merging autodetect from 0.8 branch

Original commit message from CVS:
merging autodetect from 0.8 branch

gst/autodetect/Makefile.am

@@ -0,0 +1,14 @@
+plugin_LTLIBRARIES = libgstautodetect.la
+
+libgstautodetect_la_SOURCES = \
+	gstautoaudiosink.c \
+	gstautodetect.c \
+	gstautovideosink.c
+libgstautodetect_la_CFLAGS = $(GST_CFLAGS) $(GCONF_CFLAGS)
+libgstautodetect_la_LIBADD = $(GCONF_LIBS)
+libgstautodetect_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
+
+noinst_HEADERS = \
+	gstautoaudiosink.h \
+	gstautodetect.h \
+	gstautovideosink.h

gst/autodetect/gstautoaudiosink.c

@@ -0,0 +1,270 @@
+/* GStreamer
+ * (c) 2005 Ronald S. 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 <string.h>
+
+#include "gstautoaudiosink.h"
+#include "gstautodetect.h"
+
+static void gst_auto_audio_sink_base_init (GstAutoAudioSinkClass * klass);
+static void gst_auto_audio_sink_class_init (GstAutoAudioSinkClass * klass);
+static void gst_auto_audio_sink_init (GstAutoAudioSink * sink);
+static void gst_auto_audio_sink_detect (GstAutoAudioSink * sink, gboolean fake);
+static GstElementStateReturn
+gst_auto_audio_sink_change_state (GstElement * element);
+
+static GstBinClass *parent_class = NULL;
+
+GType
+gst_auto_audio_sink_get_type (void)
+{
+  static GType gst_auto_audio_sink_type = 0;
+
+  if (!gst_auto_audio_sink_type) {
+    static const GTypeInfo gst_auto_audio_sink_info = {
+      sizeof (GstAutoAudioSinkClass),
+      (GBaseInitFunc) gst_auto_audio_sink_base_init,
+      NULL,
+      (GClassInitFunc) gst_auto_audio_sink_class_init,
+      NULL,
+      NULL,
+      sizeof (GstAutoAudioSink),
+      0,
+      (GInstanceInitFunc) gst_auto_audio_sink_init,
+    };
+
+    gst_auto_audio_sink_type = g_type_register_static (GST_TYPE_BIN,
+        "GstAutoAudioSink", &gst_auto_audio_sink_info, 0);
+  }
+
+  return gst_auto_audio_sink_type;
+}
+
+static void
+gst_auto_audio_sink_base_init (GstAutoAudioSinkClass * klass)
+{
+  GstElementClass *eklass = GST_ELEMENT_CLASS (klass);
+  GstElementDetails gst_auto_audio_sink_details = {
+    "Auto audio sink",
+    "Sink/Audio",
+    "Audio sink embedding the Auto-settings for audio output",
+    "Ronald Bultje <rbultje@ronald.bitfreak.net>"
+  };
+  GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
+      GST_PAD_SINK,
+      GST_PAD_ALWAYS,
+      GST_STATIC_CAPS_ANY);
+
+  gst_element_class_add_pad_template (eklass,
+      gst_static_pad_template_get (&sink_template));
+  gst_element_class_set_details (eklass, &gst_auto_audio_sink_details);
+}
+
+static void
+gst_auto_audio_sink_class_init (GstAutoAudioSinkClass * klass)
+{
+  GstElementClass *eklass = GST_ELEMENT_CLASS (klass);
+
+  parent_class = g_type_class_ref (GST_TYPE_BIN);
+
+  eklass->change_state = gst_auto_audio_sink_change_state;
+}
+
+static void
+gst_auto_audio_sink_init (GstAutoAudioSink * sink)
+{
+  sink->pad = NULL;
+  sink->kid = NULL;
+  gst_auto_audio_sink_detect (sink, TRUE);
+  sink->init = FALSE;
+}
+
+static gboolean
+gst_auto_audio_sink_factory_filter (GstPluginFeature * feature, gpointer data)
+{
+  guint rank;
+  const gchar *klass;
+
+  /* we only care about element factories */
+  if (!GST_IS_ELEMENT_FACTORY (feature))
+    return FALSE;
+
+  /* audio sinks */
+  klass = gst_element_factory_get_klass (GST_ELEMENT_FACTORY (feature));
+  if (strcmp (klass, "Sink/Audio") != 0)
+    return FALSE;
+
+  /* only select elements with autoplugging rank */
+  rank = gst_plugin_feature_get_rank (feature);
+  if (rank < GST_RANK_MARGINAL)
+    return FALSE;
+
+  return TRUE;
+}
+
+static gint
+gst_auto_audio_sink_compare_ranks (GstPluginFeature * f1, GstPluginFeature * f2)
+{
+  gint diff;
+
+  diff = gst_plugin_feature_get_rank (f2) - gst_plugin_feature_get_rank (f1);
+  if (diff != 0)
+    return diff;
+  return strcmp (gst_plugin_feature_get_name (f2),
+      gst_plugin_feature_get_name (f1));
+}
+
+static GstElement *
+gst_auto_audio_sink_find_best (GstAutoAudioSink * sink)
+{
