1 files changed, 238 insertions, 0 deletions
diff --git a/src/gstreamer/gstlibcameraprovider.cpp b/src/gstreamer/gstlibcameraprovider.cpp
new file mode 100644
index 00000000..914ed4fb
--- /dev/null
+++ b/src/gstreamer/gstlibcameraprovider.cpp
@@ -0,0 +1,238 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2020, Collabora Ltd.
+ *     Author: Nicolas Dufresne <nicolas.dufresne@collabora.com>
+ *
+ * gstlibcameraprovider.c - GStreamer Device Provider
+ */
+
+#include "gstlibcameraprovider.h"
+
+#include <libcamera/camera.h>
+#include <libcamera/camera_manager.h>
+
+#include "gstlibcamerasrc.h"
+#include "gstlibcamera-utils.h"
+
+using namespace libcamera;
+
+GST_DEBUG_CATEGORY_STATIC(provider_debug);
+#define GST_CAT_DEFAULT provider_debug
+
+/**
+ * \struct _GstLibcameraDevice
+ * \brief libcamera GstDevice implementation
+ *
+ * This object is used by GstLibcameraProvider to abstract a libcamera
+ * device. It also provides helpers to create and configure the
+ * libcamerasrc GstElement to be used with this device. The implementation is
+ * private to the plugin.
+ */
+
+enum {
+	PROP_DEVICE_NAME = 1,
+};
+
+#define GST_TYPE_LIBCAMERA_DEVICE gst_libcamera_device_get_type()
+G_DECLARE_FINAL_TYPE(GstLibcameraDevice, gst_libcamera_device,
+		     GST_LIBCAMERA, DEVICE, GstDevice);
+
+struct _GstLibcameraDevice {
+	GstDevice parent;
+	gchar *name;
+};
+
+G_DEFINE_TYPE(GstLibcameraDevice, gst_libcamera_device, GST_TYPE_DEVICE);
+
+static GstElement *
+gst_libcamera_device_create_element(GstDevice *device, const gchar *name)
+{
+	GstElement *source = gst_element_factory_make("libcamerasrc", name);
+
+	/*
+	 * Provider and source lives in the same plugin, so making the source
+	 * should never fail.
+	 */
+	g_assert(source);
+
+	g_object_set(source, "camera-name", GST_LIBCAMERA_DEVICE(device)->name, nullptr);
+
+	return source;
+}
+
+static gboolean
+gst_libcamera_device_reconfigure_element(GstDevice *device,
+					 GstElement *element)
+{
+	if (!GST_LIBCAMERA_IS_SRC(element))
+		return FALSE;
+
+	g_object_set(element, "camera-name", GST_LIBCAMERA_DEVICE(device)->name, nullptr);
+
+	return TRUE;
+}
+
+static void
+gst_libcamera_device_set_property(GObject *object, guint prop_id,
+				  const GValue *value, GParamSpec *pspec)
+{
+	GstLibcameraDevice *device = GST_LIBCAMERA_DEVICE(object);
+
+	switch (prop_id) {
+	case PROP_DEVICE_NAME:
+		device->name = g_value_dup_string(value);
+		break;
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+		break;
+	}
+}
+
+static void
+gst_libcamera_device_init(GstLibcameraDevice *self)
+{
+}
+
+static void
+gst_libcamera_device_finalize(GObject *object)
+{
+	GstLibcameraDevice *self = GST_LIBCAMERA_DEVICE(object);
+	gpointer klass = gst_libcamera_device_parent_class;
+
+	g_free(self->name);
+
+	G_OBJECT_GET_CLASS(klass)->finalize(object);
+}
+
+static void
+gst_libcamera_device_class_init(GstLibcameraDeviceClass *klass)
+{
+	GstDeviceClass *device_class = GST_DEVICE_CLASS(klass);
+	GObjectClass *object_class = G_OBJECT_CLASS(klass);
+
+	device_class->create_element = gst_libcamera_device_create_element;
+	device_class->reconfigure_element = gst_libcamera_device_reconfigure_element;
+
+	object_class->set_property = gst_libcamera_device_set_property;
+	object_class->finalize = gst_libcamera_device_finalize;
+
+	GParamSpec *pspec = g_param_spec_string("name", "Name",
+						"The name of the camera device", "",
+						(GParamFlags)(G_PARAM_STATIC_STRINGS | G_PARAM_WRITABLE |
+							      G_PARAM_CONSTRUCT_ONLY));
