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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2020, Collabora Ltd.
* Author: Nicolas Dufresne <nicolas.dufresne@collabora.com>
*
* GStreamer Device Provider
*/
#include <array>
#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([[maybe_unused]] 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_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)
{
static const std::array roles{ StreamRole::VideoRecording };
g_autoptr(GstCaps) caps = gst_caps_new_empty();
const gchar *name = camera->id().c_str();
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);
return nullptr;
}
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;
};
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);
std::shared_ptr<CameraManager> 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.
*/
cm = gst_libcamera_get_camera_manager(ret);
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->id().c_str());
GstDevice *dev = gst_libcamera_device_new(camera);
if (!dev) {
GST_ERROR_OBJECT(self, "Failed to add camera '%s'",
camera->id().c_str());
return nullptr;
}
devices = g_list_append(devices,
g_object_ref_sink(dev));
}
return devices;
}
static void
gst_libcamera_provider_init(GstLibcameraProvider *self)
{
GstDeviceProvider *provider = GST_DEVICE_PROVIDER(self);
/* Avoid devices being duplicated. */
gst_device_provider_hide_provider(provider, "v4l2deviceprovider");
}
static void
gst_libcamera_provider_class_init(GstLibcameraProviderClass *klass)
{
GstDeviceProviderClass *provider_class = GST_DEVICE_PROVIDER_CLASS(klass);
provider_class->probe = gst_libcamera_provider_probe;
gst_device_provider_class_set_metadata(provider_class,
"libcamera Device Provider",
"Source/Video",
"List camera device using libcamera",
"Nicolas Dufresne <nicolas.dufresne@collabora.com>");
}
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