A plugin to add an alpha channel to I420 video. Can optionally do chroma keying.

Original commit message from CVS:
* configure.ac:
* gst/alpha/Makefile.am:
* gst/alpha/gstalpha.c: (gst_alpha_method_get_type),
(gst_alpha_get_type), (gst_alpha_base_init),
(gst_alpha_class_init), (gst_alpha_init), (gst_alpha_set_property),
(gst_alpha_get_property), (gst_alpha_sink_link), (gst_alpha_add),
(gst_alpha_chroma_key), (gst_alpha_chain),
(gst_alpha_change_state), (plugin_init):
A plugin to add an alpha channel to I420 video. Can optionally do
chroma keying.
* gst/multipart/Makefile.am:
* gst/multipart/multipart.c: (plugin_init):
* gst/multipart/multipartdemux.c: (gst_multipart_demux_base_init),
(gst_multipart_demux_class_init), (gst_multipart_demux_init),
(gst_multipart_demux_finalize), (gst_multipart_demux_handle_event),
(gst_multipart_find_pad_by_mime), (gst_multipart_demux_chain),
(gst_multipart_demux_change_state),
(gst_multipart_demux_plugin_init):
* gst/multipart/multipartmux.c: (gst_multipart_mux_get_type),
(gst_multipart_mux_base_init), (gst_multipart_mux_class_init),
(gst_multipart_mux_get_sink_event_masks), (gst_multipart_mux_init),
(gst_multipart_mux_sinkconnect), (gst_multipart_mux_pad_link),
(gst_multipart_mux_pad_unlink),
(gst_multipart_mux_request_new_pad),
(gst_multipart_mux_handle_src_event),
(gst_multipart_mux_next_buffer), (gst_multipart_mux_compare_pads),
(gst_multipart_mux_queue_pads), (gst_multipart_mux_loop),
(gst_multipart_mux_get_property), (gst_multipart_mux_set_property),
(gst_multipart_mux_change_state), (gst_multipart_mux_plugin_init):
A Multipart demuxer/muxer. Not sure if it violates specs. Used to
send multipart jpeg images to a browser.
* gst/videobox/Makefile.am:
* gst/videobox/README:
* gst/videobox/gstvideobox.c: (gst_video_box_fill_get_type),
(gst_video_box_get_type), (gst_video_box_base_init),
(gst_video_box_class_init), (gst_video_box_init),
(gst_video_box_set_property), (gst_video_box_get_property),
(gst_video_box_sink_link), (gst_video_box_i420),
(gst_video_box_ayuv), (gst_video_box_chain),
(gst_video_box_change_state), (plugin_init):
Crops or adds borders around an image. can do alpha channel
borders as well.
* gst/videomixer/Makefile.am:
* gst/videomixer/README:
* gst/videomixer/videomixer.c: (gst_videomixer_pad_get_type),
(gst_videomixer_pad_base_init), (gst_videomixer_pad_class_init),
(gst_videomixer_pad_get_sink_event_masks),
(gst_videomixer_pad_get_property),
(gst_videomixer_pad_set_property),
(gst_videomixer_pad_sinkconnect), (gst_videomixer_pad_link),
(gst_videomixer_pad_unlink), (gst_videomixer_pad_init),
(gst_video_mixer_background_get_type), (gst_videomixer_get_type),
(gst_videomixer_base_init), (gst_videomixer_class_init),
(gst_videomixer_init), (gst_videomixer_request_new_pad),
(gst_videomixer_handle_src_event),
(gst_videomixer_blend_ayuv_i420), (gst_videomixer_fill_checker),
(gst_videomixer_fill_color), (gst_videomixer_fill_queues),
(gst_videomixer_blend_buffers), (gst_videomixer_update_queues),
(gst_videomixer_loop), (gst_videomixer_get_property),
(gst_videomixer_set_property), (gst_videomixer_change_state),
(plugin_init):
Generic video mixer plugin, can handle multiple inputs all with
different framerates and video sizes. Is fully alpha channel
aware.

