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diff --git a/src/iso11172-1.h b/src/iso11172-1.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            iso11172-1.h
+ *
+ *  Wed Aug 31 13:48:30 CEST 2005
+ *  Copyright  2005 Bent Bisballe Nyeng
+ *  deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ *  This file is part of MIaV.
+ *
+ *  MIaV is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  MIaV 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with MIaV; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+
+/*
+ *  This file contains symbols used to create an ISO11172-1 compatible multiplexed 
+ *  MPEG stream.
+ */
+
+#include "config.h"
+#ifndef __MIAV_ISO11172_1_H__
+#define __MIAV_ISO11172_1_H__
+
+#define CLOCK_90KHZ 90000
+
+namespace ISO11172_1 {
+  ////////////////////////////////////////////////////
+  // Constants
+  ////////////////////////////////////////////////////
+  const char pack_start_code[]          = "\x00\x00\x01\xBA";
+  const char system_header_start_code[] = "\x00\x00\x01\xBB";
+  const char packet_start_code_prefix[] = "\x00\x00\x01";
+  const char stream_id_video1[]         = "\xE3";
+  const char stream_id_video2[]         = "\xE4";
+  const char stream_id_video3[]         = "\xE5";
+  const char stream_id_video4[]         = "\xE6";
+  const char stream_id_video5[]         = "\xE7";
+  const char stream_id_video6[]         = "\xE8";
+  const char stream_id_video7[]         = "\xE9";
+  const char stream_id_video8[]         = "\xEA";
+  const char stream_id_audio1[]         = "\xC0";
+  const char stream_id_audio2[]         = "\xC1";
+  const char stream_id_audio3[]         = "\xC2";
+  const char stream_id_audio4[]         = "\xC3";
+  const char stream_id_audio5[]         = "\xC4";
+  const char stream_id_audio6[]         = "\xC5";
+  const char stream_id_audio7[]         = "\xC6";
+  const char stream_id_audio8[]         = "\xC7";
+  const char stream_id_padding[]        = "\xBE";
+  const char end_code[]                 = "\x00\x00\x01\xB9";
+
+  ////////////////////////////////////////////////////
+  // Methods
+  ////////////////////////////////////////////////////
+  /**
+   * SCR stands for System Clock Reference
+   */
+  inline unsigned int SCR(unsigned int previous_SCR,
+                          unsigned int pack_header_size,
+                          unsigned int packets_per_pack,
+                          unsigned int packet_data_size,
+                          unsigned int Rmux)
+  {
+    // To prevent a crash when doing division.
+    if(Rmux == 0) Rmux = 1;
+    return previous_SCR + (unsigned int)((double)(pack_header_size + 
+                                                  (packets_per_pack * packet_data_size)) * 
+                                         (double)CLOCK_90KHZ / (double)Rmux);
+  }
+
+  /**
+   * Calculates Rmux according to subclause A.5.4
+   * mux stands for multiplexing and R for Rate,
+   * so Rmux is the rate of the multiplexing.
+   */
+  inline unsigned int Rmux(unsigned int video_data_rate,
+                           unsigned int audio_data_rate,
+                           unsigned int packet_header_size,
+                           unsigned int pack_header_size,
+                           unsigned int packets_per_pack,
+                           unsigned int packet_data_size)
+  {
+    // To prevent a crash when doing division.
+    if(packets_per_pack == 0) packets_per_pack = 1;
+    if(packet_data_size == 0) packet_data_size = 1;
+    
+    return (unsigned int)(
+                          ((double)video_data_rate + (double)audio_data_rate) *
+                          (1.0 + ((double)packet_header_size + (double)pack_header_size / (double)packets_per_pack) 
+                           / (double)packet_data_size)
+                          );
+  }
+
+  
+};
+
+#endif/*__MIAV_ISO11172_1_H__*/