Added new module for common functions. Using GST_TYPE_FRACTION for Exif (S)Rational types.

Original commit message from CVS:
Added new module for common functions. Using GST_TYPE_FRACTION for Exif (S)Rational types.

1 files changed, 1291 insertions, 0 deletions

diff --git a/ext/metadata/gstmetadatademux.c b/ext/metadata/gstmetadatademux.c
new file mode 100644
index 00000000..9e53be54
--- /dev/null
+++ b/ext/metadata/gstmetadatademux.c
@@ -0,0 +1,1291 @@
+/*
+ * GStreamer
+ * Copyright 2007 Edgard Lima <edgard.lima@indt.org.br>
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Alternatively, the contents of this file may be used under the
+ * GNU Lesser General Public License Version 2.1 (the "LGPL"), in
+ * which case the following provisions apply instead of the ones
+ * mentioned above:
+ *
+ * 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.
+ */
+
+/**
+ * SECTION:metadatademux-metadata
+ *
+ * <refsect2>
+ * <title>Example launch line</title>
+ * <para>
+ * <programlisting>
+ * gst-launch -v -m filesrc location=./test.jpeg ! metadatademux ! fakesink silent=TRUE
+ * </programlisting>
+ * </para>
+ * </refsect2>
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include <gst/gst.h>
+
+#include "gstmetadatademux.h"
+
+#include "metadataexif.h"
+
+#include "metadataiptc.h"
+
+#include "metadataxmp.h"
+
+#include <string.h>
+
+GST_DEBUG_CATEGORY_STATIC (gst_metadata_demux_debug);
+#define GST_CAT_DEFAULT gst_metadata_demux_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
+{
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum
+{
+  ARG_0,
+  ARG_EXIF,
+  ARG_IPTC,
+  ARG_XMP
+};
+
+static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
+    GST_PAD_SINK,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("image/jpeg, "
+        "tags-extracted = (bool) false;"
+        "image/png, " "tags-extracted = (bool) false")
+    );
+
+static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("image/jpeg, "
+        "tags-extracted = (bool) true;"
+        "image/png, " "tags-extracted = (bool) true")
+    );
+
+GST_BOILERPLATE (GstMetadataDemux, gst_metadata_demux, GstElement,
+    GST_TYPE_ELEMENT);
+
+static GstMetadataDemuxClass *metadata_parent_class = NULL;
+
+static void gst_metadata_demux_dispose (GObject * object);
+
+static void gst_metadata_demux_finalize (GObject * object);
+
+static void gst_metadata_demux_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec);
+static void gst_metadata_demux_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec);
+
+static GstStateChangeReturn
+gst_metadata_demux_change_state (GstElement * element,
+    GstStateChange transition);
+
+static GstCaps *gst_metadata_demux_get_caps (GstPad * pad);
+static gboolean gst_metadata_demux_set_caps (GstPad * pad, GstCaps * caps);
+static gboolean gst_metadata_demux_src_event (GstPad * pad, GstEvent * event);
+static gboolean gst_metadata_demux_sink_event (GstPad * pad, GstEvent * event);
+
+static GstFlowReturn gst_metadata_demux_chain (GstPad * pad, GstBuffer * buf);
+
+static gboolean gst_metadata_demux_checkgetrange (GstPad * srcpad);
+
+static GstFlowReturn
+gst_metadata_demux_get_range (GstPad * pad, guint64 offset_orig, guint size,
+    GstBuffer ** buf);
+
+static gboolean gst_metadata_demux_sink_activate (GstPad * pad);
+
+static gboolean
+gst_metadata_demux_src_activate_pull (GstPad * pad, gboolean active);
+
+static gboolean gst_metadata_demux_pull_range_demux (GstMetadataDemux * filter);
+
+static void gst_metadata_demux_init_members (GstMetadataDemux * filter);
+static void gst_metadata_demux_dispose_members (GstMetadataDemux * filter);
