template code plugins don't work yet, I messed something up and I'm still looking for it

Original commit message from CVS:
template code
plugins don't work yet, I messed something up and I'm still looking for it

1 files changed, 262 insertions, 0 deletions

diff --git a/gst-plugin/src/gstplugin.c b/gst-plugin/src/gstplugin.c
new file mode 100644
index 0000000..934911c
--- /dev/null
+++ b/gst-plugin/src/gstplugin.c
@@ -0,0 +1,262 @@
+/* 
+ * 
+ * GStreamer
+ * Copyright (C) 1999-2001 Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * 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.
+ */
+
+#include <string.h>
+#include <gst/gst.h>
+#include <gst/audio/audio.h>
+#include <gst/control/control.h>
+#include "gstplugin.h"
+
+
+
+static GstElementDetails plugin_details = {
+  "Plugin",
+  "Generic/Plugin",
+  "Generic Template Plugin",
+  VERSION,
+  "Thomas Vander Stichele <thomas@apestaart.org>",
+  "(C) 2002"
+};
+
+
+/* Filter signals and args */
+enum {
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum {
+  ARG_0,
+  ARG_SILENT,
+};
+
+GST_PAD_TEMPLATE_FACTORY (plugin_sink_factory,
+  "sink",
+  GST_PAD_SINK,
+  GST_PAD_ALWAYS,
+  NULL		/* no caps */
+);
+
+GST_PAD_TEMPLATE_FACTORY (plugin_src_factory,
+  "src",
+  GST_PAD_SRC,
+  GST_PAD_ALWAYS,
+  NULL		/* no caps */
+);
+
+static void	plugin_class_init	(GstPluginClass *klass);
+static void	plugin_init		(GstPlugin *filter);
+
+static void	plugin_set_property	(GObject *object, guint prop_id, 
+                                         const GValue *value, 
+					 GParamSpec *pspec);
+static void	plugin_get_property     (GObject *object, guint prop_id, 
+                                         GValue *value, GParamSpec *pspec);
+
+static void	plugin_update_plugin    (const GValue *value, gpointer data);
+static void	plugin_update_mute      (const GValue *value, gpointer data);
+
+static void	plugin_chain	(GstPad *pad, GstBuffer *buf);
+
+static GstElementClass *parent_class = NULL;
+
+/* this function handles the connection with other plug-ins */
+static GstPadConnectReturn
+plugin_connect (GstPad *pad, GstCaps *caps)
+{
+  GstPlugin *filter;
+  GstPad *otherpad;
+  
+  filter = GST_PLUGIN (gst_pad_get_parent (pad));
+  g_return_val_if_fail (filter != NULL, GST_PAD_CONNECT_REFUSED);
+  g_return_val_if_fail (GST_IS_PLUGIN (filter), GST_PAD_CONNECT_REFUSED);
+  otherpad = (pad == filter->srcpad ? filter->sinkpad : filter->srcpad);
+  
+  if (GST_CAPS_IS_FIXED (caps)) 
+  {
+    /* caps are not fixed, so try to connect on the other side and see if
+     * that works */
+
+    if (!gst_pad_try_set_caps (otherpad, caps))
+      return GST_PAD_CONNECT_REFUSED;
+
+    /* caps on other side were accepted, so we're ok */
+    return GST_PAD_CONNECT_OK;
+  }
+  /* not enough information yet, delay negotation */ 
+  return GST_PAD_CONNECT_DELAYED;
+}
+
+GType
+gst_plugin_get_type (void) 
+{
+  static GType plugin_type = 0;
+
+  if (!plugin_type) 
+  {
+    static const GTypeInfo plugin_info = 
+    {
+      sizeof (GstPluginClass),
+      NULL,
+      NULL,
+      (GClassInitFunc) plugin_class_init,
+      NULL,
+      NULL,
+      sizeof (GstPlugin),
+      0,
+      (GInstanceInitFunc) plugin_init,
+    };
+    plugin_type = g_type_register_static (GST_TYPE_ELEMENT, "GstPlugin", 
+	                                  &plugin_info, 0);
+  }
+  return plugin_type;
