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Diffstat (limited to 'libs/ardour/session_midi.cc')
| -rw-r--r-- | libs/ardour/session_midi.cc | 1211 |
1 files changed, 1211 insertions, 0 deletions
diff --git a/libs/ardour/session_midi.cc b/libs/ardour/session_midi.cc new file mode 100644 index 0000000000..b4938636a2 --- /dev/null +++ b/libs/ardour/session_midi.cc @@ -0,0 +1,1211 @@ + +/* + 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. + +*/ + +#include <string> +#include <cmath> +#include <cerrno> +#include <cassert> +#include <unistd.h> +#include <fcntl.h> +#include <poll.h> + +#include <boost/shared_ptr.hpp> + +#include <midi++/mmc.h> +#include <midi++/port.h> +#include <midi++/manager.h> +#include <pbd/error.h> +#include <glibmm/thread.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/midi_track.h> +#include <ardour/audio_diskstream.h> +#include <ardour/slave.h> +#include <ardour/cycles.h> +#include <ardour/smpte.h> + +#include "i18n.h" + +using namespace std; +using namespace ARDOUR; +using namespace PBD; +using namespace MIDI; + +MachineControl::CommandSignature MMC_CommandSignature; +MachineControl::ResponseSignature MMC_ResponseSignature; + + +void +Session::midi_panic() +{ + { + boost::shared_ptr<RouteList> r = routes.reader (); + + for (RouteList::iterator i = r->begin(); i != r->end(); ++i) { + MidiTrack *track = dynamic_cast<MidiTrack*>((*i).get()); + if (track != 0) { + track->midi_panic(); + } + } + } +} + +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. +**********************************************************************/ + +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 << string_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; +} + +void +Session::set_mmc_receive_device_id (uint32_t device_id) +{ + if (mmc) { + mmc->set_receive_device_id (device_id); + } +} + +void +Session::set_mmc_send_device_id (uint32_t device_id) +{ + if (mmc) { + mmc->set_send_device_id (device_id); + } +} + +int +Session::set_mmc_port (string port_tag) +{ + MIDI::byte old_recv_device_id = 0; + MIDI::byte old_send_device_id = 0; + bool reset_id = false; + + 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) { + old_recv_device_id = mmc->receive_device_id(); + old_recv_device_id = mmc->send_device_id(); + reset_id = true; + delete mmc; + } + + mmc = new MIDI::MachineControl (*_mmc_port, 1.0, + MMC_CommandSignature, + MMC_ResponseSignature); + + if (reset_id) { + mmc->set_receive_device_id (old_recv_device_id); + mmc->set_send_device_id (old_send_device_id); + } + + mmc->Play.connect + (mem_fun (*this, &Session::mmc_deferred_play)); + mmc->DeferredPlay.connect + (mem_fun (*this, &Session::mmc_deferred_play)); + mmc->Stop.connect + (mem_fun (*this, &Session::mmc_stop)); + mmc->FastForward.connect + (mem_fun (*this, &Session::mmc_fast_forward)); + mmc->Rewind.connect + (mem_fun (*this, &Session::mmc_rewind)); + mmc->Pause.connect + (mem_fun (*this, &Session::mmc_pause)); + mmc->RecordPause.connect + (mem_fun (*this, &Session::mmc_record_pause)); + mmc->RecordStrobe.connect + (mem_fun (*this, &Session::mmc_record_strobe)); + mmc->RecordExit.connect + (mem_fun (*this, &Session::mmc_record_exit)); + mmc->Locate.connect + (mem_fun (*this, &Session::mmc_locate)); + mmc->Step.connect + (mem_fun (*this, &Session::mmc_step)); + mmc->Shuttle.connect + (mem_fun (*this, &Session::mmc_shuttle)); + mmc->TrackRecordStatusChange.connect + (mem_fun (*this, &Session::mmc_record_enable)); + + + /* also handle MIDI SPP because its so common */ + + _mmc_port->input()->start.connect (mem_fun (*this, &Session::spp_start)); + _mmc_port->input()->contineu.connect (mem_fun (*this, &Session::spp_continue)); + _mmc_port->input()->stop.connect (mem_fun (*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 0 + 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; + + /* XXX need something to forward this to control protocols ? or just + use the signal below + */ + + Config->set_midi_port_name (port_tag); + + out: +#endif + 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::setup_midi_control () +{ + outbound_mtc_smpte_frame = 0; + next_quarter_frame_to_send = 0; + + /* setup the MMC buffer */ + + mmc_buffer[0] = 0xf0; // SysEx + mmc_buffer[1] = 0x7f; // Real Time SysEx ID for MMC + mmc_buffer[2] = (mmc ? mmc->send_device_id() : 0x7f); + 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; +} + +void +Session::spp_start (Parser& ignored) +{ + if (Config->get_mmc_control() && (Config->get_slave_source() != MTC)) { + request_transport_speed (1.0); + } +} + +void +Session::spp_continue (Parser& ignored) +{ + spp_start (ignored); +} + +void +Session::spp_stop (Parser& ignored) +{ + if (Config->get_mmc_control()) { + request_stop (); + } +} + +void +Session::mmc_deferred_play (MIDI::MachineControl &mmc) +{ + if (Config->get_mmc_control() && (Config->get_slave_source() != MTC)) { + request_transport_speed (1.0); + } +} + +void +Session::mmc_record_pause (MIDI::MachineControl &mmc) +{ + if (Config->get_mmc_control()) { + maybe_enable_record(); + } +} + +void +Session::mmc_record_strobe (MIDI::MachineControl &mmc) +{ + if (!Config->get_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); + g_atomic_int_set (&_record_status, Enabled); + RecordStateChanged (); /* EMIT SIGNAL */ + + request_transport_speed (1.0); + + } else { + + enable_record (); + } +} + +void +Session::mmc_record_exit (MIDI::MachineControl &mmc) +{ + if (Config->get_mmc_control()) { + disable_record (false); + } +} + +void +Session::mmc_stop (MIDI::MachineControl &mmc) +{ + if (Config->get_mmc_control()) { + request_stop (); + } +} + +void +Session::mmc_pause (MIDI::MachineControl &mmc) +{ + if (Config->get_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 (!Config->get_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 (mem_fun (*this, &Session::mmc_step_timeout)); + step_queued = true; + } +} + +void +Session::mmc_rewind (MIDI::MachineControl &mmc) +{ + if (Config->get_mmc_control()) { + request_transport_speed(-8.0f); + } +} + +void +Session::mmc_fast_forward (MIDI::MachineControl &mmc) +{ + if (Config->get_mmc_control()) { + request_transport_speed(8.0f); + } +} + +void +Session::mmc_locate (MIDI::MachineControl &mmc, const MIDI::byte* mmc_tc) +{ + if (!Config->get_mmc_control()) { + return; + } + + 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]; + smpte.rate = smpte_frames_per_second(); + smpte.drop = smpte_drop_frames(); + + // 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) +{ + if (!Config->get_mmc_control()) { + return; + } + + if (Config->get_shuttle_speed_threshold() >= 0 && speed > Config->get_shuttle_speed_threshold()) { + speed *= Config->get_shuttle_speed_factor(); + } + + 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 (Config->get_mmc_control()) { + + RouteList::iterator i; + boost::shared_ptr<RouteList> r = routes.reader(); + + for (i = r->begin(); i != r->end(); ++i) { + AudioTrack *at; + + if ((at = dynamic_cast<AudioTrack*>((*i).get())) != 0) { + if (trk == at->remote_control_id()) { + at->set_record_enable (enabled, &mmc); + break; + } + } + } + } +} + +void +Session::change_midi_ports () +{ + MIDIRequest* request = new MIDIRequest; + + request->type = MIDIRequest::PortChange; + midi_requests.write (&request, 1); + poke_midi_thread (); +} + +/** Send MTC Full Frame message (complete SMPTE time) for the start of this cycle. + * This resets the MTC code, the next quarter frame message that is sent will be + * the first one with the beginning of this cycle as the new start point. + */ + +int +Session::send_full_time_code(nframes_t nframes) +{ + /* This function could easily send at a given frame offset, but would + * that be useful? Does ardour do sub-block accurate locating? [DR] */ + + MIDI::byte msg[10]; + SMPTE::Time smpte; + + _send_smpte_update = false; + + if (_mtc_port == 0 || !session_send_mtc) { + return 0; + } + + // Get smpte time for this transport frame + sample_to_smpte(_transport_frame, smpte, true /* use_offset */, false /* no subframes */); + + transmitting_smpte_time = smpte; + outbound_mtc_smpte_frame = _transport_frame; + + // I don't understand this bit yet.. [DR] + 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 += (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 + 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; + + cerr << "MTC: Sending full time code at " << outbound_mtc_smpte_frame << endl; + + // Send message at offset 0, sent time is for the start of this cycle + if (_mtc_port->midimsg (msg, sizeof (msg), 0)) { + error << _("Session: could not send full MIDI time code") << endmsg; + return -1; + } + + return 0; +} + + +/** Sends MTC (quarter-frame) messages for this cycle. + * Must be called exactly once per cycle from the audio thread. Realtime safe. + * This function assumes the state of full SMPTE is sane, eg. the slave is + * expecting quarter frame messages and has the right frame of reference (any + * full MTC SMPTE time messages that needed to be sent should have been sent + * earlier already this cycle by send_full_time_code) + */ +int +Session::send_midi_time_code_for_cycle(nframes_t nframes) +{ + assert (next_quarter_frame_to_send >= 0); + assert (next_quarter_frame_to_send <= 7); + + if (_mtc_port == 0 || !session_send_mtc || transmitting_smpte_time.negative + /*|| (next_quarter_frame_to_send < 0)*/ ) { + // cerr << "(MTC) Not sending MTC\n"; + return 0; + } + + /* Duration