/* GStreamer

 *

 * gstv4lelement.c: base class for V4L elements

 *

 * Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>

 *

 * 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, USA.

 */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <sys/stat.h>

#include <fcntl.h>

#include <errno.h>

#include <unistd.h>

#include <string.h>

#include <gst/interfaces/propertyprobe.h>

#include "v4l_calls.h"

#include "gstv4ltuner.h"

#ifdef HAVE_XVIDEO

#include "gstv4lxoverlay.h"

#endif

#include "gstv4lcolorbalance.h"

enum

{

  PROP_0,

  PROP_DEVICE,

  PROP_DEVICE_NAME,

  PROP_FLAGS

};

static void gst_v4lelement_init_interfaces (GType type);

GST_BOILERPLATE_FULL (GstV4lElement, gst_v4lelement, GstPushSrc,

    GST_TYPE_PUSH_SRC, gst_v4lelement_init_interfaces);

static void gst_v4lelement_dispose (GObject * object);

static void gst_v4lelement_set_property (GObject * object,

    guint prop_id, const GValue * value, GParamSpec * pspec);

static void gst_v4lelement_get_property (GObject * object,

    guint prop_id, GValue * value, GParamSpec * pspec);

static gboolean gst_v4lelement_start (GstBaseSrc * src);

static gboolean gst_v4lelement_stop (GstBaseSrc * src);

static gboolean

gst_v4l_iface_supported (GstImplementsInterface * iface, GType iface_type)

{

  GstV4lElement *v4lelement = GST_V4LELEMENT (iface);

#ifdef HAVE_XVIDEO

  g_assert (iface_type == GST_TYPE_TUNER ||

      iface_type == GST_TYPE_X_OVERLAY || iface_type == GST_TYPE_COLOR_BALANCE);

#else

  g_assert (iface_type == GST_TYPE_TUNER ||

      iface_type == GST_TYPE_COLOR_BALANCE);

#endif

  if (v4lelement->video_fd == -1)

    return FALSE;

#ifdef HAVE_XVIDEO

  if (iface_type == GST_TYPE_X_OVERLAY && !GST_V4L_IS_OVERLAY (v4lelement))

    return FALSE;

#endif

  return TRUE;

}

static void

gst_v4l_interface_init (GstImplementsInterfaceClass * klass)

{

  /* default virtual functions */

  klass->supported = gst_v4l_iface_supported;

}

static const GList *

gst_v4l_probe_get_properties (GstPropertyProbe * probe)

{

  GObjectClass *klass = G_OBJECT_GET_CLASS (probe);

  static GList *list = NULL;

  if (!list) {

    list = g_list_append (NULL, g_object_class_find_property (klass, "device"));

  }

  return list;

}

static gboolean

gst_v4l_class_probe_devices (GstV4lElementClass * klass, gboolean check)

{

  static gboolean init = FALSE;

  static GList *devices = NULL;

  if (!init && !check) {

    gchar *dev_base[] = { "/dev/video", "/dev/v4l/video", NULL };

    gint base, n, fd;

    while (devices) {

      GList *item = devices;

      gchar *device = item->data;

      devices = g_list_remove (devices, item);

      g_free (device);

    }

    /* detect /dev entries */

    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);

        /* does the /dev/ entry exist at all? */

        if (stat (device, &s) == 0) {

          /* yes: is a device attached? */

          if ((fd = open (device, O_RDONLY)) > 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;

}

static void

gst_v4l_probe_probe_property (GstPropertyProbe * probe,

    guint prop_id, const GParamSpec * pspec)

{

  GstV4lElementClass *klass = GST_V4LELEMENT_GET_CLASS (probe);

  switch (prop_id) {

    case PROP_DEVICE:

      gst_v4l_class_probe_devices (klass, FALSE);

      break;

    default:

      G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);

      break;

  }

}

static gboolean

gst_v4l_probe_needs_probe (GstPropertyProbe * probe,

    guint prop_id, const GParamSpec * pspec)

{

  GstV4lElementClass *klass = GST_V4LELEMENT_GET_CLASS (probe);

  gboolean ret = FALSE;

  switch (prop_id) {

    case PROP_DEVICE:

      ret = !gst_v4l_class_probe_devices (klass, TRUE);

      break;

    default:

