libs/ardour/midi_diskstream.cc

   1 /*
   2     Copyright (C) 2000-2003 Paul Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17 */
  18
  19 #include <fstream>
  20 #include <cstdio>
  21 #include <unistd.h>
  22 #include <cmath>
  23 #include <cerrno>
  24 #include <string>
  25 #include <climits>
  26 #include <fcntl.h>
  27 #include <cstdlib>
  28 #include <ctime>
  29 #include <sys/stat.h>
  30 #include <sys/mman.h>
  31
  32 #include "pbd/error.h"
  33 #include "pbd/basename.h"
  34 #include <glibmm/thread.h>
  35 #include "pbd/xml++.h"
  36 #include "pbd/memento_command.h"
  37 #include "pbd/enumwriter.h"
  38
  39 #include "ardour/ardour.h"
  40 #include "ardour/audioengine.h"
  41 #include "ardour/configuration.h"
  42 #include "ardour/cycle_timer.h"
  43 #include "ardour/io.h"
  44 #include "ardour/midi_diskstream.h"
  45 #include "ardour/midi_playlist.h"
  46 #include "ardour/midi_port.h"
  47 #include "ardour/midi_region.h"
  48 #include "ardour/playlist_factory.h"
  49 #include "ardour/region_factory.h"
  50 #include "ardour/send.h"
  51 #include "ardour/session.h"
  52 #include "ardour/smf_source.h"
  53 #include "ardour/utils.h"
  54
  55 #include "midi++/types.h"
  56
  57 #include "i18n.h"
  58 #include <locale.h>
  59
  60 using namespace std;
  61 using namespace ARDOUR;
  62 using namespace PBD;
  63
  64 nframes_t MidiDiskstream::midi_readahead = 4096;
  65
  66 MidiDiskstream::MidiDiskstream (Session &sess, const string &name, Diskstream::Flag flag)
  67         : Diskstream(sess, name, flag)
  68         , _playback_buf(0)
  69         , _capture_buf(0)
  70         , _source_port(0)
  71         , _last_flush_frame(0)
  72         , _note_mode(Sustained)
  73         , _frames_written_to_ringbuffer(0)
  74         , _frames_read_from_ringbuffer(0)
  75 {
  76         /* prevent any write sources from being created */
  77
  78         in_set_state = true;
  79
  80         init(flag);
  81         use_new_playlist ();
  82
  83         in_set_state = false;
  84
  85         assert(!destructive());
  86 }
  87
  88 MidiDiskstream::MidiDiskstream (Session& sess, const XMLNode& node)
  89         : Diskstream(sess, node)
  90         , _playback_buf(0)
  91         , _capture_buf(0)
  92         , _source_port(0)
  93         , _last_flush_frame(0)
  94         , _note_mode(Sustained)
  95         , _frames_written_to_ringbuffer(0)
  96         , _frames_read_from_ringbuffer(0)
  97 {
  98         in_set_state = true;
  99         init (Recordable);
 100
 101         if (set_state (node)) {
 102                 in_set_state = false;
 103                 throw failed_constructor();
 104         }
 105
 106         in_set_state = false;
 107
 108         if (destructive()) {
 109                 use_destructive_playlist ();
 110         }
 111 }
 112
 113 void
 114 MidiDiskstream::init (Diskstream::Flag f)
 115 {
 116         Diskstream::init(f);
 117
 118         /* there are no channels at this point, so these
 119            two calls just get speed_buffer_size and wrap_buffer
 120            size setup without duplicating their code.
 121         */
 122
 123         set_block_size (_session.get_block_size());
 124         allocate_temporary_buffers ();
 125
 126         const size_t size = _session.midi_diskstream_buffer_size();
 127         _playback_buf = new MidiRingBuffer<nframes_t>(size);
 128         _capture_buf = new MidiRingBuffer<nframes_t>(size);
 129
 130         _n_channels = ChanCount(DataType::MIDI, 1);
 131
 132         assert(recordable());
 133 }
 134
 135 MidiDiskstream::~MidiDiskstream ()
 136 {
 137         Glib::Mutex::Lock lm (state_lock);
 138 }
 139
 140
 141 void
 142 MidiDiskstream::non_realtime_locate (nframes_t position)
 143 {
 144         if (_write_source) {
 145                 _write_source->set_timeline_position (position);
 146         }
 147         seek(position, false);
 148 }
 149
 150
 151 void
 152 MidiDiskstream::non_realtime_input_change ()
 153 {
 154         {
 155                 Glib::Mutex::Lock lm (state_lock);
 156
 157                 if (input_change_pending == NoChange) {
 158                         return;
 159                 }
 160
 161                 if (input_change_pending & ConfigurationChanged) {
 162                         if (_io->n_ports().n_midi() != _n_channels.n_midi()) {
 163                                 error << "Can not feed IO " << _io->n_ports()
 164                                         << " with diskstream " << _n_channels << endl;
 165                         }
 166                 }
 167
 168                 get_input_sources ();
 169                 set_capture_offset ();
 170
 171                 if (first_input_change) {
 172                         set_align_style (_persistent_alignment_style);
 173                         first_input_change = false;
 174                 } else {
 175                         set_align_style_from_io ();
 176                 }
 177
 178                 input_change_pending = NoChange;
 179
 180                 /* implicit unlock */
 181         }
 182
 183         /* reset capture files */
 184
 185         reset_write_sources (false);
 186
 187         /* now refill channel buffers */
 188
 189         if (speed() != 1.0f || speed() != -1.0f) {
 190                 seek ((nframes_t) (_session.transport_frame() * (double) speed()));
 191         }
 192         else {
 193                 seek (_session.transport_frame());
 194         }
 195
 196         _last_flush_frame = _session.transport_frame();
 197 }
 198
 199 void
 200 MidiDiskstream::get_input_sources ()
 201 {
 202         uint32_t ni = _io->n_ports().n_midi();
 203
 204         if (ni == 0) {
 205                 return;
 206         }
 207
 208         // This is all we do for now at least
 209         assert(ni == 1);
 210
 211         _source_port = _io->midi(0);
 212
 213         // do... stuff?
