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                         /* put it in the playback buffer as well, so that we can monitor */
 704
 705                         _playback_buf->write(ev.time() + transport_frame, ev.type(), ev.size(), ev.buffer());
 706                 }
 707
 708         } else {
 709
 710                 if (was_recording) {
 711                         finish_capture (rec_monitors_input);
 712                 }
 713
 714         }
 715
 716         if (rec_nframes) {
 717
 718                 /* data will be written to disk */
 719
 720                 if (rec_nframes == nframes && rec_offset == 0) {
 721                         playback_distance = nframes;
 722                 }
 723
 724                 adjust_capture_position = rec_nframes;
 725
 726         } else if (nominally_recording) {
 727
 728                 /* XXXX do this for MIDI !!!
 729                    can't do actual capture yet - waiting for latency effects to finish before we start
 730                 */
 731
 732                 playback_distance = nframes;
 733
 734         }
 735
 736         ret = 0;
 737
 738         _processed = true;
 739
 740         if (ret) {
 741
 742                 /* we're exiting with failure, so ::commit will not
 743                    be called. unlock the state lock.
 744                    */
 745
 746                 commit_should_unlock = false;
 747                 state_lock.unlock();
 748         }
 749
 750         return ret;
 751 }
 752
 753 bool
 754 MidiDiskstream::commit (nframes_t nframes)
 755 {
 756         bool need_butler = false;
 757
 758         if (_actual_speed < 0.0) {
 759                 playback_sample -= playback_distance;
 760         } else {
 761                 playback_sample += playback_distance;
 762         }
 763
 764         if (adjust_capture_position != 0) {
 765                 capture_captured += adjust_capture_position;
 766                 adjust_capture_position = 0;
 767         }
 768
 769         uint32_t frames_read = g_atomic_int_get(&_frames_read_from_ringbuffer);
 770         uint32_t frames_written = g_atomic_int_get(&_frames_written_to_ringbuffer);
 771         if ((frames_written - frames_read) + nframes < midi_readahead) {
 772                 need_butler = true;
 773         }
 774
 775         /*cerr << "MDS written: " << frames_written << " - read: " << frames_read <<
 776                 " = " << frames_written - frames_read
 777                 << " + " << nframes << " < " << midi_readahead << " = " << need_butler << ")" << endl;*/
 778
 779         if (commit_should_unlock) {
 780                 state_lock.unlock();
 781         }
 782
 783         _processed = false;
 784
 785         return need_butler;
 786 }
 787
 788 void
 789 MidiDiskstream::set_pending_overwrite (bool yn)
 790 {
 791         /* called from audio thread, so we can use the read ptr and playback sample as we wish */
 792
 793         pending_overwrite = yn;
 794
 795         overwrite_frame = playback_sample;
 796 }
 797
 798 int
 799 MidiDiskstream::overwrite_existing_buffers ()
 800 {
 801         //read(overwrite_frame, disk_io_chunk_frames, false);
 802         overwrite_queued = false;
 803         pending_overwrite = false;
 804
 805         return 0;
 806 }
 807
 808 int
 809 MidiDiskstream::seek (nframes_t frame, bool complete_refill)
 810 {
 811         Glib::Mutex::Lock lm (state_lock);
 812         int ret = -1;
 813
 814         _playback_buf->reset();
 815         _capture_buf->reset();
 816         g_atomic_int_set(&_frames_read_from_ringbuffer, 0);
 817         g_atomic_int_set(&_frames_written_to_ringbuffer, 0);
 818
 819         playback_sample = frame;
 820         file_frame = frame;
 821
 822         if (complete_refill) {
 823                 while ((ret = do_refill_with_alloc ()) > 0) ;
 824         } else {
 825                 ret = do_refill_with_alloc ();
 826         }
 827
 828         return ret;
 829 }
 830
 831 int
 832 MidiDiskstream::can_internal_playback_seek (nframes_t distance)
 833 {
 834         uint32_t frames_read    = g_atomic_int_get(&_frames_read_from_ringbuffer);
 835         uint32_t frames_written = g_atomic_int_get(&_frames_written_to_ringbuffer);
 836         return ((frames_written - frames_read) < distance);
 837 }
 838
 839 int
 840 MidiDiskstream::internal_playback_seek (nframes_t distance)
 841 {
 842         first_recordable_frame += distance;
 843         playback_sample += distance;
 844
 845         return 0;
 846 }
 847
 848 /** @a start is set to the new frame position (TIME) read up to */
 849 int
 850 MidiDiskstream::read (nframes_t& start, nframes_t dur, bool reversed)
 851 {
 852         nframes_t this_read = 0;
 853         bool reloop = false;
 854         nframes_t loop_end = 0;
 855         nframes_t loop_start = 0;
 856         nframes_t loop_length = 0;
 857         Location *loc = 0;
 858
 859         if (!reversed) {
 860                 /* Make the use of a Location atomic for this read operation.
