digest.h

一个两碟控制的VCD的代码,两碟之间的转动及连续播放,已大量生产的CODE.

/* Copyright 1996, ESS Technology, Inc.					*/
/* SCCSID @(#)digest.h	1.11 10/24/97 */

/*
 * $Log$
 */

#ifndef _DIGEST_H_
#define _DIGEST_H_

/************************************************************************
 * Header file
 ************************************************************************/
#include "common.h"

/************************************************************************
 John Lai's comment!

    ___            ____________________________________________
     |            |0,0                                        |
     |            |                                           |
     |            |                                           |
     |            |                                           | 
  yoffset         |                                           | 
    _|_ ___       |        _____________________________      | 
         |        |       |                             |     | 
       VGAP       |       |   Covered Picture Area      |     | 
        _|_ ___   |       |       ____________________  |     | 
             |    |       |      |....................| |     | 
             |    |       |      |...Active subDigest.| |     | 
             |    |       |      |.....Region.........| |     | 
        yoffsetEnd|       |      |....................| |     | 
             |    |       |      |....................| |     | 
            _|_   |       |      |____________________| |     | 
                  |       |                             |     | 
                  |       |_____________________________|     | 
                  |                                           | 
                  |___________________________________________| 
   
		  |xoffset|
		  
		          |<HGAP>|
			  	 |<---- xoffsetEnd---->|

 ************************************************************************/

/************************************************************************
 * Some local defines.
 ************************************************************************/
/* disk digest osd offset location in dram */
#define xoffsetU 		(xoffsetY>>1)
#define yoffsetU 		(yoffsetY>>1)

/* assume digest places 3x3 frames on screen */
#ifdef NEW_DGST_DISP
#define subDigestXSpacing33 	(30+6)
#define subDigestYSpacing33 	((DEST_HEIGHT>>1)+16)
#else
#define subDigestXSpacing33 	30
#define subDigestYSpacing33 	(DEST_HEIGHT>>1)
#endif

#define HGAP33 			(8>>2) /* must be multiple of 4 */
#define VGAP33			((vcx_VertSz>vcx_scn_height)?16:0) /*pal2ntsc*/

#define xoffsetEnd33_Y	 	(SOURCE_WIDTH/2-2*HGAP33)
#define yoffsetEnd33_Y \
	((vcx_VertSz>vcx_scn_height)?120:SOURCE_HEIGHT/2)

#ifdef NEW_DGST_DISP
#define xoffset33_Y(index) \
        (((vcx_scn_height==240)? 18:12) + \
	   ((index%3)*subDigestXSpacing33)) /* must be even */
#else
#define xoffset33_Y(index) \
        (((18 + (index%3)*subDigestXSpacing33))) /* must be even */
#endif	

#define yoffset33_Y_for_fillSubDigest(index) \
        (yoffsetGlobal33_Y_for_fillSubDigest+(index/3)*subDigestYSpacing33)
#define yoffset33_Y(index)    \
        (yoffsetGlobal33_Y+(index/3)*subDigestYSpacing33)

/* must have determined xoffsetY first */
#define offsetOsd_Y(yoffsetY, VGAP33)    ((yoffsetY)+(VGAP33))

/* assume digest places 2x2 frames on screen */
#define subDigestXSpacing22 	xoffsetEnd22_Y /* must be |4 */
#define HGAP22 			(16>>2) /* must be multiple of 4 */
#define VGAP22 \
	((vcx_VertSz>vcx_scn_height)?32:DEST_HEIGHT==240?0:16)

/* must be multiple of 2 macroblocks */
#define xoffsetEnd22_Y		(20*16/4) /* must be | 4 */
#define yoffsetEnd22_Y \
	((vcx_VertSz>vcx_scn_height)? DEST_HEIGHT-16: DEST_HEIGHT==240?SOURCE_HEIGHT-16: SOURCE_HEIGHT-32) /* 240-16 for ntsc2ntsc */

#define xoffsetGlobal22_Y 	(SOURCE_WIDTH-HGAP22-xoffsetEnd22_Y)
#define xoffset22_Y(index,HGAP22,xoffsetEnd22_Y) \
	((xoffsetGlobal22_Y+(index%2)*subDigestXSpacing22)*3/4+1) /* must be even, add 1 to make it so */
#define yoffsetGlobal22_Y 	(DEST_HEIGHT-VGAP22-yoffsetEnd22_Y)
#define yoffset22_Y(index,VGAP22,yoffsetEnd22_Y) \
	(yoffsetGlobal22_Y+(index/2)*yoffsetEnd22_Y)

#define OSD_3DIGITS(num, xoffset, yoffset) OSD_2DIGITS(num, xoffset, yoffset)

/************************************************************************
 * Global variables
 ************************************************************************/
GBLDEF_0(int digest_y_offset, 0);
GBLDEF_0(int digest_uv_offset, 0);
GBLDEF_0(int digestAudioStart, 0);

#ifdef CUST3_63
EXPORT digest_out_tmr;
EXPORT digest_start;
#endif /* CUST3_63 */

#ifdef CUST4
EXPORT void DGST_strobe9(void);
#endif /* CUST4 */

/************************************************************************
 * Global functions. 
 ************************************************************************/
void 	resetDigest(void);
void 	decideDigestVideoOrAudio(void);
int 	digestPage(int); 
int 	digestTrack(int);
void 	signalFinishSubDigest(int);
int 	checkSubDigestRange(int, int);
void 	setupSubDigestScreen(void);
int 	current_digest_track(void);
int	DGST_move_window(int, int);

#endif /* _DIGEST_H_ */