added ladspa, doesn't have checks yet though

Original commit message from CVS:
added ladspa, doesn't have checks yet though

1 files changed, 877 insertions, 0 deletions

diff --git a/ext/ladspa/gstladspa.c b/ext/ladspa/gstladspa.c
new file mode 100644
index 00000000..81740c25
--- /dev/null
+++ b/ext/ladspa/gstladspa.c
@@ -0,0 +1,877 @@
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *               <2001> Steve Baker <stevebaker_org@yahoo.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.
+ */
+
+#include <string.h>
+#include <math.h>
+
+//#define DEBUG_ENABLED
+#include "gstladspa.h"
+#include "ladspa.h"
+#include "search.h"
+#include "utils.h"
+
+
+static GstPadTemplate* 
+ladspa_src_factory (void)
+{
+  return 
+    gst_padtemplate_new (
+    "src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    gst_caps_new (
+    "ladspa_src",
+      "audio/raw",
+      gst_props_new (
+        "format",     GST_PROPS_STRING ("float"),
+        "layout",     GST_PROPS_STRING ("gfloat"),
+        "intercept",  GST_PROPS_FLOAT(0.0),
+        "slope",      GST_PROPS_FLOAT(1.0),
+        "channels",   GST_PROPS_INT (1),
+        "rate",       GST_PROPS_INT_RANGE (0,G_MAXINT),
+      NULL)),
+    NULL);
+}
+
+static GstPadTemplate* 
+ladspa_sink_factory (void) 
+{
+  return 
+    gst_padtemplate_new (
+      "sink",
+      GST_PAD_SINK,
+      GST_PAD_ALWAYS,
+      gst_caps_new (
+      "float2int_sink",
+        "audio/raw",
+        gst_props_new (
+          "format",     GST_PROPS_STRING ("float"),
+          "layout",     GST_PROPS_STRING ("gfloat"),
+          "intercept",  GST_PROPS_FLOAT(0.0),
+          "slope",      GST_PROPS_FLOAT(1.0),
+          "channels",   GST_PROPS_INT (1),
+          "rate",       GST_PROPS_INT_RANGE (0,G_MAXINT),
+      NULL)),
+    NULL);
+}
+
+enum {
+  ARG_0,
+  ARG_LOOP_BASED,
+  ARG_SAMPLERATE,
+  ARG_BUFFERSIZE,
+  ARG_LAST,
+};
+
+static GstPadTemplate *srctempl, *sinktempl;
+
+static void			gst_ladspa_class_init		(GstLADSPAClass *klass);
+static void			gst_ladspa_init			(GstLADSPA *ladspa);
+
+static GstPadNegotiateReturn gst_ladspa_negotiate_sink_mono (GstPad *pad, GstCaps **caps, gpointer *data);
+static GstPadNegotiateReturn gst_ladspa_negotiate_src_mono (GstPad *pad, GstCaps **caps, gpointer *data);
+static GstPadNegotiateReturn gst_ladspa_negotiate_src_get_mono (GstPad *pad, GstCaps **caps, gpointer *data);
+static void gst_ladspa_force_caps(GstLADSPA *ladspa, GstPad *pad);
+
+static void			gst_ladspa_set_property		(GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
+static void			gst_ladspa_get_property		(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
+
+static gboolean gst_ladspa_instantiate (GstLADSPA *ladspa);
+static void gst_ladspa_activate(GstLADSPA *ladspa);
+static void gst_ladspa_deactivate(GstLADSPA *ladspa);
+
+static GstElementStateReturn	gst_ladspa_change_state		(GstElement *element);
+static void			gst_ladspa_loop			(GstElement *element);
+static void      gst_ladspa_chain_inplace_mono (GstPad *pad,GstBuffer *buf);
+static GstBuffer * gst_ladspa_get_mono(GstPad *pad);
+static GstBuffer * gst_ladspa_get(GstPad *pad);
+
+static GstElementClass *parent_class = NULL;
+//static guint gst_ladspa_signals[LAST_SIGNAL] = { 0 };
+
+static GstPlugin *ladspa_plugin;
+static GHashTable *ladspa_descriptors;
+
+static void
+gst_ladspa_class_init (GstLADSPAClass *klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+  LADSPA_Descriptor *desc;
+  gint i,current_portnum,sinkcount,srccount,controlcount;
