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diff --git a/gst/matroska/matroska-mux.h b/gst/matroska/matroska-mux.h
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+++ b/gst/matroska/matroska-mux.h
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+/* GStreamer Matroska muxer/demuxer
+ * (c) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
+ * (c) 2005 Michal Benes <michal.benes@xeris.cz>
+ *
+ * matroska-mux.h: matroska file/stream muxer object types
+ *
+ * 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., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __GST_MATROSKA_MUX_H__
+#define __GST_MATROSKA_MUX_H__
+
+#include <gst/gst.h>
+#include <gst/base/gstcollectpads.h>
+
+#include "ebml-write.h"
+#include "matroska-ids.h"
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_MATROSKA_MUX \
+  (gst_matroska_mux_get_type ())
+#define GST_MATROSKA_MUX(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_MATROSKA_MUX, GstMatroskaMux))
+#define GST_MATROSKA_MUX_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_MATROSKA_MUX, GstMatroskaMuxClass))
+#define GST_IS_MATROSKA_MUX(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_MATROSKA_MUX))
+#define GST_IS_MATROSKA_MUX_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_MATROSKA_MUX))
+
+typedef enum {
+  GST_MATROSKA_MUX_STATE_START,
+  GST_MATROSKA_MUX_STATE_HEADER,
+  GST_MATROSKA_MUX_STATE_DATA,
+} GstMatroskaMuxState;
+
+typedef struct _GstMatroskaMetaSeekIndex {
+  guint32  id;
+  guint64  pos;
+} GstMatroskaMetaSeekIndex;
+
+typedef gboolean (*GstMatroskaCapsFunc) (GstPad *pad, GstCaps *caps);
+
+/* all information needed for one matroska stream */
+typedef struct
+{
+  GstCollectData collect;       /* we extend the CollectData */
+  GstMatroskaCapsFunc capsfunc;
+  GstMatroskaTrackContext *track;
+
+  guint64 duration;
+  GstClockTime start_ts;
+  GstClockTime end_ts;    /* last timestamp + (if available) duration */
+  guint64 default_duration_scaled;
+}
+GstMatroskaPad;
+
+
+typedef struct _GstMatroskaMux {
+  GstElement     element;
+  
+  /* < private > */
+
+  /* pads */
+  GstPad        *srcpad;
+  GstCollectPads *collect;
+  GstEbmlWrite *ebml_write;
+
+  guint          num_streams,
+                 num_v_streams, num_a_streams, num_t_streams;
+
+  /* Application name (for the writing application header element) */
+  gchar          *writing_app;
+
+  /* EBML DocType. */
+  const gchar    *doctype;
+
+  /* DocType version. */
+  guint          doctype_version;
+
+  /* state */
+  GstMatroskaMuxState state;
+
+  /* a cue (index) table */
+  GstMatroskaIndex *index;
+  guint          num_indexes;
+  GstClockTimeDiff min_index_interval;
+  gboolean       streamable;
+ 
+  /* timescale in the file */
+  guint64        time_scale;
+  /* based on timescale, limit of nanoseconds you can have in a cluster */ 
+  guint64        max_cluster_duration;
+
+  /* length, position (time, ns) */
+  guint64        duration;
+
+  /* byte-positions of master-elements (for replacing contents) */
+  guint64        segment_pos,
+                 seekhead_pos,
+                 cues_pos,
+                 chapters_pos,
+                 tags_pos,
+                 info_pos,
+                 tracks_pos,
+                 duration_pos,
+                 meta_pos;
+  guint64        segment_master;
+
+  /* current cluster */
+  guint64        cluster,
+                 cluster_time,
+                 cluster_pos,
+		 prev_cluster_size;
+
+  /* GstForceKeyUnit event */
+  GstEvent       *force_key_unit_event;
+
+  /* Flag to ease handling of WebM specifics */
+  gboolean is_webm;
+
+  /* used uids */
+  GArray *used_uids;
+} GstMatroskaMux;
+
+typedef struct _GstMatroskaMuxClass {
+  GstElementClass parent;
+} GstMatroskaMuxClass;
+
+GType   gst_matroska_mux_get_type (void);
+
+G_END_DECLS
+
+#endif /* __GST_MATROSKA_MUX_H__ */