+
+static gboolean
+gst_metadata_demux_configure_srccaps (GstMetadataDemux * filter);
+
+static gboolean gst_metadata_demux_configure_caps (GstMetadataDemux * filter);
+
+static int
+gst_metadata_demux_parse (GstMetadataDemux * filter, const guint8 * buf,
+    guint32 size);
+
+static void gst_metadata_demux_send_tags (GstMetadataDemux * filter);
+
+static const GstQueryType *gst_metadata_demux_get_query_types (GstPad * pad);
+
+static gboolean gst_metadata_demux_src_query (GstPad * pad, GstQuery * query);
+
+static void
+gst_metadata_demux_base_init (gpointer gclass)
+{
+  static GstElementDetails element_details = {
+    "Metadata demuxr",
+    "Demuxr/Extracter/Metadata",
+    "Send metadata tags (EXIF, IPTC and XMP) and remove metadata chunks from stream",
+    "Edgard Lima <edgard.lima@indt.org.br>"
+  };
+  GstElementClass *element_class = GST_ELEMENT_CLASS (gclass);
+
+  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, &element_details);
+}
+
+/* initialize the plugin's class */
+static void
+gst_metadata_demux_class_init (GstMetadataDemuxClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  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_demux_dispose);
+  gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_metadata_demux_finalize);
+
+  gobject_class->set_property = gst_metadata_demux_set_property;
+  gobject_class->get_property = gst_metadata_demux_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_demux_change_state;
+
+}
+
+/* initialize the new element
+ * instantiate pads and add them to element
+ * set functions
+ * initialize structure
+ */
+static void
+gst_metadata_demux_init (GstMetadataDemux * filter,
+    GstMetadataDemuxClass * 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_demux_set_caps));
+  gst_pad_set_getcaps_function (filter->sinkpad,
+      GST_DEBUG_FUNCPTR (gst_metadata_demux_get_caps));
+  gst_pad_set_event_function (filter->sinkpad, gst_metadata_demux_sink_event);
+  gst_pad_set_chain_function (filter->sinkpad,
+      GST_DEBUG_FUNCPTR (gst_metadata_demux_chain));
+  gst_pad_set_activate_function (filter->sinkpad,
+      gst_metadata_demux_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_metadata_demux_get_caps));
+  gst_pad_set_event_function (filter->srcpad, gst_metadata_demux_src_event);
+  gst_pad_set_query_function (filter->srcpad,
+      GST_DEBUG_FUNCPTR (gst_metadata_demux_src_query));
+  gst_pad_set_query_type_function (filter->srcpad,
+      GST_DEBUG_FUNCPTR (gst_metadata_demux_get_query_types));
+  gst_pad_use_fixed_caps (filter->srcpad);
+
+  gst_pad_set_checkgetrange_function (filter->srcpad,
+      GST_DEBUG_FUNCPTR (gst_metadata_demux_checkgetrange));
+  gst_pad_set_getrange_function (filter->srcpad, gst_metadata_demux_get_range);
+
+  gst_pad_set_activatepull_function (filter->srcpad,
+      GST_DEBUG_FUNCPTR (gst_metadata_demux_src_activate_pull));
+  /* addind pads */
+
+  gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
+  gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
+
+  metadataparse_xmp_init ();
+  /* init members */
+
+  filter->options = META_OPT_EXIF | META_OPT_IPTC | META_OPT_XMP;
+
+  gst_metadata_demux_init_members (filter);
+
+}
+
+static void
+gst_metadata_demux_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  GstMetadataDemux *filter = GST_METADATA_DEMUX (object);
+
+  switch (prop_id) {
+    case ARG_EXIF:
+      if (g_value_get_boolean (value))
+        filter->options |= META_OPT_EXIF;
+      else
+        filter->options &= ~META_OPT_EXIF;
+      break;
+    case ARG_IPTC:
+      if (g_value_get_boolean (value))
+        filter->options |= META_OPT_IPTC;
