DM642视频采集与回放 程序基本框架
void tskVideoLoopback()
{
//设置显示的行数
numLinesDis = EVMDM642_vDisParamsChan.imgVSizeFld1;
//设置采集的行数
numLinesCap = EVMDM642_vCapParamsChan.fldYStop1 –
EVMDM642_vCapParamsChan.fldYStrt1+1;
//取二者中较小的为程序处理的行数
numLines = (numLinesDis > numLinesCap) ? numLinesCap : numLinesDis;
#ifdef _LOOPBACK
//设置每行显示的像素
numPixels = EVMDM642_vCapParamsChan.fldXStop1 -
EVMDM642_vCapParamsChan.fldXStrt1+1;
//采集图像一行的总像素
capLinePitch = EVMDM642_vCapParamsChan.fldXStop1 -
EVMDM642_vCapParamsChan.fldXStrt1+1;
//显示图像一行的总像素
disLinePitch = EVMDM642_vDisParamsChan.imgHSizeFld1;
#endif
numLines *= 2; /* both fields */
//分配采集和显示图像的存放缓冲区
EVMDM642_vCapParamsChan.segId = EXTERNALHEAP;
EVMDM642_vDisParamsChan.segId = EXTERNALHEAP;
EVMDM642_vDisParamsSAA7104.hI2C = EVMDM642_I2C_hI2C;
EVMDM642_vCapParamsTVP5150A.hI2C = EVMDM642_I2C_hI2C;
//建立并初始化采集设备对象
#ifdef _LOOPBACK
#ifdef _VP2
capChan = FVID_create("/VP2CAPTURE/A/1",
IOM_INPUT, &status, (Ptr)&EVMDM642_vCapParamsChan, NULL);
#else
capChan = FVID_create("/VP0CAPTURE/A/0",
IOM_INPUT, &status, (Ptr)&EVMDM642_vCapParamsChan, NULL);
#endif
#endif
//建立并初始化显示设备对象
disChan = FVID_create("/VP1DISPLAY", IOM_OUTPUT,
&status, (Ptr)&EVMDM642_vDisParamsChan, NULL);
//为保证采集和显示设备正常工作，为其设置驱动
FVID_control(disChan, VPORT_CMD_EDC_BASE + EDC_CONFIG,
(Ptr)&EVMDM642_vDisParamsSAA7104);
#ifdef _LOOPBACK
FVID_control(capChan, VPORT_CMD_EDC_BASE + EDC_CONFIG,
(Ptr)&EVMDM642_vCapParamsTVP5150A);
#endif
//开始采集和显示操作
FVID_control(disChan, VPORT_CMD_START, NULL);
#ifdef _LOOPBACK
FVID_control(capChan, VPORT_CMD_START, NULL);
#endif
//分配采集和显示一帧图像存放的缓冲区
FVID_alloc(disChan, &disFrameBuf);
#ifdef _LOOPBACK
FVID_alloc(capChan, &capFrameBuf);
#endif
frames ++;
while(1)
{
#ifdef _LOOPBACK
Int i;
//将采集缓冲区的内容复制到显示缓冲区中
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);
}
FVID_exchange(capChan, &capFrameBuf);
#else //如果定义CAPTURE则填充图像缓冲为8条带
fillFrmBuf(&disFrameBuf->frame.iFrm,
EVMDM642_vDisParamsChan.imgHSizeFld1,
EVMDM642_vDisParamsChan.imgVSizeFld1+
EVMDM642_vDisParamsChan.imgVSizeFld2, frames % 360);
#endif
//将显示缓冲区中的一帧图像送给显示设备
FVID_exchange(disChan, &disFrameBuf);
//处理下一帧图像
frames ++;
}
}
产生向左平移的8条带图案：
#include <std.h>
#include <csl_cache.h>
#include <fvid.h>
#include <csl_dat.h>
#include "colorbar.h"
/* static function declaration 定义每个颜色的Y CB CR值 白黄青绿紫红蓝黑*/
static void generateColorBar(Uint8* y, Uint8* cb, Uint8* cr, Int lineSize);
#define WHITE_Y 180
#define WHITE_CB 128
#define WHITE_CR 128
#define YELLOW_Y 162
#define YELLOW_CB 44
#define YELLOW_CR 142
#define CYAN_Y 131
#define CYAN_CB 156
#define CYAN_CR 44
#define GREEN_Y 112
#define GREEN_CB 72
#define GREEN_CR 58
#define MAGENTA_Y 84
#define MAGENTA_CB 184
#define MAGENTA_CR 198
#define RED_Y 65
#define RED_CB 100
#define RED_CR 212
#define BLUE_Y 35
#define BLUE_CB 212
#define BLUE_CR 114
#define BLACK_Y 16
#define BLACK_CB 129
#define BLACK_CR 129
/* defines arrays to hold a line of image for color bar generating */
#pragma DATA_ALIGN(imgLineY, 8);
#pragma DATA_ALIGN(imgLineCb, 8);
#pragma DATA_ALIGN(imgLineCr, 8);
static Uint8 imgLineY[1920 * 3];
static Uint8 imgLineCb[960 * 3];
static Uint8 imgLineCr[960 * 3];
/*
* ======== fillFrmBuf ========
* This function fill a frame with color bar of Y/Cb/Cr format.