 861
 862                    Note: Locations don't get deleted, so all we care about
 863                    when I say "atomic" is that we are always pointing to
 864                    the same one and using a start/length values obtained
 865                    just once.
 866                 */
 867
 868                 if ((loc = loop_location) != 0) {
 869                         loop_start = loc->start();
 870                         loop_end = loc->end();
 871                         loop_length = loop_end - loop_start;
 872                 }
 873
 874                 /* if we are looping, ensure that the first frame we read is at the correct
 875                    position within the loop.
 876                 */
 877
 878                 if (loc && (start >= loop_end)) {
 879                         //cerr << "start adjusted from " << start;
 880                         start = loop_start + ((start - loop_start) % loop_length);
 881                         //cerr << "to " << start << endl;
 882                 }
 883                 //cerr << "start is " << start << "  loopstart: " << loop_start << "  loopend: " << loop_end << endl;
 884         }
 885
 886         while (dur) {
 887
 888                 /* take any loop into account. we can't read past the end of the loop. */
 889
 890                 if (loc && (loop_end - start < dur)) {
 891                         this_read = loop_end - start;
 892                         //cerr << "reloop true: thisread: " << this_read << "  dur: " << dur << endl;
 893                         reloop = true;
 894                 } else {
 895                         reloop = false;
 896                         this_read = dur;
 897                 }
 898
 899                 if (this_read == 0) {
 900                         break;
 901                 }
 902
 903                 this_read = min(dur,this_read);
 904
 905                 if (midi_playlist()->read (*_playback_buf, start, this_read) != this_read) {
 906                         error << string_compose(
 907                                         _("MidiDiskstream %1: cannot read %2 from playlist at frame %3"),
 908                                         _id, this_read, start) << endmsg;
 909                         return -1;
 910                 }
 911
 912                 g_atomic_int_add(&_frames_written_to_ringbuffer, this_read);
 913
 914                 _read_data_count = _playlist->read_data_count();
 915
 916                 if (reversed) {
 917
 918                         // Swap note ons with note offs here.  etc?
 919                         // Fully reversing MIDI requires look-ahead (well, behind) to find previous
 920                         // CC values etc.  hard.
 921
 922                 } else {
 923
 924                         /* if we read to the end of the loop, go back to the beginning */
 925
 926                         if (reloop) {
 927                                 // Synthesize LoopEvent here, because the next events
 928                                 // written will have non-monotonic timestamps.
