bw.h

视频601芯片的驱动源码,你可以完全掌控该芯片了,对于其它多媒体芯片的设计具有参考价值

/*------------------------------------------------------------------------

$Workfile: BW.H $
$Date: 12/10/96 6:17p $
$Revision: 6 $
* Purpose:	
*			Header for Bin Width Calculator.			
* Notes:       
*
$History: BW.H $
 * 
 * *****************  Version 6  *****************
 * User: Az           Date: 12/10/96   Time: 6:17p
 * Updated in $/601cman
 * Added isrnum to BWCinput (for debugging).
 * 
 * *****************  Version 5  *****************
 * User: Az           Date: 12/10/96   Time: 4:03p
 * Updated in $/601cman
 * Added special_effects_p field in BWCinit structure.
 * 
 * *****************  Version 4  *****************
 * User: Az           Date: 12/10/96   Time: 1:16p
 * Updated in $/601cman
 * Change interface to accomodate Scene Detection function.
 * 
 * *****************  Version 3  *****************
 * User: Stevel       Date: 10/03/96   Time: 2:18p
 * Updated in $/601cman
 * Merge with ICM project.
 * 
 * *****************  Version 2  *****************
 * User: Stevel       Date: 3/11/96    Time: 12:50p
 * Updated in $/601cman
 * Add  DLLEXPORT keyword to export functions for diagnostic test
 * 
 * *****************  Version 1  *****************
 * User: Stevel       Date: 3/06/96    Time: 7:54p
 * Created in $/601cman
 * Initial release

  
    This code and information is provided "as is" without warranty of any
    kind, either expressed or implied, including but not limited to the
    implied warranties of merchantability and/or fitness for a particular
    purpose.
  
    1996 Analog Devices, Inc. 
  
-------------------------------------------------------------------------*/
#ifndef BW_H
#define BW_H

// Need to define SOFTCODEC To build ICM (ADV601.DLL)
#ifdef	SOFTCODEC
#define DLLEXPORT 
#else
#define DLLEXPORT __declspec(dllexport)
#endif

#ifndef real
#define real float
#endif

#ifndef NBLOCKS
#define NBLOCKS 42
#endif

typedef  enum {GENERAL, NATURAL, SYNTHETIC} IMAGE_TYPE;

/* Currently (7/18/96) only SumOfSq is used. 
   The rest are for future upgrades */

typedef struct {
    unsigned short SumOfSq[NBLOCKS];
    real  AlphaGain[NBLOCKS];
    real  BetaGain[NBLOCKS];
    short SumValue[NBLOCKS];
    short MaxValue[3];
    short MinValue[3];
    real  OldBp;
    int isrnum;
} BWCinput;

/* FieldDecim is not currently (7/18/96) used */

typedef struct {
    unsigned short BWCoeff  [NBLOCKS]; /* Bin Widths */
    unsigned short RBWCoeff [NBLOCKS]; /* Reciprocals of BWCoeff */
    unsigned short FieldDecim;
    int scene_change_p; /* boolean */
} BWCoutput;

/* The BWCinit structure is filled for each compression session */

typedef struct {
  unsigned short ImageWidth;
  unsigned short ImageHeight;
  real Bpp;       		/* Bits Per Pixel: required bit rate */
  IMAGE_TYPE ImgType;
  int scene_detection_p;  /* boolean */
  int special_effects_p; /* True if special effects are used. */
                        /* In this case the FEEDBACK MUST BE DISABLED */
} BWCinit;

typedef struct {
    real BppFeedbackParm[2];  /* Not currently in use (7/18/96) */
    real BppPrecision; /* Relative Precision for Bpp Estimation */
    real MinBW[NBLOCKS];  /* Minimal Bin Widths, not used */
    real MaxBW[NBLOCKS];  /* Maximum Bin Widths, not used */
    void *PMModel; /* not used */
    real FDecimThresh[12]; /* not used */
    real MaxQVal2Inv;  /* inverse of max. square of quantized value */
} BWCconfig;

///////////////////////////////////////////////////////////////////////////
// Exported Bin Width Calculator function prototypes
///////////////////////////////////////////////////////////////////////////
DLLEXPORT extern void bw_init (BWCinit *);
DLLEXPORT extern void bw_config ();
DLLEXPORT extern void bw_compute (BWCinput*, BWCoutput*);

#endif /*BW_H*/