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session_midi.cc

/*
  Copyright (C) 1999-2002 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.

  $Id: session_midi.cc,v 1.58 2006/01/12 18:18:14 persigmond Exp $
*/

#include <string>
#include <cmath>
#include <cerrno>
#include <unistd.h>
#include <fcntl.h>
#include <poll.h>

#include <midi++/mmc.h>
#include <midi++/port.h>
#include <midi++/manager.h>
#include <pbd/error.h>
#include <pbd/lockmonitor.h>
#include <pbd/pthread_utils.h>

#include <ardour/configuration.h>
#include <ardour/audioengine.h>
#include <ardour/session.h>
#include <ardour/audio_track.h>
#include <ardour/diskstream.h>
#include <ardour/slave.h>
#include <ardour/cycles.h>

#include "i18n.h"

using namespace std;
using namespace ARDOUR;
using namespace SigC;
using namespace MIDI;

MachineControl::CommandSignature MMC_CommandSignature;
MachineControl::ResponseSignature MMC_ResponseSignature;

MultiAllocSingleReleasePool Session::MIDIRequest::pool ("midi", sizeof (Session::MIDIRequest), 1024);

int
Session::use_config_midi_ports ()
{
      string port_name;

      if (default_mmc_port) {
            set_mmc_port (default_mmc_port->name());
      } else {
            set_mmc_port ("");
      }

      if (default_mtc_port) {
            set_mtc_port (default_mtc_port->name());
      } else {
            set_mtc_port ("");
      }

      if (default_midi_port) {
            set_midi_port (default_midi_port->name());
      } else {
            set_midi_port ("");
      }

      return 0;
}     


/***********************************************************************
 MTC, MMC, etc.
**********************************************************************/

void
Session::set_mmc_control (bool yn)
{
      if (mmc_control == yn) {
            return;
      }
      
      mmc_control = yn;
      set_dirty();
      poke_midi_thread ();
      
      ControlChanged (MMCControl); /* EMIT SIGNAL */
}

void
Session::set_midi_control (bool yn)
{
      if (midi_control == yn) {
            return;
      }

      midi_control = yn;
      set_dirty();
      poke_midi_thread ();

      if (_midi_port) {
            RWLockMonitor lm (route_lock, false, __LINE__, __FILE__);
            for (RouteList::iterator i = routes.begin(); i != routes.end(); ++i) {
                  (*i)->reset_midi_control (_midi_port, midi_control);
            }
      }

      ControlChanged (MidiControl); /* EMIT SIGNAL */
}

void
Session::set_send_mtc (bool yn)
{
      /* set the persistent option value regardless */

      send_midi_timecode = yn;
      set_dirty();

      /* only set the internal flag if we have
         a port.
      */

      if (_mtc_port == 0 || send_mtc == yn) {
            return;
      }

      send_mtc = yn;
      ControlChanged (SendMTC); /* EMIT SIGNAL */
}

void
Session::set_send_mmc (bool yn)
{
      if (_mmc_port == 0) {
            return;
      }

      if (send_midi_machine_control == yn) {
            return;
      }

      /* only set the internal flag if we have
         a port.
      */

      if (_mmc_port) {
            send_mmc = yn;
      }

      /* set the persistent option value regardless */

      send_midi_machine_control = yn;
      set_dirty();

      ControlChanged (SendMMC); /* EMIT SIGNAL */
}

bool
Session::get_send_mtc () const
{
      return send_mtc;
}

bool
Session::get_send_mmc () const
{
      return send_mmc;
}

int
Session::set_mtc_port (string port_tag)
{
      MTC_Slave *ms;

      if (port_tag.length() == 0) {

            if (_slave && ((ms = dynamic_cast<MTC_Slave*> (_slave)) != 0)) {
                  error << _("Ardour is slaved to MTC - port cannot be reset") << endmsg;
                  return -1;
            }

            if (_mtc_port == 0) {
                  return 0;
            }

            _mtc_port = 0;
            goto out;
      }

      MIDI::Port* port;

      if ((port = MIDI::Manager::instance()->port (port_tag)) == 0) {
            error << compose (_("unknown port %1 requested for MTC"), port_tag) << endl;
            return -1;
      }

      _mtc_port = port;

      if (_slave && ((ms = dynamic_cast<MTC_Slave*> (_slave)) != 0)) {
            ms->rebind (*port);
      }

      Config->set_mtc_port_name (port_tag);

  out:
      MTC_PortChanged(); /* EMIT SIGNAL */
      change_midi_ports ();
      set_dirty();
      return 0;
}

int
Session::set_mmc_port (string port_tag)
{
      if (port_tag.length() == 0) {
            if (_mmc_port == 0) {
                  return 0;
            }
            _mmc_port = 0;
            goto out;
      }

      MIDI::Port* port;

      if ((port = MIDI::Manager::instance()->port (port_tag)) == 0) {
            return -1;
      }

