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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 "mixer.h"
int mixer_init(mixer_t* m, const char* name, const char* device)
{
assert(m != NULL);
m->name_ = name;
m->output_ = NULL;
int ret = snd_rawmidi_open(NULL, &(m->output_), device, SND_RAWMIDI_NONBLOCK);
if(ret < 0) {
error(0, 0, "MIXER: cannot open midi port '%s': %s", device, snd_strerror(ret));
return ret;
}
return 0;
}
int mixer_get_poll_fd_count(mixer_t* m)
{
return snd_rawmidi_poll_descriptors_count(m->output_);
}
int mixer_get_poll_fds(mixer_t* m, struct pollfd *pfds, int npfds)
{
return snd_rawmidi_poll_descriptors(m->output_, pfds, npfds);
}
int mixer_handle_revents(mixer_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, "MIXER: cannot get poll events: %s", snd_strerror(errno));
return -1;
}
if(pfds[0].revents & (POLLERR | POLLHUP | POLLNVAL)) {
error(0, 0, "MIXER: got POLLERR, POLLHUP or POLLNVAL");
return -1;
}
if(!(revents & POLLOUT))
return 0;
u_int8_t buf[3] = { 0xB0, 0x00, 0x02 };
int ret = snd_rawmidi_write(m->output_, buf, sizeof(buf));
if(ret == -EAGAIN)
return 0;
if(ret < 0) {
error(0, 0, "MIXER: cannot write to midi port: %s", snd_strerror(ret));
return -1;
}
assert(ret == sizeof(buf)); // TODO: try again??
if((err = snd_rawmidi_drain(m->output_)) < 0) {
error(0, 0, "MIXER: cannot drain output: %s", snd_strerror(err));
return -1;
}
return 0;
}
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