+      else
+        filter->options &= ~META_OPT_IPTC;
+      break;
+    case ARG_XMP:
+      if (g_value_get_boolean (value))
+        filter->options |= META_OPT_XMP;
+      else
+        filter->options &= ~META_OPT_XMP;
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+gst_metadata_demux_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec)
+{
+  GstMetadataDemux *filter = GST_METADATA_DEMUX (object);
+
+  switch (prop_id) {
+    case ARG_EXIF:
+      g_value_set_boolean (value, filter->options & META_OPT_EXIF);
+      break;
+    case ARG_IPTC:
+      g_value_set_boolean (value, filter->options & META_OPT_IPTC);
+      break;
+    case ARG_XMP:
+      g_value_set_boolean (value, filter->options & META_OPT_XMP);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+/* GstElement vmethod implementations */
+
+static GstCaps *
+gst_metadata_demux_get_caps (GstPad * pad)
+{
+  GstMetadataDemux *filter = NULL;
+  GstPad *otherpad;
+  GstCaps *caps_new = NULL;
+  GstCaps *caps_otherpad_peer = NULL;
+
+  filter = GST_METADATA_DEMUX (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_demux_src_event (GstPad * pad, GstEvent * event)
+{
+  GstMetadataDemux *filter = NULL;
+  gboolean ret = FALSE;
+
+  filter = GST_METADATA_DEMUX (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 demux */
+      if (filter->common.state != MT_STATE_PARSED)
+        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->common.duration < 0)
+            goto done;
+          start = start * filter->common.duration / 100;
+          stop = stop * filter->common.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->common.duration < 0)
+          goto done;
+        start = filter->common.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_common_translate_pos_to_orig (&filter->common, 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->common.duration < 0)
+          goto done;
+        stop = filter->common.duration + stop;
+      }
+      stop_type == GST_SEEK_TYPE_SET;
+
+      gst_metadata_common_translate_pos_to_orig (&filter->common, 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_demux_sink_event (GstPad * pad, GstEvent * event)
+{
+  GstMetadataDemux *filter = NULL;
+  gboolean ret = FALSE;
+
+  filter = GST_METADATA_DEMUX (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_demux_dispose (GObject * object)
+{
+  GstMetadataDemux *filter = NULL;
+
+  filter = GST_METADATA_DEMUX (object);
+
+  gst_metadata_demux_dispose_members (filter);
+
+  metadataparse_xmp_dispose ();
+
+  G_OBJECT_CLASS (metadata_parent_class)->dispose (object);
+}
+
+static void
+gst_metadata_demux_finalize (GObject * object)
+{
+  G_OBJECT_CLASS (metadata_parent_class)->finalize (object);
+}
+
+static void
+gst_metadata_demux_dispose_members (GstMetadataDemux * filter)
+{
+  gst_metadata_common_dispose (&filter->common);
+
+  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->prepend_buffer) {
+    gst_buffer_unref (filter->prepend_buffer);
+    filter->prepend_buffer = NULL;
+  }
+}
+
+static void
+gst_metadata_demux_init_members (GstMetadataDemux * filter)
+{
+  filter->need_send_tag = FALSE;
+
+  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->offset = 0;
+  filter->need_more_data = FALSE;
+
+  filter->prepend_buffer = NULL;
+
+  memset (&filter->common, 0x00, sizeof (filter->common));
+
+}
+
+static gboolean
+gst_metadata_demux_configure_srccaps (GstMetadataDemux * 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_demux_configure_caps (GstMetadataDemux * 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_demux_set_caps (GstPad * pad, GstCaps * caps)
