Strip out metadata chunks.

Original commit message from CVS:
Strip out metadata chunks.

10 files changed, 540 insertions, 86 deletions

diff --git a/ChangeLog b/ChangeLog
index d18d4a08..397681fd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,16 @@
+2007-11-18  Edgard Lima  <edgard.lima@indt.org.br>
+
+	* ext/metadata/gstmetadataparse.c:
+	* ext/metadata/gstmetadataparse.h:
+	* ext/metadata/metadataparse.c:
+	* ext/metadata/metadataparse.h:
+	* ext/metadata/metadataparsejpeg.c:
+	* ext/metadata/metadataparsejpeg.h:
+	* ext/metadata/metadataparsepng.c:
+	* ext/metadata/metadataparsepng.h:
+	* ext/metadata/metadataparsetypes.h:
+	  Strip out metadata chunks.
+
 2007-11-16  Stefan Kost  <ensonic@users.sf.net>
 
 	* configure.ac:
diff --git a/ext/metadata/gstmetadataparse.c b/ext/metadata/gstmetadataparse.c
index be1e0d43..43dbe6ad 100644
--- a/ext/metadata/gstmetadataparse.c
+++ b/ext/metadata/gstmetadataparse.c
@@ -161,6 +161,13 @@ gst_metadata_parse_parse (GstMetadataParse * filter, const guint8 * buf,
 
 static void gst_metadata_parse_send_tags (GstMetadataParse * filter);
 
+static gboolean gst_metadata_parse_activate (GstPad * pad);
+
+static gboolean
+gst_metadata_parse_get_strip_range (gint64 * boffset, guint32 * bsize,
+    const gint64 seg_offset, const guint32 seg_size,
+    gint64 * toffset, guint32 * tsize, gint64 * ioffset);
+
 static void
 gst_metadata_parse_base_init (gpointer gclass)
 {
@@ -492,11 +499,24 @@ gst_metadata_parse_init_members (GstMetadataParse * filter)
   filter->exif = TRUE;
   filter->iptc = TRUE;
   filter->xmp = TRUE;
+
+  memset (filter->seg_offset, 0x00, sizeof (filter->seg_offset[0]) * 3);
+  memset (filter->seg_size, 0x00, sizeof (filter->seg_size[0]) * 3);
+
+  memset (filter->seg_inject_data, 0x00,
+      sizeof (filter->seg_inject_data[0]) * 3);
+  memset (filter->seg_inject_size, 0x00,
+      sizeof (filter->seg_inject_size[0]) * 3);
+
+  filter->num_segs = 0;
+
   filter->taglist = NULL;
   filter->adapter = NULL;
   filter->next_offset = 0;
   filter->next_size = 0;
   filter->img_type = IMG_NONE;
+  filter->duration = -1;
+  filter->offset = 0;
   filter->state = MT_STATE_NULL;
   filter->need_more_data = FALSE;
   metadataparse_init (&filter->parse_data);
@@ -654,13 +674,13 @@ gst_metadata_parse_send_tags (GstMetadataParse * filter)
 
   if (PARSE_DATA_OPTION (filter->parse_data) & PARSE_OPT_EXIF)
     metadataparse_exif_tag_list_add (filter->taglist, GST_TAG_MERGE_KEEP,
-        filter->parse_data.adpt_exif);
+        filter->parse_data.exif.adapter);
   if (PARSE_DATA_OPTION (filter->parse_data) & PARSE_OPT_IPTC)
     metadataparse_iptc_tag_list_add (filter->taglist, GST_TAG_MERGE_KEEP,
-        filter->parse_data.adpt_iptc);
+        filter->parse_data.iptc.adapter);
   if (PARSE_DATA_OPTION (filter->parse_data) & PARSE_OPT_XMP)
     metadataparse_xmp_tag_list_add (filter->taglist, GST_TAG_MERGE_KEEP,
-        filter->parse_data.adpt_xmp);
+        filter->parse_data.xmp.adapter);
 
