samples: video: capture: Get and enumerate frame rate

Add code to get the current frame rate and enumerate all supported frame
rates (frame intervals) of the current format.

Signed-off-by: Phi Bang Nguyen <phibang.nguyen@nxp.com>

samples/drivers/video/capture/src/main.c

@@ -78,6 +78,8 @@ int main(void)
  struct video_buffer *buffers[CONFIG_VIDEO_BUFFER_POOL_NUM_MAX], *vbuf;
  struct video_format fmt;
  struct video_caps caps;
+ struct video_frmival frmival;
+ struct video_frmival_enum fie;
  unsigned int frame = 0;
  size_t bsize;
  int i = 0;
@@ -129,6 +131,26 @@ int main(void)
  (char)(fmt.pixelformat >> 8), (char)(fmt.pixelformat >> 16),
  (char)(fmt.pixelformat >> 24), fmt.width, fmt.height);
 
+ if (!video_get_frmival(video_dev, VIDEO_EP_OUT, &frmival)) {
+ printk("- Default frame rate : %f fps\n",
+ 1.0 * frmival.denominator / frmival.numerator);
+ }
+
+ printk("- Supported frame intervals for the default format:\n");
+ memset(&fie, 0, sizeof(fie));
+ fie.format = &fmt;
+ while (video_enum_frmival(video_dev, VIDEO_EP_OUT, &fie) == 0) {
+ if (fie.type == VIDEO_FRMIVAL_TYPE_DISCRETE) {
+ printk(" %u/%u ", fie.discrete.numerator, fie.discrete.denominator);
+ } else {
+ printk(" [min = %u/%u; max = %u/%u; step = %u/%u]\n",
+ fie.stepwise.min.numerator, fie.stepwise.min.denominator,
+ fie.stepwise.max.numerator, fie.stepwise.max.denominator,
+ fie.stepwise.step.numerator, fie.stepwise.step.denominator);
+ }
+ fie.index++;
+ }
+
 #if DT_HAS_CHOSEN(zephyr_display)
  const struct device *const display_dev = DEVICE_DT_GET(DT_CHOSEN(zephyr_display));