 214 }
 215
 216 int
 217 MidiDiskstream::find_and_use_playlist (const string& name)
 218 {
 219         boost::shared_ptr<MidiPlaylist> playlist;
 220
 221         if ((playlist = boost::dynamic_pointer_cast<MidiPlaylist> (_session.playlist_by_name (name))) == 0) {
 222                 playlist = boost::dynamic_pointer_cast<MidiPlaylist> (PlaylistFactory::create (DataType::MIDI, _session, name));
 223         }
 224
 225         if (!playlist) {
 226                 error << string_compose(_("MidiDiskstream: Playlist \"%1\" isn't an midi playlist"), name) << endmsg;
 227                 return -1;
 228         }
 229
 230         return use_playlist (playlist);
 231 }
 232
 233 int
 234 MidiDiskstream::use_playlist (boost::shared_ptr<Playlist> playlist)
 235 {
 236         assert(boost::dynamic_pointer_cast<MidiPlaylist>(playlist));
 237
 238         Diskstream::use_playlist(playlist);
 239
 240         return 0;
 241 }
 242
 243 int
 244 MidiDiskstream::use_new_playlist ()
 245 {
 246         string newname;
 247         boost::shared_ptr<MidiPlaylist> playlist;
 248
 249         if (!in_set_state && destructive()) {
 250                 return 0;
 251         }
 252
 253         if (_playlist) {
 254                 newname = Playlist::bump_name (_playlist->name(), _session);
 255         } else {
 256                 newname = Playlist::bump_name (_name, _session);
 257         }
 258
 259         if ((playlist = boost::dynamic_pointer_cast<MidiPlaylist> (PlaylistFactory::create (
 260                         DataType::MIDI, _session, newname, hidden()))) != 0) {
 261
 262                 playlist->set_orig_diskstream_id (id());
 263                 return use_playlist (playlist);
 264
 265         } else {
 266                 return -1;
 267         }
 268 }
 269
 270 int
 271 MidiDiskstream::use_copy_playlist ()
 272 {
 273         assert(midi_playlist());
 274
 275         if (destructive()) {
 276                 return 0;
 277         }
 278
 279         if (_playlist == 0) {
 280                 error << string_compose(_("MidiDiskstream %1: there is no existing playlist to make a copy of!"), _name) << endmsg;
 281                 return -1;
 282         }
 283
 284         string newname;
 285         boost::shared_ptr<MidiPlaylist> playlist;
 286
 287         newname = Playlist::bump_name (_playlist->name(), _session);
 288
 289         if ((playlist  = boost::dynamic_pointer_cast<MidiPlaylist>(PlaylistFactory::create (midi_playlist(), newname))) != 0) {
 290                 playlist->set_orig_diskstream_id (id());
 291                 return use_playlist (playlist);
 292         } else {
 293                 return -1;
 294         }
 295 }
 296
 297 /** Overloaded from parent to die horribly
 298  */
 299 int
 300 MidiDiskstream::set_destructive (bool yn)
 301 {
 302         assert( ! destructive());
 303         assert( ! yn);
 304         return -1;
 305 }
 306
 307 void
 308 MidiDiskstream::set_note_mode (NoteMode m)
 309 {
 310         _note_mode = m;
 311         midi_playlist()->set_note_mode(m);
 312         if (_write_source && _write_source->model())
 313                 _write_source->model()->set_note_mode(m);
 314 }
 315
 316 void
 317 MidiDiskstream::check_record_status (nframes_t transport_frame, nframes_t /*nframes*/, bool can_record)
 318 {
 319         // FIXME: waaay too much code to duplicate (AudioDiskstream)
 320
 321         int possibly_recording;
 322         int rolling;
 323         int change;
 324         const int transport_rolling = 0x4;
 325         const int track_rec_enabled = 0x2;
 326         const int global_rec_enabled = 0x1;
 327
 328         /* merge together the 3 factors that affect record status, and compute
 329            what has changed.
 330         */
 331
 332         rolling = _session.transport_speed() != 0.0f;
 333         possibly_recording = (rolling << 2) | (record_enabled() << 1) | can_record;
 334         change = possibly_recording ^ last_possibly_recording;
 335
 336         if (possibly_recording == last_possibly_recording) {
 337                 return;
 338         }
 339
 340         /* change state */
 341
 342         /* if per-track or global rec-enable turned on while the other was already on, we've started recording */
 343
 344         if (((change & track_rec_enabled) && record_enabled() && (!(change & global_rec_enabled) && can_record)) ||
 345             ((change & global_rec_enabled) && can_record && (!(change & track_rec_enabled) && record_enabled()))) {
 346
 347                 /* starting to record: compute first+last frames */
 348
 349                 first_recordable_frame = transport_frame + _capture_offset;
 350                 last_recordable_frame = max_frames;
 351                 capture_start_frame = transport_frame;
 352
 353                 if (!(last_possibly_recording & transport_rolling) && (possibly_recording & transport_rolling)) {
 354
 355                         /* was stopped, now rolling (and recording) */
 356
 357                         if (_alignment_style == ExistingMaterial) {
 358                                 first_recordable_frame += _session.worst_output_latency();
 359                         } else {
 360                                 first_recordable_frame += _roll_delay;
 361                         }
 362
 363                 } else {
 364
 365                         /* was rolling, but record state changed */
 366
 367                         if (_alignment_style == ExistingMaterial) {
 368
 369
 370                                 if (!_session.config.get_punch_in()) {
 371
 372                                         /* manual punch in happens at the correct transport frame
 373                                            because the user hit a button. but to get alignment correct
 374                                            we have to back up the position of the new region to the
 375                                            appropriate spot given the roll delay.
 376                                         */
 377
 378                                         capture_start_frame -= _roll_delay;
 379
 380                                         /* XXX paul notes (august 2005): i don't know why
 381                                            this is needed.
 382                                         */
 383
 384                                         first_recordable_frame += _capture_offset;
 385
 386                                 } else {
 387
 388                                         /* autopunch toggles recording at the precise
 389                                            transport frame, and then the DS waits
 390                                            to start recording for a time that depends
 391                                            on the output latency.
