Small fixes in get_range and better structure for generic muxer and demuxer.

Original commit message from CVS:
Small fixes in get_range and better structure for generic muxer and demuxer.

1 files changed, 1544 insertions, 27 deletions

diff --git a/ext/metadata/gstmetadatamux.c b/ext/metadata/gstmetadatamux.c
index 556191b7..02bb99b6 100644
--- a/ext/metadata/gstmetadatamux.c
+++ b/ext/metadata/gstmetadatamux.c
@@ -42,13 +42,13 @@
  */
 
 /**
- * SECTION:element-plugin
+ * SECTION:metadatamux-metadata
  *
  * <refsect2>
  * <title>Example launch line</title>
  * <para>
  * <programlisting>
- * gst-launch -v -m filesrc location=./test.jpeg ! metadatamux ! filesink location=meta.jpeg
+ * gst-launch -v -m filesrc location=./test.jpeg ! metadatamux ! fakesink silent=TRUE
  * </programlisting>
  * </para>
  * </refsect2>
@@ -62,9 +62,20 @@
 
 #include "gstmetadatamux.h"
 
+#include "metadataexif.h"
+
+#include "metadataiptc.h"
+
+#include "metadataxmp.h"
+
+#include <string.h>
+
 GST_DEBUG_CATEGORY_STATIC (gst_metadata_mux_debug);
 #define GST_CAT_DEFAULT gst_metadata_mux_debug
 
+#define GOTO_DONE_IF_NULL(ptr) do { if ( NULL == (ptr) ) goto done; } while(FALSE)
+#define GOTO_DONE_IF_NULL_AND_FAIL(ptr, ret) do { if ( NULL == (ptr) ) { (ret) = FALSE; goto done; } } while(FALSE)
+
 /* Filter signals and args */
 enum
 {
@@ -75,6 +86,9 @@ enum
 enum
 {
   ARG_0,
+  ARG_EXIF,
+  ARG_IPTC,
+  ARG_XMP
 };
 
 static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
@@ -93,22 +107,79 @@ static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
 GST_BOILERPLATE (GstMetadataMux, gst_metadata_mux, GstElement,
     GST_TYPE_ELEMENT);
 
+static GstMetadataMuxClass *metadata_parent_class = NULL;
+
+static void gst_metadata_mux_dispose (GObject * object);
+
+static void gst_metadata_mux_finalize (GObject * object);
+
 static void gst_metadata_mux_set_property (GObject * object, guint prop_id,
     const GValue * value, GParamSpec * pspec);
 static void gst_metadata_mux_get_property (GObject * object, guint prop_id,
     GValue * value, GParamSpec * pspec);
 
+static GstStateChangeReturn
+gst_metadata_mux_change_state (GstElement * element, GstStateChange transition);
+
+static GstCaps *gst_metadata_mux_get_caps (GstPad * pad);
 static gboolean gst_metadata_mux_set_caps (GstPad * pad, GstCaps * caps);
+static gboolean gst_metadata_mux_src_event (GstPad * pad, GstEvent * event);
+static gboolean gst_metadata_mux_sink_event (GstPad * pad, GstEvent * event);
+
 static GstFlowReturn gst_metadata_mux_chain (GstPad * pad, GstBuffer * buf);
 
+static gboolean gst_metadata_mux_checkgetrange (GstPad * srcpad);
+
+static GstFlowReturn
+gst_metadata_mux_get_range (GstPad * pad, guint64 offset_orig, guint size,
+    GstBuffer ** buf);
+
+static gboolean gst_metadata_mux_sink_activate (GstPad * pad);
+
+static gboolean
+gst_metadata_mux_src_activate_pull (GstPad * pad, gboolean active);
+
+static gboolean gst_metadata_mux_pull_range_mux (GstMetadataMux * filter);
+
+static void gst_metadata_mux_init_members (GstMetadataMux * filter);
+static void gst_metadata_mux_dispose_members (GstMetadataMux * filter);
+
+static gboolean gst_metadata_mux_configure_srccaps (GstMetadataMux * filter);
+static gboolean gst_metadata_mux_configure_caps (GstMetadataMux * filter);
+
+static int
+gst_metadata_mux_mux (GstMetadataMux * filter, const guint8 * buf,
+    guint32 size);
+
+static void gst_metadata_mux_send_tags (GstMetadataMux * filter);
+
+
+
+static int
+gst_metadata_mux_get_strip_seg (const gint64 offset, guint32 size,
+    const gint64 seg_offset, const guint32 seg_size,
+    gint64 * boffset, guint32 * bsize, guint32 * seg_binter);
+
+static gboolean
+gst_metadata_mux_strip_push_buffer (GstMetadataMux * filter,
+    gint64 offset_orig, GstBuffer ** prepend, GstBuffer ** buf);
+
+static gboolean
+gst_metadata_mux_translate_pos_to_orig (GstMetadataMux * filter, gint64 pos,
+    gint64 * orig_pos, GstBuffer ** buf);
+
+static const GstQueryType *gst_metadata_mux_get_query_types (GstPad * pad);
+
+static gboolean gst_metadata_mux_src_query (GstPad * pad, GstQuery * query);
+
 static void
 gst_metadata_mux_base_init (gpointer gclass)
 {
   static GstElementDetails element_details = {
-    "PluginTemplate",
-    "Generic/PluginTemplate",
-    "Generic Template Element",
-    "Thomas Vander Stichele <thomas@apestaart.org>"
+    "Metadata muxer",
+    "Muxer/Metadata",
+    "Convert tags to metadata (EXIF, IPTC and XMP) and insert into the stream",
+    "Edgard Lima <edgard.lima@indt.org.br>"
   };
   GstElementClass *element_class = GST_ELEMENT_CLASS (gclass);
 
@@ -129,9 +200,27 @@ gst_metadata_mux_class_init (GstMetadataMuxClass * klass)
   gobject_class = (GObjectClass *) klass;
   gstelement_class = (GstElementClass *) klass;
 
+  metadata_parent_class = g_type_class_peek_parent (klass);
+
+  gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_metadata_mux_dispose);
+  gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_metadata_mux_finalize);
+
   gobject_class->set_property = gst_metadata_mux_set_property;
   gobject_class->get_property = gst_metadata_mux_get_property;
 
+  g_object_class_install_property (gobject_class, ARG_EXIF,
+      g_param_spec_boolean ("exif", "EXIF", "Send EXIF metadata ?",
+          TRUE, G_PARAM_READWRITE));
+
+  g_object_class_install_property (gobject_class, ARG_IPTC,
+      g_param_spec_boolean ("iptc", "IPTC", "Send IPTC metadata ?",
+          TRUE, G_PARAM_READWRITE));
+
+  g_object_class_install_property (gobject_class, ARG_XMP,
+      g_param_spec_boolean ("xmp", "XMP", "Send XMP metadata ?",
+          TRUE, G_PARAM_READWRITE));
+
+  gstelement_class->change_state = gst_metadata_mux_change_state;
 
 }
 
@@ -145,24 +234,49 @@ gst_metadata_mux_init (GstMetadataMux * filter, GstMetadataMuxClass * gclass)
 {
   GstElementClass *klass = GST_ELEMENT_GET_CLASS (filter);
 
