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livetrax/libs/backends/alsa/alsa_sequencer.cc

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/*
* Copyright (C) 2014 Robin Gareus <robin@gareus.org>
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <unistd.h>
#include <glibmm.h>
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#include "select_sleep.h"
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#include "alsa_sequencer.h"
#include "pbd/error.h"
#include "pbd/i18n.h"
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using namespace ARDOUR;
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/* max bytes per individual midi-event
* events larger than this are ignored */
#define MaxAlsaSeqEventSize (64)
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#ifndef NDEBUG
#define _DEBUGPRINT(STR) fprintf(stderr, STR);
#else
#define _DEBUGPRINT(STR) ;
#endif
AlsaSeqMidiIO::AlsaSeqMidiIO (const std::string &name, const char *device, const bool input)
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: AlsaMidiIO()
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, _seq (0)
{
_name = name;
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init (device, input);
}
AlsaSeqMidiIO::~AlsaSeqMidiIO ()
{
if (_seq) {
snd_seq_close (_seq);
_seq = 0;
}
}
void
AlsaSeqMidiIO::init (const char *device_name, const bool input)
{
if (snd_seq_open (&_seq, "hw",
input ? SND_SEQ_OPEN_INPUT : SND_SEQ_OPEN_OUTPUT, 0) < 0)
{
_seq = 0;
return;
}
if (snd_seq_set_client_name (_seq, "Ardour")) {
_DEBUGPRINT("AlsaSeqMidiIO: cannot set client name.\n");
goto initerr;
}
_port = snd_seq_create_simple_port (_seq, "port", SND_SEQ_PORT_CAP_NO_EXPORT |
(input ? SND_SEQ_PORT_CAP_WRITE : SND_SEQ_PORT_CAP_READ),
SND_SEQ_PORT_TYPE_APPLICATION);
if (_port < 0) {
_DEBUGPRINT("AlsaSeqMidiIO: cannot create port.\n");
goto initerr;
}
_npfds = snd_seq_poll_descriptors_count (_seq, input ? POLLIN : POLLOUT);
if (_npfds < 1) {
_DEBUGPRINT("AlsaSeqMidiIO: no poll descriptor(s).\n");
goto initerr;
}
_pfds = (struct pollfd*) malloc (_npfds * sizeof(struct pollfd));
snd_seq_poll_descriptors (_seq, _pfds, _npfds, input ? POLLIN : POLLOUT);
snd_seq_addr_t port;
if (snd_seq_parse_address (_seq, &port, device_name) < 0) {
_DEBUGPRINT("AlsaSeqMidiIO: cannot resolve hardware port.\n");
goto initerr;
}
if (input) {
if (snd_seq_connect_from (_seq, _port, port.client, port.port) < 0) {
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_DEBUGPRINT("AlsaSeqMidiIO: cannot connect input port.\n");
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goto initerr;
}
} else {
if (snd_seq_connect_to (_seq, _port, port.client, port.port) < 0) {
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_DEBUGPRINT("AlsaSeqMidiIO: cannot connect output port.\n");
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goto initerr;
}
}
snd_seq_nonblock(_seq, 1);
_state = 0;
return;
initerr:
PBD::error << _("AlsaSeqMidiIO: Device initialization failed.") << endmsg;
snd_seq_close (_seq);
_seq = 0;
return;
}
///////////////////////////////////////////////////////////////////////////////
AlsaSeqMidiOut::AlsaSeqMidiOut (const std::string &name, const char *device)
: AlsaSeqMidiIO (name, device, false)
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, AlsaMidiOut ()
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{
}
void *
AlsaSeqMidiOut::main_process_thread ()
{
_running = true;
bool need_drain = false;
snd_midi_event_t *alsa_codec = NULL;
snd_midi_event_new (MaxAlsaSeqEventSize, &alsa_codec);
pthread_mutex_lock (&_notify_mutex);
while (_running) {
bool have_data = false;
