device: add device object

Make a device object, let the v4l2 monitor create device objects
The device object is responsible for dynamically creating nodes.

src/modules/spa/module-device.c

@@ -0,0 +1,117 @@
+/* PipeWire
+ * Copyright © 2018 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <errno.h>
+#include <getopt.h>
+#include <limits.h>
+
+#include <pipewire/core.h>
+#include <pipewire/log.h>
+#include <pipewire/module.h>
+#include <pipewire/utils.h>
+
+#include "spa-monitor.h"
+#include "spa-device.h"
+
+static const struct spa_dict_item module_props[] = {
+	{ PW_MODULE_PROP_AUTHOR, "Wim Taymans <wim.taymans@gmail.com>" },
+	{ PW_MODULE_PROP_DESCRIPTION, "Load and manage an SPA device" },
+	{ PW_MODULE_PROP_VERSION, PACKAGE_VERSION },
+};
+
+struct device_data {
+	struct pw_device *this;
+	struct pw_core *core;
+	struct pw_properties *properties;
+
+	struct spa_hook module_listener;
+};
+
+static void module_destroy(void *_data)
+{
+	struct device_data *data = _data;
+	pw_device_destroy(data->this);
+}
+
+static const struct pw_module_events module_events = {
+	PW_VERSION_MODULE_EVENTS,
+	.destroy = module_destroy,
+};
+
+int pipewire__module_init(struct pw_module *module, const char *args)
+{
+	struct pw_properties *props = NULL;
+	char **argv;
+	int n_tokens;
+	struct pw_core *core = pw_module_get_core(module);
+	struct pw_device *device;
+        struct device_data *data;
+
+	if (args == NULL)
+		goto wrong_arguments;
+
+	argv = pw_split_strv(args, " \t", 4, &n_tokens);
+	if (n_tokens < 3)
+		goto not_enough_arguments;
+
+	if (n_tokens == 4) {
+		props = pw_properties_new_string(argv[3]);
+		if (props == NULL)
+			return -ENOMEM;
+	}
+
+	device = pw_spa_device_load(core,
+				NULL,
+				pw_module_get_global(module),
+				argv[0], argv[1], argv[2],
+				0,
+				props,
+				sizeof(struct device_data));
+
+	pw_free_strv(argv);
+
+	if (device == NULL)
+		return -ENOMEM;
+
+	data = pw_spa_device_get_user_data(device);
+	data->this = device;
+	data->core = core;
+	data->properties = props;
+
+	pw_log_debug("module %p: new", module);
+	pw_module_add_listener(module, &data->module_listener, &module_events, data);
+
+	pw_module_update_properties(module, &SPA_DICT_INIT_ARRAY(module_props));
+
+	return 0;
+
+      not_enough_arguments:
+	pw_free_strv(argv);
+      wrong_arguments:
+	pw_log_error("usage: module-spa-device <plugin> <factory> <name> [key=value ...]");
+	return -EINVAL;
+}