+  /* sink pad */
+
   filter->sinkpad =
       gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
           "sink"), "sink");
   gst_pad_set_setcaps_function (filter->sinkpad,
       GST_DEBUG_FUNCPTR (gst_metadata_mux_set_caps));
   gst_pad_set_getcaps_function (filter->sinkpad,
-      GST_DEBUG_FUNCPTR (gst_pad_proxy_getcaps));
+      GST_DEBUG_FUNCPTR (gst_metadata_mux_get_caps));
+  gst_pad_set_event_function (filter->sinkpad, gst_metadata_mux_sink_event);
+  gst_pad_set_chain_function (filter->sinkpad,
+      GST_DEBUG_FUNCPTR (gst_metadata_mux_chain));
+  gst_pad_set_activate_function (filter->sinkpad,
+      gst_metadata_mux_sink_activate);
+
+  /* source pad */
 
   filter->srcpad =
       gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
           "src"), "src");
   gst_pad_set_getcaps_function (filter->srcpad,
-      GST_DEBUG_FUNCPTR (gst_pad_proxy_getcaps));
+      GST_DEBUG_FUNCPTR (gst_metadata_mux_get_caps));
+  gst_pad_set_event_function (filter->srcpad, gst_metadata_mux_src_event);
+  gst_pad_set_query_function (filter->srcpad,
+      GST_DEBUG_FUNCPTR (gst_metadata_mux_src_query));
+  gst_pad_set_query_type_function (filter->srcpad,
+      GST_DEBUG_FUNCPTR (gst_metadata_mux_get_query_types));
+  gst_pad_use_fixed_caps (filter->srcpad);
+
+  gst_pad_set_checkgetrange_function (filter->srcpad,
+      GST_DEBUG_FUNCPTR (gst_metadata_mux_checkgetrange));
+  gst_pad_set_getrange_function (filter->srcpad, gst_metadata_mux_get_range);
+
+  gst_pad_set_activatepull_function (filter->srcpad,
+      GST_DEBUG_FUNCPTR (gst_metadata_mux_src_activate_pull));
+  /* addind pads */
 
   gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
   gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
-  gst_pad_set_chain_function (filter->sinkpad,
-      GST_DEBUG_FUNCPTR (gst_metadata_mux_chain));
+
+  /* init members */
+
+  gst_metadata_mux_init_members (filter);
 
 }
 
@@ -173,6 +287,24 @@ gst_metadata_mux_set_property (GObject * object, guint prop_id,
   GstMetadataMux *filter = GST_METADATA_MUX (object);
 
   switch (prop_id) {
+    case ARG_EXIF:
+      if (g_value_get_boolean (value))
+        set_meta_option (filter->mux_data, META_OPT_EXIF);
+      else
+        unset_meta_option (filter->mux_data, META_OPT_EXIF);
+      break;
+    case ARG_IPTC:
+      if (g_value_get_boolean (value))
+        set_meta_option (filter->mux_data, META_OPT_IPTC);
+      else
+        unset_meta_option (filter->mux_data, META_OPT_IPTC);
+      break;
+    case ARG_XMP:
+      if (g_value_get_boolean (value))
+        set_meta_option (filter->mux_data, META_OPT_XMP);
+      else
+        unset_meta_option (filter->mux_data, META_OPT_XMP);
+      break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
@@ -186,6 +318,18 @@ gst_metadata_mux_get_property (GObject * object, guint prop_id,
   GstMetadataMux *filter = GST_METADATA_MUX (object);
 
   switch (prop_id) {
+    case ARG_EXIF:
+      g_value_set_boolean (value,
+          META_DATA_OPTION (filter->mux_data) & META_OPT_EXIF);
+      break;
+    case ARG_IPTC:
+      g_value_set_boolean (value,
+          META_DATA_OPTION (filter->mux_data) & META_OPT_IPTC);
+      break;
+    case ARG_XMP:
+      g_value_set_boolean (value,
+          META_DATA_OPTION (filter->mux_data) & META_OPT_XMP);
+      break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
@@ -194,49 +338,1422 @@ gst_metadata_mux_get_property (GObject * object, guint prop_id,
 
