diff options
Diffstat (limited to 'libs/ardour/midi_port.cc')
-rw-r--r-- | libs/ardour/midi_port.cc | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/libs/ardour/midi_port.cc b/libs/ardour/midi_port.cc new file mode 100644 index 0000000000..e785710b01 --- /dev/null +++ b/libs/ardour/midi_port.cc @@ -0,0 +1,102 @@ +/* + 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 <ardour/midi_port.h> +#include <ardour/data_type.h> +#include <iostream> + +using namespace ARDOUR; +using namespace std; + +MidiPort::MidiPort(jack_port_t* p) + : Port(p) + , _buffer(NULL) + , _nframes_this_cycle(0) +{ + DataType dt(_type); + assert(dt == DataType::MIDI); + + reset(); + + _buffer = new MidiBuffer(4096); // FIXME FIXME FIXME +} + + +MidiPort::~MidiPort() +{ + delete _buffer; +} + +void +MidiPort::cycle_start (jack_nframes_t nframes) +{ + _nframes_this_cycle = nframes; + + if (_flags & JackPortIsOutput) { + _buffer->set_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_port_get_info(jack_buffer, nframes)->event_count; + + assert(event_count < _buffer->capacity()); + + for (jack_nframes_t i=0; i < event_count; ++i) { + jack_midi_event_t* const ev = &_buffer->data()[i]; + jack_midi_event_get(ev, jack_buffer, i, nframes); + + // 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; + } + + _buffer->set_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; // catch any oopses + 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(); + + jack_midi_clear_buffer(jack_buffer, _nframes_this_cycle); + for (jack_nframes_t i=0; i < event_count; ++i) { + const jack_midi_event_t& ev = _buffer->data()[i]; + jack_midi_event_write(jack_buffer, ev.time, ev.buffer, ev.size, _nframes_this_cycle); + } + + _nframes_this_cycle = 0; // catch oopses +} |