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-rw-r--r--spa/plugins/libcamera/libcamera-manager.cpp488
1 files changed, 488 insertions, 0 deletions
diff --git a/spa/plugins/libcamera/libcamera-manager.cpp b/spa/plugins/libcamera/libcamera-manager.cpp
new file mode 100644
index 0000000..afba403
--- /dev/null
+++ b/spa/plugins/libcamera/libcamera-manager.cpp
@@ -0,0 +1,488 @@
+/* Spa libcamera manager
+ *
+ * Copyright © 2021 Wim Taymans
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stddef.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <limits.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <utility>
+#include <mutex>
+#include <optional>
+#include <queue>
+
+#include <libcamera/camera.h>
+#include <libcamera/camera_manager.h>
+
+#include <linux/videodev2.h>
+
+using namespace libcamera;
+
+#include <spa/support/log.h>
+#include <spa/utils/type.h>
+#include <spa/utils/keys.h>
+#include <spa/utils/names.h>
+#include <spa/utils/result.h>
+#include <spa/utils/string.h>
+#include <spa/support/loop.h>
+#include <spa/support/plugin.h>
+#include <spa/monitor/device.h>
+#include <spa/monitor/utils.h>
+
+#include "libcamera.h"
+#include "libcamera-manager.hpp"
+
+#define MAX_DEVICES 64
+
+namespace {
+
+struct device {
+ uint32_t id;
+ std::shared_ptr<Camera> camera;
+};
+
+struct impl {
+ struct spa_handle handle;
+ struct spa_device device = {};
+
+ struct spa_log *log;
+ struct spa_loop_utils *loop_utils;
+
+ struct spa_hook_list hooks;
+
+ static constexpr uint64_t info_all = SPA_DEVICE_CHANGE_MASK_FLAGS | SPA_DEVICE_CHANGE_MASK_PROPS;
+ struct spa_device_info info = SPA_DEVICE_INFO_INIT();
+
+ std::shared_ptr<CameraManager> manager;
+ void addCamera(std::shared_ptr<libcamera::Camera> camera);
+ void removeCamera(std::shared_ptr<libcamera::Camera> camera);
+
+ struct device devices[MAX_DEVICES];
+ uint32_t n_devices = 0;
+
+ struct hotplug_event {
+ enum class type { add, remove } type;
+ std::shared_ptr<Camera> camera;
+ };
+
+ std::mutex hotplug_events_lock;
+ std::queue<hotplug_event> hotplug_events;
+ struct spa_source *hotplug_event_source;
+
+ impl(spa_log *log, spa_loop_utils *loop_utils, spa_source *hotplug_event_source);
+
+ ~impl()
+ {
+ spa_loop_utils_destroy_source(loop_utils, hotplug_event_source);
+ }
+};
+
+}
+
+static std::weak_ptr<CameraManager> global_manager;
+
+std::shared_ptr<CameraManager> libcamera_manager_acquire(int& res)
+{
+ if (auto manager = global_manager.lock())
+ return manager;
+
+ auto manager = std::make_shared<CameraManager>();
+ if ((res = manager->start()) < 0)
+ return {};
+
+ global_manager = manager;
+
+ return manager;
+}
+static uint32_t get_free_id(struct impl *impl)
+{
+ for (std::size_t i = 0; i < MAX_DEVICES; i++)
+ if (impl->devices[i].camera == nullptr)
+ return i;
+ return 0;
+}
+
+static struct device *add_device(struct impl *impl, std::shared_ptr<Camera> camera)
+{
+ struct device *device;
+ uint32_t id;
+
+ if (impl->n_devices >= MAX_DEVICES)
+ return NULL;
+ id = get_free_id(impl);;
+ device = &impl->devices[id];