 /* GstElement vmethod implementations */
 
+static GstCaps *
+gst_metadata_mux_get_caps (GstPad * pad)
+{
+  GstMetadataMux *filter = NULL;
+  GstPad *otherpad;
+  GstCaps *caps_new = NULL;
+  GstCaps *caps_otherpad_peer = NULL;
+
+  filter = GST_METADATA_MUX (gst_pad_get_parent (pad));
+
+  (filter->srcpad == pad) ? (otherpad = filter->sinkpad) : (otherpad =
+      filter->srcpad);
+
+  caps_new = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
+
+  caps_otherpad_peer = gst_pad_get_allowed_caps (otherpad);
+  GOTO_DONE_IF_NULL (caps_otherpad_peer);
+
+  if (gst_caps_is_empty (caps_otherpad_peer)
+      || gst_caps_is_any (caps_otherpad_peer)) {
+    goto done;
+  } else {
+
+    guint i;
+    guint caps_size = 0;
+
+    caps_size = gst_caps_get_size (caps_otherpad_peer);
+
+    gst_caps_unref (caps_new);
+
+    caps_new = gst_caps_new_empty ();
+
+    for (i = 0; i < caps_size; ++i) {
+      GstStructure *structure = NULL;
+      GstStructure *structure_new = NULL;
+      const gchar *mime = NULL;
+
+      structure = gst_caps_get_structure (caps_otherpad_peer, i);
+
+      mime = gst_structure_get_name (structure);
+
+      if (pad == filter->sinkpad) {
+        structure_new =
+            gst_structure_new (mime, "tags-extracted", G_TYPE_BOOLEAN, FALSE,
+            NULL);
+      } else {
+        structure_new =
+            gst_structure_new (mime, "tags-extracted", G_TYPE_BOOLEAN, TRUE,
+            NULL);
+      }
+
+      gst_caps_append_structure (caps_new, structure_new);
+
+    }
+
+  }
+
+done:
+
+  if (caps_otherpad_peer) {
+    gst_caps_unref (caps_otherpad_peer);
+    caps_otherpad_peer = NULL;
+  }
+
+  gst_object_unref (filter);
+
+  return caps_new;
+
+}
+
+static gboolean
+gst_metadata_mux_src_event (GstPad * pad, GstEvent * event)
+{
+  GstMetadataMux *filter = NULL;
+  gboolean ret = FALSE;
+
+  filter = GST_METADATA_MUX (gst_pad_get_parent (pad));
+
+  switch (GST_EVENT_TYPE (event)) {
+    case GST_EVENT_SEEK:
+    {
+      gdouble rate;
+      GstFormat format;
+      GstSeekFlags flags;
+      GstSeekType start_type;
+      gint64 start;
+      GstSeekType stop_type;
+      gint64 stop;
+
+      /* we don't know where are the chunks to be stripped before mux */
+      if (filter->state != MT_STATE_MUXED)
+        goto done;
+
+      gst_event_parse_seek (event, &rate, &format, &flags,
+          &start_type, &start, &stop_type, &stop);
+
+      switch (format) {
+        case GST_FORMAT_BYTES:
+          break;
+        case GST_FORMAT_PERCENT:
+          if (filter->duration < 0)
+            goto done;
+          start = start * filter->duration / 100;
+          stop = stop * filter->duration / 100;
+          break;
+        default:
+          goto done;
+      }
+      format = GST_FORMAT_BYTES;
+
+      if (start_type == GST_SEEK_TYPE_CUR)
+        start = filter->offset + start;
+      else if (start_type == GST_SEEK_TYPE_END) {
+        if (filter->duration < 0)
+          goto done;
+        start = filter->duration + start;
+      }
+      start_type == GST_SEEK_TYPE_SET;
+
+      if (filter->prepend_buffer) {
+        gst_buffer_unref (filter->prepend_buffer);
+        filter->prepend_buffer = NULL;
+      }
+
+      /* FIXME: related to append */
+      filter->offset = start;
+      gst_metadata_mux_translate_pos_to_orig (filter, start, &start,
+          &filter->prepend_buffer);
+      filter->offset_orig = start;
+
+      if (stop_type == GST_SEEK_TYPE_CUR)
+        stop = filter->offset + stop;
+      else if (stop_type == GST_SEEK_TYPE_END) {
+        if (filter->duration < 0)
+          goto done;
+        stop = filter->duration + stop;
+      }
+      stop_type == GST_SEEK_TYPE_SET;
+
+      gst_metadata_mux_translate_pos_to_orig (filter, stop, &stop, NULL);
+
+      gst_event_unref (event);
+      event = gst_event_new_seek (rate, format, flags,
+          start_type, start, stop_type, stop);
+
+    }
+      break;
+    default:
+      break;
+  }
+
+  ret = gst_pad_event_default (pad, event);
+  event = NULL;                 /* event has another owner */
+
+done:
+
+  if (event) {
+    gst_event_unref (event);
+  }
+
+  gst_object_unref (filter);
+
+  return ret;
+
+}
+
+static gboolean
+gst_metadata_mux_sink_event (GstPad * pad, GstEvent * event)
+{
+  GstMetadataMux *filter = NULL;
+  gboolean ret = FALSE;
+
+  filter = GST_METADATA_MUX (gst_pad_get_parent (pad));
+
+  switch (GST_EVENT_TYPE (event)) {
+    case GST_EVENT_EOS:
+      if (filter->need_more_data) {
+        GST_ELEMENT_WARNING (filter, STREAM, DEMUX, (NULL),
+            ("Need more data. Unexpected EOS"));
+      }
+      break;
+    case GST_EVENT_TAG:
+      break;
+    default:
+      break;
+  }
+
+  ret = gst_pad_event_default (pad, event);
+
+  gst_object_unref (filter);
+
+  return ret;
+
+}
+
+static void
+gst_metadata_mux_dispose (GObject * object)
+{
+  GstMetadataMux *filter = NULL;
+
+  filter = GST_METADATA_MUX (object);
+
+  gst_metadata_mux_dispose_members (filter);
+
+  G_OBJECT_CLASS (metadata_parent_class)->dispose (object);
+}
+
+static void
+gst_metadata_mux_finalize (GObject * object)
+{
+  G_OBJECT_CLASS (metadata_parent_class)->finalize (object);
+}
+
+static void
+gst_metadata_mux_dispose_members (GstMetadataMux * filter)
+{
+  metadata_dispose (&filter->mux_data);
+
+  if (filter->adapter_parsing) {
+    gst_object_unref (filter->adapter_parsing);
+    filter->adapter_parsing = NULL;
+  }
+
+  if (filter->adapter_holding) {
+    gst_object_unref (filter->adapter_holding);
+    filter->adapter_holding = NULL;
+  }
+
+  if (filter->taglist) {
+    gst_tag_list_free (filter->taglist);
+    filter->taglist = NULL;
+  }
+
+  if (filter->append_buffer) {
+    gst_buffer_unref (filter->append_buffer);
+    filter->append_buffer = NULL;
+  }
+
+  if (filter->prepend_buffer) {
+    gst_buffer_unref (filter->prepend_buffer);
+    filter->prepend_buffer = NULL;
+  }
+}
+
+static void
+gst_metadata_mux_init_members (GstMetadataMux * filter)
+{
+  filter->need_send_tag = FALSE;
+  filter->exif = TRUE;
+  filter->iptc = TRUE;
+  filter->xmp = TRUE;
+
+  filter->taglist = NULL;
+  filter->adapter_parsing = NULL;
+  filter->adapter_holding = NULL;
+  filter->next_offset = 0;
+  filter->next_size = 0;
+  filter->img_type = IMG_NONE;
+  filter->offset_orig = 0;
+  filter->duration_orig = 0;
+  filter->offset = 0;
+  filter->duration = 0;
+  filter->state = MT_STATE_NULL;
+  filter->need_more_data = FALSE;
+
+  filter->append_buffer = NULL;
+  filter->prepend_buffer = NULL;
+
+  memset (&filter->mux_data, 0x00, sizeof (MetaData));
+}
+
+static gboolean
+gst_metadata_mux_configure_srccaps (GstMetadataMux * filter)
+{
+  GstCaps *caps = NULL;
+  gboolean ret = FALSE;
+  gchar *mime = NULL;
+
+  switch (filter->img_type) {
+    case IMG_JPEG:
+      mime = "image/jpeg";
+      break;
+    case IMG_PNG:
+      mime = "image/png";
+      break;
+    default:
+      ret = FALSE;
+      goto done;
+      break;
+  }
+
+  caps =
+      gst_caps_new_simple (mime, "tags-extracted", G_TYPE_BOOLEAN, TRUE, NULL);
+
+  ret = gst_pad_set_caps (filter->srcpad, caps);
+
+done:
+
+  if (caps) {
+    gst_caps_unref (caps);
+    caps = NULL;
+  }
+
+  return ret;
+
+}
+
+static gboolean
+gst_metadata_mux_configure_caps (GstMetadataMux * filter)
+{
+  GstCaps *caps = NULL;
+  gboolean ret = FALSE;
+  gchar *mime = NULL;
+  GstPad *peer = NULL;
+
+  peer = gst_pad_get_peer (filter->sinkpad);
+
+  switch (filter->img_type) {
+    case IMG_JPEG:
+      mime = "image/jpeg";
+      break;
+    case IMG_PNG:
+      mime = "image/png";
+      break;
+    default:
+      goto done;
+      break;
+  }
+
+  caps = gst_caps_new_simple (mime, NULL);
+
+  if (!gst_pad_set_caps (peer, caps)) {
+    goto done;
+  }
+
+  ret = gst_pad_set_caps (filter->sinkpad, caps);
+
+done:
+
+  if (caps) {
+    gst_caps_unref (caps);
+    caps = NULL;
+  }
+
+  if (peer) {
+    gst_object_unref (peer);
+    peer = NULL;
+  }
+
+  return ret;
+
+}
+
 /* this function handles the link with other elements */
 static gboolean
 gst_metadata_mux_set_caps (GstPad * pad, GstCaps * caps)
 {
-  GstMetadataMux *filter;
-  GstPad *otherpad;
+  GstMetadataMux *filter = NULL;
+  GstStructure *structure = NULL;
+  const gchar *mime = NULL;
+  gboolean ret = FALSE;
+  gboolean muxd = TRUE;
 
   filter = GST_METADATA_MUX (gst_pad_get_parent (pad));
-  otherpad = (pad == filter->srcpad) ? filter->sinkpad : filter->srcpad;
 
