tools: add pw-reserve to reverse and monitor a device

src/examples/media-session/pw-reserve.c

@@ -0,0 +1,216 @@
+/* PipeWire
+ *
+ * Copyright © 2020 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 "config.h"
+
+#include <getopt.h>
+#include <signal.h>
+
+#include <dbus/dbus.h>
+
+#include <spa/support/dbus.h>
+
+#include "pipewire/pipewire.h"
+
+#include "reserve.c"
+
+#define NAME "reserve"
+
+struct impl {
+	struct pw_main_loop *mainloop;
+	struct pw_loop *loop;
+	struct pw_context *context;
+
+	struct spa_dbus *dbus;
+	struct spa_dbus_connection *dbus_connection;
+	DBusConnection *conn;
+
+	struct rd_device *device;
+};
+
+static void reserve_acquired(void *data, struct rd_device *d)
+{
+	fprintf(stdout, "reserve acquired\n");
+}
+
+static void reserve_release(void *data, struct rd_device *d, int forced)
+{
+	struct impl *impl = data;
+	fprintf(stdout, "reserve release\n");
+	rd_device_complete_release(impl->device, true);
+}
+
+static void reserve_busy(void *data, struct rd_device *d, const char *name, int32_t prio)
+{
+	fprintf(stdout, "reserve busy %s, prio %d\n", name, prio);
+}
+
+static void reserve_available(void *data, struct rd_device *d, const char *name)
+{
+	fprintf(stdout, "reserve available %s\n", name);
+}
+
+static const struct rd_device_callbacks reserve_callbacks = {
+	.acquired = reserve_acquired,
+	.release = reserve_release,
+	.busy = reserve_busy,
+	.available = reserve_available,
+};
+
+static void do_quit(void *data, int signal_number)
+{
+	struct impl *impl = data;
+	pw_main_loop_quit(impl->mainloop);
+}
+
+#define DEFAULT_APPNAME		"pw-reserve"
+#define DEFAULT_PRIORITY	0
+
+static void show_help(const char *name)
+{
+        fprintf(stdout, "%s [options]\n"
+             "  -h, --help                            Show this help\n"
+             "      --version                         Show version\n"
+             "  -n, --name                            Name to reserve (Audio0, Midi0, Video0, ..)\n"
+             "  -a, --appname                         Application Name (default %s)\n"
+             "  -p, --priority                        Priority (default %d)\n"
+             "  -m, --monitor                         Monitor only, don't try to acquire\n",
+	     name, DEFAULT_APPNAME, DEFAULT_PRIORITY);
+}
+
+int main(int argc, char *argv[])
+{
+	struct impl impl = { 0, };
+	const struct spa_support *support;
+	uint32_t n_support;
+	const char *opt_name = NULL;
+	const char *opt_appname = DEFAULT_APPNAME;
+	bool opt_monitor = false;
+	int opt_priority= DEFAULT_PRIORITY;
+
+	int res = 0, c;
+	static const struct option long_options[] = {
+		{ "help",	no_argument,		NULL, 'h' },
+		{ "version",	no_argument,		NULL, 'V' },
+		{ "name",	required_argument,	NULL, 'n' },
+		{ "app",	required_argument,	NULL, 'a' },
+		{ "priority",	required_argument,	NULL, 'p' },
+		{ "monitor",	no_argument,		NULL, 'm' },
+		{ NULL, 0, NULL, 0}
+	};
+
+	pw_init(&argc, &argv);
+
+	while ((c = getopt_long(argc, argv, "hVn:a:p:m", long_options, NULL)) != -1) {
+		switch (c) {
+		case 'h':
+			show_help(argv[0]);
+			return 0;
+		case 'V':
+			fprintf(stdout, "%s\n"
+				"Compiled with libpipewire %s\n"
+				"Linked with libpipewire %s\n",
+				argv[0],
+				pw_get_headers_version(),
+				pw_get_library_version());
+			return 0;
+		case 'n':
+			opt_name = optarg;
+			break;
+		case 'a':
+			opt_appname = optarg;
+			break;
+		case 'p':
+			opt_priority = atoi(optarg);
+			break;
+		case 'm':
+			opt_monitor = true;
+			break;
+		default:
+			fprintf(stderr, "invalid option '%c'\n", c);
+			return -1;
+		}
+	}
+	if (opt_name == NULL) {
+		fprintf(stderr, "name must be given\n");
+		return -1;
+	}
+
+	impl.mainloop = pw_main_loop_new(NULL);
+	if (impl.mainloop == NULL) {
+		fprintf(stderr, "can't create mainloop: %m\n");
+		res = -errno;
+		goto exit;
+	}
+	impl.loop = pw_main_loop_get_loop(impl.mainloop);
+
+	pw_loop_add_signal(impl.loop, SIGINT, do_quit, &impl);
+	pw_loop_add_signal(impl.loop, SIGTERM, do_quit, &impl);
+
+	impl.context = pw_context_new(impl.loop, NULL, 0);
+	if (impl.context == NULL) {
+		fprintf(stderr, "can't create context: %m\n");
+		res = -errno;
+		goto exit;
+	}
+
+	support = pw_context_get_support(impl.context, &n_support);
+
+	impl.dbus = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_DBus);
+	if (impl.dbus)
+		impl.dbus_connection = spa_dbus_get_connection(impl.dbus, SPA_DBUS_TYPE_SESSION);
+	if (impl.dbus_connection == NULL) {
+		fprintf(stderr, "no dbus connection: %m\n");
+		res = -errno;
+		goto exit;
+	}
+	impl.conn = spa_dbus_connection_get(impl.dbus_connection);
+	if (impl.conn == NULL) {
+		fprintf(stderr, "no dbus connection: %m\n");
+		res = -errno;
+		goto exit;
+	}
+
+	impl.device = rd_device_new(impl.conn,
+			opt_name,
+			opt_appname,
+			opt_priority,
+			&reserve_callbacks, &impl);
+
+	if (!opt_monitor)
+		rd_device_acquire(impl.device);
+
+	pw_main_loop_run(impl.mainloop);
+
+	if (!opt_monitor)
+		rd_device_release(impl.device);
+
+exit:
+	pw_context_destroy(impl.context);
+	pw_main_loop_destroy(impl.mainloop);
+
+	pw_deinit();
+
+	return res;
+}

src/examples/meson.build

@@ -94,6 +94,13 @@ if alsa_dep.found()
 )
 endif
 
+executable('pw-reserve',
+	'media-session/pw-reserve.c',
+	c_args : [ '-D_GNU_SOURCE' ],
+	install: true,
+	dependencies : [dbus_dep, pipewire_dep],
+)
+
 executable('bluez-session',
   'bluez-session.c',
   c_args : [ '-D_GNU_SOURCE' ],