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.
23 #include <glibmm/timer.h>
25 #include "pbd/error.h"
26 #include "pbd/stacktrace.h"
28 #include "midi++/types.h"
30 #include "ardour/async_midi_port.h"
31 #include "ardour/audioengine.h"
32 #include "ardour/midi_buffer.h"
35 using namespace ARDOUR;
40 template class EventRingBuffer<MIDI::timestamp_t>;
43 pthread_t AsyncMIDIPort::_process_thread;
45 #define port_engine AudioEngine::instance()->port_engine()
47 AsyncMIDIPort::AsyncMIDIPort (string const & name, PortFlags flags)
48 : MidiPort (name, flags)
49 , MIDI::Port (name, MIDI::Port::Flags (0))
50 , _currently_in_cycle (false)
51 , _last_write_timestamp (0)
58 AsyncMIDIPort::~AsyncMIDIPort ()
63 AsyncMIDIPort::flush_output_fifo (MIDI::pframes_t nframes)
65 RingBuffer< Evoral::Event<double> >::rw_vector vec = { { 0, 0 }, { 0, 0 } };
68 output_fifo.get_read_vector (&vec);
70 MidiBuffer& mb (get_midi_buffer (nframes));
73 Evoral::Event<double>* evp = vec.buf[0];
75 for (size_t n = 0; n < vec.len[0]; ++n, ++evp) {
76 mb.push_back (evp->time(), evp->size(), evp->buffer());
81 Evoral::Event<double>* evp = vec.buf[1];
83 for (size_t n = 0; n < vec.len[1]; ++n, ++evp) {
84 mb.push_back (evp->time(), evp->size(), evp->buffer());
88 if ((written = vec.len[0] + vec.len[1]) != 0) {
89 output_fifo.increment_read_idx (written);
94 AsyncMIDIPort::cycle_start (MIDI::pframes_t nframes)
96 _currently_in_cycle = true;
97 MidiPort::cycle_start (nframes);
99 /* dump anything waiting in the output FIFO at the start of the port
103 if (ARDOUR::Port::sends_output()) {
104 flush_output_fifo (nframes);
107 /* copy incoming data from the port buffer into the input FIFO
108 and if necessary wakeup the reader
111 if (ARDOUR::Port::receives_input()) {
112 MidiBuffer& mb (get_midi_buffer (nframes));
113 pframes_t when = AudioEngine::instance()->sample_time_at_cycle_start();
115 for (MidiBuffer::iterator b = mb.begin(); b != mb.end(); ++b) {
116 input_fifo.write (when, (Evoral::EventType) 0, (*b).size(), (*b).buffer());
127 AsyncMIDIPort::cycle_end (MIDI::pframes_t nframes)
129 if (ARDOUR::Port::sends_output()) {
130 /* move any additional data from output FIFO into the port
133 flush_output_fifo (nframes);
136 MidiPort::cycle_end (nframes);
138 _currently_in_cycle = false;
141 /** wait for the output FIFO to be emptied by successive process() callbacks.
143 * Cannot be called from a processing thread.
146 AsyncMIDIPort::drain (int check_interval_usecs)
148 RingBuffer< Evoral::Event<double> >::rw_vector vec = { { 0, 0 }, { 0, 0} };
150 if (!AudioEngine::instance()->running() || AudioEngine::instance()->session() == 0) {
151 /* no more process calls - it will never drain */
156 if (is_process_thread()) {
157 error << "Process thread called MIDI::AsyncMIDIPort::drain() - this cannot work" << endmsg;
162 output_fifo.get_write_vector (&vec);
163 if (vec.len[0] + vec.len[1] >= output_fifo.bufsize() - 1) {
166 Glib::usleep (check_interval_usecs);
171 AsyncMIDIPort::write (const MIDI::byte * msg, size_t msglen, MIDI::timestamp_t timestamp)
175 if (!ARDOUR::Port::sends_output()) {
179 if (!is_process_thread()) {
181 /* this is the best estimate of "when" this MIDI data is being
185 _parser->set_timestamp (AudioEngine::instance()->sample_time() + timestamp);
186 for (size_t n = 0; n < msglen; ++n) {
187 _parser->scanner (msg[n]);
190 Glib::Threads::Mutex::Lock lm (output_fifo_lock);
191 RingBuffer< Evoral::Event<double> >::rw_vector vec = { { 0, 0 }, { 0, 0} };
193 output_fifo.get_write_vector (&vec);
195 if (vec.len[0] + vec.len[1] < 1) {
196 error << "no space in FIFO for non-process thread MIDI write" << endmsg;
201 if (!vec.buf[0]->owns_buffer()) {
202 vec.buf[0]->set_buffer (0, 0, true);
204 vec.buf[0]->set (msg, msglen, timestamp);
206 if (!vec.buf[1]->owns_buffer()) {
207 vec.buf[1]->set_buffer (0, 0, true);
209 vec.buf[1]->set (msg, msglen, timestamp);
212 output_fifo.increment_write_idx (1);
218 _parser->set_timestamp (AudioEngine::instance()->sample_time_at_cycle_start() + timestamp);
219 for (size_t n = 0; n < msglen; ++n) {
220 _parser->scanner (msg[n]);
223 if (timestamp >= _cycle_nframes) {
224 std::cerr << "attempting to write MIDI event of " << msglen << " MIDI::bytes at time "
225 << timestamp << " of " << _cycle_nframes
226 << " (this will not work - needs a code fix)"
230 /* This is the process thread, which makes checking
231 * _currently_in_cycle atomic and safe, since it is only
232 * set from cycle_start() and cycle_end(), also called
233 * only from the process thread.
236 if (_currently_in_cycle) {
238 MidiBuffer& mb (get_midi_buffer (_cycle_nframes));
240 if (timestamp == 0) {
241 timestamp = _last_write_timestamp;
244 if (mb.push_back (timestamp, msglen, msg)) {
246 _last_write_timestamp = timestamp;
249 cerr << "AsyncMIDIPort (" << ARDOUR::Port::name() << "): write of " << msglen << " @ " << timestamp << " failed\n" << endl;
250 PBD::stacktrace (cerr, 20);
254 cerr << "write to JACK midi port failed: not currently in a process cycle." << endl;
255 PBD::stacktrace (cerr, 20);
264 AsyncMIDIPort::read (MIDI::byte *, size_t)
266 if (!ARDOUR::Port::receives_input()) {
271 Evoral::EventType type;
273 MIDI::byte buffer[input_fifo.capacity()];
275 while (input_fifo.read (&time, &type, &size, buffer)) {
276 _parser->set_timestamp (time);
277 for (uint32_t i = 0; i < size; ++i) {
278 _parser->scanner (buffer[i]);
286 AsyncMIDIPort::parse (MIDI::framecnt_t)
290 /* see ::read() to realize why buf is not used */
291 read (buf, sizeof (buf));
295 AsyncMIDIPort::set_process_thread (pthread_t thr)
297 _process_thread = thr;
301 AsyncMIDIPort::is_process_thread()
303 return pthread_equal (pthread_self(), _process_thread);