      _mmc_port = port;

      if (mmc) {
            delete mmc;
      }

      mmc = new MIDI::MachineControl (*_mmc_port, 1.0, 
                              MMC_CommandSignature,
                              MMC_ResponseSignature);


      mmc->Play.connect 
            (slot (*this, &Session::mmc_deferred_play));
      mmc->DeferredPlay.connect 
            (slot (*this, &Session::mmc_deferred_play));
      mmc->Stop.connect 
            (slot (*this, &Session::mmc_stop));
      mmc->FastForward.connect 
            (slot (*this, &Session::mmc_fast_forward));
      mmc->Rewind.connect 
            (slot (*this, &Session::mmc_rewind));
      mmc->Pause.connect 
            (slot (*this, &Session::mmc_pause));
      mmc->RecordPause.connect 
            (slot (*this, &Session::mmc_record_pause));
      mmc->RecordStrobe.connect 
            (slot (*this, &Session::mmc_record_strobe));
      mmc->RecordExit.connect 
            (slot (*this, &Session::mmc_record_exit));
      mmc->Locate.connect 
            (slot (*this, &Session::mmc_locate));
      mmc->Step.connect 
            (slot (*this, &Session::mmc_step));
      mmc->Shuttle.connect 
            (slot (*this, &Session::mmc_shuttle));
      mmc->TrackRecordStatusChange.connect
            (slot (*this, &Session::mmc_record_enable));

      /* also handle MIDI SPP because its so common */

      _mmc_port->input()->start.connect (slot (*this, &Session::spp_start));
      _mmc_port->input()->contineu.connect (slot (*this, &Session::spp_continue));
      _mmc_port->input()->stop.connect (slot (*this, &Session::spp_stop));
      
      Config->set_mmc_port_name (port_tag);

  out:
      MMC_PortChanged(); /* EMIT SIGNAL */
      change_midi_ports ();
      set_dirty();
      return 0;
}

int
Session::set_midi_port (string port_tag)
{
      if (port_tag.length() == 0) {
            if (_midi_port == 0) {
                  return 0;
            }
            _midi_port = 0;
            goto out;
      }

      MIDI::Port* port;

      if ((port = MIDI::Manager::instance()->port (port_tag)) == 0) {
            return -1;
      }

      _midi_port = port;

      Config->set_midi_port_name (port_tag);

  out:
      MIDI_PortChanged(); /* EMIT SIGNAL */
      change_midi_ports ();
      set_dirty();
      return 0;
}

void
Session::set_trace_midi_input (bool yn, MIDI::Port* port)
{
      MIDI::Parser* input_parser;

      if (port) {
            if ((input_parser = port->input()) != 0) {
                  input_parser->trace (yn, &cout, "input: ");
            }
      } else {

            if (_mmc_port) {
                  if ((input_parser = _mmc_port->input()) != 0) {
                        input_parser->trace (yn, &cout, "input: ");
                  }
            }
            
            if (_mtc_port && _mtc_port != _mmc_port) {
                  if ((input_parser = _mtc_port->input()) != 0) {
                        input_parser->trace (yn, &cout, "input: ");
                  }
            }

            if (_midi_port && _midi_port != _mmc_port && _midi_port != _mtc_port  ) {
                  if ((input_parser = _midi_port->input()) != 0) {
                        input_parser->trace (yn, &cout, "input: ");
                  }
            }
      }

      Config->set_trace_midi_input (yn);
}

void
Session::set_trace_midi_output (bool yn, MIDI::Port* port)
{
      MIDI::Parser* output_parser;

      if (port) {
            if ((output_parser = port->output()) != 0) {
                  output_parser->trace (yn, &cout, "output: ");
            }
      } else {
            if (_mmc_port) {
                  if ((output_parser = _mmc_port->output()) != 0) {
                        output_parser->trace (yn, &cout, "output: ");
                  }
            }
            
            if (_mtc_port && _mtc_port != _mmc_port) {
                  if ((output_parser = _mtc_port->output()) != 0) {
                        output_parser->trace (yn, &cout, "output: ");
                  }
            }

            if (_midi_port && _midi_port != _mmc_port && _midi_port != _mtc_port  ) {
                  if ((output_parser = _midi_port->output()) != 0) {
                        output_parser->trace (yn, &cout, "output: ");
                  }
            }

      }

      Config->set_trace_midi_output (yn);
}

bool
Session::get_trace_midi_input(MIDI::Port *port)
{
      MIDI::Parser* input_parser;
      if (port) {
            if ((input_parser = port->input()) != 0) {
                  return input_parser->tracing();
            }
      }
      else {
            if (_mmc_port) {
                  if ((input_parser = _mmc_port->input()) != 0) {
                        return input_parser->tracing();
                  }
            }
            
            if (_mtc_port) {
                  if ((input_parser = _mtc_port->input()) != 0) {
                        return input_parser->tracing();
                  }
            }

            if (_midi_port) {
                  if ((input_parser = _midi_port->input()) != 0) {
                        return input_parser->tracing();
                  }
            }
      }

      return false;
}

bool
Session::get_trace_midi_output(MIDI::Port *port)
{
      MIDI::Parser* output_parser;
      if (port) {
            if ((output_parser = port->output()) != 0) {
                  return output_parser->tracing();
            }
      }
      else {
            if (_mmc_port) {
                  if ((output_parser = _mmc_port->output()) != 0) {
                        return output_parser->tracing();
                  }
            }
            
            if (_mtc_port) {
                  if ((output_parser = _mtc_port->output()) != 0) {
                        return output_parser->tracing();
                  }
            }

            if (_midi_port) {
                  if ((output_parser = _midi_port->output()) != 0) {
                        return output_parser->tracing();
                  }
            }
      }

      return false;