+{
+  GstMetadataDemux *filter = NULL;
+  GstStructure *structure = NULL;
+  const gchar *mime = NULL;
+  gboolean ret = FALSE;
+  gboolean demuxd = TRUE;
+
+  filter = GST_METADATA_DEMUX (gst_pad_get_parent (pad));
+
+  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", &demuxd)) {
+    if (demuxd == TRUE) {
+      ret = FALSE;
+      goto done;
+    }
+  }
+
+  ret = gst_metadata_demux_configure_srccaps (filter);
+
+done:
+
+  gst_object_unref (filter);
+
+  return ret;
+}
+
+static void
+gst_metadata_demux_send_tags (GstMetadataDemux * filter)
+{
+
+  GstMessage *msg;
+  GstTagList *taglist = gst_tag_list_new ();
+  GstEvent *event;
+
+  if (filter->options & META_OPT_EXIF)
+    metadataparse_exif_tag_list_add (taglist, GST_TAG_MERGE_KEEP,
+        filter->common.metadata.exif_adapter, METADATA_TAG_MAP_WHOLECHUNK);
+  if (filter->options & META_OPT_IPTC)
+    metadataparse_iptc_tag_list_add (taglist, GST_TAG_MERGE_KEEP,
+        filter->common.metadata.iptc_adapter, METADATA_TAG_MAP_WHOLECHUNK);
+  if (filter->options & META_OPT_XMP)
+    metadataparse_xmp_tag_list_add (taglist, GST_TAG_MERGE_KEEP,
+        filter->common.metadata.xmp_adapter, METADATA_TAG_MAP_WHOLECHUNK);
+
+  if (taglist && !gst_tag_list_is_empty (taglist)) {
+
+    msg =
+        gst_message_new_tag (GST_OBJECT (filter), gst_tag_list_copy (taglist));
+    gst_element_post_message (GST_ELEMENT (filter), msg);
+
+    event = gst_event_new_tag (taglist);
+    gst_pad_push_event (filter->srcpad, event);
+    taglist = NULL;
+  }
+
+  if (!taglist)
+    taglist = gst_tag_list_new ();
+
+  if (filter->options & META_OPT_EXIF)
+    metadataparse_exif_tag_list_add (taglist, GST_TAG_MERGE_KEEP,
+        filter->common.metadata.exif_adapter, METADATA_TAG_MAP_INDIVIDUALS);
+  if (filter->options & META_OPT_IPTC)
+    metadataparse_iptc_tag_list_add (taglist, GST_TAG_MERGE_KEEP,
+        filter->common.metadata.iptc_adapter, METADATA_TAG_MAP_INDIVIDUALS);
+  if (filter->options & META_OPT_XMP)
+    metadataparse_xmp_tag_list_add (taglist, GST_TAG_MERGE_KEEP,
+        filter->common.metadata.xmp_adapter, METADATA_TAG_MAP_INDIVIDUALS);
+
+  if (taglist && !gst_tag_list_is_empty (taglist)) {
+
+    msg = gst_message_new_tag (GST_OBJECT (filter), taglist);
+    gst_element_post_message (GST_ELEMENT (filter), msg);
+    taglist = NULL;
+  }
+
+  if (taglist)
+    gst_tag_list_free (taglist);
+
+  filter->need_send_tag = FALSE;
+}
+
+static const GstQueryType *
+gst_metadata_demux_get_query_types (GstPad * pad)
+{
+  static const GstQueryType gst_metadata_demux_src_query_types[] = {
+    GST_QUERY_POSITION,
+    GST_QUERY_DURATION,
+    GST_QUERY_FORMATS,
+    0
+  };
+
+  return gst_metadata_demux_src_query_types;
+}
+
+static gboolean
+gst_metadata_demux_src_query (GstPad * pad, GstQuery * query)
+{
+  gboolean ret = FALSE;
+  GstFormat format;
+  GstMetadataDemux *filter = GST_METADATA_DEMUX (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->common.state != MT_STATE_PARSED)
+        goto done;
+
+      gst_query_parse_duration (query, &format, NULL);
+
+      if (format == GST_FORMAT_BYTES) {
+        if (filter->common.duration >= 0) {
+          gst_query_set_duration (query, GST_FORMAT_BYTES,
+              filter->common.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;
+
+}
+
+/*
+ * Do parsing step-by-step and reconfigure caps if need
+ * return:
+ *   META_PARSING_ERROR
+ *   META_PARSING_DONE
+ *   META_PARSING_NEED_MORE_DATA
+ */
+
+static int
+gst_metadata_demux_parse (GstMetadataDemux * filter, const guint8 * buf,
+    guint32 size)
+{
+
+  int ret = META_PARSING_ERROR;
