gstreamer/ext/ladspa/gstladspa.c

/* GStreamer
 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
 *               <2001> Steve Baker <stevebaker_org@yahoo.co.uk>
 *               2003 Andy Wingo <wingo at pobox.com>
 *
 * 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.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <math.h>
#include <gst/audio/audio.h>

#include "gstladspa.h"
#include <ladspa.h>             /* main ladspa sdk include file */
#include "utils.h"              /* ladspa sdk utility functions */

/* 1.0 and the 1.1 preliminary headers don't define a version, but 1.1 final
   does */
#ifndef LADSPA_VERSION
#define LADSPA_VERSION "1.0"
#endif

static GstStaticCaps ladspa_pad_caps =
GST_STATIC_CAPS (GST_AUDIO_FLOAT_STANDARD_PAD_TEMPLATE_CAPS);

static void gst_ladspa_class_init (GstLADSPAClass * klass);
static void gst_ladspa_base_init (GstLADSPAClass * klass);
static void gst_ladspa_init (GstLADSPA * ladspa);

static void gst_ladspa_update_int (const GValue * value, gpointer data);
static GstPadLinkReturn gst_ladspa_link (GstPad * pad, const GstCaps * caps);

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 (GstPad * pad, GstData * _data);
static GstData *gst_ladspa_get (GstPad * pad);

static GstElementClass *parent_class = NULL;

static GstPlugin *ladspa_plugin;
static GHashTable *ladspa_descriptors;

enum
{
  ARG_0,
  ARG_SAMPLERATE,
  ARG_BUFFERSIZE,
  ARG_LAST
};

GST_DEBUG_CATEGORY_STATIC (ladspa_debug);
#define GST_CAT_DEFAULT ladspa_debug

static void
gst_ladspa_base_init (GstLADSPAClass * klass)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
  GstPadTemplate *templ;
  GstElementDetails *details;
  LADSPA_Descriptor *desc;
  gint j, sinkcount, srccount;

  desc = g_hash_table_lookup (ladspa_descriptors,
      GINT_TO_POINTER (G_TYPE_FROM_CLASS (klass)));
  if (!desc)
    desc = g_hash_table_lookup (ladspa_descriptors, GINT_TO_POINTER (0));
  g_assert (desc);

  /* pad templates */
  klass->numports = desc->PortCount;
  klass->numsinkpads = 0;
  klass->numsrcpads = 0;
  for (j = 0; j < desc->PortCount; j++) {
    if (LADSPA_IS_PORT_AUDIO (desc->PortDescriptors[j])) {
      gchar *name = g_strdup ((gchar *) desc->PortNames[j]);

      g_strcanon (name, G_CSET_A_2_Z G_CSET_a_2_z G_CSET_DIGITS "-", '-');

      /* the factories take ownership of the name */
      if (LADSPA_IS_PORT_INPUT (desc->PortDescriptors[j])) {
        templ = gst_pad_template_new (name, GST_PAD_SINK, GST_PAD_ALWAYS,
            gst_caps_copy (gst_static_caps_get (&ladspa_pad_caps)));
        klass->numsinkpads++;
      } else {
        templ = gst_pad_template_new (name, GST_PAD_SRC, GST_PAD_ALWAYS,
            gst_caps_copy (gst_static_caps_get (&ladspa_pad_caps)));
        klass->numsrcpads++;
      }

      gst_element_class_add_pad_template (element_class, templ);
    }
  }

  /* construct the element details struct */
  details = g_new0 (GstElementDetails, 1);
  details->longname = g_locale_to_utf8 (desc->Name, -1, NULL, NULL, NULL);
  if (!details->longname)
    details->longname = g_strdup ("no description available");
  details->description = details->longname;
  details->author = g_locale_to_utf8 (desc->Maker, -1, NULL, NULL, NULL);
  if (!details->author)
    details->author = g_strdup ("no author available");
  if ((klass->numsinkpads > 0) && (klass->numsrcpads > 0))
    details->klass = "Filter/Effect/Audio/LADSPA";
  else if ((klass->numsinkpads == 0) && (klass->numsrcpads > 0))
    details->klass = "Source/Audio/LADSPA";
  else if ((klass->numsinkpads > 0) && (klass->numsrcpads == 0))
    details->klass = "Sink/Audio/LADSPA";
  else
    details->klass = "Filter/Effect/Audio/LADSPA";      /* whatever this is */
  gst_element_class_set_details (element_class, details);

  klass->srcpad_portnums = g_new0 (gint, klass->numsrcpads);
  klass->sinkpad_portnums = g_new0 (gint, klass->numsinkpads);
  sinkcount = 0;
  srccount = 0;