}


void
Session::set_midi_feedback (bool yn)
{
      if (_midi_port == 0) {
            return;
      }
      
      midi_feedback = yn;
      set_dirty();

      if (yn) {
            /* make sure the feedback thread is alive */
            start_feedback ();
      } else {
            /* maybe put the feedback thread to sleep */
            stop_feedback ();
      }

      ControlChanged (MidiFeedback); /* EMIT SIGNAL */

      send_all_midi_feedback ();
}

void
Session::send_all_midi_feedback ()
{
      if (midi_feedback) {
            // send out current state of all routes
            RWLockMonitor lm (route_lock, false, __LINE__, __FILE__);
            for (RouteList::iterator i = routes.begin(); i != routes.end(); ++i) {
                  (*i)->send_all_midi_feedback ();
            }
      }
}

void
Session::setup_midi_control ()
{
      outbound_mtc_smpte_frame = 0;
      next_quarter_frame_to_send = -1;

      /* setup the MMC buffer */
      
      mmc_buffer[0] = 0xf0; // SysEx
      mmc_buffer[1] = 0x7f; // Real Time SysEx ID for MMC
      mmc_buffer[2] = 0x7f; // "broadcast" device ID
      mmc_buffer[3] = 0x6;  // MCC

      /* Set up the qtr frame message */
      
      mtc_msg[0] = 0xf1;
      mtc_msg[2] = 0xf1;
      mtc_msg[4] = 0xf1;
      mtc_msg[6] = 0xf1;
      mtc_msg[8] = 0xf1;
      mtc_msg[10] = 0xf1;
      mtc_msg[12] = 0xf1;
      mtc_msg[14] = 0xf1;

      if (_mmc_port != 0) {

            send_mmc = send_midi_machine_control;

      } else {

            mmc = 0;
            send_mmc = false;
      }

      if (_mtc_port != 0) {

            send_mtc = send_midi_timecode;

      } else {

            send_mtc = false;
      }
}

int
Session::midi_read (MIDI::Port* port)
{
      MIDI::byte buf[512];
      
      /* reading from the MIDI port activates the Parser
         that in turn generates signals that we care
         about. the port is already set to NONBLOCK so that
         can read freely here.
      */
      
      while (1) {
            
            // cerr << "+++ READ ON " << port->name() << endl;
            
            int nread = port->read (buf, sizeof (buf));

            // cerr << "-- READ (" << nread << " ON " << port->name() << endl;
            
            if (nread > 0) {
                  if ((size_t) nread < sizeof (buf)) {
                        break;
                  } else {
                        continue;
                  }
            } else if (nread == 0) {
                  break;
            } else if (errno == EAGAIN) {
                  break;
            } else {
                  fatal << compose(_("Error reading from MIDI port %1"), port->name()) << endmsg;
                  /*NOTREACHED*/
            }
      }

      return 0;
}

void
Session::spp_start (Parser& ignored)
{
      if (mmc_control && (_slave_type != MTC)) {
            request_transport_speed (1.0);
      }
}

void
Session::spp_continue (Parser& ignored)
{
      spp_start (ignored);
}

void
Session::spp_stop (Parser& ignored)
{
      if (mmc_control) {
            request_stop ();
      }
}

void
Session::mmc_deferred_play (MIDI::MachineControl &mmc)
{
      if (mmc_control && (_slave_type != MTC)) {
            request_transport_speed (1.0);
      }
}

void
Session::mmc_record_pause (MIDI::MachineControl &mmc)
{
      if (mmc_control) {
            maybe_enable_record();
      }
}

void
Session::mmc_record_strobe (MIDI::MachineControl &mmc)
{
      if (!mmc_control) 
            return;

      /* record strobe does an implicit "Play" command */

      if (_transport_speed != 1.0) {

            /* start_transport() will move from Enabled->Recording, so we
               don't need to do anything here except enable recording.
               its not the same as maybe_enable_record() though, because
               that *can* switch to Recording, which we do not want.
            */
            
            save_state ("", true);
            atomic_set (&_record_status, Enabled);
            RecordEnabled (); /* EMIT SIGNAL */
            
            request_transport_speed (1.0);

