freir0: Add support for frei0r mixer plugins

1 files changed, 779 insertions, 0 deletions

diff --git a/gst/frei0r/gstfrei0rmixer.c b/gst/frei0r/gstfrei0rmixer.c
new file mode 100644
index 000000000..5e2f5e3c3
--- /dev/null
+++ b/gst/frei0r/gstfrei0rmixer.c
@@ -0,0 +1,779 @@
+/* GStreamer
+ * Copyright (C) 2009 Sebastian Dröge <sebastian.droege@collabora.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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <string.h>
+
+#include "gstfrei0r.h"
+#include "gstfrei0rmixer.h"
+
+GST_DEBUG_CATEGORY_EXTERN (frei0r_debug);
+#define GST_CAT_DEFAULT frei0r_debug
+
+typedef struct
+{
+  f0r_plugin_info_t info;
+  GstFrei0rFuncTable ftable;
+} GstFrei0rMixerClassData;
+
+static void
+gst_frei0r_mixer_reset (GstFrei0rMixer * self)
+{
+  GstFrei0rMixerClass *klass = GST_FREI0R_MIXER_GET_CLASS (self);
+
+  if (self->f0r_instance) {
+    klass->ftable->destruct (self->f0r_instance);
+    self->f0r_instance = NULL;
+  }
+
+  gst_caps_replace (&self->caps, NULL);
+  gst_event_replace (&self->newseg_event, NULL);
+}
+
+static void
+gst_frei0r_mixer_finalize (GObject * object)
+{
+  GstFrei0rMixer *self = GST_FREI0R_MIXER (object);
+  GstFrei0rMixerClass *klass = GST_FREI0R_MIXER_GET_CLASS (object);
+
+  if (self->property_cache)
+    gst_frei0r_property_cache_free (klass->properties, self->property_cache,
+        klass->n_properties);
+  self->property_cache = NULL;
+
+  G_OBJECT_CLASS (g_type_class_peek_parent (klass))->finalize (object);
+}
+
+static void
+gst_frei0r_mixer_get_property (GObject * object, guint prop_id, GValue * value,
+    GParamSpec * pspec)
+{
+  GstFrei0rMixer *self = GST_FREI0R_MIXER (object);
+  GstFrei0rMixerClass *klass = GST_FREI0R_MIXER_GET_CLASS (object);
+
+  if (!gst_frei0r_get_property (self->f0r_instance, klass->ftable,
+          klass->properties, klass->n_properties, self->property_cache, prop_id,
+          value))
+    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+}
+
+static void
+gst_frei0r_mixer_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  GstFrei0rMixer *self = GST_FREI0R_MIXER (object);
+  GstFrei0rMixerClass *klass = GST_FREI0R_MIXER_GET_CLASS (object);
+
+  if (!gst_frei0r_set_property (self->f0r_instance, klass->ftable,
+          klass->properties, klass->n_properties, self->property_cache, prop_id,
+          value))
+    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+}
+
+static GstStateChangeReturn
+gst_frei0r_mixer_change_state (GstElement * element, GstStateChange transition)
+{
+  GstFrei0rMixer *self = GST_FREI0R_MIXER (element);
+  GstFrei0rMixerClass *klass = GST_FREI0R_MIXER_GET_CLASS (self);
+  GstStateChangeReturn ret;
+
+  switch (transition) {
+    case GST_STATE_CHANGE_NULL_TO_READY:
+      break;
+    case GST_STATE_CHANGE_READY_TO_PAUSED:
+      gst_collect_pads_start (self->collect);
+      break;
+    case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
+      break;
+    default:
+      break;
+  }
+
+  /* Stop before calling the parent's state change function as
+   * GstCollectPads might take locks and we would deadlock in that
+   * case
+   */
+  if (transition == GST_STATE_CHANGE_PAUSED_TO_READY)