   if (!gst_tag_list_is_empty (filter->taglist)) {
 
@@ -708,6 +728,70 @@ gst_metadata_parse_parse (GstMetadataParse * filter, const guint8 * buf,
   } else if (ret > 0) {
     filter->need_more_data = TRUE;
   } else {
+    int i, j;
+
+    filter->num_segs = 0;
+
+    /* FIXME: better design for segments */
+
+    filter->seg_size[0] = filter->parse_data.exif.size;
+    filter->seg_offset[0] = filter->parse_data.exif.offset;
+    filter->seg_inject_size[0] = filter->parse_data.exif.size_inject;
+    filter->seg_inject_data[0] = filter->parse_data.exif.buffer;
+
+    filter->seg_size[1] = filter->parse_data.iptc.size;
+    filter->seg_offset[1] = filter->parse_data.iptc.offset;
+    filter->seg_inject_size[1] = filter->parse_data.iptc.size_inject;
+    filter->seg_inject_data[1] = filter->parse_data.iptc.buffer;
+
+    filter->seg_size[2] = filter->parse_data.xmp.size;
+    filter->seg_offset[2] = filter->parse_data.xmp.offset;
+    filter->seg_inject_size[2] = filter->parse_data.xmp.size_inject;
+    filter->seg_inject_data[2] = filter->parse_data.xmp.buffer;
+
+    for (i = 0; i < 3; ++i) {
+      if (filter->seg_size[i]) {
+        filter->num_segs++;
+      }
+    }
+
+    if (filter->num_segs) {
+
+      for (i = 0; i < 3; ++i) {
+        int j, min = i;
+
+        for (j = i + 1; j < 3; ++j) {
+          if (filter->seg_size[j])
+            if (filter->seg_size[min] == 0
+                || filter->seg_offset[j] < filter->seg_offset[min])
+              min = j;
+        }
+        if (min != i) {
+          gint64 aux_offset;
+          guint32 aux_size;
+          guint8 *aux_data;
+
+          aux_offset = filter->seg_offset[i];
+          aux_size = filter->seg_size[i];
+
+          filter->seg_offset[i] = filter->seg_offset[min];
+          filter->seg_size[i] = filter->seg_size[min];
+
+          filter->seg_offset[min] = aux_offset;
+          filter->seg_size[min] = aux_size;
+
+          aux_size = filter->seg_inject_size[i];
+          filter->seg_inject_size[i] = filter->seg_inject_size[min];
+          filter->seg_inject_size[min] = aux_size;
+
+          aux_data = filter->seg_inject_data[i];
+          filter->seg_inject_data[i] = filter->seg_inject_data[min];
+          filter->seg_inject_data[min] = aux_data;
+        }
+      }
+
+    }
+
     filter->state = MT_STATE_PARSED;
     filter->need_more_data = FALSE;
     filter->need_send_tag = TRUE;
@@ -739,9 +823,12 @@ gst_metadata_parse_chain (GstPad * pad, GstBuffer * buf)
 {
   GstMetadataParse *filter = NULL;
   GstFlowReturn ret = GST_FLOW_ERROR;
+  guint32 buf_size;
 
   filter = GST_METADATA_PARSE (gst_pad_get_parent (pad));
 
+  /* commented until I figure out how to strip if it wasn't parsed yet */
+#if 0
   if (filter->state != MT_STATE_PARSED) {
     guint32 adpt_size = gst_adapter_available (filter->adapter);
 
@@ -785,15 +872,24 @@ gst_metadata_parse_chain (GstPad * pad, GstBuffer * buf)
         goto done;
     }
   }
+#endif
 
   if (filter->need_send_tag) {
     gst_metadata_parse_send_tags (filter);
   }
 
-  gst_buffer_set_caps (buf, GST_PAD_CAPS (filter->srcpad));
+  buf_size = GST_BUFFER_SIZE (buf);
+  gst_metadata_parse_strip_buffer (filter, &buf);
+  filter->offset += buf_size;
+
+  if (buf) {                    /* may be all buffer has been striped */
+    gst_buffer_set_caps (buf, GST_PAD_CAPS (filter->srcpad));
 
-  ret = gst_pad_push (filter->srcpad, buf);
-  buf = NULL;                   /* this function don't owner it anymore */
+    ret = gst_pad_push (filter->srcpad, buf);
+    buf = NULL;                 /* this function don't owner it anymore */
+  } else {
+    ret = GST_FLOW_OK;
+  }
 
 done:
 
@@ -905,6 +1001,197 @@ done:
 
