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#include "MIDI.h"
MIDI::MIDI():
seq_handle{},
in_port{},
npfd{},
pfd{},
midi_event_parser{}
{
if (0 > snd_seq_open(&seq_handle, "default", SND_SEQ_OPEN_INPUT, SND_SEQ_NONBLOCK))
{
throw std::runtime_error("MIDI sequencer couldn't be opened");
}
if (0 > snd_seq_set_client_name(seq_handle, "Midi Listener"))
{
throw std::runtime_error("MIDI client name couldn't be set");
}
if (0 > ((in_port = snd_seq_create_simple_port(seq_handle, "24:0",
SND_SEQ_PORT_CAP_WRITE | SND_SEQ_PORT_CAP_SUBS_WRITE | SND_SEQ_PORT_CAP_READ | SND_SEQ_PORT_CAP_SUBS_READ,
SND_SEQ_PORT_TYPE_APPLICATION))))
{
throw std::runtime_error("MIDI port couldn't be opened");
}
debug_cout << "in_port: " << std::to_string(in_port) << std::endl;
if (1) {
snd_seq_addr_t sender, dest;
snd_seq_port_subscribe_t *subs;
sender.client = 24;
sender.port = 0;
dest.client = snd_seq_client_id(seq_handle);
dest.port = in_port;
snd_seq_port_subscribe_alloca(&subs);
snd_seq_port_subscribe_set_sender(subs, &sender);
snd_seq_port_subscribe_set_dest(subs, &dest);
snd_seq_port_subscribe_set_queue(subs, 1);
snd_seq_port_subscribe_set_time_update(subs, 1);
snd_seq_port_subscribe_set_time_real(subs, 1);
// TODO: fix timestamp (currently always 0)
if (0 > snd_seq_subscribe_port(seq_handle, subs))
{
throw std::runtime_error("MIDI port couldn't be connected");
}
} else {
if (0 > snd_seq_connect_from(seq_handle, in_port, 24, 0))
{
throw std::runtime_error("MIDI port couldn't be connected");
}
}
npfd = snd_seq_poll_descriptors_count(seq_handle, POLLIN);
if (npfd < 0) {
throw std::runtime_error("snd_seq_poll_descriptors_count() failed");
}
pfd = (struct pollfd *)malloc(npfd * sizeof(struct pollfd));
if (pfd == nullptr) {
throw std::runtime_error("alloca() error for MIDI");
}
if (0 > snd_seq_poll_descriptors(seq_handle, pfd, npfd, POLLIN))
{
throw std::runtime_error("snd_seq_poll_descriptors() failure");
}
if (npfd != 1) {
std::cout << "Warning: " << std::to_string(npfd) << " poll fds for MIDI" << std::endl;
} else if (fd() <= 2) {
std::cout << "Warning: Bad MIDI fd: " << std::to_string(fd()) << std::endl;
}
if (0 > snd_midi_event_new(1024, &midi_event_parser)) {
throw std::runtime_error("snd_midi_event_new()");
}
}
MIDI::~MIDI()
{
snd_midi_event_free(midi_event_parser);
free(pfd);
}
int MIDI::fd()
{
return pfd->fd;
}
bool MIDI::event_ready()
{
int result = snd_seq_event_input_pending(seq_handle, 1);
if (result < 0) {
throw std::runtime_error("snd_seq_event_input_pending() failed");
}
return result > 0;
}
snd_seq_event_t* MIDI::read(void)
{
snd_seq_event_t *ev = NULL;
if (0 > snd_seq_event_input(seq_handle, &ev))
{
std::cerr << "snd_seq_event_input(): -EAGAIN" << std::endl;
}
return ev;
}
namespace {
uint64_t timestamp_from_event(const snd_seq_event_t *ev)
{
return ((ev->flags & SND_SEQ_TIME_STAMP_MASK) == SND_SEQ_TIME_STAMP_REAL) ? ev->time.time.tv_sec : ev->time.tick;
}
}
// returns if click starts
void MIDI::process(snd_seq_event_t *ev)
{
uint64_t timestamp = timestamp_from_event(ev); // original timestamp
// TODO: fix timestamp to be set automatically
struct timespec t;
if (TIME_UTC != timespec_get(&t, TIME_UTC))
{
log_cout << "Error: timespec_get()" << std::endl;
}
else
{
ev->time.time.tv_sec = t.tv_sec;
ev->time.time.tv_nsec = t.tv_nsec;
}
if ((ev->type == SND_SEQ_EVENT_NOTEON) ||(ev->type == SND_SEQ_EVENT_NOTEOFF)) {
const char *type = (ev->type == SND_SEQ_EVENT_NOTEON) ? "on " : "off";
debug_cout << fmt::format("[{}] Note {}: {:2x} vel({:2x}), ch {:2x}\n", timestamp,
type,
ev->data.note.note,
ev->data.note.velocity,
ev->data.control.channel);
if (ev->type == SND_SEQ_EVENT_NOTEON) {
signal_note(ev->data.control.channel, ev->data.note.note, timestamp);
}
}
else if (ev->type == SND_SEQ_EVENT_CONTROLLER)
{
debug_cout << fmt::format("[{}] Control: {:2x} val({:2x})\n", timestamp_from_event(ev),
ev->data.control.param,
ev->data.control.value);
}
else if (ev->type == SND_SEQ_EVENT_SENSING)
{
signal_active_sensing();
debug_cout << fmt::format("[{}] Active Sensing", timestamp_from_event(ev)) << std::endl;
}
else if (ev->type == SND_SEQ_EVENT_CLOCK)
{
signal_clock();
debug_cout << fmt::format("[{}] Clock\n", timestamp_from_event(ev)) << std::endl;
}
else
{
log_cout << fmt::format("[{}] Unknown MIDI event: {}", timestamp_from_event(ev), ev->type) << std::endl;
}
unsigned char buf[1024]; // dummy
long midi_bytes {snd_midi_event_decode(midi_event_parser, buf, sizeof(buf), ev)};
signal_count_events(midi_bytes);
}
void MIDI::flush()
{
while (event_ready()) {
(void) read();
}
}
void MIDI::wait_for_event()
{
int result = poll(pfd, npfd, 10000);
if (result > 0)
{
// event
}
else if (result == 0) {
// timeout
} else {
throw std::runtime_error("Poll unsuccessful");
}
}
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