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   源码介绍

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RK3588图像采集测试程序

#include <signal.h>
#include <stdbool.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <poll.h>
#include <linux/videodev2.h>

#include "util.h"
#include "drm.h"

#define V4l2_PLANE_NUM 1

struct Setup s;

/* ctrl c */
volatile bool g_quit = false;
static void sigint_handler(int signo) {
    (void)signo;
    g_quit = true;
}

static void v4l2_check_capability(int fd) {
    struct v4l2_capability caps;
    memset(&caps, 0, sizeof caps);
    int ret = ioctl(fd, VIDIOC_QUERYCAP, &caps);
    BYE_ON(ret, "VIDIOC_QUERYCAP failed: %s\n", ERRSTR);
    BYE_ON(~caps.capabilities & V4L2_CAP_VIDEO_CAPTURE_MPLANE,
        "video: multiplanar capture is not supported\n");
}

static void v4l2_set_format(int fd) {
    struct v4l2_format fmt;
    memset(&fmt, 0, sizeof fmt);
    fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;

    int ret = ioctl(fd, VIDIOC_G_FMT, &fmt);
    BYE_ON(ret < 0, "VIDIOC_G_FMT failed: %s\n", ERRSTR);
    printf("old format: width = %u, height = %u, 4cc = %.4s\n",
        fmt.fmt.pix.width, fmt.fmt.pix.height,
        (char*)&fmt.fmt.pix.pixelformat);

    fmt.fmt.pix.width = s.w;
    fmt.fmt.pix.height = s.h;
    fmt.fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
    fmt.fmt.pix.xfer_func = V4L2_XFER_FUNC_DEFAULT;
    fmt.fmt.pix.ycbcr_enc = V4L2_YCBCR_ENC_601;
    if (s.in_fourcc)
        fmt.fmt.pix.pixelformat = s.in_fourcc;

    ret = ioctl(fd, VIDIOC_S_FMT, &fmt);
    BYE_ON(ret < 0, "VIDIOC_S_FMT failed: %s\n", ERRSTR);

    ret = ioctl(fd, VIDIOC_G_FMT, &fmt);
    BYE_ON(ret < 0, "VIDIOC_G_FMT failed: %s\n", ERRSTR);
    printf("cur format: width = %u, height = %u, 4cc = %.4s\n",
        fmt.fmt.pix.width, fmt.fmt.pix.height,
        (char*)&fmt.fmt.pix.pixelformat);

    s.in_fourcc = fmt.fmt.pix.pixelformat;
    s.w = fmt.fmt.pix.width;
    s.h = fmt.fmt.pix.height;
    s.size = fmt.fmt.pix.sizeimage;
    s.pitch = fmt.fmt.pix.width; /* for NV12 format image */
}

static void v4l2_request_buffers(int fd) {
    struct v4l2_requestbuffers rqbufs;
    memset(&rqbufs, 0, sizeof(rqbufs));
    rqbufs.count = s.buffer_count;
    rqbufs.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
    rqbufs.memory = V4L2_MEMORY_DMABUF;
    int ret = ioctl(fd, VIDIOC_REQBUFS, &rqbufs);
    BYE_ON(ret < 0, "VIDIOC_REQBUFS failed: %s\n", ERRSTR);
    BYE_ON(rqbufs.count < s.buffer_count, "video node allocated only "
        "%u of %u buffers\n", rqbufs.count, s.buffer_count);
}

static void v4l2_query_buffers(int fd, uint32_t buffer_count) {
    for (unsigned int i = 0; i < buffer_count; i) {
        struct v4l2_plane planes[V4l2_PLANE_NUM];
        memset(&planes, 0, sizeof(planes) * V4l2_PLANE_NUM);

        struct v4l2_buffer buf;
        memset(&buf, 0, sizeof(buf));
        buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
        buf.memory = V4L2_MEMORY_DMABUF;
        buf.index = i;
        buf.m.planes = planes;
        buf.length = V4l2_PLANE_NUM;
        int ret = ioctl(fd, VIDIOC_QUERYBUF, &buf);
        BYE_ON(ret < 0, "VIDIOC_QBUF for buffer %d failed: %s\n", buf.index, ERRSTR);
    }
}

int main(int argc, char *argv[]) {
    signal(SIGINT, sigint_handler);

    /* get command line arguments */
    int ret;
    ret = parse_args(argc, argv, &s);
    BYE_ON(ret, "failed to parse arguments\n");
    BYE_ON(s.module[0] == 0, "DRM module is missing\n");
    BYE_ON(s.video[0] == 0, "video node is missing\n");

    /* open drm device */