-  return gst_pad_set_caps (pad, caps);
+  structure = gst_caps_get_structure (caps, 0);
+
+  mime = gst_structure_get_name (structure);
+
+  if (strcmp (mime, "image/jpeg") == 0) {
+    filter->img_type = IMG_JPEG;
+  } else if (strcmp (mime, "image/png") == 0) {
+    filter->img_type = IMG_PNG;
+  } else {
+    ret = FALSE;
+    goto done;
+  }
+
+  if (gst_structure_get_boolean (structure, "tags-extracted", &muxd)) {
+    if (muxd == TRUE) {
+      ret = FALSE;
+      goto done;
+    }
+  }
+
+  ret = gst_metadata_mux_configure_srccaps (filter);
+
+done:
+
+  gst_object_unref (filter);
+
+  return ret;
+}
+
+static const gchar *
+gst_metadata_mux_get_type_name (int img_type)
+{
+  gchar *type_name = NULL;
+
+  switch (img_type) {
+    case IMG_JPEG:
+      type_name = "jpeg";
+      break;
+    case IMG_PNG:
+      type_name = "png";
+      break;
+    default:
+      type_name = "invalid type";
+      break;
+  }
+  return type_name;
+}
+
+static void
+gst_metadata_mux_send_tags (GstMetadataMux * filter)
+{
+
+  GstMessage *msg;
+  GstTagList *taglist;
+  GstEvent *event;
+
+  if (META_DATA_OPTION (filter->mux_data) & META_OPT_EXIF)
+    metadatamux_exif_create_chunk_from_tag_list (&filter->mux_data.exif_adapter,
+        filter->taglist);
+
+  if (META_DATA_OPTION (filter->mux_data) & META_OPT_IPTC)
+    metadatamux_iptc_create_chunk_from_tag_list (&filter->mux_data.iptc_adapter,
+        filter->taglist);
+
+  if (META_DATA_OPTION (filter->mux_data) & META_OPT_XMP)
+    metadatamux_xmp_create_chunk_from_tag_list (&filter->mux_data.exif_adapter,
+        filter->taglist);
+
+
+  if (!gst_tag_list_is_empty (filter->taglist)) {
+
+    taglist = gst_tag_list_copy (filter->taglist);
+    msg = gst_message_new_tag (GST_OBJECT (filter), taglist);
+    gst_element_post_message (GST_ELEMENT (filter), msg);
+
+    taglist = gst_tag_list_copy (filter->taglist);
+    event = gst_event_new_tag (taglist);
+    gst_pad_push_event (filter->srcpad, event);
+  }
+
+
+
+  filter->need_send_tag = FALSE;
+}
+
+static const GstQueryType *
+gst_metadata_mux_get_query_types (GstPad * pad)
+{
+  static const GstQueryType gst_metadata_mux_src_query_types[] = {
+    GST_QUERY_POSITION,
+    GST_QUERY_DURATION,
+    GST_QUERY_FORMATS,
+    0
+  };
+
+  return gst_metadata_mux_src_query_types;
+}
+
+static gboolean
+gst_metadata_mux_src_query (GstPad * pad, GstQuery * query)
+{
+  gboolean ret = FALSE;
+  GstFormat format;
+  GstMetadataMux *filter = GST_METADATA_MUX (gst_pad_get_parent (pad));
+
+  switch (GST_QUERY_TYPE (query)) {
+    case GST_QUERY_POSITION:
+      gst_query_parse_position (query, &format, NULL);
+
+      if (format == GST_FORMAT_BYTES) {
+        gst_query_set_position (query, GST_FORMAT_BYTES, filter->offset);
+        ret = TRUE;
+      }
+      break;
+    case GST_QUERY_DURATION:
+      if (filter->state != MT_STATE_MUXED)
+        goto done;
+
+      gst_query_parse_duration (query, &format, NULL);
+
+      if (format == GST_FORMAT_BYTES) {
+        if (filter->duration >= 0) {
+          gst_query_set_duration (query, GST_FORMAT_BYTES, filter->duration);
+          ret = TRUE;
+        }
+      }
+      break;
+    case GST_QUERY_FORMATS:
+      gst_query_set_formats (query, 1, GST_FORMAT_BYTES);
+      ret = TRUE;
+      break;
+    default:
+      break;
+  }
+
+done:
+
+  gst_object_unref (filter);
+
+  return ret;
+
+}
+
+/*
+ * return:
+ *   -1 -> error
+ *    0 -> succeded
+ *    1 -> need more data
+ */
+
+static int
+gst_metadata_mux_mux (GstMetadataMux * filter, const guint8 * buf, guint32 size)
+{
+
+  int ret = -1;
+
+  filter->next_offset = 0;
+  filter->next_size = 0;
+
+  ret = metadata_parse (&filter->mux_data, buf, size,
+      &filter->next_offset, &filter->next_size);
+
+  if (ret < 0) {
+    if (META_DATA_IMG_TYPE (filter->mux_data) == IMG_NONE) {
+      /* image type not recognized */
+      GST_ELEMENT_ERROR (filter, STREAM, TYPE_NOT_FOUND, (NULL),
+          ("Only jpeg and png are supported"));
+      goto done;
+    }
+  } else if (ret > 0) {
+    filter->need_more_data = TRUE;
+  } else {
+    int i, j;
+    guint32 append_size;
+    guint32 bytes_striped, bytes_inject;
+    MetadataChunk *strip = filter->mux_data.strip_chunks.chunk;
+    MetadataChunk *inject = filter->mux_data.inject_chunks.chunk;
+    const gsize strip_len = filter->mux_data.strip_chunks.len;
+    const gsize inject_len = filter->mux_data.inject_chunks.len;
+
+    bytes_striped = 0;
+    bytes_inject = 0;
+
+    /* calculate the new position off injected chunks */
+    for (i = 0; i < inject_len; ++i) {
+      for (j = 0; j < strip_len; ++i) {
+        if (strip[j].offset_orig >= inject[i].offset_orig) {
+          break;
+        }
+        inject[i].offset = inject[i].offset_orig - bytes_striped + bytes_inject;
+        bytes_striped += strip[j].size;
+      }
+      bytes_inject += inject[i].size;
+    }
+
+    /* calculate append (doesnt make much sense, but, anyway..) */
+    append_size = 0;
+    for (i = inject_len - 1; i >= 0; --i) {
+      if (inject[i].offset_orig == filter->duration_orig)
+        append_size += inject[i].size;
+      else
+        break;
+    }
+    if (append_size) {
+      guint8 *data;
+
+      filter->append_buffer = gst_buffer_new_and_alloc (append_size);
+      GST_BUFFER_FLAG_SET (filter->append_buffer, GST_BUFFER_FLAG_READONLY);
+      data = GST_BUFFER_DATA (filter->append_buffer);
+      for (i = inject_len - 1; i >= 0; --i) {
+        if (inject[i].offset_orig == filter->duration_orig) {
+          memcpy (data, inject[i].data, inject[i].size);
+          data += inject[i].size;
+        } else {
+          break;
+        }
+      }
+    }
+
+    filter->state = MT_STATE_MUXED;
+    filter->need_more_data = FALSE;
+    filter->need_send_tag = TRUE;
+  }
+
+  if (filter->img_type != META_DATA_IMG_TYPE (filter->mux_data)) {
+    filter->img_type = META_DATA_IMG_TYPE (filter->mux_data);
+    if (!gst_metadata_mux_configure_caps (filter)) {
+      GST_ELEMENT_ERROR (filter, STREAM, FORMAT, (NULL),
+          ("Couldn't reconfigure caps for %s",
+              gst_metadata_mux_get_type_name (filter->img_type)));
+      ret = -1;
+      goto done;
+    }
+  }
+
+done:
+
+  return ret;
+
 }
 