+  GList *list, *item;
+  GstElement *choice = NULL;
+  gboolean ss = TRUE;
+
+  list = gst_registry_pool_feature_filter (
+      (GstPluginFeatureFilter) gst_auto_audio_sink_factory_filter, FALSE, sink);
+  list = g_list_sort (list, (GCompareFunc) gst_auto_audio_sink_compare_ranks);
+
+  /* FIXME:
+   * - soundservers have no priority yet.
+   * - soundserversinks should only be chosen if already running, or if
+   *    the user explicitely wants this to run... That is not easy.
+   */
+
+  while (1) {
+    GST_LOG ("Trying to find %s", ss ? "soundservers" : "audio devices");
+
+    for (item = list; item != NULL; item = item->next) {
+      GstElementFactory *f = GST_ELEMENT_FACTORY (item->data);
+      GstElement *el;
+
+      if ((el = gst_element_factory_create (f, "actual-sink"))) {
+        gboolean has_p = g_object_class_find_property (G_OBJECT_GET_CLASS (el),
+            "soundserver-running") ? TRUE : FALSE;
+
+        if (ss == has_p) {
+          if (ss) {
+            gboolean r;
+
+            g_object_get (G_OBJECT (el), "soundserver-running", &r, NULL);
+            if (r) {
+              GST_LOG ("%s - soundserver is running",
+                  GST_PLUGIN_FEATURE (f)->name);
+            } else {
+              GST_LOG ("%s - Soundserver is not running",
+                  GST_PLUGIN_FEATURE (f)->name);
+              goto next;
+            }
+          }
+          GST_LOG ("Testing %s", GST_PLUGIN_FEATURE (f)->name);
+          if (gst_element_set_state (el, GST_STATE_READY) == GST_STATE_SUCCESS) {
+            gst_element_set_state (el, GST_STATE_NULL);
+            GST_LOG ("This worked!");
+            choice = el;
+            goto done;
+          }
+        }
+
+      next:
+        gst_object_unref (GST_OBJECT (el));
+      }
+    }
+
+    if (!ss)
+      break;
+    ss = FALSE;
+  }
+
+done:
+  g_list_free (list);
+
+  return choice;
+}
+
+static void
+gst_auto_audio_sink_detect (GstAutoAudioSink * sink, gboolean fake)
+{
+  GstElement *esink;
+  GstPad *peer = NULL;
+
+  /* save ghostpad */
+  if (sink->pad) {
+    gst_object_ref (GST_OBJECT (sink->pad));
+    peer = GST_PAD_PEER (GST_PAD_REALIZE (sink->pad));
+    if (peer)
+      gst_pad_unlink (peer, sink->pad);
+  }
+
+  /* kill old element */
+  if (sink->kid) {
+    GST_DEBUG_OBJECT (sink, "Removing old kid");
+    gst_bin_remove (GST_BIN (sink), sink->kid);
+    sink->kid = NULL;
+  }
+
+  /* find element */
+  GST_DEBUG_OBJECT (sink, "Creating new kid (%ssink)", fake ? "fake" : "audio");
+  if (fake) {
+    esink = gst_element_factory_make ("fakesink", "temporary-sink");
+  } else if (!(esink = gst_auto_audio_sink_find_best (sink))) {
+    GST_ELEMENT_ERROR (sink, LIBRARY, INIT, (NULL),
+        ("Failed to find a supported audio sink"));
+    return;
+  }
+  sink->kid = esink;
+  gst_bin_add (GST_BIN (sink), esink);
+
+  /* attach ghost pad */
+  if (sink->pad) {
+    GST_DEBUG_OBJECT (sink, "Re-doing existing ghostpad");
+    gst_pad_add_ghost_pad (gst_element_get_pad (sink->kid, "sink"), sink->pad);
+    if (GST_ELEMENT (sink)->pads == NULL)
+      gst_element_add_pad (GST_ELEMENT (sink), sink->pad);
+  } else {
+    GST_DEBUG_OBJECT (sink, "Creating new ghostpad");
+    sink->pad = gst_ghost_pad_new ("sink",
+        gst_element_get_pad (sink->kid, "sink"));
+    gst_element_add_pad (GST_ELEMENT (sink), sink->pad);
+  }
+  if (peer) {
+    GST_DEBUG_OBJECT (sink, "Linking...");
+    gst_pad_link (peer, sink->pad);
+  }
+
+  GST_DEBUG_OBJECT (sink, "done changing auto audio sink");
+  sink->init = TRUE;
+}
+
+static GstElementStateReturn
+gst_auto_audio_sink_change_state (GstElement * element)
+{
+  GstAutoAudioSink *sink = GST_AUTO_AUDIO_SINK (element);
+
+  if (GST_STATE_TRANSITION (element) == GST_STATE_NULL_TO_READY && !sink->init) {
+    gst_auto_audio_sink_detect (sink, FALSE);
+    if (!sink->init)
+      return GST_STATE_FAILURE;
+  }
+
+  return GST_ELEMENT_CLASS (parent_class)->change_state (element);
+}