  /* walk through the ports, note the portnums for srcpads, sinkpads */
  for (j = 0; j < desc->PortCount; j++) {
    if (LADSPA_IS_PORT_AUDIO (desc->PortDescriptors[j])) {
      if (LADSPA_IS_PORT_INPUT (desc->PortDescriptors[j]))
        klass->sinkpad_portnums[sinkcount++] = j;
      else
        klass->srcpad_portnums[srccount++] = j;
    }
  }

  klass->descriptor = desc;
}

static void
gst_ladspa_class_init (GstLADSPAClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;
  LADSPA_Descriptor *desc;
  gint i, current_portnum, controlcount;
  gint hintdesc;
  gint argtype, argperms;
  GParamSpec *paramspec = NULL;
  gchar *argname, *tempstr, *paren;

  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;

  /* look up and store the ladspa descriptor */
  desc = g_hash_table_lookup (ladspa_descriptors,
      GINT_TO_POINTER (G_TYPE_FROM_CLASS (klass)));
  if (!desc)
    desc = g_hash_table_lookup (ladspa_descriptors, GINT_TO_POINTER (0));
  g_assert (desc);

  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->numcontrols++;
  }

  GST_DEBUG ("ladspa element class: init %s with %d sink, %d src, %d control\n",
      g_type_name (G_TYPE_FROM_CLASS (klass)),
      klass->numsinkpads, klass->numsrcpads, klass->numcontrols);

  klass->control_portnums = g_new0 (gint, klass->numcontrols);
  controlcount = 0;

  /* walk through the ports, note the portnums for control params */
  for (i = 0; i < desc->PortCount; i++) {
    if (!LADSPA_IS_PORT_AUDIO (desc->PortDescriptors[i]) &&
        LADSPA_IS_PORT_INPUT (desc->PortDescriptors[i]))
      klass->control_portnums[controlcount++] = i;
  }

  /* now build the control 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_MAXFLOAT;
    }

    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;
        klass->control_info[i].upperbound *= 44100;     /* FIXME? */
      }
    } 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;
    }

    /* use the lowerbound as the default value */
    klass->control_info[i].def = klass->control_info[i].lowerbound;

#ifdef LADSPA_IS_HINT_HAS_DEFAULT
    /* figure out the defaults */
    if (LADSPA_IS_HINT_HAS_DEFAULT (hintdesc)) {
      if (LADSPA_IS_HINT_DEFAULT_MINIMUM (hintdesc))
        klass->control_info[i].def = klass->control_info[i].lowerbound;
      else if (LADSPA_IS_HINT_DEFAULT_LOW (hintdesc))
        if (LADSPA_IS_HINT_LOGARITHMIC (hintdesc))
          klass->control_info[i].def =
              exp (0.75 * log (klass->control_info[i].lowerbound) +
              0.25 * log (klass->control_info[i].upperbound));
        else
          klass->control_info[i].def =
              (0.75 * klass->control_info[i].lowerbound +
              0.25 * klass->control_info[i].upperbound);
      else if (LADSPA_IS_HINT_DEFAULT_MIDDLE (hintdesc))
        if (LADSPA_IS_HINT_LOGARITHMIC (hintdesc))
          klass->control_info[i].def =
              exp (0.5 * log (klass->control_info[i].lowerbound) +
              0.5 * log (klass->control_info[i].upperbound));
        else
          klass->control_info[i].def =
              (0.5 * klass->control_info[i].lowerbound +
              0.5 * klass->control_info[i].upperbound);
      else if (LADSPA_IS_HINT_DEFAULT_HIGH (hintdesc))
        if (LADSPA_IS_HINT_LOGARITHMIC (hintdesc))
          klass->control_info[i].def =
              exp (0.25 * log (klass->control_info[i].lowerbound) +
              0.75 * log (klass->control_info[i].upperbound));
        else
          klass->control_info[i].def =
              (0.25 * klass->control_info[i].lowerbound +
              0.75 * klass->control_info[i].upperbound);
      else if (LADSPA_IS_HINT_DEFAULT_MAXIMUM (hintdesc))
        klass->control_info[i].def = klass->control_info[i].upperbound;
      else if (LADSPA_IS_HINT_DEFAULT_0 (hintdesc))
        klass->control_info[i].def = 0.0;
      else if (LADSPA_IS_HINT_DEFAULT_1 (hintdesc))
        klass->control_info[i].def = 1.0;
      else if (LADSPA_IS_HINT_DEFAULT_100 (hintdesc))
        klass->control_info[i].def = 100.0;
      else if (LADSPA_IS_HINT_DEFAULT_440 (hintdesc))
        klass->control_info[i].def = 440.0;
    }
#endif /* LADSPA_IS_HINT_HAS_DEFAULT */

