Initial revision

Original commit message from CVS:
Initial revision

1 files changed, 285 insertions, 0 deletions

diff --git a/gst/level/gstlevel.c b/gst/level/gstlevel.c
new file mode 100644
index 00000000..cd839a32
--- /dev/null
+++ b/gst/level/gstlevel.c
@@ -0,0 +1,285 @@
+/* Gnome-Streamer
+ * Copyright (C) <1999> 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 <gst/gst.h>
+#include "gstlevel.h"
+#include "math.h"
+
+
+static GstElementDetails level_details = {
+  "Level",
+  "Filter/Effect",
+  "RMS Level indicator for audio/raw",
+  VERSION,
+  "Thomas <thomas@apestaart.org>",
+  "(C) 2001",
+};
+
+
+/* Filter signals and args */
+enum {
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum {
+  ARG_0
+};
+
+static GstPadTemplate*
+level_src_factory (void)
+{
+  static GstPadTemplate *template = NULL;
+
+  if (!template) {
+    template = gst_padtemplate_new (
+      "src",
+      GST_PAD_SRC,
+      GST_PAD_ALWAYS,
+      gst_caps_new (
+        "test_src",
+        "audio/raw",
+	gst_props_new (
+          "channels", GST_PROPS_INT_RANGE (1, 2),
+	  NULL)),
+      NULL);
+  }
+  return template;
+}
+
+static GstPadTemplate*
+level_sink_factory (void)
+{
+  static GstPadTemplate *template = NULL;
+
+  if (!template) {
+    template = gst_padtemplate_new (
+      "sink",
+      GST_PAD_SINK,
+      GST_PAD_ALWAYS,
+      gst_caps_new (
+        "test_src",
+        "audio/raw",
+	gst_props_new (
+          "channels", GST_PROPS_INT_RANGE (1, 2),
+	  NULL)),
+      NULL);
+  }
+  return template;
+}
+
+static void		gst_level_class_init		(GstLevelClass *klass);
+static void		gst_level_init			(GstLevel *filter);
+
+static void		gst_level_set_property			(GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
+static void		gst_level_get_property			(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
+
+static void		gst_level_chain			(GstPad *pad, GstBuffer *buf);
+static void inline 	gst_level_fast_16bit_chain 	(gint16* data, gint16** out_data, 
+			         				 guint numsamples);
+static void inline 	gst_level_fast_8bit_chain		(gint8* data, gint8** out_data,
+                                				 guint numsamples);
+
+static GstElementClass *parent_class = NULL;
+//static guint gst_filter_signals[LAST_SIGNAL] = { 0 };
+
+static GstPadNegotiateReturn
+level_negotiate_src (GstPad *pad, GstCaps **caps, gpointer *data)
+{
+  GstLevel* filter = GST_LEVEL (gst_pad_get_parent (pad));
+  
+  if (*caps==NULL) 
+    return GST_PAD_NEGOTIATE_FAIL;
+  
+  return gst_pad_negotiate_proxy(pad,filter->sinkpad,caps);
+}
+
+static GstPadNegotiateReturn
+level_negotiate_sink (GstPad *pad, GstCaps **caps, gpointer *data)
+{
+  GstLevel* filter = GST_LEVEL (gst_pad_get_parent (pad));
+  
+  if (*caps==NULL) 
+    return GST_PAD_NEGOTIATE_FAIL;
+  
+  return gst_pad_negotiate_proxy(pad,filter->srcpad,caps);
+}		
+
+GType
+gst_level_get_type(void) {
+  static GType level_type = 0;
+
+  if (!level_type) {
+    static const GTypeInfo level_info = {
+      sizeof(GstLevelClass),      NULL,
+      NULL,
+      (GClassInitFunc)gst_level_class_init,
+      NULL,
+      NULL,
+      sizeof(GstLevel),
+      0,
+      (GInstanceInitFunc)gst_level_init,
+    };
+    level_type = g_type_register_static(GST_TYPE_ELEMENT, "GstLevel", &level_info, 0);
+  }
+  return level_type;
+}
+
+static void
+gst_level_class_init (GstLevelClass *klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = (GObjectClass*)klass;
+  gstelement_class = (GstElementClass*)klass;
