luffy 发表于 2019-12-6 16:44:23

V4L2如何设置帧率？

本帖最后由 luffy 于 2019-12-6 16:54 编辑

RK3399平台
Sensor 支持120FPS, 我设置的60FPS， 但是我v4l2读取速率一直都是30FPS, 测MIPI信号也是差不多60FPS
读取代码如下：

int Camera::readFrame()
{
struct v4l2_buffer buf;
int i, bytesused;

CLEAR(buf);

buf.type = m_bufType;
buf.memory = V4L2_MEMORY_MMAP;

if (V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE == m_bufType) {
    struct v4l2_plane planes;
    buf.m.planes = planes;
    buf.length = FMT_NUM_PLANES;
}

if (-1 == xioctl(m_camfd, VIDIOC_DQBUF, &buf)) {
    ERR("VIDIOC_DQBUF");
    return -1;
}

i = buf.index;

if (V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE == m_bufType)
    bytesused = buf.m.planes.bytesused;
else
    bytesused = buf.bytesused;

uint8_t *pdata = (uint8_t *)(m_imgBuffers.start);
for (size_t i = 0; i < m_width*m_height*2; i+=2) {
    m_rawBuffer = pdata;
    m_rawBuffer = pdata;
}

if (-1 == xioctl(m_camfd, VIDIOC_QBUF, &buf)) {
    ERR("VIDIOC_QBUF");
    return -1;
}

return 0;
}

bool Camera::trigger()
{
struct reg_map regs[] = {
    {0x1100, 0x01},
    {REG_NULL, 0x00},
};
return ioctl(m_camconf_fd, SET_REGS_ONLINE_CMD, regs) == 0 ? true : false;
}

int Camera::nextFrame(std::vector<CameraFrame> &frames)
{
if (m_triggerMode) {
    if (!trigger()) {
      LOG(ERROR) << "trigger error";
      return -1;
    }
}

std::lock_guard<std::mutex> l(m_runLock);
if (!m_isRunning) {
    LOG(ERROR) << "not running, can not read frame";
    return -1;
}

TimeMeasure tm;
tm.addRecord("all");
tm.addRecord("read");
if (readFrame() == -1) {
    return -1;
}
LOG(INFO) << "read frame cost: " << tm.stopRecord("read") << "ms";

CameraFrame frame;
frame.pdata = m_rawBuffer;
frame.step = m_width * 2;
frame.type = kTypeGray;
frame.width = m_width;
frame.height = m_height;
frame.fmt = kFmt16Gray;
frames.push_back(frame);

return 0;
}


驱动配置如下:
      {
                .width = 640,
                .height = 480,
                .max_fps = {
                        .numerator = 1,
                        .denominator = 120,
                },
                .hts_def = 640,
                .vts_def = 480,
                .regs_size = ARRAY_SIZE(cam_640x480_regs),
                .reg_list = cam_640x480_regs,
      },static int cam_g_frame_interval(struct v4l2_subdev *sd,
                                    struct v4l2_subdev_frame_interval *fi)
{
      struct mycam *mycam = to_mycam(sd);
      const struct mycam_mode *mode = mycam->cur_mode;

      mutex_lock(&mycam->mutex);
      fi->interval = mode->max_fps;
      mutex_unlock(&mycam->mutex);

      return 0;
}






yy834277137 发表于 2022-6-17 10:55:47

请问解决了吗

via 发表于 2022-12-2 23:36:12

这代码是在哪里？ 可以提供下代码文件？
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