1 files changed, 124 insertions, 0 deletions
diff --git a/src/signal_abs.c b/src/signal_abs.c
new file mode 100644
index 0000000..a81b282
--- /dev/null
+++ b/src/signal_abs.c
@@ -0,0 +1,124 @@
+/* Absolute value audio plugin.
+ * Copyright 2005 Loki Davison.
+ *
+ * Sign parameter is the sign of the output, 0 being negative and >0 begin positive.
+ *
+ * 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 500 /* strdup */
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+
+#include <lv2/lv2plug.in/ns/lv2core/lv2.h>
+
+#define SIGNAL_ABS_BASE_ID 2669
+
+#define SIGNAL_ABS_NUM_PORTS 3
+
+/* Port Numbers */
+#define SIGNAL_ABS_INPUT1   0
+#define SIGNAL_ABS_SIGN  1
+#define SIGNAL_ABS_OUTPUT  2
+
+/* All state information for plugin */
+typedef struct
+{
+	/* Ports */
+	float* sign;
+	float* input1;
+	float* output;
+} SignalAbs;
+
+/* 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(SignalAbs));
+}
+
+/* Connect a port to a data location */
+static void
+connect_port(LV2_Handle instance,
+             uint32_t port,
+             void*  location)
+{
+	SignalAbs* plugin;
+
+	plugin = (SignalAbs*)instance;
+	switch (port) {
+	case SIGNAL_ABS_SIGN:
+		plugin->sign = location;
+		break;
+	case SIGNAL_ABS_INPUT1:
+		plugin->input1 = location;
+		break;
+	case SIGNAL_ABS_OUTPUT:
+		plugin->output = location;
+		break;
+	}
+}
+
+static void
+run_ar(LV2_Handle instance, uint32_t nframes)
+{
+	SignalAbs*  plugin  = (SignalAbs*)instance;
+	float* sign  = plugin->sign;
+	float* input1   = plugin->input1;
+	float* output  = plugin->output;
+	size_t i;
+
+	for (i = 0; i < nframes; ++i)
+	{
+    	    if(sign[i] > 0.5)
+	    {
+		output[i] = fabs(input1[i]);
+	    }
+	     else
+	    {
+		output[i] = fabs(input1[i]) * -1;
+	    }
+	}
+}
+
+static void
+cleanup(LV2_Handle instance)
+{
+	free(instance);
+}
+
+static const LV2_Descriptor descriptor = {
+	"http://drobilla.net/plugins/omins/signal_abs",
+	instantiate,
+	connect_port,
+	NULL,
+	run_ar,
+	NULL,
+	cleanup,
+	NULL,
+};
+
+LV2_SYMBOL_EXPORT const LV2_Descriptor*
+lv2_descriptor(uint32_t index)
+{
+	switch (index) {
+	case 0:  return &descriptor;
+	default: return NULL;
+	}
+}