www.pudn.com > dm642video-driver.rar > video_scaling.c

/* 
 *  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  
#include    
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#include  
 
#include  
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#include  
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#include  
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#include      
 
#include  
 
#include "colorbar.h" 
#include "evmdm642_vcapparams.h" 
#include "evmdm642_vdisparams.h"    
 
 
#ifdef _NTSC_SRC 
#include "../settings/evmdm642_vdisparamsNTSC.c"   
#endif 
 
#ifdef _PAL_SRC 
#include "../settings/evmdm642_vdisparamsPAL.c" 
#endif 
 
 
/* 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;                  
    Int xOffset; 
    Int yOffset; 
 
    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; 
 
 
    /* since the default setting is for NTSC, we need to adjust */ 
    /* that if capture input is in PAL format                   */ 
    #ifdef _PAL 
    EVMDM642_vCapParamsSAA7115.inMode = SAA7115_MODE_PAL720; 
    #endif 
     
     
    if(EVMDM642_vCapParamsChan.fldOp == VPORT_FLDOP_FRAME) {     
        numLinesCap *= 2; /* account for both fields */ 
    }                          
    if(EVMDM642_vDisParamsChan.fldOp == VPORT_FLDOP_FRAME) {     
        numLinesDis *= 2; /* account for both fields */ 
    }                          
    numLines = (numLinesCap < numLinesDis) ? numLinesCap : numLinesDis; 
     
    xOffset = (disLinePitch - capLinePitch) >> 1; 
    yOffset = (numLinesDis - numLinesCap ) >> 1; 
    yOffset &= ~1; /* make sure it is even */ 
    if( xOffset < 0) { 
        xOffset = 0; 
    } 
    if( yOffset < 0) { 
        yOffset = 0; 
    } 
    /******************************************************/ 
    /* 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                   */ 
    /******************************************************/ 
    capChan = FVID_create("/VP0CAPTURE/A/0",  
            IOM_INPUT, &status, (Ptr)&EVMDM642_vCapParamsChan, NULL); 
 
 
    /******************************************************/ 
    /* 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); 
    FVID_control(capChan, VPORT_CMD_EDC_BASE + EDC_CONFIG,  
        (Ptr)&EVMDM642_vCapParamsSAA7115); 
 
 
    /******************************************************/ 
    /* start capture & display operation                  */     
    /******************************************************/ 
    FVID_control(disChan, VPORT_CMD_START, NULL); 
    FVID_control(capChan, VPORT_CMD_START, NULL); 
     
    /********************************************************/ 
    /* request a frame buffer from display & capture driver */ 
    /********************************************************/ 
    FVID_alloc(disChan, &disFrameBuf); 
    FVID_alloc(capChan, &capFrameBuf); 
 
    frames ++; 
 
 
    while(1){/* loop forever */ 
        Int i; 
        /* 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  
                     + xOffset + yOffset * disLinePitch, 
                     numPixels); 
            DAT_copy(capFrameBuf->frame.iFrm.cb1 + i * (capLinePitch >> 1),  
                     disFrameBuf->frame.iFrm.cb1 +  
                     (i + yOffset) * (disLinePitch >> 1) + (xOffset >> 1), 
                     numPixels>>1); 
 
            DAT_copy(capFrameBuf->frame.iFrm.cr1 + i * (capLinePitch >> 1),  
                     disFrameBuf->frame.iFrm.cr1 +  
                     (i + yOffset) * (disLinePitch >> 1) + (xOffset >> 1), 
                     numPixels>>1); 
        } 
        FVID_exchange(capChan, &capFrameBuf); 
        FVID_exchange(disChan, &disFrameBuf); 
         
        frames ++;               
   } 
}