+  gint hintdesc;
+  gint argtype,argperms;
+  GParamSpec *paramspec = NULL;
+  gchar *argname;
+
+  gobject_class = (GObjectClass*)klass;
+  gstelement_class = (GstElementClass*)klass;
+
+  gobject_class->set_property = gst_ladspa_set_property;
+  gobject_class->get_property = gst_ladspa_get_property;
+
+  gstelement_class->change_state = gst_ladspa_change_state;
+
+  g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_LOOP_BASED,
+    g_param_spec_boolean("loop-based","loop-based","loop-based",
+                         FALSE,G_PARAM_READWRITE));
+
+  // look up and store the ladspa descriptor
+  klass->descriptor = g_hash_table_lookup(ladspa_descriptors,GINT_TO_POINTER(G_TYPE_FROM_CLASS(klass)));
+  desc = klass->descriptor;
+
+  klass->numports = desc->PortCount;
+
+  klass->numsinkpads = 0;
+  klass->numsrcpads = 0;
+  klass->numcontrols = 0;
+
+  // walk through the ports, count the input, output and control ports
+  for (i=0;i<desc->PortCount;i++) {
+    if (LADSPA_IS_PORT_AUDIO(desc->PortDescriptors[i]) && 
+        LADSPA_IS_PORT_INPUT(desc->PortDescriptors[i])){
+      klass->numsinkpads++;
+    }
+      
+    if (LADSPA_IS_PORT_AUDIO(desc->PortDescriptors[i]) && 
+        LADSPA_IS_PORT_OUTPUT(desc->PortDescriptors[i])){
+      klass->numsrcpads++;
+    }
+      
+    if (LADSPA_IS_PORT_CONTROL(desc->PortDescriptors[i]) && 
+        LADSPA_IS_PORT_INPUT(desc->PortDescriptors[i])){
+      klass->numcontrols++;
+    }
+  }
+
+  klass->srcpad_portnums = g_new0(gint,klass->numsrcpads);
+  klass->sinkpad_portnums = g_new0(gint,klass->numsinkpads);
+  klass->control_portnums = g_new0(gint,klass->numcontrols);
+  sinkcount = 0;
+  srccount = 0;
+  controlcount = 0;
+
+  // walk through the ports, note the portnums for srcpads, sinkpads and control params
+  for (i=0;i<desc->PortCount;i++) {
+    if (LADSPA_IS_PORT_AUDIO(desc->PortDescriptors[i]) && 
+        LADSPA_IS_PORT_INPUT(desc->PortDescriptors[i])){
+      //g_print("input port %d\n", i);
+      klass->sinkpad_portnums[sinkcount++] = i;
+    }
+      
+    if (LADSPA_IS_PORT_AUDIO(desc->PortDescriptors[i]) && 
+        LADSPA_IS_PORT_OUTPUT(desc->PortDescriptors[i])){
+      //g_print("output port %d\n", i);
+      klass->srcpad_portnums[srccount++] = i;
+    }
+      
+    if (LADSPA_IS_PORT_CONTROL(desc->PortDescriptors[i]) && 
+        LADSPA_IS_PORT_INPUT(desc->PortDescriptors[i])){
+      //g_print("control port %d\n", i);
+      klass->control_portnums[controlcount++] = i;
+    }
+  }
+
+  // no sink pads - we'll use get mode and add params for samplerate and buffersize
+  if (klass->numsinkpads == 0 && klass->numsrcpads > 0){
+    g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_SAMPLERATE,
+      g_param_spec_int("samplerate","samplerate","samplerate",
+                      0,G_MAXINT,44100,G_PARAM_READWRITE));
+    g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_BUFFERSIZE,
+      g_param_spec_int("buffersize","buffersize","buffersize",
+                      0,G_MAXINT,64,G_PARAM_READWRITE));
+
+  }
+  
+  // now build the contorl info from the control ports
+  klass->control_info = g_new0(ladspa_control_info,klass->numcontrols);
+    
+  for (i=0;i<klass->numcontrols;i++) {
+
+    current_portnum = klass->control_portnums[i];
+    
+    // short name for hint descriptor
+    hintdesc = desc->PortRangeHints[current_portnum].HintDescriptor;
+
+    // get the various bits
+    if (LADSPA_IS_HINT_TOGGLED(hintdesc))
+      klass->control_info[i].toggled = TRUE;
