cam: Use script parser to set controls

Add a "--script" option to the cam test application to allow specify a
capture script to be used to drive the capture session. Add to the
CameraSession class a script parser instance, created conditionally to
the OptCaptureScript option.

If the script parser has been created, use it at queueRequest time to
retrieve the list of controls that has to be associated with a Request,
and populate Request::controls() with it before queueing it to the
Camera.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

4 files changed, 22 insertions, 0 deletions

diff --git a/src/cam/camera_session.cpp b/src/cam/camera_session.cpp
index 0bb95c8b..76d552d9 100644
--- a/src/cam/camera_session.cpp
+++ b/src/cam/camera_session.cpp
@@ -14,6 +14,7 @@
 #include <libcamera/property_ids.h>
 
 #include "camera_session.h"
+#include "capture_script.h"
 #include "event_loop.h"
 #include "file_sink.h"
 #ifdef HAVE_KMS
@@ -91,6 +92,16 @@ CameraSession::CameraSession(CameraManager *cm,
 	}
 #endif
 
+	if (options_.isSet(OptCaptureScript)) {
+		std::string scriptName = options_[OptCaptureScript].toString();
+		script_ = std::make_unique<CaptureScript>(camera_, scriptName);
+		if (!script_->valid()) {
+			std::cerr << "Invalid capture script '" << scriptName
+				  << "'" << std::endl;
+			return;
+		}
+	}
+
 	switch (config->validate()) {
 	case CameraConfiguration::Valid:
 		break;
@@ -322,6 +333,9 @@ int CameraSession::queueRequest(Request *request)
 	if (captureLimit_ && queueCount_ >= captureLimit_)
 		return 0;
 
+	if (script_)
+		request->controls() = script_->frameControls(queueCount_);
+
 	queueCount_++;
 
 	return camera_->queueRequest(request);
diff --git a/src/cam/camera_session.h b/src/cam/camera_session.h
index bf966bd1..d562caae 100644
--- a/src/cam/camera_session.h
+++ b/src/cam/camera_session.h
@@ -23,6 +23,7 @@
 
 #include "options.h"
 
+class CaptureScript;
 class FrameSink;
 
 class CameraSession
@@ -60,6 +61,8 @@ private:
 	std::shared_ptr<libcamera::Camera> camera_;
 	std::unique_ptr<libcamera::CameraConfiguration> config_;
 
+	std::unique_ptr<CaptureScript> script_;
+
 	std::map<const libcamera::Stream *, std::string> streamNames_;
 	std::unique_ptr<FrameSink> sink_;
 	unsigned int cameraIndex_;
diff --git a/src/cam/main.cpp b/src/cam/main.cpp
index c7f664b9..9c3370d7 100644
--- a/src/cam/main.cpp
+++ b/src/cam/main.cpp
@@ -158,6 +158,10 @@ int CamApp::parseOptions(int argc, char *argv[])
 			 "Print the metadata for completed requests",
 			 "metadata", ArgumentNone, nullptr, false,
 			 OptCamera);
+	parser.addOption(OptCaptureScript, OptionString,
+			 "Load a capture session configuration script from a file",
+			 "script", ArgumentRequired, "script", false,
+			 OptCamera);
 
 	options_ = parser.parse(argc, argv);
 	if (!options_.valid())
diff --git a/src/cam/main.h b/src/cam/main.h
index 62f7bbc9..51b87927 100644
--- a/src/cam/main.h
+++ b/src/cam/main.h
@@ -21,4 +21,5 @@ enum {
 	OptListControls = 256,
 	OptStrictFormats = 257,
 	OptMetadata = 258,
+	OptCaptureScript = 259,
 };