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/*
* dolmetschctl
*
*
* Copyright (C) 2015 Christian Pointner <equinox@spreadspace.org>
*
* This file is part of dolmetschctl.
*
* dolmetschctl is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* dolmetschctl is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with dolmetschctl. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stdio.h>
#include <error.h>
#include <poll.h>
#include <assert.h>
#include "midi.h"
int midi_init(midi_t* m, const char* device)
{
assert(m != NULL);
m->input_ = NULL;
memset(m->buf_, 0, sizeof(m->buf_));
m->read_idx_ = 0;
int ret = snd_rawmidi_open(&(m->input_), NULL, device, SND_RAWMIDI_NONBLOCK);
if(ret < 0) {
error(0, 0, "MIDI: cannot open port '%s': %s", device, snd_strerror(ret));
return ret;
}
return 0;
}
int midi_get_poll_fd_count(midi_t* m)
{
return snd_rawmidi_poll_descriptors_count(m->input_);
}
int midi_get_poll_fds(midi_t* m, struct pollfd *pfds, int npfds)
{
return snd_rawmidi_poll_descriptors(m->input_, pfds, npfds);
}
static int midi_handle_message(midi_t* m, mixer_t* x)
{
int i;
printf("MIDI: ");
for (i = 0; i < sizeof(m->buf_); ++i)
printf("%02X%c", m->buf_[i], (i >= (sizeof(m->buf_)-1)) ? '\n' : ' ');
return 0;
}
int midi_handle_revents(midi_t* m, struct pollfd *pfds, int npfds, mixer_t* x)
{
int err;
unsigned short revents;
if((err = snd_rawmidi_poll_descriptors_revents(m->input_, pfds, npfds, &revents)) < 0) {
error(0, 0, "MIDI: cannot get poll events: %s", snd_strerror(errno));
return -1;
}
if(pfds[0].revents & (POLLERR | POLLHUP | POLLNVAL)) {
error(0, 0, "MIDI: got POLLERR, POLLHUP or POLLNVAL");
return -1;
}
if(!(revents & POLLIN))
return 0;
int ret = snd_rawmidi_read(m->input_, &(m->buf_[m->read_idx_]), sizeof(m->buf_) - m->read_idx_);
if(ret == -EAGAIN)
return 0;
if(ret < 0) {
error(0, 0, "MIDI: cannot read from midi port: %s", snd_strerror(ret));
return -1;
}
m->read_idx_ += ret;
if(m->read_idx_ >= sizeof(m->buf_)) {
ret = midi_handle_message(m, x);
memset(m->buf_, 0, sizeof(m->buf_));
m->read_idx_ = 0;
return ret;
}
return 0;
}
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