+    if (LADSPA_IS_HINT_LOGARITHMIC(hintdesc))
+      klass->control_info[i].logarithmic = TRUE;
+    if (LADSPA_IS_HINT_INTEGER(hintdesc))
+      klass->control_info[i].integer = TRUE;
+
+    // figure out the argument details
+    if (klass->control_info[i].toggled) argtype = G_TYPE_BOOLEAN;
+    else if (klass->control_info[i].integer) argtype = G_TYPE_INT;
+    else argtype = G_TYPE_FLOAT;
+
+    // grab the bounds
+    if (LADSPA_IS_HINT_BOUNDED_BELOW(hintdesc)) {
+      klass->control_info[i].lower = TRUE;
+      klass->control_info[i].lowerbound =
+        desc->PortRangeHints[current_portnum].LowerBound;
+    } else {
+      if (argtype==G_TYPE_INT) klass->control_info[i].lowerbound = (gfloat)G_MININT;
+      if (argtype==G_TYPE_FLOAT) klass->control_info[i].lowerbound = G_MINFLOAT;
+    }
+    
+    if (LADSPA_IS_HINT_BOUNDED_ABOVE(hintdesc)) {
+      klass->control_info[i].upper = TRUE;
+      klass->control_info[i].upperbound =
+        desc->PortRangeHints[current_portnum].UpperBound;
+      if (LADSPA_IS_HINT_SAMPLE_RATE(hintdesc))
+        klass->control_info[i].samplerate = TRUE;
+    } else {
+      if (argtype==G_TYPE_INT) klass->control_info[i].upperbound = (gfloat)G_MAXINT;
+      if (argtype==G_TYPE_FLOAT) klass->control_info[i].upperbound = G_MAXFLOAT;
+    }
+
+    if (LADSPA_IS_PORT_INPUT(desc->PortDescriptors[current_portnum])) {
+      argperms = G_PARAM_READWRITE;
+      klass->control_info[i].writable = TRUE;
+    } else {
+      argperms = G_PARAM_READABLE;
+      klass->control_info[i].writable = FALSE;
+    }
+
+    klass->control_info[i].name = g_strdup(desc->PortNames[current_portnum]);
+    argname = g_strdup(klass->control_info[i].name);
+    // this is the same thing that param_spec_* will do
+    g_strcanon (argname, G_CSET_A_2_Z G_CSET_a_2_z G_CSET_DIGITS "-", '-');
+    
+    // check for duplicate property names
+    if (g_object_class_find_property(G_OBJECT_CLASS(klass), argname) != NULL){
+      gint numarg=1;
+      gchar *numargname = g_strdup_printf("%s_%d",argname,numarg++);
+      while (g_object_class_find_property(G_OBJECT_CLASS(klass), numargname) != NULL){
+        g_free(numargname);
+        numargname = g_strdup_printf("%s_%d",argname,numarg++);
+      }
+      argname = numargname;
+    }
+    
+    if (argtype==G_TYPE_BOOLEAN){
+      paramspec = g_param_spec_boolean(argname,argname,argname, FALSE, argperms);
+    } else if (argtype==G_TYPE_INT){      
+      paramspec = g_param_spec_int(argname,argname,argname, 
+        (gint)klass->control_info[i].lowerbound, (gint)klass->control_info[i].upperbound, 0, argperms);
+    } else {
+      paramspec = g_param_spec_float(argname,argname,argname, 
+        klass->control_info[i].lowerbound, klass->control_info[i].upperbound, 
+        (klass->control_info[i].lowerbound + klass->control_info[i].upperbound) / 2.0f, argperms);
+    }
+    g_object_class_install_property(G_OBJECT_CLASS(klass), i+ARG_LAST, paramspec);
+    
+    g_print("added arg %s from %s\n",argname, klass->control_info[i].name);
+  }
+}
+
+static void
+gst_ladspa_init (GstLADSPA *ladspa)
+{
+  GstLADSPAClass *oclass = (GstLADSPAClass*)(G_OBJECT_GET_CLASS(ladspa));
+  
+  LADSPA_Descriptor *desc;
+  gint i,sinkcount,srccount,controlcount;
+
+  desc = oclass->descriptor;
+  ladspa->descriptor = oclass->descriptor;
+  
+  // allocate the various arrays
+  ladspa->srcpads = g_new0(GstPad*,oclass->numsrcpads);
+  ladspa->sinkpads = g_new0(GstPad*,oclass->numsinkpads);