 392                                         */
 393
 394                                         first_recordable_frame += _session.worst_output_latency();
 395                                 }
 396
 397                         } else {
 398
 399                                 if (_session.config.get_punch_in()) {
 400                                         first_recordable_frame += _roll_delay;
 401                                 } else {
 402                                         capture_start_frame -= _roll_delay;
 403                                 }
 404                         }
 405
 406                 }
 407
 408         } else if (!record_enabled() || !can_record) {
 409
 410                 /* stop recording */
 411
 412                 last_recordable_frame = transport_frame + _capture_offset;
 413
 414                 if (_alignment_style == ExistingMaterial) {
 415                         last_recordable_frame += _session.worst_output_latency();
 416                 } else {
 417                         last_recordable_frame += _roll_delay;
 418                 }
 419         }
 420
 421         last_possibly_recording = possibly_recording;
 422 }
 423
 424 #if 0
 425 static void
 426 trace_midi (ostream& o, MIDI::byte *msg, size_t len)
 427 {
 428         using namespace MIDI;
 429         eventType type;
 430         const char trace_prefix = ':';
 431
 432         type = (eventType) (msg[0]&0xF0);
 433
 434         switch (type) {
 435         case off:
 436                 o << trace_prefix
 437                    << "Channel "
 438                    << (msg[0]&0xF)+1
 439                    << " NoteOff NoteNum "
 440                    << (int) msg[1]
 441                    << " Vel "
 442                    << (int) msg[2]
 443                    << endl;
 444                 break;
 445
 446         case on:
 447                 o << trace_prefix
 448                    << "Channel "
 449                    << (msg[0]&0xF)+1
 450                    << " NoteOn NoteNum "
 451                    << (int) msg[1]
 452                    << " Vel "
 453                    << (int) msg[2]
 454                    << endl;
 455                 break;
 456
 457         case polypress:
 458                 o << trace_prefix
 459                    << "Channel "
 460                    << (msg[0]&0xF)+1
 461                    << " PolyPressure"
 462                    << (int) msg[1]
 463                    << endl;
 464                 break;
 465
 466         case MIDI::controller:
 467                 o << trace_prefix
 468                    << "Channel "
 469                    << (msg[0]&0xF)+1
 470                    << " Controller "
 471                    << (int) msg[1]
 472                    << " Value "
 473                    << (int) msg[2]
 474                    << endl;
 475                 break;
 476
 477         case program:
 478                 o << trace_prefix
 479                    << "Channel "
 480                    << (msg[0]&0xF)+1
 481                    <<  " Program Change ProgNum "
 482                    << (int) msg[1]
 483                    << endl;
 484                 break;
 485
 486         case chanpress:
 487                 o << trace_prefix
 488                    << "Channel "
 489                    << (msg[0]&0xF)+1
 490                    << " Channel Pressure "
 491                    << (int) msg[1]
 492                    << endl;
 493                 break;
 494
 495         case MIDI::pitchbend:
 496                 o << trace_prefix
 497                    << "Channel "
 498                    << (msg[0]&0xF)+1
 499                    << " Pitch Bend "
 500                    << ((msg[2]<<7)|msg[1])
 501                    << endl;
 502                 break;
 503
 504         case MIDI::sysex:
 505                 if (len == 1) {
 506                         switch (msg[0]) {
 507                         case 0xf8:
 508                                 o << trace_prefix
 509                                    << "Clock"
 510                                    << endl;
 511                                 break;
 512                         case 0xfa:
 513                                 o << trace_prefix
 514                                    << "Start"
 515                                    << endl;
 516                                 break;
 517                         case 0xfb:
 518                                 o << trace_prefix
 519                                    << "Continue"
 520                                    << endl;
 521                                 break;
 522                         case 0xfc:
 523                                 o << trace_prefix
 524                                    << "Stop"
 525                                    << endl;
 526                                 break;
 527                         case 0xfe:
 528                                 o << trace_prefix
 529                                    << "Active Sense"
 530                                    << endl;
 531                                 break;
 532                         case 0xff:
 533                                 o << trace_prefix
 534                                    << "System Reset"
 535                                    << endl;
 536                                 break;
 537                         default:
 538                                 o << trace_prefix
 539                                    << "System Exclusive (1 byte : " << hex << (int) *msg << dec << ')'
 540                                    << endl;
 541                                 break;
 542                         }
 543                 } else {
 544                         o << trace_prefix
 545                            << "System Exclusive (" << len << ") = [ " << hex;
 546                         for (unsigned int i = 0; i < len; ++i) {
 547                                 o << (int) msg[i] << ' ';
 548                         }
 549                         o << dec << ']' << endl;
 550
 551                 }
 552                 break;
 553
 554         case MIDI::song:
 555                 o << trace_prefix << "Song" << endl;
 556                 break;
 557
 558         case MIDI::tune:
 559                 o << trace_prefix << "Tune" << endl;
 560                 break;
 561
 562         case MIDI::eox:
 563                 o << trace_prefix << "End-of-System Exclusive" << endl;
 564                 break;
 565
 566         case MIDI::timing:
 567                 o << trace_prefix << "Timing" << endl;
 568                 break;
 569
 570         case MIDI::start:
 571                 o << trace_prefix << "Start" << endl;
 572                 break;
 573
 574         case MIDI::stop:
 575                 o << trace_prefix << "Stop" << endl;
 576                 break;
 577
 578         case MIDI::contineu:
 579                 o << trace_prefix << "Continue" << endl;
 580                 break;
 581
 582         case active:
 583                 o << trace_prefix << "Active Sense" << endl;
 584                 break;
 585
 586         default:
 587                 o << trace_prefix << "Unrecognized MIDI message" << endl;
 588                 break;
 589         }
 590 }
 591 #endif
 592
 593 int
 594 MidiDiskstream::process (nframes_t transport_frame, nframes_t nframes, bool can_record, bool rec_monitors_input)
 595 {
 596         // FIXME: waay too much code to duplicate (AudioDiskstream::process)
 597         int       ret = -1;
 598         nframes_t rec_offset = 0;
 599         nframes_t rec_nframes = 0;
 600         bool      nominally_recording;
 601         bool      re = record_enabled ();
 602
 603         /* if we've already processed the frames corresponding to this call,
 604            just return. this allows multiple routes that are taking input
 605            from this diskstream to call our ::process() method, but have
 606            this stuff only happen once. more commonly, it allows both
 607            the AudioTrack that is using this AudioDiskstream *and* the Session
 608            to call process() without problems.
 609            */
 610
 611         if (_processed) {
 612                 return 0;
 613         }
 614
 615         commit_should_unlock = false;
 616
 617         check_record_status (transport_frame, nframes, can_record);
 618
 619         nominally_recording = (can_record && re);
 620
 621         if (nframes == 0) {
 622                 _processed = true;
 623                 return 0;
 624         }
 625
 626         /* This lock is held until the end of ::commit, so these two functions
 627            must always be called as a pair. The only exception is if this function
 628            returns a non-zero value, in which case, ::commit should not be called.
 629            */
 630
 631         // If we can't take the state lock return.