 }
 
+/*
+ * Returns FALSE if nothing has stripped, TRUE if otherwise
+ */
+
+gboolean
+gst_metadata_parse_get_strip_range (gint64 * boffset, guint32 * bsize,
+    const gint64 seg_offset, const guint32 seg_size,
+    gint64 * toffset, guint32 * tsize, gint64 * ioffset)
+{
+
+  gboolean ret = FALSE;
+
+  if (seg_size == 0 || *bsize == 0)
+    goto done;
+
+  /* segment after buffer */
+  if (seg_offset > *boffset + *bsize) {
+    *bsize = 0;
+    goto done;
+  }
+
+  if (seg_offset < *boffset) {
+    /* segment start somewhere before buffer */
+    guint32 cut_size;
+
+    /* all segment before buffer */
+    if (seg_offset + seg_size <= *boffset) {
+      *tsize = *bsize;
+      *bsize = 0;
+      *toffset = *boffset;
+      goto done;
+    }
+
+    cut_size = seg_size - (*boffset - seg_offset);
+
+    if (cut_size >= *bsize) {
+      /* all buffer striped out */
+      *bsize = 0;
+      *tsize = 0;
+    } else {
+      /* just beginning buffers striped */
+      *toffset = *boffset + cut_size;
+      *tsize = *bsize - cut_size;
+      *bsize = 0;
+    }
+
+  } else {
+    /* segment start somewhere into buffer */
+    *ioffset = seg_offset;
+
+    if (seg_offset + seg_size >= *boffset + *bsize) {
+      /* strip just tail */
+      *bsize = seg_offset - *boffset;
+    } else {
+      /* strip the middle */
+      *toffset = seg_offset + seg_size;
+      *tsize = *boffset + *bsize - seg_offset - seg_size;
+      *bsize = seg_offset - *boffset;
+    }
+
+  }
+
+  ret = TRUE;
+
+done:
+
+  return ret;
+
+}
+
+/*
+ *  TRUE -> buffer striped (or injeted)
+ *  FALSE -> buffer unmodified
+ */
+
+gboolean
+gst_metadata_parse_strip_buffer (GstMetadataParse * filter, GstBuffer ** buf)
+{
+
+  gint64 boffset[3];
+  guint32 bsize[3];
+
+  gint64 toffset[3];
+  guint32 tsize[3];
+
+  gint64 ioffset[3];
+
+  const gint64 *seg_offset = filter->seg_offset;
+
+  const guint32 *seg_size = filter->seg_size;
+
+  int i;
+  gboolean ret = FALSE;
+  guint32 new_size = 0;
+  const gint64 offset = filter->offset;
+
+  if (filter->num_segs == 0)
+    goto done;
+
+  memset (bsize, 0x00, sizeof (bsize));
+  memset (tsize, 0x00, sizeof (tsize));
+
+  for (i = 0; i < filter->num_segs; ++i) {
+    ioffset[i] = -1;
+  }
+
+  boffset[0] = offset;
+  new_size = bsize[0] = GST_BUFFER_SIZE (*buf);
+  i = 0;
+
+  for (i = 0; i < filter->num_segs; ++i) {
+    guint32 striped_size;
+
+    striped_size = bsize[i];
+    if (gst_metadata_parse_get_strip_range (&boffset[i], &bsize[i],
+            seg_offset[i], seg_size[i], &toffset[i], &tsize[i], &ioffset[i])) {
+      ret = TRUE;
+      new_size -= (striped_size - (bsize[i] + tsize[i]));
+    }
+    if (i + 1 < filter->num_segs) {
+      if (tsize[i]) {
+        boffset[i + 1] = toffset[i];
+        bsize[i + 1] = GST_BUFFER_SIZE (*buf) - (toffset[i] - offset);
+        tsize[i] = 0;
+      } else {
+        /* buffer already consumed */
+        break;
+      }
+    }
+    if (new_size == 0) {
+      /* all buffer striped already */
+      break;
+    }
+
+  }
+
+  /* segments must be sorted by offset to make this copy */
+  if (ret) {
+    if (new_size == 0) {
+      gst_buffer_unref (*buf);
+      *buf = NULL;
+    } else {
+      GstBuffer *new_buf;
+      guint8 *data;
+
+      for (i = 0; i < filter->num_segs; ++i) {
+        if (filter->seg_inject_size[i] == 0)
+          ioffset[i] = -1;
+        else
+          new_size += filter->seg_inject_size[i];
+      }
+
+      if (GST_BUFFER_SIZE (new_buf) < new_size) {
+        /* FIXME: alloc more memory here */
+      }
+
+      /* FIXME: try to use buffer data in place */
+      new_buf = gst_buffer_copy (*buf);
+      data = GST_BUFFER_DATA (new_buf);
+
+      GST_BUFFER_SIZE (new_buf) = new_size;
+
+      for (i = 0; i < filter->num_segs; ++i) {
+        if (bsize[i]) {
+          memcpy (data,
+              GST_BUFFER_DATA (*buf) + (boffset[i] - offset), bsize[i]);
+          data += bsize[i];
+        }
+        if (ioffset[i] >= 0) {
+          memcpy (data, filter->seg_inject_data[i], filter->seg_inject_size[i]);
+          data += filter->seg_inject_size[i];
+        }
+        if (tsize[i]) {
+          memcpy (data,
+              GST_BUFFER_DATA (*buf) + (toffset[i] - offset), tsize[i]);
+          data += tsize[i];
+        }
+      }
+      gst_buffer_unref (*buf);
+      *buf = new_buf;
+      GST_BUFFER_FLAG_UNSET (*buf, GST_BUFFER_FLAG_READONLY);
+    }
+  }
+
+
+done:
+
+  return ret;
+
+}
+
 static gboolean
 gst_metadata_parse_get_range (GstPad * pad,
     guint64 offset, guint size, GstBuffer ** buf)
diff --git a/ext/metadata/gstmetadataparse.h b/ext/metadata/gstmetadataparse.h
index eb1f802d..dd5a031c 100644
--- a/ext/metadata/gstmetadataparse.h
+++ b/ext/metadata/gstmetadataparse.h
@@ -79,6 +79,14 @@ struct _GstMetadataParse
   gboolean iptc;
   gboolean xmp;
 
+  gint64 seg_offset[3];
+  guint32 seg_size[3];
+
+  guint32 seg_inject_size[3];
+  guint8 * seg_inject_data[3];
+
+  gint8 num_segs;
+
   gboolean need_send_tag;
 
   GstTagList *taglist;
@@ -88,6 +96,9 @@ struct _GstMetadataParse
   guint32 next_size;
   ImageType img_type;
 
+  gint64 duration;
+  gint64 offset;
+
   MetadataState state;
 
   gboolean need_more_data;
diff --git a/ext/metadata/metadataparse.c b/ext/metadata/metadataparse.c
index 8a16bcf3..410ae847 100644
--- a/ext/metadata/metadataparse.c
+++ b/ext/metadata/metadataparse.c
@@ -41,6 +41,8 @@
  * Boston, MA 02111-1307, USA.
  */
 
+#include <string.h>
+
 #include "metadataparse.h"
 
 /*
@@ -61,9 +63,10 @@ metadataparse_init (ParseData * parse_data)
   parse_data->state = STATE_NULL;
   parse_data->img_type = IMG_NONE;
   parse_data->option = PARSE_OPT_ALL;
-  parse_data->adpt_exif = NULL;
-  parse_data->adpt_iptc = NULL;
-  parse_data->adpt_xmp = NULL;
+  parse_data->offset = 0;
+  memset (&parse_data->exif, 0x00, sizeof (MetadataChunk));
+  memset (&parse_data->iptc, 0x00, sizeof (MetadataChunk));
+  memset (&parse_data->xmp, 0x00, sizeof (MetadataChunk));
 }
 
