Initial community commit

Src/replicant/nsmp3dec/huffmantable.h

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+/***************************************************************************\
+ *
+*                    MPEG Layer3-Audio Decoder
+*                  <20> 1997-2006 by Fraunhofer IIS
+ *                        All Rights Reserved
+ *
+ *   filename: huffmantable.h
+ *   project : MPEG Decoder
+ *   author  : Martin Sieler
+ *   date    : 1998-01-05
+ *   contents/description: HEADER - huffman table object
+ *
+ *
+\***************************************************************************/
+
+/*
+ * $Date: 2011/01/18 23:00:53 $
+ * $Id: huffmantable.h,v 1.3 2011/01/18 23:00:53 audiodsp Exp $
+ */
+
+#ifndef __HUFFMANTABLE_H__
+#define __HUFFMANTABLE_H__
+
+/* ------------------------ includes --------------------------------------*/
+
+/*-------------------------- defines --------------------------------------*/
+
+#define HUFFMAN_BITS_4
+
+/*-------------------------------------------------------------------------*/
+
+// Huffman tables.
+//
+//  This object holds the huffman table for ISO/MPEG Layer-3.
+//
+  typedef struct
+    {
+	    const unsigned char length;
+			const unsigned char value;
+    } huffman_entry_t;
+
+class CHuffmanTable
+{
+public:
+  
+  /*unsigned int nTableIndex;	*/
+  CHuffmanTable();
+  virtual ~CHuffmanTable();
+
+  void SetTableIndex(unsigned int _nTableIndex)
+    { nTableIndex = _nTableIndex; }
+
+  unsigned int GetBitsPerLevel() const
+    { return BITS_PER_LEVEL; }
+
+  unsigned int GetLinBits() const
+    { return ht[nTableIndex].linbits; }
+
+  unsigned char GetCode  (unsigned int nIndex, unsigned int nValue) const
+    { return (ht[nTableIndex].table[nIndex][nValue] & 0xff); }
+
+  unsigned char GetLength(unsigned int nIndex, unsigned int nValue) const
+    {  return ((ht[nTableIndex].table[nIndex][nValue] >> 8) & 0xff); }
+
+  bool IsTableValid() const
+    {  return (ht[nTableIndex].table ? true:false); }
+
+  bool IsLengthZero(unsigned int nIndex, unsigned int nValue) const
+    { return ((ht[nTableIndex].table[nIndex][nValue] & 0xff00) == 0); }
+
+  enum 
+  { 
+#if defined HUFFMAN_BITS_2     /* HuffmanBits parallel huffman tables */
+    BITS_PER_LEVEL = 2, 
+    ENTRIES_PER_LEVEL = 4
+#elif defined HUFFMAN_BITS_3
+    BITS_PER_LEVEL = 3, 
+    ENTRIES_PER_LEVEL = 8
+#elif defined HUFFMAN_BITS_4   /* HuffmanBits parallel huffman tables */
+    BITS_PER_LEVEL = 4, 
+    ENTRIES_PER_LEVEL = 16 
+#endif
+	
+  };
+
+protected:
+
+private:
+
+  typedef struct
+    {
+    unsigned int linbits;
+    const unsigned short(*table)[ENTRIES_PER_LEVEL];
+    } huffmantab;
+
+  static const huffmantab ht[];
+
+  unsigned int nTableIndex;
+};
+
+/*-------------------------------------------------------------------------*/
+#endif