+
+  parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
+
+  gobject_class->set_property = gst_level_set_property;
+  gobject_class->get_property = gst_level_get_property;
+}
+
+static void
+gst_level_init (GstLevel *filter)
+{
+  filter->sinkpad = gst_pad_new_from_template(level_sink_factory (),"sink");
+  filter->srcpad = gst_pad_new_from_template(level_src_factory (),"src");
+
+  gst_pad_set_negotiate_function(filter->sinkpad,level_negotiate_sink);
+  gst_pad_set_negotiate_function(filter->srcpad,level_negotiate_src);
+
+  gst_element_add_pad(GST_ELEMENT(filter),filter->sinkpad);
+  gst_pad_set_chain_function(filter->sinkpad,gst_level_chain);
+  filter->srcpad = gst_pad_new("src",GST_PAD_SRC);
+  gst_element_add_pad(GST_ELEMENT(filter),filter->srcpad);
+}
+
+static void
+gst_level_chain (GstPad *pad,GstBuffer *buf)
+{
+  GstLevel *filter;
+  gint16 *in_data;
+  gint16 *out_data;
+  GstBuffer* outbuf;
+  gint width;
+
+  GstCaps *caps;
+
+  g_return_if_fail(pad != NULL);
+  g_return_if_fail(GST_IS_PAD(pad));
+  g_return_if_fail(buf != NULL);
+
+  filter = GST_LEVEL(GST_OBJECT_PARENT (pad));
+  g_return_if_fail(filter != NULL);
+  g_return_if_fail(GST_IS_LEVEL(filter));
+
+  caps = NULL;
+  caps = GST_PAD_CAPS(pad);
+  if (caps == NULL)
+  {
+    // FIXME : Please change this to a better warning method !
+    printf ("WARNING : chain : Could not get caps of pad !\n");
+  }
+
+  width = gst_caps_get_int(caps, "width");
+
+  in_data = (gint16 *)GST_BUFFER_DATA(buf);
+  outbuf=gst_buffer_new();
+  GST_BUFFER_DATA(outbuf) = (gchar*)g_new(gint16,GST_BUFFER_SIZE(buf)/2);
+  GST_BUFFER_SIZE(outbuf) = GST_BUFFER_SIZE(buf);
+
+  out_data = (gint16*)GST_BUFFER_DATA(outbuf);
+  
+  switch (width) {
+    case 16:
+	gst_level_fast_16bit_chain(in_data,&out_data,GST_BUFFER_SIZE(buf)/2);
+	break;
+    case 8:
+	gst_level_fast_8bit_chain((gint8*)in_data,(gint8**)&out_data,GST_BUFFER_SIZE(buf));
+	break;
+  }
+  gst_buffer_unref(buf);
+  gst_pad_push(filter->srcpad,outbuf);
+}
+
+static void inline
+gst_level_fast_16bit_chain(gint16* in_data, gint16** out_data, 
+			         guint num_samples)
+#include "filter.func"
+
+static void inline
+gst_level_fast_8bit_chain(gint8* in_data, gint8** out_data,
+                                guint num_samples)
+#include "filter.func"
+
+static void
+gst_level_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
+{
+  GstLevel *filter;
+
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail(GST_IS_LEVEL(object));
+  filter = GST_LEVEL(object);
+
+  switch (prop_id) {
+    default:
+      break;
+  }
+}
+
+static void
+gst_level_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
+{
+  GstLevel *filter;
+
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail(GST_IS_LEVEL(object));
+  filter = GST_LEVEL(object);
+
+  switch (prop_id) {
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static gboolean
+plugin_init (GModule *module, GstPlugin *plugin)
+{
+  GstElementFactory *factory;
+
+  factory = gst_elementfactory_new("level",GST_TYPE_LEVEL,
+                                   &level_details);
+  g_return_val_if_fail(factory != NULL, FALSE);
+  
+  gst_elementfactory_add_padtemplate (factory, level_src_factory ());
+  gst_elementfactory_add_padtemplate (factory, level_sink_factory ());
+
+  gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
+
+  return TRUE;
+}
+
+GstPluginDesc plugin_desc = {
+  GST_VERSION_MAJOR,
+  GST_VERSION_MINOR,
+  "level",
+  plugin_init
+};