samples: drivers: video: use a macro to simplify format logging

A macro introduced allows to log four-character-codes (FOURCC) as one
string instead of enumerating each individual character. This saves a bit
of room in the code and is less error-prone.

Signed-off-by: Josuah Demangeon <me@josuah.net>

Author: josuah

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

@@ -120,11 +120,10 @@ int main(void)
 	while (caps.format_caps[i].pixelformat) {
 		const struct video_format_cap *fcap = &caps.format_caps[i];
 		/* fourcc to string */
-		LOG_INF("  %c%c%c%c width [%u; %u; %u] height [%u; %u; %u]",
-		       (char)fcap->pixelformat, (char)(fcap->pixelformat >> 8),
-		       (char)(fcap->pixelformat >> 16), (char)(fcap->pixelformat >> 24),
-		       fcap->width_min, fcap->width_max, fcap->width_step, fcap->height_min,
-		       fcap->height_max, fcap->height_step);
+		LOG_INF("  %s width [%u; %u; %u] height [%u; %u; %u]",
+		       VIDEO_FOURCC_TO_STR(fcap->pixelformat),
+		       fcap->width_min, fcap->width_max, fcap->width_step,
+		       fcap->height_min, fcap->height_max, fcap->height_step);
 		i++;
 	}
 
@@ -147,9 +146,8 @@ int main(void)
 		fmt.pixelformat = VIDEO_FOURCC_FROM_STR(CONFIG_VIDEO_PIXEL_FORMAT);
 	}
 
-	LOG_INF("- Video format: %c%c%c%c %ux%u", (char)fmt.pixelformat,
-	       (char)(fmt.pixelformat >> 8), (char)(fmt.pixelformat >> 16),
-	       (char)(fmt.pixelformat >> 24), fmt.width, fmt.height);
+	LOG_INF("- Video format: %s %ux%u",
+		VIDEO_FOURCC_TO_STR(fmt.pixelformat), fmt.width, fmt.height);
 
 	if (video_set_format(video_dev, VIDEO_EP_OUT, &fmt)) {
 		LOG_ERR("Unable to set format");

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

@@ -94,9 +94,8 @@ int main(void)
 		return 0;
 	}
 
-	printk("Video device detected, format: %c%c%c%c %ux%u\n", (char)fmt.pixelformat,
-	       (char)(fmt.pixelformat >> 8), (char)(fmt.pixelformat >> 16),
-	       (char)(fmt.pixelformat >> 24), fmt.width, fmt.height);
+	printk("Video device detected, format: %s %ux%u\n",
+		VIDEO_FOURCC_TO_STR(fmt.pixelformat), fmt.width, fmt.height);
 
 	if (caps.min_line_count != LINE_COUNT_HEIGHT) {
 		LOG_ERR("Partial framebuffers not supported by this sample");