media-session: make the services more modular

src/examples/media-session/alsa-midi.c

@@ -0,0 +1,89 @@
+/* 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 <string.h>
+#include <stdio.h>
+#include <errno.h>
+#include <math.h>
+#include <time.h>
+
+#include "config.h"
+
+#include <spa/utils/names.h>
+#include <spa/node/keys.h>
+
+#include "pipewire/pipewire.h"
+
+#include "media-session.h"
+
+struct impl {
+	struct sm_media_session *session;
+
+	struct pw_properties *props;
+	struct pw_proxy *proxy;
+};
+
+void * sm_alsa_midi_start(struct sm_media_session *session)
+{
+	struct impl *impl;
+
+	impl = calloc(1, sizeof(struct impl));
+	if (impl == NULL)
+		return NULL;
+
+	impl->session = session;
+	impl->props = pw_properties_new(
+			SPA_KEY_FACTORY_NAME, SPA_NAME_API_ALSA_SEQ_BRIDGE,
+			SPA_KEY_NODE_NAME, "Midi-Bridge",
+			NULL);
+	if (impl->props == NULL)
+		goto cleanup;
+
+	impl->proxy = sm_media_session_create_object(session,
+				"spa-node-factory",
+				PW_TYPE_INTERFACE_Node,
+				PW_VERSION_NODE_PROXY,
+				&impl->props->dict,
+                                0);
+
+	if (impl->proxy == NULL)
+		goto cleanup_props;
+
+	return impl;
+
+cleanup_props:
+	pw_properties_free(impl->props);
+cleanup:
+	free(impl);
+	return NULL;
+}
+
+int sm_alsa_midi_stop(void *data)
+{
+	struct impl *impl = data;
+	pw_proxy_destroy(impl->proxy);
+	pw_properties_free(impl->props);
+	free(impl);
+	return 0;
+}