gst/autodetect/gstautoaudiosink.h

@@ -0,0 +1,57 @@
+/* GStreamer
+ * (c) 2005 Ronald S. 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.
+ */
+
+#ifndef __GST_AUTO_AUDIO_SINK_H__
+#define __GST_AUTO_AUDIO_SINK_H__
+
+#include <gst/gst.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_AUTO_AUDIO_SINK \
+  (gst_auto_audio_sink_get_type ())
+#define GST_AUTO_AUDIO_SINK(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_AUTO_AUDIO_SINK, \
+			       GstAutoAudioSink))
+#define GST_AUTO_AUDIO_SINK_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_AUTO_AUDIO_SINK, \
+			    GstAutoAudioSink))
+#define GST_IS_AUTO_AUDIO_SINK(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_AUTO_AUDIO_SINK))
+#define GST_IS_AUTO_AUDIO_SINK_CLASS(obj) \
+  (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_AUTO_AUDIO_SINK))
+
+typedef struct _GstAutoAudioSink {
+  GstBin parent;
+
+  /* explicit pointers to stuff used */
+  GstPad *pad;
+  GstElement *kid;
+  gboolean init;
+} GstAutoAudioSink;
+
+typedef struct _GstAutoAudioSinkClass {
+  GstBinClass parent_class;
+} GstAutoAudioSinkClass;
+
+GType	gst_auto_audio_sink_get_type	(void);
+
+G_END_DECLS
+
+#endif /* __GST_AUTO_AUDIO_SINK_H__ */

gst/autodetect/gstautodetect.c

@@ -0,0 +1,48 @@
+/* GStreamer
+ * (c) 2005 Ronald S. 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 <gst/gst.h>
+
+#include "gstautodetect.h"
+#include "gstautoaudiosink.h"
+#include "gstautovideosink.h"
+
+GST_DEBUG_CATEGORY (autodetect_debug);
+
+static gboolean
+plugin_init (GstPlugin * plugin)
+{
+  GST_DEBUG_CATEGORY_INIT (autodetect_debug, "autodetect", 0,
+      "Autodetection audio/video output wrapper elements");
+
+  return gst_element_register (plugin, "autovideosink",
+      GST_RANK_NONE, GST_TYPE_AUTO_VIDEO_SINK) &&
+      gst_element_register (plugin, "autoaudiosink",
+      GST_RANK_NONE, GST_TYPE_AUTO_AUDIO_SINK);
+}
+
+GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
+    GST_VERSION_MINOR,
+    "autodetect",
+    "Plugin contains auto-detection plugins for video/audio outputs",
+    plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)

gst/autodetect/gstautodetect.h

@@ -0,0 +1,26 @@
+/* GStreamer
+ * (c) 2005 Ronald S. 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.
+ */
+
+#ifndef __GST_AUTO_DETECT_H__
+#define __GST_AUTO_DETECT_H__
+
+GST_DEBUG_CATEGORY_EXTERN (autodetect_debug);
+#define GST_CAT_DEFAULT autodetect_debug
+
+#endif /* __GST_AUTO_DETECT_H__ */