      } else {

            enable_record ();
      }
}

void
Session::mmc_record_exit (MIDI::MachineControl &mmc)
{
      if (mmc_control) {
            disable_record ();
      }
}

void
Session::mmc_stop (MIDI::MachineControl &mmc)
{
      if (mmc_control) {
            request_stop ();
      }
}

void
Session::mmc_pause (MIDI::MachineControl &mmc)
{
      if (mmc_control) {

            /* We support RECORD_PAUSE, so the spec says that
               we must interpret PAUSE like RECORD_PAUSE if
               recording.
            */

            if (actively_recording()) {
                  maybe_enable_record ();
            } else {
                  request_stop ();
            }
      }
}

static bool step_queued = false;

void

Session::mmc_step (MIDI::MachineControl &mmc, int steps)
{
      if (!mmc_control) {
            return;
      }

      struct timeval now;
      struct timeval diff = { 0, 0 };

      gettimeofday (&now, 0);
      
      timersub (&now, &last_mmc_step, &diff);

      gettimeofday (&now, 0);
      timersub (&now, &last_mmc_step, &diff);

      if (last_mmc_step.tv_sec != 0 && (diff.tv_usec + (diff.tv_sec * 1000000)) < _engine.usecs_per_cycle()) {
            return;
      }
      
      double diff_secs = diff.tv_sec + (diff.tv_usec / 1000000.0);
      double cur_speed = (((steps * 0.5) * smpte_frames_per_second) / diff_secs) / smpte_frames_per_second;
      
      if (_transport_speed == 0 || cur_speed * _transport_speed < 0) {
            /* change direction */
            step_speed = cur_speed;
      } else {
            step_speed = (0.6 * step_speed) + (0.4 * cur_speed);
      }

      step_speed *= 0.25;

#if 0
      cerr << "delta = " << diff_secs 
           << " ct = " << _transport_speed
           << " steps = " << steps
           << " new speed = " << cur_speed 
           << " speed = " << step_speed
           << endl;
#endif      

      request_transport_speed (step_speed);
      last_mmc_step = now;

      if (!step_queued) {
            midi_timeouts.push_back (slot (*this, &Session::mmc_step_timeout));
            step_queued = true;
      }
}

void
Session::mmc_rewind (MIDI::MachineControl &mmc)
{
      if (mmc_control) {
            request_transport_speed(-8.0f);
      }
}

void
Session::mmc_fast_forward (MIDI::MachineControl &mmc)
{
      if (mmc_control) {
            request_transport_speed(8.0f);
      }
}

void
Session::mmc_locate (MIDI::MachineControl &mmc, const MIDI::byte* mmc_tc)
{
      if (!mmc_control) {
            return;
      }

      jack_nframes_t target_frame;
      SMPTE_Time smpte;

      smpte.hours = mmc_tc[0] & 0xf;
      smpte.minutes = mmc_tc[1];
      smpte.seconds = mmc_tc[2];
      smpte.frames = mmc_tc[3];
  
      // Also takes smpte offset into account:
      smpte_to_sample( smpte, target_frame, true /* use_offset */, false /* use_subframes */ );
      
      if (target_frame > max_frames) {
            target_frame = max_frames;
      }

      /* Some (all?) MTC/MMC devices do not send a full MTC frame
         at the end of a locate, instead sending only an MMC
         locate command. This causes the current position
         of an MTC slave to become out of date. Catch this.
      */

      MTC_Slave* mtcs = dynamic_cast<MTC_Slave*> (_slave);

      if (mtcs != 0) {
            // cerr << "Locate *with* MTC slave\n";
            mtcs->handle_locate (mmc_tc);
      } else {
            // cerr << "Locate without MTC slave\n";
            request_locate (target_frame, false);
      }
}

void
Session::mmc_shuttle (MIDI::MachineControl &mmc, float speed, bool forw)
{
      cerr << "MMC shuttle, speed = " << speed << endl;

      if (!mmc_control) {
            return;
      }

      if (shuttle_speed_threshold >= 0 && speed > shuttle_speed_threshold) {
            speed *= shuttle_speed_factor;
      }

      cerr << "requested MMC control speed = " << speed << endl;
      
      if (forw) {
            request_transport_speed (speed);
      } else {
            request_transport_speed (-speed);
      }
}

void
Session::mmc_record_enable (MIDI::MachineControl &mmc, size_t trk, bool enabled)
{
      if (mmc_control) {

            /* don't take route or diskstream lock: if using dynamic punch,
               this could cause a dropout. XXX is that really OK?
               or should we queue a rec-enable request?
            */

            size_t n;
            RouteList::iterator i;

            for (n = 0, i = routes.begin(); i != routes.end(); ++i) {
                  AudioTrack *at;

                  if ((at = dynamic_cast<AudioTrack*>(*i)) != 0) {
                        if (n++ == trk) {
                              at->set_record_enable (enabled, &mmc);
                              break;
                        }
                  }
            }
      }
}

void
Session::send_full_time_code_in_another_thread ()
{
      send_time_code_in_another_thread (true);
}

void
Session::send_midi_time_code_in_another_thread ()
{
      send_time_code_in_another_thread (false);
}

void
Session::send_time_code_in_another_thread (bool full)
{
      jack_nframes_t two_smpte_frames_duration;
      jack_nframes_t quarter_frame_duration;

