeg", NULL);
      break;
    case V4L2_PIX_FMT_YYUV:    /* 16  YUV 4:2:2     */
    case V4L2_PIX_FMT_HI240:   /*  8  8-bit color   */
      /* FIXME: get correct fourccs here */
      break;
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    case V4L2_PIX_FMT_RGB332:
    case V4L2_PIX_FMT_RGB555X:
    case V4L2_PIX_FMT_RGB565X:
      /* FIXME: get correct fourccs here */
      break;
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    case V4L2_PIX_FMT_GREY:    /*  8  Greyscale     */
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    case V4L2_PIX_FMT_RGB555:
    case V4L2_PIX_FMT_RGB565:
    case V4L2_PIX_FMT_RGB24:
    case V4L2_PIX_FMT_BGR24:
    case V4L2_PIX_FMT_RGB32:
    case V4L2_PIX_FMT_BGR32:
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    case V4L2_PIX_FMT_NV12:    /* 12  Y/CbCr 4:2:0  */
    case V4L2_PIX_FMT_NV21:    /* 12  Y/CrCb 4:2:0  */
    case V4L2_PIX_FMT_YVU410:
    case V4L2_PIX_FMT_YUV410:
    case V4L2_PIX_FMT_YUV420:  /* I420/IYUV */
    case V4L2_PIX_FMT_YUYV:
    case V4L2_PIX_FMT_YVU420:
    case V4L2_PIX_FMT_UYVY:
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#if 0
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    case V4L2_PIX_FMT_Y41P:
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#endif
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    case V4L2_PIX_FMT_YUV422P:
#ifdef V4L2_PIX_FMT_YVYU
    case V4L2_PIX_FMT_YVYU:
#endif
    case V4L2_PIX_FMT_YUV411P:{
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      GstVideoFormat format;
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      switch (fourcc) {
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        case V4L2_PIX_FMT_GREY:        /*  8  Greyscale     */
          format = GST_VIDEO_FORMAT_GRAY8;
          break;
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        case V4L2_PIX_FMT_RGB555:
          format = GST_VIDEO_FORMAT_RGB15;
          break;
        case V4L2_PIX_FMT_RGB565:
          format = GST_VIDEO_FORMAT_RGB16;
          break;
        case V4L2_PIX_FMT_RGB24:
          format = GST_VIDEO_FORMAT_RGB;
          break;
        case V4L2_PIX_FMT_BGR24:
          format = GST_VIDEO_FORMAT_BGR;
          break;
        case V4L2_PIX_FMT_RGB32:
          format = GST_VIDEO_FORMAT_RGBx;
          break;
        case V4L2_PIX_FMT_BGR32:
          format = GST_VIDEO_FORMAT_BGRx;
          break;
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        case V4L2_PIX_FMT_NV12:
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          format = GST_VIDEO_FORMAT_NV12;
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          break;
        case V4L2_PIX_FMT_NV21: