上一篇说了下usb camera uvc标准的 顺便把CMOS做到一起 操作上基本一至 上一篇HAL层里我已经提供了CMOS的相关接口

JNIEXPORT jint JNICALL Java_com_dao_usbcam_Fimcgzsd_yuvtorgb

如果使用和UVC一样的处理 图像显示不出来 所以用另外一种方法 同时这里使用的是斯道ICOOL210开发板测试的 如果使用CMOS还需要修改一些地方 HAL层修改如下

首先增加一个函数如下

int select_input(int input)
{
	int ret;
	ret = ioctl(fd, VIDIOC_S_INPUT, &input);
	if (ret) {
		printf("xioctl VIDIOC_S_INPUT failed+++++\n");
	}   

	return ret;
}

JNIEXPORT jint JNICALL Java_com_dao_usbcam_Fimcgzsd_init(JNIEnv * env, jclass obj, jint width, jint height,jint numbuf,jint ctype)
{
	int ret;
	int i;
	bufnum = numbuf;
	mwidth = width;
	mheight = height;
	c_type = ctype;
	struct v4l2_format fmt;	
	struct v4l2_capability cap;

	if(c_type == 2)
		select_input(0);
	else if(c_type == 3)
		select_input(1);

    ret = ioctl(fd, VIDIOC_QUERYCAP, &cap);
    if (ret < 0) {
        LOGE("%d :VIDIOC_QUERYCAP failed\n",__LINE__);
        return -1;
    }
    if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
        LOGE("%d : no capture devices\n",__LINE__);
        return -1;
    }
				
	memset( &fmt, 0, sizeof(fmt));
	fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	if(c_type > 0)
		fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
	else
		fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_RGB565;
	if(c_type > 1) {
		fmt.fmt.pix.field = V4L2_FIELD_NONE;//V4L2_FIELD_INTERLACED;//V4L2_FIELD_NONE;
		fmt.fmt.pix.priv = 1;
	}
	fmt.fmt.pix.width = width;
	fmt.fmt.pix.height = height;					
	if (ioctl(fd, VIDIOC_S_FMT, &fmt) < 0)
	{
		LOGE("++++%d : set format failed\n",__LINE__);
		return -1;
	}

    struct v4l2_requestbuffers req;
    req.count = numbuf;
    req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    req.memory = V4L2_MEMORY_MMAP;

    ret = ioctl(fd, VIDIOC_REQBUFS, &req);
    if (ret < 0) {
        LOGE("++++%d : VIDIOC_REQBUFS failed\n",__LINE__);
        return -1;
    }

    buffers = calloc(req.count, sizeof(*buffers));
    if (!buffers) {
        LOGE ("++++%d Out of memory\n",__LINE__);
		return -1;
    }

	for(i = 0; i< bufnum; ++i) {
		memset(&v4l2_buf, 0, sizeof(v4l2_buf));
		v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
		v4l2_buf.memory = V4L2_MEMORY_MMAP;
		v4l2_buf.index = i;
		ret = ioctl(fd , VIDIOC_QUERYBUF, &v4l2_buf);
		if(ret < 0) {
		   LOGE("+++%d : VIDIOC_QUERYBUF failed\n",__LINE__);
		   return -1;
		}
		buffers[i].length = v4l2_buf.length;
		if ((buffers[i].start = (char *)mmap(0, v4l2_buf.length,
		                                     PROT_READ | PROT_WRITE, MAP_SHARED,
		                                     fd, v4l2_buf.m.offset)) < 0) {
		     LOGE("%d : mmap() failed",__LINE__);
		     return -1;
		}
	}
	rgb = (int *)malloc(sizeof(int) * (mwidth*mheight));
	ybuf = (int *)malloc(sizeof(int) * (mwidth*mheight));
	return 0;
}

同时在

void yuyv422torgb(unsigned char *src,int *mrgb)

最后需要修改下 在测试过程中发现红色和蓝色反了 所以把最后的

        *lrgb++ = 0xff000000 | b1<<16 | g1<<8 | r1;  
        *lrgb++ = 0xff000000 | b2<<16 | g2<<8 | r2;  

		*lrgb++ = 0xff000000 | r1<<16 | g1<<8 | b1;
		*lrgb++ = 0xff000000 | r2<<16 | g2<<8 | b2;

class StartThread extends Thread {

		@Override
		public void run() {
			// TODO Auto-generated method stub
			//super.run();
			while(true) {
				index = Fimcgzsd.dqbuf(mdata);
				if(index < 0) {
					onDestroy();
					break;
				}
				switch(ctype) {
					case 0:
						mHandler.post(mUpdateUI);
						bitmap = BitmapFactory.decodeByteArray(mdata, 0, width * height);
						Fimcgzsd.qbuf(index);
						break;
					case 1:
						Fimcgzsd.pixeltobmp(bmp);
						mHandler.post(mUpdateUI);
						bitmap = bmp;
						Fimcgzsd.qbuf(index);
						break;
					case 2: case 3:
	                    Fimcgzsd.yuvtorgb(mdata, rgb); 
	                    mHandler.post(mUpdateUI);
	                    bitmap = Bitmap.createBitmap(rgb,width,height,Bitmap.Config.ARGB_8888);
	                    Fimcgzsd.qbuf(index);
						break;
				}
			}
		}

CMOS效果如下