      /* Duration of two smpte frames */
      two_smpte_frames_duration = ((long) _frames_per_smpte_frame) << 1;

      /* Duration of one quarter frame */
      quarter_frame_duration = ((long) _frames_per_smpte_frame) >> 2;

      if (_transport_frame < (outbound_mtc_smpte_frame + (next_quarter_frame_to_send * quarter_frame_duration)))
      {
            /* There is no work to do.
               We throttle this here so that we don't overload
               the transport thread with requests.
            */
            return;
      }

      MIDIRequest* request = new MIDIRequest;

      if (full) {
            request->type = MIDIRequest::SendFullMTC;
      } else {
            request->type = MIDIRequest::SendMTC;
      }
      
      midi_requests.write (&request, 1);
      poke_midi_thread ();
}

void
Session::change_midi_ports ()
{
      MIDIRequest* request = new MIDIRequest;

      request->type = MIDIRequest::PortChange;
      midi_requests.write (&request, 1);
      poke_midi_thread ();
}

int
Session::send_full_time_code ()

{
      MIDI::byte msg[10];
      SMPTE_Time smpte;

      if (_mtc_port == 0 || !send_mtc) {
            return 0;
      }

      // Get smpte time for this transport frame
      sample_to_smpte(_transport_frame, smpte, true /* use_offset */, false /* no subframes */);

      // Check for negative smpte time and prepare for quarter frame transmission
      if (smpte.negative) {
            // Negative mtc is not defined, so sync slave to smpte zero.
            // When _transport_frame gets there we will start transmitting quarter frames
            smpte.hours = 0;
            smpte.minutes = 0;
            smpte.seconds = 0;
            smpte.frames = 0;
            smpte.subframes = 0;
            smpte.negative = false;
            smpte_to_sample( smpte, outbound_mtc_smpte_frame, true, false );
            transmitting_smpte_time = smpte;
      } else {
            transmitting_smpte_time = smpte;
            outbound_mtc_smpte_frame = _transport_frame;
            if (((mtc_smpte_bits >> 5) != MIDI::MTC_25_FPS) && (transmitting_smpte_time.frames % 2)) {
                  // start MTC quarter frame transmission on an even frame
                  smpte_increment( transmitting_smpte_time );
                  outbound_mtc_smpte_frame += (jack_nframes_t) _frames_per_smpte_frame;
            }
      }

      // Compensate for audio latency
      outbound_mtc_smpte_frame += _worst_output_latency;

      next_quarter_frame_to_send = 0;

      // Sync slave to the same smpte time as we are on (except if negative, see above)
      msg[0] = 0xf0;
      msg[1] = 0x7f;
      msg[2] = 0x7f;
      msg[3] = 0x1;
      msg[4] = 0x1;
      msg[9] = 0xf7;

      msg[5] = mtc_smpte_bits | smpte.hours;
      msg[6] = smpte.minutes;
      msg[7] = smpte.seconds;
      msg[8] = smpte.frames;

      {
            LockMonitor lm (midi_lock, __LINE__, __FILE__);
    
            if (_mtc_port->midimsg (msg, sizeof (msg))) {
                  error << _("Session: could not send full MIDI time code") << endmsg;
                  
                  return -1;
            }
      }

      return 0;
}

int
Session::send_midi_time_code ()
{
      if (_mtc_port == 0 || !send_mtc || transmitting_smpte_time.negative || (next_quarter_frame_to_send < 0) )  {
            return 0;
      }

      jack_nframes_t two_smpte_frames_duration;
      jack_nframes_t quarter_frame_duration;

      /* Duration of two smpte frames */
      two_smpte_frames_duration = ((long) _frames_per_smpte_frame) << 1;

      /* Duration of one quarter frame */
      quarter_frame_duration = ((long) _frames_per_smpte_frame) >> 2;

      while (_transport_frame >= (outbound_mtc_smpte_frame + (next_quarter_frame_to_send * quarter_frame_duration))) {

            // Send quarter frames up to current time
            {
                  LockMonitor lm (midi_lock, __LINE__, __FILE__);

                  switch(next_quarter_frame_to_send) {
                  case 0:
                        mtc_msg[1] =  0x00 | (transmitting_smpte_time.frames & 0xf);
                        break;
                  case 1:
                        mtc_msg[1] =  0x10 | ((transmitting_smpte_time.frames & 0xf0) >> 4);
                        break;
                  case 2:
                        mtc_msg[1] =  0x20 | (transmitting_smpte_time.seconds & 0xf);
                        break;
                  case 3:
                        mtc_msg[1] =  0x30 | ((transmitting_smpte_time.seconds & 0xf0) >> 4);
                        break;
                  case 4:
                        mtc_msg[1] =  0x40 | (transmitting_smpte_time.minutes & 0xf);
                        break;
                  case 5:
                        mtc_msg[1] = 0x50 | ((transmitting_smpte_time.minutes & 0xf0) >> 4);
                        break;
                  case 6:
                        mtc_msg[1] = 0x60 | ((mtc_smpte_bits|transmitting_smpte_time.hours) & 0xf);
                        break;
                  case 7:
                        mtc_msg[1] = 0x70 | (((mtc_smpte_bits|transmitting_smpte_time.hours) & 0xf0) >> 4);
                        break;
                  }                 
                  