 929                                 _playback_buf->write(loop_end - 1, LoopEventType, 0, 0);
 930                                 cout << "Pushing LoopEvent ts=" << loop_end-1
 931                                      << " start+this_read " << start+this_read << endl;
 932
 933                                 start = loop_start;
 934                         } else {
 935                                 start += this_read;
 936                         }
 937                 }
 938
 939                 dur -= this_read;
 940                 //offset += this_read;
 941         }
 942
 943         return 0;
 944 }
 945
 946 int
 947 MidiDiskstream::do_refill_with_alloc ()
 948 {
 949         return do_refill();
 950 }
 951
 952 int
 953 MidiDiskstream::do_refill ()
 954 {
 955         int     ret         = 0;
 956         size_t  write_space = _playback_buf->write_space();
 957         bool    reversed    = (_visible_speed * _session.transport_speed()) < 0.0f;
 958
 959         if (write_space == 0) {
 960                 return 0;
 961         }
 962
 963         if (reversed) {
 964                 return 0;
 965         }
 966
 967         /* at end: nothing to do */
 968         if (file_frame == max_frames) {
 969                 return 0;
 970         }
 971
 972         // At this point we...
 973         assert(_playback_buf->write_space() > 0); // ... have something to write to, and
 974         assert(file_frame <= max_frames); // ... something to write
 975
 976         // now calculate how much time is in the ringbuffer.
 977         // and lets write as much as we need to get this to be midi_readahead;
 978         uint32_t frames_read = g_atomic_int_get(&_frames_read_from_ringbuffer);
 979         uint32_t frames_written = g_atomic_int_get(&_frames_written_to_ringbuffer);
 980         if ((frames_written - frames_read) >= midi_readahead) {
 981                 //cout << "MDS Nothing to do. all fine" << endl;
 982                 return 0;
 983         }
 984
 985         nframes_t to_read = midi_readahead - (frames_written - frames_read);
 986
 987         //cout << "MDS read for midi_readahead " << to_read << "  rb_contains: "
 988         //      << frames_written - frames_read << endl;
 989
 990         to_read = min(to_read, (max_frames - file_frame));
 991
 992         if (read (file_frame, to_read, reversed)) {
 993                 ret = -1;
 994         }
 995
 996         return ret;
 997 }
 998
 999 /** Flush pending data to disk.
1000  *
1001  * Important note: this function will write *AT MOST* disk_io_chunk_frames
1002  * of data to disk. it will never write more than that.  If it writes that
1003  * much and there is more than that waiting to be written, it will return 1,
1004  * otherwise 0 on success or -1 on failure.
1005  *
1006  * If there is less than disk_io_chunk_frames to be written, no data will be
1007  * written at all unless @a force_flush is true.
1008  */
1009 int
1010 MidiDiskstream::do_flush (RunContext /*context*/, bool force_flush)
1011 {
1012         uint32_t to_write;
1013         int32_t ret = 0;
1014         nframes_t total;
1015
1016         _write_data_count = 0;
1017
1018         total = _session.transport_frame() - _last_flush_frame;
1019
1020         if (_last_flush_frame > _session.transport_frame()
1021                         || _last_flush_frame < capture_start_frame) {
1022                 _last_flush_frame = _session.transport_frame();
1023         }
1024
1025         if (total == 0 || _capture_buf->read_space() == 0
1026                         || (!force_flush && (total < disk_io_chunk_frames && was_recording))) {
1027                 goto out;
1028         }
1029
1030         /* if there are 2+ chunks of disk i/o possible for
1031            this track, let the caller know so that it can arrange
1032            for us to be called again, ASAP.
1033
1034            if we are forcing a flush, then if there is* any* extra
1035            work, let the caller know.
1036
1037            if we are no longer recording and there is any extra work,
1038            let the caller know too.
1039            */
1040
1041         if (total >= 2 * disk_io_chunk_frames || ((force_flush || !was_recording) && total > disk_io_chunk_frames)) {
1042                 ret = 1;
1043         }
1044
1045         to_write = disk_io_chunk_frames;
1046
1047         assert(!destructive());
1048
1049         if (record_enabled()
1050                         && (   (_session.transport_frame() - _last_flush_frame > disk_io_chunk_frames)
1051                                 || force_flush)) {
1052                 if ((!_write_source) || _write_source->midi_write (*_capture_buf, capture_start_frame, to_write) != to_write) {
1053                         error << string_compose(_("MidiDiskstream %1: cannot write to disk"), _id) << endmsg;
1054                         return -1;
1055                 } else {
1056                         _last_flush_frame = _session.transport_frame();
1057                 }
1058         }
1059
1060 out:
1061         return ret;
1062 }
1063
1064 void
1065 MidiDiskstream::transport_stopped (struct tm& /*when*/, time_t /*twhen*/, bool abort_capture)
1066 {
1067         uint32_t buffer_position;
1068         bool more_work = true;
1069         int err = 0;
1070         boost::shared_ptr<MidiRegion> region;
1071         nframes_t total_capture;
1072         MidiRegion::SourceList srcs;
1073         MidiRegion::SourceList::iterator src;
1074         vector<CaptureInfo*>::iterator ci;
1075         bool mark_write_completed = false;
1076
1077         finish_capture (true);
1078
1079         /* butler is already stopped, but there may be work to do
1080            to flush remaining data to disk.
1081            */
1082
1083         while (more_work && !err) {
1084                 switch (do_flush (TransportContext, true)) {
1085                         case 0:
1086                                 more_work = false;
1087                                 break;
1088                         case 1:
1089                                 break;
1090                         case -1:
1091                                 error << string_compose(_("MidiDiskstream \"%1\": cannot flush captured data to disk!"), _name) << endmsg;
1092                                 err++;
1093                 }
1094         }
1095
1096         /* XXX is there anything we can do if err != 0 ? */
1097         Glib::Mutex::Lock lm (capture_info_lock);
1098
1099         if (capture_info.empty()) {
1100                 return;
1101         }
1102
1103         if (abort_capture) {
1104
1105                 if (_write_source) {
1106
1107                         _write_source->mark_for_remove ();
1108                         _write_source->drop_references ();
1109                         _write_source.reset();
1110                 }
1111
1112                 /* new source set up in "out" below */
1113
1114         } else {
1115
1116                 assert(_write_source);
1117
1118                 for (total_capture = 0, ci = capture_info.begin(); ci != capture_info.end(); ++ci) {
1119                         total_capture += (*ci)->frames;
1120                 }
1121
1122                 /* figure out the name for this take */
1123
1124                 srcs.push_back (_write_source);
1125                 _write_source->set_timeline_position (capture_info.front()->start);
1126                 _write_source->set_captured_for (_name);
1127
1128                 string whole_file_region_name;
1129                 whole_file_region_name = region_name_from_path (_write_source->name(), true);
1130
1131                 /* Register a new region with the Session that
1132                    describes the entire source. Do this first
1133                    so that any sub-regions will obviously be
1134                    children of this one (later!)
1135                    */
1136
1137                 try {
1138                         boost::shared_ptr<Region> rx (RegionFactory::create (srcs, 0,
1139                                         total_capture, whole_file_region_name, 0,
1140                                         Region::Flag (Region::DefaultFlags|Region::Automatic|Region::WholeFile)));
1141
1142                         region = boost::dynamic_pointer_cast<MidiRegion> (rx);
1143                         region->special_set_position (capture_info.front()->start);
1144                 }
1145
1146
1147                 catch (failed_constructor& err) {
1148                         error << string_compose(_("%1: could not create region for complete midi file"), _name) << endmsg;
1149                         /* XXX what now? */
1150                 }
1151
1152                 _last_capture_regions.push_back (region);
1153
1154                 // cerr << _name << ": there are " << capture_info.size() << " capture_info records\n";
1155
1156                 XMLNode &before = _playlist->get_state();
1157                 _playlist->freeze ();
1158
1159                 for (buffer_position = 0, ci = capture_info.begin(); ci != capture_info.end(); ++ci) {
1160