 /*
@@ -97,12 +100,12 @@ metadataparse_parse (ParseData * parse_data, const guint8 * buf,
     case IMG_JPEG:
       ret =
           metadataparse_jpeg_parse (&parse_data->format_data.jpeg,
-          (guint8 *) buf, &bufsize, &next_start, next_size);
+          (guint8 *) buf, &bufsize, parse_data->offset, &next_start, next_size);
       break;
     case IMG_PNG:
       ret =
           metadataparse_png_parse (&parse_data->format_data.png,
-          (guint8 *) buf, &bufsize, &next_start, next_size);
+          (guint8 *) buf, &bufsize, parse_data->offset, &next_start, next_size);
       break;
     default:
       /* unexpected */
@@ -112,6 +115,7 @@ metadataparse_parse (ParseData * parse_data, const guint8 * buf,
   }
 
   *next_offset = next_start - buf;
+  parse_data->offset += *next_offset;
 
 done:
 
@@ -135,21 +139,34 @@ metadataparse_dispose (ParseData * parse_data)
       break;
   }
 
-  if (parse_data->adpt_xmp) {
-    gst_object_unref (parse_data->adpt_xmp);
-    parse_data->adpt_xmp = NULL;
+  if (parse_data->xmp.adapter) {
+    gst_object_unref (parse_data->xmp.adapter);
+  }
+
+  if (parse_data->iptc.adapter) {
+    gst_object_unref (parse_data->iptc.adapter);
+  }
+
+  if (parse_data->exif.adapter) {
+    gst_object_unref (parse_data->exif.adapter);
+  }
+
+  if (parse_data->xmp.buffer) {
+    free (parse_data->xmp.buffer);
   }
 
-  if (parse_data->adpt_iptc) {
-    gst_object_unref (parse_data->adpt_iptc);
-    parse_data->adpt_iptc = NULL;
+  if (parse_data->iptc.buffer) {
+    free (parse_data->iptc.buffer);
   }
 
-  if (parse_data->adpt_exif) {
-    gst_object_unref (parse_data->adpt_exif);
-    parse_data->adpt_exif = NULL;
+  if (parse_data->exif.buffer) {
+    free (parse_data->exif.buffer);
   }
 
+  memset (&parse_data->xmp, 0x00, sizeof (MetadataChunk));
+  memset (&parse_data->iptc, 0x00, sizeof (MetadataChunk));
+  memset (&parse_data->exif, 0x00, sizeof (MetadataChunk));
+
 }
 
 /*
@@ -163,11 +180,11 @@ metadataparse_parse_none (ParseData * parse_data, const guint8 * buf,
 {
 
   int ret = -1;
-  GstAdapter **adpt_exif = NULL;
-  GstAdapter **adpt_iptc = NULL;
-  GstAdapter **adpt_xmp = NULL;
+  MetadataChunk *exif = NULL;
+  MetadataChunk *iptc = NULL;
+  MetadataChunk *xmp = NULL;
 
-  *next_start = buf;
+  *next_start = (guint8 *) buf;
 
   parse_data->img_type = IMG_NONE;
 
@@ -178,15 +195,14 @@ metadataparse_parse_none (ParseData * parse_data, const guint8 * buf,
   }
 
   if (parse_data->option & PARSE_OPT_EXIF)
-    adpt_exif = &parse_data->adpt_exif;
+    exif = &parse_data->exif;
   if (parse_data->option & PARSE_OPT_IPTC)
-    adpt_iptc = &parse_data->adpt_iptc;
+    iptc = &parse_data->iptc;
   if (parse_data->option & PARSE_OPT_XMP)
-    adpt_xmp = &parse_data->adpt_xmp;
+    xmp = &parse_data->xmp;
 
   if (buf[0] == 0xFF && buf[1] == 0xD8 && buf[2] == 0xFF) {
-    metadataparse_jpeg_init (&parse_data->format_data.jpeg, adpt_exif,
-        adpt_iptc, adpt_xmp);
+    metadataparse_jpeg_init (&parse_data->format_data.jpeg, exif, iptc, xmp);
     ret = 0;
     parse_data->img_type = IMG_JPEG;
     goto done;
@@ -200,8 +216,7 @@ metadataparse_parse_none (ParseData * parse_data, const guint8 * buf,
 
   if (buf[0] == 0x89 && buf[1] == 0x50 && buf[2] == 0x4E && buf[3] == 0x47 &&
       buf[4] == 0x0D && buf[5] == 0x0A && buf[6] == 0x1A && buf[7] == 0x0A) {
-    metadataparse_png_init (&parse_data->format_data.png, adpt_exif,
-        adpt_iptc, adpt_xmp);
+    metadataparse_png_init (&parse_data->format_data.png, exif, iptc, xmp);
     ret = 0;
     parse_data->img_type = IMG_PNG;
     goto done;
diff --git a/ext/metadata/metadataparse.h b/ext/metadata/metadataparse.h
index 4534f12a..98c1714d 100644
--- a/ext/metadata/metadataparse.h
+++ b/ext/metadata/metadataparse.h
@@ -45,6 +45,7 @@
 #define __METADATAPARSE_H__
 