                  if (_mtc_port->midimsg (mtc_msg, 2)) {
                        error << compose(_("Session: cannot send quarter-frame MTC message (%1)"), strerror (errno)) 
                              << endmsg;
                        
                        return -1;
                  }

                  //       cout << "smpte = " << transmitting_smpte_time.hours << ":" << transmitting_smpte_time.minutes << ":" << transmitting_smpte_time.seconds << ":" << transmitting_smpte_time.frames << ", qfm = " << next_quarter_frame_to_send << endl;

                  // Increment quarter frame counter
                  next_quarter_frame_to_send++;
      
                  if (next_quarter_frame_to_send >= 8) {
                        // Wrap quarter frame counter
                        next_quarter_frame_to_send = 0;
                        // Increment smpte time twice
                        smpte_increment( transmitting_smpte_time );
                        smpte_increment( transmitting_smpte_time );        
                        // Re-calculate timing of first quarter frame
                        smpte_to_sample( transmitting_smpte_time, outbound_mtc_smpte_frame, true /* use_offset */, false );
                        // Compensate for audio latency
                        outbound_mtc_smpte_frame += _worst_output_latency;
                  }
            }
      }
      return 0;
}

/***********************************************************************
 OUTBOUND MMC STUFF
**********************************************************************/

void
Session::send_mmc_in_another_thread (MIDI::MachineControl::Command cmd, jack_nframes_t target_frame)
{
      MIDIRequest* request;

      if (_mtc_port == 0 || !send_mmc) {
            return;
      }

      request = new MIDIRequest;
      request->type = MIDIRequest::SendMMC;
      request->mmc_cmd = cmd;
      request->locate_frame = target_frame;

      midi_requests.write (&request, 1);
      poke_midi_thread ();
}

void
Session::deliver_mmc (MIDI::MachineControl::Command cmd, jack_nframes_t where)
{
      using namespace MIDI;
      int nbytes = 4;
      SMPTE_Time smpte;

      if (_mmc_port == 0 || !send_mmc) {
            return;
      }

      mmc_buffer[nbytes++] = cmd;

      // cerr << "delivering MMC, cmd = " << hex << (int) cmd << dec << endl;
      
      switch (cmd) {
      case MachineControl::cmdLocate:
            smpte_time_subframes (where, smpte);

            mmc_buffer[nbytes++] = 0x6; // byte count
            mmc_buffer[nbytes++] = 0x1; // "TARGET" subcommand
            mmc_buffer[nbytes++] = smpte.hours;
            mmc_buffer[nbytes++] = smpte.minutes;
            mmc_buffer[nbytes++] = smpte.seconds;
            mmc_buffer[nbytes++] = smpte.frames;
            mmc_buffer[nbytes++] = smpte.subframes;
            break;

      case MachineControl::cmdStop:
            break;

      case MachineControl::cmdPlay:
            /* always convert Play into Deferred Play */
            mmc_buffer[4] = MachineControl::cmdDeferredPlay;
            break;

      case MachineControl::cmdDeferredPlay:
            break;

      case MachineControl::cmdRecordStrobe:
            break;

      case MachineControl::cmdRecordExit:
            break;

      case MachineControl::cmdRecordPause:
            break;

      default:
            nbytes = 0;
      };

      if (nbytes) {

            mmc_buffer[nbytes++] = 0xf7; // terminate SysEx/MMC message

            LockMonitor lm (midi_lock, __LINE__, __FILE__);

            if (_mmc_port->write (mmc_buffer, nbytes) != nbytes) {
                  error << compose(_("MMC: cannot send command %1%2%3"), &hex, cmd, &dec) << endmsg;
            }
      }
}

bool
Session::mmc_step_timeout ()
{
      struct timeval now;
      struct timeval diff;
      double diff_usecs;
      gettimeofday (&now, 0);

      timersub (&now, &last_mmc_step, &diff);
      diff_usecs = diff.tv_sec * 1000000 + diff.tv_usec;

      if (diff_usecs > 1000000.0 || fabs (_transport_speed) < 0.0000001) {
            /* too long or too slow, stop transport */
            request_transport_speed (0.0);
            step_queued = false;
            return false;
      }

      if (diff_usecs < 250000.0) {
            /* too short, just keep going */
            return true;
      }

      /* slow it down */

      request_transport_speed (_transport_speed * 0.75);
      return true;
}


void
Session::send_midi_message (MIDI::Port * port, MIDI::eventType ev, MIDI::channel_t ch, MIDI::EventTwoBytes data)
{
      // in another thread, really
      
