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         bool      collect_playback = true;
 603
 604         /* if we've already processed the frames corresponding to this call,
 605            just return. this allows multiple routes that are taking input
 606            from this diskstream to call our ::process() method, but have
 607            this stuff only happen once. more commonly, it allows both
 608            the AudioTrack that is using this AudioDiskstream *and* the Session
 609            to call process() without problems.
 610            */
 611
 612         if (_processed) {
 613                 return 0;
 614         }
 615
 616         commit_should_unlock = false;
 617
 618         check_record_status (transport_frame, nframes, can_record);
 619
 620         nominally_recording = (can_record && re);
 621
 622         if (nframes == 0) {
 623                 _processed = true;
 624                 return 0;
 625         }
 626
 627         /* This lock is held until the end of ::commit, so these two functions
 628            must always be called as a pair. The only exception is if this function
 629            returns a non-zero value, in which case, ::commit should not be called.
 630            */
 631
 632         // If we can't take the state lock return.
 633         if (!state_lock.trylock()) {
 634                 return 1;
 635         }
 636         commit_should_unlock = true;
 637         adjust_capture_position = 0;
 638
 639         if (nominally_recording || (_session.get_record_enabled() && _session.config.get_punch_in())) {
 640                 OverlapType ot;
 641
 642                 ot = coverage (first_recordable_frame, last_recordable_frame, transport_frame, transport_frame + nframes);
 643
 644                 switch (ot) {
 645                         case OverlapNone:
 646                                 rec_nframes = 0;
 647                                 break;
 648
 649                         case OverlapInternal:
 650                                 /*     ----------    recrange
 651                                            |---|       transrange
 652                                            */
 653                                 rec_nframes = nframes;
 654                                 rec_offset = 0;
 655                                 break;
 656
 657                         case OverlapStart:
 658                                 /*    |--------|    recrange
 659                                           -----|          transrange
 660                                           */
 661                                 rec_nframes = transport_frame + nframes - first_recordable_frame;
 662                                 if (rec_nframes) {
 663                                         rec_offset = first_recordable_frame - transport_frame;
 664                                 }
 665                                 break;
 666
 667                         case OverlapEnd:
 668                                 /*    |--------|    recrange
 669                                           |--------  transrange
 670                                           */
 671                                 rec_nframes = last_recordable_frame - transport_frame;
 672                                 rec_offset = 0;
 673                                 break;
 674
 675                         case OverlapExternal:
 676                                 /*    |--------|    recrange
 677                                           --------------  transrange
 678                                           */
 679                                 rec_nframes = last_recordable_frame - last_recordable_frame;
 680                                 rec_offset = first_recordable_frame - transport_frame;
 681                                 break;
 682                 }
 683
 684                 if (rec_nframes && !was_recording) {
 685                         capture_captured = 0;
 686                         was_recording = true;
 687                 }
 688         }
 689
 690
 691         if (can_record && !_last_capture_regions.empty()) {
 692                 _last_capture_regions.clear ();
 693         }
 694
 695         if (nominally_recording || rec_nframes) {
 696
 697                 // Pump entire port buffer into the ring buffer (FIXME: split cycles?)
 698                 MidiBuffer& buf = _source_port->get_midi_buffer(nframes);
 699                 for (MidiBuffer::iterator i = buf.begin(); i != buf.end(); ++i) {
 700                         const Evoral::MIDIEvent<MidiBuffer::TimeType> ev(*i, false);
 701                         assert(ev.buffer());
 702                         _capture_buf->write(ev.time() + transport_frame, ev.type(), ev.size(), ev.buffer());
 703                 }
 704
 705         } else {
 706
 707                 if (was_recording) {
 708                         finish_capture (rec_monitors_input);
 709                 }
 710
 711         }
 712
 713         if (rec_nframes) {
 714
 715                 /* data will be written to disk */
 716
 717                 if (rec_nframes == nframes && rec_offset == 0) {
 718                         playback_distance = nframes;
 719                 }
 720
 721                 adjust_capture_position = rec_nframes;
 722
 723         } else if (nominally_recording) {
 724
 725                 /* can't do actual capture yet - waiting for latency effects to finish before we start*/
 726
 727                 playback_distance = nframes;
 728                 collect_playback = false;
 729
 730         }
 731
 732         if (collect_playback) {
 733
 734                 /* we're doing playback */
 735
 736                 nframes_t necessary_samples;
 737
 738                 /* no varispeed playback if we're recording, because the output .... TBD */
 739
 740                 if (rec_nframes == 0 && _actual_speed != 1.0f) {
 741                         necessary_samples = (nframes_t) floor ((nframes * fabs (_actual_speed))) + 1;
 742                 } else {
 743                         necessary_samples = nframes;
 744                 }
 745
 746                 // Pump entire port buffer into playback buffer (FIXME: split cycles?)