 /* chain function
  * this function does the actual processing
  */
 
+/* FIXME */
+/* Current mux is just done before is pull mode could be activated */
+/* may be it is possible to mux in chain mode by doing some trick with gst-adapter */
+/* the pipeline below would be a test for that case */
+/* gst-launch-0.10 filesrc location=Exif.jpg ! queue !  metadatamux ! filesink location=gen3.jpg */
+
 static GstFlowReturn
 gst_metadata_mux_chain (GstPad * pad, GstBuffer * buf)
 {
-  GstMetadataMux *filter;
+  GstMetadataMux *filter = NULL;
+  GstFlowReturn ret = GST_FLOW_ERROR;
+  guint32 buf_size = 0;
+  guint32 new_buf_size = 0;
+  gboolean append = FALSE;
+
+  filter = GST_METADATA_MUX (gst_pad_get_parent (pad));
+
+  if (filter->state != MT_STATE_MUXED) {
+    guint32 adpt_size = gst_adapter_available (filter->adapter_parsing);
+
+    if (filter->next_offset) {
+      if (filter->next_offset >= adpt_size) {
+        /* clean adapter */
+        gst_adapter_clear (filter->adapter_parsing);
+        filter->next_offset -= adpt_size;
+        if (filter->next_offset >= GST_BUFFER_SIZE (buf)) {
+          /* we don't need data in this buffer */
+          filter->next_offset -= GST_BUFFER_SIZE (buf);
+        } else {
+          GstBuffer *new_buf;
+
+          /* add to adapter just need part from buf */
+          new_buf =
+              gst_buffer_new_and_alloc (GST_BUFFER_SIZE (buf) -
+              filter->next_offset);
+          memcpy (GST_BUFFER_DATA (new_buf),
+              GST_BUFFER_DATA (buf) + filter->next_offset,
+              GST_BUFFER_SIZE (buf) - filter->next_offset);
+          filter->next_offset = 0;
+          gst_adapter_push (filter->adapter_parsing, new_buf);
+        }
+      } else {
+        /* remove first bytes and add buffer */
+        gst_adapter_flush (filter->adapter_parsing, filter->next_offset);
+        filter->next_offset = 0;
+        gst_adapter_push (filter->adapter_parsing, gst_buffer_copy (buf));
+      }
+    } else {
+      /* just push buffer */
+      gst_adapter_push (filter->adapter_parsing, gst_buffer_copy (buf));
+    }
+
+    adpt_size = gst_adapter_available (filter->adapter_parsing);
+
+    if (adpt_size && filter->next_size <= adpt_size) {
+      const guint8 *new_buf =
+          gst_adapter_peek (filter->adapter_parsing, adpt_size);
+
+      if (gst_metadata_mux_mux (filter, new_buf, adpt_size) < 0)
+        goto done;
+    }
+  }
+
+  if (filter->state == MT_STATE_MUXED) {
+
+    if (filter->adapter_holding) {
+      gst_adapter_push (filter->adapter_holding, buf);
+      buf = gst_adapter_take_buffer (filter->adapter_holding,
+          gst_adapter_available (filter->adapter_holding));
+      g_object_unref (filter->adapter_holding);
+      filter->adapter_holding = NULL;
+    }
+
+    if (filter->need_send_tag) {
+      gst_metadata_mux_send_tags (filter);
+    }
+
+    if (filter->offset_orig + GST_BUFFER_SIZE (buf) == filter->duration_orig)
+      append = TRUE;
+
+    buf_size = GST_BUFFER_SIZE (buf);
+
+    gst_metadata_mux_strip_push_buffer (filter, filter->offset_orig,
+        &filter->prepend_buffer, &buf);
+
+    if (buf) {                  /* may be all buffer has been striped */
+      gst_buffer_set_caps (buf, GST_PAD_CAPS (filter->srcpad));
+      new_buf_size = GST_BUFFER_SIZE (buf);
+
+      ret = gst_pad_push (filter->srcpad, buf);
+      buf = NULL;               /* this function don't owner it anymore */
+      if (ret != GST_FLOW_OK)
+        goto done;
+    } else {
+      ret = GST_FLOW_OK;
+    }
 
-  filter = GST_METADATA_MUX (GST_OBJECT_PARENT (pad));
+    if (append && filter->append_buffer) {
+      gst_buffer_set_caps (filter->append_buffer,
+          GST_PAD_CAPS (filter->srcpad));
+      gst_buffer_ref (filter->append_buffer);
+      ret = gst_pad_push (filter->srcpad, filter->append_buffer);
+      if (ret != GST_FLOW_OK)
+        goto done;
+    }
+
+    filter->offset_orig += buf_size;
+    filter->offset += new_buf_size;
+
+  } else {
+    /* just store while still not muxd */
+    if (!filter->adapter_holding)
+      filter->adapter_holding = gst_adapter_new ();
+    gst_adapter_push (filter->adapter_holding, buf);
+    buf = NULL;
+    ret = GST_FLOW_OK;
+  }
+
+done:
+
+
+  if (buf) {
+    /* there was an error and buffer wasn't pushed */
+    gst_buffer_unref (buf);
+    buf = NULL;
+  }
+
+  gst_object_unref (filter);
+
+  return ret;
 
-  /* just push out the incoming buffer without touching it */
-  return gst_pad_push (filter->srcpad, buf);
 }
 
+static gboolean
+gst_metadata_mux_pull_range_mux (GstMetadataMux * filter)
+{
+
+  int res;
+  gboolean ret = TRUE;
+  guint32 offset = 0;
+  gint64 duration = 0;
+  GstFormat format = GST_FORMAT_BYTES;
+
+  if (!(ret =
+          gst_pad_query_peer_duration (filter->sinkpad, &format, &duration))) {
+    /* this should never happen, but try chain anyway */
+    ret = TRUE;
+    goto done;
+  }
+  if (format != GST_FORMAT_BYTES) {
+    /* this should never happen, but try chain anyway */
+    ret = TRUE;
+    goto done;
+  }
+
+  do {
+    GstFlowReturn flow;
+    GstBuffer *buf = NULL;
 
