1 files changed, 170 insertions, 0 deletions
diff --git a/mpeglib/lib/mpegplay/gop.cpp b/mpeglib/lib/mpegplay/gop.cpp
new file mode 100644
index 00000000..b2199070
--- /dev/null
+++ b/mpeglib/lib/mpegplay/gop.cpp
@@ -0,0 +1,170 @@
+/*
+  parse/stores GOP (group of picture) information from a mpegVideoStream
+  Copyright (C) 2000  Martin Vogt
+
+  This program 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.
+
+  For more information look at the file COPYRIGHT in this package
+
+ */
+
+
+#include "gop.h"
+
+#include <iostream>
+
+using namespace std;
+
+GOP::GOP() {
+  drop_flag=false;
+  tc_hours=0;
+  tc_minutes=0;
+  tc_seconds=0;
+  tc_pictures=0;
+  closed_gop=false;
+  broken_link=false;
+ 
+  mpegExtension=new MpegExtension();
+
+}
+
+
+GOP::~GOP() {
+  delete mpegExtension;
+}
+
+
+/*
+ *--------------------------------------------------------------
+ *
+ * ParseGOP --
+ *
+ *      Parses of group of pictures header from bit stream
+ *      associated with vid_stream.
+ *
+ * Results:
+ *      Values in gop header placed into video stream structure.
+ *
+ * Side effects:
+ *      Bit stream irreversibly parsed.
+ *
+ *--------------------------------------------------------------
+ */
+int GOP::processGOP(MpegVideoStream* mpegVideoStream) {
+  unsigned int data;
+
+  /* Flush group of pictures start code. */
+
+  mpegVideoStream->flushBits(32);
+
+  /* Parse off drop frame flag. */
+
+  data=mpegVideoStream->getBits(1);
+
+  if (data) {
+    drop_flag = true;
+  } else
+    drop_flag = false;
+
+  /* Parse off hour component of time code. */
+
+  tc_hours=mpegVideoStream->getBits(5);
+
+  /* Parse off minute component of time code. */
+
+  tc_minutes=mpegVideoStream->getBits(6);
+
+
+  /* Flush marker bit. */
+
+  mpegVideoStream->flushBits(1);
+
+  /* Parse off second component of time code. */
+
+  tc_seconds=mpegVideoStream->getBits(6);
+  
+  /* Parse off picture count component of time code. */
+
+  tc_pictures=mpegVideoStream->getBits(6);
+
+  /* Parse off closed gop and broken link flags. */
+  data=mpegVideoStream->getBits(2);
+  if (data > 1) {
+    closed_gop = true;
+    if (data > 2) {
+      broken_link = true;
+    } else
+      broken_link = false;
+  } else {
+    closed_gop = false;
+    if (data) {
+      broken_link = true;
+    } else
+      broken_link = false;
+  }
+
+
+  /*
+   * If next start code is extension/user start code, 
+   * parse off extension data.
+   */
+
+  mpegExtension->processExtensionData(mpegVideoStream);
+
+  return true; 
+}
+
+  
+  
+int GOP::substract(GOP* minus,GOP* dest) {
+  int hours;
+  int minutes;
+  int seconds;
+  hours=getHour()-minus->getHour();
+  minutes=getMinutes()-minus->getMinutes();
+  seconds=getSeconds()-minus->getSeconds();
+
+  if (seconds < 0) {
+    seconds+=60;
+    minutes--;
+  }
+  if (minutes < 0) {
+    minutes+=60;
+    hours--;
+  }
+  dest->tc_hours=hours;
+  dest->tc_minutes=minutes;
+  dest->tc_seconds=seconds;
+  if (hours < 0) {
+    return false;
+  }
+  return true;
+}
+
+
+void GOP::copyTo(GOP* dest) {
+  dest->tc_hours=getHour();
+  dest->tc_minutes=getMinutes();
+  dest->tc_seconds=getSeconds();
+  dest->drop_flag=getDropFlag();
+  dest->tc_pictures=getPictures();
+  dest->closed_gop=getClosedGOP();
+  dest->broken_link=getBrokenLink();
+
+  // currently do not copy ext/user data FIX ME
+}
+
+
+void GOP::print(const char* description) {
+  cout << "GOP [START]:"<<description<<endl;
+  cout << "tc_hours:"<<getHour()<<endl;
+  cout << "tc_minutes:"<<getMinutes()<<endl;
+  cout << "tc_seconds:"<<getSeconds()<<endl;
+  cout << "drop_flag:"<<getDropFlag()<<endl;
+  cout << "tc_pictures:"<<getPictures()<<endl;
+  cout << "closed_gop:"<<getClosedGOP()<<endl;
+  cout << "broken_link:"<<getBrokenLink()<<endl;
+  cout << "GOP [END]"<<endl;
+}