+    gst_collect_pads_stop (self->collect);
+
+  ret =
+      GST_ELEMENT_CLASS (g_type_class_peek_parent (klass))->change_state
+      (element, transition);
+
+  switch (transition) {
+    case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
+      break;
+    case GST_STATE_CHANGE_PAUSED_TO_READY:
+      gst_frei0r_mixer_reset (self);
+      break;
+    case GST_STATE_CHANGE_READY_TO_NULL:
+      break;
+    default:
+      break;
+  }
+
+  return ret;
+}
+
+static GstCaps *
+gst_frei0r_mixer_get_caps (GstPad * pad)
+{
+  GstFrei0rMixer *self = GST_FREI0R_MIXER (gst_pad_get_parent (pad));
+  GstCaps *caps = NULL;
+
+  if (self->caps) {
+    caps = gst_caps_ref (self->caps);
+  } else {
+    GstCaps *tmp, *tmp1;
+
+    tmp = gst_caps_copy (gst_pad_get_pad_template_caps (self->src));
+    tmp1 = gst_pad_peer_get_caps (pad);
+    if (tmp1) {
+      caps = gst_caps_intersect (tmp, tmp1);
+      gst_caps_unref (tmp1);
+      gst_caps_unref (tmp);
+    } else {
+      caps = tmp;
+    }
+
+    tmp = caps;
+    tmp1 = gst_pad_peer_get_caps (self->sink0);
+    if (tmp1) {
+      caps = gst_caps_intersect (tmp, tmp1);
+      gst_caps_unref (tmp);
+      gst_caps_unref (tmp1);
+    }
+
+    tmp = caps;
+    tmp1 = gst_pad_peer_get_caps (self->sink1);
+    if (tmp1) {
+      caps = gst_caps_intersect (tmp, tmp1);
+      gst_caps_unref (tmp);
+      gst_caps_unref (tmp1);
+    }
+
+    if (self->sink2) {
+      tmp = caps;
+      tmp1 = gst_pad_peer_get_caps (self->sink2);
+      if (tmp1) {
+        caps = gst_caps_intersect (tmp, tmp1);
+        gst_caps_unref (tmp);
+        gst_caps_unref (tmp1);
+      }
+    }
+  }
+
+  gst_object_unref (self);
+
+  return caps;
+}
+
+static gboolean
+gst_frei0r_mixer_set_caps (GstPad * pad, GstCaps * caps)
+{
+  GstFrei0rMixer *self = GST_FREI0R_MIXER (gst_pad_get_parent (pad));
+  GstFrei0rMixerClass *klass = GST_FREI0R_MIXER_GET_CLASS (self);
+  gboolean ret = TRUE;
+
+  gst_caps_replace (&self->caps, caps);
+
+  if (pad != self->src)
+    ret &= gst_pad_set_caps (self->src, caps);
+  if (pad != self->sink0)
+    ret &= gst_pad_set_caps (self->sink0, caps);
+  if (pad != self->sink1)
+    ret &= gst_pad_set_caps (self->sink1, caps);
+  if (pad != self->sink2 && self->sink2)
+    ret &= gst_pad_set_caps (self->sink2, caps);
+
+  if (ret) {
+    if (!gst_video_format_parse_caps (caps, &self->fmt, &self->width,
+            &self->height)) {
+      ret = FALSE;
+      goto out;
+    }
+
+    if (self->f0r_instance) {
+      klass->ftable->destruct (self->f0r_instance);
+      self->f0r_instance = NULL;
+    }
+
+    self->f0r_instance =
+        gst_frei0r_instance_construct (klass->ftable, klass->properties,
+        klass->n_properties, self->property_cache, self->width, self->height);
+
+  }
+out:
+
+  gst_object_unref (self);
+
+  return ret;
+}
+
+static gboolean
+gst_frei0r_mixer_src_query_duration (GstFrei0rMixer * self, GstQuery * query)
+{
+  gint64 min;
+  gboolean res;
+  GstFormat format;
+  GstIterator *it;
+  gboolean done;
+
+  /* parse format */
+  gst_query_parse_duration (query, &format, NULL);
+
+  min = -1;
+  res = TRUE;
+  done = FALSE;
+
+  /* Take minimum of all durations */
+  it = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (self));
