DSP编程

开发平台：
C/C++

video_hd.c：源码内容
							/*
 *  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.
 *  
 */
/* "@(#) DDK 1.10.00.21 06-26-03 (ddk-b10)" */
#include <std.h>
#include <tsk.h>  
#include <sem.h>   
#include <gio.h>
#include <csl_dat.h>
#include <csl_cache.h>
#include <fvid.h>
#include <edc.h>
#include <vport.h>
#include <vportcap.h>
#include <vportdis.h>
#include <saa7105.h>
#include <saa7115.h>    
#include <evmdm642.h>
#include "colorbar.h"
#include "evmdm642_vcapparams.h"
#include "evmdm642_vdisparams.h"   
/* heap IDs defined in the BIOS configuration file */
extern Int EXTERNALHEAP;
/*
 * ======== main ========
 */
main()
{
    /******************************************************/
    /* open CSL DAT module for fast copy                  */
    /******************************************************/
    CSL_init();                                             
    CACHE_clean(CACHE_L2ALL, 0, 0);
    CACHE_setL2Mode(CACHE_256KCACHE);       
    CACHE_enableCaching(CACHE_EMIFA_CE00);
    CACHE_enableCaching(CACHE_EMIFA_CE01);
    DAT_open(DAT_CHAANY, DAT_PRI_LOW, DAT_OPEN_2D);
}
/*
 * ======== tskVideoLoopback ========
 * video loopback function.
 */
void tskVideoLoopback()
{
    Int status;
    FVID_Handle disChan; 
    Int frames = 0;
    FVID_Frame *disFrameBuf;
    Int numLinesDis = EVMDM642_vDisParamsChan.imgVSizeFld1;
    Int numLinesCap = EVMDM642_vCapParamsChan.fldYStop1 -
       EVMDM642_vCapParamsChan.fldYStrt1+1;
    
    Int numLines = (numLinesDis > numLinesCap) ? numLinesCap : numLinesDis;
#ifdef _LOOPBACK
    Int i;
    FVID_Handle capChan; 
    Int numPixels = EVMDM642_vCapParamsChan.fldXStop1 - 
       EVMDM642_vCapParamsChan.fldXStrt1+1;
    FVID_Frame *capFrameBuf;
    Int capLinePitch = EVMDM642_vCapParamsChan.fldXStop1 - 
       EVMDM642_vCapParamsChan.fldXStrt1+1;
    Int disLinePitch = EVMDM642_vDisParamsChan.imgHSizeFld1;
#ifdef _PIP
    VPORTCAP_Params EVMDM642_vCapParamsChan2 = EVMDM642_vCapParamsChan;
    FVID_Handle capChan2; 
    FVID_Frame *capFrameBuf2;
    Int yPitch;
    Int cPitch;
    Int xOffset;
    Int yOffset = numLinesDis - numLines;
    Int numLines2;
    Int numPixels2;
#endif
#endif                
 
    numLines *= 2; /* both fields */
    /******************************************************/
    /* allocate both capture and display frame buffers    */
    /* in external heap memory                            */
    /******************************************************/
        EVMDM642_vCapParamsChan.segId = EXTERNALHEAP;
        EVMDM642_vDisParamsChan.segId = EXTERNALHEAP;
        EVMDM642_vDisParamsSAA7105.hI2C = EVMDM642_I2C_hI2C;
        EVMDM642_vCapParamsSAA7115.hI2C = EVMDM642_I2C_hI2C;
    /******************************************************/
    /* initialization of capture driver                   */
    /******************************************************/
#ifdef _LOOPBACK
    capChan = FVID_create("/VP0CAPTURE/A/0", 
            IOM_INPUT, &status, (Ptr)&EVMDM642_vCapParamsChan, NULL);
#ifdef _PIP
    if(EVMDM642_vDisParamsChan.fldOp == VPORT_FLDOP_FRAME) {
        yPitch = capLinePitch ;
        cPitch = capLinePitch >> 1;
        yOffset <<= 1;
        numLines2 = numLines;
        numPixels2 = numPixels;
     }else {
        EVMDM642_vCapParamsChan2.scale = VPORT_SCALING_ENABLE;
            EVMDM642_vCapParamsChan2.fldOp = VPORT_FLDOP_FLD1;        
            EVMDM642_vCapParamsChan2.thrld >>=1;
        yPitch = capLinePitch >> 1;
        cPitch = ((capLinePitch >> 2) + 7) & (~ 7);
        numLines2 = numLines >> 1;
        numPixels2 = numPixels >> 1;
    }
    xOffset = disLinePitch - yPitch;
    capChan2 = FVID_create("/VP1CAPTURE/A/1", 
            IOM_INPUT, &status, (Ptr)&EVMDM642_vCapParamsChan2, NULL);
#endif          
#endif          
    /******************************************************/
    /* initialization of display driver                   */
    /******************************************************/
    disChan = FVID_create("/VP2DISPLAY", IOM_OUTPUT, 
        &status, (Ptr)&EVMDM642_vDisParamsChan, NULL);
    