1 files changed, 593 insertions, 0 deletions

diff --git a/gst/multipart/multipartmux.c b/gst/multipart/multipartmux.c
new file mode 100644
index 00000000..d4d96bc6
--- /dev/null
+++ b/gst/multipart/multipartmux.c
@@ -0,0 +1,593 @@
+/* multipart muxer plugin for GStreamer
+ * Copyright (C) 2004 Wim Taymans <wim@fluendo.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 <gst/gst.h>
+#include <string.h>
+
+GST_DEBUG_CATEGORY_STATIC (gst_multipart_mux_debug);
+#define GST_CAT_DEFAULT gst_multipart_mux_debug
+
+#define GST_TYPE_MULTIPART_MUX (gst_multipart_mux_get_type())
+#define GST_MULTIPART_MUX(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_MULTIPART_MUX, GstMultipartMux))
+#define GST_MULTIPART_MUX_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_MULTIPART_MUX, GstMultipartMux))
+#define GST_IS_MULTIPART_MUX(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_MULTIPART_MUX))
+#define GST_IS_MULTIPART_MUX_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_MULTIPART_MUX))
+
+typedef struct _GstMultipartMux GstMultipartMux;
+typedef struct _GstMultipartMuxClass GstMultipartMuxClass;
+
+/* all information needed for one multipart stream */
+typedef struct
+{
+  GstPad *pad;                  /* reference for this pad is held by element we belong to */
+
+  GstBuffer *buffer;            /* the queued buffer for this pad */
+
+  gboolean eos;
+  const gchar *mimetype;
+
+  guint state;                  /* state of the pad */
+}
+GstMultipartPad;
+
+struct _GstMultipartMux
+{
+  GstElement element;
+
+  /* pad */
+  GstPad *srcpad;
+
+  /* sinkpads, a GSList of GstMultipartPads */
+  GSList *sinkpads;
+  gint numpads;
+
+  /* the pad we are currently pulling from to fill a page */
+  GstMultipartPad *pulling;
+
+  /* next timestamp for the page */
+  GstClockTime next_ts;
+
+  /* offset in stream */
+  guint64 offset;
+};
+
+typedef enum
+{
+  GST_MULTIPART_FLAG_BOS = GST_ELEMENT_FLAG_LAST,
+  GST_MULTIPART_FLAG_EOS
+}
+GstMultipartFlag;
+
+struct _GstMultipartMuxClass
+{
+  GstElementClass parent_class;
+};
+
+/* elementfactory information */
+static GstElementDetails gst_multipart_mux_details =
+GST_ELEMENT_DETAILS ("multipart muxer",
+    "Codec/Muxer",
+    "mux multipart streams",
+    "Wim Taymans <wim@fluendo.com>");
+
+/* MultipartMux signals and args */
+enum
+{
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum
+{
+  ARG_0,
+};
+
+static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("multipart/x-mixed-replace")
+    );
+
+static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink_%d",
+    GST_PAD_SINK,
+    GST_PAD_REQUEST,
+    GST_STATIC_CAPS_ANY         /* we can take anything, really */
+    );
+
+static void gst_multipart_mux_base_init (gpointer g_class);
+static void gst_multipart_mux_class_init (GstMultipartMuxClass * klass);
+static void gst_multipart_mux_init (GstMultipartMux * multipart_mux);
+
+static void gst_multipart_mux_loop (GstElement * element);
+static gboolean gst_multipart_mux_handle_src_event (GstPad * pad,
+    GstEvent * event);
+static GstPad *gst_multipart_mux_request_new_pad (GstElement * element,
+    GstPadTemplate * templ, const gchar * name);
+static void gst_multipart_mux_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec);