-/* entry point to initialize the plug-in
- * initialize the plug-in itself
- * register the element factories and pad templates
- * register the features
+    offset += filter->next_offset;
+
+    if (filter->next_size < 4096) {
+      if (duration - offset < 4096) {
+        filter->next_size = duration - offset;
+      } else {
+        filter->next_size = 4096;
+      }
+    }
+
+    flow =
+        gst_pad_pull_range (filter->sinkpad, offset, filter->next_size, &buf);
+    if (GST_FLOW_OK != flow) {
+      ret = FALSE;
+      goto done;
+    }
+
+    res =
+        gst_metadata_mux_mux (filter, GST_BUFFER_DATA (buf),
+        GST_BUFFER_SIZE (buf));
+    if (res < 0) {
+      ret = FALSE;
+      goto done;
+    }
+
+    gst_buffer_unref (buf);
+
+  } while (res > 0);
+
+  if (res == 0) {
+    int i;
+    MetadataChunk *strip = filter->mux_data.strip_chunks.chunk;
+    MetadataChunk *inject = filter->mux_data.inject_chunks.chunk;
+    const gsize strip_len = filter->mux_data.strip_chunks.len;
+    const gsize inject_len = filter->mux_data.inject_chunks.len;
+
+    filter->duration = duration;
+    filter->duration_orig = duration;
+
+    for (i = 0; i < inject_len; ++i) {
+      filter->duration += inject[i].size;
+    }
+    for (i = 0; i < strip_len; ++i) {
+      filter->duration -= strip[i].size;
+    }
+
+  }
+
+done:
+
+  return ret;
+
+}
+
+static gboolean
+gst_metadata_mux_sink_activate (GstPad * pad)
+{
+  GstMetadataMux *filter = NULL;
+  gboolean ret = TRUE;
+
+
+  filter = GST_METADATA_MUX (GST_PAD_PARENT (pad));
+
+  if (!gst_pad_check_pull_range (pad) ||
+      !gst_pad_activate_pull (filter->sinkpad, TRUE)) {
+    /* FIXME: currently it is not possible to mux in chain. Fail here ? */
+    /* nothing to be done by now, activate push mode */
+    return gst_pad_activate_push (pad, TRUE);
+  }
+
+  /* try to mux */
+  if (filter->state == MT_STATE_NULL) {
+    ret = gst_metadata_mux_pull_range_mux (filter);
+  }
+
+done:
+
+  if (ret) {
+    gst_pad_activate_pull (pad, FALSE);
+    gst_pad_activate_push (filter->srcpad, FALSE);
+    if (!gst_pad_is_active (pad)) {
+      ret = gst_pad_activate_push (filter->srcpad, TRUE);
+      ret = ret && gst_pad_activate_push (pad, TRUE);
+    }
+  }
+
+  return ret;
+
+}
+
+/*
+ * offset - offset of buffer in original stream
+ * size - size of buffer
+ * seg_offset - offset of segment in original stream
+ * seg_size - size of segment
+ * boffset - offset inside buffer where segment starts (-1 for no intersection)
+ * bsize - size of intersection
+ * seg_binter - if segment start inside buffer is zero. if segment start before
+ *               buffer and intersect, it is the offset inside segment.
  *
- * exchange the string 'plugin' with your elemnt name
+ * ret:
+ *  -1 - segment before buffer
+ *   0 - segment intersects
+ *   1 - segment after buffer
+ */
+
+static int
+gst_metadata_mux_get_strip_seg (const gint64 offset, guint32 size,
+    const gint64 seg_offset, const guint32 seg_size,
+    gint64 * boffset, guint32 * bsize, guint32 * seg_binter)
+{
+  int ret = -1;
+
+  *boffset = -1;
+  *bsize = 0;
+  *seg_binter = -1;
+
+  /* all segment after buffer */
+  if (seg_offset >= offset + size) {
+    ret = 1;
+    goto done;
+  }
+
+  if (seg_offset < offset) {
+    /* segment start somewhere before buffer */
+
+    /* all segment before buffer */
+    if (seg_offset + seg_size <= offset) {
+      ret = -1;
+      goto done;
+    }
+
+    *seg_binter = offset - seg_offset;
+    *boffset = 0;
+
+    /* FIXME : optimize to >= size -> = size */
+    if (seg_offset + seg_size >= offset + size) {
+      /* segment cover all buffer */
+      *bsize = size;
+    } else {
+      /* segment goes from start of buffer to somewhere before end */
+      *bsize = seg_size - *seg_binter;
+    }
+
+    ret = 0;
+
+  } else {
+    /* segment start somewhere into buffer */
+
+    *boffset = seg_offset - offset;
+    *seg_binter = 0;
+
+    if (seg_offset + seg_size <= offset + size) {
+      /* all segment into buffer */
+      *bsize = seg_size;
+    } else {
+      *bsize = size - *boffset;
+    }
+
+    ret = 0;
+
+  }
+
+done:
+
+  return ret;
+
+}
+
+/*
+ *  TRUE -> buffer striped or injeted
+ *  FALSE -> buffer unmodified
  */
+
+static gboolean
+gst_metadata_mux_strip_push_buffer (GstMetadataMux * filter,
+    gint64 offset_orig, GstBuffer ** prepend, GstBuffer ** buf)
+{
+  MetadataChunk *strip = filter->mux_data.strip_chunks.chunk;
+  MetadataChunk *inject = filter->mux_data.inject_chunks.chunk;
+  const gsize strip_len = filter->mux_data.strip_chunks.len;
+  const gsize inject_len = filter->mux_data.inject_chunks.len;
+
+  guint32 size_buf_in = GST_BUFFER_SIZE (*buf);
+
+  gint64 *boffset_strip = NULL;
+  guint32 *bsize_strip = NULL;
+  guint32 *seg_binter_strip = NULL;
+
+  int i, j;
+  gboolean need_free_strip = FALSE;
+
+  guint32 striped_bytes = 0;
+  guint32 injected_bytes = 0;
+
+  guint32 prepend_size = prepend && *prepend ? GST_BUFFER_SIZE (*prepend) : 0;
+
+  if (inject_len) {
+
+    for (i = 0; i < inject_len; ++i) {
+      int res;
+
+      if (inject[i].offset_orig >= offset_orig) {
+        if (inject[i].offset_orig < offset_orig + size_buf_in) {
+          injected_bytes += inject[i].size;
+        } else {
+          /* segment is after size (segments are sorted) */
+          break;
+        }
+      }
+    }
+
+  }
+
+  /*
+   * strip segments
+   */
+
+  if (strip_len == 0)
+    goto inject;
+
+  if (G_UNLIKELY (strip_len > 16)) {
+    boffset_strip = g_new (gint64, strip_len);
+    bsize_strip = g_new (guint32, strip_len);
+    seg_binter_strip = g_new (guint32, strip_len);
+    need_free_strip = TRUE;
+  } else {
+    boffset_strip = g_alloca (sizeof (boffset_strip[0]) * strip_len);