+
+  filter->next_offset = 0;
+  filter->next_size = 0;
+
+  ret = metadata_parse (&filter->common.metadata, buf, size,
+      &filter->next_offset, &filter->next_size);
+
+  if (ret == META_PARSING_ERROR) {
+    if (META_DATA_IMG_TYPE (filter->common.metadata) == 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 == META_PARSING_NEED_MORE_DATA) {
+    filter->need_more_data = TRUE;
+  } else {
+    filter->common.state = MT_STATE_PARSED;
+    gst_metadata_common_calculate_offsets (&filter->common);
+    filter->need_more_data = FALSE;
+    filter->need_send_tag = TRUE;
+  }
+
+  /* reconfigure caps if it is different from type detected by 'metadata_demux' function */
+  if (filter->img_type != META_DATA_IMG_TYPE (filter->common.metadata)) {
+    filter->img_type = META_DATA_IMG_TYPE (filter->common.metadata);
+    if (!gst_metadata_demux_configure_caps (filter)) {
+      GST_ELEMENT_ERROR (filter, STREAM, FORMAT, (NULL),
+          ("Couldn't reconfigure caps for %s",
+              gst_metadata_common_get_type_name (filter->img_type)));
+      ret = META_PARSING_ERROR;
+      goto done;
+    }
+  }
+
+done:
+
+  return ret;
+
+}
+
+/* chain function
+ * this function does the actual processing
+ */
+
+/* FIXME */
+/* Current demux is just done before is pull mode could be activated */
+/* may be it is possible to demux 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 !  metadatademux ! filesink location=gen3.jpg */
+
+static GstFlowReturn
+gst_metadata_demux_chain (GstPad * pad, GstBuffer * buf)
+{
+  GstMetadataDemux *filter = NULL;
+  GstFlowReturn ret = GST_FLOW_ERROR;
+  guint32 buf_size = 0;
+  guint32 new_buf_size = 0;
+  gboolean append = FALSE;
+
+  filter = GST_METADATA_DEMUX (gst_pad_get_parent (pad));
+
+  if (filter->common.state != MT_STATE_PARSED) {
+    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_demux_parse (filter, new_buf,
+              adpt_size) == META_PARSING_ERROR) {
+        ret = GST_FLOW_ERROR;
+        goto done;
+      }
+    }
+  }
+
+  if (filter->common.state == MT_STATE_PARSED) {
+
+    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_demux_send_tags (filter);
+    }
+
+    if (filter->offset_orig + GST_BUFFER_SIZE (buf) ==
+        filter->common.duration_orig)
+      append = TRUE;
+
+    buf_size = GST_BUFFER_SIZE (buf);
+
+    gst_metadata_common_strip_push_buffer (&filter->common, 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;
+    }
+
+    if (append && filter->common.append_buffer) {
+      gst_buffer_set_caps (filter->common.append_buffer,
+          GST_PAD_CAPS (filter->srcpad));
+      gst_buffer_ref (filter->common.append_buffer);
+      ret = gst_pad_push (filter->srcpad, filter->common.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 demuxd */
+    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;
+
+}
+
+static gboolean
+gst_metadata_demux_pull_range_demux (GstMetadataDemux * 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;
+  }
+  filter->common.duration_orig = duration;
+
+  if (format != GST_FORMAT_BYTES) {
+    /* this should never happen, but try chain anyway */
+    ret = TRUE;
+    goto done;
+  }
+
+  do {
+    GstFlowReturn flow;
+    GstBuffer *buf = NULL;
+
+    offset += filter->next_offset;
+
+    /* 'filter->next_size' only says the minimum required number of bytes.
+       We try provided more bytes (4096) just to avoid a lot of calls to 'metadata_demux'
+       returning META_PARSING_NEED_MORE_DATA */
+    if (filter->next_size < 4096) {
+      if (duration - offset < 4096) {
+        /* In case there is no 4096 bytes available upstream.
