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/************************************************************************** 
 
This software module was originally developed by 
 
Mikko Suonio (Nokia) 
 
in the course of development of the MPEG-2 NBC/MPEG-4 Audio standard 
ISO/IEC 13818-7, 14496-1,2 and 3. This software module is an 
implementation of a part of one or more MPEG-2 NBC/MPEG-4 Audio tools 
as specified by the MPEG-2 NBC/MPEG-4 Audio standard. ISO/IEC gives 
users of the MPEG-2 NBC/MPEG-4 Audio standards free license to this 
software module or modifications thereof for use in hardware or 
software products claiming conformance to the MPEG-2 NBC/ MPEG-4 Audio 
standards. Those intending to use this software module in hardware or 
software products are advised that this use may infringe existing 
patents. The original developer of this software module and his/her 
company, the subsequent editors and their companies, and ISO/IEC have 
no liability for use of this software module or modifications thereof 
in an implementation. Copyright is not released for non MPEG-2 
NBC/MPEG-4 Audio conforming products. The original developer retains 
full right to use the code for his/her own purpose, assign or donate 
the code to a third party and to inhibit third party from using the 
code for non MPEG-2 NBC/MPEG-4 Audio conforming products. This 
copyright notice must be included in all copies or derivative works. 
 
Copyright (c) 1997. 
 
***************************************************************************/ 
 
#ifndef _NOK_LTP_COMMON_H 
#define _NOK_LTP_COMMON_H 
 
/* 
  Macro:	MAX_SHORT_WINDOWS 
  Purpose:	Number of short windows in one long window. 
  Explanation:	-  */ 
#ifndef MAX_SHORT_WINDOWS 
#define MAX_SHORT_WINDOWS NSHORT 
#endif 
 
/* 
  Macro:	MAX_SCFAC_BANDS 
  Purpose:	Maximum number of scalefactor bands in one frame. 
  Explanation:	-  */ 
#ifndef MAX_SCFAC_BANDS 
#define MAX_SCFAC_BANDS MAXBANDS 
#endif 
 
/* 
  Macro:	BLOCK_LEN_LONG 
  Purpose:	Length of one long window 
  Explanation:	-  */ 
#ifndef BLOCK_LEN_LONG 
#define BLOCK_LEN_LONG LN2 
#endif 
 
 
/* 
  Macro:	NOK_MAX_BLOCK_LEN_LONG 
  Purpose:	Informs the routine of the maximum block size used. 
  Explanation:	This is needed since the TwinVQ long window 
  		is different from the AAC long window.  */ 
#define	NOK_MAX_BLOCK_LEN_LONG BLOCK_LEN_LONG //(2 * BLOCK_LEN_LONG)  
 
/* 
  Macro:	NOK_LT_BLEN 
  Purpose:	Length of the history buffer. 
  Explanation:	Has to hold two long windows of time domain data.  */ 
#ifndef	NOK_LT_BLEN 
#define NOK_LT_BLEN (4 * NOK_MAX_BLOCK_LEN_LONG) 
#endif 
 
/* 
  Type:		NOK_LT_PRED_STATUS 
  Purpose:	Type of the struct holding the LTP encoding parameters. 
  Explanation:	-  */ 
typedef struct 
  { 
    short buffer[NOK_LT_BLEN]; 
    Float weight; 
    int sbk_prediction_used[MAX_SHORT_WINDOWS]; 
    int sfb_prediction_used[MAX_SCFAC_BANDS]; 
    int *delay; 
  } 
NOK_LT_PRED_STATUS; 
 
 
#endif /* _NOK_LTP_COMMON_H */