 #include <gst/base/gstadapter.h>
+#include "metadataparsetypes.h"
 
 #include "metadataparsejpeg.h"
 #include "metadataparsepng.h"
@@ -78,14 +79,15 @@ typedef struct _tag_ParseData
   ParseState state;
   ImageType img_type;
   ParseOption option;
+  guint32 offset; /* offset since begining of stream */
   union
   {
     JpegData jpeg;
     PngData png;
   } format_data;
-  GstAdapter *adpt_exif;
-  GstAdapter *adpt_iptc;
-  GstAdapter *adpt_xmp;
+  MetadataChunk exif;
+  MetadataChunk iptc;
+  MetadataChunk xmp;
 } ParseData;
 
 #define PARSE_DATA_IMG_TYPE(p) (p).img_type
@@ -96,7 +98,10 @@ typedef struct _tag_ParseData
 extern void metadataparse_init (ParseData * parse_data);
 
 /*
- * offset: number of bytes to jump (just a hint to jump a chunk)
+ * offset: number of bytes that MUST be jumped after current "buf" pointer
+ * next_size: number of minimum amount of bytes required on next step.
+ *            if less than this is provided, the return will be 1 for sure.
+ *            and the offset will be 0 (zero)
  * return:
  *   -1 -> error
  *    0 -> done
diff --git a/ext/metadata/metadataparsejpeg.c b/ext/metadata/metadataparsejpeg.c
index 1a3acb4b..daf7ad27 100644
--- a/ext/metadata/metadataparsejpeg.c
+++ b/ext/metadata/metadataparsejpeg.c
@@ -49,7 +49,8 @@
 
 static int
 metadataparse_jpeg_reading (JpegData * jpeg_data, guint8 ** buf,
-    guint32 * bufsize, guint8 ** next_start, guint32 * next_size);
+    guint32 * bufsize, const guint32 offset, const guint8 * step_buf,
+    guint8 ** next_start, guint32 * next_size);
 
 static int
 metadataparse_jpeg_exif (JpegData * jpeg_data, guint8 ** buf,
@@ -70,14 +71,15 @@ metadataparse_jpeg_jump (JpegData * jpeg_data, guint8 ** buf,
 #define READ(buf, size) ( (size)--, *((buf)++) )
 
 void
-metadataparse_jpeg_init (JpegData * jpeg_data, GstAdapter ** adpt_exif,
-    GstAdapter ** adpt_iptc, GstAdapter ** adpt_xmp)
+metadataparse_jpeg_init (JpegData * jpeg_data, MetadataChunk * exif,
+    MetadataChunk * iptc, MetadataChunk * xmp)
 {
   jpeg_data->state = JPEG_NULL;
-  jpeg_data->adpt_exif = adpt_exif;
-  jpeg_data->adpt_iptc = adpt_iptc;
-  jpeg_data->adpt_xmp = adpt_xmp;
+  jpeg_data->exif = exif;
+  jpeg_data->iptc = iptc;
+  jpeg_data->xmp = xmp;
   jpeg_data->read = 0;
+  jpeg_data->jfif_found = FALSE;
 
   metadataparse_xmp_init ();
 }
@@ -87,18 +89,20 @@ metadataparse_jpeg_dispose (JpegData * jpeg_data)
 {
   metadataparse_xmp_dispose ();
 
-  jpeg_data->adpt_exif = NULL;
-  jpeg_data->adpt_iptc = NULL;
-  jpeg_data->adpt_xmp = NULL;
+  jpeg_data->exif = NULL;
+  jpeg_data->iptc = NULL;
+  jpeg_data->xmp = NULL;
 }
 
 int
 metadataparse_jpeg_parse (JpegData * jpeg_data, guint8 * buf,
-    guint32 * bufsize, guint8 ** next_start, guint32 * next_size)
+    guint32 * bufsize, const guint32 offset, guint8 ** next_start,
+    guint32 * next_size)
 {
 
   int ret = 0;
   guint8 mark[2] = { 0x00, 0x00 };
+  const guint8 *step_buf = buf;
 
   *next_start = buf;
 
@@ -126,8 +130,8 @@ metadataparse_jpeg_parse (JpegData * jpeg_data, guint8 * buf,
     switch (jpeg_data->state) {
       case JPEG_READING:
         ret =
-            metadataparse_jpeg_reading (jpeg_data, &buf, bufsize, next_start,
-            next_size);
+            metadataparse_jpeg_reading (jpeg_data, &buf, bufsize,
+            offset, step_buf, next_start, next_size);
         break;
       case JPEG_JUMPING:
         ret =
@@ -168,13 +172,15 @@ done:
 /* look for markers */
 static int
 metadataparse_jpeg_reading (JpegData * jpeg_data, guint8 ** buf,
-    guint32 * bufsize, guint8 ** next_start, guint32 * next_size)
+    guint32 * bufsize, const guint32 offset, const guint8 * step_buf,
+    guint8 ** next_start, guint32 * next_size)
 {
 
   int ret = -1;
   guint8 mark[2] = { 0x00, 0x00 };
   guint16 chunk_size = 0;
 