    klass->control_info[i].def = CLAMP (klass->control_info[i].def,
        klass->control_info[i].lowerbound, klass->control_info[i].upperbound);

    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);
    /* find out if there is a (unitname) at the end of the argname and get rid
       of it */
    paren = g_strrstr (argname, " (");
    if (paren != NULL) {
      *paren = '\0';
    }
    /* 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 "-", '-');
    /* satisfy glib2 (argname[0] must be [A-Za-z]) */
    if (!((argname[0] >= 'a' && argname[0] <= 'z') || (argname[0] >= 'A'
                && argname[0] <= 'Z'))) {
      tempstr = argname;
      argname = g_strconcat ("param-", argname, NULL);
      g_free (tempstr);
    }

    /* 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;
    }

    klass->control_info[i].param_name = argname;

    GST_DEBUG ("adding arg %s from %s with access-mode=%d", argname,
        klass->control_info[i].name, argperms);

    if (argtype == G_TYPE_BOOLEAN) {
      paramspec =
          g_param_spec_boolean (argname, argname, argname, FALSE, argperms);
    } else if (argtype == G_TYPE_INT) {
      if (klass->control_info[i].lowerbound > klass->control_info[i].upperbound) {
        gfloat swap;

        GST_ERROR
            ("  wrong order of parameter bounds %f ... %f ... %f in \"%s\" plugin",
            klass->control_info[i].lowerbound, klass->control_info[i].def,
            klass->control_info[i].upperbound, klass->descriptor->Name);

        swap = klass->control_info[i].upperbound;
        klass->control_info[i].upperbound = klass->control_info[i].lowerbound;
        klass->control_info[i].lowerbound = swap;
      }
      paramspec = g_param_spec_int (argname, argname, argname,
          (gint) klass->control_info[i].lowerbound,
          (gint) klass->control_info[i].upperbound,
          (gint) klass->control_info[i].def, argperms);
    } else if (klass->control_info[i].samplerate) {
      paramspec = g_param_spec_float (argname, argname, argname,
          0.0, G_MAXFLOAT, 0.0, argperms);
    } else {
      if (klass->control_info[i].lowerbound > klass->control_info[i].upperbound) {
        gfloat swap;

        GST_ERROR
            ("  wrong order of parameter bounds %f ... %f ... %f in \"%s\" plugin",
            klass->control_info[i].lowerbound, klass->control_info[i].def,
            klass->control_info[i].upperbound, klass->descriptor->Name);

        swap = klass->control_info[i].upperbound;
        klass->control_info[i].upperbound = klass->control_info[i].lowerbound;
        klass->control_info[i].lowerbound = swap;
      }
      paramspec = g_param_spec_float (argname, argname, argname,
          klass->control_info[i].lowerbound, klass->control_info[i].upperbound,
          klass->control_info[i].def, argperms);
    }

    /* properties have an offset of 1 */
    g_object_class_install_property (G_OBJECT_CLASS (klass), i + 1, paramspec);
  }
}

static void
gst_ladspa_init (GstLADSPA * ladspa)
{
  GstLADSPAClass *oclass;
  ladspa_control_info cinfo;
  GList *l;
  LADSPA_Descriptor *desc;
  gint i, sinkcount, srccount;

  oclass = (GstLADSPAClass *) G_OBJECT_GET_CLASS (ladspa);
  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);