gst/autodetect/gstautovideosink.c

@@ -0,0 +1,228 @@
+/* GStreamer
+ * (c) 2005 Ronald S. 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 <string.h>
+
+#include "gstautovideosink.h"
+#include "gstautodetect.h"
+
+static void gst_auto_video_sink_base_init (GstAutoVideoSinkClass * klass);
+static void gst_auto_video_sink_class_init (GstAutoVideoSinkClass * klass);
+static void gst_auto_video_sink_init (GstAutoVideoSink * sink);
+static void gst_auto_video_sink_detect (GstAutoVideoSink * sink, gboolean fake);
+static GstElementStateReturn
+gst_auto_video_sink_change_state (GstElement * element);
+
+static GstBinClass *parent_class = NULL;
+
+GType
+gst_auto_video_sink_get_type (void)
+{
+  static GType gst_auto_video_sink_type = 0;
+
+  if (!gst_auto_video_sink_type) {
+    static const GTypeInfo gst_auto_video_sink_info = {
+      sizeof (GstAutoVideoSinkClass),
+      (GBaseInitFunc) gst_auto_video_sink_base_init,
+      NULL,
+      (GClassInitFunc) gst_auto_video_sink_class_init,
+      NULL,
+      NULL,
+      sizeof (GstAutoVideoSink),
+      0,
+      (GInstanceInitFunc) gst_auto_video_sink_init,
+    };
+
+    gst_auto_video_sink_type = g_type_register_static (GST_TYPE_BIN,
+        "GstAutoVideoSink", &gst_auto_video_sink_info, 0);
+  }
+
+  return gst_auto_video_sink_type;
+}
+
+static void
+gst_auto_video_sink_base_init (GstAutoVideoSinkClass * klass)
+{
+  GstElementClass *eklass = GST_ELEMENT_CLASS (klass);
+  GstElementDetails gst_auto_video_sink_details = {
+    "Auto video sink",
+    "Sink/Video",
+    "Video sink embedding the Auto-settings for video output",
+    "Ronald Bultje <rbultje@ronald.bitfreak.net>"
+  };
+  GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
+      GST_PAD_SINK,
+      GST_PAD_ALWAYS,
+      GST_STATIC_CAPS_ANY);
+
+  gst_element_class_add_pad_template (eklass,
+      gst_static_pad_template_get (&sink_template));
+  gst_element_class_set_details (eklass, &gst_auto_video_sink_details);
+}
+
+static void
+gst_auto_video_sink_class_init (GstAutoVideoSinkClass * klass)
+{
+  GstElementClass *eklass = GST_ELEMENT_CLASS (klass);
+
+  parent_class = g_type_class_ref (GST_TYPE_BIN);
+
+  eklass->change_state = gst_auto_video_sink_change_state;
+}
+
+static void
+gst_auto_video_sink_init (GstAutoVideoSink * sink)
+{
+  sink->pad = NULL;
+  sink->kid = NULL;
+  gst_auto_video_sink_detect (sink, TRUE);
+  sink->init = FALSE;
+}
+
+static gboolean
+gst_auto_video_sink_factory_filter (GstPluginFeature * feature, gpointer data)
+{
+  guint rank;
+  const gchar *klass;
+
+  /* we only care about element factories */
+  if (!GST_IS_ELEMENT_FACTORY (feature))
+    return FALSE;
+
+  /* video sinks */
+  klass = gst_element_factory_get_klass (GST_ELEMENT_FACTORY (feature));
+  if (strcmp (klass, "Sink/Video") != 0)
+    return FALSE;
+
+  /* only select elements with autoplugging rank */
+  rank = gst_plugin_feature_get_rank (feature);
+  if (rank < GST_RANK_MARGINAL)
+    return FALSE;
+
+  return TRUE;
+}
+
+static gint
+gst_auto_video_sink_compare_ranks (GstPluginFeature * f1, GstPluginFeature * f2)
+{
+  gint diff;
+
+  diff = gst_plugin_feature_get_rank (f2) - gst_plugin_feature_get_rank (f1);
+  if (diff != 0)
+    return diff;
+  return strcmp (gst_plugin_feature_get_name (f2),
+      gst_plugin_feature_get_name (f1));
+}
+
+static GstElement *
+gst_auto_video_sink_find_best (GstAutoVideoSink * sink)
+{
+  GList *list;
+
+  list = gst_registry_pool_feature_filter (
+      (GstPluginFeatureFilter) gst_auto_video_sink_factory_filter, FALSE, sink);
+  list = g_list_sort (list, (GCompareFunc) gst_auto_video_sink_compare_ranks);
+
+  for (; list != NULL; list = list->next) {
+    GstElementFactory *f = GST_ELEMENT_FACTORY (list->data);
+    GstElement *el;
+
+    if ((el = gst_element_factory_create (f, "actual-sink"))) {
+      if (gst_element_set_state (el, GST_STATE_READY) == GST_STATE_SUCCESS) {
+        gst_element_set_state (el, GST_STATE_NULL);
+        return el;
+      }
+
+      gst_object_unref (GST_OBJECT (el));
+    }
+  }
+
+  return NULL;
+}
+
+static void
+gst_auto_video_sink_detect (GstAutoVideoSink * sink, gboolean fake)
+{
+  GstElement *esink;
+  GstPad *peer = NULL;
+
+  /* save ghostpad */
+  if (sink->pad) {
+    gst_object_ref (GST_OBJECT (sink->pad));
+    peer = GST_PAD_PEER (GST_PAD_REALIZE (sink->pad));
+    if (peer)
+      gst_pad_unlink (peer, sink->pad);
+  }
+
+  /* kill old element */
+  if (sink->kid) {
+    GST_DEBUG_OBJECT (sink, "Removing old kid");
+    gst_bin_remove (GST_BIN (sink), sink->kid);
+    sink->kid = NULL;
+  }
+
+  /* find element */
+  GST_DEBUG_OBJECT (sink, "Creating new kid (%ssink)", fake ? "fake" : "video");
+  if (fake) {
+    esink = gst_element_factory_make ("fakesink", "temporary-sink");
+    g_return_if_fail (esink);
+  } else if (!(esink = gst_auto_video_sink_find_best (sink))) {
+    GST_ELEMENT_ERROR (sink, LIBRARY, INIT, (NULL),
+        ("Failed to find a supported video sink"));
+    return;
+  }
+  sink->kid = esink;
+  gst_bin_add (GST_BIN (sink), esink);
+
+  /* attach ghost pad */
+  if (sink->pad) {
+    GST_DEBUG_OBJECT (sink, "Re-doing existing ghostpad");
+    gst_pad_add_ghost_pad (gst_element_get_pad (sink->kid, "sink"), sink->pad);
+  } else {
+    GST_DEBUG_OBJECT (sink, "Creating new ghostpad");
+    sink->pad = gst_ghost_pad_new ("sink",
+        gst_element_get_pad (sink->kid, "sink"));
+    gst_element_add_pad (GST_ELEMENT (sink), sink->pad);
+  }
+  if (peer) {
+    GST_DEBUG_OBJECT (sink, "Linking...");
+    gst_pad_link (peer, sink->pad);
+  }
+
+  GST_DEBUG_OBJECT (sink, "done changing auto video sink");
+  sink->init = TRUE;
+}
+
+static GstElementStateReturn
+gst_auto_video_sink_change_state (GstElement * element)
+{
+  GstAutoVideoSink *sink = GST_AUTO_VIDEO_SINK (element);
+
+  if (GST_STATE_TRANSITION (element) == GST_STATE_NULL_TO_READY && !sink->init) {
+    gst_auto_video_sink_detect (sink, FALSE);
+    if (!sink->init)
+      return GST_STATE_FAILURE;
+  }
+
+  return GST_ELEMENT_CLASS (parent_class)->change_state (element);
+}