+  ladspa->controls = g_new(gfloat,oclass->numcontrols);
+
+  // walk through the ports and add all the pads
+  sinkcount = 0;
+  srccount = 0;
+  controlcount = 0;
+  for (i=0;i<desc->PortCount;i++) {
+    if (LADSPA_IS_PORT_AUDIO(desc->PortDescriptors[i]) &&
+        LADSPA_IS_PORT_INPUT(desc->PortDescriptors[i])) {
+      ladspa->sinkpads[sinkcount] = gst_pad_new_from_template 
+      (sinktempl, (gchar *)desc->PortNames[i]);
+      gst_element_add_pad(GST_ELEMENT(ladspa),ladspa->sinkpads[sinkcount]);
+      sinkcount++;
+    }
+    if (LADSPA_IS_PORT_AUDIO(desc->PortDescriptors[i]) &&
+        LADSPA_IS_PORT_OUTPUT(desc->PortDescriptors[i])) {
+      ladspa->srcpads[srccount] = gst_pad_new_from_template 
+        (srctempl, (gchar *)desc->PortNames[i]);
+      gst_element_add_pad(GST_ELEMENT(ladspa),ladspa->srcpads[srccount]);
+      srccount++;
+    }
+    if (LADSPA_IS_PORT_CONTROL(desc->PortDescriptors[i]) &&
+        LADSPA_IS_PORT_INPUT(desc->PortDescriptors[i])) {
+          
+      // use the lowerbound as the default value if it exists
+      if (oclass->control_info[controlcount].lower){
+        ladspa->controls[controlcount]=oclass->control_info[controlcount].lowerbound;
+      } else {
+        ladspa->controls[controlcount] = 0.0;
+      }
+      controlcount++;
+    }
+  }
+
+  ladspa->samplerate = 0;
+  ladspa->buffersize = 0;
+  ladspa->newcaps = FALSE;
+  ladspa->activated = FALSE;
+  
+  // mono chain
+  if (sinkcount==1 && srccount==1){
+    //g_print("inplace mono chain mode\n");
+    gst_pad_set_negotiate_function (ladspa->sinkpads[0], gst_ladspa_negotiate_sink_mono);
+    gst_pad_set_chain_function(ladspa->sinkpads[0],gst_ladspa_chain_inplace_mono);
+    gst_pad_set_negotiate_function (ladspa->srcpads[0], gst_ladspa_negotiate_src_mono);
+  }
+  
+  // mono get (no sink pads)
+  if (sinkcount==0 && srccount == 1){
+    //g_print("get mode\n");
+    ladspa->newcaps = TRUE;
+    ladspa->samplerate = 44100;
+    ladspa->buffersize = 64;
+    gst_pad_set_get_function(ladspa->srcpads[0],gst_ladspa_get_mono);
+    gst_pad_set_negotiate_function (ladspa->srcpads[0], gst_ladspa_negotiate_src_get_mono);
+    gst_ladspa_instantiate(ladspa);
+  }
+  
+  // multi srcpad get
+  if (sinkcount==0 && srccount > 1){
+    //g_print("multi get mode\n");
+    ladspa->newcaps = TRUE;
+    ladspa->samplerate = 44100;
+    ladspa->buffersize = 64;
+    gst_pad_set_get_function(ladspa->srcpads[0],gst_ladspa_get);
+    gst_pad_set_negotiate_function (ladspa->srcpads[0], gst_ladspa_negotiate_src_get_mono);
+    gst_ladspa_instantiate(ladspa);
+    ladspa->buffers = g_new0(GstBuffer*,oclass->numsrcpads);
+  }
+}
+
+static GstPadNegotiateReturn
+gst_ladspa_negotiate_src_mono (GstPad *pad, GstCaps **caps, gpointer *data)
+{
+  GstLADSPA *ladspa = (GstLADSPA*)GST_OBJECT_PARENT (pad);
+  
+  // have to instantiate ladspa plugin when samplerate changes (groan)
+  if (ladspa->samplerate != gst_caps_get_int (*caps, "rate")){
+    ladspa->samplerate = gst_caps_get_int (*caps, "rate");
+    if (!gst_ladspa_instantiate(ladspa)) return GST_PAD_NEGOTIATE_FAIL;
+  }
+  return gst_pad_negotiate_proxy (pad, ladspa->sinkpads[0], caps);
+}
+
+static GstPadNegotiateReturn
+gst_ladspa_negotiate_sink_mono (GstPad *pad, GstCaps **caps, gpointer *data)
+{
+  GstLADSPA *ladspa = (GstLADSPA*)GST_OBJECT_PARENT (pad);
+  
+  // have to instantiate ladspa plugin when samplerate changes (groan)
+  if (ladspa->samplerate != gst_caps_get_int (*caps, "rate")){
