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/*
Copyright (C) 2006 Paul Davis
Written by Dave Robillard
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: alsa_sequencer_midiport.cc 244 2006-01-06 04:59:17Z essej $
*/
#include <fcntl.h>
#include <cerrno>
#include <cassert>
#include <midi++/types.h>
#include <midi++/jack.h>
#include <midi++/port_request.h>
using namespace std;
using namespace MIDI;
JACK_MidiPort::JACK_MidiPort(PortRequest & req, jack_client_t* jack_client)
: Port(req)
, _jack_client(jack_client)
, _jack_input_port(NULL)
, _jack_output_port(NULL)
, _last_read_index(0)
{
int err = create_ports(req);
if (!err) {
req.status = PortRequest::OK;
_ok = true;
} else {
req.status = PortRequest::Unknown;
}
}
JACK_MidiPort::~JACK_MidiPort()
{
// FIXME: remove port
}
void
JACK_MidiPort::cycle_start (nframes_t nframes)
{
Port::cycle_start(nframes);
assert(_nframes_this_cycle == nframes);
_last_read_index = 0;
jack_midi_clear_buffer(jack_port_get_buffer(_jack_output_port, nframes), nframes);
}
int
JACK_MidiPort::write(byte * msg, size_t msglen, timestamp_t timestamp)
{
assert(_currently_in_cycle);
assert(timestamp < _nframes_this_cycle);
assert(_jack_output_port);
// FIXME: return value correct?
return jack_midi_event_write (
jack_port_get_buffer(_jack_output_port, _nframes_this_cycle),
timestamp, msg, msglen, _nframes_this_cycle);
}
int
JACK_MidiPort::read(byte * buf, size_t max, timestamp_t timestamp)
{
assert(_currently_in_cycle);
assert(timestamp < _nframes_this_cycle);
assert(_jack_input_port);
jack_midi_event_t ev;
int err = jack_midi_event_get (&ev,
jack_port_get_buffer(_jack_input_port, _nframes_this_cycle),
_last_read_index++, _nframes_this_cycle);
if (!err) {
memcpy(buf, ev.buffer, ev.size);
return ev.size;
} else {
return 0;
}
}
int
JACK_MidiPort::create_ports(PortRequest & req)
{
assert(!_jack_input_port);
assert(!_jack_output_port);
jack_nframes_t nframes = jack_get_buffer_size(_jack_client);
bool ret = true;
if (req.mode == O_RDWR || req.mode == O_WRONLY) {
_jack_output_port = jack_port_register(_jack_client,
string(req.tagname).append("_out").c_str(),
JACK_DEFAULT_MIDI_TYPE, JackPortIsOutput, 0);
jack_midi_reset_new_port(
jack_port_get_buffer(_jack_output_port, nframes), nframes);
ret = ret && (_jack_output_port != NULL);
}
if (req.mode == O_RDWR || req.mode == O_RDONLY) {
_jack_input_port = jack_port_register(_jack_client,
string(req.tagname).append("_in").c_str(),
JACK_DEFAULT_MIDI_TYPE, JackPortIsInput, 0);
jack_midi_reset_new_port(
jack_port_get_buffer(_jack_input_port, nframes), nframes);
ret = ret && (_jack_input_port != NULL);
}
return ret ? 0 : -1;
}
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