    /******************************************************/
    /* configure video encoder & decoder                  */
    /******************************************************/
    FVID_control(disChan, VPORT_CMD_EDC_BASE + EDC_CONFIG, 
        (Ptr)&EVMDM642_vDisParamsSAA7105);
#ifdef _LOOPBACK
    FVID_control(capChan, VPORT_CMD_EDC_BASE + EDC_CONFIG, 
        (Ptr)&EVMDM642_vCapParamsSAA7115);
#ifdef _PIP
    EVMDM642_vCapParamsSAA7115.aFmt = SAA7115_AFMT_COMPOSITE;
    FVID_control(capChan2, VPORT_CMD_EDC_BASE+EDC_CONFIG, 
        (Ptr)&EVMDM642_vCapParamsSAA7115);
#endif
#endif
    /******************************************************/
    /* start capture & display operation                  */    
    /******************************************************/
    FVID_control(disChan, VPORT_CMD_START, NULL);
#ifdef _LOOPBACK
    FVID_control(capChan, VPORT_CMD_START, NULL);
#ifdef _PIP
    FVID_control(capChan2, VPORT_CMD_START, NULL);
#endif    
#endif    
    
    /********************************************************/
    /* request a frame buffer from display & capture driver */
    /********************************************************/
    FVID_alloc(disChan, &disFrameBuf);
#ifdef _LOOPBACK
    FVID_alloc(capChan, &capFrameBuf);
#ifdef _PIP
    FVID_alloc(capChan2, &capFrameBuf2);
#endif      
#endif
    frames ++;
    while(1){/* loop forever */
#ifdef _LOOPBACK
        /* copy data from capture buffer to display buffer */
        /***************************************************/
        for(i = 0; i < numLines; i ++) {
            DAT_copy(capFrameBuf->frame.iFrm.y1 + i * capLinePitch, 
                     disFrameBuf->frame.iFrm.y1 + i * disLinePitch,
                     numPixels);
            DAT_copy(capFrameBuf->frame.iFrm.cb1 + i * (capLinePitch >> 1), 
                     disFrameBuf->frame.iFrm.cb1 + i * (disLinePitch >> 1),
                     numPixels>>1);
            DAT_copy(capFrameBuf->frame.iFrm.cr1 + i * (capLinePitch >> 1), 
                     disFrameBuf->frame.iFrm.cr1 + i * (disLinePitch >> 1),
                     numPixels>>1);
        }
#ifdef _PIP  
        for(i = 0; i < numLines2; i ++) {
            DAT_copy(capFrameBuf2->frame.iFrm.y1 + i * yPitch, 
                     disFrameBuf->frame.iFrm.y1 + (i + yOffset) * disLinePitch
                     + xOffset,
                     numPixels2);
                     
            DAT_copy(capFrameBuf2->frame.iFrm.cb1 + i * cPitch, 
                     disFrameBuf->frame.iFrm.cb1 + (i + yOffset) * (disLinePitch >> 1)
                     + (xOffset >> 1),
                     (numPixels2 >> 1));
            DAT_copy(capFrameBuf2->frame.iFrm.cr1 + i * cPitch, 
                     disFrameBuf->frame.iFrm.cr1 + (i + yOffset) * (disLinePitch >> 1)
                     +(xOffset >> 1),
                     (numPixels2 >> 1));
        }
#endif
        FVID_exchange(capChan, &capFrameBuf);
#ifdef _PIP
        FVID_exchange(capChan2, &capFrameBuf2);
#endif
#else
        fillFrmBuf(&disFrameBuf->frame.iFrm, EVMDM642_vDisParamsChan.imgHSizeFld1,
          EVMDM642_vDisParamsChan.imgVSizeFld1 
            + EVMDM642_vDisParamsChan.imgVSizeFld2,
          frames % 360);
#endif
        FVID_exchange(disChan, &disFrameBuf);
        
        frames ++;              
   }
}

						