 747                 MidiBuffer& buf = _source_port->get_midi_buffer(nframes);
 748                 for (MidiBuffer::iterator i = buf.begin(); i != buf.end(); ++i) {
 749                         const Evoral::MIDIEvent<MidiBuffer::TimeType> ev(*i, false);
 750                         assert(ev.buffer());
 751                         _playback_buf->write(ev.time() + transport_frame, ev.type(), ev.size(), ev.buffer());
 752                 }
 753         }
 754
 755         ret = 0;
 756
 757         _processed = true;
 758
 759         if (ret) {
 760
 761                 /* we're exiting with failure, so ::commit will not
 762                    be called. unlock the state lock.
 763                    */
 764
 765                 commit_should_unlock = false;
 766                 state_lock.unlock();
 767         }
 768
 769         return ret;
 770 }
 771
 772 bool
 773 MidiDiskstream::commit (nframes_t nframes)
 774 {
 775         bool need_butler = false;
 776
 777         if (_actual_speed < 0.0) {
 778                 playback_sample -= playback_distance;
 779         } else {
 780                 playback_sample += playback_distance;
 781         }
 782
 783         if (adjust_capture_position != 0) {
 784                 capture_captured += adjust_capture_position;
 785                 adjust_capture_position = 0;
 786         }
 787
 788         uint32_t frames_read = g_atomic_int_get(&_frames_read_from_ringbuffer);
 789         uint32_t frames_written = g_atomic_int_get(&_frames_written_to_ringbuffer);
 790         if ((frames_written - frames_read) + nframes < midi_readahead) {
 791                 need_butler = true;
 792         }
 793
 794         /*cerr << "MDS written: " << frames_written << " - read: " << frames_read <<
 795                 " = " << frames_written - frames_read
 796                 << " + " << nframes << " < " << midi_readahead << " = " << need_butler << ")" << endl;*/
 797
 798         if (commit_should_unlock) {
 799                 state_lock.unlock();
 800         }
 801
 802         _processed = false;
 803
 804         return need_butler;
 805 }
 806
 807 void
 808 MidiDiskstream::set_pending_overwrite (bool yn)
 809 {
 810         /* called from audio thread, so we can use the read ptr and playback sample as we wish */
 811
 812         pending_overwrite = yn;
 813
 814         overwrite_frame = playback_sample;
 815 }
 816
 817 int
 818 MidiDiskstream::overwrite_existing_buffers ()
 819 {
 820         //read(overwrite_frame, disk_io_chunk_frames, false);
 821         overwrite_queued = false;
 822         pending_overwrite = false;
 823
 824         return 0;
 825 }
 826
 827 int
 828 MidiDiskstream::seek (nframes_t frame, bool complete_refill)
 829 {
 830         Glib::Mutex::Lock lm (state_lock);
 831         int ret = -1;
 832
 833         _playback_buf->reset();
 834         _capture_buf->reset();
 835         g_atomic_int_set(&_frames_read_from_ringbuffer, 0);
 836         g_atomic_int_set(&_frames_written_to_ringbuffer, 0);
 837
 838         playback_sample = frame;
 839         file_frame = frame;
 840
 841         if (complete_refill) {
 842                 while ((ret = do_refill_with_alloc ()) > 0) ;
 843         } else {
 844                 ret = do_refill_with_alloc ();
 845         }
 846
 847         return ret;
 848 }
 849
 850 int
 851 MidiDiskstream::can_internal_playback_seek (nframes_t distance)
 852 {
 853         uint32_t frames_read    = g_atomic_int_get(&_frames_read_from_ringbuffer);
 854         uint32_t frames_written = g_atomic_int_get(&_frames_written_to_ringbuffer);
 855         return ((frames_written - frames_read) < distance);
 856 }
 857
 858 int
 859 MidiDiskstream::internal_playback_seek (nframes_t distance)
 860 {
 861         cerr << "MDS: internal_playback_seek " << distance << endl;
 862
 863         first_recordable_frame += distance;
 864         playback_sample += distance;
 865
 866         return 0;
 867 }
 868
 869 /** @a start is set to the new frame position (TIME) read up to */
 870 int
 871 MidiDiskstream::read (nframes_t& start, nframes_t dur, bool reversed)
 872 {
 873         nframes_t this_read = 0;
 874         bool reloop = false;
 875         nframes_t loop_end = 0;
 876         nframes_t loop_start = 0;
 877         nframes_t loop_length = 0;
 878         Location *loc = 0;
 879
 880         if (!reversed) {
 881                 /* Make the use of a Location atomic for this read operation.
