camerabin2: viewfinderbin: Adds viewfinderbin element

Adds viewfinder bin element, one of the modules of camerabin2
that is responsible for displaying the video from the camera.

For now it is only a bin with ffmpegcolorspace ! videoscale !
 autovideosink

configure.ac

@@ -293,6 +293,7 @@ AG_GST_CHECK_PLUGIN(audioparsers)
 AG_GST_CHECK_PLUGIN(autoconvert)
 AG_GST_CHECK_PLUGIN(bayer)
 AG_GST_CHECK_PLUGIN(camerabin)
+AG_GST_CHECK_PLUGIN(camerabin2)
 AG_GST_CHECK_PLUGIN(cdxaparse)
 AG_GST_CHECK_PLUGIN(coloreffects)
 AG_GST_CHECK_PLUGIN(colorspace)
@@ -1719,6 +1720,7 @@ gst/audioparsers/Makefile
 gst/autoconvert/Makefile
 gst/bayer/Makefile
 gst/camerabin/Makefile
+gst/camerabin2/Makefile
 gst/cdxaparse/Makefile
 gst/colorspace/Makefile
 gst/coloreffects/Makefile

gst/camerabin2/Makefile.am

@@ -0,0 +1,15 @@
+plugin_LTLIBRARIES = libgstcamerabin2.la
+
+libgstcamerabin2_la_SOURCES = gstviewfinderbin.c
+
+libgstcamerabin2_la_CFLAGS = \
+	$(GST_PLUGINS_BAD_CFLAGS) \
+	$(GST_CFLAGS) $(GST_BASE_CFLAGS) $(GST_PLUGINS_BASE_CFLAGS)
+
+libgstcamerabin2_la_LIBADD = \
+	$(GST_LIBS) $(GST_BASE_LIBS) $(GST_PLUGINS_BASE_LIBS)
+
+libgstcamerabin2_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
+libgstcamerabin2_la_LIBTOOLFLAGS = --tag=disable-static
+
+noinst_HEADERS = gstviewfinderbin.h