+  while (!done) {
+    GstIteratorResult ires;
+    gpointer item;
+
+    ires = gst_iterator_next (it, &item);
+    switch (ires) {
+      case GST_ITERATOR_DONE:
+        done = TRUE;
+        break;
+      case GST_ITERATOR_OK:
+      {
+        GstPad *pad = GST_PAD_CAST (item);
+        gint64 duration;
+
+        /* ask sink peer for duration */
+        res &= gst_pad_query_peer_duration (pad, &format, &duration);
+        /* take min from all valid return values */
+        if (res) {
+          /* valid unknown length, stop searching */
+          if (duration == -1) {
+            min = duration;
+            done = TRUE;
+          }
+          /* else see if smaller than current min */
+          else if (duration < min)
+            min = duration;
+        }
+        gst_object_unref (pad);
+        break;
+      }
+      case GST_ITERATOR_RESYNC:
+        min = -1;
+        res = TRUE;
+        gst_iterator_resync (it);
+        break;
+      default:
+        res = FALSE;
+        done = TRUE;
+        break;
+    }
+  }
+  gst_iterator_free (it);
+
+  if (res) {
+    /* and store the min */
+    GST_DEBUG_OBJECT (self, "Total duration in format %s: %"
+        GST_TIME_FORMAT, gst_format_get_name (format), GST_TIME_ARGS (min));
+    gst_query_set_duration (query, format, min);
+  }
+
+  return res;
+}
+
+static gboolean
+gst_frei0r_mixer_src_query_latency (GstFrei0rMixer * self, GstQuery * query)
+{
+  GstClockTime min, max;
+  gboolean live;
+  gboolean res;
+  GstIterator *it;
+  gboolean done;
+
+  res = TRUE;
+  done = FALSE;
+
+  live = FALSE;
+  min = 0;
+  max = GST_CLOCK_TIME_NONE;
+
+  /* Take maximum of all latency values */
+  it = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (self));
+  while (!done) {
+    GstIteratorResult ires;
+    gpointer item;
+
+    ires = gst_iterator_next (it, &item);
+    switch (ires) {
+      case GST_ITERATOR_DONE:
+        done = TRUE;
+        break;
+      case GST_ITERATOR_OK:
+      {
+        GstPad *pad = GST_PAD_CAST (item);
+        GstQuery *peerquery;
+        GstClockTime min_cur, max_cur;
+        gboolean live_cur;
+
+        peerquery = gst_query_new_latency ();
+
+        /* Ask peer for latency */
+        res &= gst_pad_peer_query (pad, peerquery);
+
+        /* take max from all valid return values */
+        if (res) {
+          gst_query_parse_latency (peerquery, &live_cur, &min_cur, &max_cur);
+
+          if (min_cur > min)
+            min = min_cur;
+
+          if (max_cur != GST_CLOCK_TIME_NONE &&
+              ((max != GST_CLOCK_TIME_NONE && max_cur > max) ||
+                  (max == GST_CLOCK_TIME_NONE)))
+            max = max_cur;
+
+          live = live || live_cur;
+        }
+
+        gst_query_unref (peerquery);
+        gst_object_unref (pad);
+        break;
+      }
+      case GST_ITERATOR_RESYNC:
+        live = FALSE;
+        min = 0;
+        max = GST_CLOCK_TIME_NONE;
+        res = TRUE;
+        gst_iterator_resync (it);
+        break;
+      default:
+        res = FALSE;
+        done = TRUE;
+        break;
+    }
+  }
+  gst_iterator_free (it);
+
+  if (res) {
+    /* store the results */