 882
 883                    Note: Locations don't get deleted, so all we care about
 884                    when I say "atomic" is that we are always pointing to
 885                    the same one and using a start/length values obtained
 886                    just once.
 887                 */
 888
 889                 if ((loc = loop_location) != 0) {
 890                         loop_start = loc->start();
 891                         loop_end = loc->end();
 892                         loop_length = loop_end - loop_start;
 893                 }
 894
 895                 /* if we are looping, ensure that the first frame we read is at the correct
 896                    position within the loop.
 897                 */
 898
 899                 if (loc && (start >= loop_end)) {
 900                         //cerr << "start adjusted from " << start;
 901                         start = loop_start + ((start - loop_start) % loop_length);
 902                         //cerr << "to " << start << endl;
 903                 }
 904                 //cerr << "start is " << start << "  loopstart: " << loop_start << "  loopend: " << loop_end << endl;
 905         }
 906
 907         while (dur) {
 908
 909                 /* take any loop into account. we can't read past the end of the loop. */
 910
 911                 if (loc && (loop_end - start < dur)) {
 912                         this_read = loop_end - start;
 913                         //cerr << "reloop true: thisread: " << this_read << "  dur: " << dur << endl;
 914                         reloop = true;
 915                 } else {
 916                         reloop = false;
 917                         this_read = dur;
 918                 }
 919
 920                 if (this_read == 0) {
 921                         break;
 922                 }
 923
 924                 this_read = min(dur,this_read);
 925
 926                 if (midi_playlist()->read (*_playback_buf, start, this_read) != this_read) {
 927                         error << string_compose(
 928                                         _("MidiDiskstream %1: cannot read %2 from playlist at frame %3"),
 929                                         _id, this_read, start) << endmsg;
 930                         return -1;
 931                 }
 932
 933                 //cout << "MDS this read " << this_read << " start = " << start << endl;
 934                 g_atomic_int_add(&_frames_written_to_ringbuffer, this_read);
 935
 936                 _read_data_count = _playlist->read_data_count();
 937
 938                 if (reversed) {
 939
 940                         // Swap note ons with note offs here.  etc?
 941                         // Fully reversing MIDI requires look-ahead (well, behind) to find previous
 942                         // CC values etc.  hard.
 943
 944                 } else {
 945
 946                         /* if we read to the end of the loop, go back to the beginning */
 947
 948                         if (reloop) {
 949                                 // Synthesize LoopEvent here, because the next events
 950                                 // written will have non-monotonic timestamps.
 951                                 _playback_buf->write(loop_end - 1, LoopEventType, 0, 0);
 952                                 //cout << "Pushing LoopEvent ts=" << loop_end-1
 953                                 //     << " start+this_read " << start+this_read << endl;
 954
 955                                 start = loop_start;
 956                         } else {
 957                                 start += this_read;
 958                         }
 959                 }
 960
 961                 dur -= this_read;
 962                 //offset += this_read;
 963         }
 964
 965         return 0;
 966 }
 967
 968 int
 969 MidiDiskstream::do_refill_with_alloc ()
 970 {
 971         return do_refill();
 972 }
 973
 974 int
 975 MidiDiskstream::do_refill ()
 976 {
 977         int     ret         = 0;
 978         size_t  write_space = _playback_buf->write_space();
 979         bool    reversed    = (_visible_speed * _session.transport_speed()) < 0.0f;
 980
 981         if (write_space == 0) {
 982                 return 0;
 983         }
 984
 985         if (reversed) {
 986                 return 0;
 987         }
 988
 989         /* at end: nothing to do */
 990         if (file_frame == max_frames) {
 991                 return 0;
 992         }
 993
 994         // At this point we...
 995         assert(_playback_buf->write_space() > 0); // ... have something to write to, and
 996         assert(file_frame <= max_frames); // ... something to write
 997
 998         // now calculate how much time is in the ringbuffer.