struct MidiEventHeader h(0,0);
uint8_t data[MaxAlsaSeqEventSize];
const uint32_t read_space = _rb->read_space();
if (read_space > sizeof(MidiEventHeader)) {
if (_rb->read ((uint8_t*)&h, sizeof(MidiEventHeader)) != sizeof(MidiEventHeader)) {
_DEBUGPRINT("AlsaSeqMidiOut: Garbled MIDI EVENT HEADER!!\n");
break;
}
assert (read_space >= h.size);
if (h.size > MaxAlsaSeqEventSize) {
_rb->increment_read_idx (h.size);
_DEBUGPRINT("AlsaSeqMidiOut: MIDI event too large!\n");
continue;
}
if (_rb->read (&data[0], h.size) != h.size) {
_DEBUGPRINT("AlsaSeqMidiOut: Garbled MIDI EVENT DATA!!\n");
break;
}
have_data = true;
}
if (!have_data) {
if (need_drain) {
snd_seq_drain_output (_seq);
need_drain = false;
}
pthread_cond_wait (&_notify_ready, &_notify_mutex);
continue;
}
snd_seq_event_t alsa_event;
snd_seq_ev_clear (&alsa_event);
snd_midi_event_reset_encode (alsa_codec);
if (!snd_midi_event_encode (alsa_codec, data, h.size, &alsa_event)) {
PBD::error << _("AlsaSeqMidiOut: Invalid Midi Event.") << endmsg;
continue;
}
snd_seq_ev_set_source (&alsa_event, _port);
snd_seq_ev_set_subs (&alsa_event);
snd_seq_ev_set_direct (&alsa_event);
uint64_t now = g_get_monotonic_time();
while (h.time > now + 500) {
if (need_drain) {
snd_seq_drain_output (_seq);
need_drain = false;
} else {
select_sleep(h.time - now);
}
now = g_get_monotonic_time();
}
retry:
int perr = poll (_pfds, _npfds, 10 /* ms */);
if (perr < 0) {
PBD::error << _("AlsaSeqMidiOut: Error polling device. Terminating Midi Thread.") << endmsg;
break;
}
if (perr == 0) {
_DEBUGPRINT("AlsaSeqMidiOut: poll() timed out.\n");
goto retry;
}
ssize_t err = snd_seq_event_output(_seq, &alsa_event);
if ((err == -EAGAIN)) {
snd_seq_drain_output (_seq);
goto retry;
}
if (err == -EWOULDBLOCK) {
select_sleep (1000);
goto retry;
}
if (err < 0) {
PBD::error << _("AlsaSeqMidiOut: write failed. Terminating Midi Thread.") << endmsg;
break;
}
need_drain = true;
}
pthread_mutex_unlock (&_notify_mutex);
if (alsa_codec) {
snd_midi_event_free(alsa_codec);
}
_DEBUGPRINT("AlsaSeqMidiOut: MIDI OUT THREAD STOPPED\n");
return 0;
}
///////////////////////////////////////////////////////////////////////////////
AlsaSeqMidiIn::AlsaSeqMidiIn (const std::string &name, const char *device)
: AlsaSeqMidiIO (name, device, true)
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, AlsaMidiIn ()
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{
}
void *
AlsaSeqMidiIn::main_process_thread ()
{
_running = true;
bool do_poll = true;
snd_midi_event_t *alsa_codec = NULL;
snd_midi_event_new (MaxAlsaSeqEventSize, &alsa_codec);
while (_running) {
if (do_poll) {
snd_seq_poll_descriptors (_seq, _pfds, _npfds, POLLIN);
int perr = poll (_pfds, _npfds, 100 /* ms */);
if (perr < 0) {
PBD::error << _("AlsaSeqMidiIn: Error polling device. Terminating Midi Thread.") << endmsg;
break;
}
if (perr == 0) {
continue;
}
}
snd_seq_event_t *event;
uint64_t time = g_get_monotonic_time();
ssize_t err = snd_seq_event_input (_seq, &event);
if ((err == -EAGAIN) || (err == -EWOULDBLOCK)) {
do_poll = true;
continue;
}
if (err == -ENOSPC) {
PBD::error << _("AlsaSeqMidiIn: FIFO overrun.") << endmsg;
do_poll = true;
continue;
}
if (err < 0) {
PBD::error << _("AlsaSeqMidiIn: read error. Terminating Midi") << endmsg;
break;
}
uint8_t data[MaxAlsaSeqEventSize];
snd_midi_event_reset_decode (alsa_codec);
ssize_t size = snd_midi_event_decode (alsa_codec, data, sizeof(data), event);
if (size > 0) {
queue_event (time, data, size);
}
do_poll = (0 == err);
}
if (alsa_codec) {
snd_midi_event_free(alsa_codec);
}
_DEBUGPRINT("AlsaSeqMidiIn: MIDI IN THREAD STOPPED\n");
return 0;
}