gst/camerabin2/gstviewfinderbin.c

@@ -0,0 +1,180 @@
+/* GStreamer
+ * Copyright (C) 2010 Thiago Santos <thiago.sousa.santos@collabora.co.uk>
+ *
+ * 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.
+ */
+/**
+ * SECTION:element-gstviewfinderbin
+ *
+ * The gstviewfinderbin element does FIXME stuff.
+ *
+ * <refsect2>
+ * <title>Example launch line</title>
+ * |[
+ * gst-launch -v videotestsrc ! viewfinderbin
+ * ]|
+ * FIXME Describe what the pipeline does.
+ * </refsect2>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "gstviewfinderbin.h"
+
+/* prototypes */
+
+
+enum
+{
+  PROP_0
+};
+
+/* pad templates */
+
+static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
+    GST_PAD_SINK,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("video/x-raw-yuv; video/x-raw-rgb")
+    );
+
+/* class initialization */
+
+GST_BOILERPLATE (GstViewfinderBin, gst_viewfinder_bin, GstBin, GST_TYPE_BIN);
+
+/* Element class functions */
+static GstStateChangeReturn
+gst_viewfinder_bin_change_state (GstElement * element, GstStateChange trans);
+
+static void
+gst_viewfinder_bin_base_init (gpointer g_class)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
+
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&sink_template));
+
+  gst_element_class_set_details_simple (element_class, "Viewfinder Bin",
+      "Sink/Video", "Viewfinder Bin used in camerabin2",
+      "Thiago Santos <thiago.sousa.santos@collabora.co.uk>");
+}
+
+static void
+gst_viewfinder_bin_class_init (GstViewfinderBinClass * klass)
+{
+  GstElementClass *element_class;
+
+  element_class = GST_ELEMENT_CLASS (klass);
+
+  element_class->change_state =
+      GST_DEBUG_FUNCPTR (gst_viewfinder_bin_change_state);
+}
+
+static void
+gst_viewfinder_bin_init (GstViewfinderBin * viewfinderbin,
+    GstViewfinderBinClass * viewfinderbin_class)
+{
+  viewfinderbin->ghostpad = gst_ghost_pad_new_no_target_from_template ("sink",
+      gst_static_pad_template_get (&sink_template));
+  gst_element_add_pad (GST_ELEMENT_CAST (viewfinderbin),
+      viewfinderbin->ghostpad);
+}
+
+static gboolean
+gst_viewfinder_bin_create_elements (GstViewfinderBin * vfbin)
+{
+  GstElement *csp;
+  GstElement *videoscale;
+  GstElement *sink;
+  GstPad *pad = NULL;
+
+  if (vfbin->elements_created)
+    return TRUE;
+
+  /* create elements */
+  csp = gst_element_factory_make ("ffmpegcolorspace", "vfbin-csp");
+  if (!csp)
+    goto error;
+
+  videoscale = gst_element_factory_make ("videoscale", "vfbin-videoscale");
+  if (!videoscale)
+    goto error;
+
+  sink = gst_element_factory_make ("autovideosink", "vfbin-sink");
+  if (!sink)
+    goto error;
+
+  /* add and link */
+  gst_bin_add_many (GST_BIN_CAST (vfbin), csp, videoscale, sink, NULL);
+  if (!gst_element_link_many (csp, videoscale, sink, NULL))
+    goto error;
+
+  /* add ghostpad */
+  pad = gst_element_get_static_pad (csp, "sink");
+  if (!gst_ghost_pad_set_target (GST_GHOST_PAD (vfbin->ghostpad), pad))
+    goto error;
+
+  vfbin->elements_created = TRUE;
+  return TRUE;
+
+error:
+  if (pad)
+    gst_object_unref (pad);
+  return FALSE;
+}
+
+static GstStateChangeReturn
+gst_viewfinder_bin_change_state (GstElement * element, GstStateChange trans)
+{
+  GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
+  GstViewfinderBin *vfbin = GST_VIEWFINDER_BIN_CAST (element);
+
+  switch (trans) {
+    case GST_STATE_CHANGE_NULL_TO_READY:
+      if (!gst_viewfinder_bin_create_elements (vfbin)) {
+        return GST_STATE_CHANGE_FAILURE;
+      }
+      break;
+    default:
+      break;
+  }
+
+  ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, trans);
+
+  switch (trans) {
+    case GST_STATE_CHANGE_READY_TO_NULL:
+      break;
+    default:
+      break;
+  }
+
+  return ret;
+}
+
+static gboolean
+plugin_init (GstPlugin * plugin)
+{
+  gst_element_register (plugin, "viewfinderbin", GST_RANK_NONE,
+      gst_viewfinder_bin_get_type ());
+
+  return TRUE;
+}
+
+GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
+    GST_VERSION_MINOR,
+    "viewfinderbin", "viewfinder bin of camerabin2",
+    plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)

gst/camerabin2/gstviewfinderbin.h

@@ -0,0 +1,54 @@
+/* GStreamer
+ * Copyright (C) 2010 Thiago Santos <thiago.sousa.santos@collabora.co.uk>
+ *
+ * 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_VIEWFINDER_BIN_H_
+#define _GST_VIEWFINDER_BIN_H_
+
+#include <gst/gst.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_VIEWFINDER_BIN   (gst_viewfinder_bin_get_type())
+#define GST_VIEWFINDER_BIN(obj)   (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_VIEWFINDER_BIN,GstViewfinderBin))
+#define GST_VIEWFINDER_BIN_CAST(obj)   ((GstViewfinderBin *) obj)
+#define GST_VIEWFINDER_BIN_CLASS(klass)   (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_VIEWFINDER_BIN,GstViewfinderBinClass))
+#define GST_IS_VIEWFINDER_BIN(obj)   (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_VIEWFINDER_BIN))
+#define GST_IS_VIEWFINDER_BIN_CLASS(obj)   (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_VIEWFINDER_BIN))
+
+typedef struct _GstViewfinderBin GstViewfinderBin;
+typedef struct _GstViewfinderBinClass GstViewfinderBinClass;
+
+struct _GstViewfinderBin
+{
+  GstBin bin;
+
+  GstPad *ghostpad;
+
+  gboolean elements_created;
+};
+
+struct _GstViewfinderBinClass
+{
+  GstBinClass bin_class;
+};
+
+GType gst_viewfinder_bin_get_type (void);
+
+G_END_DECLS
+
+#endif