      G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);

      break;

  }

  return ret;

}

static GValueArray *

gst_v4l_class_list_devices (GstV4lElementClass * klass)

{

  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;

}

static GValueArray *

gst_v4l_probe_get_values (GstPropertyProbe * probe,

    guint prop_id, const GParamSpec * pspec)

{

  GstV4lElementClass *klass = GST_V4LELEMENT_GET_CLASS (probe);

  GValueArray *array = NULL;

  switch (prop_id) {

    case PROP_DEVICE:

      array = gst_v4l_class_list_devices (klass);

      break;

    default:

      G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);

      break;

  }

  return array;

}

static void

gst_v4l_property_probe_interface_init (GstPropertyProbeInterface * iface)

{

  iface->get_properties = gst_v4l_probe_get_properties;

  iface->probe_property = gst_v4l_probe_probe_property;

  iface->needs_probe = gst_v4l_probe_needs_probe;

  iface->get_values = gst_v4l_probe_get_values;

}

#define GST_TYPE_V4L_DEVICE_FLAGS (gst_v4l_device_get_type ())

static GType

gst_v4l_device_get_type (void)

{

  static GType v4l_device_type = 0;

  if (v4l_device_type == 0) {

    static const GFlagsValue values[] = {

      {VID_TYPE_CAPTURE, "CAPTURE", "Device can capture"},

      {VID_TYPE_TUNER, "TUNER", "Device has a tuner"},

      {VID_TYPE_OVERLAY, "OVERLAY", "Device can do overlay"},

      {VID_TYPE_MPEG_DECODER, "MPEG_DECODER", "Device can decode MPEG"},

      {VID_TYPE_MPEG_ENCODER, "MPEG_ENCODER", "Device can encode MPEG"},

      {VID_TYPE_MJPEG_DECODER, "MJPEG_DECODER", "Device can decode MJPEG"},

      {VID_TYPE_MJPEG_ENCODER, "MJPEG_ENCODER", "Device can encode MJPEG"},

      {0x10000, "AUDIO", "Device handles audio"},

      {0, NULL, NULL}

    };

    v4l_device_type = g_flags_register_static ("GstV4lDeviceTypeFlags", values);

  }

  return v4l_device_type;

}

static void

gst_v4lelement_init_interfaces (GType type)

{

  static const GInterfaceInfo v4liface_info = {

    (GInterfaceInitFunc) gst_v4l_interface_init,

    NULL,

    NULL,

  };

  static const GInterfaceInfo v4l_tuner_info = {

    (GInterfaceInitFunc) gst_v4l_tuner_interface_init,

    NULL,

    NULL,

  };

#ifdef HAVE_XVIDEO

  static const GInterfaceInfo v4l_xoverlay_info = {

    (GInterfaceInitFunc) gst_v4l_xoverlay_interface_init,

    NULL,

    NULL,

  };

#endif

  static const GInterfaceInfo v4l_colorbalance_info = {

    (GInterfaceInitFunc) gst_v4l_color_balance_interface_init,

    NULL,

    NULL,

  };

  static const GInterfaceInfo v4l_propertyprobe_info = {

    (GInterfaceInitFunc) gst_v4l_property_probe_interface_init,

    NULL,

    NULL,

  };

  g_type_add_interface_static (type,

      GST_TYPE_IMPLEMENTS_INTERFACE, &v4liface_info);

  g_type_add_interface_static (type, GST_TYPE_TUNER, &v4l_tuner_info);

#ifdef HAVE_XVIDEO

  g_type_add_interface_static (type, GST_TYPE_X_OVERLAY, &v4l_xoverlay_info);

#endif

  g_type_add_interface_static (type,

      GST_TYPE_COLOR_BALANCE, &v4l_colorbalance_info);

  g_type_add_interface_static (type,

      GST_TYPE_PROPERTY_PROBE, &v4l_propertyprobe_info);

}

static void

gst_v4lelement_base_init (gpointer g_class)

{

  GstV4lElementClass *klass = GST_V4LELEMENT_CLASS (g_class);

  klass->devices = NULL;

