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#include <alsa/asoundlib.h>
#include <arpa/inet.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
#include "midimcast.h"
bool midimcast_debug;
int snd_rawmidi_virtual_open(snd_rawmidi_t **inputp,
snd_rawmidi_t **outputp,
const char *name,
snd_seq_t *seq_handle,
int port,
int merge,
int mode);
static void env_read_server(const char **const midi_in)
{
*midi_in = getenv("MIDI_IN");
if (!*midi_in)
err("`MIDI_IN` unset");
debug("Using MIDI input %s", *midi_in);
}
// TODO: Debug messages
// TODO: Const stuff
static void midi_open(const char *const midi_in,
snd_seq_t **seq,
snd_rawmidi_t **input)
{
err_snd(snd_seq_open, seq, "default", SND_SEQ_OPEN_INPUT, 0);
err_snd(snd_seq_set_client_name, *seq, "MIDI Broadcaster");
const int port = snd_seq_create_simple_port(*seq,
"MIDI Broadcaster Input",
SND_SEQ_PORT_CAP_WRITE
| SND_SEQ_PORT_CAP_SYNC_WRITE
| SND_SEQ_PORT_CAP_SUBS_WRITE,
SND_SEQ_PORT_TYPE_MIDI_GENERIC);
err_snd(snd_rawmidi_virtual_open,
input,
NULL,
"MIDI Broadcaster",
*seq,
port,
true,
SND_RAWMIDI_READ_STANDARD);
snd_seq_client_info_t *client_info;
snd_seq_client_info_alloca(&client_info);
snd_seq_client_info_set_client(client_info, -1);
snd_seq_addr_t src, dst;
for (;;) {
if (snd_seq_query_next_client(*seq, client_info))
err("Input '%s' absent", midi_in);
if (strcmp(snd_seq_client_info_get_name(client_info), midi_in) == 0) {
src.client = snd_seq_client_info_get_client(client_info);
snd_seq_port_info_t *port_info;
snd_seq_port_info_alloca(&port_info);
snd_seq_port_info_set_client(port_info, src.client);
snd_seq_port_info_set_port(port_info, -1);
if (snd_seq_query_next_port(*seq, port_info))
err("Input '%s' has no ports", midi_in);
src.port = snd_seq_port_info_get_port(port_info);
break;
}
}
dst.client = snd_seq_client_id(*seq);
dst.port = port;
snd_seq_port_subscribe_t *sub;
snd_seq_port_subscribe_alloca(&sub);
snd_seq_port_subscribe_set_sender(sub, &src);
snd_seq_port_subscribe_set_dest(sub, &dst);
err_snd(snd_seq_subscribe_port, *seq, sub);
}
// TODO: Naming
static int sock_init(struct sockaddr_in *addr,
const char *const mcast_group,
const uint16_t mcast_port)
{
memset(addr, 0, sizeof(*addr));
addr->sin_family = AF_INET;
addr->sin_addr.s_addr = inet_addr(mcast_group);
addr->sin_port = htons(mcast_port);
return err_std_neg(socket, AF_INET, SOCK_DGRAM, 0);
}
static void msg_write(struct msg *const msg,
const size_t midi_size,
const int out_sock,
struct sockaddr_in *addr)
{
msg->ts = htole64(msg->ts);
const size_t header_size = (void *)&msg->midi - (void *)&msg->ts;
const size_t msg_size = header_size + midi_size;
err_std_neg(sendto,
out_sock,
msg,
msg_size,
0,
(struct sockaddr *)addr,
sizeof(*addr));
// TODO: Check enough written?
}
int main()
{
const char *mcast_group;
uint16_t mcast_port;
const char *midi_in;
env_read_common(&mcast_group, &mcast_port);
env_read_server(&midi_in);
snd_seq_t *seq;
snd_rawmidi_t *input;
midi_open(midi_in, &seq, &input);
struct sockaddr_in addr;
const int sock = sock_init(&addr, mcast_group, mcast_port);
for (;;) {
struct msg msg;
ssize_t nread = err_snd_neg(snd_rawmidi_read,
input,
&msg.midi,
sizeof(msg.midi));
debug("Read %ld bytes", nread);
msg.ts = now();
msg_write(&msg, nread, sock, &addr);
}
// TODO: Make these run
err_snd(snd_rawmidi_close, input);
err_snd(snd_seq_close, seq);
err_std(close, sock);
return EXIT_SUCCESS;
}
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