of one quarter frame */ + nframes_t quarter_frame_duration = ((long) _frames_per_smpte_frame) >> 2; + + // cerr << "(MTC) TR: " << _transport_frame << " - SF: " << outbound_mtc_smpte_frame + // << " - NQ: " << next_quarter_frame_to_send << " - FD" << quarter_frame_duration << endl; + + // FIXME: this should always be true + //assert((outbound_mtc_smpte_frame + (next_quarter_frame_to_send * quarter_frame_duration)) + // > _transport_frame); + + + // Send quarter frames for this cycle + while (_transport_frame + nframes > (outbound_mtc_smpte_frame + + (next_quarter_frame_to_send * quarter_frame_duration))) { + + // cerr << "(MTC) Next frame to send: " << next_quarter_frame_to_send << endl; + + 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; + } + + const nframes_t msg_time = (outbound_mtc_smpte_frame + + (quarter_frame_duration * next_quarter_frame_to_send)); + + // This message must fall within this block or something is broken + assert(msg_time >= _transport_frame); + assert(msg_time < _transport_frame + nframes); + + nframes_t out_stamp = msg_time - _transport_frame; + assert(out_stamp < nframes); + + if (_mtc_port->midimsg (mtc_msg, 2, out_stamp)) { + error << string_compose(_("Session: cannot send quarter-frame MTC message (%1)"), strerror (errno)) + << endmsg; + return -1; + } + + /*cerr << "(MTC) SMPTE: " << transmitting_smpte_time.hours + << ":" << transmitting_smpte_time.minutes + << ":" << transmitting_smpte_time.seconds + << ":" << transmitting_smpte_time.frames + << ", qfm = " << next_quarter_frame_to_send + << ", stamp = " << out_stamp + << ", delta = " << _transport_frame + out_stamp - last_time << 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 ); + outbound_mtc_smpte_frame += 8 * quarter_frame_duration; + // Compensate for audio latency + outbound_mtc_smpte_frame += _worst_output_latency; + } + } + + return 0; +} + +/*********************************************************************** + OUTBOUND MMC STUFF +**********************************************************************/ + +void +Session::deliver_mmc (MIDI::MachineControl::Command cmd, nframes_t where) +{ + using namespace MIDI; + int nbytes = 4; + SMPTE::Time smpte; + + if (_mmc_port == 0 || !session_send_mmc) { + // cerr << "Not delivering MMC " << _mmc_port << " - " << session_send_mmc << endl; + 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 */ + /* Why? [DR] */ + 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 + + if (_mmc_port->midimsg (mmc_buffer, nbytes, 0)) { + error << string_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; +} + +/*--------------------------------------------------------------------------- + MIDI THREAD + ---------------------------------------------------------------------------*/ + +int +Session::start_midi_thread () +{ + if (pipe (midi_request_pipe)) { + error << string_compose(_("Cannot create transport request signal pipe (%1)"), strerror (errno)) << endmsg; + return -1; + } + + if (fcntl (midi_request_pipe[0], F_SETFL, O_NONBLOCK)) { + error << string_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 << string_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; + } + + return 0; +} + +void +Session::terminate_midi_thread () +{ + if (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 () +{ + static char c = 0; + + if (write (midi_request_pipe[1], &c, 1) != 1) { + error << string_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::ThreadCreatedWithRequestSize (pthread_self(), X_("MIDI"), 2048); + + 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.assign (4, (MIDI::Port*) 0); + + while (1) { + + nfds = 0; + + pfd[nfds].fd = midi_request_pipe[0]; + pfd[nfds].events = POLLIN|POLLHUP|POLLERR; + nfds++; + + if (Config->get_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 || !Config->get_mmc_control()) && _mtc_port->selectable() >= 0) { + pfd[nfds].fd = _mtc_port->selectable(); + pfd[nfds].events = POLLIN|POLLHUP|POLLERR; + ports[nfds] = _mtc_port; + nfds++; + } + + /* if we are using MMC control, we obviously have to listen + the relevant port. + */ + + if (_midi_port && (_midi_port != _mmc_port || !Config->get_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 << string_compose(_("MIDI thread poll failed (%1)"), strerror (errno)) << endmsg; + + break; + } + // cerr << "MIDI thread wakes at " << get_cycles () << endl; + + fds_ready = 0; + + /* 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::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 << string_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++; + ports[p]->parse (); + } + } + + /* 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)()) { + midi_timeouts.erase (i); + } + + i = tmp; + } + } + } +} + |