+    ladspa->samplerate = gst_caps_get_int (*caps, "rate");
+    if (!gst_ladspa_instantiate(ladspa)) return GST_PAD_NEGOTIATE_FAIL;
+  }
+  return gst_pad_negotiate_proxy (pad, ladspa->srcpads[0], caps);
+}
+
+static GstPadNegotiateReturn 
+gst_ladspa_negotiate_src_get_mono (GstPad *pad, GstCaps **caps, gpointer *data) 
+{
+  GstLADSPA *ladspa;
+  //g_print("gst_ladspa_negotiate_src_get_mono\n");
+  if (*caps) {
+    g_return_val_if_fail (pad != NULL, GST_PAD_NEGOTIATE_FAIL);
+    ladspa = (GstLADSPA*)GST_OBJECT_PARENT (pad);
+    ladspa->samplerate = gst_caps_get_int (*caps, "rate");
+    if (!gst_ladspa_instantiate(ladspa)) return GST_PAD_NEGOTIATE_FAIL;
+    return GST_PAD_NEGOTIATE_AGREE;
+  }
+  return GST_PAD_NEGOTIATE_FAIL;
+}
+
+static void
+gst_ladspa_force_caps(GstLADSPA *ladspa, GstPad *pad) {
+  
+  // g_print("forcing caps\n");
+  gst_pad_set_caps (pad, gst_caps_new (
+    "ladspa_src_caps",
+    "audio/raw",
+    gst_props_new (
+      "format",     GST_PROPS_STRING ("float"),
+      "layout",     GST_PROPS_STRING ("gfloat"),
+      "intercept",  GST_PROPS_FLOAT(0.0),
+      "slope",      GST_PROPS_FLOAT(1.0),
+      "rate",       GST_PROPS_INT (ladspa->samplerate),
+      "channels",   GST_PROPS_INT (1),
+      NULL
+    )
+  ));
+  ladspa->newcaps=FALSE;
+}
+
+static void
+gst_ladspa_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
+{
+  GstLADSPA *ladspa = (GstLADSPA*)object;
+  gint cid = prop_id - ARG_LAST;
+  GstLADSPAClass *oclass;
+  ladspa_control_info *control_info;
+  gfloat val=0.0;
+    
+  // these are only registered in get mode
+  switch (prop_id) {
+    case ARG_SAMPLERATE:
+      ladspa->samplerate = g_value_get_int (value);
+      ladspa->newcaps=TRUE;
+      break;
+    case ARG_BUFFERSIZE:
+      ladspa->buffersize = g_value_get_int (value);
+      break;
+  }
+  
+  // is it a ladspa plugin arg?
+  if (cid<0) return;
+
+/*
+  if (id == ARG_LOOP_BASED) {
+    // we can only do this in NULL state
+    g_return_if_fail (GST_STATE(object) != GST_STATE_NULL);
+    ladspa->loopbased = g_value_get_boolean (value);
+    if (ladspa->loopbased) {
+      gst_element_set_loop_function (GST_ELEMENT (ladspa), gst_ladspa_loop);
+    } else {
+      gst_element_set_loop_function (GST_ELEMENT (ladspa), NULL);
+    }
+  }
+*/
+
+  oclass = (GstLADSPAClass*)(G_OBJECT_GET_CLASS (object));
+
+  // verify it exists and is a control (not a port)
+  g_return_if_fail(cid < oclass->numcontrols);
+  
+  control_info = &(oclass->control_info[cid]);
+  g_return_if_fail (control_info->name != NULL);
+
+  // check to see if it's writable
+  g_return_if_fail (control_info->writable);
+
+  // g_print("set arg %s to %f\n",control_info->name,ladspa->controls[cid]);
+
+  // now see what type it is
+  if (control_info->toggled) {
+    if (g_value_get_boolean (value))
+      ladspa->controls[cid] = 1.0;
+    else
+      ladspa->controls[cid] = 0.0;
+  } else if (control_info->integer) {
+    val = (gfloat)g_value_get_int (value);
+    ladspa->controls[cid] = val;
+  } else {
+    val = g_value_get_float (value);
+    ladspa->controls[cid] = val;
+  }    
+}
+
+static void
+gst_ladspa_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
+{
+  GstLADSPA *ladspa = (GstLADSPA*)object;
+  gint cid = prop_id - ARG_LAST;
+  GstLADSPAClass *oclass = (GstLADSPAClass*)(G_OBJECT_GET_CLASS (object));
+  ladspa_control_info *control_info;
+
+  // these are only registered in get mode
+  switch (prop_id){
+    case ARG_SAMPLERATE:
+      g_value_set_int (value, ladspa->samplerate);