+}
+
+static void
+plugin_class_init (GstPluginClass *klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = (GObjectClass*) klass;
+  gstelement_class = (GstElementClass*) klass;
+
+  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_MUTE,
+    g_param_spec_boolean ("silent", "silent", "silent",
+                          FALSE, G_PARAM_READWRITE));
+  
+  gobject_class->set_property = plugin_set_property;
+  gobject_class->get_property = plugin_get_property;
+}
+
+/* initialize the new plug-in
+ * instantiate pads and add them to plug-in
+ * set functions
+ * initialize structure
+ */
+static void
+plugin_init (GstPlugin *filter)
+{
+  filter->sinkpad = gst_pad_new_from_template (plugin_sink_factory (), "sink");
+  gst_pad_set_connect_function (filter->sinkpad, plugin_connect);
+  filter->srcpad = gst_pad_new_from_template (plugin_src_factory (), "src");
+  gst_pad_set_connect_function (filter->srcpad, plugin_connect);
+  
+  gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
+  gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
+  gst_pad_set_chain_function (filter->sinkpad, plugin_chain);
+  filter->silent = FALSE;
+
+}
+
+/* chain function
+ * this function does the actual processing
+ */
+
+static void
+plugin_chain (GstPad *pad, GstBuffer *buf)
+{
+  GstPlugin *filter;
+  GstBuffer *out_buf;
+  gfloat *data;
+  gint i, num_samples;
+
+  g_return_if_fail (GST_IS_PAD (pad));
+  g_return_if_fail (buf != NULL);
+  
+  filter = GST_PLUGIN (GST_OBJECT_PARENT (pad));
+  g_return_if_fail (GST_IS_PLUGIN (filter));
+
+  if (filter->silent == FALSE)
+    g_print ("I'm plugged, therefore I'm in.\n");
+
+  /* just push out the incoming buffer without touching it */
+  gst_pad_push (filter->srcpad, buf);
+}
+
+static void
+plugin_set_property (GObject *object, guint prop_id, 
+                     const GValue *value, GParamSpec *pspec)
+{
+  GstPlugin *filter;
+
+  g_return_if_fail (GST_IS_PLUGIN (object));
+  filter = GST_PLUGIN (object);
+
+  switch (prop_id) 
+  {
+  case ARG_SILENT:
+    filter->silent = g_value_get_boolean (value);
+    break;
+  default:
+    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    break;
+  }
+}
+
+static void
+plugin_get_property (GObject *object, guint prop_id, 
+                     GValue *value, GParamSpec *pspec)
+{
+  GstPlugin *filter;
+
+  g_return_if_fail (GST_IS_PLUGIN (object));
+  filter = GST_PLUGIN (object);
+  
+  switch (prop_id) {
+  case ARG_SILENT:
+    g_value_set_boolean (value, filter->silent);
+  default:
+    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    break;
+  }
+}
+
+/* initialize the plugin
+ * register the element factories and pad templates
+ * register the features 
+ */
+static gboolean
+plugin_init (GModule *module, GstPlugin *plugin)
+{
+  GstElementFactory *factory;
+
+  factory = gst_element_factory_new ("plugin", GST_TYPE_PLUGIN,
+                                     &plugin_details);
+  g_return_val_if_fail (factory != NULL, FALSE);
+  
+  gst_element_factory_add_pad_template (factory, plugin_src_factory ());
+  gst_element_factory_add_pad_template (factory, plugin_sink_factory ());
+
+  gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
+
+  /* plugin initialisation succeeded */
+  return TRUE;
+}
+
+GstPluginDesc plugin_desc = {
+  GST_VERSION_MAJOR,
+  GST_VERSION_MINOR,
+  "plugin",
+  plugin_init
+};