+ device->id = get_free_id(impl);;
+ device->camera = std::move(camera);
+ impl->n_devices++;
+ return device;
+}
+
+static struct device *find_device(struct impl *impl, const Camera *camera)
+{
+ uint32_t i;
+ for (i = 0; i < impl->n_devices; i++) {
+ if (impl->devices[i].camera.get() == camera)
+ return &impl->devices[i];
+ }
+ return NULL;
+}
+
+static void remove_device(struct impl *impl, struct device *device)
+{
+ uint32_t old = --impl->n_devices;
+ device->camera.reset();
+ *device = std::move(impl->devices[old]);
+ impl->devices[old].camera = nullptr;
+}
+
+static void clear_devices(struct impl *impl)
+{
+ while (impl->n_devices > 0)
+ impl->devices[--impl->n_devices].camera.reset();
+}
+
+static int emit_object_info(struct impl *impl, struct device *device)
+{
+ struct spa_device_object_info info;
+ uint32_t id = device->id;
+ struct spa_dict_item items[20];
+ struct spa_dict dict;
+ uint32_t n_items = 0;
+ char path[256];
+
+ info = SPA_DEVICE_OBJECT_INFO_INIT();
+
+ info.type = SPA_TYPE_INTERFACE_Device;
+ info.factory_name = SPA_NAME_API_LIBCAMERA_DEVICE;
+ info.change_mask = SPA_DEVICE_OBJECT_CHANGE_MASK_FLAGS |
+ SPA_DEVICE_OBJECT_CHANGE_MASK_PROPS;
+ info.flags = 0;
+
+#define ADD_ITEM(key, value) items[n_items++] = SPA_DICT_ITEM_INIT(key, value)
+ ADD_ITEM(SPA_KEY_DEVICE_ENUM_API,"libcamera.manager");
+ ADD_ITEM(SPA_KEY_DEVICE_API, "libcamera");
+ ADD_ITEM(SPA_KEY_MEDIA_CLASS, "Video/Device");
+ snprintf(path, sizeof(path), "%s", device->camera->id().c_str());
+ ADD_ITEM(SPA_KEY_API_LIBCAMERA_PATH, path);
+#undef ADD_ITEM
+
+ dict = SPA_DICT_INIT(items, n_items);
+ info.props = &dict;
+ spa_device_emit_object_info(&impl->hooks, id, &info);
+
+ return 1;
+}
+
+static void try_add_camera(struct impl *impl, std::shared_ptr<Camera> camera)
+{
+ struct device *device;
+
+ if ((device = find_device(impl, camera.get())) != NULL)
+ return;
+
+ if ((device = add_device(impl, std::move(camera))) == NULL)
+ return;
+
+ spa_log_info(impl->log, "camera added: id:%d %s", device->id,
+ device->camera->id().c_str());
+ emit_object_info(impl, device);
+}
+
+static void try_remove_camera(struct impl *impl, const Camera *camera)
+{
+ struct device *device;
+
+ if ((device = find_device(impl, camera)) == NULL)
+ return;
+
+ spa_log_info(impl->log, "camera removed: id:%d %s", device->id,
+ device->camera->id().c_str());
+ spa_device_emit_object_info(&impl->hooks, device->id, NULL);
+ remove_device(impl, device);
+}
+
+static void consume_hotplug_event(struct impl *impl, impl::hotplug_event& event)
+{
+ auto& [ type, camera ] = event;
+
+ switch (type) {
+ case impl::hotplug_event::type::add:
+ spa_log_info(impl->log, "camera appeared: %s", camera->id().c_str());
+ try_add_camera(impl, std::move(camera));
+ break;
+ case impl::hotplug_event::type::remove:
+ spa_log_info(impl->log, "camera disappeared: %s", camera->id().c_str());
+ try_remove_camera(impl, camera.get());
+ break;
+ }
+}
+
+static void on_hotplug_event(void *data, std::uint64_t)
+{
+ auto impl = static_cast<struct impl *>(data);
