2 Copyright (C) 1998 Paul Barton-Davis
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include <glibmm/timer.h>
26 #include "pbd/error.h"
27 #include "pbd/stacktrace.h"
29 #include "midi++/types.h"
31 #include "ardour/async_midi_port.h"
32 #include "ardour/audioengine.h"
33 #include "ardour/midi_buffer.h"
36 using namespace ARDOUR;
41 template class EventRingBuffer<MIDI::timestamp_t>;
44 pthread_t AsyncMIDIPort::_process_thread;
46 #define port_engine AudioEngine::instance()->port_engine()
48 AsyncMIDIPort::AsyncMIDIPort (string const & name, PortFlags flags)
49 : MidiPort (name, flags)
50 , MIDI::Port (name, MIDI::Port::Flags (0))
51 , _currently_in_cycle (false)
52 , _last_write_timestamp (0)
60 AsyncMIDIPort::~AsyncMIDIPort ()
65 AsyncMIDIPort::set_timer (boost::function<MIDI::framecnt_t (void)>& f)
72 AsyncMIDIPort::flush_output_fifo (MIDI::pframes_t nframes)
74 RingBuffer< Evoral::Event<double> >::rw_vector vec = { { 0, 0 }, { 0, 0 } };
77 output_fifo.get_read_vector (&vec);
79 MidiBuffer& mb (get_midi_buffer (nframes));
82 Evoral::Event<double>* evp = vec.buf[0];
84 for (size_t n = 0; n < vec.len[0]; ++n, ++evp) {
85 mb.push_back (evp->time(), evp->size(), evp->buffer());
90 Evoral::Event<double>* evp = vec.buf[1];
92 for (size_t n = 0; n < vec.len[1]; ++n, ++evp) {
93 mb.push_back (evp->time(), evp->size(), evp->buffer());
97 if ((written = vec.len[0] + vec.len[1]) != 0) {
98 output_fifo.increment_read_idx (written);
103 AsyncMIDIPort::cycle_start (MIDI::pframes_t nframes)
105 _currently_in_cycle = true;
106 MidiPort::cycle_start (nframes);
108 /* dump anything waiting in the output FIFO at the start of the port
112 if (ARDOUR::Port::sends_output()) {
113 flush_output_fifo (nframes);
116 /* copy incoming data from the port buffer into the input FIFO
117 and if necessary wakeup the reader
120 if (ARDOUR::Port::receives_input()) {
121 MidiBuffer& mb (get_midi_buffer (nframes));
127 when = AudioEngine::instance()->sample_time_at_cycle_start();
130 for (MidiBuffer::iterator b = mb.begin(); b != mb.end(); ++b) {
134 input_fifo.write (when, (Evoral::EventType) 0, (*b).size(), (*b).buffer());
144 AsyncMIDIPort::cycle_end (MIDI::pframes_t nframes)
146 if (ARDOUR::Port::sends_output()) {
147 /* move any additional data from output FIFO into the port
150 flush_output_fifo (nframes);
153 MidiPort::cycle_end (nframes);
155 _currently_in_cycle = false;
158 /** wait for the output FIFO to be emptied by successive process() callbacks.
160 * Cannot be called from a processing thread.
163 AsyncMIDIPort::drain (int check_interval_usecs)
165 RingBuffer< Evoral::Event<double> >::rw_vector vec = { { 0, 0 }, { 0, 0} };
167 if (!AudioEngine::instance()->running() || AudioEngine::instance()->session() == 0) {
168 /* no more process calls - it will never drain */
173 if (is_process_thread()) {
174 error << "Process thread called MIDI::AsyncMIDIPort::drain() - this cannot work" << endmsg;
179 output_fifo.get_write_vector (&vec);
180 if (vec.len[0] + vec.len[1] >= output_fifo.bufsize() - 1) {
183 Glib::usleep (check_interval_usecs);
188 AsyncMIDIPort::write (const MIDI::byte * msg, size_t msglen, MIDI::timestamp_t timestamp)
192 if (!ARDOUR::Port::sends_output()) {
196 if (!is_process_thread()) {
198 /* this is the best estimate of "when" this MIDI data is being
202 _parser->set_timestamp (AudioEngine::instance()->sample_time() + timestamp);
203 for (size_t n = 0; n < msglen; ++n) {
204 _parser->scanner (msg[n]);
207 Glib::Threads::Mutex::Lock lm (output_fifo_lock);
208 RingBuffer< Evoral::Event<double> >::rw_vector vec = { { 0, 0 }, { 0, 0} };
210 output_fifo.get_write_vector (&vec);
212 if (vec.len[0] + vec.len[1] < 1) {
213 error << "no space in FIFO for non-process thread MIDI write" << endmsg;
218 if (!vec.buf[0]->owns_buffer()) {
219 vec.buf[0]->set_buffer (0, 0, true);
221 vec.buf[0]->set (msg, msglen, timestamp);
223 if (!vec.buf[1]->owns_buffer()) {
224 vec.buf[1]->set_buffer (0, 0, true);
226 vec.buf[1]->set (msg, msglen, timestamp);
229 output_fifo.increment_write_idx (1);
235 _parser->set_timestamp (AudioEngine::instance()->sample_time_at_cycle_start() + timestamp);
236 for (size_t n = 0; n < msglen; ++n) {
237 _parser->scanner (msg[n]);
240 if (timestamp >= _cycle_nframes) {
241 std::cerr << "attempting to write MIDI event of " << msglen << " MIDI::bytes at time "
242 << timestamp << " of " << _cycle_nframes
243 << " (this will not work - needs a code fix)"
247 /* This is the process thread, which makes checking
248 * _currently_in_cycle atomic and safe, since it is only
249 * set from cycle_start() and cycle_end(), also called
250 * only from the process thread.
253 if (_currently_in_cycle) {
255 MidiBuffer& mb (get_midi_buffer (_cycle_nframes));
257 if (timestamp == 0) {
258 timestamp = _last_write_timestamp;
261 if (mb.push_back (timestamp, msglen, msg)) {
263 _last_write_timestamp = timestamp;
266 cerr << "AsyncMIDIPort (" << ARDOUR::Port::name() << "): write of " << msglen << " @ " << timestamp << " failed\n" << endl;
267 PBD::stacktrace (cerr, 20);
271 cerr << "write to JACK midi port failed: not currently in a process cycle." << endl;
272 PBD::stacktrace (cerr, 20);
281 AsyncMIDIPort::read (MIDI::byte *, size_t)
283 if (!ARDOUR::Port::receives_input()) {
288 Evoral::EventType type;
290 vector<MIDI::byte> buffer(input_fifo.capacity());
292 while (input_fifo.read (&time, &type, &size, &buffer[0])) {
293 _parser->set_timestamp (time);
294 for (uint32_t i = 0; i < size; ++i) {
295 _parser->scanner (buffer[i]);
303 AsyncMIDIPort::parse (MIDI::framecnt_t)
307 /* see ::read() to realize why buf is not used */
308 read (buf, sizeof (buf));
312 AsyncMIDIPort::set_process_thread (pthread_t thr)
314 _process_thread = thr;
318 AsyncMIDIPort::is_process_thread()
320 return pthread_equal (pthread_self(), _process_thread);