  /* set up pads */
  sinkcount = 0;
  srccount = 0;
  for (l = GST_ELEMENT_CLASS (oclass)->padtemplates; l; l = l->next) {
    GstPad *pad = gst_pad_new_from_template (GST_PAD_TEMPLATE (l->data),
        GST_PAD_TEMPLATE_NAME_TEMPLATE (l->data));

    gst_pad_set_link_function (pad, gst_ladspa_link);
    gst_element_add_pad ((GstElement *) ladspa, pad);

    if (GST_PAD_DIRECTION (pad) == GST_PAD_SINK)
      ladspa->sinkpads[sinkcount++] = pad;
    else
      ladspa->srcpads[srccount++] = pad;
  }

  /* nonzero default needed to instantiate() some plugins */
  ladspa->samplerate = 44100;

  ladspa->buffer_frames = 0;    /* should be set with caps */
  ladspa->activated = FALSE;
  ladspa->inplace_broken =
      LADSPA_IS_INPLACE_BROKEN (ladspa->descriptor->Properties);

  if (sinkcount == 0 && srccount == 1) {
    /* get mode (no sink pads) */
    GST_DEBUG_OBJECT (ladspa, "mono get mode with 1 src pad");

    gst_pad_set_get_function (ladspa->srcpads[0], gst_ladspa_get);
  } else if (sinkcount == 1) {
    /* with one sink we can use the chain function */
    GST_DEBUG_OBJECT (ladspa, "chain mode");

    gst_pad_set_chain_function (ladspa->sinkpads[0], gst_ladspa_chain);
  } else if (sinkcount > 1) {
    /* more than one sink pad needs loop mode */
    GST_DEBUG_OBJECT (ladspa, "loop mode with %d sink pads and %d src pads",
        sinkcount, srccount);

    gst_element_set_loop_function (GST_ELEMENT (ladspa), gst_ladspa_loop);
  } else if (sinkcount == 0 && srccount == 0) {
    /* for example, a plugin with only control inputs and output -- just ignore
     * it for now */
  } else {
    g_warning ("%d sink pads, %d src pads not yet supported", sinkcount,
        srccount);
  }

  gst_ladspa_instantiate (ladspa);
}

static void
gst_ladspa_update_int (const GValue * value, gpointer data)
{
  gfloat *target = (gfloat *) data;

  *target = (gfloat) g_value_get_int (value);
}

static GstPadLinkReturn
gst_ladspa_link (GstPad * pad, const GstCaps * caps)
{
  GstElement *element = (GstElement *) GST_PAD_PARENT (pad);
  GstLADSPA *ladspa = (GstLADSPA *) element;
  const GList *l = NULL;
  gint rate;
  GstStructure *structure;

  /* if this fails in some other plugin, the graph is left in an inconsistent
     state */
  for (l = gst_element_get_pad_list (element); l; l = l->next)
    if (pad != (GstPad *) l->data)
      if (gst_pad_try_set_caps ((GstPad *) l->data, caps) <= 0)
        return GST_PAD_LINK_REFUSED;

  /* we assume that the ladspa plugin can handle any sample rate, so this
     check gets put last */
  structure = gst_caps_get_structure (caps, 0);
  gst_structure_get_int (structure, "rate", &rate);
  /* have to instantiate ladspa plugin when samplerate changes (groan) */
  if (ladspa->samplerate != rate) {
    ladspa->samplerate = rate;
    if (!gst_ladspa_instantiate (ladspa))
      return GST_PAD_LINK_REFUSED;
  }

  gst_structure_get_int (structure, "buffer-frames", &ladspa->buffer_frames);

  return GST_PAD_LINK_OK;
}

#if 0
static void
gst_ladspa_force_src_caps (GstLADSPA * ladspa, GstPad * pad)
{
  if (!ladspa->buffer_frames) {
    ladspa->buffer_frames = 256;        /* 5 ms at 44100 kHz (just a default...) */
  }