+    bsize_strip = g_alloca (sizeof (bsize_strip[0]) * strip_len);
+    seg_binter_strip = g_alloca (sizeof (seg_binter_strip[0]) * strip_len);
+  }
+
+  memset (bsize_strip, 0x00, sizeof (bsize_strip[0]) * strip_len);
+
+  for (i = 0; i < strip_len; ++i) {
+    int res;
+
+    res = gst_metadata_mux_get_strip_seg (offset_orig, size_buf_in,
+        strip[i].offset_orig, strip[i].size, &boffset_strip[i], &bsize_strip[i],
+        &seg_binter_strip[i]);
+
+    /* segment is after size (segments are sorted) */
+    striped_bytes += bsize_strip[i];
+    if (res > 0) {
+      break;
+    }
+
+  }
+
+  if (striped_bytes) {
+
+    guint8 *data;
+
+    if (injected_bytes + prepend_size > striped_bytes) {
+      GstBuffer *new_buf =
+          gst_buffer_new_and_alloc (GST_BUFFER_SIZE (*buf) + injected_bytes +
+          prepend_size - striped_bytes);
+
+      memcpy (GST_BUFFER_DATA (new_buf), GST_BUFFER_DATA (*buf),
+          GST_BUFFER_SIZE (*buf));
+
+      gst_buffer_unref (*buf);
+      *buf = new_buf;
+
+    } else if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_READONLY)) {
+      GstBuffer *new_buf = gst_buffer_copy (*buf);
+
+      gst_buffer_unref (*buf);
+      *buf = new_buf;
+      GST_BUFFER_FLAG_UNSET (*buf, GST_BUFFER_FLAG_READONLY);
+      GST_BUFFER_SIZE (*buf) += injected_bytes + prepend_size - striped_bytes;
+    }
+
+    data = GST_BUFFER_DATA (*buf);
+
+    striped_bytes = 0;
+    for (i = 0; i < strip_len; ++i) {
+      /* intersect */
+      if (bsize_strip[i]) {
+        memmove (data + boffset_strip[i] - striped_bytes,
+            data + boffset_strip[i] + bsize_strip[i] - striped_bytes,
+            size_buf_in - boffset_strip[i] - bsize_strip[i]);
+        striped_bytes += bsize_strip[i];
+      }
+    }
+    size_buf_in -= striped_bytes;
+
+  }
+
+inject:
+
+  /*
+   * inject segments
+   */
+
+  if (inject_len) {
+
+    guint8 *data;
+    guint32 striped_so_far;
+
+    if (injected_bytes + prepend_size > striped_bytes) {
+      GstBuffer *new_buf =
+          gst_buffer_new_and_alloc (GST_BUFFER_SIZE (*buf) + injected_bytes +
+          prepend_size - striped_bytes);
+
+      memcpy (GST_BUFFER_DATA (new_buf), GST_BUFFER_DATA (*buf),
+          GST_BUFFER_SIZE (*buf));
+
+      gst_buffer_unref (*buf);
+      *buf = new_buf;
+
+    } else if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_READONLY)) {
+      GstBuffer *new_buf = gst_buffer_copy (*buf);
+
+      gst_buffer_unref (*buf);
+      *buf = new_buf;
+      GST_BUFFER_FLAG_UNSET (*buf, GST_BUFFER_FLAG_READONLY);
+      GST_BUFFER_SIZE (*buf) += injected_bytes + prepend_size - striped_bytes;
+    }
+
+    data = GST_BUFFER_DATA (*buf);
+
+    injected_bytes = 0;
+    striped_so_far = 0;
+    j = 0;
+    for (i = 0; i < inject_len; ++i) {
+      int res;
+
+      while (j < strip_len) {
+        if (strip[j].offset_orig < inject[i].offset_orig)
+          striped_so_far += bsize_strip[j++];
+        else
+          break;
+      }
+
+      if (inject[i].offset_orig >= offset_orig) {
+        if (inject[i].offset_orig < offset_orig + size_buf_in + striped_bytes) {
+          /* insert */
+          guint32 buf_off =
+              inject[i].offset_orig - offset_orig - striped_so_far +
+              injected_bytes;
+          memmove (data + buf_off + inject[i].size, data + buf_off,
+              size_buf_in - buf_off);
+          memcpy (data + buf_off, inject[i].data, inject[i].size);
+          injected_bytes += inject[i].size;
+          size_buf_in += injected_bytes;
+        } else {
+          /* segment is after size (segments are sorted) */
+          break;
+        }
+      }
+    }
+
+  }
+
+
+done:
+
+  if (prepend_size) {
+    if (injected_bytes == 0 && striped_bytes == 0) {
+      GstBuffer *new_buf =
+          gst_buffer_new_and_alloc (size_buf_in + prepend_size);
+
+      memcpy (GST_BUFFER_DATA (new_buf) + prepend_size, GST_BUFFER_DATA (*buf),
+          size_buf_in);
+
+      gst_buffer_unref (*buf);
+      *buf = new_buf;
+    } else {
+      memmove (GST_BUFFER_DATA (*buf) + prepend_size, GST_BUFFER_DATA (*buf),
+          size_buf_in);
+    }
+    memcpy (GST_BUFFER_DATA (*buf), GST_BUFFER_DATA (*prepend), prepend_size);
+    gst_buffer_unref (*prepend);
+    *prepend = NULL;
+  }
+
+  GST_BUFFER_SIZE (*buf) = size_buf_in + prepend_size;
+
+  if (need_free_strip) {
+    g_free (boffset_strip);
+    g_free (bsize_strip);
+    g_free (seg_binter_strip);
+  }
+
+  return injected_bytes || striped_bytes;
+
+}
+
+/*
+ * pos - position in stream striped
+ * orig_pos - position in original stream
+ * return TRUE - position in original buffer
+ *        FALSE - position in inserted chunk
+ */
+static gboolean
+gst_metadata_mux_translate_pos_to_orig (GstMetadataMux * filter, gint64 pos,
+    gint64 * orig_pos, GstBuffer ** buf)
+{
+  int i;
+  MetadataChunk *strip = filter->mux_data.strip_chunks.chunk;
+  MetadataChunk *inject = filter->mux_data.inject_chunks.chunk;
+  const gsize strip_len = filter->mux_data.strip_chunks.len;
+  const gsize inject_len = filter->mux_data.inject_chunks.len;
+  gboolean ret = TRUE;
+  guint64 new_buf_size = 0;
+  guint64 injected_before = 0;
+
+  if (G_UNLIKELY (pos == -1)) {
+    *orig_pos = -1;
+    return TRUE;
+  } else if (G_UNLIKELY (pos >= filter->duration)) {
+    /* this should never happen */
+    *orig_pos = filter->duration_orig;
+    return TRUE;
+  }
+
+  /* calculate for injected */
+
+  /* just calculate size */
+  *orig_pos = pos;              /* save pos */
+  for (i = 0; i < inject_len; ++i) {
+    /* check if pos in inside chunk */
+    if (inject[i].offset <= pos) {
+      if (pos < inject[i].offset + inject[i].size) {
