[libcamera-devel] [RFC 4/4] apps: cam: Add option to set stream orientation

[Jacopo Mondi]

Add a '--orientation|-o' option to the cam test application to set
an orientation to the image stream.

Supported values are the ones obtained by applying flips to the camera
sensor:
- rot180: Rotate 180 degrees
- flip: vertical flip
- mirror: horizontal flip

Signed-off-by: Jacopo Mondi <jacopo.mondi at ideasonboard.com>
---
 src/apps/cam/camera_session.cpp | 17 +++++++++++++++++
 src/apps/cam/main.cpp           |  5 +++++
 src/apps/cam/main.h             |  1 +
 3 files changed, 23 insertions(+)

diff --git a/src/apps/cam/camera_session.cpp b/src/apps/cam/camera_session.cpp
index 8fcec6304d66..2d6a1440cde2 100644
--- a/src/apps/cam/camera_session.cpp
+++ b/src/apps/cam/camera_session.cpp
@@ -65,6 +65,23 @@ CameraSession::CameraSession(CameraManager *cm,
 		return;
 	}

+	if (options_.isSet(OptOrientation)) {
+		std::string orient = options_[OptOrientation].toString();
+		if (orient == "rot180") {
+			config->orientation =
+				libcamera::CameraConfiguration::rotate180;
+		} else if (orient == "mirror") {
+			config->orientation =
+				libcamera::CameraConfiguration::flipRotate0;
+		} else if (orient == "flip") {
+			config->orientation =
+				libcamera::CameraConfiguration::flipRotate180;
+		} else {
+			std::cerr << "Invalid orientation " << orient << std::endl;
+			return;
+		}
+	}
+
 	/* Apply configuration if explicitly requested. */
 	if (StreamKeyValueParser::updateConfiguration(config.get(),
 						      options_[OptStream])) {
diff --git a/src/apps/cam/main.cpp b/src/apps/cam/main.cpp
index 5d8a57bc14e5..8698d5eedcf8 100644
--- a/src/apps/cam/main.cpp
+++ b/src/apps/cam/main.cpp
@@ -133,6 +133,11 @@ int CamApp::parseOptions(int argc, char *argv[])
 			 "Capture until interrupted by user or until <count> frames captured",
 			 "capture", ArgumentOptional, "count", false,
 			 OptCamera);
+
+	parser.addOption(OptOrientation, OptionString,
+			 "The camera stream image orientation (rot180, mirror, flip)",
+			 "orientation", ArgumentRequired, "orientation", false,
+			 OptCamera);
 #ifdef HAVE_KMS
 	parser.addOption(OptDisplay, OptionString,
 			 "Display viewfinder through DRM/KMS on specified connector",
diff --git a/src/apps/cam/main.h b/src/apps/cam/main.h
index 526aecece3f3..4aa959b32e13 100644
--- a/src/apps/cam/main.h
+++ b/src/apps/cam/main.h
@@ -17,6 +17,7 @@ enum {
 	OptList = 'l',
 	OptListProperties = 'p',
 	OptMonitor = 'm',
+	OptOrientation = 'o',
 	OptSDL = 'S',
 	OptStream = 's',
 	OptListControls = 256,
--
2.40.1