+static void gst_multipart_mux_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec);
+static GstElementStateReturn gst_multipart_mux_change_state (GstElement *
+    element);
+
+static GstElementClass *parent_class = NULL;
+
+/*static guint gst_multipart_mux_signals[LAST_SIGNAL] = { 0 }; */
+
+GType
+gst_multipart_mux_get_type (void)
+{
+  static GType multipart_mux_type = 0;
+
+  if (!multipart_mux_type) {
+    static const GTypeInfo multipart_mux_info = {
+      sizeof (GstMultipartMuxClass),
+      gst_multipart_mux_base_init,
+      NULL,
+      (GClassInitFunc) gst_multipart_mux_class_init,
+      NULL,
+      NULL,
+      sizeof (GstMultipartMux),
+      0,
+      (GInstanceInitFunc) gst_multipart_mux_init,
+    };
+
+    multipart_mux_type =
+        g_type_register_static (GST_TYPE_ELEMENT, "GstMultipartMux",
+        &multipart_mux_info, 0);
+  }
+  return multipart_mux_type;
+}
+
+static void
+gst_multipart_mux_base_init (gpointer g_class)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
+
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&src_factory));
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&sink_factory));
+
+  gst_element_class_set_details (element_class, &gst_multipart_mux_details);
+}
+
+static void
+gst_multipart_mux_class_init (GstMultipartMuxClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gstelement_class = (GstElementClass *) klass;
+
+  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
+
+  gstelement_class->request_new_pad = gst_multipart_mux_request_new_pad;
+
+  gstelement_class->change_state = gst_multipart_mux_change_state;
+
+  gstelement_class->get_property = gst_multipart_mux_get_property;
+  gstelement_class->set_property = gst_multipart_mux_set_property;
+}
+
+static const GstEventMask *
+gst_multipart_mux_get_sink_event_masks (GstPad * pad)
+{
+  static const GstEventMask gst_multipart_mux_sink_event_masks[] = {
+    {GST_EVENT_EOS, 0},
+    {0,}
+  };
+
+  return gst_multipart_mux_sink_event_masks;
+}
+
+static void
+gst_multipart_mux_init (GstMultipartMux * multipart_mux)
+{
+  GstElementClass *klass = GST_ELEMENT_GET_CLASS (multipart_mux);
+
+  multipart_mux->srcpad =
+      gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
+          "src"), "src");
+  gst_pad_set_event_function (multipart_mux->srcpad,
+      gst_multipart_mux_handle_src_event);
+  gst_element_add_pad (GST_ELEMENT (multipart_mux), multipart_mux->srcpad);
+
+  GST_FLAG_SET (GST_ELEMENT (multipart_mux), GST_ELEMENT_EVENT_AWARE);
+  GST_FLAG_SET (GST_ELEMENT (multipart_mux), GST_MULTIPART_FLAG_BOS);
+
+  multipart_mux->sinkpads = NULL;
+  multipart_mux->pulling = NULL;
+
+  gst_element_set_loop_function (GST_ELEMENT (multipart_mux),
+      gst_multipart_mux_loop);
+}
+
+static GstPadLinkReturn
+gst_multipart_mux_sinkconnect (GstPad * pad, const GstCaps * vscaps)
+{
+  GstMultipartMux *multipart_mux;
+  GstMultipartPad *mppad;
+  GstStructure *structure;
+
+  multipart_mux = GST_MULTIPART_MUX (gst_pad_get_parent (pad));
+
+  mppad = (GstMultipartPad *) gst_pad_get_element_private (pad);
+
+  GST_DEBUG ("multipart_mux: sinkconnect triggered on %s",
+      gst_pad_get_name (pad));
+