  GST_DEBUG_OBJECT (ladspa, "forcing caps with rate=%d, buffer-frames=%d",
      ladspa->samplerate, ladspa->buffer_frames);

  gst_pad_try_set_caps (pad,
      gst_caps_new ("ladspa_src_caps",
          "audio/x-raw-float",
          gst_props_new ("width", G_TYPE_INT (32),
              "endianness", G_TYPE_INT (G_BYTE_ORDER),
              "rate", G_TYPE_INT (ladspa->samplerate),
              "buffer-frames", G_TYPE_INT (ladspa->buffer_frames),
              "channels", G_TYPE_INT (1), NULL)));
}
#endif

static void
gst_ladspa_set_property (GObject * object, guint prop_id, const GValue * value,
    GParamSpec * pspec)
{
  GstLADSPA *ladspa = (GstLADSPA *) object;
  GstLADSPAClass *oclass;
  ladspa_control_info *control_info;

  oclass = (GstLADSPAClass *) (G_OBJECT_GET_CLASS (object));

  /* remember, properties have an offset of 1 */
  prop_id--;

  /* verify it exists */
  g_return_if_fail (prop_id < oclass->numcontrols);

  control_info = &(oclass->control_info[prop_id]);
  g_return_if_fail (control_info->name != NULL);

  /* check to see if it's writable */
  g_return_if_fail (control_info->writable);

  /* now see what type it is */
  if (control_info->toggled)
    ladspa->controls[prop_id] = g_value_get_boolean (value) ? 1.f : 0.f;
  else if (control_info->integer)
    ladspa->controls[prop_id] = g_value_get_int (value);
  else
    ladspa->controls[prop_id] = g_value_get_float (value);

  GST_DEBUG_OBJECT (object, "set arg %s to %f", control_info->name,
      ladspa->controls[prop_id]);
}

static void
gst_ladspa_get_property (GObject * object, guint prop_id, GValue * value,
    GParamSpec * pspec)
{
  GstLADSPA *ladspa = (GstLADSPA *) object;
  GstLADSPAClass *oclass = (GstLADSPAClass *) (G_OBJECT_GET_CLASS (object));
  ladspa_control_info *control_info;

  /* remember, properties have an offset of 1 */
  prop_id--;

  /* verify it exists */
  g_return_if_fail (prop_id < oclass->numcontrols);

  control_info = &(oclass->control_info[prop_id]);
  g_return_if_fail (control_info->name != NULL);

  /* now see what type it is */
  if (control_info->toggled)
    g_value_set_boolean (value, ladspa->controls[prop_id] == 1.0);
  else if (control_info->integer)
    g_value_set_int (value, (gint) ladspa->controls[prop_id]);
  else
    g_value_set_float (value, ladspa->controls[prop_id]);

  GST_DEBUG_OBJECT (object, "got arg %s as %f", control_info->name,
      ladspa->controls[prop_id]);
}

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 */
  GST_DEBUG_OBJECT (ladspa, "instantiating the plugin at %d Hz",
      ladspa->samplerate);

  ladspa->handle = desc->instantiate (desc, ladspa->samplerate);
  g_return_val_if_fail (ladspa->handle != NULL, FALSE);

  /* connect the control ports */
  for (i = 0; i < oclass->numcontrols; 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;

  desc = ladspa->descriptor;

  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);

  GST_DEBUG_OBJECT (ladspa, "activating");

  /* 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;

  GST_DEBUG_OBJECT (ladspa, "deactivating");

  /* 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)
{
  guint i, j, numsrcpads, numsinkpads;
  glong num_samples;
  LADSPA_Data **data_in, **data_out;
  GstBuffer **buffers_in, **buffers_out;

  GstLADSPA *ladspa = (GstLADSPA *) element;
  GstLADSPAClass *oclass = (GstLADSPAClass *) (G_OBJECT_GET_CLASS (ladspa));
  LADSPA_Descriptor *desc = ladspa->descriptor;

  numsinkpads = oclass->numsinkpads;
  numsrcpads = oclass->numsrcpads;

  /* fixme: these mallocs need to die */
  data_in = g_new0 (LADSPA_Data *, numsinkpads);
  data_out = g_new0 (LADSPA_Data *, numsrcpads);
  buffers_in = g_new0 (GstBuffer *, numsinkpads);
  buffers_out = g_new0 (GstBuffer *, numsrcpads);

  /* determine largest buffer */
  num_samples = -1;