 632         if (!state_lock.trylock()) {
 633                 return 1;
 634         }
 635         commit_should_unlock = true;
 636         adjust_capture_position = 0;
 637
 638         if (nominally_recording || (_session.get_record_enabled() && _session.config.get_punch_in())) {
 639                 OverlapType ot;
 640
 641                 ot = coverage (first_recordable_frame, last_recordable_frame, transport_frame, transport_frame + nframes);
 642
 643                 switch (ot) {
 644                         case OverlapNone:
 645                                 rec_nframes = 0;
 646                                 break;
 647
 648                         case OverlapInternal:
 649                                 /*     ----------    recrange
 650                                            |---|       transrange
 651                                            */
 652                                 rec_nframes = nframes;
 653                                 rec_offset = 0;
 654                                 break;
 655
 656                         case OverlapStart:
 657                                 /*    |--------|    recrange
 658                                           -----|          transrange
 659                                           */
 660                                 rec_nframes = transport_frame + nframes - first_recordable_frame;
 661                                 if (rec_nframes) {
 662                                         rec_offset = first_recordable_frame - transport_frame;
 663                                 }
 664                                 break;
 665
 666                         case OverlapEnd:
 667                                 /*    |--------|    recrange
 668                                           |--------  transrange
 669                                           */
 670                                 rec_nframes = last_recordable_frame - transport_frame;
 671                                 rec_offset = 0;
 672                                 break;
 673
 674                         case OverlapExternal:
 675                                 /*    |--------|    recrange
 676                                           --------------  transrange
 677                                           */
 678                                 rec_nframes = last_recordable_frame - last_recordable_frame;
 679                                 rec_offset = first_recordable_frame - transport_frame;
 680                                 break;
 681                 }
 682
 683                 if (rec_nframes && !was_recording) {
 684                         capture_captured = 0;
 685                         was_recording = true;
 686                 }
 687         }
 688
 689
 690         if (can_record && !_last_capture_regions.empty()) {
 691                 _last_capture_regions.clear ();
 692         }
 693
 694         if (nominally_recording || rec_nframes) {
 695
 696                 // Pump entire port buffer into the ring buffer (FIXME: split cycles?)
 697                 MidiBuffer& buf = _source_port->get_midi_buffer(nframes);
 698                 for (MidiBuffer::iterator i = buf.begin(); i != buf.end(); ++i) {
 699                         const Evoral::MIDIEvent<MidiBuffer::TimeType> ev(*i, false);
 700                         assert(ev.buffer());
 701                         _capture_buf->write(ev.time() + transport_frame, ev.type(), ev.size(), ev.buffer());
 702                 }
 703
 704         } else {
 705
 706                 if (was_recording) {
 707                         finish_capture (rec_monitors_input);
 708                 }
 709
 710         }
 711
 712         if (rec_nframes) {
 713
 714                 /* data will be written to disk */
 715
 716                 if (rec_nframes == nframes && rec_offset == 0) {
 717                         playback_distance = nframes;
 718                 }
 719
 720                 adjust_capture_position = rec_nframes;
 721
 722         } else if (nominally_recording) {
 723
 724                 /* XXXX do this for MIDI !!!
 725                    can't do actual capture yet - waiting for latency effects to finish before we start
 726                 */
 727
 728                 playback_distance = nframes;
 729
 730         }
 731
 732         ret = 0;
 733
 734         _processed = true;
 735
 736         if (ret) {
 737
 738                 /* we're exiting with failure, so ::commit will not
 739                    be called. unlock the state lock.
 740                    */
 741
 742                 commit_should_unlock = false;
 743                 state_lock.unlock();
 744         }
 745
 746         return ret;
 747 }
 748
 749 bool
 750 MidiDiskstream::commit (nframes_t nframes)
 751 {
 752         bool need_butler = false;
 753
 754         if (_actual_speed < 0.0) {
 755                 playback_sample -= playback_distance;
 756         } else {
 757                 playback_sample += playback_distance;
 758         }
 759
 760         if (adjust_capture_position != 0) {
 761                 capture_captured += adjust_capture_position;
 762                 adjust_capture_position = 0;
 763         }
 764
 765         uint32_t frames_read = g_atomic_int_get(&_frames_read_from_ringbuffer);
 766         uint32_t frames_written = g_atomic_int_get(&_frames_written_to_ringbuffer);
 767         if ((frames_written - frames_read) + nframes < midi_readahead) {
 768                 need_butler = true;
 769         }
 770
 771         /*cerr << "MDS written: " << frames_written << " - read: " << frames_read <<
 772                 " = " << frames_written - frames_read
 773                 << " + " << nframes << " < " << midi_readahead << " = " << need_butler << ")" << endl;*/
 774
 775         if (commit_should_unlock) {
 776                 state_lock.unlock();
 777         }
 778
 779         _processed = false;
 780
 781         return need_butler;
 782 }
 783
 784 void
 785 MidiDiskstream::set_pending_overwrite (bool yn)
 786 {
 787         /* called from audio thread, so we can use the read ptr and playback sample as we wish */
 788
 789         pending_overwrite = yn;
 790
 791         overwrite_frame = playback_sample;
 792 }
 793
 794 int
 795 MidiDiskstream::overwrite_existing_buffers ()
 796 {
 797         //read(overwrite_frame, disk_io_chunk_frames, false);
 798         overwrite_queued = false;
 799         pending_overwrite = false;
 800
 801         return 0;
 802 }
 803
 804 int
 805 MidiDiskstream::seek (nframes_t frame, bool complete_refill)
 806 {
 807         Glib::Mutex::Lock lm (state_lock);
 808         int ret = -1;
 809
 810         _playback_buf->reset();
 811         _capture_buf->reset();
 812         g_atomic_int_set(&_frames_read_from_ringbuffer, 0);
 813         g_atomic_int_set(&_frames_written_to_ringbuffer, 0);
 814
 815         playback_sample = frame;
 816         file_frame = frame;
 817
 818         if (complete_refill) {
 819                 while ((ret = do_refill_with_alloc ()) > 0) ;
 820         } else {
 821                 ret = do_refill_with_alloc ();
 822         }
 823
 824         return ret;
 825 }
 826
 827 int
 828 MidiDiskstream::can_internal_playback_seek (nframes_t distance)
 829 {
 830         uint32_t frames_read    = g_atomic_int_get(&_frames_read_from_ringbuffer);
 831         uint32_t frames_written = g_atomic_int_get(&_frames_written_to_ringbuffer);
 832         return ((frames_written - frames_read) < distance);
 833 }
 834
 835 int
 836 MidiDiskstream::internal_playback_seek (nframes_t distance)
 837 {
 838         first_recordable_frame += distance;
 839         playback_sample += distance;
 840
 841         return 0;
 842 }
 843
 844 /** @a start is set to the new frame position (TIME) read up to */
 845 int
 846 MidiDiskstream::read (nframes_t& start, nframes_t dur, bool reversed)
 847 {
 848         nframes_t this_read = 0;
 849         bool reloop = false;
 850         nframes_t loop_end = 0;
 851         nframes_t loop_start = 0;
 852         nframes_t loop_length = 0;
 853         Location *loc = 0;
 854
 855         if (!reversed) {
 856                 /* Make the use of a Location atomic for this read operation.
