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livetrax/libs/midi++2/jack_midi_port.cc

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/*
Copyright (C) 1998 Paul Barton-Davis
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.
$Id$
*/
#include <iostream>
#include <cstdio>
#include <fcntl.h>
#include <errno.h>
#include <jack/jack.h>
#include <jack/midiport.h>
#include "pbd/xml++.h"
#include "pbd/error.h"
#include "pbd/failed_constructor.h"
#include "pbd/convert.h"
#include "pbd/strsplit.h"
#include "pbd/stacktrace.h"
#include "midi++/types.h"
#include "midi++/jack_midi_port.h"
#include "midi++/channel.h"
using namespace MIDI;
using namespace std;
using namespace PBD;
namespace Evoral {
template class EventRingBuffer<timestamp_t>;
}
pthread_t JackMIDIPort::_process_thread;
Signal0<void> JackMIDIPort::JackHalted;
Signal0<void> JackMIDIPort::MakeConnections;
JackMIDIPort::JackMIDIPort (string const & name, Flags flags, jack_client_t* jack_client)
: Port (name, flags)
, _currently_in_cycle (false)
, _nframes_this_cycle (0)
, _jack_client (jack_client)
, _jack_port (0)
, _last_write_timestamp (0)
, output_fifo (512)
, input_fifo (1024)
, xthread (true)
{
assert (jack_client);
init (name, flags);
}
JackMIDIPort::JackMIDIPort (const XMLNode& node, jack_client_t* jack_client)
: Port (node)
, _currently_in_cycle (false)
, _nframes_this_cycle (0)
, _jack_client (jack_client)
, _jack_port (0)
, _last_write_timestamp (0)
, output_fifo (512)
, input_fifo (1024)
, xthread (true)
{
assert (jack_client);
Descriptor desc (node);
init (desc.tag, desc.flags);
set_state (node);
}
void
JackMIDIPort::init (const string& /*name*/, Flags /*flags*/)
{
if (!create_port ()) {
_ok = true;
}
MakeConnections.connect_same_thread (connect_connection, boost::bind (&JackMIDIPort::make_connections, this));
JackHalted.connect_same_thread (halt_connection, boost::bind (&JackMIDIPort::jack_halted, this));
}
JackMIDIPort::~JackMIDIPort ()
{
if (_jack_port) {
if (_jack_client) {
jack_port_unregister (_jack_client, _jack_port);
_jack_port = 0;
}
}
}
void
JackMIDIPort::parse (framecnt_t timestamp)
{
byte buf[512];
/* NOTE: parsing is done (if at all) by initiating a read from
the port. Each port implementation calls on the parser
once it has data ready.
*/
_parser->set_timestamp (timestamp);
while (1) {
// cerr << "+++ READ ON " << name() << endl;
int nread = read (buf, sizeof (buf));
// cerr << "-- READ (" << nread << " ON " << name() << endl;
if (nread > 0) {
if ((size_t) nread < sizeof (buf)) {
break;
} else {
continue;
}
} else if (nread == 0) {
break;
} else if (errno == EAGAIN) {
break;
} else {
fatal << "Error reading from MIDI port " << name() << endmsg;
/*NOTREACHED*/
}
}
}
void
JackMIDIPort::cycle_start (pframes_t nframes)
{
assert (_jack_port);
_currently_in_cycle = true;
_nframes_this_cycle = nframes;
assert(_nframes_this_cycle == nframes);
if (sends_output()) {
void *buffer = jack_port_get_buffer (_jack_port, nframes);
jack_midi_clear_buffer (buffer);
flush (buffer);
}
if (receives_input()) {
void* jack_buffer = jack_port_get_buffer(_jack_port, nframes);
const pframes_t event_count = jack_midi_get_event_count(jack_buffer);
jack_midi_event_t ev;