+    GST_DEBUG_OBJECT (self, "Calculated total latency: live %s, min %"
+        GST_TIME_FORMAT ", max %" GST_TIME_FORMAT,
+        (live ? "yes" : "no"), GST_TIME_ARGS (min), GST_TIME_ARGS (max));
+    gst_query_set_latency (query, live, min, max);
+  }
+
+  return res;
+}
+
+static gboolean
+gst_frei0r_mixer_src_query (GstPad * pad, GstQuery * query)
+{
+  GstFrei0rMixer *self = GST_FREI0R_MIXER (gst_pad_get_parent (pad));
+  gboolean ret = FALSE;
+
+  switch (GST_QUERY_TYPE (query)) {
+    case GST_QUERY_POSITION:
+      ret = gst_pad_query (self->sink0, query);
+      break;
+    case GST_QUERY_DURATION:
+      ret = gst_frei0r_mixer_src_query_duration (self, query);
+      break;
+    case GST_QUERY_LATENCY:
+      ret = gst_frei0r_mixer_src_query_latency (self, query);
+      break;
+    default:
+      ret = gst_pad_query_default (pad, query);
+      break;
+  }
+
+  gst_object_unref (self);
+
+  return ret;
+}
+
+static gboolean
+gst_frei0r_mixer_sink_query (GstPad * pad, GstQuery * query)
+{
+  GstFrei0rMixer *self = GST_FREI0R_MIXER (gst_pad_get_parent (pad));
+  gboolean ret = gst_pad_query (self->src, query);
+
+  gst_object_unref (self);
+
+  return ret;
+}
+
+static gboolean
+forward_event_func (GstPad * pad, GValue * ret, GstEvent * event)
+{
+  gst_event_ref (event);
+  GST_LOG_OBJECT (pad, "About to send event %s", GST_EVENT_TYPE_NAME (event));
+  if (!gst_pad_push_event (pad, event)) {
+    g_value_set_boolean (ret, FALSE);
+    GST_WARNING_OBJECT (pad, "Sending event  %p (%s) failed.",
+        event, GST_EVENT_TYPE_NAME (event));
+  } else {
+    GST_LOG_OBJECT (pad, "Sent event  %p (%s).",
+        event, GST_EVENT_TYPE_NAME (event));
+  }
+  gst_object_unref (pad);
+  return TRUE;
+}
+
+static gboolean
+forward_event (GstFrei0rMixer * self, GstEvent * event)
+{
+  GstIterator *it;
+  GValue vret = { 0 };
+
+  GST_LOG_OBJECT (self, "Forwarding event %p (%s)", event,
+      GST_EVENT_TYPE_NAME (event));
+
+  g_value_init (&vret, G_TYPE_BOOLEAN);
+  g_value_set_boolean (&vret, TRUE);
+  it = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (self));
+  gst_iterator_fold (it, (GstIteratorFoldFunction) forward_event_func, &vret,
+      event);
+  gst_iterator_free (it);
+  gst_event_unref (event);
+
+  return g_value_get_boolean (&vret);
+}
+
+static gboolean
+gst_frei0r_mixer_src_event (GstPad * pad, GstEvent * event)
+{
+  GstFrei0rMixer *self = GST_FREI0R_MIXER (gst_pad_get_parent (pad));
+  gboolean ret = FALSE;
+
+  switch (GST_EVENT_TYPE (event)) {
+    case GST_EVENT_QOS:
+      /* QoS might be tricky */
+      ret = FALSE;
+      break;
+    case GST_EVENT_SEEK:
+    {
+      GstSeekFlags flags;
+
+      /* parse the seek parameters */
+      gst_event_parse_seek (event, NULL, NULL, &flags, NULL, NULL, NULL, NULL);
+
+      /* check if we are flushing */
+      if (flags & GST_SEEK_FLAG_FLUSH) {
+        /* make sure we accept nothing anymore and return WRONG_STATE */
+        gst_collect_pads_set_flushing (self->collect, TRUE);
+
+        /* flushing seek, start flush downstream, the flush will be done
+         * when all pads received a FLUSH_STOP. */
+        gst_pad_push_event (self->src, gst_event_new_flush_start ());
+      }