 999         // and lets write as much as we need to get this to be midi_readahead;
1000         uint32_t frames_read = g_atomic_int_get(&_frames_read_from_ringbuffer);
1001         uint32_t frames_written = g_atomic_int_get(&_frames_written_to_ringbuffer);
1002         if ((frames_written - frames_read) >= midi_readahead) {
1003                 //cout << "MDS Nothing to do. all fine" << endl;
1004                 return 0;
1005         }
1006
1007         nframes_t to_read = midi_readahead - (frames_written - frames_read);
1008
1009         //cout << "MDS read for midi_readahead " << to_read << "  rb_contains: "
1010         //      << frames_written - frames_read << endl;
1011
1012         to_read = min(to_read, (max_frames - file_frame));
1013
1014         if (read (file_frame, to_read, reversed)) {
1015                 ret = -1;
1016         }
1017
1018         return ret;
1019 }
1020
1021 /** Flush pending data to disk.
1022  *
1023  * Important note: this function will write *AT MOST* disk_io_chunk_frames
1024  * of data to disk. it will never write more than that.  If it writes that
1025  * much and there is more than that waiting to be written, it will return 1,
1026  * otherwise 0 on success or -1 on failure.
1027  *
1028  * If there is less than disk_io_chunk_frames to be written, no data will be
1029  * written at all unless @a force_flush is true.
1030  */
1031 int
1032 MidiDiskstream::do_flush (RunContext /*context*/, bool force_flush)
1033 {
1034         uint32_t to_write;
1035         int32_t ret = 0;
1036         nframes_t total;
1037
1038         _write_data_count = 0;
1039
1040         total = _session.transport_frame() - _last_flush_frame;
1041
1042         if (_last_flush_frame > _session.transport_frame()
1043                         || _last_flush_frame < capture_start_frame) {
1044                 _last_flush_frame = _session.transport_frame();
1045         }
1046
1047         if (total == 0 || _capture_buf->read_space() == 0
1048                         || (!force_flush && (total < disk_io_chunk_frames && was_recording))) {
1049                 goto out;
1050         }
1051
1052         /* if there are 2+ chunks of disk i/o possible for
1053            this track, let the caller know so that it can arrange
1054            for us to be called again, ASAP.
1055
1056            if we are forcing a flush, then if there is* any* extra
1057            work, let the caller know.
1058
1059            if we are no longer recording and there is any extra work,
1060            let the caller know too.
1061            */
1062
1063         if (total >= 2 * disk_io_chunk_frames || ((force_flush || !was_recording) && total > disk_io_chunk_frames)) {
1064                 ret = 1;
1065         }
1066
1067         to_write = disk_io_chunk_frames;
1068
1069         assert(!destructive());
1070
1071         if (record_enabled()
1072                         && (   (_session.transport_frame() - _last_flush_frame > disk_io_chunk_frames)
1073                                 || force_flush)) {
1074                 if ((!_write_source) || _write_source->midi_write (*_capture_buf, capture_start_frame, to_write) != to_write) {
1075                         error << string_compose(_("MidiDiskstream %1: cannot write to disk"), _id) << endmsg;
1076                         return -1;
1077                 } else {
1078                         _last_flush_frame = _session.transport_frame();
1079                 }
1080         }
1081
1082 out:
1083         return ret;
1084 }
1085
1086 void
1087 MidiDiskstream::transport_stopped (struct tm& /*when*/, time_t /*twhen*/, bool abort_capture)
1088 {
1089         uint32_t buffer_position;
1090         bool more_work = true;
1091         int err = 0;
1092         boost::shared_ptr<MidiRegion> region;
1093         nframes_t total_capture;
1094         MidiRegion::SourceList srcs;
1095         MidiRegion::SourceList::iterator src;
1096         vector<CaptureInfo*>::iterator ci;
1097         bool mark_write_completed = false;
1098
1099         finish_capture (true);
1100
1101         /* butler is already stopped, but there may be work to do
1102            to flush remaining data to disk.
