1 files changed, 101 insertions, 0 deletions
diff --git a/mpeglib/lib/frame/frameQueue.cpp b/mpeglib/lib/frame/frameQueue.cpp
new file mode 100644
index 00000000..fe524976
--- /dev/null
+++ b/mpeglib/lib/frame/frameQueue.cpp
@@ -0,0 +1,101 @@
+/*
+  queues frames
+  Copyright (C) 2001  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 "frameQueue.h"
+
+#include <iostream>
+
+using namespace std;
+
+FrameQueue::FrameQueue(int maxsize) {
+  this->size=maxsize;
+  entries = new Frame*[size];
+  int i;
+  for(i=0;i<size;i++) {
+    entries[i]=NULL;
+  }
+  fillgrade=0;
+  writepos=0;
+  readpos=0;
+}
+
+
+FrameQueue::~FrameQueue() {
+  int i;
+  for(i=0;i<size;i++) {
+    if (entries[i] != NULL) {
+      delete entries[i];
+    }
+  }
+  delete entries;
+}
+
+int FrameQueue::canRead() {
+  return (fillgrade > 0);
+}
+
+
+int FrameQueue::canWrite() {
+  return (fillgrade < size);
+}
+
+
+int FrameQueue::getFillgrade() {
+  return fillgrade;
+}
+
+
+void FrameQueue::enqueue(Frame* frame) {
+  if(canWrite() == false) {
+    cout << "FrameQueue full cannot enqueue"<<endl;
+    exit(0);
+  }
+  fillgrade++;
+  entries[writepos]=frame;
+  writepos++;
+  if (writepos == size) {
+    writepos=0;
+  }
+}
+
+
+Frame* FrameQueue::dequeue() {
+  if(canRead() == false) {
+    cout << "FrameQueue empty cannot dequeue"<<endl;
+    exit(0);
+  }
+  Frame* back=entries[readpos];
+  // invalide this frame, we do not longer own it!
+  entries[readpos]=NULL;
+  fillgrade--;
+  readpos++;
+  if (readpos == size) {
+    readpos=0;
+  }
+  return back;
+}
+
+Frame* FrameQueue::peekqueue(int pos) {
+  if(fillgrade-pos <= 0) {
+    cout << "FrameQueue : cannot peek this positon"<<endl;
+    cout << "fillgrade:"<<fillgrade<<endl;
+    cout << "pos:"<<pos<<endl;
+    exit(0);
+  }
+  int getpos=(readpos+pos) % size;
+
+  
+  Frame* back=entries[getpos];
+  return back; 
+}
+