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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_server.h"
#define NOTE_EN 0x00
#define NOTE_DE 0x01
u_int8_t done_data_en[] = { 0xB0, NOTE_EN, 0x01, 0xB0, NOTE_DE, 0x00 };
u_int8_t done_data_de[] = { 0xB0, NOTE_EN, 0x00, 0xB0, NOTE_DE, 0x01 };
int midi_init(midi_t* m, const char* device)
{
assert(m != NULL);
m->input_ = NULL;
m->output_ = NULL;
memset(m->buf_, 0, sizeof(m->buf_));
m->read_idx_ = 0;
slist_init(&(m->done_data_), free);
if(device) {
int ret = snd_rawmidi_open(&(m->input_), &(m->output_), 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)
{
assert(m);
if(!m->input_ || !m->output_)
return 0;
m->in_pfds_cnt_ = snd_rawmidi_poll_descriptors_count(m->input_);
assert(m->in_pfds_cnt_ > 0);
m->out_pfds_cnt_ = snd_rawmidi_poll_descriptors_count(m->output_);
assert(m->out_pfds_cnt_ > 0);
return (m->in_pfds_cnt_ + m->out_pfds_cnt_);
}
int midi_get_poll_fds(midi_t* m, struct pollfd *pfds, int npfds)
{
assert(m);
if(!m->input_ || !m->output_)
return 0;
snd_rawmidi_poll_descriptors(m->input_, pfds, m->in_pfds_cnt_);
snd_rawmidi_poll_descriptors(m->output_, &(pfds[m->in_pfds_cnt_]), npfds - m->in_pfds_cnt_);
int pending_data = 0;
if(m->done_data_.first_) {
midi_done_data_t* d = (midi_done_data_t*)(m->done_data_.first_->data_);
if(d->active_)
pending_data = 1;
}
if(!pending_data) {
int i;
for(i = m->in_pfds_cnt_; i < npfds; ++i)
pfds[i].events = 0;
}
return (m->in_pfds_cnt_ + m->out_pfds_cnt_);
}
void midi_lang_switch_done(void* data)
{
assert(data);
midi_done_data_t* d = data;
d->active_ = 1;
}
static int midi_enqueue_lang_switch(midi_t* m, mixer_t* x, const char* lang, const u_int8_t* buf, int len)
{
midi_done_data_t* done_data = malloc(sizeof(midi_done_data_t));
assert(done_data);
done_data->self_ = m;
done_data->active_ = 0;
done_data->buf_ = buf;
done_data->len_ = len;
done_data->write_idx_ = 0;
assert(slist_add(&(m->done_data_), done_data));
return mixer_switch_lang(x, lang, &midi_lang_switch_done, done_data);
}
static int midi_handle_note_on(midi_t* m, mixer_t* x)
{
int ret = 0;
switch(m->buf_[1]) {
case NOTE_EN: ret = midi_enqueue_lang_switch(m, x, "en", done_data_en, sizeof(done_data_en)); break;
case NOTE_DE: ret = midi_enqueue_lang_switch(m, x, "de", done_data_de, sizeof(done_data_de)); break;
default: printf("ignoring unknown note\n"); break;
}
return ret;
}
static int midi_handle_note_off(midi_t* m, mixer_t* x)
{
return 0;
}
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' : ' '); */
int ret = 0;
switch(m->buf_[0]) {
case 0x90: ret = midi_handle_note_on(m, x); break;
case 0x80: ret = midi_handle_note_off(m, x); break;
default: printf("ignoring unknown midi command\n"); break;
}
return ret;
}
static int midi_handle_in_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 ret;
}
static int midi_handle_out_revents(midi_t* m, struct pollfd *pfds, int npfds)
{
int err;
unsigned short revents;
if((err = snd_rawmidi_poll_descriptors_revents(m->output_, 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 & POLLOUT))
return 0;
assert(m->done_data_.first_);
midi_done_data_t* done_data = (midi_done_data_t*)(m->done_data_.first_->data_);
assert(done_data);
assert(done_data->active_);
assert(done_data->buf_);
int ret = snd_rawmidi_write(m->output_, &(done_data->buf_[done_data->write_idx_]), done_data->len_ - done_data->write_idx_);
if(ret == -EAGAIN)
return 0;
if(ret < 0) {
error(0, 0, "MIDI: cannot write to port: %s", snd_strerror(ret));
return -1;
}
done_data->write_idx_ += ret;
if(done_data->write_idx_ >= done_data->len_) {
if((err = snd_rawmidi_drain(m->output_)) < 0) {
error(0, 0, "MIDI: cannot drain output: %s", snd_strerror(err));
return -1;
}
slist_remove(&(m->done_data_), done_data);
}
return 0;
}
int midi_handle_revents(midi_t* m, struct pollfd *pfds, int npfds, mixer_t* x)
{
assert(m);
if(!m->input_ || !m->output_)
return 0;
int ret = midi_handle_in_revents(m, pfds, m->in_pfds_cnt_, x);
if(ret)
return ret;
return midi_handle_out_revents(m, &(pfds[m->in_pfds_cnt_]), m->out_pfds_cnt_);
}
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