*/
void fillFrmBuf(FVID_IFrame* frame, Int lineSz, Int numLines, Int offset )
{
Int i;
static Int init = 0;
Int id;
if(!init) {
generateColorBar(imgLineY, imgLineCb, imgLineCr, lineSz);
CACHE_clean(CACHE_L2ALL, NULL, NULL);
init = 1;
}
for(i = 0; i < numLines; i ++) {
DAT_copy(imgLineY + offset * 2, frame->y1 + lineSz * i, lineSz);
DAT_copy(imgLineCb + offset, frame->cb1 + (lineSz >> 1) * i,
(lineSz >> 1));
id = DAT_copy(imgLineCr + offset, frame->cr1+(lineSz >> 1) * i,
(lineSz >> 1));
}
DAT_wait(id);
}
/*
* ======== generateColorBar ========
* This function generates a line of color bar with y/cb/cr format.
*/
static void generateColorBar(Uint8* y, Uint8* cb, Uint8* cr, Int lineSize)
{
Int i;
Int fillSize = lineSize >> 3;
Int k;
if(fillSize & 0x1) {
fillSize ++;
}
/* white bar */
for(k = 0; k < 3; k ++) {
for(i = 0; i<(fillSize >> 1); i++) {
y[2 * i] = WHITE_Y;
y[2 * i + 1] = WHITE_Y;
cb[i] = WHITE_CR;
cr[i] = WHITE_CB;
y[fillSize * 1 + 2 * i] = YELLOW_Y;
y[fillSize * 1 + 2 * i + 1] = YELLOW_Y;
cb[(fillSize >> 1) * 1 + i] = YELLOW_CB;
cr[(fillSize >> 1) * 1 + i] = YELLOW_CR;
y[fillSize * 2 + 2 * i] = CYAN_Y;
y[fillSize * 2 + 2 * i + 1] = CYAN_Y;
cb[(fillSize >> 1) * 2 + i] = CYAN_CB;
cr[(fillSize >> 1) * 2 + i] = CYAN_CR;
y[fillSize * 3 + 2 * i] = GREEN_Y;
y[fillSize * 3 + 2 * i + 1] = GREEN_Y;
cb[(fillSize >> 1) * 3 + i] = GREEN_CB;
cr[(fillSize >> 1) * 3 + i] = GREEN_CR;
y[fillSize * 4 + 2 * i] = MAGENTA_Y;
y[fillSize * 4 + 2 * i + 1] = MAGENTA_Y;
cb[(fillSize >> 1) * 4 + i] = MAGENTA_CB;
cr[(fillSize >> 1) * 4 + i] = MAGENTA_CR;
y[fillSize * 5 + 2 * i] = RED_Y;
y[fillSize * 5 + 2 * i + 1] = RED_Y;
cb[(fillSize >> 1) * 5 + i] = RED_CB;
cr[(fillSize >> 1) * 5 + i] = RED_CR;
y[fillSize * 6 + 2 * i] = BLUE_Y;
y[fillSize * 6 + 2 * i + 1] = BLUE_Y;
cb[(fillSize >> 1) * 6 + i] = BLUE_CB;
cr[(fillSize >> 1) * 6 + i] = BLUE_CR;
y[fillSize * 7 + 2 * i] = BLACK_Y;
y[fillSize * 7 + 2 * i + 1] = BLACK_Y;
cb[(fillSize >> 1) * 7 + i] = BLACK_CB;
cr[(fillSize >> 1) * 7 + i] = BLACK_CR;
}
y += lineSize;
cb += lineSize >> 1;
cr += lineSize >> 1;
}
}