+      break;
+    case ARG_BUFFERSIZE:
+      g_value_set_int (value, ladspa->buffersize);
+      break;
+  }
+    
+  if (cid<0) return;
+  // verify it exists and is a control (not a port)
+  if (cid >= oclass->numcontrols) return;
+  control_info = &(oclass->control_info[cid]);
+  if (control_info->name == NULL) return;
+
+  //g_print("got arg %s as %f\n",control_info->name,ladspa->controls[cid]);
+
+  // now see what type it is
+  if (control_info->toggled) {
+    if (ladspa->controls[cid] == 1.0)
+      g_value_set_boolean (value, TRUE);
+    else
+      g_value_set_boolean (value, FALSE);
+  } else if (control_info->integer) {
+    g_value_set_int (value, (gint)ladspa->controls[cid]);
+  } else {
+    g_value_set_float (value, ladspa->controls[cid]);
+  }
+}
+
+static gboolean
+gst_ladspa_instantiate (GstLADSPA *ladspa)
+{
+  LADSPA_Descriptor *desc;
+  int i;
+  GstLADSPAClass *oclass = (GstLADSPAClass*)(G_OBJECT_GET_CLASS (ladspa));
+  gboolean was_activated;
+  
+  desc = ladspa->descriptor;
+  
+  // check for old handle
+  was_activated = ladspa->activated;
+  if (ladspa->handle != NULL){
+    gst_ladspa_deactivate(ladspa);
+    desc->cleanup(ladspa->handle);
+  }
+        
+  // instantiate the plugin  
+  ladspa->handle = desc->instantiate(desc,ladspa->samplerate);
+  g_return_val_if_fail (ladspa->handle != NULL, FALSE);
+
+  // walk through the ports and add all the arguments
+  for (i=0;i<oclass->numcontrols;i++) {
+    // connect the argument to the plugin
+    //g_print("added control port %d\n", oclass->control_portnums[i]);
+    desc->connect_port(ladspa->handle,
+                       oclass->control_portnums[i],
+                       &(ladspa->controls[i]));
+  }
+
+  // reactivate if it was activated before the reinstantiation
+  if (was_activated){
+    gst_ladspa_activate(ladspa);
+  }
+  return TRUE;
+}
+
+static GstElementStateReturn
+gst_ladspa_change_state (GstElement *element)
+{
+  LADSPA_Descriptor *desc;
+  GstLADSPA *ladspa = (GstLADSPA*)element;
+//  GstLADSPAClass *oclass = (GstLADSPAClass*)(G_OBJECT(ladspa)->klass);
+  desc = ladspa->descriptor;
+
+  //g_print("changing state\n");
+  switch (GST_STATE_TRANSITION (element)) {
+    case GST_STATE_NULL_TO_READY:
+      gst_ladspa_activate(ladspa);
+      break;
+    case GST_STATE_READY_TO_NULL:
+      gst_ladspa_deactivate(ladspa);
+      break;
+    default:
+      break;
+  }
+
+  if (GST_ELEMENT_CLASS (parent_class)->change_state)
+    return GST_ELEMENT_CLASS (parent_class)->change_state (element);
+
+  return GST_STATE_SUCCESS;
+}
+
+static void
+gst_ladspa_activate(GstLADSPA *ladspa)
+{
+  LADSPA_Descriptor *desc;
+  desc = ladspa->descriptor;
+  
+  if (ladspa->activated){
+    gst_ladspa_deactivate(ladspa);
+  }
+  
+  //g_print("activating\n");
+
+  // activate the plugin (function might be null)
+  if (desc->activate != NULL){
+    desc->activate(ladspa->handle);
+  }
+  
+  ladspa->activated = TRUE;
+}
+
+static void
+gst_ladspa_deactivate(GstLADSPA *ladspa)
+{
+  LADSPA_Descriptor *desc;
+  desc = ladspa->descriptor;
+
+  //g_print("deactivating\n");
+
+  // deactivate the plugin (function might be null)  
+  if (ladspa->activated && desc->deactivate != NULL){
+    desc->deactivate(ladspa->handle);
+  }
+  ladspa->activated = FALSE;
+}
+
+static void
+gst_ladspa_loop (GstElement *element)
+{
+  int i;
+  GstLADSPA *ladspa = (GstLADSPA *)element;
+  GstLADSPAClass *oclass = (GstLADSPAClass*)(G_OBJECT_GET_CLASS (ladspa));
