tskvideoinput.c

基于DM642的JPEG图象编解码的网络传输程序

#include <std.h>
#include <csl.h>
#include <csl_dat.h>
#include <csl_cache.h>
#include <chan.h>
#include <scom.h>
#include <utl.h>
#include <fvid.h>
#include <tsk.h>
#include "edc.h"

#include "vport.h"
#include "vportcap.h"
#include "evmdm642.h"
#include "saa7115.h"

#include "appMain.h"
#include "appBiosObjects.h"
#include "appThreads.h"

#include "evmdm642_vcapparams.h"
#include "cap_dis_size.h"

#pragma DATA_ALIGN( YArray, 128)
#pragma DATA_ALIGN( CbArray, 128)
#pragma DATA_ALIGN( CrArray, 128)
static unsigned char YArray[LINE_SZ*NUM_LINES*2];
static unsigned char CbArray[(LINE_SZ*NUM_LINES*2)>>1];
static unsigned char CrArray[(LINE_SZ*NUM_LINES*2)>>1];

/* heap IDs defined in the BIOS configuration file */
extern int extHeap;

FVID_Handle  capChan;
FVID_Frame *capFrameBuf;
void tskVideoInputInit()
{

    int             status;

    EVMDM642_vCapParamsChan.segId = extHeap;
    EVMDM642_vCapParamsSAA7115.hI2C = EVMDM642_I2C_hI2C;

    capChan = FVID_create("/VP0CAPTURE/A/0",
        IOM_INPUT, &status, (Ptr)&EVMDM642_vCapParamsChan, NULL);

    FVID_control(capChan, VPORT_CMD_EDC_BASE+EDC_CONFIG, (Ptr)&EVMDM642_vCapParamsSAA7115);
}

void tskVideoInputStart()
{
    FVID_control(capChan, VPORT_CMD_START, NULL);
}

/* handle video capture, scaling and re-format */
void tskVideoInput()
{
    int frame=0;
    char *outBuf[3];
    char *inBuf[3];
    ScomMessage scomMsg;
    SCOM_Handle hs_In2Enc,hs_Enc2In;

    hs_In2Enc  = SCOM_open("IN2ENC");
    hs_Enc2In  = SCOM_open("ENC2IN");

    if( !hs_In2Enc || !hs_Enc2In )
    {
        for(;;);
    }

    FVID_alloc(capChan, &capFrameBuf);

    while(1)
    {
        frame++;

        UTL_stsStart( stsCapTime );

        inBuf[0]  = capFrameBuf->frame.iFrm.y1;
        inBuf[1]  = capFrameBuf->frame.iFrm.cb1;
        inBuf[2]  = capFrameBuf->frame.iFrm.cr1;

        outBuf[0] =  (char *)YArray;
        outBuf[1] =  (char *)CbArray;
        outBuf[2] =  (char *)CrArray;

        yuv422to420(inBuf,outBuf, 720, 480);

        UTL_stsStop( stsCapTime );

        // Pass the frame to the input task
        scomMsg.bufY = YArray;
        scomMsg.bufU = CbArray;
        scomMsg.bufV = CrArray;
        SCOM_putMsg( hs_In2Enc, &scomMsg );

        // Calculate how long it takes to capture one frame
        UTL_stsPeriod( stsCycleTime );

        // Get back ownership of our linear buffer
        SCOM_getMsg( hs_Enc2In, SYS_FOREVER );

        // Get a new frame from the capture driver
        FVID_exchange(capChan, &capFrameBuf);
    }
}