+
+ for (;;) {
+ std::optional<impl::hotplug_event> event;
+
+ {
+ std::unique_lock guard(impl->hotplug_events_lock);
+
+ if (!impl->hotplug_events.empty()) {
+ event = std::move(impl->hotplug_events.front());
+ impl->hotplug_events.pop();
+ }
+ }
+
+ if (!event)
+ break;
+
+ consume_hotplug_event(impl, *event);
+ }
+}
+
+void impl::addCamera(std::shared_ptr<Camera> camera)
+{
+ {
+ std::unique_lock guard(hotplug_events_lock);
+ hotplug_events.push({ hotplug_event::type::add, std::move(camera) });
+ }
+
+ spa_loop_utils_signal_event(loop_utils, hotplug_event_source);
+}
+
+void impl::removeCamera(std::shared_ptr<Camera> camera)
+{
+ {
+ std::unique_lock guard(hotplug_events_lock);
+ hotplug_events.push({ hotplug_event::type::remove, std::move(camera) });
+ }
+
+ spa_loop_utils_signal_event(loop_utils, hotplug_event_source);
+}
+
+static void start_monitor(struct impl *impl)
+{
+ impl->manager->cameraAdded.connect(impl, &impl::addCamera);
+ impl->manager->cameraRemoved.connect(impl, &impl::removeCamera);
+}
+
+static int stop_monitor(struct impl *impl)
+{
+ if (impl->manager) {
+ impl->manager->cameraAdded.disconnect(impl, &impl::addCamera);
+ impl->manager->cameraRemoved.disconnect(impl, &impl::removeCamera);
+ }
+ clear_devices (impl);
+ return 0;
+}
+
+static void collect_existing_devices(struct impl *impl)
+{
+ auto cameras = impl->manager->cameras();
+
+ for (std::shared_ptr<Camera>& camera : cameras)
+ try_add_camera(impl, std::move(camera));
+}
+
+static const struct spa_dict_item device_info_items[] = {
+ { SPA_KEY_DEVICE_API, "libcamera" },
+ { SPA_KEY_DEVICE_NICK, "libcamera-manager" },
+};
+
+static void emit_device_info(struct impl *impl, bool full)
+{
+ uint64_t old = full ? impl->info.change_mask : 0;
+ if (full)
+ impl->info.change_mask = impl->info_all;
+ if (impl->info.change_mask) {
+ struct spa_dict dict;
+ dict = SPA_DICT_INIT_ARRAY(device_info_items);
+ impl->info.props = &dict;
+ spa_device_emit_info(&impl->hooks, &impl->info);
+ impl->info.change_mask = old;
+ }
+}
+
+static void impl_hook_removed(struct spa_hook *hook)
+{
+ struct impl *impl = (struct impl*)hook->priv;
+ if (spa_hook_list_is_empty(&impl->hooks)) {
+ stop_monitor(impl);
+ impl->manager.reset();
+ }
+}
+
+static int
+impl_device_add_listener(void *object, struct spa_hook *listener,
+ const struct spa_device_events *events, void *data)
+{
+ int res;
+ struct impl *impl = (struct impl*) object;
+ struct spa_hook_list save;
+ bool had_manager = !!impl->manager;
+
+ spa_return_val_if_fail(impl != NULL, -EINVAL);
+ spa_return_val_if_fail(events != NULL, -EINVAL);
+
+ if (!impl->manager && !(impl->manager = libcamera_manager_acquire(res)))
+ return res;
+
+ spa_hook_list_isolate(&impl->hooks, &save, listener, events, data);
+
+ emit_device_info(impl, true);
+
+ if (had_manager) {
+ for (std::size_t i = 0; i < impl->n_devices; i++)
+ emit_object_info(impl, &impl->devices[i]);
+ }
+ else {
+ collect_existing_devices(impl);
+ start_monitor(impl);
+ }
+
+ spa_hook_list_join(&impl->hooks, &save);