+  LADSPA_Descriptor *desc;
+
+  desc = ladspa->descriptor;
+  do {
+    printf("looping something\n");
+
+    // first get all the necessary data from the input ports
+    for (i=0;i<oclass->numsinkpads;i++){  
+      ladspa->buffers[i] = gst_pad_pull(ladspa->sinkpads[i]);
+      printf("pulling buffer %d\n", i);
+    }
+    
+    for (i=0;i<oclass->numsinkpads;i++) {
+//      desc->connect_port(ladspa->handle,i,&(ladspa->controls[i]));
+    }
+
+    for (i=0;i<oclass->numsrcpads && i<oclass->numsinkpads;i++){
+      printf("pushing buffer %d\n", i);
+      gst_pad_push (ladspa->srcpads[i], ladspa->buffers[i]);
+      ladspa->buffers[i] = NULL;
+    }
+    
+  } while (!GST_ELEMENT_IS_COTHREAD_STOPPING (element));
+}
+
+static void
+gst_ladspa_chain_inplace_mono (GstPad *pad,GstBuffer *buf)
+{
+  LADSPA_Descriptor *desc;
+  LADSPA_Data *data;
+  unsigned long num_samples;
+  
+  GstLADSPA *ladspa;
+  GstLADSPAClass *oclass;
+
+  g_return_if_fail(pad != NULL);
+  g_return_if_fail(GST_IS_PAD(pad));
+  g_return_if_fail(buf != NULL);
+
+  ladspa = (GstLADSPA *)gst_pad_get_parent (pad);
+  g_return_if_fail(ladspa != NULL);
+
+  // this might happen if caps nego hasn't happened
+  g_return_if_fail(ladspa->handle != NULL);
+
+  oclass = (GstLADSPAClass*)(G_OBJECT_GET_CLASS (ladspa));
+  data=(LADSPA_Data*)GST_BUFFER_DATA(buf);
+  num_samples = GST_BUFFER_SIZE(buf) / sizeof(gfloat);
+  
+  desc = ladspa->descriptor;
+
+  desc->connect_port(ladspa->handle,oclass->sinkpad_portnums[0],data);
+  desc->connect_port(ladspa->handle,oclass->srcpad_portnums[0],data);
+
+  desc->run(ladspa->handle,num_samples);
+  
+  desc->connect_port(ladspa->handle,oclass->sinkpad_portnums[0],NULL);
+  desc->connect_port(ladspa->handle,oclass->srcpad_portnums[0],NULL);
+
+  gst_pad_push (ladspa->srcpads[0], buf);  
+}
+
+static GstBuffer *
+gst_ladspa_get_mono(GstPad *pad)
+{
+  LADSPA_Descriptor *desc;
+  LADSPA_Data *data;
+  
+  GstLADSPA *ladspa;
+  GstLADSPAClass *oclass;
+  GstBuffer *buf;
+
+  g_return_val_if_fail(pad != NULL, NULL);
+  g_return_val_if_fail(GST_IS_PAD(pad), NULL);
+
+  ladspa = (GstLADSPA *)gst_pad_get_parent (pad);
+  g_return_val_if_fail(ladspa != NULL, NULL);
+
+  // this might happen if caps nego hasn't happened
+  g_return_val_if_fail(ladspa->handle != NULL, NULL);
+
+  oclass = (GstLADSPAClass*)(G_OBJECT_GET_CLASS(ladspa));
+  
+  if (ladspa->newcaps) {
+    gst_ladspa_force_caps(ladspa, ladspa->srcpads[0]);
+  }
+  
+  buf = gst_buffer_new();
+  g_return_val_if_fail (buf, NULL);
+  data = g_new(LADSPA_Data, ladspa->buffersize);
+  GST_BUFFER_DATA(buf) = (gpointer) data;
+  GST_BUFFER_SIZE(buf) = sizeof(LADSPA_Data) * ladspa->buffersize;
+  GST_BUFFER_TIMESTAMP(buf) = ladspa->timestamp;
+
+  desc = ladspa->descriptor;
+  desc->connect_port(ladspa->handle,oclass->srcpad_portnums[0],data);
+  desc->run(ladspa->handle,(unsigned long)ladspa->buffersize);  
+  desc->connect_port(ladspa->handle,oclass->srcpad_portnums[0],NULL);
+  
+  return buf;
+}
+
+static GstBuffer *
+gst_ladspa_get(GstPad *pad)
+{
+  LADSPA_Descriptor *desc;
+  LADSPA_Data *data;
+  
+  GstLADSPA *ladspa;
+  GstLADSPAClass *oclass;
+  GstBuffer *buf;
+
+  g_return_val_if_fail(pad != NULL, NULL);
+  g_return_val_if_fail(GST_IS_PAD(pad), NULL);
+
+  ladspa = (GstLADSPA *)gst_pad_get_parent (pad);
+  g_return_val_if_fail(ladspa != NULL, NULL);
+
+  // this might happen if caps nego hasn't happened
+  g_return_val_if_fail(ladspa->handle != NULL, NULL);
+
+  oclass = (GstLADSPAClass*)(G_OBJECT_GET_CLASS(ladspa));
