1 files changed, 120 insertions, 0 deletions
diff --git a/src/multiplexer.c b/src/multiplexer.c
new file mode 100644
index 0000000..151302d
--- /dev/null
+++ b/src/multiplexer.c
@@ -0,0 +1,120 @@
+/* Multiplxer plugin.
+ * Copyright 2005 Thorsten Wilms.
+ * Based on David Robillard's "Hz to AMS style V/Oct" plugin for the skeleton.
+ *
+ * This plugin 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 plugin 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
+ * 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
+ */
+
+#define _XOPEN_SOURCE 600 /* strdup */
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+
+#include <lv2/lv2plug.in/ns/lv2core/lv2.h>
+
+#define MUX_GATE_ID 4420
+
+#define MUX_NUM_PORTS 4
+
+/* Port Numbers */
+#define MUX_GATE     0
+#define MUX_OFF     1
+#define MUX_ON  2
+#define MUX_OUTPUT   3
+
+/* All state information for plugin */
+typedef struct
+{
+	/* Ports */
+	float* gate_buffer;
+	float* off_buffer;
+	float* on_buffer;
+        float* output_buffer;
+} MUX;
+
+/* Construct a new plugin instance */
+static LV2_Handle
+instantiate(const LV2_Descriptor*     descriptor,
+            double                    sample_rate,
+            const char*               bundle_path,
+            const LV2_Feature* const* features)
+{
+	return (LV2_Handle)malloc(sizeof(MUX));
+}
+
+/* Connect a port to a data location */
+static void
+connect_port(LV2_Handle instance,
+             uint32_t   port,
+             void*      data)
+{
+	MUX* plugin;
+
+	plugin = (MUX*)instance;
+	switch (port) {
+	case MUX_GATE:
+		plugin->gate_buffer = (float*)data;
+		break;
+        case MUX_OFF:
+		plugin->off_buffer = (float*)data;
+		break;
+        case MUX_ON:
+		plugin->on_buffer = (float*)data;
+		break;
+	case MUX_OUTPUT:
+		plugin->output_buffer = (float*)data;
+		break;
+	}
+}
+
+static void
+run(LV2_Handle instance, uint32_t nframes)
+{
+	const MUX* const         plugin = (MUX*)instance;
+	const float* const gate   = plugin->gate_buffer;
+	const float* const off    = plugin->off_buffer;
+	const float* const on     = plugin->on_buffer;
+	float* const       output = plugin->output_buffer;
+	unsigned long i;
+
+	for (i = 0; i < nframes; i++)
+		output[i] = (gate[i] <= 0) ? off[i] : on[i];
+}
+
+static void
+cleanup(LV2_Handle instance)
+{
+	free(instance);
+}
+
+static const LV2_Descriptor descriptor = {
+	"http://drobilla.net/plugins/omins/multiplexer",
+	instantiate,
+	connect_port,
+	NULL,
+	run,
+	NULL,
+	cleanup,
+	NULL,
+};
+
+LV2_SYMBOL_EXPORT const LV2_Descriptor*
+lv2_descriptor(uint32_t index)
+{
+	switch (index) {
+	case 0:  return &descriptor;
+	default: return NULL;
+	}
+}