+
+      ret = forward_event (self, event);
+      break;
+    }
+    case GST_EVENT_NAVIGATION:
+      /* navigation is rather pointless. */
+      ret = FALSE;
+      break;
+    default:
+      /* just forward the rest for now */
+      ret = forward_event (self, event);
+      break;
+  }
+
+  gst_object_unref (self);
+
+  return ret;
+}
+
+static gboolean
+gst_frei0r_mixer_sink0_event (GstPad * pad, GstEvent * event)
+{
+  GstFrei0rMixer *self = GST_FREI0R_MIXER (gst_pad_get_parent (pad));
+  gboolean ret = FALSE;
+
+  GST_DEBUG ("Got %s event on pad %s:%s", GST_EVENT_TYPE_NAME (event),
+      GST_DEBUG_PAD_NAME (pad));
+
+  switch (GST_EVENT_TYPE (event)) {
+    case GST_EVENT_NEWSEGMENT:
+      gst_event_replace (&self->newseg_event, event);
+      break;
+    default:
+      break;
+  }
+
+  /* now GstCollectPads can take care of the rest, e.g. EOS */
+  ret = self->collect_event (pad, event);
+
+  gst_object_unref (self);
+
+  return ret;
+}
+
+static GstFlowReturn
+gst_frei0r_mixer_collected (GstCollectPads * pads, GstFrei0rMixer * self)
+{
+  GstBuffer *inbuf0 = NULL, *inbuf1 = NULL, *inbuf2 = NULL;
+  GstBuffer *outbuf = NULL;
+  GstFlowReturn ret = GST_FLOW_OK;
+  GSList *l;
+  GstFrei0rMixerClass *klass = GST_FREI0R_MIXER_GET_CLASS (self);
+  gdouble time;
+
+  if (G_UNLIKELY (!self->f0r_instance))
+    return GST_FLOW_NOT_NEGOTIATED;
+
+  if (self->newseg_event) {
+    gst_pad_push_event (self->src, self->newseg_event);
+    self->newseg_event = NULL;
+  }
+
+  if ((ret =
+          gst_pad_alloc_buffer_and_set_caps (self->src, GST_BUFFER_OFFSET_NONE,
+              gst_video_format_get_size (self->fmt, self->width, self->height),
+              GST_PAD_CAPS (self->src), &outbuf)) != GST_FLOW_OK)
+    return ret;
+
+  for (l = pads->data; l; l = l->next) {
+    GstCollectData *cdata = l->data;
+
+    if (cdata->pad == self->sink0)
+      inbuf0 = gst_collect_pads_pop (pads, cdata);
+    else if (cdata->pad == self->sink1)
+      inbuf1 = gst_collect_pads_pop (pads, cdata);
+    else if (cdata->pad == self->sink2)
+      inbuf2 = gst_collect_pads_pop (pads, cdata);
+  }
+
+  if (!inbuf0 || !inbuf1 || (!inbuf2 && self->sink2))
+    goto eos;
+
+  gst_buffer_copy_metadata (outbuf, inbuf0,
+      GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS);
+  time = ((gdouble) GST_BUFFER_TIMESTAMP (outbuf)) / GST_SECOND;
+
+  klass->ftable->update2 (self->f0r_instance, time,
+      (const guint32 *) GST_BUFFER_DATA (inbuf0),
+      (const guint32 *) GST_BUFFER_DATA (inbuf1),
+      (inbuf2) ? (const guint32 *) GST_BUFFER_DATA (inbuf2) : NULL,
+      (guint32 *) GST_BUFFER_DATA (outbuf));
+
+  gst_buffer_unref (inbuf0);
+  gst_buffer_unref (inbuf1);
+  if (inbuf2)
+    gst_buffer_unref (inbuf2);
+
+  ret = gst_pad_push (self->src, outbuf);
+
+  return ret;
+
+eos:
+  {
+    GST_DEBUG_OBJECT (self, "no data available, must be EOS");
+    gst_buffer_unref (outbuf);
+
+    if (inbuf0)
+      gst_buffer_unref (inbuf0);
+    if (inbuf1)
+      gst_buffer_unref (inbuf1);
+    if (inbuf2)
+      gst_buffer_unref (inbuf2);
+
+    gst_pad_push_event (self->src, gst_event_new_eos ());
+    return GST_FLOW_UNEXPECTED;
+  }
+}
+
+static void