+  static const char JfifHeader[] = "JFIF";
   static const unsigned char ExifHeader[] =
       { 0x45, 0x78, 0x69, 0x66, 0x00, 0x00 };
   static const char IptcHeader[] = "Photoshop 3.0";
@@ -211,7 +217,21 @@ metadataparse_jpeg_reading (JpegData * jpeg_data, guint8 ** buf,
     chunk_size = READ (*buf, *bufsize) << 8;
     chunk_size += READ (*buf, *bufsize);
 
-    if (mark[1] == 0xE1) {      /* may be it is Exif or XMP */
+    if (mark[1] == 0xE0) {      /* may be JFIF */
+
+      if (chunk_size >= 16) {
+        if (*bufsize < 14) {
+          *next_size = (*buf - *next_start) + 14;
+          ret = 1;
+          goto done;
+        }
+
+        if (0 == memcmp (JfifHeader, *buf, 5)) {
+          jpeg_data->jfif_found = TRUE;
+        }
+      }
+
+    } else if (mark[1] == 0xE1) {       /* may be it is Exif or XMP */
 
       if (chunk_size >= 8) {    /* size2 'EXIF' 0x00 0x00 */
         guint8 ch;
@@ -222,10 +242,27 @@ metadataparse_jpeg_reading (JpegData * jpeg_data, guint8 ** buf,
           goto done;
         }
 
-        if (jpeg_data->adpt_exif) {
+        if (jpeg_data->exif) {
           if (0 == memcmp (ExifHeader, *buf, 6)) {
+            jpeg_data->exif->offset = (*buf - step_buf) + offset - 4;   /* maker + size */
+            jpeg_data->exif->size = chunk_size + 2;     /* chunk size plus app marker */
             jpeg_data->read = chunk_size - 2;
             ret = 0;
+
+            if (!jpeg_data->jfif_found) {
+              static const guint8 chunk[] = { 0xff, 0xe0, 0x00, 0x10,
+                0x4a, 0x46, 0x49, 0x46, 0x00,
+                0x01, 0x02,
+                0x00, 0x00, 0x01, 0x00, 0x01,
+                0x00, 0x00
+              };
+
+              /* only inject if no JFIF has been found */
+              jpeg_data->exif->size_inject = 18;
+              jpeg_data->exif->buffer = malloc (18);
+              memcpy (jpeg_data->exif->buffer, chunk, 18);
+            }
+
             jpeg_data->state = JPEG_EXIF;
             goto done;
           }
@@ -237,8 +274,10 @@ metadataparse_jpeg_reading (JpegData * jpeg_data, guint8 ** buf,
             goto done;
           }
 
-          if (jpeg_data->adpt_xmp) {
+          if (jpeg_data->xmp) {
             if (0 == memcmp (XmpHeader, *buf, 29)) {
+              jpeg_data->xmp->offset = (*buf - step_buf) + offset - 4;  /* maker + size */
+              jpeg_data->xmp->size = chunk_size + 2;    /* chunk size plus app marker */
               *buf += 29;
               *bufsize -= 29;
               jpeg_data->read = chunk_size - 2 - 29;
@@ -258,8 +297,10 @@ metadataparse_jpeg_reading (JpegData * jpeg_data, guint8 ** buf,
           goto done;
         }
 
-        if (jpeg_data->adpt_iptc) {
+        if (jpeg_data->iptc) {
           if (0 == memcmp (IptcHeader, *buf, 14)) {
+            jpeg_data->iptc->offset = (*buf - step_buf) + offset - 4;   /* maker + size */
+            jpeg_data->iptc->size = chunk_size + 2;     /* chunk size plus app marker */
             jpeg_data->read = chunk_size - 2;
             ret = 0;
             jpeg_data->state = JPEG_IPTC;
@@ -294,9 +335,13 @@ metadataparse_jpeg_exif (JpegData * jpeg_data, guint8 ** buf,
   int ret;
 
   ret = metadataparse_util_hold_chunk (&jpeg_data->read, buf,
-      bufsize, next_start, next_size, jpeg_data->adpt_exif);
+      bufsize, next_start, next_size, &jpeg_data->exif->adapter);
   if (ret == 0) {
+
     jpeg_data->state = JPEG_READING;
+
+    /* if there is a second Exif chunk in the file it will be jumped */
+    jpeg_data->exif = NULL;
   }
   return ret;
 
@@ -310,7 +355,7 @@ metadataparse_jpeg_iptc (JpegData * jpeg_data, guint8 ** buf,
   int ret;
 
   ret = metadataparse_util_hold_chunk (&jpeg_data->read, buf,
-      bufsize, next_start, next_size, jpeg_data->adpt_iptc);
+      bufsize, next_start, next_size, &jpeg_data->iptc->adapter);
 
 
   if (ret == 0) {
@@ -322,8 +367,8 @@ metadataparse_jpeg_iptc (JpegData * jpeg_data, guint8 ** buf,
 
     jpeg_data->state = JPEG_READING;
 
-    size = gst_adapter_available (*jpeg_data->adpt_iptc);
-    buf = gst_adapter_peek (*jpeg_data->adpt_iptc, size);
+    size = gst_adapter_available (jpeg_data->iptc->adapter);
+    buf = gst_adapter_peek (jpeg_data->iptc->adapter, size);
 
     res = iptc_jpeg_ps3_find_iptc (buf, size, &iptc_len);
 