+  structure = gst_caps_get_structure (vscaps, 0);
+  mppad->mimetype = gst_structure_get_name (structure);
+
+  return GST_PAD_LINK_OK;
+}
+
+static void
+gst_multipart_mux_pad_link (GstPad * pad, GstPad * peer, gpointer data)
+{
+  //GstMultipartMux *multipart_mux = GST_MULTIPART_MUX (data);
+  const gchar *padname = gst_pad_get_name (pad);
+
+  GST_DEBUG ("pad '%s' connected", padname);
+}
+
+static void
+gst_multipart_mux_pad_unlink (GstPad * pad, GstPad * peer, gpointer data)
+{
+  //GstMultipartMux *multipart_mux = GST_MULTIPART_MUX (data);
+  const gchar *padname = gst_pad_get_name (pad);
+
+  GST_DEBUG ("pad '%s' unlinked", padname);
+}
+
+static GstPad *
+gst_multipart_mux_request_new_pad (GstElement * element,
+    GstPadTemplate * templ, const gchar * req_name)
+{
+  GstMultipartMux *multipart_mux;
+  GstPad *newpad;
+  GstElementClass *klass = GST_ELEMENT_GET_CLASS (element);
+
+  g_return_val_if_fail (templ != NULL, NULL);
+
+  if (templ->direction != GST_PAD_SINK) {
+    g_warning ("multipart_mux: request pad that is not a SINK pad\n");
+    return NULL;
+  }
+
+  g_return_val_if_fail (GST_IS_MULTIPART_MUX (element), NULL);
+
+  multipart_mux = GST_MULTIPART_MUX (element);
+
+  if (templ == gst_element_class_get_pad_template (klass, "sink_%d")) {
+    gchar *name;
+
+    /* create new pad with the name */
+    name = g_strdup_printf ("sink_%02d", multipart_mux->numpads);
+    newpad = gst_pad_new_from_template (templ, name);
+    g_free (name);
+
+    /* construct our own wrapper data structure for the pad to
+     * keep track of its status */
+    {
+      GstMultipartPad *multipartpad = g_new0 (GstMultipartPad, 1);
+
+      multipartpad->pad = newpad;
+      multipartpad->eos = FALSE;
+
+      /* save a pointer to our data in the pad */
+      gst_pad_set_element_private (newpad, multipartpad);
+      /* store our data for the pad */
+      multipart_mux->sinkpads =
+          g_slist_prepend (multipart_mux->sinkpads, multipartpad);
+      multipart_mux->numpads++;
+    }
+  } else {
+    g_warning ("multipart_mux: this is not our template!\n");
+    return NULL;
+  }
+
+  g_signal_connect (newpad, "linked",
+      G_CALLBACK (gst_multipart_mux_pad_link), (gpointer) multipart_mux);
+  g_signal_connect (newpad, "unlinked",
+      G_CALLBACK (gst_multipart_mux_pad_unlink), (gpointer) multipart_mux);
+
+  /* setup some pad functions */
+  gst_pad_set_link_function (newpad, gst_multipart_mux_sinkconnect);
+  gst_pad_set_event_mask_function (newpad,
+      gst_multipart_mux_get_sink_event_masks);
+  /* dd the pad to the element */
+  gst_element_add_pad (element, newpad);
+
+  return newpad;
+}
+
+/* handle events */
+static gboolean
+gst_multipart_mux_handle_src_event (GstPad * pad, GstEvent * event)
+{
+  GstMultipartMux *multipart_mux;
+  GstEventType type;
+
+  multipart_mux = GST_MULTIPART_MUX (gst_pad_get_parent (pad));
+
+  type = event ? GST_EVENT_TYPE (event) : GST_EVENT_UNKNOWN;
+
+  switch (type) {
+    case GST_EVENT_SEEK:
+      /* disable seeking for now */
+      return FALSE;
+    default:
+      break;
+  }
+
+  return gst_pad_event_default (pad, event);
+}
+
+static GstBuffer *
+gst_multipart_mux_next_buffer (GstMultipartPad * pad)
+{
