Implement an OLA backend (Fixes #14)

1 files changed, 38 insertions, 0 deletions

diff --git a/backends/ola.h b/backends/ola.h
new file mode 100644
index 0000000..c943d52
--- /dev/null
+++ b/backends/ola.h
@@ -0,0 +1,38 @@
+extern "C" {
+	#include "midimonster.h"
+	//C++ has it's own implementation of these...
+	#undef min
+	#undef max
+
+	int init();
+	static int ola_configure(char* option, char* value);
+	static int ola_configure_instance(instance* instance, char* option, char* value);
+	static instance* ola_instance();
+	static channel* ola_channel(instance* instance, char* spec);
+	static int ola_set(instance* inst, size_t num, channel** c, channel_value* v);
+	static int ola_handle(size_t num, managed_fd* fds);
+	static int ola_start();
+	static int ola_shutdown();
+}
+
+#define MAP_COARSE 0x0200
+#define MAP_FINE 0x0400
+#define MAP_SINGLE 0x0800
+#define MAP_MARK 0x1000
+#define MAPPED_CHANNEL(a) ((a) & 0x01FF)
+#define IS_ACTIVE(a) ((a) & 0xFE00)
+#define IS_WIDE(a) ((a) & (MAP_FINE | MAP_COARSE))
+#define IS_SINGLE(a) ((a) & MAP_SINGLE)
+
+//since ola seems to immediately loop back any sent data as input, we only use one buffer
+//to avoid excessive event feedback loops
+typedef struct /*_ola_universe_model*/ {
+	uint8_t data[512];
+	uint16_t map[512];
+} ola_universe;
+
+typedef struct /*_ola_instance_model*/ {
+	/*TODO does ola support remote connections?*/
+	unsigned int universe_id;
+	ola_universe data;
+} ola_instance_data;