+gst_frei0r_mixer_class_init (GstFrei0rMixerClass * klass,
+    GstFrei0rMixerClassData * class_data)
+{
+  GObjectClass *gobject_class = (GObjectClass *) klass;
+  GstElementClass *gstelement_class = (GstElementClass *) klass;
+  GstPadTemplate *templ;
+  GstCaps *caps;
+  gchar *author;
+
+  klass->ftable = &class_data->ftable;
+  klass->info = &class_data->info;
+
+  gobject_class->finalize = gst_frei0r_mixer_finalize;
+  gobject_class->set_property = gst_frei0r_mixer_set_property;
+  gobject_class->get_property = gst_frei0r_mixer_get_property;
+
+  klass->n_properties = klass->info->num_params;
+  klass->properties = g_new0 (GstFrei0rProperty, klass->n_properties);
+
+  gst_frei0r_klass_install_properties (gobject_class, klass->ftable,
+      klass->properties, klass->n_properties);
+
+  author =
+      g_strdup_printf
+      ("Sebastian Dröge <sebastian.droege@collabora.co.uk>, %s",
+      class_data->info.author);
+  gst_element_class_set_details_simple (gstelement_class, class_data->info.name,
+      "Filter/Editor/Video", class_data->info.explanation, author);
+  g_free (author);
+
+  caps = gst_frei0r_caps_from_color_model (class_data->info.color_model);
+
+  templ =
+      gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
+      gst_caps_ref (caps));
+  gst_element_class_add_pad_template (gstelement_class, templ);
+
+  templ =
+      gst_pad_template_new ("sink_0", GST_PAD_SINK, GST_PAD_ALWAYS,
+      gst_caps_ref (caps));
+  gst_element_class_add_pad_template (gstelement_class, templ);
+
+  templ =
+      gst_pad_template_new ("sink_1", GST_PAD_SINK, GST_PAD_ALWAYS,
+      gst_caps_ref (caps));
+  gst_element_class_add_pad_template (gstelement_class, templ);
+
+  if (klass->info->plugin_type == F0R_PLUGIN_TYPE_MIXER3) {
+    templ =
+        gst_pad_template_new ("sink_2", GST_PAD_SINK, GST_PAD_ALWAYS,
+        gst_caps_ref (caps));
+    gst_element_class_add_pad_template (gstelement_class, templ);
+  }
+  gst_caps_unref (caps);
+
+  gstelement_class->change_state =
+      GST_DEBUG_FUNCPTR (gst_frei0r_mixer_change_state);
+}
+
+static void
+gst_frei0r_mixer_init (GstFrei0rMixer * self, GstFrei0rMixerClass * klass)
+{
+  self->property_cache =
+      gst_frei0r_property_cache_init (klass->properties, klass->n_properties);
+
+  self->collect = gst_collect_pads_new ();
+  gst_collect_pads_set_function (self->collect,
+      (GstCollectPadsFunction) gst_frei0r_mixer_collected, self);
+
+  self->src =
+      gst_pad_new_from_template (gst_element_class_get_pad_template
+      (GST_ELEMENT_CLASS (klass), "src"), "src");
+  gst_pad_set_getcaps_function (self->src,
+      GST_DEBUG_FUNCPTR (gst_frei0r_mixer_get_caps));
+  gst_pad_set_setcaps_function (self->src,
+      GST_DEBUG_FUNCPTR (gst_frei0r_mixer_set_caps));
+  gst_pad_set_query_function (self->src,
+      GST_DEBUG_FUNCPTR (gst_frei0r_mixer_src_query));
+  gst_pad_set_event_function (self->src,
+      GST_DEBUG_FUNCPTR (gst_frei0r_mixer_src_event));
+  gst_element_add_pad (GST_ELEMENT_CAST (self), self->src);
+
+  self->sink0 =
+      gst_pad_new_from_template (gst_element_class_get_pad_template
+      (GST_ELEMENT_CLASS (klass), "sink_0"), "sink_0");
+  gst_pad_set_getcaps_function (self->sink0,