}

static void

gst_v4lelement_class_init (GstV4lElementClass * klass)

{

  GObjectClass *gobject_class;

  GstBaseSrcClass *basesrc_class;

  gobject_class = (GObjectClass *) klass;

  basesrc_class = (GstBaseSrcClass *) klass;

  gobject_class->set_property = gst_v4lelement_set_property;

  gobject_class->get_property = gst_v4lelement_get_property;

  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DEVICE,

      g_param_spec_string ("device", "Device", "Device location",

          NULL, G_PARAM_READWRITE));

  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DEVICE_NAME,

      g_param_spec_string ("device_name", "Device name", "Name of the device",

          NULL, G_PARAM_READABLE));

  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_FLAGS,

      g_param_spec_flags ("flags", "Flags", "Device type flags",

          GST_TYPE_V4L_DEVICE_FLAGS, 0, G_PARAM_READABLE));

  basesrc_class->start = gst_v4lelement_start;

  basesrc_class->stop = gst_v4lelement_stop;

  gobject_class->dispose = gst_v4lelement_dispose;

}

static void

gst_v4lelement_init (GstV4lElement * v4lelement, GstV4lElementClass * klass)

{

  /* some default values */

  v4lelement->video_fd = -1;

  v4lelement->buffer = NULL;

  v4lelement->videodev = g_strdup ("/dev/video0");

  v4lelement->norms = NULL;

  v4lelement->channels = NULL;

  v4lelement->colors = NULL;

  v4lelement->xwindow_id = 0;

}

static void

gst_v4lelement_dispose (GObject * object)

{

  GstV4lElement *v4lelement = GST_V4LELEMENT (object);

  if (v4lelement->videodev) {

    g_free (v4lelement->videodev);

    v4lelement->videodev = NULL;

  }

  if (((GObjectClass *) parent_class)->dispose)

    ((GObjectClass *) parent_class)->dispose (object);

}

static void

gst_v4lelement_set_property (GObject * object,

    guint prop_id, const GValue * value, GParamSpec * pspec)

{

  GstV4lElement *v4lelement = GST_V4LELEMENT (object);

  switch (prop_id) {

    case PROP_DEVICE:

      if (v4lelement->videodev)

        g_free (v4lelement->videodev);

      v4lelement->videodev = g_strdup (g_value_get_string (value));

      break;

    default:

      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);

      break;

  }

}

static void

gst_v4lelement_get_property (GObject * object,

    guint prop_id, GValue * value, GParamSpec * pspec)

{

  GstV4lElement *v4lelement = GST_V4LELEMENT (object);

  switch (prop_id) {

    case PROP_DEVICE:

      g_value_set_string (value, v4lelement->videodev);

      break;

    case PROP_DEVICE_NAME:{

      gchar *new = NULL;

      if (GST_V4L_IS_OPEN (v4lelement)) {

        new = v4lelement->vcap.name;

      } else if (gst_v4l_open (v4lelement)) {

        new = v4lelement->vcap.name;

        gst_v4l_close (v4lelement);

      }

      g_value_set_string (value, new);

      break;

    }

    case PROP_FLAGS:{

      guint flags = 0;

      if (GST_V4L_IS_OPEN (v4lelement)) {

        flags |= v4lelement->vcap.type & 0x3C0B;

        if (v4lelement->vcap.audios)

          flags |= 0x10000;

      }

      g_value_set_flags (value, flags);

      break;

    }

    default:

      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);

      break;

  }

}

static gboolean

gst_v4lelement_start (GstBaseSrc * src)

{

  GstV4lElement *v4lelement = GST_V4LELEMENT (src);

  if (!gst_v4l_open (v4lelement))

    return FALSE;

#ifdef HAVE_XVIDEO

  gst_v4l_xoverlay_start (v4lelement);

#endif

  return TRUE;

}

static gboolean

gst_v4lelement_stop (GstBaseSrc * src)

{

  GstV4lElement *v4lelement = GST_V4LELEMENT (src);

#ifdef HAVE_XVIDEO

  gst_v4l_xoverlay_stop (v4lelement);

#endif

  if (!gst_v4l_close (v4lelement))

    return FALSE;

  return TRUE;

}