convert.c

本程序基于瑞泰公司的ICETEK-DM642-EDUlabv1.2开发板

/*
 *  Copyright 2003 by Texas Instruments Incorporated.
 *  All rights reserved. Property of Texas Instruments Incorporated.
 *  Restricted rights to use, duplicate or disclose this code are
 *  granted through contract.
 *  
 */
#include <csl.h>
#include <csl_dat.h>
#include <csl_cache.h>
#include "mpeg2dma.h"

#define min(x,y) ((x)<(y))?(x):(y)

/* Input for this func will 4:2:2 data. This function
 * will convert the data to 4:2:0 and will also reformat
 * the data to be contiguous at MB level.
 */

void yuv422to420( char *frameIn[], char *frm_out[], 
                  int width, int height)
{
    char *pSrcY = frameIn[0];
	char *pSrcU = frameIn[1];
	char *pSrcV = frameIn[2];

    char *pDestY = frm_out[0];
	char *pDestU = frm_out[1];
	char *pDestV = frm_out[2];

    unsigned int qdma_countY, qdma_idxY, qdma_optY;
    unsigned int qdma_countU, qdma_idxU, qdma_optU;
    unsigned int qdma_countV, qdma_idxV, qdma_optV;
   
 	int rowindex;
 	int ch_width  = width>>1;
 	int ch_height = height >>1;

    /* ------------------------------------------------------------------- */
    /* Luma Transfer                                                       */
    /* ------------------------------------------------------------------- */
    qdma_countY	    = 	EDMA_MK_CNT(width>>2,0); 	
    qdma_idxY 	    =   EDMA_MK_IDX(0, 0);
    qdma_optY 	    = 	EDMA_MK_OPT(EDMA_OPT_FS_NO,
              		          EDMA_OPT_LINK_NO,
                              EDMA_OPT_TCC_OF(CHANNEL12), 	
                              EDMA_OPT_TCINT_YES,
                              EDMA_OPT_DUM_INC,
                              EDMA_OPT_2DD_NO,			
                              EDMA_OPT_SUM_INC,
                              EDMA_OPT_2DS_NO,			
                              EDMA_OPT_ESIZE_32BIT,
                              EDMA_OPT_PRI_LOW)  | TCCM(CHANNEL12);			
                                  
    qdma_countU     = 	EDMA_MK_CNT(ch_width>>2,0); 	
    qdma_idxU 	    =   EDMA_MK_IDX(0, 0);
    qdma_optU 	    = 	EDMA_MK_OPT(EDMA_OPT_FS_NO,
              		          EDMA_OPT_LINK_NO,
                              EDMA_OPT_TCC_OF(CHANNEL13), 	
                              EDMA_OPT_TCINT_YES,
                              EDMA_OPT_DUM_INC,
                              EDMA_OPT_2DD_NO,			
                              EDMA_OPT_SUM_INC,
                              EDMA_OPT_2DS_NO,			
                              EDMA_OPT_ESIZE_32BIT,
                              EDMA_OPT_PRI_LOW)  | TCCM(CHANNEL13);			

    qdma_countV     = 	EDMA_MK_CNT(ch_width>>2,0); 	
    qdma_idxV 	    =   EDMA_MK_IDX(0, 0);
    qdma_optV 	    = 	EDMA_MK_OPT(EDMA_OPT_FS_NO,
              		          EDMA_OPT_LINK_NO,
                              EDMA_OPT_TCC_OF(CHANNEL14), 	
                              EDMA_OPT_TCINT_YES,
                              EDMA_OPT_DUM_INC,
                              EDMA_OPT_2DD_NO,			
                              EDMA_OPT_SUM_INC,
                              EDMA_OPT_2DS_NO,			
                              EDMA_OPT_ESIZE_32BIT,
                              EDMA_OPT_PRI_LOW)  | TCCM(CHANNEL14);			
                              
	for( rowindex = 0; rowindex < ch_height;rowindex++)
	{	    
	    QDMA_START(qdma_optY, pSrcY, qdma_countY, pDestY, qdma_idxY);
	    pSrcY  += width;
	    pDestY += width;
	    
	    QDMA_START(qdma_optY, pSrcY, qdma_countY, pDestY, qdma_idxY);
	    pSrcY  += width;
	    pDestY += width;
	    
	    QDMA_START(qdma_optU, pSrcU, qdma_countU, pDestU, qdma_idxU);
	    QDMA_START(qdma_optV, pSrcV, qdma_countV, pDestV, qdma_idxV);
	    
	    pDestU += ch_width;
	    pDestV += ch_width;
	    pSrcU  += 2*ch_width;
	    pSrcV  += 2*ch_width;
	    
	    QDMA_WAIT_HIGH(CHANNEL13);
	    QDMA_WAIT_HIGH(CHANNEL14);
	}

   QDMA_WAIT_HIGH(CHANNEL12);
   return ;
}