1103            */
1104
1105         while (more_work && !err) {
1106                 switch (do_flush (TransportContext, true)) {
1107                         case 0:
1108                                 more_work = false;
1109                                 break;
1110                         case 1:
1111                                 break;
1112                         case -1:
1113                                 error << string_compose(_("MidiDiskstream \"%1\": cannot flush captured data to disk!"), _name) << endmsg;
1114                                 err++;
1115                 }
1116         }
1117
1118         /* XXX is there anything we can do if err != 0 ? */
1119         Glib::Mutex::Lock lm (capture_info_lock);
1120
1121         if (capture_info.empty()) {
1122                 return;
1123         }
1124
1125         if (abort_capture) {
1126
1127                 if (_write_source) {
1128
1129                         _write_source->mark_for_remove ();
1130                         _write_source->drop_references ();
1131                         _write_source.reset();
1132                 }
1133
1134                 /* new source set up in "out" below */
1135
1136         } else {
1137
1138                 assert(_write_source);
1139
1140                 for (total_capture = 0, ci = capture_info.begin(); ci != capture_info.end(); ++ci) {
1141                         total_capture += (*ci)->frames;
1142                 }
1143
1144                 /* figure out the name for this take */
1145
1146                 srcs.push_back (_write_source);
1147                 _write_source->set_timeline_position (capture_info.front()->start);
1148                 _write_source->set_captured_for (_name);
1149
1150                 string whole_file_region_name;
1151                 whole_file_region_name = region_name_from_path (_write_source->name(), true);
1152
1153                 /* Register a new region with the Session that
1154                    describes the entire source. Do this first
1155                    so that any sub-regions will obviously be
1156                    children of this one (later!)
1157                    */
1158
1159                 try {
1160                         boost::shared_ptr<Region> rx (RegionFactory::create (srcs, 0,
1161                                         total_capture, whole_file_region_name, 0,
1162                                         Region::Flag (Region::DefaultFlags|Region::Automatic|Region::WholeFile)));
1163
1164                         region = boost::dynamic_pointer_cast<MidiRegion> (rx);
1165                         region->special_set_position (capture_info.front()->start);
1166                 }
1167
1168
1169                 catch (failed_constructor& err) {
1170                         error << string_compose(_("%1: could not create region for complete midi file"), _name) << endmsg;
1171                         /* XXX what now? */
1172                 }
1173
1174                 _last_capture_regions.push_back (region);
1175
1176                 // cerr << _name << ": there are " << capture_info.size() << " capture_info records\n";
1177
1178                 XMLNode &before = _playlist->get_state();
1179                 _playlist->freeze ();
1180
1181                 for (buffer_position = 0, ci = capture_info.begin(); ci != capture_info.end(); ++ci) {
1182
1183                         string region_name;
1184
1185                         _session.region_name (region_name, _write_source->name(), false);
1186
1187                         // cerr << _name << ": based on ci of " << (*ci)->start << " for " << (*ci)->frames << " add a region\n";
1188
1189                         try {
1190                                 boost::shared_ptr<Region> rx (RegionFactory::create (srcs, buffer_position, (*ci)->frames, region_name));
1191                                 region = boost::dynamic_pointer_cast<MidiRegion> (rx);
1192                         }
1193
1194                         catch (failed_constructor& err) {
1195                                 error << _("MidiDiskstream: could not create region for captured midi!") << endmsg;
1196                                 continue; /* XXX is this OK? */
1197                         }
1198
1199                         region->GoingAway.connect (bind (mem_fun (*this, &Diskstream::remove_region_from_last_capture), boost::weak_ptr<Region>(region)));
1200
1201                         _last_capture_regions.push_back (region);
1202
1203                         // cerr << "add new region, buffer position = " << buffer_position << " @ " << (*ci)->start << endl;
1204
1205                         i_am_the_modifier++;
1206                         _playlist->add_region (region, (*ci)->start);
1207                         i_am_the_modifier--;
1208
1209                         buffer_position += (*ci)->frames;
1210                 }
1211
1212                 _playlist->thaw ();
1213                 XMLNode &after = _playlist->get_state();
1214                 _session.add_command (new MementoCommand<Playlist>(*_playlist, &before, &after));
1215
1216         }
1217
1218         mark_write_completed = true;
1219
1220         reset_write_sources (mark_write_completed);
1221
1222         for (ci = capture_info.begin(); ci != capture_info.end(); ++ci) {
1223                 delete *ci;
1224         }
1225
1226         capture_info.clear ();
1227         capture_start_frame = 0;
1228 }
1229
1230 void
1231 MidiDiskstream::transport_looped (nframes_t transport_frame)
1232 {
1233         if (was_recording) {
1234
1235                 // adjust the capture length knowing that the data will be recorded to disk
1236                 // only necessary after the first loop where we're recording
1237                 if (capture_info.size() == 0) {
1238                         capture_captured += _capture_offset;
1239
1240                         if (_alignment_style == ExistingMaterial) {
1241                                 capture_captured += _session.worst_output_latency();
1242                         } else {
1243                                 capture_captured += _roll_delay;
1244                         }
1245                 }
1246
1247                 finish_capture (true);
1248
1249                 // the next region will start recording via the normal mechanism
1250                 // we'll set the start position to the current transport pos
1251                 // no latency adjustment or capture offset needs to be made, as that already happened the first time
1252                 capture_start_frame = transport_frame;
1253                 first_recordable_frame = transport_frame; // mild lie
1254                 last_recordable_frame = max_frames;
1255                 was_recording = true;
1256         }
1257 }
1258
1259 void
1260 MidiDiskstream::finish_capture (bool /*rec_monitors_input*/)
1261 {
1262         was_recording = false;
1263
1264         if (capture_captured == 0) {
1265                 return;
1266         }
1267
1268         // Why must we destroy?