      MIDIRequest* request = new MIDIRequest;

      request->type = MIDIRequest::SendMessage;
      request->port = port;
      request->ev = ev;
      request->chan = ch;
      request->data = data;
      
      midi_requests.write (&request, 1);
      poke_midi_thread ();
}

void
Session::deliver_midi (MIDI::Port * port, MIDI::byte* buf, int32_t bufsize)
{
      // in another thread, really
      
      MIDIRequest* request = new MIDIRequest;

      request->type = MIDIRequest::Deliver;
      request->port = port;
      request->buf = buf;
      request->size = bufsize;
      
      midi_requests.write (&request, 1);
      poke_midi_thread ();
}

void
Session::deliver_midi_message (MIDI::Port * port, MIDI::eventType ev, MIDI::channel_t ch, MIDI::EventTwoBytes data)
{
      if (port == 0 || ev == MIDI::none) {
            return;
      }

      midi_msg[0] = (ev & 0xF0) | (ch & 0xF); 
      midi_msg[1] = data.controller_number;
      midi_msg[2] = data.value;

      port->write (midi_msg, 3);
}

void
Session::deliver_data (MIDI::Port * port, MIDI::byte* buf, int32_t size)
{
      if (port) {
            port->write (buf, size);
      }

      /* this is part of the semantics of the Deliver request */

      delete [] buf;
}

/*---------------------------------------------------------------------------
  MIDI THREAD 
  ---------------------------------------------------------------------------*/

int
Session::start_midi_thread ()
{
      if (pipe (midi_request_pipe)) {
            error << compose(_("Cannot create transport request signal pipe (%1)"), strerror (errno)) << endmsg;
            return -1;
      }

      if (fcntl (midi_request_pipe[0], F_SETFL, O_NONBLOCK)) {
            error << compose(_("UI: cannot set O_NONBLOCK on "    "signal read pipe (%1)"), strerror (errno)) << endmsg;
            return -1;
      }

      if (fcntl (midi_request_pipe[1], F_SETFL, O_NONBLOCK)) {
            error << compose(_("UI: cannot set O_NONBLOCK on "    "signal write pipe (%1)"), strerror (errno)) << endmsg;
            return -1;
      }

      if (pthread_create_and_store ("transport", &midi_thread, 0, _midi_thread_work, this)) {
            error << _("Session: could not create transport thread") << endmsg;
            return -1;
      }

      // pthread_detach (midi_thread);

      return 0;
}

void
Session::terminate_midi_thread ()
{
      MIDIRequest* request = new MIDIRequest;
      void* status;

      request->type = MIDIRequest::Quit;

      midi_requests.write (&request, 1);
      poke_midi_thread ();

      pthread_join (midi_thread, &status);
}

void
Session::poke_midi_thread ()
{
      char c;

      if (write (midi_request_pipe[1], &c, 1) != 1) {
            error << compose(_("cannot send signal to midi thread! (%1)"), strerror (errno)) << endmsg;
      }
}

void *
Session::_midi_thread_work (void* arg)
{
      pthread_setcancelstate (PTHREAD_CANCEL_ENABLE, 0);
      pthread_setcanceltype (PTHREAD_CANCEL_ASYNCHRONOUS, 0);

      ((Session *) arg)->midi_thread_work ();
      return 0;
}

void
Session::midi_thread_work ()
{
      MIDIRequest* request;
      struct pollfd pfd[4];
      int nfds = 0;
      int timeout;
      int fds_ready;
      struct sched_param rtparam;
      int x;
      bool restart;
      vector<MIDI::Port*> ports;

      PBD::ThreadCreated (pthread_self(), X_("MIDI"));

      memset (&rtparam, 0, sizeof (rtparam));
      rtparam.sched_priority = 9; /* XXX should be relative to audio (JACK) thread */
      
      if ((x = pthread_setschedparam (pthread_self(), SCHED_FIFO, &rtparam)) != 0) {
            // do we care? not particularly.
      } 

      /* set up the port vector; 4 is the largest possible size for now */

      ports.push_back (0);
      ports.push_back (0);
      ports.push_back (0);
      ports.push_back (0);

      while (1) {

            nfds = 0;

            pfd[nfds].fd = midi_request_pipe[0];
            pfd[nfds].events = POLLIN|POLLHUP|POLLERR;
            nfds++;

            /* if we are using MMC control, we obviously have to listen
               on the appropriate port.
            */

            if (mmc_control && _mmc_port && _mmc_port->selectable() >= 0) {
                  pfd[nfds].fd = _mmc_port->selectable();
                  pfd[nfds].events = POLLIN|POLLHUP|POLLERR;
                  ports[nfds] = _mmc_port;
                  nfds++;
            }