+        /* orig pos points after insert chunk */
+        new_buf_size += inject[i].size;
+        /* put pos after current chunk */
+        pos = inject[i].offset + inject[i].size;
+        ret = FALSE;
+      } else {
+        /* in case pos is not inside a injected chunk */
+        injected_before += inject[i].size;
+      }
+    } else {
+      break;
+    }
+  }
+
+  /* alloc buffer and calcute original pos */
+  if (buf && ret == FALSE) {
+    guint8 *data;
+
+    if (*buf)
+      gst_buffer_unref (*buf);
+    *buf = gst_buffer_new_and_alloc (new_buf_size);
+    data = GST_BUFFER_DATA (*buf);
+    pos = *orig_pos;            /* recover saved pos */
+    for (i = 0; i < inject_len; ++i) {
+      if (inject[i].offset > pos) {
+        break;
+      }
+      if (inject[i].offset <= pos && pos < inject[i].offset + inject[i].size) {
+        memcpy (data, inject[i].data, inject[i].size);
+        data += inject[i].size;
+        pos = inject[i].offset + inject[i].size;
+        /* out position after insert chunk orig */
+        *orig_pos = inject[i].offset_orig + inject[i].size;
+      }
+    }
+  }
+
+  if (ret == FALSE) {
+    /* if it inside a injected is already done */
+    goto done;
+  }
+
+  /* calculate for striped */
+
+  *orig_pos = pos - injected_before;
+  for (i = 0; i < strip_len; ++i) {
+    if (strip[i].offset_orig > pos) {
+      break;
+    }
+    *orig_pos += strip[i].size;
+  }
+
+done:
+
+  if (G_UNLIKELY (*orig_pos >= filter->duration_orig)) {
+    *orig_pos = filter->duration_orig - 1;
+  }
+
+  return ret;
+
+}
+
+static gboolean
+gst_metadata_mux_checkgetrange (GstPad * srcpad)
+{
+  GstMetadataMux *filter = NULL;
+
+  filter = GST_METADATA_MUX (GST_PAD_PARENT (srcpad));
+
+  return gst_pad_check_pull_range (filter->sinkpad);
+}
+
+static GstFlowReturn
+gst_metadata_mux_get_range (GstPad * pad,
+    guint64 offset, guint size, GstBuffer ** buf)
+{
+  GstMetadataMux *filter = NULL;
+  GstFlowReturn ret = GST_FLOW_OK;
+  gint64 offset_orig = 0;
+  guint size_orig;
+  GstBuffer *prepend = NULL;
+  gboolean need_append = FALSE;
+
+  filter = GST_METADATA_MUX (GST_PAD_PARENT (pad));
+
+  if (filter->state != MT_STATE_MUXED) {
+    ret = GST_FLOW_ERROR;
+    goto done;
+  }
+
+  if (offset + size > filter->duration) {
+    size = filter->duration - offset;
+  }
+
+  size_orig = size;
+
+  if (filter->need_send_tag) {
+    gst_metadata_mux_send_tags (filter);
+  }
+
+  gst_metadata_mux_translate_pos_to_orig (filter, offset, &offset_orig,
+      &prepend);
+
+  if (size > 1) {
+    gint64 pos;
+
+    pos = offset + size - 1;
+    gst_metadata_mux_translate_pos_to_orig (filter, pos, &pos, NULL);
+    size_orig = pos + 1 - offset_orig;
+  }
+
+  if (size_orig) {
+
+    ret = gst_pad_pull_range (filter->sinkpad, offset_orig, size_orig, buf);
+
+    if (ret == GST_FLOW_OK && *buf) {
+      gst_metadata_mux_strip_push_buffer (filter, offset_orig, &prepend, buf);
+
+      if (GST_BUFFER_SIZE (*buf) < size) {
+        /* need append */
+        need_append = TRUE;
+      }
+
+    }
+  } else {
+    *buf = prepend;
+  }
+
+done:
+
+  if (need_append) {
+    /* FIXME: together with SEEK and
+     * gst_metadata_parse_translate_pos_to_orig
+     * this way if chunk is added in the end we are in trolble
+     * ...still not implemented 'cause it will not be the
+     * case for the time being
+     */
+  }
+
+  return ret;
+
+}
+
+static gboolean
+gst_metadata_mux_src_activate_pull (GstPad * pad, gboolean active)
+{
+  GstMetadataMux *filter = NULL;
+  gboolean ret;
+
+  filter = GST_METADATA_MUX (gst_pad_get_parent (pad));
+
+  ret = gst_pad_activate_pull (filter->sinkpad, active);
+
+  if (ret && filter->state == MT_STATE_NULL) {
+    ret = gst_metadata_mux_pull_range_mux (filter);
+  }
+
+  gst_object_unref (filter);
+
+  return ret;
+}
+
+
+static GstStateChangeReturn
+gst_metadata_mux_change_state (GstElement * element, GstStateChange transition)
+{
+  GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
+  GstMetadataMux *filter = GST_METADATA_MUX (element);
+
+  switch (transition) {
+    case GST_STATE_CHANGE_NULL_TO_READY:
+      gst_metadata_mux_init_members (filter);
+      filter->adapter_parsing = gst_adapter_new ();
+      filter->taglist = gst_tag_list_new ();
+      metadata_init (&filter->mux_data);
+      break;
+    default:
+      break;
+  }
+
+  ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
+  if (ret == GST_STATE_CHANGE_FAILURE)
+    goto done;
+
+  switch (transition) {
+    case GST_STATE_CHANGE_PAUSED_TO_READY:
+      filter->offset = 0;
+      filter->offset_orig = 0;
+      if (filter->adapter_parsing) {
+        gst_adapter_clear (filter->adapter_parsing);
+      }
+      if (filter->adapter_holding) {
+        gst_adapter_clear (filter->adapter_holding);
+      }
+      if (filter->state != MT_STATE_MUXED) {
+        /* cleanup parser */
+        /* FIXME: could be improved a bit to avoid mem allocation */
+        metadata_dispose (&filter->mux_data);
+        metadata_init (&filter->mux_data);
+      }
+      break;
+    case GST_STATE_CHANGE_READY_TO_NULL:
+      gst_metadata_mux_dispose_members (filter);
+      break;
+    default:
+      break;
+  }
+
+done:
+
+  return ret;
+}
+
+/*
+ * element plugin init function
+ */
+
 gboolean
 gst_metadata_mux_plugin_init (GstPlugin * plugin)
 {
-  /* exchange the strings 'plugin' and 'Template plugin' with your
-   * plugin name and description */
-  GST_DEBUG_CATEGORY_INIT (gst_metadata_mux_debug, "metadatamux",
-      0, "Metadata muxer");
+  GST_DEBUG_CATEGORY_INIT (gst_metadata_mux_debug, "metadatamux", 0,
+      "Metadata demuxer");
 
   return gst_element_register (plugin, "metadatamux",
       GST_RANK_NONE, GST_TYPE_METADATA_MUX);