samples: video: capture: Add hflip option

Add an option to mirror the video image horizontally. This helps
to avoid doing so at the post-processing step by using additional
HW such as PxP on i.MX RT platforms.

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

Author: ngphibang

samples/drivers/video/capture/Kconfig

@@ -22,6 +22,11 @@ config VIDEO_PIXEL_FORMAT
 	help
 	  Pixel format of the video frame. If not set, the default pixel format is used.
 
+config VIDEO_CTRL_HFLIP
+	bool "Mirror the video frame horizontally"
+	help
+	  If set, mirror the video frame horizontally
+
 endmenu
 
 source "Kconfig.zephyr"

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

@@ -9,13 +9,12 @@
 
 #include <zephyr/drivers/display.h>
 #include <zephyr/drivers/video.h>
+#include <zephyr/drivers/video-controls.h>
 
 #include <zephyr/logging/log.h>
 LOG_MODULE_REGISTER(main);
 
 #ifdef CONFIG_TEST
-#include <zephyr/drivers/video-controls.h>
-
 #include "check_test_pattern.h"
 
 #define LOG_LEVEL LOG_LEVEL_DBG
@@ -179,6 +178,11 @@ int main(void)
 		fie.index++;
 	}
 
+	/* Set controls */
+	if (IS_ENABLED(CONFIG_VIDEO_CTRL_HFLIP)) {
+		video_set_ctrl(video_dev, VIDEO_CID_HFLIP, (void *)1);
+	}
+
 #ifdef CONFIG_TEST
 	video_set_ctrl(video_dev, VIDEO_CID_TEST_PATTERN, (void *)1);
 #endif