+      GST_DEBUG_FUNCPTR (gst_frei0r_mixer_get_caps));
+  gst_pad_set_setcaps_function (self->sink0,
+      GST_DEBUG_FUNCPTR (gst_frei0r_mixer_set_caps));
+  gst_pad_set_query_function (self->sink0,
+      GST_DEBUG_FUNCPTR (gst_frei0r_mixer_sink_query));
+  gst_collect_pads_add_pad (self->collect, self->sink0,
+      sizeof (GstCollectData));
+  self->collect_event = (GstPadEventFunction) GST_PAD_EVENTFUNC (self->sink0);
+  gst_pad_set_event_function (self->sink0,
+      GST_DEBUG_FUNCPTR (gst_frei0r_mixer_sink0_event));
+  gst_element_add_pad (GST_ELEMENT_CAST (self), self->sink0);
+
+  self->sink1 =
+      gst_pad_new_from_template (gst_element_class_get_pad_template
+      (GST_ELEMENT_CLASS (klass), "sink_1"), "sink_1");
+  gst_pad_set_getcaps_function (self->sink1,
+      GST_DEBUG_FUNCPTR (gst_frei0r_mixer_get_caps));
+  gst_pad_set_setcaps_function (self->sink1,
+      GST_DEBUG_FUNCPTR (gst_frei0r_mixer_set_caps));
+  gst_pad_set_query_function (self->sink0,
+      GST_DEBUG_FUNCPTR (gst_frei0r_mixer_sink_query));
+  gst_collect_pads_add_pad (self->collect, self->sink1,
+      sizeof (GstCollectData));
+  gst_element_add_pad (GST_ELEMENT_CAST (self), self->sink1);
+
+  if (klass->info->plugin_type == F0R_PLUGIN_TYPE_MIXER3) {
+    self->sink2 =
+        gst_pad_new_from_template (gst_element_class_get_pad_template
+        (GST_ELEMENT_CLASS (klass), "sink_2"), "sink_2");
+    gst_pad_set_getcaps_function (self->sink2,
+        GST_DEBUG_FUNCPTR (gst_frei0r_mixer_get_caps));
+    gst_pad_set_setcaps_function (self->sink2,
+        GST_DEBUG_FUNCPTR (gst_frei0r_mixer_set_caps));
+    gst_pad_set_query_function (self->sink0,
+        GST_DEBUG_FUNCPTR (gst_frei0r_mixer_sink_query));
+    gst_collect_pads_add_pad (self->collect, self->sink2,
+        sizeof (GstCollectData));
+    gst_element_add_pad (GST_ELEMENT_CAST (self), self->sink2);
+  }
+
+}
+
+gboolean
+gst_frei0r_mixer_register (GstPlugin * plugin, const f0r_plugin_info_t * info,
+    const GstFrei0rFuncTable * ftable)
+{
+  GTypeInfo typeinfo = {
+    sizeof (GstFrei0rMixerClass),
+    NULL,
+    NULL,
+    (GClassInitFunc) gst_frei0r_mixer_class_init,
+    NULL,
+    NULL,
+    sizeof (GstFrei0rMixer),
+    0,
+    (GInstanceInitFunc) gst_frei0r_mixer_init
+  };
+  GType type;
+  gchar *type_name, *tmp;
+  GstFrei0rMixerClassData *class_data;
+
+  if (ftable->update2 == NULL)
+    return FALSE;
+
+  tmp = g_strdup_printf ("frei0r-mixer-%s", info->name);
+  type_name = g_ascii_strdown (tmp, -1);
+  g_free (tmp);
+  g_strcanon (type_name, G_CSET_A_2_Z G_CSET_a_2_z G_CSET_DIGITS "-+", '-');
+
+  if (g_type_from_name (type_name)) {
+    GST_WARNING ("Type '%s' already exists", type_name);
+    return FALSE;
+  }
+
+  if (!ftable->init ()) {
+    GST_ERROR ("Initializing plugin failed");
+    return FALSE;
+  }
+
+  class_data = g_new0 (GstFrei0rMixerClassData, 1);
+  memcpy (&class_data->info, info, sizeof (f0r_plugin_info_t));
+  memcpy (&class_data->ftable, ftable, sizeof (GstFrei0rFuncTable));
+  typeinfo.class_data = class_data;
+
+  type = g_type_register_static (GST_TYPE_ELEMENT, type_name, &typeinfo, 0);
+  return (gst_element_register (plugin, type_name, GST_RANK_NONE, type));
+}