 857
 858                    Note: Locations don't get deleted, so all we care about
 859                    when I say "atomic" is that we are always pointing to
 860                    the same one and using a start/length values obtained
 861                    just once.
 862                 */
 863
 864                 if ((loc = loop_location) != 0) {
 865                         loop_start = loc->start();
 866                         loop_end = loc->end();
 867                         loop_length = loop_end - loop_start;
 868                 }
 869
 870                 /* if we are looping, ensure that the first frame we read is at the correct
 871                    position within the loop.
 872                 */
 873
 874                 if (loc && (start >= loop_end)) {
 875                         //cerr << "start adjusted from " << start;
 876                         start = loop_start + ((start - loop_start) % loop_length);
 877                         //cerr << "to " << start << endl;
 878                 }
 879                 //cerr << "start is " << start << "  loopstart: " << loop_start << "  loopend: " << loop_end << endl;
 880         }
 881
 882         while (dur) {
 883
 884                 /* take any loop into account. we can't read past the end of the loop. */
 885
 886                 if (loc && (loop_end - start < dur)) {
 887                         this_read = loop_end - start;
 888                         //cerr << "reloop true: thisread: " << this_read << "  dur: " << dur << endl;
 889                         reloop = true;
 890                 } else {
 891                         reloop = false;
 892                         this_read = dur;
 893                 }
 894
 895                 if (this_read == 0) {
 896                         break;
 897                 }
 898
 899                 this_read = min(dur,this_read);
 900
 901                 if (midi_playlist()->read (*_playback_buf, start, this_read) != this_read) {
 902                         error << string_compose(
 903                                         _("MidiDiskstream %1: cannot read %2 from playlist at frame %3"),
 904                                         _id, this_read, start) << endmsg;
 905                         return -1;
 906                 }
 907
 908                 g_atomic_int_add(&_frames_written_to_ringbuffer, this_read);
 909
 910                 _read_data_count = _playlist->read_data_count();
 911
 912                 if (reversed) {
 913
 914                         // Swap note ons with note offs here.  etc?
 915                         // Fully reversing MIDI requires look-ahead (well, behind) to find previous
 916                         // CC values etc.  hard.
 917
 918                 } else {
 919
 920                         /* if we read to the end of the loop, go back to the beginning */
 921
 922                         if (reloop) {
 923                                 // Synthesize LoopEvent here, because the next events
 924                                 // written will have non-monotonic timestamps.
 925                                 _playback_buf->write(loop_end - 1, LoopEventType, 0, 0);
 926                                 cout << "Pushing LoopEvent ts=" << loop_end-1
 927                                      << " start+this_read " << start+this_read << endl;
 928
 929                                 start = loop_start;
 930                         } else {
 931                                 start += this_read;
 932                         }
 933                 }
 934
 935                 dur -= this_read;
 936                 //offset += this_read;
 937         }
 938
 939         return 0;
 940 }
 941
 942 int
 943 MidiDiskstream::do_refill_with_alloc ()
 944 {
 945         return do_refill();
 946 }
 947
 948 int
 949 MidiDiskstream::do_refill ()
 950 {
 951         int     ret         = 0;
 952         size_t  write_space = _playback_buf->write_space();
 953         bool    reversed    = (_visible_speed * _session.transport_speed()) < 0.0f;
 954
 955         if (write_space == 0) {
 956                 return 0;
 957         }
 958
 959         if (reversed) {
 960                 return 0;
 961         }
 962
 963         /* at end: nothing to do */
 964         if (file_frame == max_frames) {
 965                 return 0;
 966         }
 967
 968         // At this point we...
 969         assert(_playback_buf->write_space() > 0); // ... have something to write to, and
 970         assert(file_frame <= max_frames); // ... something to write
 971
 972         // now calculate how much time is in the ringbuffer.
 973         // and lets write as much as we need to get this to be midi_readahead;
 974         uint32_t frames_read = g_atomic_int_get(&_frames_read_from_ringbuffer);
 975         uint32_t frames_written = g_atomic_int_get(&_frames_written_to_ringbuffer);
 976         if ((frames_written - frames_read) >= midi_readahead) {
 977                 //cout << "MDS Nothing to do. all fine" << endl;
 978                 return 0;
 979         }
 980
 981         nframes_t to_read = midi_readahead - (frames_written - frames_read);
 982
 983         //cout << "MDS read for midi_readahead " << to_read << "  rb_contains: "
 984         //      << frames_written - frames_read << endl;
 985
 986         to_read = min(to_read, (max_frames - file_frame));
 987
 988         if (read (file_frame, to_read, reversed)) {
 989                 ret = -1;
 990         }
 991
 992         return ret;
 993 }
 994
 995 /** Flush pending data to disk.
 996  *
 997  * Important note: this function will write *AT MOST* disk_io_chunk_frames
 998  * of data to disk. it will never write more than that.  If it writes that
 999  * much and there is more than that waiting to be written, it will return 1,
1000  * otherwise 0 on success or -1 on failure.
1001  *
1002  * If there is less than disk_io_chunk_frames to be written, no data will be
1003  * written at all unless @a force_flush is true.
1004  */
1005 int
1006 MidiDiskstream::do_flush (RunContext /*context*/, bool force_flush)
1007 {
1008         uint32_t to_write;
1009         int32_t ret = 0;
1010         nframes_t total;
1011
1012         _write_data_count = 0;
1013
1014         total = _session.transport_frame() - _last_flush_frame;
1015
1016         if (_last_flush_frame > _session.transport_frame()
1017                         || _last_flush_frame < capture_start_frame) {
1018                 _last_flush_frame = _session.transport_frame();
1019         }
1020
1021         if (total == 0 || _capture_buf->read_space() == 0
1022                         || (!force_flush && (total < disk_io_chunk_frames && was_recording))) {
1023                 goto out;
1024         }
1025
1026         /* if there are 2+ chunks of disk i/o possible for
1027            this track, let the caller know so that it can arrange
1028            for us to be called again, ASAP.
1029
1030            if we are forcing a flush, then if there is* any* extra
1031            work, let the caller know.
1032
1033            if we are no longer recording and there is any extra work,
1034            let the caller know too.
