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-rw-r--r--midi.c106
1 files changed, 105 insertions, 1 deletions
diff --git a/midi.c b/midi.c
index c817bd2..a59ebeb 100644
--- a/midi.c
+++ b/midi.c
@@ -1,3 +1,107 @@
-int midi_start(){
+#include <string.h>
+#include <alsa/asoundlib.h>
+#include "midi.h"
+
+#define BACKEND_NAME "midi"
+static snd_seq_t* sequencer = NULL;
+
+int midi_init(){
+ backend midi = {
+ .name = BACKEND_NAME,
+ .conf = midi_configure,
+ .create = midi_instance,
+ .conf_instance = midi_configure_instance,
+ .channel = midi_channel,
+ .handle = midi_set,
+ .process = midi_handle,
+ .shutdown = midi_shutdown
+ };
+
+ if(snd_seq_open(&sequencer, "default", SND_SEQ_OPEN_DUPLEX, 0) < 0){
+ fprintf(stderr, "Failed to open ALSA sequencer\n");
+ return 1;
+ }
+
+ //register backend
+ if(mm_backend_register(midi)){
+ fprintf(stderr, "Failed to register MIDI backend\n");
+ return 1;
+ }
+ return 0;
+}
+
+static int midi_configure(char* option, char* value){
+ if(!strcmp(option, "name")){
+ if(snd_seq_set_client_name(sequencer, value) < 0){
+ fprintf(stderr, "Failed to set MIDI client name to %s\n", value);
+ return 1;
+ }
+ return 0;
+ }
+
+ fprintf(stderr, "Unknown MIDI backend option %s\n", option);
+ return 1;
+}
+
+static instance* midi_instance(){
+ return mm_instance();
+}
+
+static int midi_configure_instance(instance* instance, char* option, char* value){
+ if(!strcmp(option, "device")){
+ //open i/o device
+ return 0;
+ }
+ else if(!strcmp(option, "port")){
+ //create midi port
+ return 0;
+ }
+ else if(!strcmp(option, "mode")){
+ //configure open mode
+ //FIXME needed?
+ return 0;
+ }
+
+ fprintf(stderr, "Unknown MIDI instance option %s\n", option);
+ return 1;
+}
+
+static channel* midi_channel(instance* instance, char* spec){
+ fprintf(stderr, "Parsing MIDI channelspec %s\n", spec);
+ //TODO
+ return NULL;
+}
+
+static int midi_set(size_t num, channel* c, channel_value* v){
+ //TODO
return 1;
}
+
+static int midi_handle(size_t num, int* fd, void** data){
+ //TODO
+ return 1;
+}
+
+static int midi_shutdown(){
+ size_t n, p;
+ instance** inst = NULL;
+ if(mm_backend_instances(BACKEND_NAME, &n, &inst)){
+ fprintf(stderr, "Failed to fetch instance list\n");
+ return 1;
+ }
+
+ for(p = 0; p < n; p++){
+ free(inst[p]->impl);
+ }
+ free(inst);
+
+ //close midi
+ snd_seq_close(sequencer);
+ sequencer = NULL;
+
+ //free configuration cache
+ snd_config_update_free_global();
+
+ fprintf(stderr, "MIDI backend shut down\n");
+ return 0;
+}