add new files (code based on the old midi++ JACKMidiPort)
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79
libs/ardour/ardour/async_midi_port.h
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79
libs/ardour/ardour/async_midi_port.h
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/*
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Copyright (C) 1998-2010 Paul Barton-Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __libardour_async_midiport_h__
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#define __libardour_async_midiport_h__
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#include <string>
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#include <iostream>
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#include "pbd/xml++.h"
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#include "pbd/crossthread.h"
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#include "pbd/signals.h"
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#include "pbd/ringbuffer.h"
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#include "evoral/Event.hpp"
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#include "evoral/EventRingBuffer.hpp"
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#include "midi++/types.h"
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#include "midi++/parser.h"
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#include "midi++/port.h"
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#include "ardour/midi_port.h"
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namespace ARDOUR {
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class AsyncMIDIPort : public ARDOUR::MidiPort, public MIDI::Port {
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public:
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AsyncMIDIPort (std::string const &, PortFlags);
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~AsyncMIDIPort ();
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/* called from an RT context */
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void cycle_start (pframes_t nframes);
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void cycle_end (pframes_t nframes);
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/* called from non-RT context */
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void parse (framecnt_t timestamp);
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int write (const MIDI::byte *msg, size_t msglen, MIDI::timestamp_t timestamp);
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int read (MIDI::byte *buf, size_t bufsize);
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void drain (int check_interval_usecs);
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int selectable () const { return xthread.selectable(); }
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static void set_process_thread (pthread_t);
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static pthread_t get_process_thread () { return _process_thread; }
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static bool is_process_thread();
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private:
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bool _currently_in_cycle;
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MIDI::timestamp_t _last_write_timestamp;
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RingBuffer< Evoral::Event<double> > output_fifo;
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Evoral::EventRingBuffer<MIDI::timestamp_t> input_fifo;
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Glib::Threads::Mutex output_fifo_lock;
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CrossThreadChannel xthread;
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void flush_output_fifo (pframes_t);
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static pthread_t _process_thread;
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};
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} // namespace ARDOUR
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#endif /* __libardour_async_midiport_h__ */
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297
libs/ardour/async_midi_port.cc
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297
libs/ardour/async_midi_port.cc
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/*
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Copyright (C) 1998 Paul Barton-Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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$Id$
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*/
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#include <iostream>
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#include "pbd/error.h"
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#include "pbd/stacktrace.h"
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#include "midi++/types.h"
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#include "ardour/async_midi_port.h"
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#include "ardour/audioengine.h"
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#include "ardour/midi_buffer.h"
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using namespace MIDI;
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using namespace ARDOUR;
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using namespace std;
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using namespace PBD;
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namespace Evoral {
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template class EventRingBuffer<timestamp_t>;
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}
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pthread_t AsyncMIDIPort::_process_thread;
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#define port_engine AudioEngine::instance()->port_engine()
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AsyncMIDIPort::AsyncMIDIPort (string const & name, PortFlags flags)
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: MidiPort (name, flags)
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, MIDI::Port (name, MIDI::Port::Flags (0))
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, _currently_in_cycle (false)
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, _last_write_timestamp (0)
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, output_fifo (512)
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, input_fifo (1024)
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, xthread (true)
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{
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}
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AsyncMIDIPort::~AsyncMIDIPort ()
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{
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}
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void
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AsyncMIDIPort::flush_output_fifo (pframes_t nframes)
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{
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RingBuffer< Evoral::Event<double> >::rw_vector vec = { { 0, 0 }, { 0, 0 } };
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size_t written;
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output_fifo.get_read_vector (&vec);
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MidiBuffer& mb (get_midi_buffer (nframes));
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if (vec.len[0]) {
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Evoral::Event<double>* evp = vec.buf[0];
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for (size_t n = 0; n < vec.len[0]; ++n, ++evp) {
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mb.push_back (evp->time(), evp->size(), evp->buffer());
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}
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}
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if (vec.len[1]) {
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Evoral::Event<double>* evp = vec.buf[1];
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for (size_t n = 0; n < vec.len[1]; ++n, ++evp) {
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mb.push_back (evp->time(), evp->size(), evp->buffer());
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}
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}
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if ((written = vec.len[0] + vec.len[1]) != 0) {
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output_fifo.increment_read_idx (written);
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}
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}
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void
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AsyncMIDIPort::cycle_start (pframes_t nframes)
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{
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_currently_in_cycle = true;
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MidiPort::cycle_start (nframes);
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/* dump anything waiting in the output FIFO at the start of the port
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* buffer
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*/
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if (ARDOUR::Port::sends_output()) {
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flush_output_fifo (nframes);
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}
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/* copy incoming data from the port buffer into the input FIFO
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and if necessary wakeup the reader
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*/
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if (ARDOUR::Port::receives_input()) {
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MidiBuffer& mb (get_midi_buffer (nframes));
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pframes_t when = AudioEngine::instance()->sample_time_at_cycle_start();
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for (MidiBuffer::iterator b = mb.begin(); b != mb.end(); ++b) {
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input_fifo.write (when, (Evoral::EventType) 0, (*b).size(), (*b).buffer());
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}
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if (!mb.empty()) {
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xthread.wakeup ();
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}
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}
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}
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void
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AsyncMIDIPort::cycle_end (pframes_t nframes)
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{
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if (ARDOUR::Port::sends_output()) {
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/* move any additional data from output FIFO into the port
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buffer.