1035            */
1036
1037         if (total >= 2 * disk_io_chunk_frames || ((force_flush || !was_recording) && total > disk_io_chunk_frames)) {
1038                 ret = 1;
1039         }
1040
1041         to_write = disk_io_chunk_frames;
1042
1043         assert(!destructive());
1044
1045         if (record_enabled()
1046                         && (   (_session.transport_frame() - _last_flush_frame > disk_io_chunk_frames)
1047                                 || force_flush)) {
1048                 if ((!_write_source) || _write_source->midi_write (*_capture_buf, capture_start_frame, to_write) != to_write) {
1049                         error << string_compose(_("MidiDiskstream %1: cannot write to disk"), _id) << endmsg;
1050                         return -1;
1051                 } else {
1052                         _last_flush_frame = _session.transport_frame();
1053                 }
1054         }
1055
1056 out:
1057         return ret;
1058 }
1059
1060 void
1061 MidiDiskstream::transport_stopped (struct tm& /*when*/, time_t /*twhen*/, bool abort_capture)
1062 {
1063         uint32_t buffer_position;
1064         bool more_work = true;
1065         int err = 0;
1066         boost::shared_ptr<MidiRegion> region;
1067         nframes_t total_capture;
1068         MidiRegion::SourceList srcs;
1069         MidiRegion::SourceList::iterator src;
1070         vector<CaptureInfo*>::iterator ci;
1071         bool mark_write_completed = false;
1072
1073         finish_capture (true);
1074
1075         /* butler is already stopped, but there may be work to do
1076            to flush remaining data to disk.
1077            */
1078
1079         while (more_work && !err) {
1080                 switch (do_flush (TransportContext, true)) {
1081                         case 0:
1082                                 more_work = false;
1083                                 break;
1084                         case 1:
1085                                 break;
1086                         case -1:
1087                                 error << string_compose(_("MidiDiskstream \"%1\": cannot flush captured data to disk!"), _name) << endmsg;
1088                                 err++;
1089                 }
1090         }
1091
1092         /* XXX is there anything we can do if err != 0 ? */
1093         Glib::Mutex::Lock lm (capture_info_lock);
1094
1095         if (capture_info.empty()) {
1096                 return;
1097         }
1098
1099         if (abort_capture) {
1100
1101                 if (_write_source) {
1102
1103                         _write_source->mark_for_remove ();
1104                         _write_source->drop_references ();
1105                         _write_source.reset();
1106                 }
1107
1108                 /* new source set up in "out" below */
1109
1110         } else {
1111
1112                 assert(_write_source);
1113
1114                 for (total_capture = 0, ci = capture_info.begin(); ci != capture_info.end(); ++ci) {
1115                         total_capture += (*ci)->frames;
1116                 }
1117
1118                 /* figure out the name for this take */
1119
1120                 srcs.push_back (_write_source);
1121                 _write_source->set_timeline_position (capture_info.front()->start);
1122                 _write_source->set_captured_for (_name);
1123
1124                 string whole_file_region_name;
1125                 whole_file_region_name = region_name_from_path (_write_source->name(), true);
1126
1127                 /* Register a new region with the Session that
1128                    describes the entire source. Do this first
1129                    so that any sub-regions will obviously be
1130                    children of this one (later!)
1131                    */
1132
1133                 try {
1134                         boost::shared_ptr<Region> rx (RegionFactory::create (srcs, 0,
1135                                         total_capture, whole_file_region_name, 0,
1136                                         Region::Flag (Region::DefaultFlags|Region::Automatic|Region::WholeFile)));
1137
1138                         region = boost::dynamic_pointer_cast<MidiRegion> (rx);
1139                         region->special_set_position (capture_info.front()->start);
1140                 }
1141
1142
1143                 catch (failed_constructor& err) {
1144                         error << string_compose(_("%1: could not create region for complete midi file"), _name) << endmsg;
1145                         /* XXX what now? */
1146                 }
1147
1148                 _last_capture_regions.push_back (region);
1149
1150                 // cerr << _name << ": there are " << capture_info.size() << " capture_info records\n";
1151
1152                 XMLNode &before = _playlist->get_state();
1153                 _playlist->freeze ();
1154
1155                 for (buffer_position = 0, ci = capture_info.begin(); ci != capture_info.end(); ++ci) {
1156
1157                         string region_name;
1158
1159                         _session.region_name (region_name, _write_source->name(), false);
1160
1161                         // cerr << _name << ": based on ci of " << (*ci)->start << " for " << (*ci)->frames << " add a region\n";
1162
1163                         try {
1164                                 boost::shared_ptr<Region> rx (RegionFactory::create (srcs, buffer_position, (*ci)->frames, region_name));
1165                                 region = boost::dynamic_pointer_cast<MidiRegion> (rx);
1166                         }
1167
1168                         catch (failed_constructor& err) {
1169                                 error << _("MidiDiskstream: could not create region for captured midi!") << endmsg;
1170                                 continue; /* XXX is this OK? */
1171                         }
1172
1173                         region->GoingAway.connect (bind (mem_fun (*this, &Diskstream::remove_region_from_last_capture), boost::weak_ptr<Region>(region)));
1174
1175                         _last_capture_regions.push_back (region);
1176
1177                         // cerr << "add new region, buffer position = " << buffer_position << " @ " << (*ci)->start << endl;
1178
1179                         i_am_the_modifier++;
1180                         _playlist->add_region (region, (*ci)->start);
1181                         i_am_the_modifier--;
1182
1183                         buffer_position += (*ci)->frames;
1184                 }
1185
1186                 _playlist->thaw ();
1187                 XMLNode &after = _playlist->get_state();
1188                 _session.add_command (new MementoCommand<Playlist>(*_playlist, &before, &after));
1189
1190         }
1191
1192         mark_write_completed = true;
1193
1194         reset_write_sources (mark_write_completed);
1195
1196         for (ci = capture_info.begin(); ci != capture_info.end(); ++ci) {
1197                 delete *ci;
1198         }
1199
1200         capture_info.clear ();
1201         capture_start_frame = 0;
1202 }
1203
1204 void
1205 MidiDiskstream::transport_looped (nframes_t transport_frame)
1206 {
1207         if (was_recording) {
1208
1209                 // adjust the capture length knowing that the data will be recorded to disk
1210                 // only necessary after the first loop where we're recording
1211                 if (capture_info.size() == 0) {
1212                         capture_captured += _capture_offset;
1213
1214                         if (_alignment_style == ExistingMaterial) {
1215                                 capture_captured += _session.worst_output_latency();
1216                         } else {
1217                                 capture_captured += _roll_delay;
1218                         }
1219                 }
1220
1221                 finish_capture (true);
1222
1223                 // the next region will start recording via the normal mechanism
1224                 // we'll set the start position to the current transport pos
1225                 // no latency adjustment or capture offset needs to be made, as that already happened the first time
1226                 capture_start_frame = transport_frame;
1227                 first_recordable_frame = transport_frame; // mild lie
1228                 last_recordable_frame = max_frames;
1229                 was_recording = true;
1230         }
1231 }
1232
1233 void
1234 MidiDiskstream::finish_capture (bool /*rec_monitors_input*/)
1235 {
1236         was_recording = false;
1237
1238         if (capture_captured == 0) {
1239                 return;
1240         }
1241
1242         // Why must we destroy?