1269         assert(!destructive());
1270
1271         CaptureInfo* ci = new CaptureInfo;
1272
1273         ci->start  = capture_start_frame;
1274         ci->frames = capture_captured;
1275
1276         /* XXX theoretical race condition here. Need atomic exchange ?
1277            However, the circumstances when this is called right
1278            now (either on record-disable or transport_stopped)
1279            mean that no actual race exists. I think ...
1280            We now have a capture_info_lock, but it is only to be used
1281            to synchronize in the transport_stop and the capture info
1282            accessors, so that invalidation will not occur (both non-realtime).
1283         */
1284
1285         // cerr << "Finish capture, add new CI, " << ci->start << '+' << ci->frames << endl;
1286
1287         capture_info.push_back (ci);
1288         capture_captured = 0;
1289 }
1290
1291 void
1292 MidiDiskstream::set_record_enabled (bool yn)
1293 {
1294         if (!recordable() || !_session.record_enabling_legal()) {
1295                 return;
1296         }
1297
1298         assert(!destructive());
1299
1300         if (yn && _source_port == 0) {
1301
1302                 /* pick up connections not initiated *from* the IO object
1303                    we're associated with.
1304                 */
1305
1306                 get_input_sources ();
1307         }
1308
1309         /* yes, i know that this not proof against race conditions, but its
1310            good enough. i think.
1311         */
1312
1313         if (record_enabled() != yn) {
1314                 if (yn) {
1315                         engage_record_enable ();
1316                 } else {
1317                         disengage_record_enable ();
1318                 }
1319         }
1320 }
1321
1322 void
1323 MidiDiskstream::engage_record_enable ()
1324 {
1325     bool rolling = _session.transport_speed() != 0.0f;
1326
1327         g_atomic_int_set (&_record_enabled, 1);
1328
1329         if (_source_port && Config->get_monitoring_model() == HardwareMonitoring) {
1330                 _source_port->request_monitor_input (!(_session.config.get_auto_input() && rolling));
1331         }
1332
1333         // FIXME: Why is this necessary?  Isn't needed for AudioDiskstream...
1334         if (!_write_source)
1335                 use_new_write_source();
1336
1337         _write_source->mark_streaming_midi_write_started (_note_mode, _session.transport_frame());
1338
1339         RecordEnableChanged (); /* EMIT SIGNAL */
1340 }
1341
1342 void
1343 MidiDiskstream::disengage_record_enable ()
1344 {
1345         g_atomic_int_set (&_record_enabled, 0);
1346         if (_source_port && Config->get_monitoring_model() == HardwareMonitoring) {
1347                 if (_source_port) {
1348                         _source_port->request_monitor_input (false);
1349                 }
1350         }
1351
1352         RecordEnableChanged (); /* EMIT SIGNAL */
1353 }
1354
1355 XMLNode&
1356 MidiDiskstream::get_state ()
1357 {
1358         XMLNode* node = new XMLNode ("MidiDiskstream");
1359         char buf[64];
1360         LocaleGuard lg (X_("POSIX"));
1361
1362         snprintf (buf, sizeof(buf), "0x%x", _flags);
1363         node->add_property ("flags", buf);
1364
1365         node->add_property("channel-mode", enum_2_string(get_channel_mode()));
1366
1367         snprintf (buf, sizeof(buf), "0x%x", get_channel_mask());
1368         node->add_property("channel-mask", buf);
1369
1370         node->add_property ("playlist", _playlist->name());
1371
1372         snprintf (buf, sizeof(buf), "%f", _visible_speed);
1373         node->add_property ("speed", buf);
1374
1375         node->add_property("name", _name);
1376         id().print(buf, sizeof(buf));
1377         node->add_property("id", buf);
1378
1379         if (_write_source && _session.get_record_enabled()) {
1380
1381                 XMLNode* cs_child = new XMLNode (X_("CapturingSources"));
1382                 XMLNode* cs_grandchild;
1383
1384                 cs_grandchild = new XMLNode (X_("file"));