  /* first get all the necessary data from the input ports */
  for (i = 0; i < numsinkpads; i++) {
  get_buffer:
    buffers_in[i] = GST_BUFFER (gst_pad_pull (ladspa->sinkpads[i]));

    if (GST_IS_EVENT (buffers_in[i])) {
      /* push it out on all pads */
      gst_data_ref_by_count ((GstData *) buffers_in[i], numsrcpads);
      for (j = 0; j < numsrcpads; j++)
        gst_pad_push (ladspa->srcpads[j], GST_DATA (buffers_in[i]));
      if (GST_EVENT_TYPE (buffers_in[i]) == GST_EVENT_EOS) {
        /* shut down */
        gst_element_set_eos (element);
        return;
      } else {
        goto get_buffer;
      }
    }

    if (num_samples < 0)
      num_samples = GST_BUFFER_SIZE (buffers_in[i]) / sizeof (gfloat);
    else
      num_samples =
          MIN (GST_BUFFER_SIZE (buffers_in[i]) / sizeof (gfloat), num_samples);
    data_in[i] = (LADSPA_Data *) GST_BUFFER_DATA (buffers_in[i]);
    GST_BUFFER_TIMESTAMP (buffers_in[i]) = ladspa->timestamp;
  }

  i = 0;
  if (!ladspa->inplace_broken) {
    for (; i < numsrcpads && i < numsinkpads; i++) {
      /* reuse input buffers */
      buffers_out[i] = buffers_in[i];
      data_out[i] = data_in[i];
    }
  }
  for (; i < numsrcpads; i++) {
    buffers_out[i] =
        gst_buffer_new_and_alloc (ladspa->buffer_frames * sizeof (gfloat));
    GST_BUFFER_TIMESTAMP (buffers_out[i]) = ladspa->timestamp;
    data_out[i] = (LADSPA_Data *) GST_BUFFER_DATA (buffers_out[i]);
  }

  /* process chunk */
  for (i = 0; i < numsinkpads; i++)
    desc->connect_port (ladspa->handle, oclass->sinkpad_portnums[i],
        data_in[i]);
  for (i = 0; i < numsrcpads; i++)
    desc->connect_port (ladspa->handle, oclass->srcpad_portnums[i],
        data_out[i]);

  desc->run (ladspa->handle, num_samples);

  for (i = 0; i < numsinkpads; i++) {
    if (i >= numsrcpads || buffers_out[i] != buffers_in[i])
      gst_buffer_unref (buffers_in[i]);
    data_in[i] = NULL;
    buffers_in[i] = NULL;
  }
  for (i = 0; i < numsrcpads; i++) {
    GST_DEBUG_OBJECT (ladspa, "pushing buffer (%p) on src pad %d",
        buffers_out[i], i);
    gst_pad_push (ladspa->srcpads[i], GST_DATA (buffers_out[i]));

    data_out[i] = NULL;
    buffers_out[i] = NULL;
  }

  ladspa->timestamp += ladspa->buffer_frames * GST_SECOND / ladspa->samplerate;

  /* FIXME: move these mallocs and frees to the state-change handler */

  g_free (buffers_out);
  g_free (buffers_in);
  g_free (data_out);
  g_free (data_in);
}

static void
gst_ladspa_chain (GstPad * pad, GstData * _data)
{
  GstBuffer *buffer_in = GST_BUFFER (_data);
  LADSPA_Descriptor *desc;
  LADSPA_Data *data_in, **data_out = NULL;
  GstBuffer **buffers_out = NULL;
  gulong num_samples;
  guint i, numsrcpads;
  GstLADSPA *ladspa;
  GstLADSPAClass *oclass;

  ladspa = (GstLADSPA *) GST_OBJECT_PARENT (pad);
  oclass = (GstLADSPAClass *) (G_OBJECT_GET_CLASS (ladspa));
  data_in = (LADSPA_Data *) GST_BUFFER_DATA (buffer_in);
  num_samples = GST_BUFFER_SIZE (buffer_in) / sizeof (gfloat);
  numsrcpads = oclass->numsrcpads;
  desc = ladspa->descriptor;

  /* we shouldn't get events here... */
  g_return_if_fail (GST_IS_BUFFER (buffer_in));