1161                         string region_name;
1162
1163                         _session.region_name (region_name, _write_source->name(), false);
1164
1165                         // cerr << _name << ": based on ci of " << (*ci)->start << " for " << (*ci)->frames << " add a region\n";
1166
1167                         try {
1168                                 boost::shared_ptr<Region> rx (RegionFactory::create (srcs, buffer_position, (*ci)->frames, region_name));
1169                                 region = boost::dynamic_pointer_cast<MidiRegion> (rx);
1170                         }
1171
1172                         catch (failed_constructor& err) {
1173                                 error << _("MidiDiskstream: could not create region for captured midi!") << endmsg;
1174                                 continue; /* XXX is this OK? */
1175                         }
1176
1177                         region->GoingAway.connect (bind (mem_fun (*this, &Diskstream::remove_region_from_last_capture), boost::weak_ptr<Region>(region)));
1178
1179                         _last_capture_regions.push_back (region);
1180
1181                         // cerr << "add new region, buffer position = " << buffer_position << " @ " << (*ci)->start << endl;
1182
1183                         i_am_the_modifier++;
1184                         _playlist->add_region (region, (*ci)->start);
1185                         i_am_the_modifier--;
1186
1187                         buffer_position += (*ci)->frames;
1188                 }
1189
1190                 _playlist->thaw ();
1191                 XMLNode &after = _playlist->get_state();
1192                 _session.add_command (new MementoCommand<Playlist>(*_playlist, &before, &after));
1193
1194         }
1195
1196         mark_write_completed = true;
1197
1198         reset_write_sources (mark_write_completed);
1199
1200         for (ci = capture_info.begin(); ci != capture_info.end(); ++ci) {
1201                 delete *ci;
1202         }
1203
1204         capture_info.clear ();
1205         capture_start_frame = 0;
1206 }
1207
1208 void
1209 MidiDiskstream::transport_looped (nframes_t transport_frame)
1210 {
1211         if (was_recording) {
1212
1213                 // adjust the capture length knowing that the data will be recorded to disk
1214                 // only necessary after the first loop where we're recording
1215                 if (capture_info.size() == 0) {
1216                         capture_captured += _capture_offset;
1217
1218                         if (_alignment_style == ExistingMaterial) {
1219                                 capture_captured += _session.worst_output_latency();
1220                         } else {
1221                                 capture_captured += _roll_delay;
1222                         }
1223                 }
1224
1225                 finish_capture (true);
1226
1227                 // the next region will start recording via the normal mechanism
1228                 // we'll set the start position to the current transport pos
1229                 // no latency adjustment or capture offset needs to be made, as that already happened the first time
1230                 capture_start_frame = transport_frame;
1231                 first_recordable_frame = transport_frame; // mild lie
1232                 last_recordable_frame = max_frames;
1233                 was_recording = true;
1234         }
1235 }
1236
1237 void
1238 MidiDiskstream::finish_capture (bool /*rec_monitors_input*/)
1239 {
1240         was_recording = false;
1241
1242         if (capture_captured == 0) {
1243                 return;
1244         }
1245
1246         // Why must we destroy?
1247         assert(!destructive());
1248
1249         CaptureInfo* ci = new CaptureInfo;
1250
1251         ci->start  = capture_start_frame;
1252         ci->frames = capture_captured;
1253
1254         /* XXX theoretical race condition here. Need atomic exchange ?
1255            However, the circumstances when this is called right
1256            now (either on record-disable or transport_stopped)
1257            mean that no actual race exists. I think ...
1258            We now have a capture_info_lock, but it is only to be used
1259            to synchronize in the transport_stop and the capture info
1260            accessors, so that invalidation will not occur (both non-realtime).
1261         */
1262
1263         // cerr << "Finish capture, add new CI, " << ci->start << '+' << ci->frames << endl;
1264
1265         capture_info.push_back (ci);
1266         capture_captured = 0;
1267 }
1268
1269 void
1270 MidiDiskstream::set_record_enabled (bool yn)
1271 {
1272         if (!recordable() || !_session.record_enabling_legal()) {
1273                 return;
1274         }
1275
1276         assert(!destructive());
1277
1278         if (yn && _source_port == 0) {
1279
1280                 /* pick up connections not initiated *from* the IO object
1281                    we're associated with.
