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/*
* Copyright (C) 2022 Javier S. Pedro
*
* This program 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 2
* of the License, or (at your option) any later version.
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#define LOG_ENABLED 1
#define LOG_ENABLE_FLOW 1
#define LOG_GROUP LOG_GROUP_DEV_SB16
#include <VBox/err.h>
#include <VBox/log.h>
#include <alsa/asoundlib.h>
#include "midialsa.h"
#define MAX_POLL_FDS 4
static ssize_t rawmidi_avail(snd_rawmidi_t *rmidi)
{
struct pollfd pfds[MAX_POLL_FDS];
int nfds = snd_rawmidi_poll_descriptors(rmidi, pfds, MAX_POLL_FDS);
if (nfds <= 0) {
LogWarn(("ALSA rawmidi avail: no descriptors to poll!"));
return VERR_AUDIO_ENUMERATION_FAILED;
}
int ready = poll(pfds, nfds, 0);
if (ready < 0) {
if (errno != EAGAIN && errno != EINTR) {
LogWarnFunc(("Cannot poll, errno=%d", errno));
return VERR_AUDIO_STREAM_NOT_READY;
}
return 0;
} else if (ready == 0) {
return 0;
} else /* ready > 0 */ {
unsigned short revents;
int err = snd_rawmidi_poll_descriptors_revents(rmidi, pfds, nfds, &revents);
if (err != 0) {
LogWarnFunc(("Cannot call revents, err=%d", err));
return VERR_AUDIO_STREAM_NOT_READY;
}
if (revents & POLLNVAL) {
LogWarnFunc(("POLLNVAL"));
}
if (revents & POLLERR) {
LogWarnFunc(("POLLERR"));
}
return revents & (POLLIN | POLLOUT);
}
}
MIDIAlsa::MIDIAlsa() : _out(NULL)
{
}
MIDIAlsa::~MIDIAlsa()
{
}
int MIDIAlsa::open(const char *dev)
{
int err;
if ((err = snd_rawmidi_open(&_in, &_out, "virtual", SND_RAWMIDI_NONBLOCK))) {
LogWarn(("ALSA rawmidi open error: %s\n", snd_strerror(err)));
return VERR_AUDIO_STREAM_COULD_NOT_CREATE;
}
// TODO: Connect somewhere
NOREF(dev);
return VINF_SUCCESS;
}
int MIDIAlsa::close()
{
if (_in) {
snd_rawmidi_close(_in);
_in = NULL;
}
if (_out) {
snd_rawmidi_close(_out);
_out = NULL;
}
return VINF_SUCCESS;
}
ssize_t MIDIAlsa::writeAvail()
{
return _out ? rawmidi_avail(_out) : 0;
}
ssize_t MIDIAlsa::write(uint8_t *data, size_t len)
{
ssize_t result = snd_rawmidi_write(_out, data, len);
if (result < 0) {
LogWarn(("ALSA midi write error: %s", snd_strerror(result)));
return VERR_AUDIO_STREAM_NOT_READY;
}
return result;
}
ssize_t MIDIAlsa::readAvail()
{
return _in ? rawmidi_avail(_in) : 0;
}
ssize_t MIDIAlsa::read(uint8_t *buf, size_t len)
{
ssize_t result = snd_rawmidi_read(_out, buf, len);
if (result < 0) {
LogWarn(("ALSA midi read error: %s", snd_strerror(result)));
return VERR_AUDIO_STREAM_NOT_READY;
}
return result;
}
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