d_gain_p.h

这是一个平台无关的标准C的AMR解码库

/*
********************************************************************************
*
*      GSM AMR-NB speech codec   R98   Version 7.6.0   December 12, 2001
*                                R99   Version 3.3.0                
*                                REL-4 Version 4.1.0                
*
********************************************************************************
*
*      File             : d_gain_p.h
*      Purpose          : Decodes the pitch gain using the received index.
*
********************************************************************************
*/
#ifndef d_gain_p_h
#define d_gain_p_h "$Id $"
 
/*
********************************************************************************
*                         INCLUDE FILES
********************************************************************************
*/
#include "typedef.h"
#include "mode.h"
 
/*
**************************************************************************
*
*  Function    : d_gain_pitch
*  Purpose     : Decodes the pitch gain using the received index.
*  Description : In case of no frame erasure, the gain is obtained 
*                from the quantization table at the given index; 
*                otherwise, a downscaled past gain is used.
*  Returns     : Quantized pitch gain
*
**************************************************************************
*/
Word16 d_gain_pitch (      /* return value: gain (Q14)                */
    enum Mode mode,        /* i : AMR mode                            */
    Word16 index           /* i   : index of quantization             */
);
 
#endif