1282                 */
1283
1284                 get_input_sources ();
1285         }
1286
1287         /* yes, i know that this not proof against race conditions, but its
1288            good enough. i think.
1289         */
1290
1291         if (record_enabled() != yn) {
1292                 if (yn) {
1293                         engage_record_enable ();
1294                 } else {
1295                         disengage_record_enable ();
1296                 }
1297         }
1298 }
1299
1300 void
1301 MidiDiskstream::engage_record_enable ()
1302 {
1303     bool rolling = _session.transport_speed() != 0.0f;
1304
1305         g_atomic_int_set (&_record_enabled, 1);
1306
1307         if (_source_port && Config->get_monitoring_model() == HardwareMonitoring) {
1308                 _source_port->request_monitor_input (!(_session.config.get_auto_input() && rolling));
1309         }
1310
1311         // FIXME: Why is this necessary?  Isn't needed for AudioDiskstream...
1312         if (!_write_source)
1313                 use_new_write_source();
1314
1315         _write_source->mark_streaming_midi_write_started (_note_mode, _session.transport_frame());
1316
1317         RecordEnableChanged (); /* EMIT SIGNAL */
1318 }
1319
1320 void
1321 MidiDiskstream::disengage_record_enable ()
1322 {
1323         g_atomic_int_set (&_record_enabled, 0);
1324         if (_source_port && Config->get_monitoring_model() == HardwareMonitoring) {
1325                 if (_source_port) {
1326                         _source_port->request_monitor_input (false);
1327                 }
1328         }
1329
1330         RecordEnableChanged (); /* EMIT SIGNAL */
1331 }
1332
1333 XMLNode&
1334 MidiDiskstream::get_state ()
1335 {
1336         XMLNode* node = new XMLNode ("MidiDiskstream");
1337         char buf[64];
1338         LocaleGuard lg (X_("POSIX"));
1339
1340         snprintf (buf, sizeof(buf), "0x%x", _flags);
1341         node->add_property ("flags", buf);
1342
1343         node->add_property("channel-mode", enum_2_string(get_channel_mode()));
1344
1345         snprintf (buf, sizeof(buf), "0x%x", get_channel_mask());
1346         node->add_property("channel-mask", buf);
1347
1348         node->add_property ("playlist", _playlist->name());
1349
1350         snprintf (buf, sizeof(buf), "%f", _visible_speed);
1351         node->add_property ("speed", buf);
1352
1353         node->add_property("name", _name);
1354         id().print(buf, sizeof(buf));
1355         node->add_property("id", buf);
1356
1357         if (_write_source && _session.get_record_enabled()) {
1358
1359                 XMLNode* cs_child = new XMLNode (X_("CapturingSources"));
1360                 XMLNode* cs_grandchild;
1361
1362                 cs_grandchild = new XMLNode (X_("file"));
1363                 cs_grandchild->add_property (X_("path"), _write_source->path());
1364                 cs_child->add_child_nocopy (*cs_grandchild);
1365
1366                 /* store the location where capture will start */
1367
1368                 Location* pi;
1369
1370                 if (_session.config.get_punch_in() && ((pi = _session.locations()->auto_punch_location()) != 0)) {
1371                         snprintf (buf, sizeof (buf), "%" PRId64, pi->start());
1372                 } else {
1373                         snprintf (buf, sizeof (buf), "%" PRIu32, _session.transport_frame());
1374                 }
1375
1376                 cs_child->add_property (X_("at"), buf);
