From 6a651aca0de7262e805ff8edb12cdc4692009997 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Sun, 19 Aug 2012 19:24:44 +0000
Subject: Move omins to plugins directory.

git-svn-id: http://svn.drobilla.net/lad/trunk/plugins/omins.lv2@4725 a436a847-0d15-0410-975c-d299462d15a1
---
 src/hz_voct.c | 119 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 src/hz_voct.c

(limited to 'src/hz_voct.c')

diff --git a/src/hz_voct.c b/src/hz_voct.c
new file mode 100644
index 0000000..2d1409f
--- /dev/null
+++ b/src/hz_voct.c
@@ -0,0 +1,119 @@
+/* Hz to AMS style V/Oct plugin.  Copyright 2005-2011 David Robillard.
+ *
+ * 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 HZVOCT_BASE_ID 4200
+
+#define HZVOCT_NUM_PORTS 2
+
+/* Port Numbers */
+#define HZVOCT_INPUT   0
+#define HZVOCT_OUTPUT  1
+
+/* All state information for plugin */
+typedef struct
+{
+	/* Ports */
+	float* input_buffer;
+	float* output_buffer;
+} HzVoct;
+
+/* 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)
+{
+	HzVoct* plugin = malloc(sizeof(HzVoct));
+	plugin->input_buffer = NULL;
+	plugin->output_buffer = NULL;
+	return (LV2_Handle)plugin;
+}
+
+/* Connect a port to a data location */
+static void
+connect_port(LV2_Handle instance,
+             uint32_t port,
+             void*  location)
+{
+	HzVoct* plugin;
+
+	plugin = (HzVoct*)instance;
+	switch (port) {
+	case HZVOCT_INPUT:
+		plugin->input_buffer = location;
+		break;
+	case HZVOCT_OUTPUT:
+		plugin->output_buffer = location;
+		break;
+	}
+}
+
+static void
+run(LV2_Handle instance, uint32_t nframes)
+{
+	float*  input;
+	float*  output;
+	HzVoct*       plugin;
+	unsigned long i;
+	float         log2inv;
+	float         eighth = 1.0f/8.0f;
+	const float   offset = 5.0313842; // + octave, ... -1, 0, 1 ...
+
+	plugin = (HzVoct*)instance;
+	log2inv = 1.0f/logf(2.0);
+
+	input = plugin->input_buffer;
+	output = plugin->output_buffer;
+
+	// Inverse of the formula used in AMS's converter module (except the 1/8 part)
+	for (i = 0; i < nframes; i++)
+		*output++ = logf((*input++) * eighth) * log2inv - offset;
+}
+
+static void
+cleanup(LV2_Handle instance)
+{
+	free(instance);
+}
+
+static const LV2_Descriptor descriptor = {
+	"http://drobilla.net/plugins/omins/hz_voct",
+	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;
+	}
+}
-- 
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