examples: add export-spa-device example

src/examples/export-spa-device.c

@@ -0,0 +1,143 @@
+/* PipeWire
+ *
+ * Copyright © 2019 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 <stdio.h>
+#include <sys/mman.h>
+#include <signal.h>
+
+#include <spa/param/video/format-utils.h>
+#include <spa/param/props.h>
+
+#include <pipewire/pipewire.h>
+
+struct data {
+	struct pw_main_loop *loop;
+
+	struct pw_core *core;
+
+	struct pw_remote *remote;
+	struct spa_hook remote_listener;
+
+	struct pw_device *device;
+	const char *library;
+	const char *factory;
+	const char *path;
+};
+
+static int make_device(struct data *data)
+{
+	struct pw_factory *factory;
+	struct pw_properties *props;
+
+        factory = pw_core_find_factory(data->core, "spa-device-factory");
+	if (factory == NULL)
+		return -1;
+
+        props = pw_properties_new("spa.library.name", data->library,
+                                  "spa.factory.name", data->factory, NULL);
+
+	data->device = pw_factory_create_object(factory,
+					      NULL,
+					      PW_TYPE_INTERFACE_Device,
+					      PW_VERSION_DEVICE_PROXY,
+					      props, SPA_ID_INVALID);
+
+	pw_remote_export(data->remote, SPA_TYPE_INTERFACE_Device, NULL,
+			pw_device_get_implementation(data->device));
+
+	return 0;
+}
+
+static void on_state_changed(void *_data, enum pw_remote_state old, enum pw_remote_state state, const char *error)
+{
+	struct data *data = _data;
+
+	switch (state) {
+	case PW_REMOTE_STATE_ERROR:
+		printf("remote error: %s\n", error);
+		pw_main_loop_quit(data->loop);
+		break;
+
+	case PW_REMOTE_STATE_CONNECTED:
+		printf("remote state: \"%s\"\n", pw_remote_state_as_string(state));
+		if (make_device(data) < 0) {
+			pw_log_error("can't make device");
+			pw_main_loop_quit(data->loop);
+		}
+		break;
+
+	default:
+		printf("remote state: \"%s\"\n", pw_remote_state_as_string(state));
+		break;
+	}
+}
+
+static const struct pw_remote_events remote_events = {
+	PW_VERSION_REMOTE_EVENTS,
+	.state_changed = on_state_changed,
+};
+
+static void do_quit(void *data, int signal_number)
+{
+        struct data *d = data;
+	pw_main_loop_quit(d->loop);
+}
+
+int main(int argc, char *argv[])
+{
+	struct data data = { 0, };
+	struct pw_loop *l;
+
+	pw_init(&argc, &argv);
+
+	if (argc < 3) {
+		fprintf(stderr, "usage: %s <library> <factory>\n\n"
+				"\texample: %s v4l2/libspa-v4l2 v4l2-device\n\n",
+				argv[0], argv[0]);
+		return -1;
+	}
+
+	data.loop = pw_main_loop_new(NULL);
+	l = pw_main_loop_get_loop(data.loop);
+        pw_loop_add_signal(l, SIGINT, do_quit, &data);
+        pw_loop_add_signal(l, SIGTERM, do_quit, &data);
+	data.core = pw_core_new(l, NULL, 0);
+        data.remote = pw_remote_new(data.core, NULL, 0);
+	data.library = argv[1];
+	data.factory = argv[2];
+
+	pw_module_load(data.core, "libpipewire-module-spa-device-factory", NULL, NULL, NULL, NULL);
+	pw_module_load(data.core, "libpipewire-module-client-device", NULL, NULL, NULL, NULL);
+
+	pw_remote_add_listener(data.remote, &data.remote_listener, &remote_events, &data);
+
+        pw_remote_connect(data.remote);
+
+	pw_main_loop_run(data.loop);
+
+	pw_core_destroy(data.core);
+	pw_main_loop_destroy(data.loop);
+
+	return 0;
+}