1377                 node->add_child_nocopy (*cs_child);
1378         }
1379
1380         if (_extra_xml) {
1381                 node->add_child_copy (*_extra_xml);
1382         }
1383
1384         return* node;
1385 }
1386
1387 int
1388 MidiDiskstream::set_state (const XMLNode& node)
1389 {
1390         const XMLProperty* prop;
1391         XMLNodeList nlist = node.children();
1392         XMLNodeIterator niter;
1393         uint32_t nchans = 1;
1394         XMLNode* capture_pending_node = 0;
1395         LocaleGuard lg (X_("POSIX"));
1396
1397         in_set_state = true;
1398
1399         for (niter = nlist.begin(); niter != nlist.end(); ++niter) {
1400                 /*if ((*niter)->name() == IO::state_node_name) {
1401                         deprecated_io_node = new XMLNode (**niter);
1402                 }*/
1403                 assert ((*niter)->name() != IO::state_node_name);
1404
1405                 if ((*niter)->name() == X_("CapturingSources")) {
1406                         capture_pending_node = *niter;
1407                 }
1408         }
1409
1410         /* prevent write sources from being created */
1411
1412         in_set_state = true;
1413
1414         if ((prop = node.property ("name")) != 0) {
1415                 _name = prop->value();
1416         }
1417
1418         if ((prop = node.property ("id")) != 0) {
1419                 _id = prop->value ();
1420         }
1421
1422         if ((prop = node.property ("flags")) != 0) {
1423                 _flags = Flag (string_2_enum (prop->value(), _flags));
1424         }
1425
1426         ChannelMode channel_mode = AllChannels;
1427         if ((prop = node.property ("channel-mode")) != 0) {
1428                 channel_mode = ChannelMode (string_2_enum(prop->value(), channel_mode));
1429         }
1430
1431         unsigned int channel_mask = 0xFFFF;
1432         if ((prop = node.property ("channel-mask")) != 0) {
1433                 sscanf (prop->value().c_str(), "0x%x", &channel_mask);
1434                 if (channel_mask & (~0xFFFF)) {
1435                         warning << _("MidiDiskstream: XML property channel-mask out of range") << endmsg;
1436                 }
1437         }
1438
1439         set_channel_mode(channel_mode, channel_mask);
1440
1441         if ((prop = node.property ("channels")) != 0) {
1442                 nchans = atoi (prop->value().c_str());
1443         }
1444
1445         if ((prop = node.property ("playlist")) == 0) {
1446                 return -1;
1447         }
1448
1449         {
1450                 bool had_playlist = (_playlist != 0);
1451
1452                 if (find_and_use_playlist (prop->value())) {
1453                         return -1;
1454                 }
1455
1456                 if (!had_playlist) {
1457                         _playlist->set_orig_diskstream_id (_id);
1458                 }
1459
1460                 if (capture_pending_node) {
1461                         use_pending_capture_data (*capture_pending_node);
1462                 }
1463
1464         }
1465
1466         if ((prop = node.property ("speed")) != 0) {
1467                 double sp = atof (prop->value().c_str());
1468
1469                 if (realtime_set_speed (sp, false)) {
1470                         non_realtime_set_speed ();
1471                 }
1472         }
1473
1474         in_set_state = false;
1475
1476         /* make sure this is clear before we do anything else */
1477
1478         // FIXME?
