basic_op.h

AMR-NB 的编码实现,纯C, VC下建立工程即可用.

#ifndef BASIO_OP_H
#define  BASIO_OP_H



#define MAX_32 (Word32)0x7fffffffL
#define MIN_32 (Word32)0x80000000L

#define MAX_16 (Word16)0x7fff
#define MIN_16 (Word16)0x8000


Word16 norm_s (Word16 var1);                    
Word16 div_s (Word16 var1, Word16 var2);     
Word16 norm_l (Word32 L_var1);                   
Word16 shr_r (Word16 var1, Word16 var2);     
Word32 L_shr_r (Word32 L_var1, Word16 var2); 
Word32 Div_32 (Word32 L_num, Word16 denom_hi, Word16 denom_lo);

 
Word32 Inv_sqrt ( Word32 L_x    );
void Log2 (Word32 L_x, Word16 *exponent,  Word16 *fraction  );
void Log2_norm ( Word32 L_x,   Word16 exp, Word16 *exponent, Word16 *fraction );
Word32 Pow2 ( Word16 exponent,  Word16 fraction   );
Word32 sqrt_l_exp (Word32 L_x, Word16 *exp  );


#endif