1243         assert(!destructive());
1244
1245         CaptureInfo* ci = new CaptureInfo;
1246
1247         ci->start  = capture_start_frame;
1248         ci->frames = capture_captured;
1249
1250         /* XXX theoretical race condition here. Need atomic exchange ?
1251            However, the circumstances when this is called right
1252            now (either on record-disable or transport_stopped)
1253            mean that no actual race exists. I think ...
1254            We now have a capture_info_lock, but it is only to be used
1255            to synchronize in the transport_stop and the capture info
1256            accessors, so that invalidation will not occur (both non-realtime).
1257         */
1258
1259         // cerr << "Finish capture, add new CI, " << ci->start << '+' << ci->frames << endl;
1260
1261         capture_info.push_back (ci);
1262         capture_captured = 0;
1263 }
1264
1265 void
1266 MidiDiskstream::set_record_enabled (bool yn)
1267 {
1268         if (!recordable() || !_session.record_enabling_legal()) {
1269                 return;
1270         }
1271
1272         assert(!destructive());
1273
1274         if (yn && _source_port == 0) {
1275
1276                 /* pick up connections not initiated *from* the IO object
1277                    we're associated with.
1278                 */
1279
1280                 get_input_sources ();
1281         }
1282
1283         /* yes, i know that this not proof against race conditions, but its
1284            good enough. i think.
1285         */
1286
1287         if (record_enabled() != yn) {
1288                 if (yn) {
1289                         engage_record_enable ();
1290                 } else {
1291                         disengage_record_enable ();
1292                 }
1293         }
1294 }
1295
1296 void
1297 MidiDiskstream::engage_record_enable ()
1298 {
1299     bool rolling = _session.transport_speed() != 0.0f;
1300
1301         g_atomic_int_set (&_record_enabled, 1);
1302
1303         if (_source_port && Config->get_monitoring_model() == HardwareMonitoring) {
1304                 _source_port->request_monitor_input (!(_session.config.get_auto_input() && rolling));
1305         }
1306
1307         // FIXME: Why is this necessary?  Isn't needed for AudioDiskstream...
1308         if (!_write_source)
1309                 use_new_write_source();
1310
1311         _write_source->mark_streaming_midi_write_started (_note_mode, _session.transport_frame());
1312
1313         RecordEnableChanged (); /* EMIT SIGNAL */
1314 }
1315
1316 void
1317 MidiDiskstream::disengage_record_enable ()
1318 {
1319         g_atomic_int_set (&_record_enabled, 0);
1320         if (_source_port && Config->get_monitoring_model() == HardwareMonitoring) {
1321                 if (_source_port) {
1322                         _source_port->request_monitor_input (false);
1323                 }
1324         }
1325
1326         RecordEnableChanged (); /* EMIT SIGNAL */
1327 }
1328
1329 XMLNode&
1330 MidiDiskstream::get_state ()
1331 {
1332         XMLNode* node = new XMLNode ("MidiDiskstream");
1333         char buf[64];
1334         LocaleGuard lg (X_("POSIX"));
1335
1336         snprintf (buf, sizeof(buf), "0x%x", _flags);
1337         node->add_property ("flags", buf);
1338
1339         node->add_property("channel-mode", enum_2_string(get_channel_mode()));
1340
1341         snprintf (buf, sizeof(buf), "0x%x", get_channel_mask());
1342         node->add_property("channel-mask", buf);
1343
1344         node->add_property ("playlist", _playlist->name());
1345
1346         snprintf (buf, sizeof(buf), "%f", _visible_speed);
1347         node->add_property ("speed", buf);
1348
1349         node->add_property("name", _name);
1350         id().print(buf, sizeof(buf));
1351         node->add_property("id", buf);
1352
1353         if (_write_source && _session.get_record_enabled()) {
1354
1355                 XMLNode* cs_child = new XMLNode (X_("CapturingSources"));
1356                 XMLNode* cs_grandchild;
1357
1358                 cs_grandchild = new XMLNode (X_("file"));
1359                 cs_grandchild->add_property (X_("path"), _write_source->path());
1360                 cs_child->add_child_nocopy (*cs_grandchild);
1361
1362                 /* store the location where capture will start */
1363
1364                 Location* pi;
1365
1366                 if (_session.config.get_punch_in() && ((pi = _session.locations()->auto_punch_location()) != 0)) {
1367                         snprintf (buf, sizeof (buf), "%" PRId64, pi->start());
1368                 } else {
1369                         snprintf (buf, sizeof (buf), "%" PRIu32, _session.transport_frame());
1370                 }
1371
1372                 cs_child->add_property (X_("at"), buf);
1373                 node->add_child_nocopy (*cs_child);
1374         }
1375
1376         if (_extra_xml) {
1377                 node->add_child_copy (*_extra_xml);
1378         }
1379
1380         return* node;
1381 }
1382
1383 int
1384 MidiDiskstream::set_state (const XMLNode& node, int version)
1385 {
1386         const XMLProperty* prop;
1387         XMLNodeList nlist = node.children();
1388         XMLNodeIterator niter;
1389         uint32_t nchans = 1;
1390         XMLNode* capture_pending_node = 0;
1391         LocaleGuard lg (X_("POSIX"));
1392
1393         in_set_state = true;
1394
1395         for (niter = nlist.begin(); niter != nlist.end(); ++niter) {
1396                 /*if ((*niter)->name() == IO::state_node_name) {
1397                         deprecated_io_node = new XMLNode (**niter);
1398                 }*/
1399                 assert ((*niter)->name() != IO::state_node_name);
1400
1401                 if ((*niter)->name() == X_("CapturingSources")) {
1402                         capture_pending_node = *niter;
1403                 }
1404         }
1405
1406         /* prevent write sources from being created */
1407
1408         in_set_state = true;
1409
1410         if ((prop = node.property ("name")) != 0) {
1411                 _name = prop->value();
1412         }
1413
1414         if ((prop = node.property ("id")) != 0) {
1415                 _id = prop->value ();
1416         }
1417
1418         if ((prop = node.property ("flags")) != 0) {
1419                 _flags = Flag (string_2_enum (prop->value(), _flags));
1420         }
1421
1422         ChannelMode channel_mode = AllChannels;
1423         if ((prop = node.property ("channel-mode")) != 0) {
1424                 channel_mode = ChannelMode (string_2_enum(prop->value(), channel_mode));
1425         }
1426
1427         unsigned int channel_mask = 0xFFFF;
1428         if ((prop = node.property ("channel-mask")) != 0) {
1429                 sscanf (prop->value().c_str(), "0x%x", &channel_mask);
1430                 if (channel_mask & (~0xFFFF)) {
1431                         warning << _("MidiDiskstream: XML property channel-mask out of range") << endmsg;
1432                 }
1433         }
1434
1435         set_channel_mode(channel_mode, channel_mask);
1436
1437         if ((prop = node.property ("channels")) != 0) {
1438                 nchans = atoi (prop->value().c_str());
1439         }
1440
1441         if ((prop = node.property ("playlist")) == 0) {
1442                 return -1;
1443         }
1444
1445         {
1446                 bool had_playlist = (_playlist != 0);
1447
1448                 if (find_and_use_playlist (prop->value())) {
1449                         return -1;
1450                 }
1451
1452                 if (!had_playlist) {
1453                         _playlist->set_orig_diskstream_id (_id);
1454                 }
1455
1456                 if (capture_pending_node) {
1457                         use_pending_capture_data (*capture_pending_node);
1458                 }
1459
1460         }
1461
1462         if ((prop = node.property ("speed")) != 0) {
1463                 double sp = atof (prop->value().c_str());
1464
1465                 if (realtime_set_speed (sp, false)) {
1466                         non_realtime_set_speed ();
1467                 }
1468         }
1469
1470         in_set_state = false;
1471
1472         /* make sure this is clear before we do anything else */
1473
1474         // FIXME?