+	g_object_class_install_property(object_class, PROP_DEVICE_NAME, pspec);
+}
+
+static GstDevice *
+gst_libcamera_device_new(const std::shared_ptr<Camera> &camera)
+{
+	g_autoptr(GstCaps) caps = gst_caps_new_empty();
+	const gchar *name = camera->name().c_str();
+	StreamRoles roles;
+
+	roles.push_back(StreamRole::VideoRecording);
+	std::unique_ptr<CameraConfiguration> config = camera->generateConfiguration(roles);
+
+	for (const StreamConfiguration &stream_cfg : *config) {
+		GstCaps *sub_caps = gst_libcamera_stream_formats_to_caps(stream_cfg.formats());
+		if (sub_caps)
+			gst_caps_append(caps, sub_caps);
+	}
+
+	return GST_DEVICE(g_object_new(GST_TYPE_LIBCAMERA_DEVICE,
+				       /* \todo Use a unique identifier instead of camera name. */
+				       "name", name,
+				       "display-name", name,
+				       "caps", caps,
+				       "device-class", "Source/Video",
+				       nullptr));
+}
+
+/**
+ * \struct _GstLibcameraProvider
+ * \brief libcamera GstDeviceProvider implementation
+ *
+ * This GstFeature is used by GstDeviceMonitor to probe the available
+ * libcamera devices. The implementation is private to the plugin.
+ */
+
+struct _GstLibcameraProvider {
+	GstDeviceProvider parent;
+	CameraManager *cm;
+};
+
+G_DEFINE_TYPE_WITH_CODE(GstLibcameraProvider, gst_libcamera_provider,
+			GST_TYPE_DEVICE_PROVIDER,
+			GST_DEBUG_CATEGORY_INIT(provider_debug, "libcamera-provider", 0,
+						"libcamera Device Provider"));
+
+static GList *
+gst_libcamera_provider_probe(GstDeviceProvider *provider)
+{
+	GstLibcameraProvider *self = GST_LIBCAMERA_PROVIDER(provider);
+	CameraManager *cm = self->cm;
+	GList *devices = nullptr;
+	gint ret;
+
+	GST_INFO_OBJECT(self, "Probing cameras using libcamera");
+
+	/* \todo Move the CameraMananger start()/stop() calls into
+	 * GstDeviceProvider start()/stop() virtual function when CameraMananger
+	 * gains monitoring support. Meanwhile we need to cycle start()/stop()
+	 * to ensure every probe() calls return the latest list.
+	 */
+	ret = cm->start();
+	if (ret) {
+		GST_ERROR_OBJECT(self, "Failed to retrieve device list: %s",
+				 g_strerror(-ret));
+		return nullptr;
+	}
+
+	for (const std::shared_ptr<Camera> &camera : cm->cameras()) {
+		GST_INFO_OBJECT(self, "Found camera '%s'", camera->name().c_str());
+		devices = g_list_append(devices,
+					g_object_ref_sink(gst_libcamera_device_new(camera)));
+	}
+
+	cm->stop();
+
+	return devices;
+}
+
+static void
+gst_libcamera_provider_init(GstLibcameraProvider *self)
+{
+	GstDeviceProvider *provider = GST_DEVICE_PROVIDER(self);
+
+	self->cm = new CameraManager();
+
+	/* Avoid devices being duplicated. */
+	gst_device_provider_hide_provider(provider, "v4l2deviceprovider");
+}
+
+static void
+gst_libcamera_provider_finalize(GObject *object)
+{
+	GstLibcameraProvider *self = GST_LIBCAMERA_PROVIDER(object);
+	gpointer klass = gst_libcamera_provider_parent_class;
+
+	delete self->cm;
+
+	return G_OBJECT_GET_CLASS(klass)->finalize(object);
+}
+
+static void
+gst_libcamera_provider_class_init(GstLibcameraProviderClass *klass)
+{
+	GstDeviceProviderClass *provider_class = GST_DEVICE_PROVIDER_CLASS(klass);
+	GObjectClass *object_class = G_OBJECT_CLASS(klass);
+
+	provider_class->probe = gst_libcamera_provider_probe;
+	object_class->finalize = gst_libcamera_provider_finalize;
+
+	gst_device_provider_class_set_metadata(provider_class,
+					       "libcamera Device Provider",
+					       "Source/Video",
+					       "List camera device using libcamera",
+					       "Nicolas Dufresne <nicolas.dufresne@collabora.com>");
+}