+           It should be done upstream but we do here for safety */
+        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_demux_parse (filter, GST_BUFFER_DATA (buf),
+        GST_BUFFER_SIZE (buf));
+    if (res == META_PARSING_ERROR) {
+      ret = FALSE;
+      goto done;
+    }
+
+    gst_buffer_unref (buf);
+
+  } while (res == META_PARSING_NEED_MORE_DATA);
+
+done:
+
+  return ret;
+
+}
+
+static gboolean
+gst_metadata_demux_sink_activate (GstPad * pad)
+{
+  GstMetadataDemux *filter = NULL;
+  gboolean ret = TRUE;
+
+
+  filter = GST_METADATA_DEMUX (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 demux in chain. Fail here ? */
+    /* nothing to be done by now, activate push mode */
+    return gst_pad_activate_push (pad, TRUE);
+  }
+
+  /* try to demux */
+  if (filter->common.state == MT_STATE_NULL) {
+    ret = gst_metadata_demux_pull_range_demux (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;
+
+}
+
+static gboolean
+gst_metadata_demux_checkgetrange (GstPad * srcpad)
+{
+  GstMetadataDemux *filter = NULL;
+
+  filter = GST_METADATA_DEMUX (GST_PAD_PARENT (srcpad));
+
+  return gst_pad_check_pull_range (filter->sinkpad);
+}
+
+static GstFlowReturn
+gst_metadata_demux_get_range (GstPad * pad,
+    guint64 offset, guint size, GstBuffer ** buf)
+{
+  GstMetadataDemux *filter = NULL;
+  GstFlowReturn ret = GST_FLOW_OK;
+  gint64 offset_orig = 0;
+  guint size_orig;
+  GstBuffer *prepend = NULL;
+  gboolean need_append = FALSE;
+
+  filter = GST_METADATA_DEMUX (GST_PAD_PARENT (pad));
+
+  if (filter->common.state != MT_STATE_PARSED) {
+    ret = GST_FLOW_ERROR;
+    goto done;
+  }
+
+  if (offset + size > filter->common.duration) {
+    size = filter->common.duration - offset;
+  }
+
+  size_orig = size;
+
+  if (filter->need_send_tag) {
+    gst_metadata_demux_send_tags (filter);
+  }
+
+  gst_metadata_common_translate_pos_to_orig (&filter->common, offset,
+      &offset_orig, &prepend);
+
+  if (size > 1) {
+    gint64 pos;
+
+    pos = offset + size - 1;
+    gst_metadata_common_translate_pos_to_orig (&filter->common, 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_common_strip_push_buffer (&filter->common, 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_common_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_demux_src_activate_pull (GstPad * pad, gboolean active)
+{
+  GstMetadataDemux *filter = NULL;
+  gboolean ret;
+
+  filter = GST_METADATA_DEMUX (gst_pad_get_parent (pad));
+
+  ret = gst_pad_activate_pull (filter->sinkpad, active);
+
+  if (ret && filter->common.state == MT_STATE_NULL) {
+    ret = gst_metadata_demux_pull_range_demux (filter);
+  }
+
+  gst_object_unref (filter);
+
+  return ret;
+}
+
+
+static GstStateChangeReturn
+gst_metadata_demux_change_state (GstElement * element,
+    GstStateChange transition)
+{
+  GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
+  GstMetadataDemux *filter = GST_METADATA_DEMUX (element);
+
+  switch (transition) {
+    case GST_STATE_CHANGE_NULL_TO_READY:
+      gst_metadata_demux_init_members (filter);
+      filter->adapter_parsing = gst_adapter_new ();
+      gst_metadata_common_init (&filter->common, TRUE, filter->options);
+      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->common.state != MT_STATE_PARSED) {
+        /* cleanup demuxr */
+        gst_metadata_common_dispose (&filter->common);
+        gst_metadata_common_init (&filter->common, TRUE, filter->options);
+      }
+      break;
+    case GST_STATE_CHANGE_READY_TO_NULL:
+      gst_metadata_demux_dispose_members (filter);
+      break;
+    default:
+      break;
+  }
+
+done:
+
+  return ret;
+}
+
+/*
+ * element plugin init function
+ */
+
+gboolean
+gst_metadata_demux_plugin_init (GstPlugin * plugin)
+{
+  GST_DEBUG_CATEGORY_INIT (gst_metadata_demux_debug, "metadatademux", 0,
+      "Metadata demuxer");
+
+  return gst_element_register (plugin, "metadatademux",
+      GST_RANK_PRIMARY + 1, GST_TYPE_METADATA_DEMUX);
+}