@@ -332,19 +377,22 @@ metadataparse_jpeg_iptc (JpegData * jpeg_data, guint8 ** buf,
       ret = -1;
     } else if (res == 0) {
       /* no iptc data found */
-      gst_adapter_clear (*jpeg_data->adpt_iptc);
+      gst_adapter_clear (jpeg_data->iptc->adapter);
     } else {
-      gst_adapter_flush (*jpeg_data->adpt_iptc, res);
-      size = gst_adapter_available (*jpeg_data->adpt_iptc);
+      gst_adapter_flush (jpeg_data->iptc->adapter, res);
+      size = gst_adapter_available (jpeg_data->iptc->adapter);
       if (size > iptc_len) {
         GstBuffer *buf;
 
-        buf = gst_adapter_take_buffer (*jpeg_data->adpt_iptc, iptc_len);
-        gst_adapter_clear (*jpeg_data->adpt_iptc);
-        gst_adapter_push (*jpeg_data->adpt_iptc, buf);
+        buf = gst_adapter_take_buffer (jpeg_data->iptc->adapter, iptc_len);
+        gst_adapter_clear (jpeg_data->iptc->adapter);
+        gst_adapter_push (jpeg_data->iptc->adapter, buf);
       }
     }
 
+    /* if there is a second Iptc chunk in the file it will be jumped */
+    jpeg_data->iptc = NULL;
+
   }
 
   return ret;
@@ -358,10 +406,12 @@ metadataparse_jpeg_xmp (JpegData * jpeg_data, guint8 ** buf,
   int ret;
 
   ret = metadataparse_util_hold_chunk (&jpeg_data->read, buf,
-      bufsize, next_start, next_size, jpeg_data->adpt_xmp);
+      bufsize, next_start, next_size, &jpeg_data->xmp->adapter);
 
   if (ret == 0) {
     jpeg_data->state = JPEG_READING;
+    /* if there is a second XMP chunk in the file it will be jumped */
+    jpeg_data->xmp = NULL;
   }
   return ret;
 }
diff --git a/ext/metadata/metadataparsejpeg.h b/ext/metadata/metadataparsejpeg.h
index d7f1660d..cc7cd6e2 100644
--- a/ext/metadata/metadataparsejpeg.h
+++ b/ext/metadata/metadataparsejpeg.h
@@ -44,7 +44,7 @@
 #ifndef __METADATAPARSE_JPEG_H__
 #define __METADATAPARSE_JPEG_H__
 
-#include <gst/base/gstadapter.h>
+#include "metadataparsetypes.h"
 
 G_BEGIN_DECLS
 
@@ -63,23 +63,24 @@ typedef enum _tag_JpegState
 typedef struct _tag_JpegData
 {
   JpegState state;
-  GstAdapter **adpt_exif;
-  GstAdapter **adpt_iptc;
-  GstAdapter **adpt_xmp;
+  MetadataChunk *exif;
+  MetadataChunk *iptc;
+  MetadataChunk *xmp;
   guint32 read;
+  gboolean jfif_found;
 } JpegData;
 
 
 extern void
-metadataparse_jpeg_init (JpegData * jpeg_data, GstAdapter ** adpt_exif,
-    GstAdapter ** adpt_iptc, GstAdapter ** adpt_xmp);
+metadataparse_jpeg_init (JpegData * jpeg_data, MetadataChunk * adpt_exif,
+    MetadataChunk * adpt_iptc, MetadataChunk * adpt_xmp);
 
 extern void metadataparse_jpeg_dispose (JpegData * jpeg_data);
 
 
 int
 metadataparse_jpeg_parse (JpegData * jpeg_data, guint8 * buf,
-    guint32 * bufsize, guint8 ** next_start, guint32 * next_size);
+    guint32 * bufsize, const guint32 offset, guint8 ** next_start, guint32 * next_size);
 
 G_END_DECLS
 #endif /* __METADATAPARSE_JPEG_H__ */
diff --git a/ext/metadata/metadataparsepng.c b/ext/metadata/metadataparsepng.c
index 9c3241cf..829ad65e 100644
--- a/ext/metadata/metadataparsepng.c
+++ b/ext/metadata/metadataparsepng.c
@@ -47,7 +47,8 @@
 
 static int
 metadataparse_png_reading (PngData * png_data, guint8 ** buf,
-    guint32 * bufsize, guint8 ** next_start, guint32 * next_size);
+    guint32 * bufsize, const guint32 offset, const guint8 * step_buf,
+    guint8 ** next_start, guint32 * next_size);
 
 static int
 metadataparse_png_xmp (PngData * png_data, guint8 ** buf,
@@ -60,11 +61,11 @@ metadataparse_png_jump (PngData * png_data, guint8 ** buf,
 #define READ(buf, size) ( (size)--, *((buf)++) )
 
 void
-metadataparse_png_init (PngData * png_data, GstAdapter ** adpt_exif,
-    GstAdapter ** adpt_iptc, GstAdapter ** adpt_xmp)
+metadataparse_png_init (PngData * png_data, MetadataChunk * exif,
+    MetadataChunk * iptc, MetadataChunk * xmp)
 {
   png_data->state = PNG_NULL;
-  png_data->adpt_xmp = adpt_xmp;
+  png_data->xmp = xmp;
   png_data->read = 0;
 
   metadataparse_xmp_init ();
@@ -75,16 +76,18 @@ metadataparse_png_dispose (PngData * png_data)
 {
   metadataparse_xmp_dispose ();
 
