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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 <iprt/assert.h>
#include <iprt/poll.h>
#include <VBox/err.h>
#include <VBox/log.h>
#include <alsa/asoundlib.h>
#include <sys/eventfd.h>
#include "midialsa.h"
#define MAX_POLL_FDS 4
MIDIAlsa::MIDIAlsa() : _out(NULL), _eventfd(-1)
{
}
MIDIAlsa::~MIDIAlsa()
{
}
int MIDIAlsa::open(const char *dev)
{
int err;
_eventfd = ::eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
if (_eventfd == -1) {
LogWarn(("eventfd error: %s\n", strerror(errno)));
return RTErrConvertFromErrno(errno);
}
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;
}
if (_eventfd) {
::close(_eventfd);
}
return VINF_SUCCESS;
}
int MIDIAlsa::reset()
{
if (_in) {
snd_rawmidi_drop(_in);
}
if (_out) {
snd_rawmidi_drop(_out);
}
return VINF_SUCCESS;
}
int MIDIAlsa::poll(uint32_t events, uint32_t *revents, RTMSINTERVAL millies)
{
struct pollfd pfds[MAX_POLL_FDS];
int i_pipe = -1, i_in = -1, i_out = -1;
int n_in = 0, n_out = 0;
int nfds = 0;
LogFlowFuncEnter();
*revents = 0;
if (millies > 0 && _eventfd != -1) {
LogFlowFunc(("including eventfd\n"));
i_pipe = nfds;
pfds[nfds].fd = _eventfd;
pfds[nfds].events = POLLIN;
nfds++;
}
if (_in && events & RTPOLL_EVT_READ) {
LogFlowFunc(("including in\n"));
i_in = nfds;
n_in = snd_rawmidi_poll_descriptors(_in, &pfds[i_in], MAX_POLL_FDS - nfds);
AssertLogRelReturn(n_in > 0, VERR_IO_NOT_READY);
nfds+=n_in;
}
if (_out && events & RTPOLL_EVT_WRITE) {
LogFlowFunc(("including out\n"));
i_out = nfds;
n_out = snd_rawmidi_poll_descriptors(_out, &pfds[i_out], MAX_POLL_FDS - nfds);
AssertLogRelReturn(n_out > 0, VERR_IO_NOT_READY);
nfds+=n_out;
}
AssertReturn(millies != RT_INDEFINITE_WAIT || nfds > 0, VERR_DEADLOCK);
int rc;
int ready = ::poll(pfds, nfds, millies = RT_INDEFINITE_WAIT ? -1 : millies);
LogFlowFunc(("poll ready=%d\n", ready));
if (ready < 0) {
if (errno != EAGAIN && errno != EINTR) {
LogWarnFunc(("Cannot poll, errno=%d\n", errno));
rc = VERR_IO_NOT_READY;
} else {
rc = VINF_TRY_AGAIN;
}
} else if (ready == 0) {
// Timeout
rc = VINF_TIMEOUT;
} else /* ready > 0 */ {
rc = VINF_SUCCESS;
if (i_pipe != -1) {
if (pfds[i_pipe].revents) {
uint64_t val;
ssize_t r = ::read(_eventfd, &val, sizeof(val));
Assert(r == sizeof(val));
NOREF(r);
rc = VINF_INTERRUPTED;
}
}
if (i_in != -1) {
Assert(n_in > 0);
unsigned short rev;
int err = snd_rawmidi_poll_descriptors_revents(_in, &pfds[i_in], n_in, &rev);
AssertLogRelReturn(err >= 0, VERR_IO_GEN_FAILURE);
if (rev & POLLIN) *revents |= RTPOLL_EVT_READ;
if (rev & (POLLNVAL|POLLERR)) *revents |= RTPOLL_EVT_ERROR;
}
if (i_out != -1) {
Assert(n_out > 0);
unsigned short rev;
int err = snd_rawmidi_poll_descriptors_revents(_out, &pfds[i_out], n_out, &rev);
AssertLogRelReturn(err >= 0, VERR_IO_GEN_FAILURE);
if (rev & POLLOUT) *revents |= RTPOLL_EVT_WRITE;
if (rev & (POLLNVAL|POLLERR)) *revents |= RTPOLL_EVT_ERROR;
}
}
LogFlowFuncLeaveRC(rc);
return rc;
}
int MIDIAlsa::pollInterrupt()
{
if (_eventfd) {
uint64_t val = 1;
ssize_t r = ::write(_eventfd, &val, sizeof(val));
Assert(r == sizeof(uint64_t));
NOREF(r);
return VINF_SUCCESS;
} else {
return VERR_INVALID_STATE;
}
}
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\n", snd_strerror(result)));
return VERR_BROKEN_PIPE;
}
return result;
}
ssize_t MIDIAlsa::read(uint8_t *buf, size_t len)
{
ssize_t result = snd_rawmidi_read(_in, buf, len);
if (result < 0) {
LogWarn(("ALSA midi read error: %s\n", snd_strerror(result)));
return VERR_BROKEN_PIPE;
}
return result;
}
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