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hdjd
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Making progress on bidirectional communication

This commit is contained in:
Neale Pickett 2013-05-13 22:53:35 -06:00
parent f4717adcb4
commit 46e3d5ce71
1 changed files with 72 additions and 16 deletions
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88
hdjd.c
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@ -71,6 +71,30 @@ usb_xfer_done(struct libusb_transfer *transfer)
midi_send(data, datalen);
}
void
handle_alsa()
{
snd_midi_event_t *midi_event_parser;
snd_seq_event_t *ev;
int ret = 1;
for (ret = 1; ret > 0; ) {
char buf[512];
long converted;
int i;
ret = snd_seq_event_input(handle, &ev);
snd_midi_event_new(512, &midi_event_parser);
converted = snd_midi_event_decode(midi_event_parser, buf, 512, ev);
printf(" << ");
for (i = 0; i < converted; i += 1) {
printf("%02x ", buf[i]);
}
printf("\n");
snd_midi_event_free(midi_event_parser);
}
}
int
main(int argc, char **argv)
{
@ -147,31 +171,55 @@ main(int argc, char **argv)
// Select on our file descriptors
{
const struct libusb_pollfd **usb_fds = libusb_get_pollfds(NULL);
struct pollfd *pfd;
int npfd;
struct timeval tv;
struct timeval *timeout;
fd_set rfds, wfds;
int nfds = 0;
ret = libusb_get_next_timeout(NULL, &tv);
if (0 == ret) {
timeout = NULL;
} else {
timeout = &tv;
}
FD_ZERO(&rfds);
FD_ZERO(&wfds);
for (i = 0; usb_fds[i]; i += 1) {
const struct libusb_pollfd *ufd = usb_fds[i];
// ALSA shit
{
npfd = snd_seq_poll_descriptors_count(handle, POLLIN);
pfd = (struct pollfd *)alloca(npfd * sizeof(struct pollfd));
snd_seq_poll_descriptors(handle, pfd, npfd, POLLIN);
for (i = 0; i < npfd; i += 1) {
if (pfd[i].fd > nfds) {
nfds = pfd[i].fd;
}
if (pfd[i].events & POLLIN) {
FD_SET(pfd[i].fd, &rfds);
}
}
}
// USB shit
{
if (ufd->fd > nfds) {
nfds = ufd->fd;
ret = libusb_get_next_timeout(NULL, &tv);
if (0 == ret) {
timeout = NULL;
} else {
timeout = &tv;
}
if (ufd->events & POLLIN) {
FD_SET(ufd->fd, &rfds);
}
if (ufd->events & POLLOUT) {
FD_SET(ufd->fd, &wfds);
for (i = 0; usb_fds[i]; i += 1) {
const struct libusb_pollfd *ufd = usb_fds[i];
if (ufd->fd > nfds) {
nfds = ufd->fd;
}
if (ufd->events & POLLIN) {
FD_SET(ufd->fd, &rfds);
}
if (ufd->events & POLLOUT) {
FD_SET(ufd->fd, &wfds);
}
}
}
@ -184,6 +232,14 @@ main(int argc, char **argv)
libusb_handle_events(NULL);
}
}
for (i = 0; i < npfd; i += 1) {
int fd = pfd[i].fd;
if (FD_ISSET(fd, &rfds)) {
handle_alsa();
}
}
}
libusb_free_transfer(xfer);