            /* if MTC is being handled on a different port from MMC
               or we are not handling MMC at all, poll
               the relevant port.
            */

            if (_mtc_port && (_mtc_port != _mmc_port || !mmc_control) && _mtc_port->selectable() >= 0) {
                  pfd[nfds].fd = _mtc_port->selectable();
                  pfd[nfds].events = POLLIN|POLLHUP|POLLERR;
                  ports[nfds] = _mtc_port;
                  nfds++;
            }

            if (_midi_port && (_midi_port != _mmc_port || !mmc_control) && (_midi_port != _mtc_port) && _midi_port->selectable() >= 0) {
                  pfd[nfds].fd = _midi_port->selectable();
                  pfd[nfds].events = POLLIN|POLLHUP|POLLERR;
                  ports[nfds] = _midi_port;
                  nfds++;
            }
            
            if (!midi_timeouts.empty()) {
                  timeout = 100; /* 10msecs */
            } else {
                  timeout = -1; /* if there is no data, we don't care */
            }

        again:
            // cerr << "MIDI poll on " << nfds << " for " << timeout << endl;
            if (poll (pfd, nfds, timeout) < 0) {
                  if (errno == EINTR) {
                        /* gdb at work, perhaps */
                        goto again;
                  }

                  error << compose(_("MIDI thread poll failed (%1)"), strerror (errno)) << endmsg;

                  break;
            }
            // cerr << "MIDI thread wakes at " << get_cycles () << endl;

            fds_ready = 0;
            restart = false;

            /* check the transport request pipe */

            if (pfd[0].revents & ~POLLIN) {
                  error << _("Error on transport thread request pipe") << endmsg;
                  break;
            }

            if (pfd[0].revents & POLLIN) {

                  char foo[16];
                  
                  // cerr << "MIDI request FIFO ready\n";
                  fds_ready++;

                  /* empty the pipe of all current requests */

                  while (1) {
                        size_t nread = read (midi_request_pipe[0], &foo, sizeof (foo));

                        if (nread > 0) {
                              if ((size_t) nread < sizeof (foo)) {
                                    break;
                              } else {
                                    continue;
                              }
                        } else if (nread == 0) {
                              break;
                        } else if (errno == EAGAIN) {
                              break;
                        } else {
                              fatal << _("Error reading from transport request pipe") << endmsg;
                              /*NOTREACHED*/
                        }
                  }

                  while (midi_requests.read (&request, 1) == 1) {

                        switch (request->type) {
                              
                        case MIDIRequest::SendFullMTC:
                              // cerr << "send full MTC\n";
                              send_full_time_code ();
                              // cerr << "... done\n";
                              break;
                              
                        case MIDIRequest::SendMTC:
                              // cerr << "send qtr MTC\n";
                              send_midi_time_code ();
                              // cerr << "... done\n";
                              break;
                              
                        case MIDIRequest::SendMMC:
                              // cerr << "send MMC\n";
                              deliver_mmc (request->mmc_cmd, request->locate_frame);
                              // cerr << "... done\n";
                              break;

                        case MIDIRequest::SendMessage:
                              // cerr << "send Message\n";
                              deliver_midi_message (request->port, request->ev, request->chan, request->data);
                              // cerr << "... done\n";
                              break;
                              
                        case MIDIRequest::Deliver:
                              // cerr << "deliver\n";
                              deliver_data (_midi_port, request->buf, request->size);
                              // cerr << "... done\n";
                              break;
                                    
                        case MIDIRequest::PortChange:
                              /* restart poll with new ports */
                              // cerr << "rebind\n";
                              restart = true;
                              break;
                                    
                        case MIDIRequest::Quit:
                              delete request;
                              pthread_exit_pbd (0);
                              /*NOTREACHED*/
                              break;
                              
                        default:
                              break;
                        }


                        delete request;
                  }

            } 

            if (restart) {
                  continue;
            }

            /* now read the rest of the ports */

            for (int p = 1; p < nfds; ++p) {
                  if ((pfd[p].revents & ~POLLIN)) {
                        // error << compose(_("Transport: error polling MIDI port %1 (revents =%2%3%4"), p, &hex, pfd[p].revents, &dec) << endmsg;
                        break;
                  }
                  
                  if (pfd[p].revents & POLLIN) {
                        fds_ready++;
                        midi_read (ports[p]);
                  }
            }

            /* timeout driven */
            
            if (fds_ready < 2 && timeout != -1) {

                  for (MidiTimeoutList::iterator i = midi_timeouts.begin(); i != midi_timeouts.end(); ) {
                        
                        MidiTimeoutList::iterator tmp;
                        tmp = i;
                        ++tmp;
                        
                        if (!(*i).call ()) {
                              midi_timeouts.erase (i);
                        }
                        
                        i = tmp;
                  }
            }
      }
}

bool
Session::get_mmc_control () const
{
      return mmc_control;
}
bool
Session::get_midi_feedback () const
{
      /* since this a "write" function we have to check the port as well 
         as the control toggle.
      */
      return _midi_port && midi_feedback;
}
bool
Session::get_midi_control () const
{
      return midi_control;
}

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