1385                 cs_grandchild->add_property (X_("path"), _write_source->path());
1386                 cs_child->add_child_nocopy (*cs_grandchild);
1387
1388                 /* store the location where capture will start */
1389
1390                 Location* pi;
1391
1392                 if (_session.config.get_punch_in() && ((pi = _session.locations()->auto_punch_location()) != 0)) {
1393                         snprintf (buf, sizeof (buf), "%" PRId64, pi->start());
1394                 } else {
1395                         snprintf (buf, sizeof (buf), "%" PRIu32, _session.transport_frame());
1396                 }
1397
1398                 cs_child->add_property (X_("at"), buf);
1399                 node->add_child_nocopy (*cs_child);
1400         }
1401
1402         if (_extra_xml) {
1403                 node->add_child_copy (*_extra_xml);
1404         }
1405
1406         return* node;
1407 }
1408
1409 int
1410 MidiDiskstream::set_state (const XMLNode& node)
1411 {
1412         const XMLProperty* prop;
1413         XMLNodeList nlist = node.children();
1414         XMLNodeIterator niter;
1415         uint32_t nchans = 1;
1416         XMLNode* capture_pending_node = 0;
1417         LocaleGuard lg (X_("POSIX"));
1418
1419         in_set_state = true;
1420
1421         for (niter = nlist.begin(); niter != nlist.end(); ++niter) {
1422                 /*if ((*niter)->name() == IO::state_node_name) {
1423                         deprecated_io_node = new XMLNode (**niter);
1424                 }*/
1425                 assert ((*niter)->name() != IO::state_node_name);
1426
1427                 if ((*niter)->name() == X_("CapturingSources")) {
1428                         capture_pending_node = *niter;
1429                 }
1430         }
1431
1432         /* prevent write sources from being created */
1433
1434         in_set_state = true;
1435
1436         if ((prop = node.property ("name")) != 0) {
1437                 _name = prop->value();
1438         }
1439
1440         if ((prop = node.property ("id")) != 0) {
1441                 _id = prop->value ();
1442         }
1443
1444         if ((prop = node.property ("flags")) != 0) {
1445                 _flags = Flag (string_2_enum (prop->value(), _flags));
1446         }
1447
1448         ChannelMode channel_mode = AllChannels;
1449         if ((prop = node.property ("channel-mode")) != 0) {
1450                 channel_mode = ChannelMode (string_2_enum(prop->value(), channel_mode));
1451         }
1452
1453         unsigned int channel_mask = 0xFFFF;
1454         if ((prop = node.property ("channel-mask")) != 0) {
1455                 sscanf (prop->value().c_str(), "0x%x", &channel_mask);
1456                 if (channel_mask & (~0xFFFF)) {
1457                         warning << _("MidiDiskstream: XML property channel-mask out of range") << endmsg;
1458                 }
1459         }
1460
1461         set_channel_mode(channel_mode, channel_mask);
1462
1463         if ((prop = node.property ("channels")) != 0) {
1464                 nchans = atoi (prop->value().c_str());
1465         }
1466
1467         if ((prop = node.property ("playlist")) == 0) {
1468                 return -1;
1469         }
1470
1471         {
1472                 bool had_playlist = (_playlist != 0);
1473
1474                 if (find_and_use_playlist (prop->value())) {
1475                         return -1;
1476                 }
1477
1478                 if (!had_playlist) {
1479                         _playlist->set_orig_diskstream_id (_id);
1480                 }
1481
1482                 if (capture_pending_node) {
1483                         use_pending_capture_data (*capture_pending_node);
1484                 }
1485
1486         }
1487
1488         if ((prop = node.property ("speed")) != 0) {
1489                 double sp = atof (prop->value().c_str());
1490
1491                 if (realtime_set_speed (sp, false)) {
1492                         non_realtime_set_speed ();
1493                 }
1494         }
1495
1496         in_set_state = false;
1497
1498         /* make sure this is clear before we do anything else */
1499
1500         // FIXME?
