incomplete merge of master into windows (requires upcoming changes to master to be complete)

1 files changed, 303 insertions, 0 deletions

diff --git a/libs/ardour/async_midi_port.cc b/libs/ardour/async_midi_port.cc
new file mode 100644
index 0000000000..77ca62961e
--- /dev/null
+++ b/libs/ardour/async_midi_port.cc
@@ -0,0 +1,303 @@
+/*
+    Copyright (C) 1998 Paul Barton-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.
+
+    $Id$
+*/
+
+#include <iostream>
+
+#include "pbd/error.h"
+#include "pbd/stacktrace.h"
+
+#include "midi++/types.h"
+
+#include "ardour/async_midi_port.h"
+#include "ardour/audioengine.h"
+#include "ardour/midi_buffer.h"
+
+using namespace MIDI;
+using namespace ARDOUR;
+using namespace std;
+using namespace PBD;
+
+namespace Evoral {
+	template class EventRingBuffer<MIDI::timestamp_t>;
+}
+
+pthread_t AsyncMIDIPort::_process_thread;
+
+#define port_engine AudioEngine::instance()->port_engine()
+
+AsyncMIDIPort::AsyncMIDIPort (string const & name, PortFlags flags)
+	: MidiPort (name, flags)
+	, MIDI::Port (name, MIDI::Port::Flags (0))
+	, _currently_in_cycle (false)
+	, _last_write_timestamp (0)
+	, output_fifo (512)
+	, input_fifo (1024)
+	, xthread (true)
+{
+}
+
+AsyncMIDIPort::~AsyncMIDIPort ()
+{
+}
+
+void
+AsyncMIDIPort::flush_output_fifo (pframes_t nframes)
+{
+	RingBuffer< Evoral::Event<double> >::rw_vector vec = { { 0, 0 }, { 0, 0 } };
+	size_t written;
+
+	output_fifo.get_read_vector (&vec);
+
+	MidiBuffer& mb (get_midi_buffer (nframes));
+			
+	if (vec.len[0]) {
+		Evoral::Event<double>* evp = vec.buf[0];
+		
+		for (size_t n = 0; n < vec.len[0]; ++n, ++evp) {
+			mb.push_back (evp->time(), evp->size(), evp->buffer());
+		}
+	}
+	
+	if (vec.len[1]) {
+		Evoral::Event<double>* evp = vec.buf[1];
+
+		for (size_t n = 0; n < vec.len[1]; ++n, ++evp) {
+			mb.push_back (evp->time(), evp->size(), evp->buffer());
+		}
+	}
+	
+	if ((written = vec.len[0] + vec.len[1]) != 0) {
+		output_fifo.increment_read_idx (written);
+	}
+}
+
+void
+AsyncMIDIPort::cycle_start (pframes_t nframes)
+{
+	_currently_in_cycle = true;
+	MidiPort::cycle_start (nframes);
+
+	/* dump anything waiting in the output FIFO at the start of the port
+	 * buffer
+	 */
+
+	if (ARDOUR::Port::sends_output()) {
+		flush_output_fifo (nframes);
+	} 
+	
+	/* copy incoming data from the port buffer into the input FIFO
+	   and if necessary wakeup the reader
+	*/
+
+	if (ARDOUR::Port::receives_input()) {
+		MidiBuffer& mb (get_midi_buffer (nframes));
+		pframes_t when = AudioEngine::instance()->sample_time_at_cycle_start();
+
+		for (MidiBuffer::iterator b = mb.begin(); b != mb.end(); ++b) {
+			input_fifo.write (when, (Evoral::EventType) 0, (*b).size(), (*b).buffer());
+		}
+		
+		if (!mb.empty()) {
+			xthread.wakeup ();
+		}
+	}
+
+}
+
+void
+AsyncMIDIPort::cycle_end (pframes_t nframes)
+{
+	if (ARDOUR::Port::sends_output()) {
+		/* move any additional data from output FIFO into the port
+		   buffer.
+		*/
+		flush_output_fifo (nframes);
+	}
+
+	MidiPort::cycle_end (nframes);
+
+	_currently_in_cycle = false;
+}
+
+/** wait for the output FIFO to be emptied by successive process() callbacks.
+ *
+ * Cannot be called from a processing thread.