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*/
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flush_output_fifo (nframes);
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}
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MidiPort::cycle_end (nframes);
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_currently_in_cycle = false;
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}
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/** wait for the output FIFO to be emptied by successive process() callbacks.
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*
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* Cannot be called from a processing thread.
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*/
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void
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AsyncMIDIPort::drain (int check_interval_usecs)
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{
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RingBuffer< Evoral::Event<double> >::rw_vector vec = { { 0, 0 }, { 0, 0} };
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if (is_process_thread()) {
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error << "Process thread called MIDI::AsyncMIDIPort::drain() - this cannot work" << endmsg;
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return;
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}
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while (1) {
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output_fifo.get_write_vector (&vec);
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if (vec.len[0] + vec.len[1] >= output_fifo.bufsize() - 1) {
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break;
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}
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usleep (check_interval_usecs);
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}
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}
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int
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AsyncMIDIPort::write (const byte * msg, size_t msglen, timestamp_t timestamp)
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{
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int ret = 0;
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if (!ARDOUR::Port::sends_output()) {
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return ret;
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}
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if (!is_process_thread()) {
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/* this is the best estimate of "when" this MIDI data is being
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* delivered
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*/
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_parser->set_timestamp (AudioEngine::instance()->sample_time() + timestamp);
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for (size_t n = 0; n < msglen; ++n) {
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_parser->scanner (msg[n]);
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}
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Glib::Threads::Mutex::Lock lm (output_fifo_lock);
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RingBuffer< Evoral::Event<double> >::rw_vector vec = { { 0, 0 }, { 0, 0} };
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output_fifo.get_write_vector (&vec);
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if (vec.len[0] + vec.len[1] < 1) {
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error << "no space in FIFO for non-process thread MIDI write" << endmsg;
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return 0;
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}
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if (vec.len[0]) {
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if (!vec.buf[0]->owns_buffer()) {
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vec.buf[0]->set_buffer (0, 0, true);
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}
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vec.buf[0]->set (msg, msglen, timestamp);
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} else {
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if (!vec.buf[1]->owns_buffer()) {
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vec.buf[1]->set_buffer (0, 0, true);
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}
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vec.buf[1]->set (msg, msglen, timestamp);
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}
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output_fifo.increment_write_idx (1);
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ret = msglen;
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} else {
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_parser->set_timestamp (AudioEngine::instance()->sample_time_at_cycle_start() + timestamp);
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for (size_t n = 0; n < msglen; ++n) {
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_parser->scanner (msg[n]);
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}
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if (timestamp >= _cycle_nframes) {
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std::cerr << "attempting to write MIDI event of " << msglen << " bytes at time "
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<< timestamp << " of " << _cycle_nframes
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<< " (this will not work - needs a code fix)"
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<< std::endl;
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}
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/* This is the process thread, which makes checking
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* _currently_in_cycle atomic and safe, since it is only
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* set from cycle_start() and cycle_end(), also called
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* only from the process thread.
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*/
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if (_currently_in_cycle) {
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MidiBuffer& mb (get_midi_buffer (_cycle_nframes));
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if (timestamp == 0) {
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timestamp = _last_write_timestamp;
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}
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if (mb.push_back (timestamp, msglen, msg)) {
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ret = msglen;
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_last_write_timestamp = timestamp;
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} else {
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cerr << "AsyncMIDIPort (" << ARDOUR::Port::name() << "): write of " << msglen << " @ " << timestamp << " failed\n" << endl;
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PBD::stacktrace (cerr, 20);
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ret = 0;
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}
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} else {
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cerr << "write to JACK midi port failed: not currently in a process cycle." << endl;
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PBD::stacktrace (cerr, 20);
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}
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}
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return ret;
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}
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int
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AsyncMIDIPort::read (MIDI::byte *, size_t)
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{
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if (!ARDOUR::Port::receives_input()) {
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return 0;
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}
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timestamp_t time;
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Evoral::EventType type;
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uint32_t size;
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byte buffer[input_fifo.capacity()];
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while (input_fifo.read (&time, &type, &size, buffer)) {
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_parser->set_timestamp (time);
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for (uint32_t i = 0; i < size; ++i) {
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_parser->scanner (buffer[i]);
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}
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}
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return 0;
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}
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void
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AsyncMIDIPort::parse (framecnt_t)
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{
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MIDI::byte buf[1];
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/* see ::read() to realize why buf is not used */
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read (buf, sizeof (buf));
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}
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void
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AsyncMIDIPort::set_process_thread (pthread_t thr)
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{
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_process_thread = thr;
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}
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bool
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AsyncMIDIPort::is_process_thread()
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{
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return pthread_equal (pthread_self(), _process_thread);
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}
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