  /* FIXME: this function shouldn't need to malloc() anything */
  if (numsrcpads > 0) {
    buffers_out = g_new (GstBuffer *, numsrcpads);
    data_out = g_new (LADSPA_Data *, numsrcpads);
  }

  i = 0;
  if (!ladspa->inplace_broken && numsrcpads) {
    /* reuse the first (chained) buffer */
    buffers_out[i] = buffer_in;
    GST_DEBUG ("reuse: %d", GST_BUFFER_SIZE (buffer_in));
    data_out[i] = data_in;
    i++;
  }
  for (; i < numsrcpads; i++) {
    buffers_out[i] = gst_buffer_new_and_alloc (GST_BUFFER_SIZE (buffer_in));
    GST_DEBUG ("new %d", GST_BUFFER_SIZE (buffer_in));
    GST_BUFFER_TIMESTAMP (buffers_out[i]) = ladspa->timestamp;
    data_out[i] = (LADSPA_Data *) GST_BUFFER_DATA (buffers_out[i]);
  }

  /* process chunk */
  desc->connect_port (ladspa->handle, oclass->sinkpad_portnums[0], data_in);
  for (i = 0; i < numsrcpads; i++)
    desc->connect_port (ladspa->handle, oclass->srcpad_portnums[i],
        data_out[i]);

  desc->run (ladspa->handle, num_samples);

  if (!numsrcpads || buffers_out[0] != buffer_in)
    gst_buffer_unref (buffer_in);

  if (numsrcpads) {
    for (i = 0; i < numsrcpads; i++) {
      GST_DEBUG_OBJECT (ladspa,
          "pushing buffer (%p, length %u bytes) on src pad %d", buffers_out[i],
          GST_BUFFER_SIZE (buffers_out[i]), i);
      gst_pad_push (ladspa->srcpads[i], GST_DATA (buffers_out[i]));
    }

    g_free (buffers_out);
    g_free (data_out);
  }
}

static GstData *
gst_ladspa_get (GstPad * pad)
{
  GstLADSPA *ladspa;
  GstLADSPAClass *oclass;
  GstBuffer *buf;
  LADSPA_Data *data;
  LADSPA_Descriptor *desc;

  ladspa = (GstLADSPA *) gst_pad_get_parent (pad);
  oclass = (GstLADSPAClass *) (G_OBJECT_GET_CLASS (ladspa));
  desc = ladspa->descriptor;

  /* 4096 is arbitrary */
  buf = gst_buffer_new_and_alloc (4096);
  GST_BUFFER_TIMESTAMP (buf) = ladspa->timestamp;
  data = (LADSPA_Data *) GST_BUFFER_DATA (buf);

  /* update timestamp */
  ladspa->timestamp += num_to_process * GST_SECOND / ladspa->samplerate;

  /* process chunk */
  desc->connect_port (ladspa->handle, oclass->srcpad_portnums[0], data);

  desc->run (ladspa->handle, ladspa->buffer_frames);

  return GST_DATA (buf);
}

static void
ladspa_describe_plugin (const char *pcFullFilename,
    void *pvPluginHandle, LADSPA_Descriptor_Function pfDescriptorFunction)
{
  const LADSPA_Descriptor *desc;
  gint i;
  GTypeInfo typeinfo = {
    sizeof (GstLADSPAClass),
    (GBaseInitFunc) gst_ladspa_base_init,
    NULL,
    (GClassInitFunc) gst_ladspa_class_init,
    NULL,
    NULL,
    sizeof (GstLADSPA),
    0,
    (GInstanceInitFunc) gst_ladspa_init,
  };
  GType type;

  /* 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;
    }

    /* base-init temp alloc */
    g_hash_table_insert (ladspa_descriptors,
        GINT_TO_POINTER (0), (gpointer) desc);

    /* create the type now */
    type = g_type_register_static (GST_TYPE_ELEMENT, type_name, &typeinfo, 0);
    if (!gst_element_register (ladspa_plugin, type_name, GST_RANK_NONE, type))
      continue;

    /* add this plugin to the hash */
    g_hash_table_insert (ladspa_descriptors,
        GINT_TO_POINTER (type), (gpointer) desc);
  }

  g_hash_table_remove (ladspa_descriptors, GINT_TO_POINTER (0));
}

static gboolean
plugin_init (GstPlugin * plugin)
{
  GST_DEBUG_CATEGORY_INIT (ladspa_debug, "ladspa",
      GST_DEBUG_FG_GREEN | GST_DEBUG_BG_BLACK | GST_DEBUG_BOLD, "LADSPA");

  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;
}

GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
    GST_VERSION_MINOR,
    "ladspa",
    "All LADSPA plugins",
    plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)