Move omins to plugins directory.

git-svn-id: http://svn.drobilla.net/lad/trunk/plugins/omins.lv2@4725 a436a847-0d15-0410-975c-d299462d15a1

1 files changed, 138 insertions, 0 deletions

diff --git a/src/fast_crossfade.c b/src/fast_crossfade.c
new file mode 100644
index 0000000..228efb4
--- /dev/null
+++ b/src/fast_crossfade.c
@@ -0,0 +1,138 @@
+/* Crossfade with AR Level plugin.
+ * Copyright 2005 Thorsten Wilms.
+ *
+ * Based on David Robillard's "Hz to AMS style V/Oct" plugin for the skeleton.
+ * Thanks to Florian Schmidt for explaining how to calculate the scale values
+ * before I could work it out myself! ;-)
+ *
+ * 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 <lv2/lv2plug.in/ns/lv2core/lv2.h>
+
+#define XFADE_LEVEL_ID 4410
+
+#define XFADE_NUM_PORTS 4
+
+/* Port Numbers */
+#define XFADE_LEVEL  0
+#define XFADE_A      1
+#define XFADE_B      2
+#define XFADE_OUTPUT 3
+
+/* All state information for plugin */
+typedef struct {
+	/* Ports */
+	float *level_buffer;
+	float *a_buffer;
+	float *b_buffer;
+	float *output_buffer;
+} XFADE;
+
+/* 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(XFADE));
+}
+
+/* Connect a port to a data location */
+static void
+connect_port(LV2_Handle instance,
+				   uint32_t port, void* location)
+{
+	XFADE* plugin;
+
+	plugin = (XFADE*) instance;
+	switch (port) {
+	case XFADE_LEVEL:
+		plugin->level_buffer = location;
+		break;
+	case XFADE_A:
+		plugin->a_buffer = location;
+		break;
+	case XFADE_B:
+		plugin->b_buffer = location;
+		break;
+	case XFADE_OUTPUT:
+		plugin->output_buffer = location;
+		break;
+	}
+}
+
+static void
+run(LV2_Handle instance, uint32_t nframes)
+{
+	float*  level;
+	float*  a;
+	float*  b;
+	float*  output;
+	XFADE*        plugin;
+	unsigned long i;
+	float         l;
+
+	plugin = (XFADE*)instance;
+
+	level  = plugin->level_buffer;
+	a      = plugin->a_buffer;
+	b      = plugin->b_buffer;
+	output = plugin->output_buffer;
+
+	for (i = 0; i < nframes; i++) {
+		/* transfer multiplication value to 0 to 1 range */
+		if (level[i] < -1) {
+			l = 0;
+		} else if (level[i] > 1) {
+			l = 1;
+		} else {
+			l = (level[i] + 1) / 2;
+		}
+
+		output[i] = a[i] * l + b[i] * (1 - l);
+	}
+}
+
+static void
+cleanup(LV2_Handle instance)
+{
+	free(instance);
+}
+
+static const LV2_Descriptor descriptor = {
+	"http://drobilla.net/plugins/omins/fast_crossfade",
+	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;
+	}
+}