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/*
Copyright (C) 2006 Paul 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.
*/
#include <cassert>
#include <iostream>
#include <ardour/midi_port.h>
#include <ardour/data_type.h>
#include <midi++/jackcompat.h>
using namespace ARDOUR;
using namespace std;
MidiPort::MidiPort(jack_port_t* p)
: Port(p)
, _buffer(4096) // FIXME FIXME FIXME Jack needs to tell us this
, _nframes_this_cycle(0)
{
DataType dt(_type);
assert(dt == DataType::MIDI);
reset();
}
MidiPort::~MidiPort()
{
}
void
MidiPort::cycle_start (jack_nframes_t nframes)
{
_buffer.clear();
assert(_buffer.size() == 0);
_nframes_this_cycle = nframes;
if (_flags & JackPortIsOutput) {
_buffer.silence(nframes);
assert(_buffer.size() == 0);
return;
}
// We're an input - copy Jack events to internal buffer
void* jack_buffer = jack_port_get_buffer(_port, nframes);
const jack_nframes_t event_count
= jack_midi_get_event_count(jack_buffer);
assert(event_count < _buffer.capacity());
MidiEvent ev;
// FIXME: too slow, event struct is copied twice (here and MidiBuffer::push_back)
for (jack_nframes_t i=0; i < event_count; ++i) {
// This will fail to compile if we change MidiEvent to our own class
jack_midi_event_get(static_cast<jack_midi_event_t*>(&ev), jack_buffer, i);
_buffer.push_back(ev);
// Convert note ons with velocity 0 to proper note offs
// FIXME: Jack MIDI should guarantee this - does it?
//if (ev->buffer[0] == MIDI_CMD_NOTE_ON && ev->buffer[2] == 0)
// ev->buffer[0] = MIDI_CMD_NOTE_OFF;
}
assert(_buffer.size() == event_count);
//if (_buffer.size() > 0)
// cerr << "MIDIPort got " << event_count << " events." << endl;
}
void
MidiPort::cycle_end()
{
if (_flags & JackPortIsInput) {
_nframes_this_cycle = 0;
return;
}
// We're an output - copy events from internal buffer to Jack buffer
void* jack_buffer = jack_port_get_buffer(_port, _nframes_this_cycle);
const jack_nframes_t event_count = _buffer.size();
//if (event_count > 0)
// cerr << "MIDIPort writing " << event_count << " events." << endl;
jack_midi_clear_buffer(jack_buffer);
for (jack_nframes_t i=0; i < event_count; ++i) {
const jack_midi_event_t& ev = _buffer[i];
assert(ev.time < _nframes_this_cycle);
jack_midi_event_write(jack_buffer, ev.time, ev.buffer, ev.size);
}
_nframes_this_cycle = 0;
}
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