+  GstData *data = NULL;
+
+  while (data == NULL) {
+    GST_LOG ("muxer: pulling %s:%s\n", GST_DEBUG_PAD_NAME (pad->pad));
+    data = gst_pad_pull (pad->pad);
+    /* if it's an event, handle it */
+    if (GST_IS_EVENT (data)) {
+      GstEventType type;
+      GstMultipartMux *multipart_mux;
+      GstEvent *event = GST_EVENT (data);
+
+      multipart_mux = GST_MULTIPART_MUX (gst_pad_get_parent (pad->pad));
+      type = event ? GST_EVENT_TYPE (event) : GST_EVENT_UNKNOWN;
+
+      switch (type) {
+        case GST_EVENT_EOS:
+          return NULL;
+        default:
+          gst_pad_event_default (pad->pad, event);
+          break;
+      }
+      data = NULL;
+    }
+  }
+  return GST_BUFFER (data);
+}
+
+/*
+ * Given two pads, compare the buffers queued on it and return 0 if they have
+ * an equal priority, 1 if the new pad is better, -1 if the old pad is better 
+ */
+static gint
+gst_multipart_mux_compare_pads (GstMultipartMux * multipart_mux,
+    GstMultipartPad * old, GstMultipartPad * new)
+{
+  guint64 oldtime, newtime;
+
+  /* if the old pad doesn't contain anything or is even NULL, return 
+   * the new pad as best candidate and vice versa */
+  if (old == NULL || old->buffer == NULL)
+    return 1;
+  if (new == NULL || new->buffer == NULL)
+    return -1;
+
+  /* no timestamp on old buffer, it must go first */
+  oldtime = GST_BUFFER_TIMESTAMP (old->buffer);
+  if (oldtime == GST_CLOCK_TIME_NONE)
+    return -1;
+
+  /* no timestamp on new buffer, it must go first */
+  newtime = GST_BUFFER_TIMESTAMP (new->buffer);
+  if (newtime == GST_CLOCK_TIME_NONE)
+    return 1;
+
+  /* old buffer has higher timestamp, new one should go first */
+  if (newtime < oldtime)
+    return 1;
+  /* new buffer has higher timestamp, old one should go first */
+  else if (newtime > oldtime)
+    return -1;
+
+  /* same priority if all of the above failed */
+  return 0;
+}
+
+/* make sure a buffer is queued on all pads, returns a pointer to an multipartpad
+ * that holds the best buffer or NULL when no pad was usable */
+static GstMultipartPad *
+gst_multipart_mux_queue_pads (GstMultipartMux * multipart_mux)
+{
+  GstMultipartPad *bestpad = NULL;
+  GSList *walk;
+
+  /* try to make sure we have a buffer from each usable pad first */
+  walk = multipart_mux->sinkpads;
+  while (walk) {
+    GstMultipartPad *pad = (GstMultipartPad *) walk->data;
+
+    walk = walk->next;
+
+    /* try to get a new buffer for this pad if needed and possible */
+    if (pad->buffer == NULL && GST_PAD_IS_USABLE (pad->pad)) {
+      pad->buffer = gst_multipart_mux_next_buffer (pad);
+      /* no next buffer, try another pad */
+      if (pad->buffer == NULL)
+        continue;
+    }
+
+    /* skip unusable pads */
+    if (!GST_PAD_IS_USABLE (pad->pad))
+      continue;
+
+    /* we should have a buffer now, see if it is the best pad to
+     * pull on */
+    if (pad->buffer != NULL) {
+      if (gst_multipart_mux_compare_pads (multipart_mux, bestpad, pad) > 0) {
+        bestpad = pad;
+      }
+    }
+  }
+  return bestpad;
+}
+
+/* basic idea:
+ *
+ * 1) find a pad to pull on, this is done by pulling on all pads and
+ *    looking at the buffers to decide which one should be muxed first.
