1 files changed, 82 insertions, 0 deletions
diff --git a/ns/ext/contexts/contexts.h b/ns/ext/contexts/contexts.h
new file mode 100644
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+++ b/ns/ext/contexts/contexts.h
@@ -0,0 +1,82 @@
+/* LV2 Contexts Extension
+ * Copyright (C) 2007-2009 David Robillard <http://drobilla.net>
+ *
+ * This header is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This header is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/** @file
+ * C header for the LV2 Contexts extension
+ * <http://lv2plug.in/ns/ext/contexts>.
+ */
+
+#ifndef LV2_CONTEXTS_H
+#define LV2_CONTEXTS_H
+
+#include <stdint.h>
+
+#include "lv2/lv2plug.in/ns/lv2core/lv2.h"
+
+#define LV2_CONTEXTS_URI "http://lv2plug.in/ns/ext/contexts"
+
+static inline void
+lv2_contexts_set_port_valid(void* flags, uint32_t index) {
+	((uint8_t*)flags)[index / 8] |= 1 << (index % 8);
+}
+
+static inline void
+lv2_contexts_unset_port_valid(void* flags, uint32_t index) {
+	((uint8_t*)flags)[index / 8] &= ~(1 << (index % 8));
+}
+
+static inline int
+lv2_contexts_port_is_valid(const void* flags, uint32_t index) {
+	return (((uint8_t*)flags)[index / 8] & (1 << (index % 8))) != 0;
+}
+
+typedef struct {
+
+	/** The message run function.  This is called once to process a set of
+	 * inputs and produce a set of outputs.
+	 *
+	 * Before calling the host MUST set valid_inputs such that the bit
+	 * corresponding to each input port is 1 iff data is present. The plugin
+	 * MUST only inspect bits corresponding to ports in the message thread.
+	 *
+	 * Similarly, before returning the plugin MUST set valid_outputs such that
+	 * the bit corresponding to each output port of the message context is 1
+	 * iff the value at that port has changed.
+	 * The plugin must return 1 if outputs have been written, 0 otherwise.
+	 */
+	uint32_t (*run)(LV2_Handle  instance,
+	                const void* valid_inputs,
+	                void*       valid_outputs);
+
+} LV2_Contexts_MessageContext;
+
+typedef void* LV2_Contexts_Request_Run_Data;
+
+typedef struct {
+
+	/** Pointer to opaque host data (to be passed to request_run) */
+	LV2_Contexts_Request_Run_Data data;
+
+	/** Request the host execute the context with the given URI */
+	void (*request_run)(LV2_Contexts_Request_Run_Data host_handle,
+	                    uint32_t                      context_uri);
+
+} LV2_Contexts_Request_Run_Feature;
+
+#endif /* LV2_CONTEXTS_H */
+