S5PV210 Android camera驱动测试程序

最近在调试S5PV210上的camera驱动，因为对Android的samsung camera hal 不太了解，自己写了个测试程序方便调试。

因为camera驱动都是遵守V4L2标准，所以测试程序是通用的，在MX51平台也能工作。

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <getopt.h>  
#include <fcntl.h>  
#include <unistd.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <asm/types.h>
#include <linux/videodev2.h>
#include <linux/fb.h>

#define CLEAR(x) memset (&(x), 0, sizeof (x))

int PAL_WIDTH = 720;
int PAL_HEIGHT = 576;

enum {
	RGB565,
	RGB888,
	RGB32,
};

struct buffer {
	void *start;
	size_t length;
};

static char *dev_name = NULL;
static int fd = -1;
static unsigned int n_buffers = 0;
static int g_width;
static int g_height;
static unsigned  g_pixelformat;
static struct fb_var_screeninfo vinfo;
static struct fb_fix_screeninfo finfo;
struct buffer *buffers = NULL;
static int file_index = 1;
static int g_count = 9;

 
static void errno_exit (const char * s)
{
    fprintf (stderr, "%s error %d, %s\n",s, errno, strerror (errno));
    exit (EXIT_FAILURE);
}
 
static int xioctl (int fd,int request,void * arg)
{
    int r;
    do r = ioctl (fd, request, arg);
    while (-1 == r && EINTR == errno);
    return r;
}
 
static void write_yuv(const void *p, int index)
{
	int write_fd = 0;
	int ret;
	int length;
	char tmp[20];

	sprintf(tmp, "/data/file/yuvfile%d", index);

	write_fd = open(tmp, O_RDWR|O_CREAT);
	if (write_fd == -1) {
		printf("%s: open yuvfile failed, errno(%d)\n", __func__, errno);
	}

	length = g_width * g_height * 2;
	ret = write(write_fd, p, length);
	if (ret != length) {
		printf("%s: write yuvfile failed, ret(%d), errno(%d)\n", __func__, ret, errno);
	}
}

static void process_image(const void *p)
{
	if (file_index < g_count) {
		write_yuv(p, file_index);
		file_index = file_index + 1;
	}
}

static int read_frame(void)
{
	int ret = 0;
	struct timeval timer;
	struct v4l2_buffer buf;

	CLEAR (buf);
	buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	buf.memory = V4L2_MEMORY_MMAP;

	if (-1 == xioctl(fd, VIDIOC_DQBUF, &buf)) {
		switch (errno) {
		case EAGAIN:
			printf("VIDIOC_DQBUF return EAGAIN\n");
			return 0;
		default:
			printf("VIDIOC_DQBUF failed, errno(%d):\n", errno, strerror(errno));
			ret = -errno;
			return ret;
		}
	}

	assert (buf.index < n_buffers);
	printf("%s: buf.bytesused(%d), buf.index(%d)\n", 
			__func__, buf.index);
	process_image(buffers[buf.index].start);
    if (-1 == xioctl(fd, VIDIOC_QBUF, &buf)) {
		printf("VIDIOC_BUF failed, errno(%d)\n", errno);
		ret = -errno;
	}

	gettimeofday(&timer, NULL);
	printf("(%d)th capture, tv_sec(%d), tv_usec\n", 
			file_index, timer.tv_sec, timer.tv_usec);

    return ret;
}
 
static void run(void)
{
	int ret;

	printf("%s: enter\n", __func__);

	while (1) {
		fd_set fds;
		struct timeval tv;
		FD_ZERO (&fds);
		FD_SET(fd, &fds);
		
		if (file_index == g_count) {
			break;
		}

		tv.tv_sec = 5;
		tv.tv_usec = 0;

		ret = select(fd + 1, &fds, NULL, NULL, &tv);
		if (-1 == ret) {
			if (EINTR == errno) {
				printf("errno == EINTR\n");
				continue;
			}
			errno_exit("select");
		}

		if (0 == ret) {
			printf("select timeout\n");
			exit(EXIT_FAILURE);
		}

		if (read_frame())
			continue;
		sleep(1);
	}

	printf("%s: end run\n", __func__);
}

static void stop_capturing (void)
{
	enum v4l2_buf_type type;

	printf("%s: enter\n", __func__);

	type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	if (-1 == xioctl (fd, VIDIOC_STREAMOFF, &type))
		errno_exit ("VIDIOC_STREAMOFF");
}
 
static void start_capturing(void)
{
    unsigned int i;
    enum v4l2_buf_type type;

	printf("%s: enter\n", __func__);
 
	for (i = 0; i < n_buffers; ++i) {
		struct v4l2_buffer buf;
		CLEAR (buf);

		buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
		buf.memory = V4L2_MEMORY_MMAP;
		buf.index = i;

		if (-1 == xioctl (fd, VIDIOC_QBUF, &buf))
			errno_exit ("VIDIOC_QBUF");
	}

	type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

	if (-1 == xioctl (fd, VIDIOC_STREAMON, &type))
		errno_exit ("VIDIOC_STREAMON");

}

static void uninit_device (void)
{
    unsigned int i;
 
    for (i = 0; i < n_buffers; ++i)
        if (-1 == munmap(buffers[i].start, buffers[i].length))
            errno_exit ("munmap");
    
	free (buffers);
}


static void init_mmap (void)
{
    struct v4l2_requestbuffers req;

