1 files changed, 141 insertions, 0 deletions
diff --git a/mpeglib/lib/splay/mpegAudioBitWindow.h b/mpeglib/lib/splay/mpegAudioBitWindow.h
new file mode 100644
index 00000000..f7a2f64c
--- /dev/null
+++ b/mpeglib/lib/splay/mpegAudioBitWindow.h
@@ -0,0 +1,141 @@
+/*
+  bitwindow class
+  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
+
+ */
+
+
+#ifndef __MPEGBITWINDOW_H
+#define __MPEGBITWINDOW_H
+
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#ifndef WORDS_BIGENDIAN
+#define _KEY 0
+#else
+#define _KEY 3
+#endif
+
+
+
+#define WINDOWSIZE    4096
+#define BITWINDOWSIZE    (WINDOWSIZE*8)
+
+
+class MpegAudioBitWindow {
+
+  int  point,bitindex;
+  char buffer[2*WINDOWSIZE];
+
+ public:
+  MpegAudioBitWindow(){bitindex=point=0;}
+
+  inline void initialize(void)  {bitindex=point=0;}
+  inline int  gettotalbit(void) const {return bitindex;}
+
+  inline void putbyte(int c)    {buffer[point&(WINDOWSIZE-1)]=c;point++;}
+  void wrap(void);
+  inline void rewind(int bits)  {bitindex-=bits;}
+  inline void forward(int bits) {bitindex+=bits;}
+
+  // returns number of bits which can safley read
+  int  getCanReadBits();
+
+
+  //
+  // Ugly bitgetting inline functions for higher speed
+  //
+
+
+  inline int getbits(int bits) {
+    union
+    {
+      char store[4];
+      int current;
+    }u;
+    int bi;
+    
+    if(!bits)return 0;
+    
+    u.current=0;
+    bi=(bitindex&7);
+    u.store[_KEY]=buffer[(bitindex>>3)&(WINDOWSIZE-1)]<<bi;
+    //u.store[_KEY]=buffer[bitindex>>3]<<bi;
+    bi=8-bi;
+    bitindex+=bi;
+    
+    while(bits) {
+      if(!bi) {
+	u.store[_KEY]=buffer[(bitindex>>3)&(WINDOWSIZE-1)];
+	//u.store[_KEY]=buffer[bitindex>>3];
+	bitindex+=8;
+	bi=8;
+      }
+      
+      if(bits>=bi) {
+	u.current<<=bi;
+	bits-=bi;
+	bi=0;
+      }
+      else {
+	u.current<<=bits;
+	bi-=bits;
+	bits=0;
+      }
+    }
+    bitindex-=bi;
+    
+    return (u.current>>8);
+  }
+
+
+  int getbit(void) {
+    register int r=(buffer[(bitindex>>3)&(WINDOWSIZE-1)]>>(7-(bitindex&7)))&1;
+    //register int r=(buffer[bitindex>>3]>>(7-(bitindex&7)))&1;
+    bitindex++;
+    return r;
+  }
+
+  // no range check version
+  inline int getbits9_f(int bits) {
+    register unsigned short a;
+    {
+      int offset=bitindex>>3;
+      a=(((unsigned char)buffer[offset])<<8)|((unsigned char)buffer[offset+1]);
+    }
+    a<<=(bitindex&7);
+    bitindex+=bits;
+    return (int)((unsigned int)(a>>(16-bits)));
+  }    
+
+  // range check version
+  int getbits9(int bits) {
+    register unsigned short a;
+    {
+      int offset=(bitindex>>3)&(WINDOWSIZE-1);
+      a=(((unsigned char)buffer[offset])<<8)|((unsigned char)buffer[offset+1]);
+    }
+
+    a<<=(bitindex&7);
+    bitindex+=bits;
+    return (int)((unsigned int)(a>>(16-bits)));
+  }
+
+  int  peek8() {
+    int offset = (bitindex>>3)&(WINDOWSIZE-1), a;
+    a=(((unsigned char)buffer[offset])<<8) | ((unsigned char)buffer[offset+1]);
+    return (a >> (8-(bitindex&7))) & 0xff;
+  }  
+  
+
+};
+#endif