gst/autodetect/gstautovideosink.h

@@ -0,0 +1,57 @@
+/* GStreamer
+ * (c) 2005 Ronald S. 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.
+ */
+
+#ifndef __GST_AUTO_VIDEO_SINK_H__
+#define __GST_AUTO_VIDEO_SINK_H__
+
+#include <gst/gst.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_AUTO_VIDEO_SINK \
+  (gst_auto_video_sink_get_type ())
+#define GST_AUTO_VIDEO_SINK(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_AUTO_VIDEO_SINK, \
+			       GstAutoVideoSink))
+#define GST_AUTO_VIDEO_SINK_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_AUTO_VIDEO_SINK, \
+			    GstAutoVideoSink))
+#define GST_IS_AUTO_VIDEO_SINK(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_AUTO_VIDEO_SINK))
+#define GST_IS_AUTO_VIDEO_SINK_CLASS(obj) \
+  (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_AUTO_VIDEO_SINK))
+
+typedef struct _GstAutoVideoSink {
+  GstBin parent;
+
+  /* explicit pointers to stuff used */
+  GstPad *pad;
+  GstElement *kid;
+  gboolean init;
+} GstAutoVideoSink;
+
+typedef struct _GstAutoVideoSinkClass {
+  GstBinClass parent_class;
+} GstAutoVideoSinkClass;
+
+GType	gst_auto_video_sink_get_type	(void);
+
+G_END_DECLS
+
+#endif /* __GST_AUTO_VIDEO_SINK_H__ */