    CLEAR (req); 
    req.count = 4;
    req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    req.memory = V4L2_MEMORY_MMAP;
    if (-1 == xioctl (fd, VIDIOC_REQBUFS, &req)) {
        if (EINVAL == errno) {
            fprintf (stderr, "%s does not support memory mapping\n", dev_name);
            exit (EXIT_FAILURE);
        } else {
            errno_exit ("VIDIOC_REQBUFS");
        }
    }
 
    if (req.count < 2) {    //if (req.count < 2)
        fprintf (stderr, "Insufficient buffer memory on %s\n",dev_name);
        exit (EXIT_FAILURE);
    }
 
    buffers = calloc(req.count, sizeof(*buffers));
    if (!buffers) {
        fprintf (stderr, "Out of memory\n");
        exit (EXIT_FAILURE);
    }
	printf("request buffer count(%d)\n", req.count);
 
    for (n_buffers = 0; n_buffers < req.count; ++n_buffers) {
        struct v4l2_buffer buf;
 
        CLEAR (buf);
 
        buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
        buf.memory = V4L2_MEMORY_MMAP;
        buf.index = n_buffers;
 
        if (-1 == xioctl (fd, VIDIOC_QUERYBUF, &buf))
            errno_exit ("VIDIOC_QUERYBUF");
 
        buffers[n_buffers].length = buf.length;
        buffers[n_buffers].start = mmap(NULL, buf.length, PROT_READ|PROT_WRITE, MAP_SHARED, fd, buf.m.offset);
 		printf("buf.start(%p), buf.length(%d)\n", buffers[n_buffers].start, buf.length);
        if (MAP_FAILED == buffers[n_buffers].start)
            errno_exit ("mmap");
    }
 
}

static void init_device (void)
{
    struct v4l2_capability cap;
    struct v4l2_cropcap cropcap;
    struct v4l2_crop crop;
    struct v4l2_format fmt;

	if (-1 == xioctl(fd, VIDIOC_QUERYCAP, &cap)) {
		printf("%s: VIDIOC_QUERYCAP\n", __func__, errno);
		exit (EXIT_FAILURE);
	}

	printf("support overlay cap.capabilities(0x%x)\n", cap.capabilities);
    if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
        fprintf (stderr, "%s is no video capture device\n",dev_name);
        exit (EXIT_FAILURE);
    }
 
    if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
        fprintf (stderr, "%s does not support streaming i/o\n",dev_name);
        exit (EXIT_FAILURE);
    }
 
    CLEAR (cropcap); 
    cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	if (0 == xioctl (fd, VIDIOC_CROPCAP, &cropcap)) {
		crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
		crop.c = cropcap.defrect;

		if (-1 == xioctl(fd, VIDIOC_S_CROP, &crop)) {
			printf("VIDIOC_S_CROP failed(%d), %s\n", errno, strerror(errno));
		}
	}

	CLEAR (fmt);
	fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	fmt.fmt.pix.width = PAL_WIDTH;
        fmt.fmt.pix.height = PAL_HEIGHT;
        fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
        fmt.fmt.pix.field = V4L2_FIELD_NONE;
        if (-1 == xioctl (fd, VIDIOC_S_FMT, &fmt)) {
        errno_exit ("VIDIOC_S_FMT");
	}

	printf("width(%d), height(%d), pixelformat(0x%x), field(%d)\n", 
			fmt.fmt.pix.width, fmt.fmt.pix.height, fmt.fmt.pix.pixelformat, 
			fmt.fmt.pix.field);

	g_width = fmt.fmt.pix.width;
	g_height = fmt.fmt.pix.height;

        init_mmap ();
}
 
static void close_device(void)
{
	close(fd);
}

static void open_device(void)
{
	struct stat st;  


	fd = open(dev_name, O_RDWR| O_NONBLOCK, 0);
	if (-1 == fd) {
		fprintf (stderr, "Cannot open '%s': %d, %s\n", 
				dev_name, errno, strerror (errno));
		exit (EXIT_FAILURE);
	}
}

static void usage (FILE * fp,int argc,char ** argv)
{
	fprintf (fp,
			"Usage: %s [options]\n\n"
			"Options:\n"
			"-d | --device name Video device name [/dev/video]\n"
			"-h | --help Print this message\n"
			"-t | --how long will display in seconds\n"
			"",
			argv[0]);
}

static const char short_options [] = "d:w:h:f:p:c:";
static const struct option long_options [] = {
	{ "device", required_argument, NULL, 'd' },
	{ "help", no_argument, NULL, 'h' },
	{ "time", no_argument, NULL, 't' },
	{ 0, 0, 0, 0 }
};

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

	return ret;
}   


int main (int argc,char ** argv)
{
	dev_name = "/dev/video0";

	for (;;) {
		int index;
		int c;
		int tmp;

		c = getopt_long(argc, argv, short_options, long_options, &index);
		if (-1 == c)
			break;

		switch (c) {
			case 0:
				break;
			case 'd':
				dev_name = optarg;
				break;
			case 'c':
				g_count = strtol(optarg, NULL, 10);
				break;
			case 'p':
				tmp = strtol(optarg, NULL, 10);
				if (tmp == 0) {
					g_pixelformat = V4L2_PIX_FMT_UYVY;
				}
				else if (tmp == 1) {
					g_pixelformat = V4L2_PIX_FMT_YUYV;
				}
				break;
			case 'w':
				PAL_WIDTH = strtol(optarg, NULL, 10);
				printf("PAL_WIDTH(%d)\n", PAL_WIDTH);
				break;
			case 'h':
				PAL_HEIGHT = strtol(optarg, NULL, 10);
				printf("PAL_HEIGHT(%d)\n", PAL_HEIGHT);
				break;
			default:
				usage (stderr, argc, argv);
				exit (EXIT_FAILURE);
		}
	}

	open_device();
	select_input(0);
	init_device();
	start_capturing ();
	run();
	stop_capturing();
        uninit_device();
	close_device();

	return 0;
}

 

转载自：http://blog.csdn.net/kickxxx/article/details/7714880