timestamp_t cycle_start_frame = jack_last_frame_time (_jack_client);
for (pframes_t i = 0; i < event_count; ++i) {
jack_midi_event_get (&ev, jack_buffer, i);
input_fifo.write (cycle_start_frame + ev.time, (Evoral::EventType) 0, ev.size, ev.buffer);
}
if (event_count) {
xthread.wakeup ();
}
}
}
void
JackMIDIPort::cycle_end ()
{
if (sends_output()) {
flush (jack_port_get_buffer (_jack_port, _nframes_this_cycle));
}
_currently_in_cycle = false;
_nframes_this_cycle = 0;
}
void
JackMIDIPort::jack_halted ()
{
_jack_client = 0;
_jack_port = 0;
}
void
JackMIDIPort::drain (int check_interval_usecs)
{
RingBuffer< Evoral::Event<double> >::rw_vector vec = { { 0, 0 }, { 0, 0} };
if (is_process_thread()) {
error << "Process thread called MIDI::JackMIDIPort::drain() - this cannot work" << endmsg;
return;
}
while (1) {
output_fifo.get_write_vector (&vec);
if (vec.len[0] + vec.len[1] >= output_fifo.bufsize() - 1) {
break;
}
usleep (check_interval_usecs);
}
}
int
JackMIDIPort::write (const byte * msg, size_t msglen, timestamp_t timestamp)
{
int ret = 0;
if (!_jack_client || !_jack_port) {
/* poof ! make it just vanish into thin air, since we are no
longer connected to JACK.
*/
return msglen;
}
if (!sends_output()) {
return ret;
}
if (!is_process_thread()) {
Glib::Threads::Mutex::Lock lm (output_fifo_lock);
RingBuffer< Evoral::Event<double> >::rw_vector vec = { { 0, 0 }, { 0, 0} };
output_fifo.get_write_vector (&vec);
if (vec.len[0] + vec.len[1] < 1) {
error << "no space in FIFO for non-process thread MIDI write" << endmsg;
return 0;
}
if (vec.len[0]) {
if (!vec.buf[0]->owns_buffer()) {
vec.buf[0]->set_buffer (0, 0, true);
}
vec.buf[0]->set (msg, msglen, timestamp);
} else {
if (!vec.buf[1]->owns_buffer()) {
vec.buf[1]->set_buffer (0, 0, true);
}
vec.buf[1]->set (msg, msglen, timestamp);
}
output_fifo.increment_write_idx (1);
ret = msglen;
} else {
if (timestamp >= _nframes_this_cycle) {
std::cerr << "attempting to write MIDI event of " << msglen << " bytes at time "
<< timestamp << " of " << _nframes_this_cycle
<< " (this will not work - needs a code fix)"
<< std::endl;
}
if (_currently_in_cycle) {
if (timestamp == 0) {
timestamp = _last_write_timestamp;
}
if ((ret = jack_midi_event_write (jack_port_get_buffer (_jack_port, _nframes_this_cycle),
timestamp, msg, msglen)) == 0) {
ret = msglen;
_last_write_timestamp = timestamp;
} else {
cerr << "write of " << msglen << " @ " << timestamp << " failed, port holds "
<< jack_midi_get_event_count (jack_port_get_buffer (_jack_port, _nframes_this_cycle))
<< " port is " << _jack_port
<< " ntf = " << _nframes_this_cycle
<< " buf = " << jack_port_get_buffer (_jack_port, _nframes_this_cycle)
<< " ret = " << ret
<< endl;
PBD::stacktrace (cerr, 20);
ret = 0;
}
} else {
cerr << "write to JACK midi port failed: not currently in a process cycle." << endl;
PBD::stacktrace (cerr, 20);
}
}
if (ret > 0 && _parser) {
// ardour doesn't care about this and neither should your app, probably
// output_parser->raw_preparse (*output_parser, msg, ret);
for (int i = 0; i < ret; i++) {
_parser->scanner (msg[i]);
}
// ardour doesn't care about this and neither should your app, probably
// output_parser->raw_postparse (*output_parser, msg, ret);
}
return ret;
}
void
