diff --git a/media/event/muxer_listener.h b/media/event/muxer_listener.h
new file mode 100644
index 0000000000..a82d7c7cbe
--- /dev/null
+++ b/media/event/muxer_listener.h
@@ -0,0 +1,63 @@
+// Event handler for events fired by Muxer.
+#ifndef MEDIA_EVENT_MUXER_LISTENER_H_
+#define MEDIA_EVENT_MUXER_LISTENER_H_
+
+#include <vector>
+
+#include "base/basictypes.h"
+
+namespace media {
+
+class MuxerOptions;
+class StreamInfo;
+
+namespace event {
+
+class MuxerListener {
+ public:
+  MuxerListener() {};
+  virtual ~MuxerListener() {};
+
+  // Called when muxing starts. This event happens before any other events.
+  // For MPEG DASH Live profile, the initialization segment information is
+  // available from StreamInfo.
+  // |time_scale| is a reference time scale regardless of the time scale(s)
+  // specified in |stream_infos|.
+  virtual void OnMediaStart(const MuxerOptions& muxer_options,
+                            const std::vector<StreamInfo*>& stream_infos,
+                            uint32 time_scale) = 0;
+
+  // Called when all files are written out and the muxer object does not output
+  // any more files.
+  // Note: This event might not be very interesting to MPEG DASH Live profile.
+  // |init_range_{start,end}| is the byte range of initialization segment, in
+  // the media file. If |has_init_range| is false, these values are ignored.
+  // |index_range_{start,end}| is the byte range of segment index, in the media
+  // file. If |has_index_range| is false, these values are ignored.
+  // Both ranges are inclusive.
+  // Media length of |duration_seconds|.
+  // |file_size| of the media in bytes.
+  virtual void OnMediaEnd(const std::vector<StreamInfo*>& stream_infos,
+                          bool has_init_range,
+                          uint64 init_range_start,
+                          uint64 init_range_end,
+                          bool has_index_range,
+                          uint64 index_range_start,
+                          uint64 index_range_end,
+                          float duration_seconds,
+                          uint64 file_size) = 0;
+
+  // Called when a segment has been muxed and the file has been written.
+  // Note: For video on demand (VOD), this would be for subsegments.
+  // |start_time| and |duration| are relative to time scale specified
+  // OnMediaStart().
+  // |segment_file_size| in bytes.
+  virtual void OnNewSegment(uint64 start_time,
+                            uint64 duration,
+                            uint64 segment_file_size) = 0;
+};
+
+}  // namespace event
+}  // namespace media
+
+#endif  // MEDIA_EVENT_MUXER_LISTENER_H_