+ * 2) push buffer on best pad, go to 1
+ */
+static void
+gst_multipart_mux_loop (GstElement * element)
+{
+  GstMultipartMux *mux;
+
+  mux = GST_MULTIPART_MUX (element);
+
+  /* if we don't know which pad to pull on, find one */
+  if (mux->pulling == NULL) {
+    mux->pulling = gst_multipart_mux_queue_pads (mux);
+    /* remember timestamp of first buffer for this new pad */
+    if (mux->pulling != NULL) {
+      mux->next_ts = GST_BUFFER_TIMESTAMP (mux->pulling->buffer);
+    } else {
+      /* no pad to pull on, send EOS */
+      if (GST_PAD_IS_USABLE (mux->srcpad))
+        gst_pad_push (mux->srcpad, GST_DATA (gst_event_new (GST_EVENT_EOS)));
+      gst_element_set_eos (element);
+      return;
+    }
+  }
+
+  /* we are pulling from a pad, continue to do so until a page
+   * has been filled and pushed */
+  if (mux->pulling != NULL) {
+    GstBuffer *buf, *tmpbuf;
+    GstMultipartPad *pad = mux->pulling;
+    GstBuffer *newbuf;
+    gchar *header;
+    gint headerlen;
+
+    /* now see if we have a buffer */
+    buf = pad->buffer;
+    if (buf == NULL) {
+      /* no buffer, get one */
+      buf = gst_multipart_mux_next_buffer (pad);
+      /* data exhausted on this pad (EOS) */
+      if (buf == NULL) {
+        /* stop pulling from the pad */
+        mux->pulling = NULL;
+        return;
+      }
+    }
+
+    /* read ahead one more buffer to find EOS */
+    tmpbuf = gst_multipart_mux_next_buffer (pad);
+    /* data exhausted on this pad */
+    if (tmpbuf == NULL) {
+      /* stop pulling from the pad */
+      mux->pulling = NULL;
+    }
+
+    header = g_strdup_printf ("\n--ThisRandomString\nContent-type: %s\n\n",
+        pad->mimetype);
+    headerlen = strlen (header);
+    newbuf =
+        gst_pad_alloc_buffer (mux->srcpad, GST_BUFFER_OFFSET_NONE, headerlen);
+    GST_BUFFER_DATA (newbuf) = header;
+    GST_BUFFER_SIZE (newbuf) = headerlen;
+    GST_BUFFER_TIMESTAMP (newbuf) = GST_BUFFER_TIMESTAMP (buf);
+    gst_pad_push (mux->srcpad, GST_DATA (newbuf));
+    gst_pad_push (mux->srcpad, GST_DATA (buf));
+
+    /* store new readahead buffer */
+    pad->buffer = tmpbuf;
+
+    /* we're done pulling on this pad, make sure to choose a new 
+     * pad for pulling in the next iteration */
+    mux->pulling = NULL;
+  }
+}
+
+static void
+gst_multipart_mux_get_property (GObject * object,
+    guint prop_id, GValue * value, GParamSpec * pspec)
+{
+  switch (prop_id) {
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+gst_multipart_mux_set_property (GObject * object,
+    guint prop_id, const GValue * value, GParamSpec * pspec)
+{
+  switch (prop_id) {
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static GstElementStateReturn
+gst_multipart_mux_change_state (GstElement * element)
+{
+  GstMultipartMux *multipart_mux;
+  gint transition = GST_STATE_TRANSITION (element);
+
+  g_return_val_if_fail (GST_IS_MULTIPART_MUX (element), GST_STATE_FAILURE);
+
+  multipart_mux = GST_MULTIPART_MUX (element);
+
+  switch (transition) {
+    case GST_STATE_NULL_TO_READY:
+    case GST_STATE_READY_TO_PAUSED:
+      multipart_mux->next_ts = 0;
+      multipart_mux->offset = 0;
+      multipart_mux->pulling = NULL;
+      break;
+    case GST_STATE_PAUSED_TO_PLAYING:
+    case GST_STATE_PLAYING_TO_PAUSED:
+    case GST_STATE_PAUSED_TO_READY:
+    case GST_STATE_READY_TO_NULL:
+      break;
+  }
+
+  if (GST_ELEMENT_CLASS (parent_class)->change_state)
+    return GST_ELEMENT_CLASS (parent_class)->change_state (element);
+
+  return GST_STATE_SUCCESS;
+}
+
+gboolean
+gst_multipart_mux_plugin_init (GstPlugin * plugin)
+{
+  GST_DEBUG_CATEGORY_INIT (gst_multipart_mux_debug, "multipartmux", 0,
+      "multipart muxer");
+
+  return gst_element_register (plugin, "multipartmux", GST_RANK_PRIMARY,
+      GST_TYPE_MULTIPART_MUX);
+}