Created new plugin ('medadata') and element ('metadataparse') that extract metadata from images (look at bug #486659).

Original commit message from CVS:
Created new plugin ('medadata') and element ('metadataparse') that extract metadata from images (look at bug #486659).

1 files changed, 129 insertions, 0 deletions

diff --git a/ext/metadata/metadataparseexif.c b/ext/metadata/metadataparseexif.c
new file mode 100644
index 00000000..abd9f50a
--- /dev/null
+++ b/ext/metadata/metadataparseexif.c
@@ -0,0 +1,129 @@
+/*
+ * 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.
+ */
+
+#include "metadataparseexif.h"
+
+GST_DEBUG_CATEGORY (gst_metadata_parse_exif_debug);
+#define GST_CAT_DEFAULT gst_metadata_parse_exif_debug
+
+#ifndef HAVE_EXIF
+
+void
+metadataparse_exif_dump (GstAdapter * adapter)
+{
+
+  GST_LOG ("EXIF not defined, here I should send just one tag as whole chunk");
+
+}
+
+#else /* ifndef HAVE_EXIF */
+
+#include <libexif/exif-data.h>
+
+static void
+exif_data_foreach_content_func (ExifContent * content, void *callback_data);
+
+static void exif_content_foreach_entry_func (ExifEntry * entry, void *);
+
+void
+metadataparse_exif_dump (GstAdapter * adapter)
+{
+  const guint8 *buf;
+  guint32 size;
+  ExifData *exif = NULL;
+
+  if (adapter == NULL || (size = gst_adapter_available (adapter)) == 0) {
+    goto done;
+  }
+
+  buf = gst_adapter_peek (adapter, size);
+
+  exif = exif_data_new_from_data (buf, size);
+  if (exif == NULL) {
+    goto done;
+  }
+
+  exif_data_foreach_content (exif, exif_data_foreach_content_func,
+      (void *) NULL /* app data */ );
+
+done:
+
+  if (exif)
+    exif_data_unref (exif);
+
+  return;
+
+}
+
+static void
+exif_data_foreach_content_func (ExifContent * content, void *callback_data)
+{
+  ExifIfd ifd = exif_content_get_ifd (content);
+
+  GST_LOG ("\n  Content %p: %s (ifd=%d)", content, exif_ifd_get_name (ifd),
+      ifd);
+  exif_content_foreach_entry (content, exif_content_foreach_entry_func,
+      callback_data);
+}
+
+static void
+exif_content_foreach_entry_func (ExifEntry * entry, void *unused)
+{
+  char buf[2048];
+
+  GST_LOG ("\n    Entry %p: %s (%s)\n"
+      "      Size, Comps: %d, %d\n"
+      "      Value: %s\n"
+      "      Title: %s\n"
+      "      Description: %s\n",
+      entry,
+      exif_tag_get_name_in_ifd (entry->tag, EXIF_IFD_0),
+      exif_format_get_name (entry->format),
+      entry->size,
+      (int) (entry->components),
+      exif_entry_get_value (entry, buf, sizeof (buf)),
+      exif_tag_get_title_in_ifd (entry->tag, EXIF_IFD_0),
+      exif_tag_get_description_in_ifd (entry->tag, EXIF_IFD_0));
+}
+
+#endif /* else (ifndef HAVE_EXIF) */