1479         //_capturing_source = 0;
1480
1481         /* write sources are handled when we handle the input set
1482            up of the IO that owns this DS (::non_realtime_input_change())
1483         */
1484
1485         in_set_state = false;
1486
1487         return 0;
1488 }
1489
1490 int
1491 MidiDiskstream::use_new_write_source (uint32_t n)
1492 {
1493         if (!recordable()) {
1494                 return 1;
1495         }
1496
1497         assert(n == 0);
1498
1499         if (_write_source) {
1500
1501                 if (_write_source->is_empty ()) {
1502                         _write_source->mark_for_remove ();
1503                         _write_source.reset();
1504                 } else {
1505                         _write_source.reset();
1506                 }
1507         }
1508
1509         try {
1510                 _write_source = boost::dynamic_pointer_cast<SMFSource>(_session.create_midi_source_for_session (*this));
1511                 if (!_write_source) {
1512                         throw failed_constructor();
1513                 }
1514         }
1515
1516         catch (failed_constructor &err) {
1517                 error << string_compose (_("%1:%2 new capture file not initialized correctly"), _name, n) << endmsg;
1518                 _write_source.reset();
1519                 return -1;
1520         }
1521
1522         _write_source->set_allow_remove_if_empty (true);
1523
1524         return 0;
1525 }
1526
1527 void
1528 MidiDiskstream::reset_write_sources (bool mark_write_complete, bool /*force*/)
1529 {
1530         if (!recordable()) {
1531                 return;
1532         }
1533
1534         if (_write_source && mark_write_complete) {
1535                 _write_source->mark_streaming_write_completed ();
1536         }
1537
1538         use_new_write_source (0);
1539
1540         if (record_enabled()) {
1541                 //_capturing_sources.push_back (_write_source);
1542         }
1543 }
1544
1545 int
1546 MidiDiskstream::rename_write_sources ()
1547 {
1548         if (_write_source != 0) {
1549                 _write_source->set_source_name (_name, destructive());
1550                 /* XXX what to do if this fails ? */
1551         }
1552         return 0;
1553 }
1554
1555 void
1556 MidiDiskstream::set_block_size (nframes_t /*nframes*/)
1557 {
1558 }
1559
1560 void
1561 MidiDiskstream::allocate_temporary_buffers ()
1562 {
1563 }
1564
1565 void
1566 MidiDiskstream::monitor_input (bool yn)
1567 {
1568         if (_source_port)
1569                 _source_port->ensure_monitor_input (yn);
1570 }
1571
1572 void
1573 MidiDiskstream::set_align_style_from_io ()
1574 {
1575         bool have_physical = false;
1576
1577         if (_io == 0) {
1578                 return;
1579         }
1580
1581         get_input_sources ();
1582
1583         if (_source_port && _source_port->flags() & JackPortIsPhysical) {
1584                 have_physical = true;
1585         }
1586
1587         if (have_physical) {
1588                 set_align_style (ExistingMaterial);
1589         } else {
1590                 set_align_style (CaptureTime);
1591         }
1592 }
1593
1594
1595 float
1596 MidiDiskstream::playback_buffer_load () const
1597 {
1598         return (float) ((double) _playback_buf->read_space()/
1599                         (double) _playback_buf->capacity());
1600 }
1601
1602 float
1603 MidiDiskstream::capture_buffer_load () const
1604 {
1605         return (float) ((double) _capture_buf->write_space()/
1606                         (double) _capture_buf->capacity());
1607 }
1608
1609 int
1610 MidiDiskstream::use_pending_capture_data (XMLNode& /*node*/)
1611 {
1612         return 0;
1613 }
1614
1615 /** Writes playback events in the given range to \a dst, translating time stamps
1616  * so that an event at \a start has time = 0
1617  */
1618 void
1619 MidiDiskstream::get_playback (MidiBuffer& dst, nframes_t start, nframes_t end)
1620 {
1621         dst.clear();
1622         assert(dst.size() == 0);
1623
1624         // Reverse.  ... We just don't do reverse, ok?  Back off.
1625         if (end <= start) {
1626                 return;
1627         }
1628
1629         // Translates stamps to be relative to start
1630
1631         _playback_buf->read(dst, start, end);
1632
1633 #if 0
1634         const size_t events_read = _playback_buf->read(dst, start, end);
1635         cout << _name << ": MDS events read = " << events_read
1636              << " start = " << start << " end = " << end
1637              << " readspace " << _playback_buf->read_space()
1638              << " writespace " << _playback_buf->write_space() << endl;
1639 #endif
1640
1641         gint32 frames_read = end - start;
1642         g_atomic_int_add(&_frames_read_from_ringbuffer, frames_read);
1643 }
1644