+  
+  if (ladspa->newcaps) {
+    gst_ladspa_force_caps(ladspa, ladspa->srcpads[0]);
+  }
+  
+  buf = gst_buffer_new();
+  g_return_val_if_fail (buf, NULL);
+  data = g_new(LADSPA_Data, ladspa->buffersize);
+  GST_BUFFER_DATA(buf) = (gpointer) data;
+  GST_BUFFER_SIZE(buf) = sizeof(LADSPA_Data) * ladspa->buffersize;
+  GST_BUFFER_TIMESTAMP(buf) = ladspa->timestamp;
+  ladspa->timestamp+= ladspa->buffersize * ladspa->samplerate * 10^9;
+
+  desc = ladspa->descriptor;
+  desc->connect_port(ladspa->handle,oclass->srcpad_portnums[0],data);
+  desc->run(ladspa->handle,(unsigned long)ladspa->buffersize);  
+  desc->connect_port(ladspa->handle,oclass->srcpad_portnums[0],NULL);
+  
+  return buf;
+}
+
+static void
+ladspa_describe_plugin(const char *pcFullFilename,
+                       void *pvPluginHandle,
+                       LADSPA_Descriptor_Function pfDescriptorFunction)
+{
+  const LADSPA_Descriptor *desc;
+  int i,j;
+  
+  GstElementDetails *details;
+  GTypeInfo typeinfo = {
+      sizeof(GstLADSPAClass),      NULL,
+      NULL,
+      (GClassInitFunc)gst_ladspa_class_init,
+      NULL,
+      NULL,
+      sizeof(GstLADSPA),
+      0,
+      (GInstanceInitFunc)gst_ladspa_init,
+  };
+  GType type;
+  GstElementFactory *factory;
+
+  // walk through all the plugins in this pluginlibrary
+  i = 0;
+  while ((desc = pfDescriptorFunction(i++))) {
+    gchar *type_name;
+
+    // construct the type
+    type_name = g_strdup_printf("ladspa_%s",desc->Label);
+    g_strcanon (type_name, G_CSET_A_2_Z G_CSET_a_2_z G_CSET_DIGITS "-_+", '-');
+    // if it's already registered, drop it
+    if (g_type_from_name(type_name)) {
+      g_free(type_name);
+      continue;
+    }
+    // create the type now
+    type = g_type_register_static(GST_TYPE_ELEMENT, type_name , &typeinfo, 0);
+
+    // construct the element details struct
+    details = g_new0(GstElementDetails,1);
+    details->longname = g_strdup(desc->Name);
+    details->klass = "Filter/LADSPA";
+    details->description = details->longname;
+    details->version = g_strdup_printf("%ld",desc->UniqueID);
+    details->author = g_strdup(desc->Maker);
+    details->copyright = g_strdup(desc->Copyright);
+
+    // register the plugin with gstreamer
+    factory = gst_elementfactory_new(type_name,type,details);
+    g_return_if_fail(factory != NULL);
+    gst_plugin_add_feature (ladspa_plugin, GST_PLUGIN_FEATURE (factory));
+
+    // add this plugin to the hash
+    g_hash_table_insert(ladspa_descriptors,
+                        GINT_TO_POINTER(type),
+                        (gpointer)desc);
+    
+
+    // only add sink padtemplate if there are sinkpads                        
+    for (j=0;j<desc->PortCount;j++) {
+      if (LADSPA_IS_PORT_AUDIO(desc->PortDescriptors[j]) &&
+          LADSPA_IS_PORT_INPUT(desc->PortDescriptors[j])) {
+        sinktempl = ladspa_sink_factory();
+        gst_elementfactory_add_padtemplate (factory, sinktempl);
+        break;
+      }
+    }
+  
+    srctempl = ladspa_src_factory();
+    gst_elementfactory_add_padtemplate (factory, srctempl);
+
+  }
+}
+
+static gboolean
+plugin_init (GModule *module, GstPlugin *plugin)
+{
+  
+  ladspa_descriptors = g_hash_table_new(NULL,NULL);
+  parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
+
+  ladspa_plugin = plugin;
+
+  LADSPAPluginSearch(ladspa_describe_plugin);
+
+  return TRUE;
+}
+
+GstPluginDesc plugin_desc = {
+  GST_VERSION_MAJOR,
+  GST_VERSION_MINOR,
+  "ladspa",
+  plugin_init
+};
+