new filter subdir for standard audio filters first filter uses code from vorbis to implement an iir filter not optimi...

Original commit message from CVS:
new filter subdir for standard audio filters
first filter uses code from vorbis to implement an iir filter
not optimized yet, iir code uses doubles and plugin uses float

1 files changed, 120 insertions, 0 deletions

diff --git a/gst/filter/gstfilter.c b/gst/filter/gstfilter.c
new file mode 100644
index 00000000..2ed416c1
--- /dev/null
+++ b/gst/filter/gstfilter.c
@@ -0,0 +1,120 @@
+/* GStreamer
+ * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
+ *                    2000 Wim Taymans <wtay@chello.be>
+ *
+ * gstfilter.c: element for filter plug-ins
+ *
+ * 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 "gstfilter.h"
+
+
+struct _elements_entry {
+  gchar *name;
+  GType (*type) (void);
+  GstElementDetails *details;
+  gboolean (*factoryinit) (GstElementFactory *factory);
+};
+
+static struct _elements_entry _elements[] = {
+  { "iir",  gst_iir_get_type,  &gst_iir_details,  NULL },
+  { NULL, 0 },
+};
+
+GstPadTemplate* 
+gst_filter_src_factory (void)
+{
+  static GstPadTemplate *templ = NULL;
+  if (!templ) {
+    templ = GST_PAD_TEMPLATE_NEW ( 
+  		"src",
+  		GST_PAD_SRC,
+  		GST_PAD_ALWAYS,
+  		GST_CAPS_NEW (
+  		  "filter_src",
+  		  "audio/raw",
+  		    "format",		GST_PROPS_STRING ("float"),
+  		    "rate",            	GST_PROPS_INT_RANGE (1, G_MAXINT),
+		    "layout",     	GST_PROPS_STRING ("gfloat"),
+		    "intercept",  	GST_PROPS_FLOAT(0.0),
+		    "slope",      	GST_PROPS_FLOAT(1.0),
+		    "channels",   	GST_PROPS_INT (1)
+		)
+  	     );
+  }
+  return templ;
+}
+
+GstPadTemplate* 
+gst_filter_sink_factory (void)
+{
+  static GstPadTemplate *templ = NULL;
+  if (!templ) {
+    templ = GST_PAD_TEMPLATE_NEW ( 
+  		"sink",
+  		GST_PAD_SINK,
+  		GST_PAD_ALWAYS,
+  		GST_CAPS_NEW (
+  		  "filter_src",
+  		  "audio/raw",
+  		    "format",		GST_PROPS_STRING ("float"),
+  		    "rate",            	GST_PROPS_INT_RANGE (1, G_MAXINT),
+		    "layout",     	GST_PROPS_STRING ("gfloat"),
+		    "intercept",  	GST_PROPS_FLOAT(0.0),
+		    "slope",      	GST_PROPS_FLOAT(1.0),
+		    "channels",   	GST_PROPS_INT (1)
+		)
+  	     );
+  }
+  return templ;
+}
+
+static gboolean
+plugin_init (GModule * module, GstPlugin * plugin)
+{
+  GstElementFactory *factory;
+  gint i = 0;
+
+  while (_elements[i].name) {
+    factory = gst_element_factory_new (_elements[i].name,
+                                      (_elements[i].type) (),
+                                       _elements[i].details);
+
+    if (!factory) {
+      g_warning ("gst_filter_new failed for `%s'",
+                 _elements[i].name);
+      continue;
+    }
+    gst_element_factory_add_pad_template (factory, gst_filter_src_factory ());
+    gst_element_factory_add_pad_template (factory, gst_filter_sink_factory ());
+
+    gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
+    if (_elements[i].factoryinit) {
+      _elements[i].factoryinit (factory);
+    }
+    i++;
+  }
+
+  return TRUE;
+}
+
+GstPluginDesc plugin_desc = {
+  GST_VERSION_MAJOR,
+  GST_VERSION_MINOR,
+  "filter",
+  plugin_init
+};