libcamera: Remove StreamRoles alias

Now that `Camera::generateConfiguration()` takes a `libcamera::Span`
of `StreamRole`, remove the `StreamRoles` type, which was an alias
to `std::vector<libcamera::StreamRole>`.

The removal has two reasons:
 - it is no longer strictly necessary,
 - its presence may suggest that that is the preferred (or correct)
   way to build/pass a list of `StreamRole`.

Signed-off-by: Barnabás Pőcze <pobrn@protonmail.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
[Kieran: Fix small checkstyle report on roles initialiser]
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

include/libcamera/stream.h

@@ -69,8 +69,6 @@ enum class StreamRole {
 	Viewfinder,
 };
 
-using StreamRoles = std::vector<StreamRole>;
-
 std::ostream &operator<<(std::ostream &out, StreamRole role);
 
 class Stream

src/apps/cam/camera_session.cpp

@@ -55,7 +55,7 @@ CameraSession::CameraSession(CameraManager *cm,
 		return;
 	}
 
-	StreamRoles roles = StreamKeyValueParser::roles(options_[OptStream]);
+	std::vector<StreamRole> roles = StreamKeyValueParser::roles(options_[OptStream]);
 
 	std::unique_ptr<CameraConfiguration> config =
 		camera_->generateConfiguration(roles);

src/apps/common/stream_options.cpp

@@ -40,7 +40,7 @@ KeyValueParser::Options StreamKeyValueParser::parse(const char *arguments)
 	return options;
 }
 
-StreamRoles StreamKeyValueParser::roles(const OptionValue &values)
+std::vector<StreamRole> StreamKeyValueParser::roles(const OptionValue &values)
 {
 	/* If no configuration values to examine default to viewfinder. */
 	if (values.empty())
@@ -48,7 +48,7 @@ StreamRoles StreamKeyValueParser::roles(const OptionValue &values)
 
 	const std::vector<OptionValue> &streamParameters = values.toArray();
 
-	StreamRoles roles;
+	std::vector<StreamRole> roles;
 	for (auto const &value : streamParameters) {
 		/* If a role is invalid default it to viewfinder. */
 		roles.push_back(parseRole(value.toKeyValues()).value_or(StreamRole::Viewfinder));

src/apps/common/stream_options.h

@@ -20,7 +20,7 @@ public:
 
 	KeyValueParser::Options parse(const char *arguments) override;
 
-	static libcamera::StreamRoles roles(const OptionValue &values);
+	static std::vector<libcamera::StreamRole> roles(const OptionValue &values);
 	static int updateConfiguration(libcamera::CameraConfiguration *config,
 				       const OptionValue &values);
 

src/apps/qcam/main_window.cpp

@@ -362,7 +362,7 @@ void MainWindow::toggleCapture(bool start)
  */
 int MainWindow::startCapture()
 {
-	StreamRoles roles = StreamKeyValueParser::roles(options_[OptStream]);
+	std::vector<StreamRole> roles = StreamKeyValueParser::roles(options_[OptStream]);
 	int ret;
 
 	/* Verify roles are supported. */

src/gstreamer/gstlibcameraprovider.cpp

@@ -6,6 +6,8 @@
  * gstlibcameraprovider.c - GStreamer Device Provider
  */
 
+#include <array>
+
 #include "gstlibcameraprovider.h"
 
 #include <libcamera/camera.h>
@@ -141,11 +143,10 @@ gst_libcamera_device_class_init(GstLibcameraDeviceClass *klass)
 static GstDevice *
 gst_libcamera_device_new(const std::shared_ptr<Camera> &camera)
 {
+	static const std::array roles{ StreamRole::VideoRecording };
 	g_autoptr(GstCaps) caps = gst_caps_new_empty();
 	const gchar *name = camera->id().c_str();
-	StreamRoles roles;
 
-	roles.push_back(StreamRole::VideoRecording);
 	std::unique_ptr<CameraConfiguration> config = camera->generateConfiguration(roles);
 	if (!config || config->size() != roles.size()) {
 		GST_ERROR("Failed to generate a default configuration for %s", name);

src/gstreamer/gstlibcamerasrc.cpp

@@ -466,7 +466,7 @@ gst_libcamera_src_task_enter(GstTask *task, [[maybe_unused]] GThread *thread,
 	GST_DEBUG_OBJECT(self, "Streaming thread has started");
 
 	gint stream_id_num = 0;
-	StreamRoles roles;
+	std::vector<StreamRole> roles;
 	for (GstPad *srcpad : state->srcpads_) {
 		/* Create stream-id and push stream-start. */
 		g_autofree gchar *stream_id_intermediate = g_strdup_printf("%i%i", state->group_id_, stream_id_num++);

src/libcamera/stream.cpp

@@ -436,11 +436,6 @@ std::ostream &operator<<(std::ostream &out, StreamRole role)
 	return out;
 }
 
-/**
- * \typedef StreamRoles
- * \brief A vector of StreamRole
- */
-
 /**
  * \class Stream
  * \brief Video stream for a camera