+
+ listener->removed = impl_hook_removed;
+ listener->priv = impl;
+
+ return 0;
+}
+
+static const struct spa_device_methods impl_device = {
+ SPA_VERSION_DEVICE_METHODS,
+ .add_listener = impl_device_add_listener,
+};
+
+static int impl_get_interface(struct spa_handle *handle, const char *type, void **interface)
+{
+ struct impl *impl;
+
+ spa_return_val_if_fail(handle != NULL, -EINVAL);
+ spa_return_val_if_fail(interface != NULL, -EINVAL);
+
+ impl = (struct impl *) handle;
+
+ if (spa_streq(type, SPA_TYPE_INTERFACE_Device))
+ *interface = &impl->device;
+ else
+ return -ENOENT;
+
+ return 0;
+}
+
+static int impl_clear(struct spa_handle *handle)
+{
+ auto impl = reinterpret_cast<struct impl *>(handle);
+
+ stop_monitor(impl);
+ std::destroy_at(impl);
+
+ return 0;
+}
+
+impl::impl(spa_log *log, spa_loop_utils *loop_utils, spa_source *hotplug_event_source)
+ : handle({ SPA_VERSION_HANDLE, impl_get_interface, impl_clear }),
+ log(log),
+ loop_utils(loop_utils),
+ hotplug_event_source(hotplug_event_source)
+{
+ libcamera_log_topic_init(log);
+
+ spa_hook_list_init(&hooks);
+
+ device.iface = SPA_INTERFACE_INIT(
+ SPA_TYPE_INTERFACE_Device,
+ SPA_VERSION_DEVICE,
+ &impl_device, this);
+}
+
+static size_t
+impl_get_size(const struct spa_handle_factory *factory,
+ const struct spa_dict *params)
+{
+ return sizeof(struct impl);
+}
+
+static int
+impl_init(const struct spa_handle_factory *factory,
+ struct spa_handle *handle,
+ const struct spa_dict *info,
+ const struct spa_support *support,
+ uint32_t n_support)
+{
+ spa_return_val_if_fail(factory != NULL, -EINVAL);
+ spa_return_val_if_fail(handle != NULL, -EINVAL);
+
+ auto log = static_cast<spa_log *>(spa_support_find(support, n_support, SPA_TYPE_INTERFACE_Log));
+
+ auto loop_utils = static_cast<spa_loop_utils *>(spa_support_find(support, n_support, SPA_TYPE_INTERFACE_LoopUtils));
+ if (!loop_utils) {
+ spa_log_error(log, "a " SPA_TYPE_INTERFACE_LoopUtils " is needed");
+ return -EINVAL;
+ }
+
+ auto hotplug_event_source = spa_loop_utils_add_event(loop_utils, on_hotplug_event, handle);
+ if (!hotplug_event_source) {
+ int res = -errno;
+ spa_log_error(log, "failed to create hotplug event: %m");
+ return res;
+ }
+
+ new (handle) impl(log, loop_utils, hotplug_event_source);
+
+ return 0;
+}
+
+static const struct spa_interface_info impl_interfaces[] = {
+ {SPA_TYPE_INTERFACE_Device,},
+};
+
+static int
+impl_enum_interface_info(const struct spa_handle_factory *factory,
+ const struct spa_interface_info **info,
+ uint32_t *index)
+{
+ spa_return_val_if_fail(factory != NULL, -EINVAL);
+ spa_return_val_if_fail(info != NULL, -EINVAL);
+ spa_return_val_if_fail(index != NULL, -EINVAL);
+
+ if (*index >= SPA_N_ELEMENTS(impl_interfaces))
+ return 0;
+
+ *info = &impl_interfaces[(*index)++];
+ return 1;
+}
+
+extern "C" {
+const struct spa_handle_factory spa_libcamera_manager_factory = {
+ SPA_VERSION_HANDLE_FACTORY,
+ SPA_NAME_API_LIBCAMERA_ENUM_MANAGER,
+ NULL,
+ impl_get_size,
+ impl_init,
+ impl_enum_interface_info,
+};
+}