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diff --git a/src/S12MTimecode.h b/src/S12MTimecode.h
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+/*
+Copyright (c) 2007, John Hurst
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+3. The name of the author may not be used to endorse or promote products
+   derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+/*! \file    S12MTimecode.cpp
+    \version $Id$       
+    \brief   AS-DCP library, Timecode PCM essence reader and writer implementation
+*/
+
+/*
+
+  DROP-FRAME NOT SUPPORTED!
+
+*/
+
+#ifndef _S12MTIMECODE_H_
+#define _S12MTIMECODE_H_
+
+#include "KM_util.h"
+#include "KM_memio.h"
+
+namespace ASDCP {
+
+ class S12MTimecode : public Kumu::IArchive
+{
+  ui32_t m_FrameCount;
+  ui32_t m_FPS;
+
+public:
+  S12MTimecode() : m_FrameCount(0), m_FPS(0) {}
+
+  S12MTimecode(ui32_t frame_count, ui32_t fps) : m_FrameCount(frame_count), m_FPS(fps) {}
+
+  S12MTimecode(const std::string& tc, ui32_t fps) : m_FrameCount(0), m_FPS(fps)
+  {
+    DecodeString(tc);
+  }
+
+  S12MTimecode(const S12MTimecode& rhs) : m_FrameCount(0), m_FPS(0)
+  {
+    m_FPS = rhs.m_FPS;
+    m_FrameCount = rhs.m_FrameCount;
+  }
+
+  ~S12MTimecode() {}
+
+  const S12MTimecode& operator=(const S12MTimecode& rhs)
+  {
+    assert(m_FPS != 0);
+    m_FrameCount = rhs.m_FrameCount;
+    return *this;
+  }
+
+  inline void   SetFPS(ui32_t fps) { m_FPS = fps; }
+  inline ui32_t GetFPS() const { return m_FPS; }
+
+  inline void   SetFrames(ui32_t frame_count) { m_FrameCount = frame_count; }
+  inline ui32_t GetFrames() const { return m_FrameCount; }
+
+  inline bool operator==(const S12MTimecode& rhs) const { return m_FrameCount == rhs.m_FrameCount; }
+  inline bool operator<(const S12MTimecode& rhs) const { return m_FrameCount < rhs.m_FrameCount; }
+
+  inline const S12MTimecode operator+(const S12MTimecode& rhs){
+    assert(m_FPS > 0);
+    assert(m_FPS == rhs.m_FPS);
+    return S12MTimecode(m_FrameCount + rhs.m_FrameCount, m_FPS);
+  }
+
+  inline const S12MTimecode operator-(const S12MTimecode& rhs){
+    assert(m_FPS > 0);
+    assert(m_FPS == rhs.m_FPS);
+    return S12MTimecode(m_FrameCount + rhs.m_FrameCount, m_FPS);
+  }
+
+
+  void DecodeString(const std::string& tc)
+  {
+    assert(m_FPS > 0);
+    const char* p = tc.c_str();
+
+    while ( *p != 0 && ! isdigit(*p) )
+      p++;
+
+    if ( *p != 0 )
+      {
+	ui32_t hours = atoi(p);
+	ui32_t minutes = atoi(p+3);
+	ui32_t seconds = atoi(p+6);
+	ui32_t frames = atoi(p+9);
+
+	m_FrameCount = (((((hours * 60) + minutes) * 60) + seconds) * m_FPS)+ frames;
+      }
+  }
+
+  const char* EncodeString(char* buf, ui32_t buf_len)
+  {
+    assert(m_FPS > 0);
+    ui32_t frames = m_FrameCount % m_FPS;
+    m_FrameCount /= m_FPS;
+    ui32_t seconds = m_FrameCount % 60;
+    m_FrameCount /= 60;
+    ui32_t minutes = m_FrameCount % 60;
+    ui32_t hours = m_FrameCount / 60;
+
+    snprintf(buf, buf_len, "%02d:%02d:%02d:%02d", hours, minutes, seconds, frames);
+    return buf;
+  }
+
+  // IArchive
+  bool HasValue() const { return (m_FPS > 0); }
+
+  bool Archive(Kumu::MemIOWriter* Writer) const
+  {
+    if ( ! Writer->WriteUi32BE(m_FPS) ) return false;
+    if ( ! Writer->WriteUi32BE(m_FrameCount) ) return false;
+    return true;
+  }
+
+  bool Unarchive(Kumu::MemIOReader* Reader)
+  {
+    if ( ! Reader->ReadUi32BE(&m_FPS) ) return false;
+    if ( ! Reader->ReadUi32BE(&m_FrameCount) ) return false;
+    return true;
+  }
+};
+
+
+} // namespace ASDCP
+
+#endif // _S12MTIMECODE_H_
+
+//
+// end S12MTimecode.h
+//