tskvideoinput.c

TI公司C6000系列DSP（DM642）模拟视频采集与回显源代码

/*
 *  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 <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 "evmdm642_vcapparams.h"
#include "evm642_mpeg2enc.h"

#include "appMain.h"
#include "appThreads.h"
#include "tskVideoInput.h"

ThrInput thrInput;


void tskVideoInputInit()
{
    
    int status;    

    /******************************************************/
    /* allocate capture  frame buffers                    */
    /* in external heap memory                            */
    /******************************************************/
     EVMDM642_vCapParamsChan.segId = extHeap ;//EXTERNALHEAP;
     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);


	
}

/*-----------------------------------------------------------*/
/*Start the capturing                                        */
/*-----------------------------------------------------------*/
void tskVideoInputStart() 
{
	FVID_control(capChan, VPORT_CMD_START, NULL);
}

/*-----------------------------------------------------------*/
/* handle video capture, scaling and re-format               */
/*-----------------------------------------------------------*/
void tskVideoInput()
{
   	char *ycbcrBuf[3];    
   
    SCOM_Handle fromInputtoProc,fromOuttoInput;
    fromInputtoProc = SCOM_open("INTOPROC");
    fromOuttoInput = SCOM_open("OUTTOIN");


	FVID_alloc(capChan, &capFrameBuf);

 	while(1)
 	{

 		ycbcrBuf[0] = capFrameBuf->frame.iFrm.y1;
 		ycbcrBuf[1] = capFrameBuf->frame.iFrm.cb1;
 		ycbcrBuf[2] = capFrameBuf->frame.iFrm.cr1;				
		
		yuvBufIp[0] = YUV_buffer_for_capture[capfrnum][0];
		yuvBufIp[1] = YUV_buffer_for_capture[capfrnum][1];	    
		yuvBufIp[2] = YUV_buffer_for_capture[capfrnum][2];    

 		/*-----------------------------------------------------------*/
		/* Call YUV422to420v to do chroma resampling                 */
 		/*-----------------------------------------------------------*/
		yuv422to420(ycbcrBuf,yuvBufIp,720,480);		 		

        capfrnum ++;        
        if(capfrnum > 3)
           capfrnum = 0;

       	/*-----------------------------------------------------------*/
  		/* Send message to process task with pointers to captured frame*/
   		/*-----------------------------------------------------------*/
        (thrInput.scomMsgTx).bufChannel = (void *)&yuvBufIp[0];
    	SCOM_putMsg(fromInputtoProc, &(thrInput.scomMsgTx));

       	/*-----------------------------------------------------------*/
       	/* Capture a new frame.                                      */
      	/*-----------------------------------------------------------*/
    	FVID_exchange(capChan, &capFrameBuf);

		/*-----------------------------------------------------------*/
   		/* Wait for the message from the process task                */
   		/*-----------------------------------------------------------*/
       	SCOM_getMsg(fromOuttoInput, SYS_FOREVER);
	}	    
}