1475         //_capturing_source = 0;
1476
1477         /* write sources are handled when we handle the input set
1478            up of the IO that owns this DS (::non_realtime_input_change())
1479         */
1480
1481         in_set_state = false;
1482
1483         return 0;
1484 }
1485
1486 int
1487 MidiDiskstream::use_new_write_source (uint32_t n)
1488 {
1489         if (!recordable()) {
1490                 return 1;
1491         }
1492
1493         assert(n == 0);
1494
1495         if (_write_source) {
1496
1497                 if (_write_source->is_empty ()) {
1498                         _write_source->mark_for_remove ();
1499                         _write_source.reset();
1500                 } else {
1501                         _write_source.reset();
1502                 }
1503         }
1504
1505         try {
1506                 _write_source = boost::dynamic_pointer_cast<SMFSource>(_session.create_midi_source_for_session (*this));
1507                 if (!_write_source) {
1508                         throw failed_constructor();
1509                 }
1510         }
1511
1512         catch (failed_constructor &err) {
1513                 error << string_compose (_("%1:%2 new capture file not initialized correctly"), _name, n) << endmsg;
1514                 _write_source.reset();
1515                 return -1;
1516         }
1517
1518         _write_source->set_allow_remove_if_empty (true);
1519
1520         return 0;
1521 }
1522
1523 void
1524 MidiDiskstream::reset_write_sources (bool mark_write_complete, bool /*force*/)
1525 {
1526         if (!recordable()) {
1527                 return;
1528         }
1529
1530         if (_write_source && mark_write_complete) {
1531                 _write_source->mark_streaming_write_completed ();
1532         }
1533
1534         use_new_write_source (0);
1535
1536         if (record_enabled()) {
1537                 //_capturing_sources.push_back (_write_source);
1538         }
1539 }
1540
1541 int
1542 MidiDiskstream::rename_write_sources ()
1543 {
1544         if (_write_source != 0) {
1545                 _write_source->set_source_name (_name, destructive());
1546                 /* XXX what to do if this fails ? */
1547         }
1548         return 0;
1549 }
1550
1551 void
1552 MidiDiskstream::set_block_size (nframes_t /*nframes*/)
1553 {
1554 }
1555
1556 void
1557 MidiDiskstream::allocate_temporary_buffers ()
1558 {
1559 }
1560
1561 void
1562 MidiDiskstream::monitor_input (bool yn)
1563 {
1564         if (_source_port)
1565                 _source_port->ensure_monitor_input (yn);
1566 }
1567
1568 void
1569 MidiDiskstream::set_align_style_from_io ()
1570 {
1571         bool have_physical = false;
1572
1573         if (_io == 0) {
1574                 return;
1575         }
1576
1577         get_input_sources ();
1578
1579         if (_source_port && _source_port->flags() & JackPortIsPhysical) {
1580                 have_physical = true;
1581         }
1582
1583         if (have_physical) {
1584                 set_align_style (ExistingMaterial);
1585         } else {
1586                 set_align_style (CaptureTime);
1587         }
1588 }
1589
1590
1591 float
1592 MidiDiskstream::playback_buffer_load () const
1593 {
1594         return (float) ((double) _playback_buf->read_space()/
1595                         (double) _playback_buf->capacity());
1596 }
1597
1598 float
1599 MidiDiskstream::capture_buffer_load () const
1600 {
1601         return (float) ((double) _capture_buf->write_space()/
1602                         (double) _capture_buf->capacity());
1603 }
1604
1605 int
1606 MidiDiskstream::use_pending_capture_data (XMLNode& /*node*/)
1607 {
1608         return 0;
1609 }
1610
1611 /** Writes playback events in the given range to \a dst, translating time stamps
1612  * so that an event at \a start has time = 0
1613  */
1614 void
1615 MidiDiskstream::get_playback (MidiBuffer& dst, nframes_t start, nframes_t end)
1616 {
1617         dst.clear();
1618         assert(dst.size() == 0);
1619
1620         // Reverse.  ... We just don't do reverse, ok?  Back off.
1621         if (end <= start) {
1622                 return;
1623         }
1624
1625         // Translates stamps to be relative to start
1626
1627         _playback_buf->read(dst, start, end);
1628
1629 #if 0
1630         const size_t events_read = _playback_buf->read(dst, start, end);
1631         cout << _name << ": MDS events read = " << events_read
1632              << " start = " << start << " end = " << end
1633              << " readspace " << _playback_buf->read_space()
1634              << " writespace " << _playback_buf->write_space() << endl;
1635 #endif
1636
1637         gint32 frames_read = end - start;
1638         g_atomic_int_add(&_frames_read_from_ringbuffer, frames_read);
1639 }
1640