-  png_data->adpt_xmp = NULL;
+  png_data->xmp = NULL;
 }
 
 int
 metadataparse_png_parse (PngData * png_data, guint8 * buf,
-    guint32 * bufsize, guint8 ** next_start, guint32 * next_size)
+    guint32 * bufsize, const guint32 offset, guint8 ** next_start,
+    guint32 * next_size)
 {
 
   int ret = 0;
   guint8 mark[8];
+  const guint8 *step_buf = buf;
 
   *next_start = buf;
 
@@ -120,8 +123,8 @@ metadataparse_png_parse (PngData * png_data, guint8 * buf,
     switch (png_data->state) {
       case PNG_READING:
         ret =
-            metadataparse_png_reading (png_data, &buf, bufsize, next_start,
-            next_size);
+            metadataparse_png_reading (png_data, &buf, bufsize,
+            offset, step_buf, next_start, next_size);
         break;
       case PNG_JUMPING:
         ret =
@@ -152,7 +155,8 @@ done:
 /* look for markers */
 static int
 metadataparse_png_reading (PngData * png_data, guint8 ** buf,
-    guint32 * bufsize, guint8 ** next_start, guint32 * next_size)
+    guint32 * bufsize, const guint32 offset, const guint8 * step_buf,
+    guint8 ** next_start, guint32 * next_size)
 {
 
   int ret = -1;
@@ -193,8 +197,10 @@ metadataparse_png_reading (PngData * png_data, guint8 ** buf,
         goto done;
       }
 
-      if (png_data->adpt_xmp) {
+      if (png_data->xmp) {
         if (0 == memcmp (XmpHeader, *buf, 18)) {
+          png_data->xmp->offset = (*buf - step_buf) + offset - 8;       /* maker + size */
+          png_data->xmp->size = chunk_size + 12;        /* chunk size plus app marker plus crc */
           *buf += 22;           /* jump "XML:com.adobe.xmp" plus some flags */
           *bufsize -= 22;
           png_data->read = chunk_size - 22;     /* four CRC bytes at the end will be jumped after */
@@ -234,11 +240,13 @@ metadataparse_png_xmp (PngData * png_data, guint8 ** buf,
   int ret;
 
   ret = metadataparse_util_hold_chunk (&png_data->read, buf,
-      bufsize, next_start, next_size, png_data->adpt_xmp);
+      bufsize, next_start, next_size, &png_data->xmp->adapter);
   if (ret == 0) {
     /* jump four CRC bytes at the end of chunk */
     png_data->read = 4;
     png_data->state = PNG_JUMPING;
+    /* if there is a second XMP chunk in the file it will be jumped */
+    png_data->xmp = NULL;
   }
   return ret;
 
diff --git a/ext/metadata/metadataparsepng.h b/ext/metadata/metadataparsepng.h
index 99f0f7ea..c059450f 100644
--- a/ext/metadata/metadataparsepng.h
+++ b/ext/metadata/metadataparsepng.h
@@ -44,7 +44,7 @@
 #ifndef __METADATAPARSE_PNG_H__
 #define __METADATAPARSE_PNG_H__
 
-#include <gst/base/gstadapter.h>
+#include "metadataparsetypes.h"
 
 G_BEGIN_DECLS
 
@@ -61,21 +61,21 @@ typedef enum _tag_PngState
 typedef struct _tag_PngData
 {
   PngState state;
-  GstAdapter **adpt_xmp;
+  MetadataChunk *xmp;
   guint32 read;
 } PngData;
 
 
 extern void
-metadataparse_png_init (PngData * png_data, GstAdapter ** adpt_exif,
-    GstAdapter ** adpt_iptc, GstAdapter ** adpt_xmp);
+metadataparse_png_init (PngData * png_data, MetadataChunk *exif,
+    MetadataChunk * iptc, MetadataChunk *xmp);
 
 extern void metadataparse_png_dispose (PngData * png_data);
 
 
 int
 metadataparse_png_parse (PngData * png_data, guint8 * buf,
-    guint32 * bufsize, guint8 ** next_start, guint32 * next_size);
+    guint32 * bufsize, const guint32 offset, guint8 ** next_start, guint32 * next_size);
 
 G_END_DECLS
 #endif /* __METADATAPARSE_PNG_H__ */
diff --git a/ext/metadata/metadataparsetypes.h b/ext/metadata/metadataparsetypes.h
new file mode 100644
index 00000000..7fd74fb4
--- /dev/null
+++ b/ext/metadata/metadataparsetypes.h
@@ -0,0 +1,64 @@
+/*
+ * 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.
+ */
+
+#ifndef __METADATAPARSETYPES_H__
+#define __METADATAPARSETYPES_H__
+
+#include <gst/base/gstadapter.h>
+
+G_BEGIN_DECLS
+
+typedef struct _tag_MetadataChunk
+{
+  gint64 offset;               /* from the beginning of file */
+  guint32 size;                 /* size of bytes in chunk (same as adapter size) */
+  GstAdapter *adapter;
+  /* in some cases, when there is JPEG/EXIF, and no JIF as first chunk
+     is is need to add a chunk data back to the file */
+  guint32 size_inject;          /* same as buffer size */
+  guint8 * buffer;
+} MetadataChunk;
+
+
+G_END_DECLS
+#endif /* __METADATAPARSETYPES_H__ */