--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gst_plugins_base/sys/v4l/gstv4lelement.c	Thu Dec 17 08:53:32 2009 +0200
@@ -0,0 +1,470 @@
+/* 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;
+}