C++ (Cpp) mxc_v4l_tvin_test Examples

Example #1

File: captureService.cpp Project: carl-feng/Main_bak

void* capture_thread(void* arg)
{
	void *shm = NULL;
	int shmid;
	shmid = shmget((key_t)123456, g_display_width*g_display_height*3, 0666|IPC_CREAT);
	if(shmid == -1)
	{
        fprintf(stderr, "shmget failed\n");
        return NULL;
    }
	//将共享内存连接到当前进程的地址空间
	shm = shmat(shmid, (void*)0, 0);
	if(shm == (void*)-1)
	{
        fprintf(stderr, "shmat failed\n");
        return NULL;
	}
	printf("Memory attached at %X\n", (int)shm);
	shared = (char*)shm;
    
    init();
	
	enum v4l2_buf_type type;

	if ((fd_capture_v4l = open(v4l_capture_dev, O_RDWR, 0)) < 0)
	{
		printf("Unable to open %s\n", v4l_capture_dev);
		return NULL;
	}

	if (v4l_capture_setup() < 0) {
		printf("Setup v4l capture failed.\n");
		return NULL;
	}

	mxc_v4l_tvin_test();

	type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	ioctl(fd_capture_v4l, VIDIOC_STREAMOFF, &type);
	
	int i;
	for (i = 0; i < g_capture_num_buffers; i++)
	{
		munmap(capture_buffers[i].start, capture_buffers[i].length);
	}

	close(fd_capture_v4l);
    if(shmdt(shm) == -1)
        fprintf(stderr, "shmdt failed\n");
    if(shmctl(shmid, IPC_RMID, 0) == -1)
    {
	    fprintf(stderr, "shmctl(IPC_RMID) failed\n");
    }
	return NULL;
}

Example #2

File: example2.c Project: rogeriorps/v4l2-examples

int main(int argc, char **argv)
{
	char fb_device[100] = "/dev/fb0";
	int fd_fb = 0, i;
	struct mxcfb_gbl_alpha alpha;
	enum v4l2_buf_type type;

	if ((fd_capture_v4l = open(v4l_capture_dev, O_RDWR, 0)) < 0)
	{
		printf("Unable to open %s\n", v4l_capture_dev);
		return TFAIL;
	}

	if ((fd_output_v4l = open(v4l_output_dev, O_RDWR, 0)) < 0)
	{
		printf("Unable to open %s\n", v4l_output_dev);
		return TFAIL;
	}

	if (v4l_capture_setup() < 0) {
		printf("Setup v4l capture failed.\n");
		return TFAIL;
	}

	if (v4l_output_setup() < 0) {
		printf("Setup v4l output failed.\n");
		close(fd_capture_v4l);
		return TFAIL;
	}

	if ((fd_fb = open(fb_device, O_RDWR )) < 0) {
		printf("Unable to open frame buffer\n");
		close(fd_capture_v4l);
		close(fd_output_v4l);
		return TFAIL;
	}

	/* Overlay setting */
	alpha.alpha = 0;
	alpha.enable = 1;
	if (ioctl(fd_fb, MXCFB_SET_GBL_ALPHA, &alpha) < 0) {
		printf("Set global alpha failed\n");
		close(fd_fb);
		close(fd_capture_v4l);
		close(fd_output_v4l);
		return TFAIL;
	}

	mxc_v4l_tvin_test();

	type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
	ioctl(fd_output_v4l, VIDIOC_STREAMOFF, &type);

	type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	ioctl(fd_capture_v4l, VIDIOC_STREAMOFF, &type);

	for (i = 0; i < g_output_num_buffers; i++)
	{
		munmap(output_buffers[i].start, output_buffers[i].length);
	}
	for (i = 0; i < g_capture_num_buffers; i++)
	{
		munmap(capture_buffers[i].start, capture_buffers[i].length);
	}

	close(fd_capture_v4l);
	close(fd_output_v4l);
	close(fd_fb);
	return 0;
}