gst/matroska/: Make sure that every Tags element is only parsed once and it's containing tags are only posted once.

Original commit message from CVS:
* gst/matroska/ebml-read.c:
* gst/matroska/ebml-read.h:
* gst/matroska/matroska-demux.c: (gst_matroska_demux_reset),
(gst_matroska_demux_parse_metadata):
* gst/matroska/matroska-demux.h:
Make sure that every Tags element is only parsed once and it's
containing tags are only posted once.

5 files changed, 51 insertions, 1 deletions

diff --git a/ChangeLog b/ChangeLog
index 3c3777ff..3c541eb3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,15 @@
 2008-06-15  Sebastian Dröge  <slomo@circular-chaos.org>
 
+	* gst/matroska/ebml-read.c:
+	* gst/matroska/ebml-read.h:
+	* gst/matroska/matroska-demux.c: (gst_matroska_demux_reset),
+	(gst_matroska_demux_parse_metadata):
+	* gst/matroska/matroska-demux.h:
+	Make sure that every Tags element is only parsed once and it's
+	containing tags are only posted once.
+
+2008-06-15  Sebastian Dröge  <slomo@circular-chaos.org>
+
 	* gst/matroska/ebml-read.c: (gst_ebml_peek_id),
 	(gst_ebml_read_header):
 	* gst/matroska/matroska-demux.c: (gst_matroska_demux_add_stream),
diff --git a/gst/matroska/ebml-read.c b/gst/matroska/ebml-read.c
index fce3ff61..87d62345 100644
--- a/gst/matroska/ebml-read.c
+++ b/gst/matroska/ebml-read.c
@@ -75,7 +75,7 @@ gst_ebml_read_get_type (void)
   return gst_ebml_read_type;
 }
 
-static void
+void
 gst_ebml_level_free (GstEbmlLevel * level)
 {
   g_slice_free (GstEbmlLevel, level);
diff --git a/gst/matroska/ebml-read.h b/gst/matroska/ebml-read.h
index 54782b25..2d5a5a13 100644
--- a/gst/matroska/ebml-read.h
+++ b/gst/matroska/ebml-read.h
@@ -61,6 +61,8 @@ typedef struct _GstEbmlReadClass {
 
 GType    gst_ebml_read_get_type          (void);
 
+void          gst_ebml_level_free        (GstEbmlLevel *level);
+
 GstFlowReturn gst_ebml_peek_id           (GstEbmlRead *ebml,
                                           guint       *level_up,
                                           guint32     *id);
diff --git a/gst/matroska/matroska-demux.c b/gst/matroska/matroska-demux.c
index 4cbef285..409c6c59 100644
--- a/gst/matroska/matroska-demux.c
+++ b/gst/matroska/matroska-demux.c
@@ -312,6 +312,10 @@ gst_matroska_demux_reset (GstElement * element)
   demux->tracks_parsed = FALSE;
   demux->segmentinfo_parsed = FALSE;
 
+  g_list_foreach (demux->tags_parsed, (GFunc) gst_ebml_level_free, NULL);
+  g_list_free (demux->tags_parsed);
+  demux->tags_parsed = NULL;
+
   gst_segment_init (&demux->segment, GST_FORMAT_TIME);
 }
 
@@ -2318,6 +2322,39 @@ gst_matroska_demux_parse_metadata (GstMatroskaDemux * demux,
 
   guint32 id;
 
+  GList *l;
+
+  GstEbmlLevel *curlevel;
+
+  /* Can't be NULL at this point */
+  g_assert (ebml->level != NULL);
+  curlevel = ebml->level->data;
+
+  /* Make sure we don't parse a tags element twice and
+   * post it's tags twice */
+  for (l = demux->tags_parsed; l; l = l->next) {
+    GstEbmlLevel *level = l->data;
+
+    if (ebml->level)
+      curlevel = ebml->level->data;
+    else
+      break;
+
+    if (level->start == curlevel->start && level->length == curlevel->length) {
+      GST_DEBUG_OBJECT (demux, "Skipping already parsed Tags at offset %"
+          G_GUINT64_FORMAT, ebml->offset);
+      ret = gst_ebml_read_skip (ebml);
+      return ret;
+    }
+  }
+
+  GST_DEBUG_OBJECT (demux, "Parsing Tags at offset %" G_GUINT64_FORMAT,
+      ebml->offset);
+  /* TODO: g_slice_dup() if we depend on GLib 2.14 */
+  curlevel = g_slice_new (GstEbmlLevel);
+  memcpy (curlevel, ebml->level->data, sizeof (GstEbmlLevel));
+  demux->tags_parsed = g_list_prepend (demux->tags_parsed, curlevel);
+
   /* TODO: review length/eos logic */
   if (prevent_eos) {
     length = gst_ebml_read_get_length (ebml);
diff --git a/gst/matroska/matroska-demux.h b/gst/matroska/matroska-demux.h
index 413cdc8a..8ea9c3ac 100644
--- a/gst/matroska/matroska-demux.h
+++ b/gst/matroska/matroska-demux.h
@@ -81,6 +81,7 @@ typedef struct _GstMatroskaDemux {
   gboolean                 index_parsed;
   gboolean                 tracks_parsed;
   gboolean                 segmentinfo_parsed;
+  GList                   *tags_parsed;
 
   /* start-of-segment */
   guint64                  ebml_segment_start;