1501         //_capturing_source = 0;
1502
1503         /* write sources are handled when we handle the input set
1504            up of the IO that owns this DS (::non_realtime_input_change())
1505         */
1506
1507         in_set_state = false;
1508
1509         return 0;
1510 }
1511
1512 int
1513 MidiDiskstream::use_new_write_source (uint32_t n)
1514 {
1515         if (!recordable()) {
1516                 return 1;
1517         }
1518
1519         assert(n == 0);
1520
1521         if (_write_source) {
1522
1523                 if (_write_source->is_empty ()) {
1524                         _write_source->mark_for_remove ();
1525                         _write_source.reset();
1526                 } else {
1527                         _write_source.reset();
1528                 }
1529         }
1530
1531         try {
1532                 _write_source = boost::dynamic_pointer_cast<SMFSource>(_session.create_midi_source_for_session (*this));
1533                 if (!_write_source) {
1534                         throw failed_constructor();
1535                 }
1536         }
1537
1538         catch (failed_constructor &err) {
1539                 error << string_compose (_("%1:%2 new capture file not initialized correctly"), _name, n) << endmsg;
1540                 _write_source.reset();
1541                 return -1;
1542         }
1543
1544         _write_source->set_allow_remove_if_empty (true);
1545
1546         return 0;
1547 }
1548
1549 void
1550 MidiDiskstream::reset_write_sources (bool mark_write_complete, bool /*force*/)
1551 {
1552         if (!recordable()) {
1553                 return;
1554         }
1555
1556         if (_write_source && mark_write_complete) {
1557                 _write_source->mark_streaming_write_completed ();
1558         }
1559
1560         use_new_write_source (0);
1561
1562         if (record_enabled()) {
1563                 //_capturing_sources.push_back (_write_source);
1564         }
1565 }
1566
1567 int
1568 MidiDiskstream::rename_write_sources ()
1569 {
1570         if (_write_source != 0) {
1571                 _write_source->set_source_name (_name, destructive());
1572                 /* XXX what to do if this fails ? */
1573         }
1574         return 0;
1575 }
1576
1577 void
1578 MidiDiskstream::set_block_size (nframes_t /*nframes*/)
1579 {
1580 }
1581
1582 void
1583 MidiDiskstream::allocate_temporary_buffers ()
1584 {
1585 }
1586
1587 void
1588 MidiDiskstream::monitor_input (bool yn)
1589 {
1590         if (_source_port)
1591                 _source_port->ensure_monitor_input (yn);
1592 }
1593
1594 void
1595 MidiDiskstream::set_align_style_from_io ()
1596 {
1597         bool have_physical = false;
1598
1599         if (_io == 0) {
1600                 return;
1601         }
1602
1603         get_input_sources ();
1604
1605         if (_source_port && _source_port->flags() & JackPortIsPhysical) {
1606                 have_physical = true;
1607         }
1608
1609         if (have_physical) {
1610                 set_align_style (ExistingMaterial);
1611         } else {
1612                 set_align_style (CaptureTime);
1613         }
1614 }
1615
1616
1617 float
1618 MidiDiskstream::playback_buffer_load () const
1619 {
1620         return (float) ((double) _playback_buf->read_space()/
1621                         (double) _playback_buf->capacity());
1622 }
1623
1624 float
1625 MidiDiskstream::capture_buffer_load () const
1626 {
1627         return (float) ((double) _capture_buf->write_space()/
1628                         (double) _capture_buf->capacity());
1629 }
1630
1631 int
1632 MidiDiskstream::use_pending_capture_data (XMLNode& /*node*/)
1633 {
1634         return 0;
1635 }
1636
1637 /** Writes playback events in the given range to \a dst, translating time stamps
1638  * so that an event at \a start has time = 0
1639  */
1640 void
1641 MidiDiskstream::get_playback (MidiBuffer& dst, nframes_t start, nframes_t end)
1642 {
1643         dst.clear();
1644         assert(dst.size() == 0);
1645
1646         // Reverse.  ... We just don't do reverse, ok?  Back off.
1647         if (end <= start) {
1648                 return;
1649         }
1650
1651         // Check only events added this offset cycle
1652         MidiBuffer::iterator this_cycle_start = dst.end();
1653
1654         // Translates stamps to be relative to start
1655
1656         _playback_buf->read(dst, start, end);
1657 #if 0
1658         const size_t events_read = _playback_buf->read(dst, start, end);
1659         cout << _name << ": MDS events read = " << events_read
1660              << " start = " << start << " end = " << end
1661              << " readspace " << _playback_buf->read_space()
1662              << " writespace " << _playback_buf->write_space() << endl;
1663 #endif
1664
1665         gint32 frames_read = end - start;
1666         g_atomic_int_add(&_frames_read_from_ringbuffer, frames_read);
1667
1668         // Feed the data through the MidiStateTracker
1669         // If it detects a LoopEvent it will add necessary note offs
1670         if (_midi_state_tracker.track(this_cycle_start, dst.end())) {
1671                 _midi_state_tracker.resolve_notes(dst, end-start - 1);
1672         }
1673 }
1674