+ */
+void
+AsyncMIDIPort::drain (int check_interval_usecs)
+{
+	RingBuffer< Evoral::Event<double> >::rw_vector vec = { { 0, 0 }, { 0, 0} };
+
+	if (!AudioEngine::instance()->running() || AudioEngine::instance()->session() == 0) {
+		/* no more process calls - it will never drain */
+		return;
+	}
+
+
+	if (is_process_thread()) {
+		error << "Process thread called MIDI::AsyncMIDIPort::drain() - this cannot work" << endmsg;
+		return;
+	}
+
+	while (1) {
+		output_fifo.get_write_vector (&vec);
+		if (vec.len[0] + vec.len[1] >= output_fifo.bufsize() - 1) {
+			break;
+		}
+		usleep (check_interval_usecs);
+	}
+}
+
+int
+AsyncMIDIPort::write (const MIDI::byte * msg, size_t msglen, MIDI::timestamp_t timestamp)
+{
+	int ret = 0;
+
+	if (!ARDOUR::Port::sends_output()) {
+		return ret;
+	}
+
+	if (!is_process_thread()) {
+
+		/* this is the best estimate of "when" this MIDI data is being
+		 * delivered
+		 */
+		
+		_parser->set_timestamp (AudioEngine::instance()->sample_time() + timestamp);
+		for (size_t n = 0; n < msglen; ++n) {
+			_parser->scanner (msg[n]);
+		}
+
+		Glib::Threads::Mutex::Lock lm (output_fifo_lock);
+		RingBuffer< Evoral::Event<double> >::rw_vector vec = { { 0, 0 }, { 0, 0} };
+		
+		output_fifo.get_write_vector (&vec);
+
+		if (vec.len[0] + vec.len[1] < 1) {
+			error << "no space in FIFO for non-process thread MIDI write" << endmsg;
+			return 0;
+		}
+
+		if (vec.len[0]) {
+                        if (!vec.buf[0]->owns_buffer()) {
+                                vec.buf[0]->set_buffer (0, 0, true);
+                        }
+			vec.buf[0]->set (msg, msglen, timestamp);
+		} else {
+                        if (!vec.buf[1]->owns_buffer()) {
+                                vec.buf[1]->set_buffer (0, 0, true);
+                        }
+			vec.buf[1]->set (msg, msglen, timestamp);
+		}
+
+		output_fifo.increment_write_idx (1);
+		
+		ret = msglen;
+
+	} else {
+
+		_parser->set_timestamp (AudioEngine::instance()->sample_time_at_cycle_start() + timestamp);
+		for (size_t n = 0; n < msglen; ++n) {
+			_parser->scanner (msg[n]);
+		}
+
+		if (timestamp >= _cycle_nframes) {
+			std::cerr << "attempting to write MIDI event of " << msglen << " MIDI::bytes at time "
+				  << timestamp << " of " << _cycle_nframes
+				  << " (this will not work - needs a code fix)"
+				  << std::endl;
+		}
+
+		/* This is the process thread, which makes checking
+		 * _currently_in_cycle atomic and safe, since it is only
+		 * set from cycle_start() and cycle_end(), also called
+		 * only from the process thread.
+		 */
+
+		if (_currently_in_cycle) {
+
+			MidiBuffer& mb (get_midi_buffer (_cycle_nframes));
+			
+			if (timestamp == 0) {
+				timestamp = _last_write_timestamp;
+			} 
+			
+			if (mb.push_back (timestamp, msglen, msg)) {
+				ret = msglen;
+				_last_write_timestamp = timestamp;
+
+			} else {
+				cerr << "AsyncMIDIPort (" << ARDOUR::Port::name() << "): write of " << msglen << " @ " << timestamp << " failed\n" << endl;
+				PBD::stacktrace (cerr, 20);
+				ret = 0;
+			}
+		} else {
+			cerr << "write to JACK midi port failed: not currently in a process cycle." << endl;
+			PBD::stacktrace (cerr, 20);
+		}
+	}
+
+	return ret;
+}
+
+
+int
+AsyncMIDIPort::read (MIDI::byte *, size_t)
+{
+	if (!ARDOUR::Port::receives_input()) {
+		return 0;
+	}
+	
+	timestamp_t time;
+	Evoral::EventType type;
+	uint32_t size;
+	MIDI::byte buffer[input_fifo.capacity()];
+
+	while (input_fifo.read (&time, &type, &size, buffer)) {
+		_parser->set_timestamp (time);
+		for (uint32_t i = 0; i < size; ++i) {
+			_parser->scanner (buffer[i]);
+		}
+	}
+
+	return 0;
+}
+
+void
+AsyncMIDIPort::parse (framecnt_t)
+{
+	MIDI::byte buf[1];
+
+	/* see ::read() to realize why buf is not used */
+	read (buf, sizeof (buf));
+}
+
+void
+AsyncMIDIPort::set_process_thread (pthread_t thr)
+{
+	_process_thread = thr;
+}
+
+bool
+AsyncMIDIPort::is_process_thread()
+{
+	return pthread_equal (pthread_self(), _process_thread);
+}
+