JackMIDIPort::flush (void* jack_port_buffer)
{
RingBuffer< Evoral::Event<double> >::rw_vector vec = { { 0, 0 }, { 0, 0 } };
size_t written;
output_fifo.get_read_vector (&vec);
if (vec.len[0] + vec.len[1]) {
// cerr << "Flush " << vec.len[0] + vec.len[1] << " events from non-process FIFO\n";
}
if (vec.len[0]) {
Evoral::Event<double>* evp = vec.buf[0];
for (size_t n = 0; n < vec.len[0]; ++n, ++evp) {
jack_midi_event_write (jack_port_buffer,
(timestamp_t) evp->time(), evp->buffer(), evp->size());
}
}
if (vec.len[1]) {
Evoral::Event<double>* evp = vec.buf[1];
for (size_t n = 0; n < vec.len[1]; ++n, ++evp) {
jack_midi_event_write (jack_port_buffer,
(timestamp_t) evp->time(), evp->buffer(), evp->size());
}
}
if ((written = vec.len[0] + vec.len[1]) != 0) {
output_fifo.increment_read_idx (written);
}
}
int
JackMIDIPort::read (byte *, size_t)
{
if (!receives_input()) {
return 0;
}
timestamp_t time;
Evoral::EventType type;
uint32_t size;
byte buffer[input_fifo.capacity()];
while (input_fifo.read (&time, &type, &size, buffer)) {
_parser->set_timestamp (time);
for (uint32_t i = 0; i < size; ++i) {
_parser->scanner (buffer[i]);
}
}
return 0;
}
int
JackMIDIPort::create_port ()
{
_jack_port = jack_port_register(_jack_client, _tagname.c_str(), JACK_DEFAULT_MIDI_TYPE, _flags, 0);
return _jack_port == 0 ? -1 : 0;
}
XMLNode&
JackMIDIPort::get_state () const
{
XMLNode& root = Port::get_state ();
#if 0
byte device_inquiry[6];
device_inquiry[0] = 0xf0;
device_inquiry[0] = 0x7e;
device_inquiry[0] = 0x7f;
device_inquiry[0] = 0x06;
device_inquiry[0] = 0x02;
device_inquiry[0] = 0xf7;
write (device_inquiry, sizeof (device_inquiry), 0);
#endif
if (_jack_port) {
const char** jc = jack_port_get_connections (_jack_port);
string connection_string;
if (jc) {
for (int i = 0; jc[i]; ++i) {
if (i > 0) {
connection_string += ',';
}
connection_string += jc[i];
}
free (jc);
}
if (!connection_string.empty()) {
root.add_property ("connections", connection_string);
}
} else {
if (!_connections.empty()) {
root.add_property ("connections", _connections);
}
}
return root;
}
void
JackMIDIPort::set_state (const XMLNode& node)
{
const XMLProperty* prop;
if ((prop = node.property ("tag")) == 0 || prop->value() != _tagname) {
return;
}
Port::set_state (node);
if ((prop = node.property ("connections")) != 0) {
_connections = prop->value ();
}
}
void
JackMIDIPort::make_connections ()
{
if (!_connections.empty()) {
vector<string> ports;
split (_connections, ports, ',');
for (vector<string>::iterator x = ports.begin(); x != ports.end(); ++x) {
if (_jack_client) {
if (receives_input()) {
jack_connect (_jack_client, (*x).c_str(), jack_port_name (_jack_port));
} else {
jack_connect (_jack_client, jack_port_name (_jack_port), (*x).c_str());
}
/* ignore failures */
}
}
}
connect_connection.disconnect ();
}
void
JackMIDIPort::set_process_thread (pthread_t thr)
{
_process_thread = thr;
}
bool
JackMIDIPort::is_process_thread()
{
return (pthread_self() == _process_thread);
}
void
JackMIDIPort::reestablish (jack_client_t* jack)
{
_jack_client = jack;
int const r = create_port ();
if (r) {
PBD::error << "could not reregister ports for " << name() << endmsg;
}
}
void
JackMIDIPort::reconnect ()
{
make_connections ();
}